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# -*- coding: utf-8 -*-
# Copyright 2019 The Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# 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.
import logging
from typing import Any
from twisted.web.client import PartialDownloadError
from synapse.api.constants import LoginType
from synapse.api.errors import Codes, LoginError, SynapseError
from synapse.config.emailconfig import ThreepidBehaviour
from synapse.util import json_decoder
logger = logging.getLogger(__name__)
class UserInteractiveAuthChecker:
"""Abstract base class for an interactive auth checker"""
def __init__(self, hs):
pass
def is_enabled(self) -> bool:
"""Check if the configuration of the homeserver allows this checker to work
Returns:
True if this login type is enabled.
"""
async def check_auth(self, authdict: dict, clientip: str) -> Any:
"""Given the authentication dict from the client, attempt to check this step
Args:
authdict: authentication dictionary from the client
clientip: The IP address of the client.
Raises:
SynapseError if authentication failed
Returns:
The result of authentication (to pass back to the client?)
"""
raise NotImplementedError()
class DummyAuthChecker(UserInteractiveAuthChecker):
AUTH_TYPE = LoginType.DUMMY
def is_enabled(self):
return True
async def check_auth(self, authdict, clientip):
return True
class TermsAuthChecker(UserInteractiveAuthChecker):
AUTH_TYPE = LoginType.TERMS
def is_enabled(self):
return True
async def check_auth(self, authdict, clientip):
return True
class RecaptchaAuthChecker(UserInteractiveAuthChecker):
AUTH_TYPE = LoginType.RECAPTCHA
def __init__(self, hs):
super().__init__(hs)
self._enabled = bool(hs.config.recaptcha_private_key)
self._http_client = hs.get_proxied_http_client()
self._url = hs.config.recaptcha_siteverify_api
self._secret = hs.config.recaptcha_private_key
def is_enabled(self):
return self._enabled
async def check_auth(self, authdict, clientip):
try:
user_response = authdict["response"]
except KeyError:
# Client tried to provide captcha but didn't give the parameter:
# bad request.
raise LoginError(
400, "Captcha response is required", errcode=Codes.CAPTCHA_NEEDED
)
logger.info(
"Submitting recaptcha response %s with remoteip %s", user_response, clientip
)
# TODO: get this from the homeserver rather than creating a new one for
# each request
try:
resp_body = await self._http_client.post_urlencoded_get_json(
self._url,
args={
"secret": self._secret,
"response": user_response,
"remoteip": clientip,
},
)
except PartialDownloadError as pde:
# Twisted is silly
data = pde.response
resp_body = json_decoder.decode(data.decode("utf-8"))
if "success" in resp_body:
# Note that we do NOT check the hostname here: we explicitly
# intend the CAPTCHA to be presented by whatever client the
# user is using, we just care that they have completed a CAPTCHA.
logger.info(
"%s reCAPTCHA from hostname %s",
"Successful" if resp_body["success"] else "Failed",
resp_body.get("hostname"),
)
if resp_body["success"]:
return True
raise LoginError(401, "", errcode=Codes.UNAUTHORIZED)
class _BaseThreepidAuthChecker:
def __init__(self, hs):
self.hs = hs
self.store = hs.get_datastore()
async def _check_threepid(self, medium, authdict):
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,))
# msisdns are currently always ThreepidBehaviour.REMOTE
if medium == "msisdn":
if not self.hs.config.account_threepid_delegate_msisdn:
raise SynapseError(
400, "Phone number verification is not enabled on this homeserver"
)
threepid = await identity_handler.threepid_from_creds(
self.hs.config.account_threepid_delegate_msisdn, threepid_creds
)
elif medium == "email":
if self.hs.config.threepid_behaviour_email == ThreepidBehaviour.REMOTE:
assert self.hs.config.account_threepid_delegate_email
threepid = await identity_handler.threepid_from_creds(
self.hs.config.account_threepid_delegate_email, threepid_creds
)
elif self.hs.config.threepid_behaviour_email == ThreepidBehaviour.LOCAL:
threepid = None
row = await self.store.get_threepid_validation_session(
medium,
threepid_creds["client_secret"],
sid=threepid_creds["sid"],
validated=True,
)
if row:
threepid = {
"medium": row["medium"],
"address": row["address"],
"validated_at": row["validated_at"],
}
# Valid threepid returned, delete from the db
await self.store.delete_threepid_session(threepid_creds["sid"])
else:
raise SynapseError(
400, "Email address verification is not enabled on this homeserver"
)
else:
# this can't happen!
raise AssertionError("Unrecognized threepid medium: %s" % (medium,))
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"]
return threepid
class EmailIdentityAuthChecker(UserInteractiveAuthChecker, _BaseThreepidAuthChecker):
AUTH_TYPE = LoginType.EMAIL_IDENTITY
def __init__(self, hs):
UserInteractiveAuthChecker.__init__(self, hs)
_BaseThreepidAuthChecker.__init__(self, hs)
def is_enabled(self):
return self.hs.config.threepid_behaviour_email in (
ThreepidBehaviour.REMOTE,
ThreepidBehaviour.LOCAL,
)
async def check_auth(self, authdict, clientip):
return await self._check_threepid("email", authdict)
class MsisdnAuthChecker(UserInteractiveAuthChecker, _BaseThreepidAuthChecker):
AUTH_TYPE = LoginType.MSISDN
def __init__(self, hs):
UserInteractiveAuthChecker.__init__(self, hs)
_BaseThreepidAuthChecker.__init__(self, hs)
def is_enabled(self):
return bool(self.hs.config.account_threepid_delegate_msisdn)
async def check_auth(self, authdict, clientip):
return await self._check_threepid("msisdn", authdict)
INTERACTIVE_AUTH_CHECKERS = [
DummyAuthChecker,
TermsAuthChecker,
RecaptchaAuthChecker,
EmailIdentityAuthChecker,
MsisdnAuthChecker,
]
"""A list of UserInteractiveAuthChecker classes"""
|
