Agent: Fix FingerprintData mypy issues

monkey/common/network/network_range.py

@@ -193,7 +193,7 @@ class SingleIpRange(NetworkRange):
         :return: A tuple in format (IP, domain_name). Eg. (192.168.55.1, www.google.com)
         """
         # The most common use case is to enter ip/range into "Scan IP/subnet list"
-        domain_name = None
+        domain_name = ""
 
         if " " in string_:
             raise ValueError(f'"{string_}" is not a valid IP address or domain name.')

monkey/infection_monkey/i_puppet/i_puppet.py

@@ -1,10 +1,10 @@
 import abc
 import threading
-from collections import namedtuple
-from dataclasses import dataclass
+from dataclasses import dataclass, field
 from enum import Enum
-from typing import Dict, Iterable, List, Mapping, Sequence
+from typing import Dict, Iterable, List, Mapping, Optional, Sequence, Tuple
 
+from common import OperatingSystem
 from common.credentials import Credentials
 from infection_monkey.model import VictimHost
 
@@ -26,15 +26,37 @@ class ExploiterResultData:
     propagation_success: bool = False
     interrupted: bool = False
     os: str = ""
-    info: Mapping = None
-    attempts: Iterable = None
+    info: Mapping = field(default_factory=lambda: {})
+    attempts: Iterable = field(default_factory=lambda: [])
     error_message: str = ""
 
 
-PingScanData = namedtuple("PingScanData", ["response_received", "os"])
-PortScanData = namedtuple("PortScanData", ["port", "status", "banner", "service"])
-FingerprintData = namedtuple("FingerprintData", ["os_type", "os_version", "services"])
-PostBreachData = namedtuple("PostBreachData", ["display_name", "command", "result"])
+@dataclass(frozen=True)
+class FingerprintData:
+    os_type: Optional[OperatingSystem]
+    os_version: str
+    services: Mapping = field(default_factory=lambda: {})
+
+
+@dataclass(frozen=True)
+class PingScanData:
+    response_received: bool
+    os: Optional[OperatingSystem]
+
+
+@dataclass(frozen=True)
+class PortScanData:
+    port: int
+    status: PortStatus
+    banner: str
+    service: str
+
+
+@dataclass(frozen=True)
+class PostBreachData:
+    display_name: str
+    command: str
+    result: Tuple[str, bool]
 
 
 class IPuppet(metaclass=abc.ABCMeta):
@@ -84,7 +106,7 @@ class IPuppet(metaclass=abc.ABCMeta):
     @abc.abstractmethod
     def scan_tcp_ports(
         self, host: str, ports: List[int], timeout: float = 3
-    ) -> Dict[int, PortScanData]:
+    ) -> Mapping[int, PortScanData]:
         """
         Scans a list of TCP ports on a remote host
 
@@ -92,7 +114,7 @@ class IPuppet(metaclass=abc.ABCMeta):
         :param int ports: List of TCP port numbers to scan
         :param float timeout: The maximum amount of time (in seconds) to wait for a response
         :return: The data collected by scanning the provided host:ports combination
-        :rtype: Dict[int, PortScanData]
+        :rtype: Mapping[int, PortScanData]
         """
 
     @abc.abstractmethod
@@ -125,6 +147,7 @@ class IPuppet(metaclass=abc.ABCMeta):
         name: str,
         host: VictimHost,
         current_depth: int,
+        servers: Sequence[str],
         options: Dict,
         interrupt: threading.Event,
     ) -> ExploiterResultData:

monkey/infection_monkey/master/propagator.py

@@ -2,7 +2,7 @@ import logging
 from ipaddress import IPv4Interface
 from queue import Queue
 from threading import Event
-from typing import List, Sequence
+from typing import Dict, List, Sequence
 
 from common.agent_configuration import (
     ExploitationConfiguration,
@@ -154,11 +154,12 @@ class Propagator:
             victim_host.services[psd.service] = {}
             victim_host.services[psd.service]["display_name"] = "unknown(TCP)"
             victim_host.services[psd.service]["port"] = psd.port
-            if psd.banner is not None:
-                victim_host.services[psd.service]["banner"] = psd.banner
+            victim_host.services[psd.service]["banner"] = psd.banner
 
     @staticmethod
-    def _process_fingerprinter_results(victim_host: VictimHost, fingerprint_data: FingerprintData):
+    def _process_fingerprinter_results(
+        victim_host: VictimHost, fingerprint_data: Dict[str, FingerprintData]
+    ):
         for fd in fingerprint_data.values():
             # TODO: This logic preserves the existing behavior prior to introducing IMaster and
             #       IPuppet, but it is possibly flawed. Different fingerprinters may detect
@@ -167,7 +168,7 @@ class Propagator:
             if fd.os_type is not None:
                 victim_host.os["type"] = fd.os_type
 
-            if ("version" not in victim_host.os) and (fd.os_version is not None):
+            if ("version" not in victim_host.os) and (fd.os_version):
                 victim_host.os["version"] = fd.os_version
 
             for service, details in fd.services.items():

monkey/infection_monkey/model/host.py

@@ -10,7 +10,7 @@ class VictimHost(object):
         self.os: Dict[str, Any] = {}
         self.services: Dict[str, Any] = {}
         self.icmp = False
-        self.default_server = None
+        self.default_server = ""
 
     def as_dict(self):
         return self.__dict__

monkey/infection_monkey/network_scanning/elasticsearch_fingerprinter.py

@@ -31,10 +31,10 @@ class ElasticSearchFingerprinter(IFingerprinter):
         port_scan_data: Dict[int, PortScanData],
         _options: Dict,
     ) -> FingerprintData:
-        services = {}
+        services: Dict[str, Any] = {}
 
         if (ES_PORT not in port_scan_data) or (port_scan_data[ES_PORT].status != PortStatus.OPEN):
-            return FingerprintData(None, None, services)
+            return FingerprintData(None, "", services)
 
         try:
             elasticsearch_info = _query_elasticsearch(host)
@@ -42,7 +42,7 @@ class ElasticSearchFingerprinter(IFingerprinter):
         except Exception as ex:
             logger.debug(f"Did not detect an ElasticSearch cluster: {ex}")
 
-        return FingerprintData(None, None, services)
+        return FingerprintData(None, "", services)
 
 
 def _query_elasticsearch(host: str) -> Dict[str, Any]:

monkey/infection_monkey/network_scanning/http_fingerprinter.py

@@ -1,6 +1,6 @@
 import logging
 from contextlib import closing
-from typing import Any, Dict, Iterable, Optional, Set, Tuple
+from typing import Any, Dict, Iterable, Mapping, Optional, Set, Tuple
 
 from requests import head
 from requests.exceptions import ConnectionError, Timeout
@@ -46,7 +46,7 @@ class HTTPFingerprinter(IFingerprinter):
                     "data": (server_header_contents, ssl),
                 }
 
-        return FingerprintData(None, None, services)
+        return FingerprintData(None, "", services)
 
 
 def _query_potential_http_server(host: str, port: int) -> Tuple[Optional[str], Optional[bool]]:
@@ -71,7 +71,7 @@ def _get_server_from_headers(url: str) -> Optional[str]:
     return None
 
 
-def _get_http_headers(url: str) -> Optional[Dict[str, Any]]:
+def _get_http_headers(url: str) -> Optional[Mapping[str, Any]]:
     try:
         logger.debug(f"Sending request for headers to {url}")
         with closing(head(url, verify=False, timeout=1)) as response:  # noqa: DUO123

monkey/infection_monkey/network_scanning/mssql_fingerprinter.py

@@ -1,7 +1,7 @@
 import errno
 import logging
 import socket
-from typing import Any, Dict, Optional
+from typing import Any, Dict
 
 from infection_monkey.i_puppet import FingerprintData, IFingerprinter, PingScanData, PortScanData
 
@@ -32,10 +32,10 @@ class MSSQLFingerprinter(IFingerprinter):
         except Exception as ex:
             logger.debug(f"Did not detect an MSSQL server: {ex}")
 
-        return FingerprintData(None, None, services)
+        return FingerprintData(None, "", services)
 
 
-def _query_mssql_for_instance_data(host: str) -> Optional[bytes]:
+def _query_mssql_for_instance_data(host: str) -> bytes:
     # Create a UDP socket and sets a timeout
     sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
     sock.settimeout(_MSSQL_SOCKET_TIMEOUT)
@@ -44,22 +44,20 @@ def _query_mssql_for_instance_data(host: str) -> Optional[bytes]:
 
     # The message is a CLNT_UCAST_EX packet to get all instances
     # https://msdn.microsoft.com/en-us/library/cc219745.aspx
-    message = "\x03"
+    message_str = "\x03"
 
     # Encode the message as a bytes array
-    message = message.encode()
+    message = message_str.encode()
 
     # send data and receive response
     try:
-        logger.info(f"Sending message to requested host: {host}, {message}")
+        logger.info(f"Sending message to requested host: {host}, {message_str}")
         sock.sendto(message, server_address)
         data, _ = sock.recvfrom(_BUFFER_SIZE)
 
         return data
     except socket.timeout as err:
-        logger.debug(
-            f"Socket timeout reached, maybe browser service on host: {host} doesnt " "exist"
-        )
+        logger.debug(f"Socket timeout reached, maybe browser service on host: {host} doesn't exist")
         raise err
     except socket.error as err:
         if err.errno == errno.ECONNRESET:
@@ -78,7 +76,7 @@ def _query_mssql_for_instance_data(host: str) -> Optional[bytes]:
 
 
 def _get_services_from_server_data(data: bytes) -> Dict[str, Any]:
-    services = {MSSQL_SERVICE: {}}
+    services: Dict[str, Any] = {MSSQL_SERVICE: {}}
     services[MSSQL_SERVICE]["display_name"] = DISPLAY_NAME
     services[MSSQL_SERVICE]["port"] = SQL_BROWSER_DEFAULT_PORT
 

monkey/infection_monkey/network_scanning/scan_target_generator.py

@@ -26,10 +26,10 @@ def compile_scan_target_list(
         scan_targets.extend(_get_ips_to_scan_from_local_interface(local_network_interfaces))
 
     if inaccessible_subnets:
-        inaccessible_subnets = _get_segmentation_check_targets(
+        inaccessible_subnet_addresses = _get_segmentation_check_targets(
             inaccessible_subnets, local_network_interfaces
         )
-        scan_targets.extend(inaccessible_subnets)
+        scan_targets.extend(inaccessible_subnet_addresses)
 
     scan_targets = _remove_interface_ips(scan_targets, local_network_interfaces)
     scan_targets = _remove_blocklisted_ips(scan_targets, blocklisted_ips)
@@ -44,7 +44,7 @@ def _remove_redundant_targets(targets: List[NetworkAddress]) -> List[NetworkAddr
     for target in targets:
         domain_name = target.domain
         ip = target.ip
-        if ip not in reverse_dns or (reverse_dns[ip] is None and domain_name is not None):
+        if ip not in reverse_dns or (not reverse_dns[ip] and domain_name):
             reverse_dns[ip] = domain_name
     return [NetworkAddress(key, value) for (key, value) in reverse_dns.items()]
 
@@ -55,7 +55,7 @@ def _range_to_addresses(range_obj: NetworkRange) -> List[NetworkAddress]:
         if hasattr(range_obj, "domain_name"):
             addresses.append(NetworkAddress(address, range_obj.domain_name))
         else:
-            addresses.append(NetworkAddress(address, None))
+            addresses.append(NetworkAddress(address, ""))
     return addresses
 
 

monkey/infection_monkey/network_scanning/smb_fingerprinter.py

@@ -144,16 +144,16 @@ class SMBFingerprinter(IFingerprinter):
         port_scan_data: Dict[int, PortScanData],
         _options: Dict,
     ) -> FingerprintData:
-        services = {}
+        services: Dict = {}
         smb_service = {
             "display_name": DISPLAY_NAME,
             "port": SMB_PORT,
         }
         os_type = None
-        os_version = None
+        os_version = ""
 
         if (SMB_PORT not in port_scan_data) or (port_scan_data[SMB_PORT].status != PortStatus.OPEN):
-            return FingerprintData(None, None, services)
+            return FingerprintData(None, "", services)
 
         logger.debug(f"Fingerprinting potential SMB port {SMB_PORT} on {host}")
 

monkey/infection_monkey/network_scanning/ssh_fingerprinter.py

@@ -21,7 +21,7 @@ class SSHFingerprinter(IFingerprinter):
         _options: Dict,
     ) -> FingerprintData:
         os_type = None
-        os_version = None
+        os_version = ""
         services = {}
 
         for ps_data in port_scan_data.values():
@@ -35,9 +35,9 @@ class SSHFingerprinter(IFingerprinter):
         return FingerprintData(os_type, os_version, services)
 
     @staticmethod
-    def _get_host_os(banner) -> Tuple[Optional[str], Optional[str]]:
+    def _get_host_os(banner) -> Tuple[Optional[OperatingSystem], str]:
         os = None
-        os_version = None
+        os_version = ""
         for dist in LINUX_DIST_SSH:
             if banner.lower().find(dist) != -1:
                 os_version = banner.split(" ").pop().strip()

monkey/infection_monkey/network_scanning/tcp_scanner.py

@@ -12,7 +12,7 @@ from infection_monkey.network.tools import BANNER_READ, DEFAULT_TIMEOUT, tcp_por
 logger = logging.getLogger(__name__)
 
 POLL_INTERVAL = 0.5
-EMPTY_PORT_SCAN = {-1: PortScanData(-1, PortStatus.CLOSED, None, None)}
+EMPTY_PORT_SCAN = {-1: PortScanData(-1, PortStatus.CLOSED, "", "")}
 
 
 def scan_tcp_ports(
@@ -48,7 +48,7 @@ def _build_port_scan_data(
 
 
 def _get_closed_port_data(port: int) -> PortScanData:
-    return PortScanData(port, PortStatus.CLOSED, None, None)
+    return PortScanData(port, PortStatus.CLOSED, "", "")
 
 
 def _check_tcp_ports(

monkey/infection_monkey/payload/ransomware/ransomware_options.py

@@ -1,4 +1,6 @@
 import logging
+from pathlib import Path
+from typing import Optional
 
 from common.utils.file_utils import InvalidPath, expand_path
 from infection_monkey.utils.environment import is_windows_os
@@ -12,7 +14,7 @@ class RansomwareOptions:
         self.file_extension = options["encryption"]["file_extension"]
         self.readme_enabled = options["other_behaviors"]["readme"]
 
-        self.target_directory = None
+        self.target_directory: Optional[Path] = None
         self._set_target_directory(options["encryption"]["directories"])
 
     def _set_target_directory(self, os_target_directories: dict):

monkey/infection_monkey/post_breach/pba.py

@@ -1,6 +1,6 @@
 import logging
 import subprocess
-from typing import Dict, Iterable
+from typing import Dict, Iterable, List, Tuple
 
 from common.common_consts.timeouts import LONG_REQUEST_TIMEOUT
 from common.utils.attack_utils import ScanStatus
@@ -33,7 +33,7 @@ class PBA:
         """
         self.command = PBA.choose_command(linux_cmd, windows_cmd)
         self.name = name
-        self.pba_data = []
+        self.pba_data: List[PostBreachData] = []
         self.telemetry_messenger = telemetry_messenger
         self.timeout = timeout
 
@@ -73,7 +73,7 @@ class PBA:
         pba_execution_succeeded = pba_execution_result[1]
         return pba_execution_succeeded and self.is_script()
 
-    def _execute_default(self):
+    def _execute_default(self) -> Tuple[str, bool]:
         """
         Default post breach command execution routine
         :return: Tuple of command's output string and boolean, indicating if it succeeded
@@ -84,7 +84,7 @@ class PBA:
             ).decode()
             return output, True
         except subprocess.CalledProcessError as err:
-            return err.output.decode(), False
+            return bytes(err.output).decode(), False
         except subprocess.TimeoutExpired as err:
             return str(err), False
 

monkey/infection_monkey/puppet/puppet.py

@@ -1,6 +1,6 @@
 import logging
 import threading
-from typing import Dict, Iterable, List, Sequence
+from typing import Dict, Iterable, List, Mapping, Sequence
 
 from common.common_consts.timeouts import CONNECTION_TIMEOUT
 from common.credentials import Credentials
@@ -8,6 +8,7 @@ from infection_monkey import network_scanning
 from infection_monkey.i_puppet import (
     ExploiterResultData,
     FingerprintData,
+    IFingerprinter,
     IPuppet,
     PingScanData,
     PluginType,
@@ -18,7 +19,7 @@ from infection_monkey.model import VictimHost
 
 from .plugin_registry import PluginRegistry
 
-EMPTY_FINGERPRINT = PingScanData(False, None)
+EMPTY_FINGERPRINT = FingerprintData(None, "", {})
 
 logger = logging.getLogger()
 
@@ -45,7 +46,7 @@ class Puppet(IPuppet):
 
     def scan_tcp_ports(
         self, host: str, ports: List[int], timeout: float = CONNECTION_TIMEOUT
-    ) -> Dict[int, PortScanData]:
+    ) -> Mapping[int, PortScanData]:
         return network_scanning.scan_tcp_ports(host, ports, timeout)
 
     def fingerprint(
@@ -57,7 +58,9 @@ class Puppet(IPuppet):
         options: Dict,
     ) -> FingerprintData:
         try:
-            fingerprinter = self._plugin_registry.get_plugin(name, PluginType.FINGERPRINTER)
+            fingerprinter: IFingerprinter = self._plugin_registry.get_plugin(
+                name, PluginType.FINGERPRINTER
+            )
             return fingerprinter.get_host_fingerprint(host, ping_scan_data, port_scan_data, options)
         except Exception:
             logger.exception(

monkey/infection_monkey/utils/capture_output.py

@@ -7,7 +7,6 @@ class StdoutCapture:
         self._orig_stdout = sys.stdout
         self._new_stdout = io.StringIO()
         sys.stdout = self._new_stdout
-        return self
 
     def get_captured_stdout_output(self) -> str:
         self._new_stdout.seek(0)

monkey/monkey_island/cc/app.py

@@ -2,7 +2,7 @@ import os
 import re
 import uuid
 from datetime import timedelta
-from typing import Iterable, Type
+from typing import Iterable, Set, Type
 
 import flask_restful
 from flask import Flask, Response, send_from_directory
@@ -120,7 +120,7 @@ class FlaskDIWrapper:
     def __init__(self, api: flask_restful.Api, container: DIContainer):
         self._api = api
         self._container = container
-        self._reserved_urls = set()
+        self._reserved_urls: Set[str] = set()
 
     def add_resource(self, resource: Type[AbstractResource]):
         if len(resource.urls) == 0:

monkey/monkey_island/cc/models/networkmap.py

@@ -1,6 +1,14 @@
 from dataclasses import dataclass
 from typing import Mapping, Sequence
 
+from monkey_island.cc.models import Machine
+
+
+@dataclass
+class Arc:
+    dst_machine: Machine  # noqa: F821
+    status: str
+
 
 # This is the most concise way to represent a graph:
 # Machine id as key, Arch list as a value
@@ -9,9 +17,3 @@ from typing import Mapping, Sequence
 @dataclass
 class NetworkMap:
     nodes: Mapping[str, Sequence[Arc]]  # noqa: F821
-
-
-@dataclass
-class Arc:
-    dst_machine: Machine  # noqa: F821
-    status: str

monkey/monkey_island/cc/repository/i_log_repository.py

@@ -2,8 +2,12 @@ from abc import ABC
 from typing import Optional, Sequence
 
 
+# TODO: Actually define the Log class
+class Log:
+    pass
+
+
 class ILogRepository(ABC):
-    # Define log object
     def get_logs(self, agent_id: Optional[str] = None) -> Sequence[Log]:  # noqa: F821
         pass
 

monkey/monkey_island/cc/resources/AbstractResource.py

@@ -1,6 +1,8 @@
+from typing import List
+
 import flask_restful
 
 
 # The purpose of this class is to decouple resources from flask
 class AbstractResource(flask_restful.Resource):
-    urls = []
+    urls: List[str] = []

monkey/monkey_island/cc/resources/version.py

@@ -1,6 +1,6 @@
 import logging
 
-from monkey_island.cc import Version
+from monkey_island.cc import Version as IslandVersion
 from monkey_island.cc.resources.AbstractResource import AbstractResource
 from monkey_island.cc.resources.request_authentication import jwt_required
 
@@ -10,7 +10,7 @@ logger = logging.getLogger(__name__)
 class Version(AbstractResource):
     urls = ["/api/island/version"]
 
-    def __init__(self, version: Version):
+    def __init__(self, version: IslandVersion):
         self._version = version
 
     @jwt_required

monkey/monkey_island/cc/server_setup.py

@@ -4,7 +4,7 @@ import logging
 import sys
 from pathlib import Path
 from threading import Thread
-from typing import Sequence, Tuple
+from typing import Optional, Sequence, Tuple
 
 import gevent.hub
 import requests
@@ -151,7 +151,7 @@ def _start_mongodb(data_dir: Path) -> MongoDbProcess:
     return mongo_db_process
 
 
-def _connect_to_mongodb(mongo_db_process: MongoDbProcess):
+def _connect_to_mongodb(mongo_db_process: Optional[MongoDbProcess]):
     try:
         mongo_setup.connect_to_mongodb(MONGO_CONNECTION_TIMEOUT)
     except mongo_setup.MongoDBTimeOutError as err:

monkey/monkey_island/cc/server_utils/encryption/data_store_encryptor.py

@@ -1,7 +1,7 @@
 import os
 import secrets
 from pathlib import Path
-from typing import Union
+from typing import Optional
 
 from monkey_island.cc.server_utils.encryption.encryption_key_types import EncryptionKey32Bytes
 from monkey_island.cc.server_utils.file_utils import open_new_securely_permissioned_file
@@ -12,7 +12,7 @@ from .password_based_bytes_encryptor import PasswordBasedBytesEncryptor
 
 _KEY_FILE_NAME = "mongo_key.bin"
 
-_encryptor: Union[None, IEncryptor] = None
+_encryptor: Optional[IEncryptor] = None
 
 
 # NOTE: This class is being replaced by RepositoryEncryptor
@@ -73,5 +73,5 @@ def _initialize_datastore_encryptor(key_file: Path, secret: str):
     _encryptor = DataStoreEncryptor(secret, key_file)
 
 
-def get_datastore_encryptor() -> IEncryptor:
+def get_datastore_encryptor() -> Optional[IEncryptor]:
     return _encryptor

monkey/monkey_island/cc/server_utils/encryption/repository_encryptor.py

@@ -1,10 +1,11 @@
 import secrets
 from pathlib import Path
+from typing import Optional
 
 from monkey_island.cc.server_utils.encryption.encryption_key_types import EncryptionKey32Bytes
 from monkey_island.cc.server_utils.file_utils import open_new_securely_permissioned_file
 
-from . import ILockableEncryptor, LockedKeyError, ResetKeyError, UnlockError
+from . import IEncryptor, ILockableEncryptor, LockedKeyError, ResetKeyError, UnlockError
 from .key_based_encryptor import KeyBasedEncryptor
 from .password_based_bytes_encryptor import PasswordBasedBytesEncryptor
 
@@ -12,33 +13,32 @@ from .password_based_bytes_encryptor import PasswordBasedBytesEncryptor
 class RepositoryEncryptor(ILockableEncryptor):
     def __init__(self, key_file: Path):
         self._key_file = key_file
-        self._password_based_encryptor = None
-        self._key_based_encryptor = None
+        self._key_based_encryptor: Optional[IEncryptor] = None
 
     def unlock(self, secret: bytes):
         try:
-            self._password_based_encryptor = PasswordBasedBytesEncryptor(secret.decode())
-            self._key_based_encryptor = self._initialize_key_based_encryptor()
+            encryptor = PasswordBasedBytesEncryptor(secret.decode())
+            self._key_based_encryptor = self._initialize_key_based_encryptor(encryptor)
         except Exception as err:
             raise UnlockError(err)
 
-    def _initialize_key_based_encryptor(self):
+    def _initialize_key_based_encryptor(self, encryptor: IEncryptor) -> KeyBasedEncryptor:
         if self._key_file.is_file():
-            return self._load_key()
+            return self._load_key(encryptor)
 
-        return self._create_key()
+        return self._create_key(encryptor)
 
-    def _load_key(self) -> KeyBasedEncryptor:
+    def _load_key(self, encryptor: IEncryptor) -> KeyBasedEncryptor:
         with open(self._key_file, "rb") as f:
             encrypted_key = f.read()
 
-        plaintext_key = EncryptionKey32Bytes(self._password_based_encryptor.decrypt(encrypted_key))
+        plaintext_key = EncryptionKey32Bytes(encryptor.decrypt(encrypted_key))
         return KeyBasedEncryptor(plaintext_key)
 
-    def _create_key(self) -> KeyBasedEncryptor:
+    def _create_key(self, encryptor: IEncryptor) -> KeyBasedEncryptor:
         plaintext_key = EncryptionKey32Bytes(secrets.token_bytes(32))
 
-        encrypted_key = self._password_based_encryptor.encrypt(plaintext_key)
+        encrypted_key = encryptor.encrypt(plaintext_key)
         with open_new_securely_permissioned_file(str(self._key_file), "wb") as f:
             f.write(encrypted_key)
 
@@ -54,7 +54,6 @@ class RepositoryEncryptor(ILockableEncryptor):
         except Exception as err:
             raise ResetKeyError(err)
 
-        self._password_based_encryptor = None
         self._key_based_encryptor = None
 
     def encrypt(self, plaintext: bytes) -> bytes:

monkey/monkey_island/cc/services/attack/technique_reports/T1065.py

@@ -25,4 +25,8 @@ class T1065(AttackTechnique):
     @staticmethod
     def get_tunnel_ports() -> Sequence[str]:
         telems = Telemetry.objects(telem_category="tunnel", data__proxy__ne=None)
-        return [address_to_ip_port(telem["data"]["proxy"])[1] for telem in telems]
+        return [
+            p
+            for p in (address_to_ip_port(telem["data"]["proxy"])[1] for telem in telems)
+            if p is not None
+        ]

monkey/monkey_island/cc/services/ransomware/ransomware_report.py

@@ -18,8 +18,8 @@ def get_propagation_stats() -> Dict:
     }
 
 
-def _get_exploit_counts(exploited: List[MonkeyExploitation]) -> Dict:
-    exploit_counts = {}
+def _get_exploit_counts(exploited: List[MonkeyExploitation]) -> Dict[str, int]:
+    exploit_counts: Dict[str, int] = {}
 
     for node in exploited:
         for exploit in node.exploits:

monkey/monkey_island/cc/services/reporting/issue_processing/exploit_processing/processors/cred_exploit.py

@@ -16,12 +16,12 @@ class CredExploitProcessor:
             if attempt["result"]:
                 exploit_info.username = attempt["user"]
                 if attempt["password"]:
-                    exploit_info.credential_type = CredentialType.PASSWORD.value
+                    exploit_info.credential_type = CredentialType.PASSWORD
                     exploit_info.password = attempt["password"]
                 elif attempt["ssh_key"]:
-                    exploit_info.credential_type = CredentialType.KEY.value
+                    exploit_info.credential_type = CredentialType.KEY
                     exploit_info.ssh_key = attempt["ssh_key"]
                 else:
-                    exploit_info.credential_type = CredentialType.HASH.value
+                    exploit_info.credential_type = CredentialType.HASH
                 return exploit_info
         return exploit_info

monkey/monkey_island/cc/services/telemetry/processing/exploit.py

@@ -1,6 +1,6 @@
 import copy
 
-import dateutil
+from dateutil import parser as dateutil_parser
 
 from monkey_island.cc.models import Monkey
 from monkey_island.cc.server_utils.encryption import get_datastore_encryptor
@@ -29,10 +29,10 @@ def process_exploit_telemetry(telemetry_json, _):
 
 
 def update_network_with_exploit(edge: EdgeService, telemetry_json):
-    telemetry_json["data"]["info"]["started"] = dateutil.parser.parse(
+    telemetry_json["data"]["info"]["started"] = dateutil_parser.parse(
         telemetry_json["data"]["info"]["started"]
     )
-    telemetry_json["data"]["info"]["finished"] = dateutil.parser.parse(
+    telemetry_json["data"]["info"]["finished"] = dateutil_parser.parse(
         telemetry_json["data"]["info"]["finished"]
     )
     new_exploit = copy.deepcopy(telemetry_json["data"])

monkey/monkey_island/cc/services/telemetry/zero_trust_checks/segmentation.py

@@ -67,6 +67,8 @@ def is_segmentation_violation(
 
         return cross_segment_ip is not None
 
+    return False
+
 
 def get_segmentation_violation_event(current_monkey, source_subnet, target_ip, target_subnet):
     return Event.create_event(

monkey/monkey_island/cc/services/zero_trust/zero_trust_report/finding_service.py

@@ -1,5 +1,5 @@
 from dataclasses import dataclass
-from typing import List, Union
+from typing import Dict, List, Union, cast
 
 from bson import SON
 
@@ -30,21 +30,26 @@ class FindingService:
     @staticmethod
     def get_all_findings_for_ui() -> List[EnrichedFinding]:
         findings = FindingService.get_all_findings_from_db()
-        for i in range(len(findings)):
-            details = FindingService._get_finding_details(findings[i])
-            findings[i] = findings[i].to_mongo()
-            findings[i] = FindingService._get_enriched_finding(findings[i])
-            findings[i].details = details
-        return findings
+        enriched_findings: List[EnrichedFinding] = []
+        for finding in findings:
+            finding_data = finding.to_mongo()
+            enriched_finding = FindingService._get_enriched_finding(finding_data)
+            details = FindingService._get_finding_details(finding)
+            enriched_finding.details = details
+            enriched_findings.append(enriched_finding)
+
+        return enriched_findings
 
     @staticmethod
-    def _get_enriched_finding(finding: Finding) -> EnrichedFinding:
+    def _get_enriched_finding(finding: SON) -> EnrichedFinding:
         test_info = zero_trust_consts.TESTS_MAP[finding["test"]]
         enriched_finding = EnrichedFinding(
             finding_id=str(finding["_id"]),
-            test=test_info[zero_trust_consts.FINDING_EXPLANATION_BY_STATUS_KEY][finding["status"]],
+            test=cast(
+                Dict[str, str], test_info[zero_trust_consts.FINDING_EXPLANATION_BY_STATUS_KEY]
+            )[finding["status"]],
             test_key=finding["test"],
-            pillars=test_info[zero_trust_consts.PILLARS_KEY],
+            pillars=cast(List[str], test_info[zero_trust_consts.PILLARS_KEY]),
             status=finding["status"],
             details=None,
         )

monkey/monkey_island/cc/setup/mongo/mongo_db_process.py

@@ -49,7 +49,7 @@ class MongoDbProcess:
             self._process.kill()
 
     def is_running(self) -> bool:
-        if self._process.poll() is None:
+        if self._process and self._process.poll() is None:
             return True
 
         return False

monkey/tests/unit_tests/infection_monkey/master/mock_puppet.py

@@ -77,14 +77,14 @@ class MockPuppet(IPuppet):
     ) -> Dict[int, PortScanData]:
         logger.debug(f"run_scan_tcp_port({host}, {ports}, {timeout})")
         dot_1_results = {
-            22: PortScanData(22, PortStatus.CLOSED, None, None),
+            22: PortScanData(22, PortStatus.CLOSED, "", ""),
             445: PortScanData(445, PortStatus.OPEN, "SMB BANNER", "tcp-445"),
             3389: PortScanData(3389, PortStatus.OPEN, "", "tcp-3389"),
         }
         dot_3_results = {
             22: PortScanData(22, PortStatus.OPEN, "SSH BANNER", "tcp-22"),
             443: PortScanData(443, PortStatus.OPEN, "HTTPS BANNER", "tcp-443"),
-            3389: PortScanData(3389, PortStatus.CLOSED, "", None),
+            3389: PortScanData(3389, PortStatus.CLOSED, "", ""),
         }
 
         if host == DOT_1:
@@ -104,7 +104,7 @@ class MockPuppet(IPuppet):
         options: Dict,
     ) -> FingerprintData:
         logger.debug(f"fingerprint({name}, {host})")
-        empty_fingerprint_data = FingerprintData(None, None, {})
+        empty_fingerprint_data = FingerprintData(None, "", {})
 
         dot_1_results = {
             "SMBFinger": FingerprintData(
@@ -118,7 +118,7 @@ class MockPuppet(IPuppet):
             ),
             "HTTPFinger": FingerprintData(
                 None,
-                None,
+                "",
                 {
                     "tcp-80": {"name": "http", "data": ("SERVER_HEADERS", False)},
                     "tcp-443": {"name": "http", "data": ("SERVER_HEADERS_2", True)},
@@ -248,4 +248,4 @@ class MockPuppet(IPuppet):
 
 
 def _get_empty_results(port: int):
-    return PortScanData(port, PortStatus.CLOSED, None, None)
+    return PortScanData(port, PortStatus.CLOSED, "", "")

monkey/tests/unit_tests/infection_monkey/master/test_ip_scanner.py

@@ -154,7 +154,7 @@ def assert_fingerprint_results_no_3(fingerprint_data):
 
 def assert_scan_results_host_down(address, ping_scan_data, port_scan_data, fingerprint_data):
     assert address.ip not in {"10.0.0.1", "10.0.0.3"}
-    assert address.domain is None
+    assert not address.domain
 
     assert ping_scan_data.response_received is False
     assert len(port_scan_data.keys()) == 6
@@ -178,9 +178,9 @@ def test_scan_single_ip(callback, scan_config, stop):
 def test_scan_multiple_ips(callback, scan_config, stop):
     addresses = [
         NetworkAddress("10.0.0.1", "d1"),
-        NetworkAddress("10.0.0.2", None),
+        NetworkAddress("10.0.0.2", ""),
         NetworkAddress("10.0.0.3", "d3"),
-        NetworkAddress("10.0.0.4", None),
+        NetworkAddress("10.0.0.4", ""),
     ]
 
     ns = IPScanner(MockPuppet(), num_workers=4)
@@ -203,7 +203,7 @@ def test_scan_multiple_ips(callback, scan_config, stop):
 
 @pytest.mark.slow
 def test_scan_lots_of_ips(callback, scan_config, stop):
-    addresses = [NetworkAddress(f"10.0.0.{i}", None) for i in range(0, 255)]
+    addresses = [NetworkAddress(f"10.0.0.{i}", "") for i in range(0, 255)]
 
     ns = IPScanner(MockPuppet(), num_workers=4)
     ns.scan(addresses, scan_config, callback, stop)
@@ -223,10 +223,10 @@ def test_stop_after_callback(scan_config, stop):
     stoppable_callback = MagicMock(side_effect=_callback)
 
     addresses = [
-        NetworkAddress("10.0.0.1", None),
-        NetworkAddress("10.0.0.2", None),
-        NetworkAddress("10.0.0.3", None),
-        NetworkAddress("10.0.0.4", None),
+        NetworkAddress("10.0.0.1", ""),
+        NetworkAddress("10.0.0.2", ""),
+        NetworkAddress("10.0.0.3", ""),
+        NetworkAddress("10.0.0.4", ""),
     ]
 
     ns = IPScanner(MockPuppet(), num_workers=2)
@@ -251,10 +251,10 @@ def test_interrupt_before_fingerprinting(callback, scan_config, stop):
     puppet.fingerprint = MagicMock()
 
     addresses = [
-        NetworkAddress("10.0.0.1", None),
-        NetworkAddress("10.0.0.2", None),
-        NetworkAddress("10.0.0.3", None),
-        NetworkAddress("10.0.0.4", None),
+        NetworkAddress("10.0.0.1", ""),
+        NetworkAddress("10.0.0.2", ""),
+        NetworkAddress("10.0.0.3", ""),
+        NetworkAddress("10.0.0.4", ""),
     ]
 
     ns = IPScanner(puppet, num_workers=2)
@@ -270,7 +270,7 @@ def test_interrupt_fingerprinting(callback, scan_config, stop):
         stoppable_fingerprint.barrier.wait()
         stop.set()
 
-        return FingerprintData(None, None, {})
+        return FingerprintData(None, "", {})
 
     stoppable_fingerprint.barrier = Barrier(2)
 
@@ -278,10 +278,10 @@ def test_interrupt_fingerprinting(callback, scan_config, stop):
     puppet.fingerprint = MagicMock(side_effect=stoppable_fingerprint)
 
     addresses = [
-        NetworkAddress("10.0.0.1", None),
-        NetworkAddress("10.0.0.2", None),
-        NetworkAddress("10.0.0.3", None),
-        NetworkAddress("10.0.0.4", None),
+        NetworkAddress("10.0.0.1", ""),
+        NetworkAddress("10.0.0.2", ""),
+        NetworkAddress("10.0.0.3", ""),
+        NetworkAddress("10.0.0.4", ""),
     ]
 
     ns = IPScanner(puppet, num_workers=2)

monkey/tests/unit_tests/infection_monkey/master/test_propagator.py

@@ -35,12 +35,12 @@ def mock_victim_host_factory():
     return MockVictimHostFactory()
 
 
-empty_fingerprint_data = FingerprintData(None, None, {})
+empty_fingerprint_data = FingerprintData(None, "", {})
 
 dot_1_scan_results = IPScanResults(
     PingScanData(True, "windows"),
     {
-        22: PortScanData(22, PortStatus.CLOSED, None, None),
+        22: PortScanData(22, PortStatus.CLOSED, "", ""),
         445: PortScanData(445, PortStatus.OPEN, "SMB BANNER", "tcp-445"),
         3389: PortScanData(3389, PortStatus.OPEN, "", "tcp-3389"),
     },
@@ -56,7 +56,7 @@ dot_3_scan_results = IPScanResults(
     {
         22: PortScanData(22, PortStatus.OPEN, "SSH BANNER", "tcp-22"),
         443: PortScanData(443, PortStatus.OPEN, "HTTPS BANNER", "tcp-443"),
-        3389: PortScanData(3389, PortStatus.CLOSED, "", None),
+        3389: PortScanData(3389, PortStatus.CLOSED, "", ""),
     },
     {
         "SSHFinger": FingerprintData(
@@ -64,7 +64,7 @@ dot_3_scan_results = IPScanResults(
         ),
         "HTTPFinger": FingerprintData(
             None,
-            None,
+            "",
             {
                 "tcp-80": {"name": "http", "data": ("SERVER_HEADERS", False)},
                 "tcp-443": {"name": "http", "data": ("SERVER_HEADERS_2", True)},
@@ -77,9 +77,9 @@ dot_3_scan_results = IPScanResults(
 dead_host_scan_results = IPScanResults(
     PingScanData(False, None),
     {
-        22: PortScanData(22, PortStatus.CLOSED, None, None),
-        443: PortScanData(443, PortStatus.CLOSED, None, None),
-        3389: PortScanData(3389, PortStatus.CLOSED, "", None),
+        22: PortScanData(22, PortStatus.CLOSED, "", ""),
+        443: PortScanData(443, PortStatus.CLOSED, "", ""),
+        3389: PortScanData(3389, PortStatus.CLOSED, "", ""),
     },
     {},
 )

monkey/tests/unit_tests/infection_monkey/model/test_victim_host_factory.py

@@ -13,7 +13,7 @@ def mock_get_interface_to_target(monkeypatch):
 
 def test_factory_no_tunnel():
     factory = VictimHostFactory(island_ip="192.168.56.1", island_port="5000", on_island=False)
-    network_address = NetworkAddress("192.168.56.2", None)
+    network_address = NetworkAddress("192.168.56.2", "")
 
     victim = factory.build_victim_host(network_address)
 
@@ -49,4 +49,4 @@ def test_factory_no_default_server():
 
     victim = factory.build_victim_host(network_address)
 
-    assert victim.default_server is None
+    assert not victim.default_server

monkey/tests/unit_tests/infection_monkey/network_scanning/test_elasticsearch_fingerprinter.py

@@ -38,7 +38,7 @@ def test_successful(monkeypatch, fingerprinter):
     )
 
     assert fingerprint_data.os_type is None
-    assert fingerprint_data.os_version is None
+    assert not fingerprint_data.os_version
     assert len(fingerprint_data.services.keys()) == 1
 
     es_service = fingerprint_data.services[ES_SERVICE]
@@ -60,7 +60,7 @@ def test_fingerprinting_skipped_if_port_closed(monkeypatch, fingerprinter, port_
 
     assert not mock_query_elasticsearch.called
     assert fingerprint_data.os_type is None
-    assert fingerprint_data.os_version is None
+    assert not fingerprint_data.os_version
     assert len(fingerprint_data.services.keys()) == 0
 
 
@@ -82,5 +82,5 @@ def test_no_response_from_server(monkeypatch, fingerprinter, mock_query_function
     )
 
     assert fingerprint_data.os_type is None
-    assert fingerprint_data.os_version is None
+    assert not fingerprint_data.os_version
     assert len(fingerprint_data.services.keys()) == 0

monkey/tests/unit_tests/infection_monkey/network_scanning/test_http_fingerprinter.py

@@ -63,7 +63,7 @@ def test_fingerprint_only_port_443(mock_get_http_headers, http_fingerprinter):
     mock_get_http_headers.assert_called_with("https://127.0.0.1:443")
 
     assert fingerprint_data.os_type is None
-    assert fingerprint_data.os_version is None
+    assert not fingerprint_data.os_version
     assert len(fingerprint_data.services.keys()) == 1
 
     assert fingerprint_data.services["tcp-443"]["data"][0] == PYTHON_SERVER_HEADER["Server"]
@@ -86,7 +86,7 @@ def test_open_port_no_http_server(mock_get_http_headers, http_fingerprinter):
     mock_get_http_headers.assert_any_call("http://127.0.0.1:9200")
 
     assert fingerprint_data.os_type is None
-    assert fingerprint_data.os_version is None
+    assert not fingerprint_data.os_version
     assert len(fingerprint_data.services.keys()) == 0
 
 
@@ -106,7 +106,7 @@ def test_multiple_open_ports(mock_get_http_headers, http_fingerprinter):
     mock_get_http_headers.assert_any_call("http://127.0.0.1:8080")
 
     assert fingerprint_data.os_type is None
-    assert fingerprint_data.os_version is None
+    assert not fingerprint_data.os_version
     assert len(fingerprint_data.services.keys()) == 2
 
     assert fingerprint_data.services["tcp-443"]["data"][0] == PYTHON_SERVER_HEADER["Server"]
@@ -126,7 +126,7 @@ def test_server_missing_from_http_headers(mock_get_http_headers, http_fingerprin
     assert mock_get_http_headers.call_count == 2
 
     assert fingerprint_data.os_type is None
-    assert fingerprint_data.os_version is None
+    assert not fingerprint_data.os_version
     assert len(fingerprint_data.services.keys()) == 1
 
     assert fingerprint_data.services["tcp-1080"]["data"][0] == ""

monkey/tests/unit_tests/infection_monkey/network_scanning/test_mssql_fingerprinter.py

@@ -45,7 +45,7 @@ def test_mssql_fingerprint_successful(monkeypatch, fingerprinter):
     )
 
     assert fingerprint_data.os_type is None
-    assert fingerprint_data.os_version is None
+    assert not fingerprint_data.os_version
     assert len(fingerprint_data.services.keys()) == 1
 
     # Each mssql instance is under his name
@@ -78,7 +78,7 @@ def test_mssql_no_response_from_server(monkeypatch, fingerprinter, mock_query_fu
     )
 
     assert fingerprint_data.os_type is None
-    assert fingerprint_data.os_version is None
+    assert not fingerprint_data.os_version
     assert len(fingerprint_data.services.keys()) == 0
 
 
@@ -98,5 +98,5 @@ def test_mssql_wrong_response_from_server(monkeypatch, fingerprinter):
     )
 
     assert fingerprint_data.os_type is None
-    assert fingerprint_data.os_version is None
+    assert not fingerprint_data.os_version
     assert len(fingerprint_data.services.keys()) == 0

monkey/tests/unit_tests/infection_monkey/network_scanning/test_scan_target_generator.py

@@ -24,7 +24,7 @@ def test_single_subnet():
     assert len(scan_targets) == 255
 
     for i in range(0, 255):
-        assert NetworkAddress(f"10.0.0.{i}", None) in scan_targets
+        assert NetworkAddress(f"10.0.0.{i}", "") in scan_targets
 
 
 @pytest.mark.parametrize("single_ip", ["10.0.0.2", "10.0.0.2/32", "10.0.0.2-10.0.0.2"])
@@ -33,8 +33,8 @@ def test_single_ip(single_ip):
     scan_targets = compile_ranges_only([single_ip])
 
     assert len(scan_targets) == 1
-    assert NetworkAddress("10.0.0.2", None) in scan_targets
-    assert NetworkAddress("10.0.0.2", None) == scan_targets[0]
+    assert NetworkAddress("10.0.0.2", "") in scan_targets
+    assert NetworkAddress("10.0.0.2", "") == scan_targets[0]
 
 
 def test_multiple_subnet():
@@ -43,10 +43,10 @@ def test_multiple_subnet():
     assert len(scan_targets) == 262
 
     for i in range(0, 255):
-        assert NetworkAddress(f"10.0.0.{i}", None) in scan_targets
+        assert NetworkAddress(f"10.0.0.{i}", "") in scan_targets
 
     for i in range(8, 15):
-        assert NetworkAddress(f"192.168.56.{i}", None) in scan_targets
+        assert NetworkAddress(f"192.168.56.{i}", "") in scan_targets
 
 
 def test_middle_of_range_subnet():
@@ -55,7 +55,7 @@ def test_middle_of_range_subnet():
     assert len(scan_targets) == 7
 
     for i in range(0, 7):
-        assert NetworkAddress(f"192.168.56.{i}", None) in scan_targets
+        assert NetworkAddress(f"192.168.56.{i}", "") in scan_targets
 
 
 @pytest.mark.parametrize(
@@ -68,7 +68,7 @@ def test_ip_range(ip_range):
     assert len(scan_targets) == 9
 
     for i in range(25, 34):
-        assert NetworkAddress(f"192.168.56.{i}", None) in scan_targets
+        assert NetworkAddress(f"192.168.56.{i}", "") in scan_targets
 
 
 def test_no_duplicates():
@@ -77,7 +77,7 @@ def test_no_duplicates():
     assert len(scan_targets) == 7
 
     for i in range(0, 7):
-        assert NetworkAddress(f"192.168.56.{i}", None) in scan_targets
+        assert NetworkAddress(f"192.168.56.{i}", "") in scan_targets
 
 
 def test_blocklisted_ips():
@@ -146,7 +146,7 @@ def test_no_redundant_targets():
     )
 
     assert len(scan_targets) == 2
-    assert NetworkAddress(ip="127.0.0.0", domain=None) in scan_targets
+    assert NetworkAddress(ip="127.0.0.0", domain="") in scan_targets
     assert NetworkAddress(ip="127.0.0.1", domain="localhost") in scan_targets
 
 
@@ -212,7 +212,7 @@ def test_local_subnet_added():
     assert len(scan_targets) == 254
 
     for ip in chain(range(0, 5), range(6, 255)):
-        assert NetworkAddress(f"10.0.0.{ip}", None) in scan_targets
+        assert NetworkAddress(f"10.0.0.{ip}", "") in scan_targets
 
 
 def test_multiple_local_subnets_added():
@@ -232,10 +232,10 @@ def test_multiple_local_subnets_added():
     assert len(scan_targets) == 2 * (255 - 1)
 
     for ip in chain(range(0, 5), range(6, 255)):
-        assert NetworkAddress(f"10.0.0.{ip}", None) in scan_targets
+        assert NetworkAddress(f"10.0.0.{ip}", "") in scan_targets
 
     for ip in chain(range(0, 99), range(100, 255)):
-        assert NetworkAddress(f"172.33.66.{ip}", None) in scan_targets
+        assert NetworkAddress(f"172.33.66.{ip}", "") in scan_targets
 
 
 def test_blocklisted_ips_missing_from_local_subnets():
@@ -273,12 +273,12 @@ def test_local_subnets_and_ranges_added():
     assert len(scan_targets) == 254 + 3
 
     for ip in range(0, 5):
-        assert NetworkAddress(f"10.0.0.{ip}", None) in scan_targets
+        assert NetworkAddress(f"10.0.0.{ip}", "") in scan_targets
     for ip in range(6, 255):
-        assert NetworkAddress(f"10.0.0.{ip}", None) in scan_targets
+        assert NetworkAddress(f"10.0.0.{ip}", "") in scan_targets
 
     for ip in range(40, 43):
-        assert NetworkAddress(f"172.33.66.{ip}", None) in scan_targets
+        assert NetworkAddress(f"172.33.66.{ip}", "") in scan_targets
 
 
 def test_local_network_interfaces_specified_but_disabled():
@@ -295,7 +295,7 @@ def test_local_network_interfaces_specified_but_disabled():
     assert len(scan_targets) == 3
 
     for ip in range(40, 43):
-        assert NetworkAddress(f"172.33.66.{ip}", None) in scan_targets
+        assert NetworkAddress(f"172.33.66.{ip}", "") in scan_targets
 
 
 def test_local_network_interfaces_subnet_masks():
@@ -315,7 +315,7 @@ def test_local_network_interfaces_subnet_masks():
     assert len(scan_targets) == 4
 
     for ip in [108, 110, 145, 146]:
-        assert NetworkAddress(f"172.60.145.{ip}", None) in scan_targets
+        assert NetworkAddress(f"172.60.145.{ip}", "") in scan_targets
 
 
 def test_segmentation_targets():
@@ -334,7 +334,7 @@ def test_segmentation_targets():
     assert len(scan_targets) == 3
 
     for ip in [144, 145, 146]:
-        assert NetworkAddress(f"172.60.145.{ip}", None) in scan_targets
+        assert NetworkAddress(f"172.60.145.{ip}", "") in scan_targets
 
 
 def test_segmentation_clash_with_blocked():
@@ -377,7 +377,7 @@ def test_segmentation_clash_with_targets():
     assert len(scan_targets) == 3
 
     for ip in [148, 149, 150]:
-        assert NetworkAddress(f"172.60.145.{ip}", None) in scan_targets
+        assert NetworkAddress(f"172.60.145.{ip}", "") in scan_targets
 
 
 def test_segmentation_one_network():
@@ -443,7 +443,7 @@ def test_invalid_inputs():
     assert len(scan_targets) == 3
 
     for ip in [148, 149, 150]:
-        assert NetworkAddress(f"172.60.145.{ip}", None) in scan_targets
+        assert NetworkAddress(f"172.60.145.{ip}", "") in scan_targets
 
 
 def test_invalid_blocklisted_ip():

monkey/tests/unit_tests/infection_monkey/network_scanning/test_ssh_fingerprinter.py

@@ -18,7 +18,7 @@ def test_no_ssh_ports_open(ssh_fingerprinter):
     }
     results = ssh_fingerprinter.get_host_fingerprint("127.0.0.1", None, port_scan_data, None)
 
-    assert results == FingerprintData(None, None, {})
+    assert results == FingerprintData(None, "", {})
 
 
 def test_no_os(ssh_fingerprinter):
@@ -32,7 +32,7 @@ def test_no_os(ssh_fingerprinter):
 
     assert results == FingerprintData(
         None,
-        None,
+        "",
         {
             "tcp-22": {
                 "display_name": "SSH",

monkey/tests/unit_tests/infection_monkey/network_scanning/test_tcp_scanner.py

@@ -34,7 +34,7 @@ def test_tcp_successful(monkeypatch, patch_check_tcp_ports, open_ports_data):
     for port in closed_ports:
         assert port_scan_data[port].port == port
         assert port_scan_data[port].status == PortStatus.CLOSED
-        assert port_scan_data[port].banner is None
+        assert not port_scan_data[port].banner
 
 
 @pytest.mark.parametrize("open_ports_data", [{}])

monkey/tests/unit_tests/infection_monkey/telemetry/test_exploit_telem.py

@@ -1,11 +1,12 @@
 import json
+from typing import Iterable
 
 import pytest
 
 from infection_monkey.exploit.sshexec import SSHExploiter
+from infection_monkey.i_puppet.i_puppet import ExploiterResultData
 from infection_monkey.model.host import VictimHost
 from infection_monkey.telemetry.exploit_telem import ExploitTelem
-from monkey.infection_monkey.i_puppet.i_puppet import ExploiterResultData
 
 DOMAIN_NAME = "domain-name"
 IP = "0.0.0.0"
@@ -16,7 +17,7 @@ HOST_AS_DICT = {
     "os": {},
     "services": {},
     "icmp": False,
-    "default_server": None,
+    "default_server": "",
 }
 EXPLOITER_NAME = "SSHExploiter"
 EXPLOITER_INFO = {
@@ -27,7 +28,7 @@ EXPLOITER_INFO = {
     "vulnerable_ports": [],
     "executed_cmds": [],
 }
-EXPLOITER_ATTEMPTS = []
+EXPLOITER_ATTEMPTS: Iterable = []
 RESULT = False
 OS_LINUX = "linux"
 ERROR_MSG = "failed because yolo"

monkey/tests/unit_tests/infection_monkey/telemetry/test_scan_telem.py

@@ -1,4 +1,5 @@
 import json
+from typing import Any, Dict
 
 import pytest
 
@@ -14,9 +15,9 @@ HOST_AS_DICT = {
     "os": {},
     "services": {},
     "icmp": False,
-    "default_server": None,
+    "default_server": "",
 }
-HOST_SERVICES = {}
+HOST_SERVICES: Dict[str, Any] = {}
 
 
 @pytest.fixture

monkey/tests/unit_tests/monkey_island/cc/services/edge/test_displayed_edge_service.py

@@ -18,7 +18,7 @@ SCAN_DATA_MOCK = [
                 },
             },
             "monkey_exe": None,
-            "default_server": None,
+            "default_server": "",
         },
     }
 ]