771 lines
28 KiB
Python
771 lines
28 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, StoreError, SynapseError
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from synapse.util.async import run_on_reactor
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from synapse.config.ldap import LDAPMode
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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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try:
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import ldap3
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except ImportError:
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ldap3 = None
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pass
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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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SESSION_EXPIRE_MS = 48 * 60 * 60 * 1000
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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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self.ldap_enabled = hs.config.ldap_enabled
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if self.ldap_enabled:
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if not ldap3:
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raise RuntimeError(
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'Missing ldap3 library. This is required for LDAP Authentication.'
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)
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self.ldap_mode = hs.config.ldap_mode
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self.ldap_uri = hs.config.ldap_uri
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self.ldap_start_tls = hs.config.ldap_start_tls
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self.ldap_base = hs.config.ldap_base
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self.ldap_filter = hs.config.ldap_filter
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self.ldap_attributes = hs.config.ldap_attributes
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if self.ldap_mode == LDAPMode.SEARCH:
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self.ldap_bind_dn = hs.config.ldap_bind_dn
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self.ldap_bind_password = hs.config.ldap_bind_password
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self.hs = hs # FIXME better possibility to access registrationHandler later?
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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, session_id) where authed is true if
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the client has successfully completed an auth flow. If it is true
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the first 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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session_id is the ID of this session, either passed in by the client
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or assigned by the call to check_auth
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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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(
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False, self._auth_dict_for_flows(flows, session),
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clientdict, session['id']
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)
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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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defer.returnValue((True, creds, clientdict, session['id']))
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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, session['id']))
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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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def get_session_id(self, clientdict):
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"""
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Gets the session ID for a client given the client dictionary
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Args:
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clientdict: The dictionary sent by the client in the request
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Returns:
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str|None: The string session ID the client sent. If the client did
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not send a session ID, returns None.
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"""
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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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if 'session' in authdict:
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sid = authdict['session']
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return sid
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def set_session_data(self, session_id, key, value):
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"""
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Store a key-value pair into the sessions data associated with this
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request. This data is stored server-side and cannot be modified by
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the client.
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Args:
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session_id (string): The ID of this session as returned from check_auth
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key (string): The key to store the data under
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value (any): The data to store
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"""
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sess = self._get_session_info(session_id)
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sess.setdefault('serverdict', {})[key] = value
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self._save_session(sess)
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def get_session_data(self, session_id, key, default=None):
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"""
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Retrieve data stored with set_session_data
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Args:
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session_id (string): The ID of this session as returned from check_auth
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key (string): The key to store the data under
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default (any): Value to return if the key has not been set
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"""
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sess = self._get_session_info(session_id)
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return sess.setdefault('serverdict', {}).get(key, default)
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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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if not (yield self._check_password(user_id, password)):
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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.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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if not (yield self._check_password(user_id, password)):
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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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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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@defer.inlineCallbacks
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def _check_password(self, user_id, password):
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"""
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Returns:
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True if the user_id successfully authenticated
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"""
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valid_ldap = yield self._check_ldap_password(user_id, password)
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if valid_ldap:
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defer.returnValue(True)
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valid_local_password = yield self._check_local_password(user_id, password)
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if valid_local_password:
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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_local_password(self, user_id, password):
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try:
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user_id, password_hash = yield self._find_user_id_and_pwd_hash(user_id)
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defer.returnValue(self.validate_hash(password, password_hash))
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except LoginError:
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defer.returnValue(False)
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@defer.inlineCallbacks
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def _check_ldap_password(self, user_id, password):
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""" Attempt to authenticate a user against an LDAP Server
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and register an account if none exists.
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Returns:
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True if authentication against LDAP was successful
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"""
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if not ldap3 or not self.ldap_enabled:
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defer.returnValue(False)
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if self.ldap_mode not in LDAPMode.LIST:
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raise RuntimeError(
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'Invalid ldap mode specified: {mode}'.format(
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mode=self.ldap_mode
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)
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)
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try:
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server = ldap3.Server(self.ldap_uri)
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logger.debug(
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"Attempting ldap connection with %s",
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self.ldap_uri
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)
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localpart = UserID.from_string(user_id).localpart
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if self.ldap_mode == LDAPMode.SIMPLE:
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# bind with the the local users ldap credentials
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bind_dn = "{prop}={value},{base}".format(
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prop=self.ldap_attributes['uid'],
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value=localpart,
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base=self.ldap_base
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)
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conn = ldap3.Connection(server, bind_dn, password)
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logger.debug(
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"Established ldap connection in simple mode: %s",
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conn
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)
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if self.ldap_start_tls:
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conn.start_tls()
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logger.debug(
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"Upgraded ldap connection in simple mode through StartTLS: %s",
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conn
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)
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conn.bind()
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elif self.ldap_mode == LDAPMode.SEARCH:
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# connect with preconfigured credentials and search for local user
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conn = ldap3.Connection(
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server,
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self.ldap_bind_dn,
|
|
self.ldap_bind_password
|
|
)
|
|
logger.debug(
|
|
"Established ldap connection in search mode: %s",
|
|
conn
|
|
)
|
|
|
|
if self.ldap_start_tls:
|
|
conn.start_tls()
|
|
logger.debug(
|
|
"Upgraded ldap connection in search mode through StartTLS: %s",
|
|
conn
|
|
)
|
|
|
|
conn.bind()
|
|
|
|
# find matching dn
|
|
query = "({prop}={value})".format(
|
|
prop=self.ldap_attributes['uid'],
|
|
value=localpart
|
|
)
|
|
if self.ldap_filter:
|
|
query = "(&{query}{filter})".format(
|
|
query=query,
|
|
filter=self.ldap_filter
|
|
)
|
|
logger.debug("ldap search filter: %s", query)
|
|
result = conn.search(self.ldap_base, query)
|
|
|
|
if result and len(conn.response) == 1:
|
|
# found exactly one result
|
|
user_dn = conn.response[0]['dn']
|
|
logger.debug('ldap search found dn: %s', user_dn)
|
|
|
|
# unbind and reconnect, rebind with found dn
|
|
conn.unbind()
|
|
conn = ldap3.Connection(
|
|
server,
|
|
user_dn,
|
|
password,
|
|
auto_bind=True
|
|
)
|
|
else:
|
|
# found 0 or > 1 results, abort!
|
|
logger.warn(
|
|
"ldap search returned unexpected (%d!=1) amount of results",
|
|
len(conn.response)
|
|
)
|
|
defer.returnValue(False)
|
|
|
|
logger.info(
|
|
"User authenticated against ldap server: %s",
|
|
conn
|
|
)
|
|
|
|
# check for existing account, if none exists, create one
|
|
if not (yield self.does_user_exist(user_id)):
|
|
# query user metadata for account creation
|
|
query = "({prop}={value})".format(
|
|
prop=self.ldap_attributes['uid'],
|
|
value=localpart
|
|
)
|
|
|
|
if self.ldap_mode == LDAPMode.SEARCH and self.ldap_filter:
|
|
query = "(&{filter}{user_filter})".format(
|
|
filter=query,
|
|
user_filter=self.ldap_filter
|
|
)
|
|
logger.debug("ldap registration filter: %s", query)
|
|
|
|
result = conn.search(
|
|
search_base=self.ldap_base,
|
|
search_filter=query,
|
|
attributes=[
|
|
self.ldap_attributes['name'],
|
|
self.ldap_attributes['mail']
|
|
]
|
|
)
|
|
|
|
if len(conn.response) == 1:
|
|
attrs = conn.response[0]['attributes']
|
|
mail = attrs[self.ldap_attributes['mail']][0]
|
|
name = attrs[self.ldap_attributes['name']][0]
|
|
|
|
# create account
|
|
registration_handler = self.hs.get_handlers().registration_handler
|
|
user_id, access_token = (
|
|
yield registration_handler.register(localpart=localpart)
|
|
)
|
|
|
|
# TODO: bind email, set displayname with data from ldap directory
|
|
|
|
logger.info(
|
|
"ldap registration successful: %d: %s (%s, %)",
|
|
user_id,
|
|
localpart,
|
|
name,
|
|
mail
|
|
)
|
|
else:
|
|
logger.warn(
|
|
"ldap registration failed: unexpected (%d!=1) amount of results",
|
|
len(result)
|
|
)
|
|
defer.returnValue(False)
|
|
|
|
defer.returnValue(True)
|
|
except ldap3.core.exceptions.LDAPException as e:
|
|
logger.warn("Error during ldap authentication: %s", e)
|
|
defer.returnValue(False)
|
|
|
|
@defer.inlineCallbacks
|
|
def issue_access_token(self, user_id):
|
|
access_token = self.generate_access_token(user_id)
|
|
yield self.store.add_access_token_to_user(user_id, access_token)
|
|
defer.returnValue(access_token)
|
|
|
|
@defer.inlineCallbacks
|
|
def issue_refresh_token(self, user_id):
|
|
refresh_token = self.generate_refresh_token(user_id)
|
|
yield self.store.add_refresh_token_to_user(user_id, refresh_token)
|
|
defer.returnValue(refresh_token)
|
|
|
|
def generate_access_token(self, user_id, extra_caveats=None):
|
|
extra_caveats = extra_caveats or []
|
|
macaroon = self._generate_base_macaroon(user_id)
|
|
macaroon.add_first_party_caveat("type = access")
|
|
now = self.hs.get_clock().time_msec()
|
|
expiry = now + (60 * 60 * 1000)
|
|
macaroon.add_first_party_caveat("time < %d" % (expiry,))
|
|
for caveat in extra_caveats:
|
|
macaroon.add_first_party_caveat(caveat)
|
|
return macaroon.serialize()
|
|
|
|
def generate_refresh_token(self, user_id):
|
|
m = self._generate_base_macaroon(user_id)
|
|
m.add_first_party_caveat("type = refresh")
|
|
# Important to add a nonce, because otherwise every refresh token for a
|
|
# user will be the same.
|
|
m.add_first_party_caveat("nonce = %s" % (
|
|
stringutils.random_string_with_symbols(16),
|
|
))
|
|
return m.serialize()
|
|
|
|
def generate_short_term_login_token(self, user_id, duration_in_ms=(2 * 60 * 1000)):
|
|
macaroon = self._generate_base_macaroon(user_id)
|
|
macaroon.add_first_party_caveat("type = login")
|
|
now = self.hs.get_clock().time_msec()
|
|
expiry = now + duration_in_ms
|
|
macaroon.add_first_party_caveat("time < %d" % (expiry,))
|
|
return macaroon.serialize()
|
|
|
|
def generate_delete_pusher_token(self, user_id):
|
|
macaroon = self._generate_base_macaroon(user_id)
|
|
macaroon.add_first_party_caveat("type = delete_pusher")
|
|
return macaroon.serialize()
|
|
|
|
def validate_short_term_login_token_and_get_user_id(self, login_token):
|
|
try:
|
|
macaroon = pymacaroons.Macaroon.deserialize(login_token)
|
|
auth_api = self.hs.get_auth()
|
|
auth_api.validate_macaroon(macaroon, "login", True)
|
|
return self.get_user_from_macaroon(macaroon)
|
|
except (pymacaroons.exceptions.MacaroonException, TypeError, ValueError):
|
|
raise AuthError(401, "Invalid token", errcode=Codes.UNKNOWN_TOKEN)
|
|
|
|
def _generate_base_macaroon(self, user_id):
|
|
macaroon = pymacaroons.Macaroon(
|
|
location=self.hs.config.server_name,
|
|
identifier="key",
|
|
key=self.hs.config.macaroon_secret_key)
|
|
macaroon.add_first_party_caveat("gen = 1")
|
|
macaroon.add_first_party_caveat("user_id = %s" % (user_id,))
|
|
return macaroon
|
|
|
|
def get_user_from_macaroon(self, macaroon):
|
|
user_prefix = "user_id = "
|
|
for caveat in macaroon.caveats:
|
|
if caveat.caveat_id.startswith(user_prefix):
|
|
return caveat.caveat_id[len(user_prefix):]
|
|
raise AuthError(
|
|
self.INVALID_TOKEN_HTTP_STATUS, "No user_id found in token",
|
|
errcode=Codes.UNKNOWN_TOKEN
|
|
)
|
|
|
|
@defer.inlineCallbacks
|
|
def set_password(self, user_id, newpassword, requester=None):
|
|
password_hash = self.hash(newpassword)
|
|
|
|
except_access_token_ids = [requester.access_token_id] if requester else []
|
|
|
|
try:
|
|
yield self.store.user_set_password_hash(user_id, password_hash)
|
|
except StoreError as e:
|
|
if e.code == 404:
|
|
raise SynapseError(404, "Unknown user", Codes.NOT_FOUND)
|
|
raise e
|
|
yield self.store.user_delete_access_tokens(
|
|
user_id, except_access_token_ids
|
|
)
|
|
yield self.hs.get_pusherpool().remove_pushers_by_user(
|
|
user_id, except_access_token_ids
|
|
)
|
|
|
|
@defer.inlineCallbacks
|
|
def add_threepid(self, user_id, medium, address, validated_at):
|
|
yield self.store.user_add_threepid(
|
|
user_id, medium, address, validated_at,
|
|
self.hs.get_clock().time_msec()
|
|
)
|
|
|
|
def _save_session(self, session):
|
|
# TODO: Persistent storage
|
|
logger.debug("Saving session %s", session)
|
|
session["last_used"] = self.hs.get_clock().time_msec()
|
|
self.sessions[session["id"]] = session
|
|
self._prune_sessions()
|
|
|
|
def _prune_sessions(self):
|
|
for sid, sess in self.sessions.items():
|
|
last_used = 0
|
|
if 'last_used' in sess:
|
|
last_used = sess['last_used']
|
|
now = self.hs.get_clock().time_msec()
|
|
if last_used < now - AuthHandler.SESSION_EXPIRE_MS:
|
|
del self.sessions[sid]
|
|
|
|
def hash(self, password):
|
|
"""Computes a secure hash of password.
|
|
|
|
Args:
|
|
password (str): Password to hash.
|
|
|
|
Returns:
|
|
Hashed password (str).
|
|
"""
|
|
return bcrypt.hashpw(password + self.hs.config.password_pepper,
|
|
bcrypt.gensalt(self.bcrypt_rounds))
|
|
|
|
def validate_hash(self, password, stored_hash):
|
|
"""Validates that self.hash(password) == stored_hash.
|
|
|
|
Args:
|
|
password (str): Password to hash.
|
|
stored_hash (str): Expected hash value.
|
|
|
|
Returns:
|
|
Whether self.hash(password) == stored_hash (bool).
|
|
"""
|
|
if stored_hash:
|
|
return bcrypt.hashpw(password + self.hs.config.password_pepper,
|
|
stored_hash.encode('utf-8')) == stored_hash
|
|
else:
|
|
return False
|