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Code Issues Releases Wiki Activity

Implement require_signature mode in FSMManagingEH

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This commit is contained in:
Kristóf Tóth 2018-07-23 17:16:37 +02:00
parent e846a2b111
commit b3e8af2024
1 changed files with 20 additions and 14 deletions
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34
lib/tfw/components/fsm_managing_event_handler.py
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@ -2,18 +2,19 @@
# All Rights Reserved. See LICENSE file for details. # All Rights Reserved. See LICENSE file for details.
from tfw import EventHandlerBase from tfw import EventHandlerBase
from tfw.crypto import KeyManager, sign_message from tfw.crypto import KeyManager, sign_message, verify_message
from tfw.config.logs import logging from tfw.config.logs import logging
LOG = logging.getLogger(__name__) LOG = logging.getLogger(__name__)
class FSMManagingEventHandler(EventHandlerBase): class FSMManagingEventHandler(EventHandlerBase):
def __init__(self, key, fsm_type): def __init__(self, key, fsm_type, require_signature=False):
super().__init__(key) super().__init__(key)
self.fsm = fsm_type() self.fsm = fsm_type()
self._fsm_updater = FSMUpdater(self.fsm) self._fsm_updater = FSMUpdater(self.fsm)
self.auth_key = KeyManager().auth_key self.auth_key = KeyManager().auth_key
self._require_signature = require_signature
self.command_handlers = { self.command_handlers = {
'trigger': self.handle_trigger, 'trigger': self.handle_trigger,
@ -22,24 +23,29 @@ class FSMManagingEventHandler(EventHandlerBase):
def handle_event(self, message): def handle_event(self, message):
try: try:
data = message['data'] message = self.command_handlers[message['data']['command']](message)
message['data'] = self.command_handlers[data['command']](data) if message:
fsm_update_message = self._fsm_updater.generate_fsm_update() fsm_update_message = self._fsm_updater.generate_fsm_update()
sign_message(self.auth_key, message) sign_message(self.auth_key, message)
sign_message(self.auth_key, fsm_update_message) sign_message(self.auth_key, fsm_update_message)
self.server_connector.broadcast(fsm_update_message) self.server_connector.broadcast(fsm_update_message)
return message return message
except KeyError: except KeyError:
LOG.error('IGNORING MESSAGE: Invalid message received: %s', message) LOG.error('IGNORING MESSAGE: Invalid message received: %s', message)
def handle_trigger(self, data): def handle_trigger(self, message):
trigger = data['value'] trigger = message['data']['value']
self.fsm.step(trigger) if self._require_signature:
return data if not verify_message(self.auth_key, message):
LOG.error('Ignoring unsigned trigger command: %s', message)
return None
if self.fsm.step(trigger):
return message
return None
def handle_update(self, data): def handle_update(self, message):
# pylint: disable=no-self-use # pylint: disable=no-self-use
return data return message
class FSMUpdater: class FSMUpdater: