446 lines
16 KiB
Python
446 lines
16 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2015 - 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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from twisted.internet import defer
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from synapse.api.auth import get_access_token_from_request, has_access_token
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from synapse.api.constants import LoginType
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from synapse.api.errors import SynapseError, Codes, UnrecognizedRequestError
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from synapse.http.servlet import RestServlet, parse_json_object_from_request
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from ._base import client_v2_patterns
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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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def compare_digest(a, b):
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return a == b
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logger = logging.getLogger(__name__)
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class RegisterRequestTokenRestServlet(RestServlet):
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PATTERNS = client_v2_patterns("/register/email/requestToken$")
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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(RegisterRequestTokenRestServlet, self).__init__()
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self.hs = hs
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self.identity_handler = hs.get_handlers().identity_handler
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@defer.inlineCallbacks
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def on_POST(self, request):
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body = parse_json_object_from_request(request)
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required = ['id_server', 'client_secret', 'email', 'send_attempt']
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absent = []
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for k in required:
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if k not in body:
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absent.append(k)
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if len(absent) > 0:
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raise SynapseError(400, "Missing params: %r" % absent, Codes.MISSING_PARAM)
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existingUid = yield self.hs.get_datastore().get_user_id_by_threepid(
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'email', body['email']
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)
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if existingUid is not None:
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raise SynapseError(400, "Email is already in use", Codes.THREEPID_IN_USE)
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ret = yield self.identity_handler.requestEmailToken(**body)
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defer.returnValue((200, ret))
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class RegisterRestServlet(RestServlet):
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PATTERNS = client_v2_patterns("/register$")
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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__()
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self.hs = hs
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self.auth = hs.get_auth()
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self.store = hs.get_datastore()
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self.auth_handler = hs.get_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.device_handler = hs.get_device_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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kind = "user"
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if "kind" in request.args:
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kind = request.args["kind"][0]
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if kind == "guest":
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ret = yield self._do_guest_registration()
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defer.returnValue(ret)
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return
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elif kind != "user":
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raise UnrecognizedRequestError(
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"Do not understand membership kind: %s" % (kind,)
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)
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body = parse_json_object_from_request(request)
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# we do basic sanity checks here because the auth layer will store these
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# in sessions. Pull out the username/password provided to us.
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desired_password = None
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if 'password' in body:
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if (not isinstance(body['password'], basestring) or
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len(body['password']) > 512):
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raise SynapseError(400, "Invalid password")
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desired_password = body["password"]
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desired_username = None
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if 'username' in body:
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if (not isinstance(body['username'], basestring) or
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len(body['username']) > 512):
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raise SynapseError(400, "Invalid username")
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desired_username = body['username']
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appservice = None
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if has_access_token(request):
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appservice = yield self.auth.get_appservice_by_req(request)
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# fork off as soon as possible for ASes and shared secret auth which
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# have completely different registration flows to normal users
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# == Application Service Registration ==
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if appservice:
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# Set the desired user according to the AS API (which uses the
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# 'user' key not 'username'). Since this is a new addition, we'll
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# fallback to 'username' if they gave one.
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desired_username = body.get("user", desired_username)
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access_token = get_access_token_from_request(request)
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if isinstance(desired_username, basestring):
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result = yield self._do_appservice_registration(
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desired_username, access_token, body
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)
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defer.returnValue((200, result)) # we throw for non 200 responses
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return
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# == Shared Secret Registration == (e.g. create new user scripts)
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if 'mac' in body:
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# FIXME: Should we really be determining if this is shared secret
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# auth based purely on the 'mac' key?
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result = yield self._do_shared_secret_registration(
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desired_username, desired_password, body
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)
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defer.returnValue((200, result)) # we throw for non 200 responses
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return
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# == Normal User Registration == (everyone else)
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if not self.hs.config.enable_registration:
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raise SynapseError(403, "Registration has been disabled")
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guest_access_token = body.get("guest_access_token", None)
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if (
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'initial_device_display_name' in body and
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'password' not in body
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):
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# ignore 'initial_device_display_name' if sent without
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# a password to work around a client bug where it sent
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# the 'initial_device_display_name' param alone, wiping out
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# the original registration params
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logger.warn("Ignoring initial_device_display_name without password")
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del body['initial_device_display_name']
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session_id = self.auth_handler.get_session_id(body)
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registered_user_id = None
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if session_id:
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# if we get a registered user id out of here, it means we previously
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# registered a user for this session, so we could just return the
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# user here. We carry on and go through the auth checks though,
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# for paranoia.
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registered_user_id = self.auth_handler.get_session_data(
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session_id, "registered_user_id", None
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)
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if desired_username is not None:
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yield self.registration_handler.check_username(
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desired_username,
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guest_access_token=guest_access_token,
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assigned_user_id=registered_user_id,
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)
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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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authed, auth_result, params, session_id = 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, auth_result))
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return
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if registered_user_id is not None:
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logger.info(
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"Already registered user ID %r for this session",
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registered_user_id
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)
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# don't re-register the email address
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add_email = False
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else:
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# NB: This may be from the auth handler and NOT from the POST
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if 'password' not in params:
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raise SynapseError(400, "Missing password.",
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Codes.MISSING_PARAM)
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desired_username = params.get("username", None)
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new_password = params.get("password", None)
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guest_access_token = params.get("guest_access_token", None)
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(registered_user_id, _) = yield self.registration_handler.register(
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localpart=desired_username,
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password=new_password,
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guest_access_token=guest_access_token,
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generate_token=False,
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)
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# remember that we've now registered that user account, and with
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# what user ID (since the user may not have specified)
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self.auth_handler.set_session_data(
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session_id, "registered_user_id", registered_user_id
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)
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add_email = True
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return_dict = yield self._create_registration_details(
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registered_user_id, params
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)
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if add_email and auth_result and LoginType.EMAIL_IDENTITY in auth_result:
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threepid = auth_result[LoginType.EMAIL_IDENTITY]
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yield self._register_email_threepid(
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registered_user_id, threepid, return_dict["access_token"],
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params.get("bind_email")
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)
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defer.returnValue((200, return_dict))
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def on_OPTIONS(self, _):
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return 200, {}
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@defer.inlineCallbacks
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def _do_appservice_registration(self, username, as_token, body):
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user_id = yield self.registration_handler.appservice_register(
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username, as_token
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)
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defer.returnValue((yield self._create_registration_details(user_id, body)))
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@defer.inlineCallbacks
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def _do_shared_secret_registration(self, username, password, body):
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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(body["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 not compare_digest(want_mac, got_mac):
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raise SynapseError(
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403, "HMAC incorrect",
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)
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(user_id, _) = yield self.registration_handler.register(
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localpart=username, password=password, generate_token=False,
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)
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result = yield self._create_registration_details(user_id, body)
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defer.returnValue(result)
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@defer.inlineCallbacks
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def _register_email_threepid(self, user_id, threepid, token, bind_email):
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"""Add an email address as a 3pid identifier
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Also adds an email pusher for the email address, if configured in the
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HS config
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Also optionally binds emails to the given user_id on the identity server
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Args:
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user_id (str): id of user
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threepid (object): m.login.email.identity auth response
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token (str): access_token for the user
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bind_email (bool): true if the client requested the email to be
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bound at the identity server
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Returns:
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defer.Deferred:
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"""
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reqd = ('medium', 'address', 'validated_at')
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if any(x not in threepid for x in reqd):
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logger.info("Can't add incomplete 3pid")
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defer.returnValue()
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yield self.auth_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['validated_at'],
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)
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# And we add an email pusher for them by default, but only
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# if email notifications are enabled (so people don't start
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# getting mail spam where they weren't before if email
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# notifs are set up on a home server)
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if (self.hs.config.email_enable_notifs and
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self.hs.config.email_notif_for_new_users):
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# Pull the ID of the access token back out of the db
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# It would really make more sense for this to be passed
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# up when the access token is saved, but that's quite an
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# invasive change I'd rather do separately.
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user_tuple = yield self.store.get_user_by_access_token(
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token
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)
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token_id = user_tuple["token_id"]
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yield self.hs.get_pusherpool().add_pusher(
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user_id=user_id,
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access_token=token_id,
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kind="email",
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app_id="m.email",
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app_display_name="Email Notifications",
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device_display_name=threepid["address"],
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pushkey=threepid["address"],
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lang=None, # We don't know a user's language here
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data={},
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)
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if bind_email:
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logger.info("bind_email specified: binding")
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logger.debug("Binding emails %s to %s" % (
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threepid, user_id
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))
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yield self.identity_handler.bind_threepid(
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threepid['threepid_creds'], user_id
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)
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else:
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logger.info("bind_email not specified: not binding email")
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@defer.inlineCallbacks
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def _create_registration_details(self, user_id, params):
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"""Complete registration of newly-registered user
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Allocates device_id if one was not given; also creates access_token
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and refresh_token.
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Args:
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(str) user_id: full canonical @user:id
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(object) params: registration parameters, from which we pull
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device_id and initial_device_name
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Returns:
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defer.Deferred: (object) dictionary for response from /register
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"""
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device_id = yield self._register_device(user_id, params)
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access_token, refresh_token = (
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yield self.auth_handler.get_login_tuple_for_user_id(
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user_id, device_id=device_id,
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initial_display_name=params.get("initial_device_display_name")
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)
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)
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defer.returnValue({
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"user_id": user_id,
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"access_token": access_token,
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"home_server": self.hs.hostname,
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"refresh_token": refresh_token,
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"device_id": device_id,
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})
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def _register_device(self, user_id, params):
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"""Register a device for a user.
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This is called after the user's credentials have been validated, but
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before the access token has been issued.
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Args:
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(str) user_id: full canonical @user:id
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(object) params: registration parameters, from which we pull
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device_id and initial_device_name
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Returns:
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defer.Deferred: (str) device_id
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"""
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# register the user's device
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device_id = params.get("device_id")
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initial_display_name = params.get("initial_device_display_name")
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return self.device_handler.check_device_registered(
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user_id, device_id, initial_display_name
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)
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@defer.inlineCallbacks
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def _do_guest_registration(self):
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if not self.hs.config.allow_guest_access:
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defer.returnValue((403, "Guest access is disabled"))
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user_id, _ = yield self.registration_handler.register(
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generate_token=False,
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make_guest=True
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)
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access_token = self.auth_handler.generate_access_token(
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user_id, ["guest = true"]
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)
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# XXX the "guest" caveat is not copied by /tokenrefresh. That's ok
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# so long as we don't return a refresh_token here.
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defer.returnValue((200, {
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"user_id": user_id,
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"access_token": access_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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RegisterRequestTokenRestServlet(hs).register(http_server)
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RegisterRestServlet(hs).register(http_server)
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