Island: Add "/legacy" config format option to monkey config endpoint

The schema of the configuration that is given to the agent when it
requests configuration from the island is heavily influenced by the GUI
and how configuration options should be displayed to the user. It is not
formatted in a way that is easy for the agent to utilize. This commit
adds a `/api/monkey/<string:guid>/<string:config_format>` endpoint that
allows legacy code to continue to function, while the agent's new
AutomatedMaster component (issue #1597) can receive configuration in a
way that makes sense for the agent.

monkey/monkey_island/cc/app.py

@@ -122,7 +122,13 @@ def init_api_resources(api):
     api.add_resource(Root, "/api")
     api.add_resource(Registration, "/api/registration")
     api.add_resource(Authenticate, "/api/auth")
-    api.add_resource(Monkey, "/api/monkey", "/api/monkey/", "/api/monkey/<string:guid>")
+    api.add_resource(
+        Monkey,
+        "/api/monkey",
+        "/api/monkey/",
+        "/api/monkey/<string:guid>",
+        "/api/monkey/<string:guid>/<string:config_format>",
+    )
     api.add_resource(Bootloader, "/api/bootloader/<string:os>")
     api.add_resource(LocalRun, "/api/local-monkey", "/api/local-monkey/")
     api.add_resource(ClientRun, "/api/client-monkey", "/api/client-monkey/")

monkey/monkey_island/cc/resources/monkey.py

@@ -19,14 +19,20 @@ from monkey_island.cc.services.node import NodeService
 class Monkey(flask_restful.Resource):
 
     # Used by monkey. can't secure.
-    def get(self, guid=None, **kw):
+    def get(self, guid=None, config_format=None, **kw):
         NodeService.update_dead_monkeys()  # refresh monkeys status
         if not guid:
             guid = request.args.get("guid")
 
         if guid:
             monkey_json = mongo.db.monkey.find_one_or_404({"guid": guid})
-            monkey_json["config"] = ConfigService.decrypt_flat_config(monkey_json["config"])
+            # TODO: When the "legacy" format is no longer needed, update this logic and remove the
+            #       "/api/monkey/<string:guid>/<string:config_format>" route.
+            if config_format == "legacy":
+                ConfigService.decrypt_flat_config(monkey_json["config"])
+            else:
+                ConfigService.format_config_for_agent(monkey_json["config"])
+
             return monkey_json
 
         return {}

monkey/monkey_island/cc/services/config.py

@@ -2,6 +2,7 @@ import collections
 import copy
 import functools
 import logging
+from typing import Dict
 
 from jsonschema import Draft4Validator, validators
 
@@ -425,3 +426,7 @@ class ConfigService:
             ),
             "exploit_ssh_keys": ConfigService.get_config_value(SSH_KEYS_PATH, should_decrypt=False),
         }
+
+    @staticmethod
+    def format_config_for_agent(config: Dict):
+        ConfigService.decrypt_flat_config(config)