diff options
Diffstat (limited to 'synapse/handlers/auth.py')
| -rw-r--r-- | synapse/handlers/auth.py | 490 |
1 files changed, 349 insertions, 141 deletions
diff --git a/synapse/handlers/auth.py b/synapse/handlers/auth.py index fffba34383..a5365c4fe4 100644 --- a/synapse/handlers/auth.py +++ b/synapse/handlers/auth.py @@ -1,5 +1,6 @@ # -*- coding: utf-8 -*- # Copyright 2014 - 2016 OpenMarket Ltd +# Copyright 2017 Vector Creations Ltd # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. @@ -12,14 +13,19 @@ # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. - -from twisted.internet import defer +from twisted.internet import defer, threads from ._base import BaseHandler from synapse.api.constants import LoginType +from synapse.api.errors import ( + AuthError, Codes, InteractiveAuthIncompleteError, LoginError, StoreError, + SynapseError, +) +from synapse.module_api import ModuleApi from synapse.types import UserID -from synapse.api.errors import AuthError, LoginError, Codes, StoreError, SynapseError from synapse.util.async import run_on_reactor +from synapse.util.caches.expiringcache import ExpiringCache +from synapse.util.logcontext import make_deferred_yieldable from twisted.web.client import PartialDownloadError @@ -44,18 +50,23 @@ class AuthHandler(BaseHandler): """ super(AuthHandler, self).__init__(hs) self.checkers = { - LoginType.PASSWORD: self._check_password_auth, LoginType.RECAPTCHA: self._check_recaptcha, LoginType.EMAIL_IDENTITY: self._check_email_identity, + LoginType.MSISDN: self._check_msisdn, LoginType.DUMMY: self._check_dummy_auth, } self.bcrypt_rounds = hs.config.bcrypt_rounds - self.sessions = {} - account_handler = _AccountHandler( - hs, check_user_exists=self.check_user_exists + # This is not a cache per se, but a store of all current sessions that + # expire after N hours + self.sessions = ExpiringCache( + cache_name="register_sessions", + clock=hs.get_clock(), + expiry_ms=self.SESSION_EXPIRE_MS, + reset_expiry_on_get=True, ) + account_handler = ModuleApi(hs, self) self.password_providers = [ module(config=config, account_handler=account_handler) for module, config in hs.config.password_providers @@ -64,39 +75,120 @@ class AuthHandler(BaseHandler): logger.info("Extra password_providers: %r", self.password_providers) self.hs = hs # FIXME better possibility to access registrationHandler later? - self.device_handler = hs.get_device_handler() self.macaroon_gen = hs.get_macaroon_generator() + self._password_enabled = hs.config.password_enabled + + # we keep this as a list despite the O(N^2) implication so that we can + # keep PASSWORD first and avoid confusing clients which pick the first + # type in the list. (NB that the spec doesn't require us to do so and + # clients which favour types that they don't understand over those that + # they do are technically broken) + login_types = [] + if self._password_enabled: + login_types.append(LoginType.PASSWORD) + for provider in self.password_providers: + if hasattr(provider, "get_supported_login_types"): + for t in provider.get_supported_login_types().keys(): + if t not in login_types: + login_types.append(t) + self._supported_login_types = login_types + + @defer.inlineCallbacks + def validate_user_via_ui_auth(self, requester, request_body, clientip): + """ + Checks that the user is who they claim to be, via a UI auth. + + This is used for things like device deletion and password reset where + the user already has a valid access token, but we want to double-check + that it isn't stolen by re-authenticating them. + + Args: + requester (Requester): The user, as given by the access token + + request_body (dict): The body of the request sent by the client + + clientip (str): The IP address of the client. + + Returns: + defer.Deferred[dict]: the parameters for this request (which may + have been given only in a previous call). + + Raises: + InteractiveAuthIncompleteError if the client has not yet completed + any of the permitted login flows + + AuthError if the client has completed a login flow, and it gives + a different user to `requester` + """ + + # build a list of supported flows + flows = [ + [login_type] for login_type in self._supported_login_types + ] + + result, params, _ = yield self.check_auth( + flows, request_body, clientip, + ) + + # find the completed login type + for login_type in self._supported_login_types: + if login_type not in result: + continue + + user_id = result[login_type] + break + else: + # this can't happen + raise Exception( + "check_auth returned True but no successful login type", + ) + + # check that the UI auth matched the access token + if user_id != requester.user.to_string(): + raise AuthError(403, "Invalid auth") + + defer.returnValue(params) @defer.inlineCallbacks def check_auth(self, flows, clientdict, clientip): """ Takes a dictionary sent by the client in the login / registration - protocol and handles the login flow. + protocol and handles the User-Interactive Auth flow. As a side effect, this function fills in the 'creds' key on the user's session with a map, which maps each auth-type (str) to the relevant identity authenticated by that auth-type (mostly str, but for captcha, bool). + If no auth flows have been completed successfully, raises an + InteractiveAuthIncompleteError. To handle this, you can use + synapse.rest.client.v2_alpha._base.interactive_auth_handler as a + decorator. + Args: flows (list): A list of login flows. Each flow is an ordered list of strings representing auth-types. At least one full flow must be completed in order for auth to be successful. + clientdict: The dictionary from the client root level, not the 'auth' key: this method prompts for auth if none is sent. + clientip (str): The IP address of the client. + Returns: - A tuple of (authed, dict, dict, session_id) where authed is true if - the client has successfully completed an auth flow. If it is true - the first dict contains the authenticated credentials of each stage. + defer.Deferred[dict, dict, str]: a deferred tuple of + (creds, params, session_id). + + 'creds' contains the authenticated credentials of each stage. - If authed is false, the first dictionary is the server response to - the login request and should be passed back to the client. + 'params' contains the parameters for this request (which may + have been given only in a previous call). - In either case, the second dict contains the parameters for this - request (which may have been given only in a previous call). + 'session_id' is the ID of this session, either passed in by the + client or assigned by this call - session_id is the ID of this session, either passed in by the client - or assigned by the call to check_auth + Raises: + InteractiveAuthIncompleteError if the client has not yet completed + all the stages in any of the permitted flows. """ authdict = None @@ -124,11 +216,8 @@ class AuthHandler(BaseHandler): clientdict = session['clientdict'] if not authdict: - defer.returnValue( - ( - False, self._auth_dict_for_flows(flows, session), - clientdict, session['id'] - ) + raise InteractiveAuthIncompleteError( + self._auth_dict_for_flows(flows, session), ) if 'creds' not in session: @@ -139,14 +228,12 @@ class AuthHandler(BaseHandler): errordict = {} if 'type' in authdict: login_type = authdict['type'] - if login_type not in self.checkers: - raise LoginError(400, "", Codes.UNRECOGNIZED) try: - result = yield self.checkers[login_type](authdict, clientip) + result = yield self._check_auth_dict(authdict, clientip) if result: creds[login_type] = result self._save_session(session) - except LoginError, e: + except LoginError as e: if login_type == LoginType.EMAIL_IDENTITY: # riot used to have a bug where it would request a new # validation token (thus sending a new email) each time it @@ -155,7 +242,7 @@ class AuthHandler(BaseHandler): # # Grandfather in the old behaviour for now to avoid # breaking old riot deployments. - raise e + raise # this step failed. Merge the error dict into the response # so that the client can have another go. @@ -172,12 +259,14 @@ class AuthHandler(BaseHandler): "Auth completed with creds: %r. Client dict has keys: %r", creds, clientdict.keys() ) - defer.returnValue((True, creds, clientdict, session['id'])) + defer.returnValue((creds, clientdict, session['id'])) ret = self._auth_dict_for_flows(flows, session) ret['completed'] = creds.keys() ret.update(errordict) - defer.returnValue((False, ret, clientdict, session['id'])) + raise InteractiveAuthIncompleteError( + ret, + ) @defer.inlineCallbacks def add_oob_auth(self, stagetype, authdict, clientip): @@ -249,16 +338,37 @@ class AuthHandler(BaseHandler): sess = self._get_session_info(session_id) return sess.setdefault('serverdict', {}).get(key, default) - def _check_password_auth(self, authdict, _): - if "user" not in authdict or "password" not in authdict: - raise LoginError(400, "", Codes.MISSING_PARAM) + @defer.inlineCallbacks + def _check_auth_dict(self, authdict, clientip): + """Attempt to validate the auth dict provided by a client - user_id = authdict["user"] - password = authdict["password"] - if not user_id.startswith('@'): - user_id = UserID.create(user_id, self.hs.hostname).to_string() + Args: + authdict (object): auth dict provided by the client + clientip (str): IP address of the client - return self._check_password(user_id, password) + Returns: + Deferred: result of the stage verification. + + Raises: + StoreError if there was a problem accessing the database + SynapseError if there was a problem with the request + LoginError if there was an authentication problem. + """ + login_type = authdict['type'] + checker = self.checkers.get(login_type) + if checker is not None: + res = yield checker(authdict, clientip) + defer.returnValue(res) + + # build a v1-login-style dict out of the authdict and fall back to the + # v1 code + user_id = authdict.get("user") + + if user_id is None: + raise SynapseError(400, "", Codes.MISSING_PARAM) + + (canonical_id, callback) = yield self.validate_login(user_id, authdict) + defer.returnValue(canonical_id) @defer.inlineCallbacks def _check_recaptcha(self, authdict, clientip): @@ -307,31 +417,47 @@ class AuthHandler(BaseHandler): defer.returnValue(True) raise LoginError(401, "", errcode=Codes.UNAUTHORIZED) - @defer.inlineCallbacks def _check_email_identity(self, authdict, _): + return self._check_threepid('email', authdict) + + def _check_msisdn(self, authdict, _): + return self._check_threepid('msisdn', authdict) + + @defer.inlineCallbacks + def _check_dummy_auth(self, authdict, _): + yield run_on_reactor() + defer.returnValue(True) + + @defer.inlineCallbacks + def _check_threepid(self, medium, authdict): yield run_on_reactor() if 'threepid_creds' not in authdict: raise LoginError(400, "Missing threepid_creds", Codes.MISSING_PARAM) threepid_creds = authdict['threepid_creds'] + identity_handler = self.hs.get_handlers().identity_handler - logger.info("Getting validated threepid. threepidcreds: %r" % (threepid_creds,)) + logger.info("Getting validated threepid. threepidcreds: %r", (threepid_creds,)) threepid = yield identity_handler.threepid_from_creds(threepid_creds) if not threepid: raise LoginError(401, "", errcode=Codes.UNAUTHORIZED) + if threepid['medium'] != medium: + raise LoginError( + 401, + "Expecting threepid of type '%s', got '%s'" % ( + medium, threepid['medium'], + ), + errcode=Codes.UNAUTHORIZED + ) + threepid['threepid_creds'] = authdict['threepid_creds'] defer.returnValue(threepid) - @defer.inlineCallbacks - def _check_dummy_auth(self, authdict, _): - yield run_on_reactor() - defer.returnValue(True) - def _get_params_recaptcha(self): return {"public_key": self.hs.config.recaptcha_public_key} @@ -371,26 +497,8 @@ class AuthHandler(BaseHandler): return self.sessions[session_id] - def validate_password_login(self, user_id, password): - """ - Authenticates the user with their username and password. - - Used only by the v1 login API. - - Args: - user_id (str): complete @user:id - password (str): Password - Returns: - defer.Deferred: (str) canonical user id - Raises: - StoreError if there was a problem accessing the database - LoginError if there was an authentication problem. - """ - return self._check_password(user_id, password) - @defer.inlineCallbacks - def get_access_token_for_user_id(self, user_id, device_id=None, - initial_display_name=None): + def get_access_token_for_user_id(self, user_id, device_id=None): """ Creates a new access token for the user with the given user ID. @@ -404,13 +512,10 @@ class AuthHandler(BaseHandler): device_id (str|None): the device ID to associate with the tokens. None to leave the tokens unassociated with a device (deprecated: we should always have a device ID) - initial_display_name (str): display name to associate with the - device if it needs re-registering Returns: The access token for the user's session. Raises: StoreError if there was a problem storing the token. - LoginError if there was an authentication problem. """ logger.info("Logging in user %s on device %s", user_id, device_id) access_token = yield self.issue_access_token(user_id, device_id) @@ -420,9 +525,11 @@ class AuthHandler(BaseHandler): # really don't want is active access_tokens without a record of the # device, so we double-check it here. if device_id is not None: - yield self.device_handler.check_device_registered( - user_id, device_id, initial_display_name - ) + try: + yield self.store.get_device(user_id, device_id) + except StoreError: + yield self.store.delete_access_token(access_token) + raise StoreError(400, "Login raced against device deletion") defer.returnValue(access_token) @@ -474,29 +581,115 @@ class AuthHandler(BaseHandler): ) defer.returnValue(result) + def get_supported_login_types(self): + """Get a the login types supported for the /login API + + By default this is just 'm.login.password' (unless password_enabled is + False in the config file), but password auth providers can provide + other login types. + + Returns: + Iterable[str]: login types + """ + return self._supported_login_types + @defer.inlineCallbacks - def _check_password(self, user_id, password): - """Authenticate a user against the LDAP and local databases. + def validate_login(self, username, login_submission): + """Authenticates the user for the /login API - user_id is checked case insensitively against the local database, but - will throw if there are multiple inexact matches. + Also used by the user-interactive auth flow to validate + m.login.password auth types. Args: - user_id (str): complete @user:id + username (str): username supplied by the user + login_submission (dict): the whole of the login submission + (including 'type' and other relevant fields) Returns: - (str) the canonical_user_id + Deferred[str, func]: canonical user id, and optional callback + to be called once the access token and device id are issued Raises: - LoginError if login fails + StoreError if there was a problem accessing the database + SynapseError if there was a problem with the request + LoginError if there was an authentication problem. """ + + if username.startswith('@'): + qualified_user_id = username + else: + qualified_user_id = UserID( + username, self.hs.hostname + ).to_string() + + login_type = login_submission.get("type") + known_login_type = False + + # special case to check for "password" for the check_password interface + # for the auth providers + password = login_submission.get("password") + if login_type == LoginType.PASSWORD: + if not self._password_enabled: + raise SynapseError(400, "Password login has been disabled.") + if not password: + raise SynapseError(400, "Missing parameter: password") + for provider in self.password_providers: - is_valid = yield provider.check_password(user_id, password) - if is_valid: - defer.returnValue(user_id) + if (hasattr(provider, "check_password") + and login_type == LoginType.PASSWORD): + known_login_type = True + is_valid = yield provider.check_password( + qualified_user_id, password, + ) + if is_valid: + defer.returnValue((qualified_user_id, None)) + + if (not hasattr(provider, "get_supported_login_types") + or not hasattr(provider, "check_auth")): + # this password provider doesn't understand custom login types + continue + + supported_login_types = provider.get_supported_login_types() + if login_type not in supported_login_types: + # this password provider doesn't understand this login type + continue + + known_login_type = True + login_fields = supported_login_types[login_type] + + missing_fields = [] + login_dict = {} + for f in login_fields: + if f not in login_submission: + missing_fields.append(f) + else: + login_dict[f] = login_submission[f] + if missing_fields: + raise SynapseError( + 400, "Missing parameters for login type %s: %s" % ( + login_type, + missing_fields, + ), + ) - canonical_user_id = yield self._check_local_password(user_id, password) + result = yield provider.check_auth( + username, login_type, login_dict, + ) + if result: + if isinstance(result, str): + result = (result, None) + defer.returnValue(result) + + if login_type == LoginType.PASSWORD: + known_login_type = True + + canonical_user_id = yield self._check_local_password( + qualified_user_id, password, + ) - if canonical_user_id: - defer.returnValue(canonical_user_id) + if canonical_user_id: + defer.returnValue((canonical_user_id, None)) + + if not known_login_type: + raise SynapseError(400, "Unknown login type %s" % login_type) # unknown username or invalid password. We raise a 403 here, but note # that if we're doing user-interactive login, it turns all LoginErrors @@ -522,7 +715,7 @@ class AuthHandler(BaseHandler): if not lookupres: defer.returnValue(None) (user_id, password_hash) = lookupres - result = self.validate_hash(password, password_hash) + result = yield self.validate_hash(password, password_hash) if not result: logger.warn("Failed password login for user %s", user_id) defer.returnValue(None) @@ -546,22 +739,65 @@ class AuthHandler(BaseHandler): raise AuthError(403, "Invalid token", errcode=Codes.FORBIDDEN) @defer.inlineCallbacks - def set_password(self, user_id, newpassword, requester=None): - password_hash = self.hash(newpassword) + def delete_access_token(self, access_token): + """Invalidate a single access token - except_access_token_id = requester.access_token_id if requester else None + Args: + access_token (str): access token to be deleted - 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_id + Returns: + Deferred + """ + user_info = yield self.auth.get_user_by_access_token(access_token) + yield self.store.delete_access_token(access_token) + + # see if any of our auth providers want to know about this + for provider in self.password_providers: + if hasattr(provider, "on_logged_out"): + yield provider.on_logged_out( + user_id=str(user_info["user"]), + device_id=user_info["device_id"], + access_token=access_token, + ) + + # delete pushers associated with this access token + if user_info["token_id"] is not None: + yield self.hs.get_pusherpool().remove_pushers_by_access_token( + str(user_info["user"]), (user_info["token_id"], ) + ) + + @defer.inlineCallbacks + def delete_access_tokens_for_user(self, user_id, except_token_id=None, + device_id=None): + """Invalidate access tokens belonging to a user + + Args: + user_id (str): ID of user the tokens belong to + except_token_id (str|None): access_token ID which should *not* be + deleted + device_id (str|None): ID of device the tokens are associated with. + If None, tokens associated with any device (or no device) will + be deleted + Returns: + Deferred + """ + tokens_and_devices = yield self.store.user_delete_access_tokens( + user_id, except_token_id=except_token_id, device_id=device_id, ) - yield self.hs.get_pusherpool().remove_pushers_by_user( - user_id, except_access_token_id + + # see if any of our auth providers want to know about this + for provider in self.password_providers: + if hasattr(provider, "on_logged_out"): + for token, token_id, device_id in tokens_and_devices: + yield provider.on_logged_out( + user_id=user_id, + device_id=device_id, + access_token=token, + ) + + # delete pushers associated with the access tokens + yield self.hs.get_pusherpool().remove_pushers_by_access_token( + user_id, (token_id for _, token_id, _ in tokens_and_devices), ) @defer.inlineCallbacks @@ -599,16 +835,6 @@ class AuthHandler(BaseHandler): 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. @@ -617,10 +843,13 @@ class AuthHandler(BaseHandler): password (str): Password to hash. Returns: - Hashed password (str). + Deferred(str): Hashed password. """ - return bcrypt.hashpw(password.encode('utf8') + self.hs.config.password_pepper, - bcrypt.gensalt(self.bcrypt_rounds)) + def _do_hash(): + return bcrypt.hashpw(password.encode('utf8') + self.hs.config.password_pepper, + bcrypt.gensalt(self.bcrypt_rounds)) + + return make_deferred_yieldable(threads.deferToThread(_do_hash)) def validate_hash(self, password, stored_hash): """Validates that self.hash(password) == stored_hash. @@ -630,13 +859,19 @@ class AuthHandler(BaseHandler): stored_hash (str): Expected hash value. Returns: - Whether self.hash(password) == stored_hash (bool). + Deferred(bool): Whether self.hash(password) == stored_hash. """ + + def _do_validate_hash(): + return bcrypt.checkpw( + password.encode('utf8') + self.hs.config.password_pepper, + stored_hash.encode('utf8') + ) + if stored_hash: - return bcrypt.hashpw(password.encode('utf8') + self.hs.config.password_pepper, - stored_hash.encode('utf8')) == stored_hash + return make_deferred_yieldable(threads.deferToThread(_do_validate_hash)) else: - return False + return defer.succeed(False) class MacaroonGeneartor(object): @@ -679,30 +914,3 @@ class MacaroonGeneartor(object): macaroon.add_first_party_caveat("gen = 1") macaroon.add_first_party_caveat("user_id = %s" % (user_id,)) return macaroon - - -class _AccountHandler(object): - """A proxy object that gets passed to password auth providers so they - can register new users etc if necessary. - """ - def __init__(self, hs, check_user_exists): - self.hs = hs - - self._check_user_exists = check_user_exists - - def check_user_exists(self, user_id): - """Check if user exissts. - - Returns: - Deferred(bool) - """ - return self._check_user_exists(user_id) - - def register(self, localpart): - """Registers a new user with given localpart - - Returns: - Deferred: a 2-tuple of (user_id, access_token) - """ - reg = self.hs.get_handlers().registration_handler - return reg.register(localpart=localpart) |