Agent: Encapsulate parallelism in ExploitClassHTTPServer

monkey/infection_monkey/exploit/log4shell.py

@@ -1,5 +1,4 @@
 import logging
-from threading import Thread
 from time import sleep
 
 from common.utils.exploit_enum import ExploitType
@@ -45,7 +44,6 @@ class Log4ShellExploiter(WebRCE):
 
         self._ldap_server = None
         self._exploit_class_http_server = None
-        self._exploit_class_http_server_thread = None
         self._agent_http_server_thread = None
 
     def _exploit_host(self):
@@ -83,14 +81,7 @@ class Log4ShellExploiter(WebRCE):
         self._exploit_class_http_server = ExploitClassHTTPServer(
             self._class_http_server_ip, self._class_http_server_port, java_class
         )
-        # Setting `daemon=True` to save ourselves some trouble when this is merged to the
-        # agent-refactor branch.
-        # TODO: Make a call to `create_daemon_thread()` instead of calling the `Thread()`
-        # constructor directly after merging to the agent-refactor branch.
-        self._exploit_class_http_server_thread = Thread(
-            target=self._exploit_class_http_server.run, daemon=True
-        )
-        self._exploit_class_http_server_thread.start()
+        self._exploit_class_http_server.run()
 
     def _start_ldap_server(self):
         self._ldap_server = LDAPExploitServer(
@@ -99,7 +90,6 @@ class Log4ShellExploiter(WebRCE):
             http_server_port=self._class_http_server_port,
             storage_dir=get_monkey_dir_path(),
         )
-
         self._ldap_server.run()
 
     def _stop_servers(self):

monkey/infection_monkey/exploit/log4shell_utils/exploit_class_http_server.py

@@ -38,6 +38,13 @@ class ExploitClassHTTPServer:
         self._initialize_http_handler(java_class)
 
         self._server = http.server.HTTPServer((ip, port), HTTPHandler)
+        # Setting `daemon=True` to save ourselves some trouble when this is merged to the
+        # agent-refactor branch.
+        # TODO: Make a call to `create_daemon_thread()` instead of calling the `Thread()`
+        # constructor directly after merging to the agent-refactor branch.
+        self._server_thread = threading.Thread(
+            target=self._server.serve_forever, args=(self._poll_interval,), daemon=True
+        )
 
     def _initialize_http_handler(self, java_class: bytes):
         HTTPHandler.java_class = java_class
@@ -47,12 +54,23 @@ class ExploitClassHTTPServer:
         logger.info("Starting ExploitClassHTTPServer")
         self._class_downloaded.clear()
 
-        self._server.serve_forever(self._poll_interval)
-        logger.debug("The Java Exploit class HTTP server has stopped")
+        # NOTE: Unlike in LDAPExploitServer, we theoretically don't need to worry about a race
+        # between when `serve_forever()` is ready to handle requests and when the victim machine
+        # sends its requests. See
+        # https://stackoverflow.com/questions/22606480/how-can-i-test-if-python-http-server-httpserver-is-serving-forever
+        # for more information.
+        self._server_thread.start()
 
-    def stop(self):
-        logger.debug("Stopping the Java Exploit class HTTP server")
-        self._server.shutdown()
+    def stop(self, timeout: float = None):
+        if self._server_thread.is_alive():
+            logger.debug("Stopping the Java Exploit class HTTP server")
+            self._server.shutdown()
+            self._server_thread.join(timeout)
+
+        if self._server_thread.is_alive():
+            logger.warning("Timed out while waiting for The HTTP exploit server to stop")
+        else:
+            logger.debug("The Java Exploit class HTTP server has stopped")
 
     def exploit_class_downloaded(self) -> bool:
         return self._class_downloaded.is_set()

monkey/infection_monkey/exploit/log4shell_utils/ldap_server.py

@@ -179,6 +179,6 @@ class LDAPExploitServer:
             self._server_process.join(timeout)
 
             if self._server_process.is_alive():
-                logger.warning("Timed out while waiting for the LDAP exploit server to stop.")
+                logger.warning("Timed out while waiting for the LDAP exploit server to stop")
             else:
                 logger.debug("Successfully stopped the LDAP exploit server")

monkey/tests/unit_tests/infection_monkey/exploit/log4shell_utils/test_exploit_class_http_server.py

@@ -1,5 +1,3 @@
-import threading
-
 import pytest
 import requests
 
@@ -25,13 +23,11 @@ def java_class():
 @pytest.fixture
 def server(ip, port, java_class):
     server = ExploitClassHTTPServer(ip, port, java_class, 0.01)
-    server_thread = threading.Thread(target=server.run)
-    server_thread.start()
+    server.run()
 
     yield server
 
     server.stop()
-    server_thread.join()
 
 
 @pytest.fixture