481 lines
18 KiB
Python
481 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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from twisted.internet import defer
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from ._base import BaseHandler
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from synapse.api.constants import LoginType
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from synapse.types import UserID
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from synapse.api.errors import AuthError, LoginError, Codes
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from synapse.util.async import run_on_reactor
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from twisted.web.client import PartialDownloadError
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import logging
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import bcrypt
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import pymacaroons
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import simplejson
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import synapse.util.stringutils as stringutils
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logger = logging.getLogger(__name__)
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class AuthHandler(BaseHandler):
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def __init__(self, hs):
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super(AuthHandler, self).__init__(hs)
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self.checkers = {
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LoginType.PASSWORD: self._check_password_auth,
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LoginType.RECAPTCHA: self._check_recaptcha,
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LoginType.EMAIL_IDENTITY: self._check_email_identity,
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LoginType.DUMMY: self._check_dummy_auth,
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}
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self.bcrypt_rounds = hs.config.bcrypt_rounds
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self.sessions = {}
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self.INVALID_TOKEN_HTTP_STATUS = 401
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@defer.inlineCallbacks
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def check_auth(self, flows, clientdict, clientip):
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"""
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Takes a dictionary sent by the client in the login / registration
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protocol and handles the login flow.
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As a side effect, this function fills in the 'creds' key on the user's
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session with a map, which maps each auth-type (str) to the relevant
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identity authenticated by that auth-type (mostly str, but for captcha, bool).
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Args:
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flows (list): A list of login flows. Each flow is an ordered list of
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strings representing auth-types. At least one full
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flow must be completed in order for auth to be successful.
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clientdict: The dictionary from the client root level, not the
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'auth' key: this method prompts for auth if none is sent.
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clientip (str): The IP address of the client.
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Returns:
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A tuple of (authed, dict, dict) where authed is true if the client
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has successfully completed an auth flow. If it is true, the first
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dict contains the authenticated credentials of each stage.
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If authed is false, the first dictionary is the server response to
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the login request and should be passed back to the client.
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In either case, the second dict contains the parameters for this
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request (which may have been given only in a previous call).
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"""
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authdict = None
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sid = None
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if clientdict and 'auth' in clientdict:
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authdict = clientdict['auth']
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del clientdict['auth']
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if 'session' in authdict:
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sid = authdict['session']
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session = self._get_session_info(sid)
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if len(clientdict) > 0:
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# This was designed to allow the client to omit the parameters
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# and just supply the session in subsequent calls so it split
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# auth between devices by just sharing the session, (eg. so you
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# could continue registration from your phone having clicked the
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# email auth link on there). It's probably too open to abuse
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# because it lets unauthenticated clients store arbitrary objects
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# on a home server.
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# Revisit: Assumimg the REST APIs do sensible validation, the data
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# isn't arbintrary.
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session['clientdict'] = clientdict
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self._save_session(session)
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elif 'clientdict' in session:
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clientdict = session['clientdict']
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if not authdict:
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defer.returnValue(
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(False, self._auth_dict_for_flows(flows, session), clientdict)
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)
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if 'creds' not in session:
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session['creds'] = {}
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creds = session['creds']
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# check auth type currently being presented
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if 'type' in authdict:
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if authdict['type'] not in self.checkers:
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raise LoginError(400, "", Codes.UNRECOGNIZED)
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result = yield self.checkers[authdict['type']](authdict, clientip)
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if result:
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creds[authdict['type']] = result
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self._save_session(session)
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for f in flows:
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if len(set(f) - set(creds.keys())) == 0:
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logger.info("Auth completed with creds: %r", creds)
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self._remove_session(session)
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defer.returnValue((True, creds, clientdict))
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ret = self._auth_dict_for_flows(flows, session)
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ret['completed'] = creds.keys()
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defer.returnValue((False, ret, clientdict))
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@defer.inlineCallbacks
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def add_oob_auth(self, stagetype, authdict, clientip):
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"""
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Adds the result of out-of-band authentication into an existing auth
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session. Currently used for adding the result of fallback auth.
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"""
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if stagetype not in self.checkers:
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raise LoginError(400, "", Codes.MISSING_PARAM)
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if 'session' not in authdict:
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raise LoginError(400, "", Codes.MISSING_PARAM)
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sess = self._get_session_info(
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authdict['session']
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)
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if 'creds' not in sess:
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sess['creds'] = {}
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creds = sess['creds']
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result = yield self.checkers[stagetype](authdict, clientip)
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if result:
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creds[stagetype] = result
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self._save_session(sess)
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defer.returnValue(True)
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defer.returnValue(False)
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@defer.inlineCallbacks
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def _check_password_auth(self, authdict, _):
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if "user" not in authdict or "password" not in authdict:
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raise LoginError(400, "", Codes.MISSING_PARAM)
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user_id = authdict["user"]
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password = authdict["password"]
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if not user_id.startswith('@'):
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user_id = UserID.create(user_id, self.hs.hostname).to_string()
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user_id, password_hash = yield self._find_user_id_and_pwd_hash(user_id)
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self._check_password(user_id, password, password_hash)
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defer.returnValue(user_id)
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@defer.inlineCallbacks
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def _check_recaptcha(self, authdict, clientip):
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try:
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user_response = authdict["response"]
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except KeyError:
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# Client tried to provide captcha but didn't give the parameter:
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# bad request.
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raise LoginError(
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400, "Captcha response is required",
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errcode=Codes.CAPTCHA_NEEDED
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)
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logger.info(
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"Submitting recaptcha response %s with remoteip %s",
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user_response, clientip
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)
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# TODO: get this from the homeserver rather than creating a new one for
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# each request
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try:
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client = self.hs.get_simple_http_client()
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resp_body = yield client.post_urlencoded_get_json(
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self.hs.config.recaptcha_siteverify_api,
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args={
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'secret': self.hs.config.recaptcha_private_key,
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'response': user_response,
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'remoteip': clientip,
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}
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)
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except PartialDownloadError as pde:
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# Twisted is silly
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data = pde.response
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resp_body = simplejson.loads(data)
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if 'success' in resp_body and resp_body['success']:
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defer.returnValue(True)
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raise LoginError(401, "", errcode=Codes.UNAUTHORIZED)
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@defer.inlineCallbacks
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def _check_email_identity(self, authdict, _):
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yield run_on_reactor()
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if 'threepid_creds' not in authdict:
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raise LoginError(400, "Missing threepid_creds", Codes.MISSING_PARAM)
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threepid_creds = authdict['threepid_creds']
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identity_handler = self.hs.get_handlers().identity_handler
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logger.info("Getting validated threepid. threepidcreds: %r" % (threepid_creds,))
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threepid = yield identity_handler.threepid_from_creds(threepid_creds)
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if not threepid:
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raise LoginError(401, "", errcode=Codes.UNAUTHORIZED)
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threepid['threepid_creds'] = authdict['threepid_creds']
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defer.returnValue(threepid)
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@defer.inlineCallbacks
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def _check_dummy_auth(self, authdict, _):
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yield run_on_reactor()
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defer.returnValue(True)
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def _get_params_recaptcha(self):
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return {"public_key": self.hs.config.recaptcha_public_key}
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def _auth_dict_for_flows(self, flows, session):
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public_flows = []
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for f in flows:
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public_flows.append(f)
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get_params = {
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LoginType.RECAPTCHA: self._get_params_recaptcha,
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}
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params = {}
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for f in public_flows:
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for stage in f:
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if stage in get_params and stage not in params:
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params[stage] = get_params[stage]()
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return {
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"session": session['id'],
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"flows": [{"stages": f} for f in public_flows],
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"params": params
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}
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def _get_session_info(self, session_id):
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if session_id not in self.sessions:
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session_id = None
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if not session_id:
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# create a new session
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while session_id is None or session_id in self.sessions:
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session_id = stringutils.random_string(24)
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self.sessions[session_id] = {
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"id": session_id,
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}
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return self.sessions[session_id]
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@defer.inlineCallbacks
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def login_with_password(self, user_id, password):
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"""
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Authenticates the user with their username and password.
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Used only by the v1 login API.
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Args:
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user_id (str): User ID
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password (str): Password
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Returns:
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A tuple of:
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The user's ID.
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The access token for the user's session.
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The refresh token for the user's session.
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Raises:
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StoreError if there was a problem storing the token.
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LoginError if there was an authentication problem.
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"""
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user_id, password_hash = yield self._find_user_id_and_pwd_hash(user_id)
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self._check_password(user_id, password, password_hash)
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logger.info("Logging in user %s", user_id)
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access_token = yield self.issue_access_token(user_id)
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refresh_token = yield self.issue_refresh_token(user_id)
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defer.returnValue((user_id, access_token, refresh_token))
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@defer.inlineCallbacks
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def get_login_tuple_for_user_id(self, user_id):
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"""
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Gets login tuple for the user with the given user ID.
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The user is assumed to have been authenticated by some other
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machanism (e.g. CAS)
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Args:
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user_id (str): User ID
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Returns:
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A tuple of:
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The user's ID.
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The access token for the user's session.
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The refresh token for the user's session.
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Raises:
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StoreError if there was a problem storing the token.
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LoginError if there was an authentication problem.
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"""
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user_id, ignored = yield self._find_user_id_and_pwd_hash(user_id)
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logger.info("Logging in user %s", user_id)
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access_token = yield self.issue_access_token(user_id)
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refresh_token = yield self.issue_refresh_token(user_id)
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defer.returnValue((user_id, access_token, refresh_token))
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@defer.inlineCallbacks
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def does_user_exist(self, user_id):
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try:
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yield self._find_user_id_and_pwd_hash(user_id)
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defer.returnValue(True)
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except LoginError:
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defer.returnValue(False)
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@defer.inlineCallbacks
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def _find_user_id_and_pwd_hash(self, user_id):
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"""Checks to see if a user with the given id exists. Will check case
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insensitively, but will throw if there are multiple inexact matches.
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Returns:
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tuple: A 2-tuple of `(canonical_user_id, password_hash)`
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"""
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user_infos = yield self.store.get_users_by_id_case_insensitive(user_id)
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if not user_infos:
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logger.warn("Attempted to login as %s but they do not exist", user_id)
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raise LoginError(403, "", errcode=Codes.FORBIDDEN)
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if len(user_infos) > 1:
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if user_id not in user_infos:
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logger.warn(
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"Attempted to login as %s but it matches more than one user "
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"inexactly: %r",
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user_id, user_infos.keys()
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)
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raise LoginError(403, "", errcode=Codes.FORBIDDEN)
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defer.returnValue((user_id, user_infos[user_id]))
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else:
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defer.returnValue(user_infos.popitem())
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def _check_password(self, user_id, password, stored_hash):
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"""Checks that user_id has passed password, raises LoginError if not."""
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if not self.validate_hash(password, stored_hash):
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logger.warn("Failed password login for user %s", user_id)
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raise LoginError(403, "", errcode=Codes.FORBIDDEN)
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@defer.inlineCallbacks
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def issue_access_token(self, user_id):
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access_token = self.generate_access_token(user_id)
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yield self.store.add_access_token_to_user(user_id, access_token)
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defer.returnValue(access_token)
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@defer.inlineCallbacks
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def issue_refresh_token(self, user_id):
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refresh_token = self.generate_refresh_token(user_id)
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yield self.store.add_refresh_token_to_user(user_id, refresh_token)
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defer.returnValue(refresh_token)
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def generate_access_token(self, user_id, extra_caveats=None):
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extra_caveats = extra_caveats or []
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macaroon = self._generate_base_macaroon(user_id)
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macaroon.add_first_party_caveat("type = access")
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now = self.hs.get_clock().time_msec()
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expiry = now + (60 * 60 * 1000)
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macaroon.add_first_party_caveat("time < %d" % (expiry,))
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for caveat in extra_caveats:
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macaroon.add_first_party_caveat(caveat)
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return macaroon.serialize()
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def generate_refresh_token(self, user_id):
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m = self._generate_base_macaroon(user_id)
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m.add_first_party_caveat("type = refresh")
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# Important to add a nonce, because otherwise every refresh token for a
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# user will be the same.
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m.add_first_party_caveat("nonce = %s" % (
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stringutils.random_string_with_symbols(16),
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))
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return m.serialize()
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def generate_short_term_login_token(self, user_id):
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macaroon = self._generate_base_macaroon(user_id)
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macaroon.add_first_party_caveat("type = login")
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now = self.hs.get_clock().time_msec()
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expiry = now + (2 * 60 * 1000)
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macaroon.add_first_party_caveat("time < %d" % (expiry,))
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return macaroon.serialize()
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def validate_short_term_login_token_and_get_user_id(self, login_token):
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try:
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macaroon = pymacaroons.Macaroon.deserialize(login_token)
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auth_api = self.hs.get_auth()
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auth_api.validate_macaroon(macaroon, "login", True)
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return self.get_user_from_macaroon(macaroon)
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except (pymacaroons.exceptions.MacaroonException, TypeError, ValueError):
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raise AuthError(401, "Invalid token", errcode=Codes.UNKNOWN_TOKEN)
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def _generate_base_macaroon(self, user_id):
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macaroon = pymacaroons.Macaroon(
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location=self.hs.config.server_name,
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identifier="key",
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key=self.hs.config.macaroon_secret_key)
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macaroon.add_first_party_caveat("gen = 1")
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macaroon.add_first_party_caveat("user_id = %s" % (user_id,))
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return macaroon
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def get_user_from_macaroon(self, macaroon):
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user_prefix = "user_id = "
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for caveat in macaroon.caveats:
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if caveat.caveat_id.startswith(user_prefix):
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return caveat.caveat_id[len(user_prefix):]
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raise AuthError(
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self.INVALID_TOKEN_HTTP_STATUS, "No user_id found in token",
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errcode=Codes.UNKNOWN_TOKEN
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)
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@defer.inlineCallbacks
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def set_password(self, user_id, newpassword):
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password_hash = self.hash(newpassword)
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yield self.store.user_set_password_hash(user_id, password_hash)
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yield self.store.user_delete_access_tokens(user_id)
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yield self.hs.get_pusherpool().remove_pushers_by_user(user_id)
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yield self.store.flush_user(user_id)
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@defer.inlineCallbacks
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def add_threepid(self, user_id, medium, address, validated_at):
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yield self.store.user_add_threepid(
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user_id, medium, address, validated_at,
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self.hs.get_clock().time_msec()
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)
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def _save_session(self, session):
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# TODO: Persistent storage
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logger.debug("Saving session %s", session)
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self.sessions[session["id"]] = session
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def _remove_session(self, session):
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logger.debug("Removing session %s", session)
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del self.sessions[session["id"]]
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def hash(self, password):
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"""Computes a secure hash of password.
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Args:
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password (str): Password to hash.
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Returns:
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Hashed password (str).
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"""
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return bcrypt.hashpw(password, bcrypt.gensalt(self.bcrypt_rounds))
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def validate_hash(self, password, stored_hash):
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"""Validates that self.hash(password) == stored_hash.
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Args:
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password (str): Password to hash.
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stored_hash (str): Expected hash value.
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Returns:
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Whether self.hash(password) == stored_hash (bool).
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"""
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return bcrypt.checkpw(password, stored_hash)
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