514 lines
20 KiB
Python
514 lines
20 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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from twisted.internet import defer
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from synapse.api.errors import SynapseError, LoginError, Codes
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from synapse.types import UserID
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from synapse.http.server import finish_request
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from synapse.http.servlet import parse_json_object_from_request
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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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import simplejson as json
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import urllib
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import urlparse
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import logging
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from saml2 import BINDING_HTTP_POST
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from saml2 import config
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from saml2.client import Saml2Client
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import xml.etree.ElementTree as ET
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from twisted.web.client import PartialDownloadError
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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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SAML2_TYPE = "m.login.saml2"
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CAS_TYPE = "m.login.cas"
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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.idp_redirect_url = hs.config.saml2_idp_redirect_url
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self.saml2_enabled = hs.config.saml2_enabled
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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.saml2_enabled:
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flows.append({"type": LoginRestServlet.SAML2_TYPE})
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if self.cas_enabled:
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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.saml2_enabled and (login_submission["type"] ==
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LoginRestServlet.SAML2_TYPE):
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relay_state = ""
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if "relay_state" in login_submission:
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relay_state = "&RelayState=" + urllib.quote(
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login_submission["relay_state"])
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result = {
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"uri": "%s%s" % (self.idp_redirect_url, relay_state)
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}
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defer.returnValue((200, result))
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elif 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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if 'medium' not in identifier or 'address' not in identifier:
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raise SynapseError(400, "Invalid thirdparty identifier")
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address = identifier['address']
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if identifier['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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identifier['medium'], address
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)
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if not user_id:
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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 = 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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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 SAML2RestServlet(ClientV1RestServlet):
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PATTERNS = client_path_patterns("/login/saml2", releases=())
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def __init__(self, hs):
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super(SAML2RestServlet, self).__init__(hs)
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self.sp_config = hs.config.saml2_config_path
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self.handlers = hs.get_handlers()
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@defer.inlineCallbacks
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def on_POST(self, request):
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saml2_auth = None
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try:
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conf = config.SPConfig()
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conf.load_file(self.sp_config)
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SP = Saml2Client(conf)
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saml2_auth = SP.parse_authn_request_response(
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request.args['SAMLResponse'][0], BINDING_HTTP_POST)
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except Exception as e: # Not authenticated
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logger.exception(e)
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if saml2_auth and saml2_auth.status_ok() and not saml2_auth.not_signed:
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username = saml2_auth.name_id.text
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handler = self.handlers.registration_handler
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(user_id, token) = yield handler.register_saml2(username)
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# Forward to the RelayState callback along with ava
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if 'RelayState' in request.args:
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request.redirect(urllib.unquote(
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request.args['RelayState'][0]) +
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'?status=authenticated&access_token=' +
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token + '&user_id=' + user_id + '&ava=' +
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urllib.quote(json.dumps(saml2_auth.ava)))
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finish_request(request)
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defer.returnValue(None)
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defer.returnValue((200, {"status": "authenticated",
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"user_id": user_id, "token": token,
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"ava": saml2_auth.ava}))
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elif 'RelayState' in request.args:
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request.redirect(urllib.unquote(
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request.args['RelayState'][0]) +
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'?status=not_authenticated')
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finish_request(request)
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defer.returnValue(None)
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defer.returnValue((200, {"status": "not_authenticated"}))
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class CasRedirectServlet(ClientV1RestServlet):
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PATTERNS = client_path_patterns("/login/cas/redirect", releases=())
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def __init__(self, hs):
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super(CasRedirectServlet, 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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def on_GET(self, request):
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args = request.args
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if "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.urlencode({
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"redirectUrl": args["redirectUrl"][0]
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})
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hs_redirect_url = self.cas_service_url + "/_matrix/client/api/v1/login/cas/ticket"
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service_param = urllib.urlencode({
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"service": "%s?%s" % (hs_redirect_url, client_redirect_url_param)
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})
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request.redirect("%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["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["ticket"],
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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(urlparse.urlparse(url))
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query = dict(urlparse.parse_qsl(url_parts[4]))
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query.update({"loginToken": token})
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url_parts[4] = urllib.urlencode(query)
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return urlparse.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:
|
|
# 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
|
|
|
|
|
|
def register_servlets(hs, http_server):
|
|
LoginRestServlet(hs).register(http_server)
|
|
if hs.config.saml2_enabled:
|
|
SAML2RestServlet(hs).register(http_server)
|
|
if hs.config.cas_enabled:
|
|
CasRedirectServlet(hs).register(http_server)
|
|
CasTicketServlet(hs).register(http_server)
|