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Don't fail /submit_token requests on incorrect session ID if request_token_inhibit_3pid_errors is turned on (#7991)
* Don't raise session_id errors on submit_token if request_token_inhibit_3pid_errors is set * Changelog * Also wait some time before responding to /requestToken * Incorporate review * Update synapse/storage/databases/main/registration.py Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com> * Incorporate review Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com>
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changelog.d/7991.misc
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changelog.d/7991.misc
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Don't fail `/submit_token` requests on incorrect session ID if `request_token_inhibit_3pid_errors` is turned on.
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@ -15,6 +15,7 @@
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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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import logging
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import random
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from http import HTTPStatus
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from synapse.api.constants import LoginType
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@ -109,6 +110,9 @@ class EmailPasswordRequestTokenRestServlet(RestServlet):
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if self.config.request_token_inhibit_3pid_errors:
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# Make the client think the operation succeeded. See the rationale in the
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# comments for request_token_inhibit_3pid_errors.
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# Also wait for some random amount of time between 100ms and 1s to make it
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# look like we did something.
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await self.hs.clock.sleep(random.randint(1, 10) / 10)
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return 200, {"sid": random_string(16)}
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raise SynapseError(400, "Email not found", Codes.THREEPID_NOT_FOUND)
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@ -448,6 +452,9 @@ class EmailThreepidRequestTokenRestServlet(RestServlet):
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if self.config.request_token_inhibit_3pid_errors:
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# Make the client think the operation succeeded. See the rationale in the
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# comments for request_token_inhibit_3pid_errors.
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# Also wait for some random amount of time between 100ms and 1s to make it
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# look like we did something.
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await self.hs.clock.sleep(random.randint(1, 10) / 10)
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return 200, {"sid": random_string(16)}
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raise SynapseError(400, "Email is already in use", Codes.THREEPID_IN_USE)
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@ -516,6 +523,9 @@ class MsisdnThreepidRequestTokenRestServlet(RestServlet):
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if self.hs.config.request_token_inhibit_3pid_errors:
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# Make the client think the operation succeeded. See the rationale in the
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# comments for request_token_inhibit_3pid_errors.
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# Also wait for some random amount of time between 100ms and 1s to make it
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# look like we did something.
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await self.hs.clock.sleep(random.randint(1, 10) / 10)
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return 200, {"sid": random_string(16)}
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raise SynapseError(400, "MSISDN is already in use", Codes.THREEPID_IN_USE)
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@ -16,6 +16,7 @@
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import hmac
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import logging
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import random
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from typing import List, Union
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import synapse
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@ -131,6 +132,9 @@ class EmailRegisterRequestTokenRestServlet(RestServlet):
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if self.hs.config.request_token_inhibit_3pid_errors:
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# Make the client think the operation succeeded. See the rationale in the
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# comments for request_token_inhibit_3pid_errors.
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# Also wait for some random amount of time between 100ms and 1s to make it
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# look like we did something.
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await self.hs.clock.sleep(random.randint(1, 10) / 10)
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return 200, {"sid": random_string(16)}
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raise SynapseError(400, "Email is already in use", Codes.THREEPID_IN_USE)
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@ -203,6 +207,9 @@ class MsisdnRegisterRequestTokenRestServlet(RestServlet):
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if self.hs.config.request_token_inhibit_3pid_errors:
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# Make the client think the operation succeeded. See the rationale in the
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# comments for request_token_inhibit_3pid_errors.
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# Also wait for some random amount of time between 100ms and 1s to make it
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# look like we did something.
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await self.hs.clock.sleep(random.randint(1, 10) / 10)
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return 200, {"sid": random_string(16)}
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raise SynapseError(
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@ -889,6 +889,7 @@ class RegistrationStore(RegistrationBackgroundUpdateStore):
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super(RegistrationStore, self).__init__(database, db_conn, hs)
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self._account_validity = hs.config.account_validity
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self._ignore_unknown_session_error = hs.config.request_token_inhibit_3pid_errors
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if self._account_validity.enabled:
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self._clock.call_later(
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@ -1302,15 +1303,22 @@ class RegistrationStore(RegistrationBackgroundUpdateStore):
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)
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if not row:
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raise ThreepidValidationError(400, "Unknown session_id")
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if self._ignore_unknown_session_error:
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# If we need to inhibit the error caused by an incorrect session ID,
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# use None as placeholder values for the client secret and the
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# validation timestamp.
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# It shouldn't be an issue because they're both only checked after
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# the token check, which should fail. And if it doesn't for some
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# reason, the next check is on the client secret, which is NOT NULL,
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# so we don't have to worry about the client secret matching by
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# accident.
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row = {"client_secret": None, "validated_at": None}
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else:
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raise ThreepidValidationError(400, "Unknown session_id")
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retrieved_client_secret = row["client_secret"]
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validated_at = row["validated_at"]
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if retrieved_client_secret != client_secret:
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raise ThreepidValidationError(
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400, "This client_secret does not match the provided session_id"
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)
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row = self.db_pool.simple_select_one_txn(
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txn,
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table="threepid_validation_token",
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@ -1326,6 +1334,11 @@ class RegistrationStore(RegistrationBackgroundUpdateStore):
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expires = row["expires"]
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next_link = row["next_link"]
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if retrieved_client_secret != client_secret:
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raise ThreepidValidationError(
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400, "This client_secret does not match the provided session_id"
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)
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# If the session is already validated, no need to revalidate
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if validated_at:
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return next_link
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@ -17,6 +17,7 @@
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from twisted.internet import defer
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from synapse.api.constants import UserTypes
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from synapse.api.errors import ThreepidValidationError
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from tests import unittest
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from tests.utils import setup_test_homeserver
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@ -122,3 +123,33 @@ class RegistrationStoreTestCase(unittest.TestCase):
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)
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res = yield self.store.is_support_user(SUPPORT_USER)
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self.assertTrue(res)
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@defer.inlineCallbacks
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def test_3pid_inhibit_invalid_validation_session_error(self):
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"""Tests that enabling the configuration option to inhibit 3PID errors on
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/requestToken also inhibits validation errors caused by an unknown session ID.
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"""
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# Check that, with the config setting set to false (the default value), a
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# validation error is caused by the unknown session ID.
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try:
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yield defer.ensureDeferred(
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self.store.validate_threepid_session(
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"fake_sid", "fake_client_secret", "fake_token", 0,
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)
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)
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except ThreepidValidationError as e:
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self.assertEquals(e.msg, "Unknown session_id", e)
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# Set the config setting to true.
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self.store._ignore_unknown_session_error = True
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# Check that now the validation error is caused by the token not matching.
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try:
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yield defer.ensureDeferred(
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self.store.validate_threepid_session(
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"fake_sid", "fake_client_secret", "fake_token", 0,
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)
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)
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except ThreepidValidationError as e:
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self.assertEquals(e.msg, "Validation token not found or has expired", e)
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