mirror of
https://mau.dev/maunium/synapse.git
synced 2024-08-26 12:16:12 +00:00
b0c24a66ec
* Rip out half-implemented m.login.saml2 support This was implemented in an odd way that left most of the work to the client, in a way that I really didn't understand. It's going to be a pain to maintain, so let's start by ripping it out. * drop undocumented dependency on dateutil It turns out we were relying on dateutil being pulled in transitively by pysaml2. There's no need for that bloat.
460 lines
18 KiB
Python
460 lines
18 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.http.server import finish_request
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from synapse.http.servlet import RestServlet, parse_json_object_from_request
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from synapse.types import UserID
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from synapse.util.msisdn import phone_number_to_msisdn
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from .base import ClientV1RestServlet, client_path_patterns
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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"] = {
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"type": "m.id.user",
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"user": submission["user"],
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}
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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 {
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"type": "m.id.thirdparty",
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"medium": "msisdn",
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"address": msisdn,
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}
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class LoginRestServlet(ClientV1RestServlet):
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PATTERNS = client_path_patterns("/login$")
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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__(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.cas_enabled = hs.config.cas_enabled
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self.auth_handler = self.hs.get_auth_handler()
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self.device_handler = self.hs.get_device_handler()
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self.handlers = hs.get_handlers()
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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.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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login_submission = parse_json_object_from_request(request)
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try:
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if self.jwt_enabled and (login_submission["type"] ==
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LoginRestServlet.JWT_TYPE):
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result = yield self.do_jwt_login(login_submission)
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defer.returnValue(result)
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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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defer.returnValue(result)
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else:
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result = yield self._do_other_login(login_submission)
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defer.returnValue(result)
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except KeyError:
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raise SynapseError(400, "Missing JSON keys.")
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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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(int, object): HTTP code/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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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.warn(
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"unknown 3pid identifier medium %s, address %r",
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medium, address,
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)
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raise LoginError(403, "", errcode=Codes.FORBIDDEN)
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identifier = {
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"type": "m.id.user",
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"user": user_id,
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}
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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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auth_handler = self.auth_handler
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canonical_user_id, callback = yield auth_handler.validate_login(
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identifier["user"],
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login_submission,
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)
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device_id = yield self._register_device(
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canonical_user_id, login_submission,
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)
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access_token = yield auth_handler.get_access_token_for_user_id(
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canonical_user_id, device_id,
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)
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result = {
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"user_id": canonical_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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defer.returnValue((200, 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 = (
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yield auth_handler.validate_short_term_login_token_and_get_user_id(token)
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)
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device_id = yield self._register_device(user_id, login_submission)
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access_token = yield auth_handler.get_access_token_for_user_id(
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user_id, device_id,
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)
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result = {
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"user_id": user_id, # may have changed
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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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defer.returnValue((200, 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",
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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(token, self.jwt_secret, algorithms=[self.jwt_algorithm])
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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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auth_handler = self.auth_handler
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registered_user_id = yield auth_handler.check_user_exists(user_id)
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if registered_user_id:
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device_id = yield self._register_device(
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registered_user_id, login_submission
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)
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access_token = yield auth_handler.get_access_token_for_user_id(
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registered_user_id, device_id,
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)
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result = {
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"user_id": registered_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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else:
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# TODO: we should probably check that the register isn't going
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# to fonx/change our user_id before registering the device
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device_id = yield self._register_device(user_id, login_submission)
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user_id, access_token = (
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yield self.handlers.registration_handler.register(localpart=user)
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)
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result = {
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"user_id": user_id, # may have changed
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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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defer.returnValue((200, result))
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def _register_device(self, user_id, login_submission):
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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) login_submission: dictionary supplied to /login call, from
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which we pull 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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device_id = login_submission.get("device_id")
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initial_display_name = login_submission.get(
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"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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class CasRedirectServlet(RestServlet):
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PATTERNS = client_path_patterns("/login/(cas|sso)/redirect")
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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 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 CAS auth")
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client_redirect_url_param = urllib.parse.urlencode({
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b"redirectUrl": args[b"redirectUrl"][0]
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}).encode('ascii')
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hs_redirect_url = (self.cas_service_url +
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b"/_matrix/client/api/v1/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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request.redirect(b"%s/login?%s" % (self.cas_server_url, service_param))
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finish_request(request)
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class CasTicketServlet(ClientV1RestServlet):
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PATTERNS = client_path_patterns("/login/cas/ticket", releases=())
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def __init__(self, hs):
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super(CasTicketServlet, self).__init__(hs)
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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_required_attributes = hs.config.cas_required_attributes
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self.auth_handler = hs.get_auth_handler()
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self.handlers = hs.get_handlers()
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self.macaroon_gen = hs.get_macaroon_generator()
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@defer.inlineCallbacks
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def on_GET(self, request):
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client_redirect_url = request.args[b"redirectUrl"][0]
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http_client = self.hs.get_simple_http_client()
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uri = self.cas_server_url + "/proxyValidate"
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args = {
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"ticket": request.args[b"ticket"][0].decode('ascii'),
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"service": self.cas_service_url
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}
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try:
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body = yield 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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defer.returnValue(result)
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@defer.inlineCallbacks
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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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for required_attribute, required_value in self.cas_required_attributes.items():
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# If required attribute was not in CAS Response - Forbidden
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if required_attribute not in attributes:
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raise LoginError(401, "Unauthorized", errcode=Codes.UNAUTHORIZED)
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# Also need to check value
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if required_value is not None:
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actual_value = attributes[required_attribute]
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# If required attribute value does not match expected - Forbidden
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if required_value != actual_value:
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raise LoginError(401, "Unauthorized", errcode=Codes.UNAUTHORIZED)
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user_id = UserID(user, self.hs.hostname).to_string()
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auth_handler = self.auth_handler
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registered_user_id = yield auth_handler.check_user_exists(user_id)
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if not registered_user_id:
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registered_user_id, _ = (
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yield self.handlers.registration_handler.register(localpart=user)
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)
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login_token = self.macaroon_gen.generate_short_term_login_token(
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registered_user_id
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)
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redirect_url = self.add_login_token_to_redirect_url(client_redirect_url,
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login_token)
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request.redirect(redirect_url)
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finish_request(request)
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def add_login_token_to_redirect_url(self, url, token):
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url_parts = list(urllib.parse.urlparse(url))
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query = dict(urllib.parse.parse_qsl(url_parts[4]))
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query.update({"loginToken": token})
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url_parts[4] = urllib.parse.urlencode(query).encode('ascii')
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return urllib.parse.urlunparse(url_parts)
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def parse_cas_response(self, cas_response_body):
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user = None
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attributes = {}
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try:
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root = ET.fromstring(cas_response_body)
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if not root.tag.endswith("serviceResponse"):
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raise Exception("root of CAS response is not serviceResponse")
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success = (root[0].tag.endswith("authenticationSuccess"))
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for child in root[0]:
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if child.tag.endswith("user"):
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user = child.text
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if child.tag.endswith("attributes"):
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for attribute in child:
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# ElementTree library expands the namespace in
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# attribute tags to the full URL of the namespace.
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# We don't care about namespace here and it will always
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# be encased in curly braces, so we remove them.
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tag = attribute.tag
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if "}" in tag:
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tag = tag.split("}")[1]
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attributes[tag] = attribute.text
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if user is None:
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raise Exception("CAS response does not contain user")
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except Exception:
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logger.error("Error parsing CAS response", exc_info=1)
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raise LoginError(401, "Invalid CAS response",
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errcode=Codes.UNAUTHORIZED)
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if not success:
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raise LoginError(401, "Unsuccessful CAS response",
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errcode=Codes.UNAUTHORIZED)
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return user, attributes
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def register_servlets(hs, http_server):
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LoginRestServlet(hs).register(http_server)
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if hs.config.cas_enabled:
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CasRedirectServlet(hs).register(http_server)
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CasTicketServlet(hs).register(http_server)
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