Island: Simplify agent encryption calls

monkey/monkey_island/cc/repository/agent_event_encryption.py

@@ -1,23 +1,17 @@
 import json
-from typing import Callable, Iterable
+from typing import Callable
 
 from common.agent_event_serializers import JSONSerializable
 from common.agent_events import AbstractAgentEvent
 
 ENCRYPTED_PREFIX = "encrypted_"
-
-
-def get_fields_to_encrypt(event: AbstractAgentEvent):
-    """
-    Get the fields of the event that are not part of the base AbstractAgentEvent.
-    """
-    return set(vars(AbstractAgentEvent)["__fields__"].keys()) ^ set(event.dict().keys())
+ABSTRACT_AGENT_EVENT_FIELDS = vars(AbstractAgentEvent)["__fields__"].keys()
+SERIALIZED_EVENT_FIELDS = set(ABSTRACT_AGENT_EVENT_FIELDS) | set(["type"])
 
 
 def encrypt_event(
     encrypt: Callable[[bytes], bytes],
     event_data: JSONSerializable,
-    fields: Iterable[str] = [],
 ) -> JSONSerializable:
     """
     Encrypt a serialized AbstractAgentEvent
@@ -27,7 +21,6 @@ def encrypt_event(
 
     :param encrypt: Callable used to encrypt data
     :param event_data: Serialized event to encrypt
-    :param fields: Fields to encrypt
     :return: Serialized event with the fields encrypted
     :raises TypeError: If the serialized data is not a dict
     """
@@ -35,7 +28,8 @@ def encrypt_event(
         raise TypeError("Event encryption only supported for dict")
 
     data = event_data.copy()
-    for field in fields:
+    fields_to_encrypt = SERIALIZED_EVENT_FIELDS ^ set(event_data.keys())
+    for field in fields_to_encrypt:
         data[ENCRYPTED_PREFIX + field] = str(
             encrypt(json.dumps(event_data[field]).encode()), "utf-8"
         )

monkey/monkey_island/cc/repository/mongo_agent_event_repository.py

@@ -9,7 +9,7 @@ from monkey_island.cc.repository import IAgentEventRepository
 from monkey_island.cc.server_utils.encryption import ILockableEncryptor
 
 from . import RemovalError, RetrievalError, StorageError
-from .agent_event_encryption import decrypt_event, encrypt_event, get_fields_to_encrypt
+from .agent_event_encryption import decrypt_event, encrypt_event
 from .consts import MONGO_OBJECT_ID_KEY
 
 
@@ -30,8 +30,7 @@ class MongoAgentEventRepository(IAgentEventRepository):
         try:
             serializer = self._serializers[type(event)]
             serialized_event = serializer.serialize(event)
-            fields = get_fields_to_encrypt(event)
-            encrypted_event = encrypt_event(self._encryptor.encrypt, serialized_event, fields)
+            encrypted_event = encrypt_event(self._encryptor.encrypt, serialized_event)
             self._events_collection.insert_one(encrypted_event)
         except Exception as err:
             raise StorageError(f"Error saving event: {err}")

monkey/tests/unit_tests/monkey_island/cc/repository/test_agent_event_encryption.py

@@ -5,11 +5,7 @@ import pytest
 
 from common.agent_event_serializers import PydanticAgentEventSerializer
 from common.agent_events import AbstractAgentEvent
-from monkey_island.cc.repository.agent_event_encryption import (
-    decrypt_event,
-    encrypt_event,
-    get_fields_to_encrypt,
-)
+from monkey_island.cc.repository.agent_event_encryption import decrypt_event, encrypt_event
 from monkey_island.cc.server_utils.encryption import RepositoryEncryptor
 
 
@@ -43,8 +39,7 @@ def serializer():
 
 def test_agent_event_encryption__encrypts(encryptor, serializer):
     data = serializer.serialize(EVENT)
-    fields = get_fields_to_encrypt(EVENT)
-    encrypted_data = encrypt_event(encryptor.encrypt, data, fields)
+    encrypted_data = encrypt_event(encryptor.encrypt, data)
 
     # Encrypted fields have the "encrypted_" prefix
     assert "encrypted_data" in encrypted_data
@@ -55,8 +50,7 @@ def test_agent_event_encryption__encrypts(encryptor, serializer):
 
 def test_agent_event_encryption__decrypts(encryptor, serializer):
     data = serializer.serialize(EVENT)
-    fields = get_fields_to_encrypt(EVENT)
-    encrypted_data = encrypt_event(encryptor.encrypt, data, fields)
+    encrypted_data = encrypt_event(encryptor.encrypt, data)
 
     decrypted_data = decrypt_event(encryptor.decrypt, encrypted_data)
     deserialized_event = serializer.deserialize(decrypted_data)