mirror of
https://mau.dev/maunium/synapse.git
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629 lines
24 KiB
Python
629 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(
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user_id, login_submission, create_non_existant_users=True
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)
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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):
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user, attributes = self.parse_cas_response(cas_response_body)
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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)
|