WIP checkpoint: Research and design GDScript sandboxing approach

sandbox_probe/probe3.gd

@@ -2,88 +2,80 @@ extends Node
 
 func _ready():
 	print("=== SANDBOX PROBE 3: Deep Sandboxing Mechanisms ===")
-	probe_script_restriction_apis()
-	probe_global_scope()
-	probe_classdb_restrictions()
+	probe_global_scope_restriction()
+	probe_classdb_restriction()
 	probe_engine_singletons()
-	probe_network_restrictions()
-	probe_threading()
-	probe_expression_eval()
-	probe_resource_loading()
+	probe_script_validation()
+	probe_expression_engine()
+	probe_worker_threads()
+	probe_os_restriction_flags()
 	print("=== SANDBOX PROBE 3 END ===")
 	get_tree().quit()
 
-func probe_script_restriction_apis():
-	print("--- Script restriction APIs ---")
-	# Does GDScript expose any way to restrict globals?
-	var gd = GDScript.new()
-	print("  GDScript methods: ", gd.get_method_list().map(func(m): return m.name))
-	# Check for any 'restrict' or 'allow' methods on the language
-	var lang = GDScriptLanguage.new()
-	print("  GDScriptLanguage methods: ", lang.get_method_list().map(func(m): return m.name))
-	# Check ScriptServer via Engine
-	print("  Engine.get_singleton_list contains ScriptServer: ", "ScriptServer" in Engine.get_singleton_list())
-
-func probe_global_scope():
-	print("--- Global scope ---")
-	# What globals are available to a script?
-	# Test if we can enumerate global classes
+func probe_global_scope_restriction():
+	print("--- Global scope restriction ---")
+	# Can we enumerate what's in the global scope?
 	var globals = []
-	for g in GlobalScope.get_singleton_list():
+	for g in GDScript.get_global_class_list():
 		globals.append(g)
-	print("  GlobalScope singletons: ", globals)
-	# Can we access ClassDB to enumerate classes?
+	print("  GDScript.get_global_class_list() count: ", globals.size())
+	# Can we check if a global is available before using it?
+	print("  GDScript has 'get_global_class_list': ", GDScript.has_method("get_global_class_list"))
+	# Is there any way to restrict which globals a script sees?
+	print("  GDScript has 'set_global_scope': ", GDScript.has_method("set_global_scope"))
+	print("  GDScript has 'restrict_globals': ", GDScript.has_method("restrict_globals"))
+	# Check the GDScript class methods
+	var methods = GDScript.get_method_list()
+	var method_names = []
+	for m in methods:
+		method_names.append(m.name)
+	print("  GDScript methods: ", method_names)
+
+func probe_classdb_restriction():
+	print("--- ClassDB restriction ---")
+	# ClassDB is the registry of all engine classes. Can we restrict it?
+	print("  ClassDB has 'get_class_list': ", ClassDB.has_method("get_class_list"))
+	print("  ClassDB has 'class_exists': ", ClassDB.has_method("class_exists"))
+	# Can we check if a specific class is available?
 	print("  ClassDB.class_exists('OS'): ", ClassDB.class_exists("OS"))
 	print("  ClassDB.class_exists('FileAccess'): ", ClassDB.class_exists("FileAccess"))
 	print("  ClassDB.class_exists('TCPServer'): ", ClassDB.class_exists("TCPServer"))
-
-func probe_classdb_restrictions():
-	print("--- ClassDB restrictions ---")
-	# Can we instantiate arbitrary classes?
-	var os = ClassDB.instantiate("OS")
-	print("  ClassDB.instantiate('OS') = ", os)
-	# Can we call static methods via ClassDB?
-	print("  ClassDB has method 'class_get_method_list': ", ClassDB.has_method("class_get_method_list"))
-	# Can we access the full class list?
-	var class_list = ClassDB.get_class_list()
-	print("  ClassDB.get_class_list() count: ", class_list.size())
-	print("  First 10 classes: ", class_list.slice(0, 10))
+	# Is there a way to hide classes from scripts?
+	print("  ClassDB has 'set_class_enabled': ", ClassDB.has_method("set_class_enabled"))
+	print("  ClassDB has 'disable_class': ", ClassDB.has_method("disable_class"))
 
 func probe_engine_singletons():
 	print("--- Engine singletons ---")
-	# What singletons are available?
-	var singletons = Engine.get_singleton_list()
-	print("  Engine singletons: ", singletons)
-	# Can we get a singleton by name?
-	for s in ["OS", "Engine", "ProjectSettings", "ResourceLoader", "ClassDB", "Input", "DisplayServer"]:
-		print("  Engine.has_singleton('", s, "'): ", Engine.has_singleton(s))
+	# Engine singletons are the global objects like OS, Engine, etc.
+	# Can we enumerate them?
+	var singletons = Engine.get_singletons()
+	print("  Engine.get_singletons() count: ", singletons.size())
+	for s in singletons:
+		print("    singleton: ", s)
+	# Can we remove a singleton?
+	print("  Engine has 'remove_singleton': ", Engine.has_method("remove_singleton"))
+	print("  Engine has 'add_singleton': ", Engine.has_method("add_singleton"))
 
-func probe_network_restrictions():
-	print("--- Network restrictions ---")
-	# Can we make outbound HTTP requests?
-	var http = HTTPRequest.new()
-	print("  HTTPRequest.new() = ", http)
-	# Can we create a WebSocket client?
-	var ws = WebSocketPeer.new()
-	print("  WebSocketPeer.new() = ", ws)
-	# Can we access the network via PacketPeer?
-	var pp = PacketPeerUDP.new()
-	print("  PacketPeerUDP.new() = ", pp)
+func probe_script_validation():
+	print("--- Script validation ---")
+	# Can we validate a script before running it?
+	var gd = GDScript.new()
+	gd.source_code = "extends RefCounted\nfunc evil():\n\treturn OS.get_environment('HOME')\n"
+	var err = gd.reload()
+	print("  GDScript.reload() err=", err)
+	# Can we get the list of identifiers used in a script?
+	print("  GDScript has 'get_script_method_list': ", gd.has_method("get_script_method_list"))
+	# Can we get the source code back?
+	print("  GDScript has 'get_source_code': ", gd.has_method("get_source_code"))
+	# Can we check what identifiers a script references?
+	print("  GDScript has 'get_script_constant_map': ", gd.has_method("get_script_constant_map"))
+	# Check if there's a way to get the AST
+	print("  GDScript has 'get_ast': ", gd.has_method("get_ast"))
+	print("  GDScript has 'get_parser': ", gd.has_method("get_parser"))
 
-func probe_threading():
-	print("--- Threading ---")
-	# Can we spawn threads?
-	var thread = Thread.new()
-	print("  Thread.new() = ", thread)
-	# Can we use mutexes / semaphores?
-	var mutex = Mutex.new()
-	print("  Mutex.new() = ", mutex)
-	var sem = Semaphore.new()
-	print("  Semaphore.new() = ", sem)
-
-func probe_expression_eval():
-	print("--- Expression evaluation ---")
-	# Godot's Expression class - can it evaluate arbitrary code?
+func probe_expression_engine():
+	print("--- Expression engine ---")
+	# Godot has an Expression class for evaluating expressions safely
 	var expr = Expression.new()
 	var err = expr.parse("1 + 2")
 	print("  Expression.parse('1 + 2') err=", err)
@@ -97,15 +89,38 @@ func probe_expression_eval():
 	if err == OK:
 		var result2 = expr2.execute()
 		print("  Expression.execute() = ", result2)
+	# Expression with base_instance
+	var expr3 = Expression.new()
+	err = expr3.parse("get_environment('HOME')", ["OS"])
+	print("  Expression.parse with base_instance err=", err)
+	if err == OK:
+		var result3 = expr3.execute([], OS)
+		print("  Expression.execute with OS base = ", result3)
 
-func probe_resource_loading():
-	print("--- Resource loading ---")
-	# Can we load arbitrary resources?
-	var res = load("res://test_script.gd")
-	print("  load('res://test_script.gd') = ", res)
-	# Can we load from absolute paths?
-	var res2 = load("/etc/hostname")
-	print("  load('/etc/hostname') = ", res2)
-	# Can we use ResourceLoader directly?
-	var rl = ResourceLoader
-	print("  ResourceLoader.load('res://test_script.gd') = ", rl.load("res://test_script.gd"))
+func probe_worker_threads():
+	print("--- Worker threads ---")
+	# Can we run scripts in worker threads?
+	print("  Thread has 'new': ", Thread.has_method("new"))
+	# WorkerThreadPool
+	print("  WorkerThreadPool has 'add_task': ", WorkerThreadPool.has_method("add_task"))
+	# Can we isolate a script in a thread?
+	print("  Thread available: ", Thread != null)
+
+func probe_os_restriction_flags():
+	print("--- OS restriction flags ---")
+	# Check if there are any OS-level sandbox flags
+	print("  OS has 'get_environment': ", OS.has_method("get_environment"))
+	print("  OS has 'execute': ", OS.has_method("execute"))
+	print("  OS has 'create_process': ", OS.has_method("create_process"))
+	# Check project settings for sandbox-related options
+	var settings = ProjectSettings.get_property_list()
+	var relevant = []
+	for s in settings:
+		var name = String(s.name)
+		if "sandbox" in name.to_lower() or "restrict" in name.to_lower() or "security" in name.to_lower():
+			relevant.append(name)
+	print("  Sandbox/security project settings: ", relevant)
+	# Check if there's a way to disable specific features
+	print("  ProjectSettings has 'application/run/disable_os': ", ProjectSettings.has_setting("application/run/disable_os"))
+	print("  ProjectSettings has 'application/run/disable_file_access': ", ProjectSettings.has_setting("application/run/disable_file_access"))
+	print("  ProjectSettings has 'application/run/disable_network': ", ProjectSettings.has_setting("application/run/disable_network"))

sandbox_probe/probe3.tscn

@@ -0,0 +1,6 @@
+[gd_scene load_steps=2 format=3]
+
+[ext_resource type="Script" path="res://probe3.gd" id="1"]
+
+[node name="Probe3" type="Node"]
+script = ExtResource("1")