mirror of
https://mau.dev/maunium/synapse.git
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184 lines
6.1 KiB
Python
184 lines
6.1 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2015 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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from twisted.internet import defer
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from synapse.api.constants import LoginType
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from synapse.api.errors import SynapseError, Codes
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from synapse.http.servlet import RestServlet
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from ._base import client_v2_pattern, parse_request_allow_empty
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import logging
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import hmac
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from hashlib import sha1
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from synapse.util.async import run_on_reactor
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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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compare_digest = lambda a, b: a == b
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logger = logging.getLogger(__name__)
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class RegisterRestServlet(RestServlet):
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PATTERN = client_v2_pattern("/register")
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def __init__(self, hs):
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super(RegisterRestServlet, self).__init__()
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self.hs = hs
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self.auth = hs.get_auth()
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self.auth_handler = hs.get_handlers().auth_handler
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self.registration_handler = hs.get_handlers().registration_handler
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self.identity_handler = hs.get_handlers().identity_handler
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self.login_handler = hs.get_handlers().login_handler
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@defer.inlineCallbacks
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def on_POST(self, request):
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yield run_on_reactor()
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body = parse_request_allow_empty(request)
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if 'password' not in body:
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raise SynapseError(400, "", Codes.MISSING_PARAM)
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if 'username' in body:
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desired_username = body['username']
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yield self.registration_handler.check_username(desired_username)
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is_using_shared_secret = False
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is_application_server = False
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service = None
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if 'access_token' in request.args:
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service = yield self.auth.get_appservice_by_req(request)
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if self.hs.config.enable_registration_captcha:
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flows = [
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[LoginType.RECAPTCHA],
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[LoginType.EMAIL_IDENTITY, LoginType.RECAPTCHA]
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]
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else:
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flows = [
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[LoginType.DUMMY],
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[LoginType.EMAIL_IDENTITY]
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]
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if service:
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is_application_server = True
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elif 'mac' in body:
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# Check registration-specific shared secret auth
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if 'username' not in body:
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raise SynapseError(400, "", Codes.MISSING_PARAM)
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self._check_shared_secret_auth(
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body['username'], body['mac']
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)
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is_using_shared_secret = True
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else:
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authed, result, params = yield self.auth_handler.check_auth(
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flows, body, self.hs.get_ip_from_request(request)
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)
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if not authed:
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defer.returnValue((401, result))
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can_register = (
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not self.hs.config.disable_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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if 'password' not in params:
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raise SynapseError(400, "", Codes.MISSING_PARAM)
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desired_username = params['username'] if 'username' in params else None
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new_password = params['password']
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(user_id, token) = yield self.registration_handler.register(
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localpart=desired_username,
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password=new_password
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)
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if LoginType.EMAIL_IDENTITY in result:
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threepid = result[LoginType.EMAIL_IDENTITY]
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for reqd in ['medium', 'address', 'validatedAt']:
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if reqd not in threepid:
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logger.info("Can't add incomplete 3pid")
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else:
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yield self.login_handler.add_threepid(
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user_id,
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threepid['medium'],
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threepid['address'],
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threepid['validatedAt'],
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)
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if 'bind_email' in params and params['bind_email']:
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logger.info("bind_email specified: binding")
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emailThreepid = result[LoginType.EMAIL_IDENTITY]
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threepid_creds = emailThreepid['threepid_creds']
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logger.debug("Binding emails %s to %s" % (
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emailThreepid, user_id
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))
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yield self.identity_handler.bind_threepid(threepid_creds, user_id)
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else:
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logger.info("bind_email not specified: not binding email")
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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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defer.returnValue((200, result))
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def on_OPTIONS(self, _):
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return 200, {}
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def _check_shared_secret_auth(self, username, mac):
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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 = username.encode("utf-8")
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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(mac)
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want_mac = hmac.new(
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key=self.hs.config.registration_shared_secret,
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msg=user,
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digestmod=sha1,
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).hexdigest()
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if compare_digest(want_mac, got_mac):
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return True
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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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def register_servlets(hs, http_server):
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RegisterRestServlet(hs).register(http_server)
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