anonymousland-synapse/synapse/storage/databases/main/ui_auth.py
2020-08-05 21:38:57 +01:00

301 lines
11 KiB
Python

# -*- coding: utf-8 -*-
# Copyright 2020 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.
from typing import Any, Dict, Optional, Union
import attr
from canonicaljson import json
from synapse.api.errors import StoreError
from synapse.storage._base import SQLBaseStore, db_to_json
from synapse.types import JsonDict
from synapse.util import stringutils as stringutils
@attr.s
class UIAuthSessionData:
session_id = attr.ib(type=str)
# The dictionary from the client root level, not the 'auth' key.
clientdict = attr.ib(type=JsonDict)
# The URI and method the session was intiatied with. These are checked at
# each stage of the authentication to ensure that the asked for operation
# has not changed.
uri = attr.ib(type=str)
method = attr.ib(type=str)
# A string description of the operation that the current authentication is
# authorising.
description = attr.ib(type=str)
class UIAuthWorkerStore(SQLBaseStore):
"""
Manage user interactive authentication sessions.
"""
async def create_ui_auth_session(
self, clientdict: JsonDict, uri: str, method: str, description: str,
) -> UIAuthSessionData:
"""
Creates a new user interactive authentication session.
The session can be used to track the stages necessary to authenticate a
user across multiple HTTP requests.
Args:
clientdict:
The dictionary from the client root level, not the 'auth' key.
uri:
The URI this session was initiated with, this is checked at each
stage of the authentication to ensure that the asked for
operation has not changed.
method:
The method this session was initiated with, this is checked at each
stage of the authentication to ensure that the asked for
operation has not changed.
description:
A string description of the operation that the current
authentication is authorising.
Returns:
The newly created session.
Raises:
StoreError if a unique session ID cannot be generated.
"""
# The clientdict gets stored as JSON.
clientdict_json = json.dumps(clientdict)
# autogen a session ID and try to create it. We may clash, so just
# try a few times till one goes through, giving up eventually.
attempts = 0
while attempts < 5:
session_id = stringutils.random_string(24)
try:
await self.db_pool.simple_insert(
table="ui_auth_sessions",
values={
"session_id": session_id,
"clientdict": clientdict_json,
"uri": uri,
"method": method,
"description": description,
"serverdict": "{}",
"creation_time": self.hs.get_clock().time_msec(),
},
desc="create_ui_auth_session",
)
return UIAuthSessionData(
session_id, clientdict, uri, method, description
)
except self.db_pool.engine.module.IntegrityError:
attempts += 1
raise StoreError(500, "Couldn't generate a session ID.")
async def get_ui_auth_session(self, session_id: str) -> UIAuthSessionData:
"""Retrieve a UI auth session.
Args:
session_id: The ID of the session.
Returns:
A dict containing the device information.
Raises:
StoreError if the session is not found.
"""
result = await self.db_pool.simple_select_one(
table="ui_auth_sessions",
keyvalues={"session_id": session_id},
retcols=("clientdict", "uri", "method", "description"),
desc="get_ui_auth_session",
)
result["clientdict"] = db_to_json(result["clientdict"])
return UIAuthSessionData(session_id, **result)
async def mark_ui_auth_stage_complete(
self, session_id: str, stage_type: str, result: Union[str, bool, JsonDict],
):
"""
Mark a session stage as completed.
Args:
session_id: The ID of the corresponding session.
stage_type: The completed stage type.
result: The result of the stage verification.
Raises:
StoreError if the session cannot be found.
"""
# Add (or update) the results of the current stage to the database.
#
# Note that we need to allow for the same stage to complete multiple
# times here so that registration is idempotent.
try:
await self.db_pool.simple_upsert(
table="ui_auth_sessions_credentials",
keyvalues={"session_id": session_id, "stage_type": stage_type},
values={"result": json.dumps(result)},
desc="mark_ui_auth_stage_complete",
)
except self.db_pool.engine.module.IntegrityError:
raise StoreError(400, "Unknown session ID: %s" % (session_id,))
async def get_completed_ui_auth_stages(
self, session_id: str
) -> Dict[str, Union[str, bool, JsonDict]]:
"""
Retrieve the completed stages of a UI authentication session.
Args:
session_id: The ID of the session.
Returns:
The completed stages mapped to the result of the verification of
that auth-type.
"""
results = {}
for row in await self.db_pool.simple_select_list(
table="ui_auth_sessions_credentials",
keyvalues={"session_id": session_id},
retcols=("stage_type", "result"),
desc="get_completed_ui_auth_stages",
):
results[row["stage_type"]] = db_to_json(row["result"])
return results
async def set_ui_auth_clientdict(
self, session_id: str, clientdict: JsonDict
) -> None:
"""
Store an updated clientdict for a given session ID.
Args:
session_id: The ID of this session as returned from check_auth
clientdict:
The dictionary from the client root level, not the 'auth' key.
"""
# The clientdict gets stored as JSON.
clientdict_json = json.dumps(clientdict)
await self.db_pool.simple_update_one(
table="ui_auth_sessions",
keyvalues={"session_id": session_id},
updatevalues={"clientdict": clientdict_json},
desc="set_ui_auth_client_dict",
)
async def set_ui_auth_session_data(self, session_id: str, key: str, value: Any):
"""
Store a key-value pair into the sessions data associated with this
request. This data is stored server-side and cannot be modified by
the client.
Args:
session_id: The ID of this session as returned from check_auth
key: The key to store the data under
value: The data to store
Raises:
StoreError if the session cannot be found.
"""
await self.db_pool.runInteraction(
"set_ui_auth_session_data",
self._set_ui_auth_session_data_txn,
session_id,
key,
value,
)
def _set_ui_auth_session_data_txn(self, txn, session_id: str, key: str, value: Any):
# Get the current value.
result = self.db_pool.simple_select_one_txn(
txn,
table="ui_auth_sessions",
keyvalues={"session_id": session_id},
retcols=("serverdict",),
)
# Update it and add it back to the database.
serverdict = db_to_json(result["serverdict"])
serverdict[key] = value
self.db_pool.simple_update_one_txn(
txn,
table="ui_auth_sessions",
keyvalues={"session_id": session_id},
updatevalues={"serverdict": json.dumps(serverdict)},
)
async def get_ui_auth_session_data(
self, session_id: str, key: str, default: Optional[Any] = None
) -> Any:
"""
Retrieve data stored with set_session_data
Args:
session_id: The ID of this session as returned from check_auth
key: The key to store the data under
default: Value to return if the key has not been set
Raises:
StoreError if the session cannot be found.
"""
result = await self.db_pool.simple_select_one(
table="ui_auth_sessions",
keyvalues={"session_id": session_id},
retcols=("serverdict",),
desc="get_ui_auth_session_data",
)
serverdict = db_to_json(result["serverdict"])
return serverdict.get(key, default)
class UIAuthStore(UIAuthWorkerStore):
def delete_old_ui_auth_sessions(self, expiration_time: int):
"""
Remove sessions which were last used earlier than the expiration time.
Args:
expiration_time: The latest time that is still considered valid.
This is an epoch time in milliseconds.
"""
return self.db_pool.runInteraction(
"delete_old_ui_auth_sessions",
self._delete_old_ui_auth_sessions_txn,
expiration_time,
)
def _delete_old_ui_auth_sessions_txn(self, txn, expiration_time: int):
# Get the expired sessions.
sql = "SELECT session_id FROM ui_auth_sessions WHERE creation_time <= ?"
txn.execute(sql, [expiration_time])
session_ids = [r[0] for r in txn.fetchall()]
# Delete the corresponding completed credentials.
self.db_pool.simple_delete_many_txn(
txn,
table="ui_auth_sessions_credentials",
column="session_id",
iterable=session_ids,
keyvalues={},
)
# Finally, delete the sessions.
self.db_pool.simple_delete_many_txn(
txn,
table="ui_auth_sessions",
column="session_id",
iterable=session_ids,
keyvalues={},
)