mirror of
https://git.anonymousland.org/anonymousland/synapse-product.git
synced 2024-10-01 08:25:44 -04:00
541f1b92d9
We were doing this in a number of places which meant that some login code paths incremented the counter multiple times. It was also applying ratelimiting to UIA endpoints, which was probably not intentional. In particular, some custom auth modules were calling `check_user_exists`, which incremented the counters, meaning that people would fail to login sometimes.
627 lines
24 KiB
Python
627 lines
24 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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import logging
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import xml.etree.ElementTree as ET
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from six.moves import urllib
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from twisted.internet import defer
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from twisted.web.client import PartialDownloadError
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from synapse.api.errors import Codes, LoginError, SynapseError
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from synapse.api.ratelimiting import Ratelimiter
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from synapse.http.server import finish_request
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from synapse.http.servlet import (
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RestServlet,
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parse_json_object_from_request,
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parse_string,
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)
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from synapse.http.site import SynapseRequest
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from synapse.rest.client.v2_alpha._base import client_patterns
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from synapse.rest.well_known import WellKnownBuilder
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from synapse.types import UserID, map_username_to_mxid_localpart
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from synapse.util.msisdn import phone_number_to_msisdn
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logger = logging.getLogger(__name__)
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def login_submission_legacy_convert(submission):
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"""
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If the input login submission is an old style object
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(ie. with top-level user / medium / address) convert it
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to a typed object.
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"""
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if "user" in submission:
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submission["identifier"] = {"type": "m.id.user", "user": submission["user"]}
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del submission["user"]
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if "medium" in submission and "address" in submission:
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submission["identifier"] = {
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"type": "m.id.thirdparty",
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"medium": submission["medium"],
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"address": submission["address"],
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}
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del submission["medium"]
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del submission["address"]
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def login_id_thirdparty_from_phone(identifier):
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"""
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Convert a phone login identifier type to a generic threepid identifier
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Args:
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identifier(dict): Login identifier dict of type 'm.id.phone'
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Returns: Login identifier dict of type 'm.id.threepid'
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"""
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if "country" not in identifier or "number" not in identifier:
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raise SynapseError(400, "Invalid phone-type identifier")
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msisdn = phone_number_to_msisdn(identifier["country"], identifier["number"])
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return {"type": "m.id.thirdparty", "medium": "msisdn", "address": msisdn}
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class LoginRestServlet(RestServlet):
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PATTERNS = client_patterns("/login$", v1=True)
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CAS_TYPE = "m.login.cas"
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SSO_TYPE = "m.login.sso"
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TOKEN_TYPE = "m.login.token"
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JWT_TYPE = "m.login.jwt"
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def __init__(self, hs):
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super(LoginRestServlet, self).__init__()
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self.hs = hs
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self.jwt_enabled = hs.config.jwt_enabled
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self.jwt_secret = hs.config.jwt_secret
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self.jwt_algorithm = hs.config.jwt_algorithm
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self.saml2_enabled = hs.config.saml2_enabled
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self.cas_enabled = hs.config.cas_enabled
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self.auth_handler = self.hs.get_auth_handler()
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self.registration_handler = hs.get_registration_handler()
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self.handlers = hs.get_handlers()
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self._clock = hs.get_clock()
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self._well_known_builder = WellKnownBuilder(hs)
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self._address_ratelimiter = Ratelimiter()
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self._account_ratelimiter = Ratelimiter()
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self._failed_attempts_ratelimiter = Ratelimiter()
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def on_GET(self, request):
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flows = []
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if self.jwt_enabled:
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flows.append({"type": LoginRestServlet.JWT_TYPE})
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if self.saml2_enabled:
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flows.append({"type": LoginRestServlet.SSO_TYPE})
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flows.append({"type": LoginRestServlet.TOKEN_TYPE})
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if self.cas_enabled:
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flows.append({"type": LoginRestServlet.SSO_TYPE})
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# we advertise CAS for backwards compat, though MSC1721 renamed it
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# to SSO.
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flows.append({"type": LoginRestServlet.CAS_TYPE})
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# While its valid for us to advertise this login type generally,
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# synapse currently only gives out these tokens as part of the
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# CAS login flow.
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# Generally we don't want to advertise login flows that clients
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# don't know how to implement, since they (currently) will always
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# fall back to the fallback API if they don't understand one of the
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# login flow types returned.
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flows.append({"type": LoginRestServlet.TOKEN_TYPE})
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flows.extend(
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({"type": t} for t in self.auth_handler.get_supported_login_types())
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)
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return 200, {"flows": flows}
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def on_OPTIONS(self, request):
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return 200, {}
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@defer.inlineCallbacks
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def on_POST(self, request):
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self._address_ratelimiter.ratelimit(
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request.getClientIP(),
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time_now_s=self.hs.clock.time(),
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rate_hz=self.hs.config.rc_login_address.per_second,
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burst_count=self.hs.config.rc_login_address.burst_count,
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update=True,
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)
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login_submission = parse_json_object_from_request(request)
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try:
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if self.jwt_enabled and (
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login_submission["type"] == LoginRestServlet.JWT_TYPE
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):
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result = yield self.do_jwt_login(login_submission)
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elif login_submission["type"] == LoginRestServlet.TOKEN_TYPE:
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result = yield self.do_token_login(login_submission)
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else:
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result = yield self._do_other_login(login_submission)
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except KeyError:
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raise SynapseError(400, "Missing JSON keys.")
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well_known_data = self._well_known_builder.get_well_known()
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if well_known_data:
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result["well_known"] = well_known_data
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return 200, result
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@defer.inlineCallbacks
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def _do_other_login(self, login_submission):
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"""Handle non-token/saml/jwt logins
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Args:
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login_submission:
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Returns:
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dict: HTTP response
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"""
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# Log the request we got, but only certain fields to minimise the chance of
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# logging someone's password (even if they accidentally put it in the wrong
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# field)
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logger.info(
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"Got login request with identifier: %r, medium: %r, address: %r, user: %r",
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login_submission.get("identifier"),
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login_submission.get("medium"),
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login_submission.get("address"),
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login_submission.get("user"),
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)
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login_submission_legacy_convert(login_submission)
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if "identifier" not in login_submission:
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raise SynapseError(400, "Missing param: identifier")
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identifier = login_submission["identifier"]
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if "type" not in identifier:
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raise SynapseError(400, "Login identifier has no type")
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# convert phone type identifiers to generic threepids
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if identifier["type"] == "m.id.phone":
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identifier = login_id_thirdparty_from_phone(identifier)
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# convert threepid identifiers to user IDs
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if identifier["type"] == "m.id.thirdparty":
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address = identifier.get("address")
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medium = identifier.get("medium")
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if medium is None or address is None:
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raise SynapseError(400, "Invalid thirdparty identifier")
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if medium == "email":
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# For emails, transform the address to lowercase.
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# We store all email addreses as lowercase in the DB.
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# (See add_threepid in synapse/handlers/auth.py)
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address = address.lower()
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# We also apply account rate limiting using the 3PID as a key, as
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# otherwise using 3PID bypasses the ratelimiting based on user ID.
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self._failed_attempts_ratelimiter.ratelimit(
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(medium, address),
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time_now_s=self._clock.time(),
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rate_hz=self.hs.config.rc_login_failed_attempts.per_second,
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burst_count=self.hs.config.rc_login_failed_attempts.burst_count,
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update=False,
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)
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# Check for login providers that support 3pid login types
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(
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canonical_user_id,
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callback_3pid,
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) = yield self.auth_handler.check_password_provider_3pid(
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medium, address, login_submission["password"]
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)
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if canonical_user_id:
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# Authentication through password provider and 3pid succeeded
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result = yield self._complete_login(
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canonical_user_id, login_submission, callback_3pid
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)
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return result
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# No password providers were able to handle this 3pid
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# Check local store
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user_id = yield self.hs.get_datastore().get_user_id_by_threepid(
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medium, address
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)
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if not user_id:
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logger.warning(
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"unknown 3pid identifier medium %s, address %r", medium, address
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)
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# We mark that we've failed to log in here, as
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# `check_password_provider_3pid` might have returned `None` due
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# to an incorrect password, rather than the account not
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# existing.
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#
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# If it returned None but the 3PID was bound then we won't hit
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# this code path, which is fine as then the per-user ratelimit
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# will kick in below.
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self._failed_attempts_ratelimiter.can_do_action(
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(medium, address),
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time_now_s=self._clock.time(),
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rate_hz=self.hs.config.rc_login_failed_attempts.per_second,
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burst_count=self.hs.config.rc_login_failed_attempts.burst_count,
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update=True,
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)
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raise LoginError(403, "", errcode=Codes.FORBIDDEN)
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identifier = {"type": "m.id.user", "user": user_id}
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# by this point, the identifier should be an m.id.user: if it's anything
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# else, we haven't understood it.
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if identifier["type"] != "m.id.user":
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raise SynapseError(400, "Unknown login identifier type")
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if "user" not in identifier:
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raise SynapseError(400, "User identifier is missing 'user' key")
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if identifier["user"].startswith("@"):
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qualified_user_id = identifier["user"]
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else:
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qualified_user_id = UserID(identifier["user"], self.hs.hostname).to_string()
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# Check if we've hit the failed ratelimit (but don't update it)
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self._failed_attempts_ratelimiter.ratelimit(
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qualified_user_id.lower(),
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time_now_s=self._clock.time(),
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rate_hz=self.hs.config.rc_login_failed_attempts.per_second,
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burst_count=self.hs.config.rc_login_failed_attempts.burst_count,
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update=False,
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)
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try:
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canonical_user_id, callback = yield self.auth_handler.validate_login(
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identifier["user"], login_submission
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)
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except LoginError:
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# The user has failed to log in, so we need to update the rate
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# limiter. Using `can_do_action` avoids us raising a ratelimit
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# exception and masking the LoginError. The actual ratelimiting
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# should have happened above.
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self._failed_attempts_ratelimiter.can_do_action(
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qualified_user_id.lower(),
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time_now_s=self._clock.time(),
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rate_hz=self.hs.config.rc_login_failed_attempts.per_second,
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burst_count=self.hs.config.rc_login_failed_attempts.burst_count,
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update=True,
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)
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raise
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result = yield self._complete_login(
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canonical_user_id, login_submission, callback
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)
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return result
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@defer.inlineCallbacks
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def _complete_login(
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self, user_id, login_submission, callback=None, create_non_existant_users=False
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):
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"""Called when we've successfully authed the user and now need to
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actually login them in (e.g. create devices). This gets called on
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all succesful logins.
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Applies the ratelimiting for succesful login attempts against an
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account.
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Args:
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user_id (str): ID of the user to register.
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login_submission (dict): Dictionary of login information.
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callback (func|None): Callback function to run after registration.
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create_non_existant_users (bool): Whether to create the user if
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they don't exist. Defaults to False.
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Returns:
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result (Dict[str,str]): Dictionary of account information after
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successful registration.
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"""
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# Before we actually log them in we check if they've already logged in
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# too often. This happens here rather than before as we don't
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# necessarily know the user before now.
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self._account_ratelimiter.ratelimit(
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user_id.lower(),
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time_now_s=self._clock.time(),
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rate_hz=self.hs.config.rc_login_account.per_second,
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burst_count=self.hs.config.rc_login_account.burst_count,
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update=True,
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)
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if create_non_existant_users:
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user_id = yield self.auth_handler.check_user_exists(user_id)
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if not user_id:
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user_id = yield self.registration_handler.register_user(
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localpart=UserID.from_string(user_id).localpart
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)
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device_id = login_submission.get("device_id")
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initial_display_name = login_submission.get("initial_device_display_name")
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device_id, access_token = yield self.registration_handler.register_device(
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user_id, device_id, initial_display_name
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)
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result = {
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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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"device_id": device_id,
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}
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if callback is not None:
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yield callback(result)
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return result
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@defer.inlineCallbacks
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def do_token_login(self, login_submission):
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token = login_submission["token"]
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auth_handler = self.auth_handler
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user_id = yield auth_handler.validate_short_term_login_token_and_get_user_id(
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token
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)
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result = yield self._complete_login(user_id, login_submission)
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return result
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@defer.inlineCallbacks
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def do_jwt_login(self, login_submission):
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token = login_submission.get("token", None)
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if token is None:
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raise LoginError(
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401, "Token field for JWT is missing", errcode=Codes.UNAUTHORIZED
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)
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import jwt
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from jwt.exceptions import InvalidTokenError
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try:
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payload = jwt.decode(
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token, self.jwt_secret, algorithms=[self.jwt_algorithm]
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)
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except jwt.ExpiredSignatureError:
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raise LoginError(401, "JWT expired", errcode=Codes.UNAUTHORIZED)
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except InvalidTokenError:
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raise LoginError(401, "Invalid JWT", errcode=Codes.UNAUTHORIZED)
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user = payload.get("sub", None)
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if user is None:
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raise LoginError(401, "Invalid JWT", errcode=Codes.UNAUTHORIZED)
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user_id = UserID(user, self.hs.hostname).to_string()
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result = yield self._complete_login(user_id, login_submission)
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return result
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class BaseSSORedirectServlet(RestServlet):
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"""Common base class for /login/sso/redirect impls"""
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PATTERNS = client_patterns("/login/(cas|sso)/redirect", v1=True)
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def on_GET(self, request):
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args = request.args
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if b"redirectUrl" not in args:
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return 400, "Redirect URL not specified for SSO auth"
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client_redirect_url = args[b"redirectUrl"][0]
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sso_url = self.get_sso_url(client_redirect_url)
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request.redirect(sso_url)
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finish_request(request)
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def get_sso_url(self, client_redirect_url):
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"""Get the URL to redirect to, to perform SSO auth
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Args:
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client_redirect_url (bytes): the URL that we should redirect the
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client to when everything is done
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Returns:
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bytes: URL to redirect to
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"""
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# to be implemented by subclasses
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raise NotImplementedError()
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class CasRedirectServlet(BaseSSORedirectServlet):
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def __init__(self, hs):
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super(CasRedirectServlet, self).__init__()
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self.cas_server_url = hs.config.cas_server_url.encode("ascii")
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self.cas_service_url = hs.config.cas_service_url.encode("ascii")
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def get_sso_url(self, client_redirect_url):
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client_redirect_url_param = urllib.parse.urlencode(
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{b"redirectUrl": client_redirect_url}
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).encode("ascii")
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hs_redirect_url = self.cas_service_url + b"/_matrix/client/r0/login/cas/ticket"
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service_param = urllib.parse.urlencode(
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{b"service": b"%s?%s" % (hs_redirect_url, client_redirect_url_param)}
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).encode("ascii")
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return b"%s/login?%s" % (self.cas_server_url, service_param)
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class CasTicketServlet(RestServlet):
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PATTERNS = client_patterns("/login/cas/ticket", v1=True)
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def __init__(self, hs):
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super(CasTicketServlet, self).__init__()
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self.cas_server_url = hs.config.cas_server_url
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self.cas_service_url = hs.config.cas_service_url
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self.cas_displayname_attribute = hs.config.cas_displayname_attribute
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self.cas_required_attributes = hs.config.cas_required_attributes
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self._sso_auth_handler = SSOAuthHandler(hs)
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self._http_client = hs.get_proxied_http_client()
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@defer.inlineCallbacks
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def on_GET(self, request):
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client_redirect_url = parse_string(request, "redirectUrl", required=True)
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uri = self.cas_server_url + "/proxyValidate"
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args = {
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"ticket": parse_string(request, "ticket", required=True),
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"service": self.cas_service_url,
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}
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try:
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body = yield self._http_client.get_raw(uri, args)
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except PartialDownloadError as pde:
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# Twisted raises this error if the connection is closed,
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# even if that's being used old-http style to signal end-of-data
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body = pde.response
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result = yield self.handle_cas_response(request, body, client_redirect_url)
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return result
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def handle_cas_response(self, request, cas_response_body, client_redirect_url):
|
|
user, attributes = self.parse_cas_response(cas_response_body)
|
|
displayname = attributes.pop(self.cas_displayname_attribute, None)
|
|
|
|
for required_attribute, required_value in self.cas_required_attributes.items():
|
|
# If required attribute was not in CAS Response - Forbidden
|
|
if required_attribute not in attributes:
|
|
raise LoginError(401, "Unauthorized", errcode=Codes.UNAUTHORIZED)
|
|
|
|
# Also need to check value
|
|
if required_value is not None:
|
|
actual_value = attributes[required_attribute]
|
|
# If required attribute value does not match expected - Forbidden
|
|
if required_value != actual_value:
|
|
raise LoginError(401, "Unauthorized", errcode=Codes.UNAUTHORIZED)
|
|
|
|
return self._sso_auth_handler.on_successful_auth(
|
|
user, request, client_redirect_url, displayname
|
|
)
|
|
|
|
def parse_cas_response(self, cas_response_body):
|
|
user = None
|
|
attributes = {}
|
|
try:
|
|
root = ET.fromstring(cas_response_body)
|
|
if not root.tag.endswith("serviceResponse"):
|
|
raise Exception("root of CAS response is not serviceResponse")
|
|
success = root[0].tag.endswith("authenticationSuccess")
|
|
for child in root[0]:
|
|
if child.tag.endswith("user"):
|
|
user = child.text
|
|
if child.tag.endswith("attributes"):
|
|
for attribute in child:
|
|
# ElementTree library expands the namespace in
|
|
# attribute tags to the full URL of the namespace.
|
|
# We don't care about namespace here and it will always
|
|
# be encased in curly braces, so we remove them.
|
|
tag = attribute.tag
|
|
if "}" in tag:
|
|
tag = tag.split("}")[1]
|
|
attributes[tag] = attribute.text
|
|
if user is None:
|
|
raise Exception("CAS response does not contain user")
|
|
except Exception:
|
|
logger.error("Error parsing CAS response", exc_info=1)
|
|
raise LoginError(401, "Invalid CAS response", errcode=Codes.UNAUTHORIZED)
|
|
if not success:
|
|
raise LoginError(
|
|
401, "Unsuccessful CAS response", errcode=Codes.UNAUTHORIZED
|
|
)
|
|
return user, attributes
|
|
|
|
|
|
class SAMLRedirectServlet(BaseSSORedirectServlet):
|
|
PATTERNS = client_patterns("/login/sso/redirect", v1=True)
|
|
|
|
def __init__(self, hs):
|
|
self._saml_handler = hs.get_saml_handler()
|
|
|
|
def get_sso_url(self, client_redirect_url):
|
|
return self._saml_handler.handle_redirect_request(client_redirect_url)
|
|
|
|
|
|
class SSOAuthHandler(object):
|
|
"""
|
|
Utility class for Resources and Servlets which handle the response from a SSO
|
|
service
|
|
|
|
Args:
|
|
hs (synapse.server.HomeServer)
|
|
"""
|
|
|
|
def __init__(self, hs):
|
|
self._hostname = hs.hostname
|
|
self._auth_handler = hs.get_auth_handler()
|
|
self._registration_handler = hs.get_registration_handler()
|
|
self._macaroon_gen = hs.get_macaroon_generator()
|
|
|
|
@defer.inlineCallbacks
|
|
def on_successful_auth(
|
|
self, username, request, client_redirect_url, user_display_name=None
|
|
):
|
|
"""Called once the user has successfully authenticated with the SSO.
|
|
|
|
Registers the user if necessary, and then returns a redirect (with
|
|
a login token) to the client.
|
|
|
|
Args:
|
|
username (unicode|bytes): the remote user id. We'll map this onto
|
|
something sane for a MXID localpath.
|
|
|
|
request (SynapseRequest): the incoming request from the browser. We'll
|
|
respond to it with a redirect.
|
|
|
|
client_redirect_url (unicode): the redirect_url the client gave us when
|
|
it first started the process.
|
|
|
|
user_display_name (unicode|None): if set, and we have to register a new user,
|
|
we will set their displayname to this.
|
|
|
|
Returns:
|
|
Deferred[none]: Completes once we have handled the request.
|
|
"""
|
|
localpart = map_username_to_mxid_localpart(username)
|
|
user_id = UserID(localpart, self._hostname).to_string()
|
|
registered_user_id = yield self._auth_handler.check_user_exists(user_id)
|
|
if not registered_user_id:
|
|
registered_user_id = yield self._registration_handler.register_user(
|
|
localpart=localpart, default_display_name=user_display_name
|
|
)
|
|
|
|
self.complete_sso_login(registered_user_id, request, client_redirect_url)
|
|
|
|
def complete_sso_login(
|
|
self, registered_user_id: str, request: SynapseRequest, client_redirect_url: str
|
|
):
|
|
"""Having figured out a mxid for this user, complete the HTTP request
|
|
|
|
Args:
|
|
registered_user_id:
|
|
request:
|
|
client_redirect_url:
|
|
"""
|
|
|
|
login_token = self._macaroon_gen.generate_short_term_login_token(
|
|
registered_user_id
|
|
)
|
|
redirect_url = self._add_login_token_to_redirect_url(
|
|
client_redirect_url, login_token
|
|
)
|
|
request.redirect(redirect_url)
|
|
finish_request(request)
|
|
|
|
@staticmethod
|
|
def _add_login_token_to_redirect_url(url, token):
|
|
url_parts = list(urllib.parse.urlparse(url))
|
|
query = dict(urllib.parse.parse_qsl(url_parts[4]))
|
|
query.update({"loginToken": token})
|
|
url_parts[4] = urllib.parse.urlencode(query)
|
|
return urllib.parse.urlunparse(url_parts)
|
|
|
|
|
|
def register_servlets(hs, http_server):
|
|
LoginRestServlet(hs).register(http_server)
|
|
if hs.config.cas_enabled:
|
|
CasRedirectServlet(hs).register(http_server)
|
|
CasTicketServlet(hs).register(http_server)
|
|
elif hs.config.saml2_enabled:
|
|
SAMLRedirectServlet(hs).register(http_server)
|