受限 AppDomain 中的 C# Class 继承自位于主 AppDomain 中的另一个 class

Question

我尝试在 C# 中创建一个简单的控制台改装项目，其中我的程序包含一个 抽象列表 class，名为 ElementInGame 。我希望能够创建其他 class 从 .txt 文件 继承 ElementInGame。 class ElementInGame 将包含一些基本方法（虚拟的和非虚拟的）。但我不希望这些其他修改的 class 执行恶意代码，我希望他们只能从继承的 class 访问 methods/properties。这是我的 ElementInGame 代码：

（我的 C# 程序 #1）

using System;

namespace Modding
{
    //The class itself inherit from MarshalByRefObject to be available in 2 differents Domains
    public abstract class ElementInGame : MarshalByRefObject
    {
        public ElementInGame()
        {
            Console.WriteLine("ElementInGame class created");
        }

        public virtual int GetNumber()
        {
            return 10;
        }

        public void CountToTen()
        {
            for (int i = 0; i <= 10; i++)
            {
                Console.WriteLine(i);
            }
        }
    }
}

然后我将我的 .txt 文件存储在 "C:\program.txt"

（我原来的 .txt 文件）

using System;

namespace Test
{   
    public class HelloWorld
    {
        public HelloWorld()
        {
            Console.WriteLine("Called Constructor() !");
        }

        public static int TestMethod()
        {
            Console.WriteLine("Called TestMethod() !");
            return 11;
        }
    }
}

所以我编写主程序来读取.txt文件，限制编译，然后执行:

（我的 C# 程序 #2 在第二个 .cs 文件中，长代码警告）

using System;
using System.CodeDom.Compiler;
using System.IO;
using Microsoft.CSharp;
using System.Reflection;
using System.Security.Permissions;
using System.Security;
using System.Security.Policy;
using System.Runtime.Remoting;
using System.Collections.Generic;

namespace Modding
{
    public class Program : MarshalByRefObject
    {
        public static void Main(string[] args)
        {

            string assemblyPath = @"C:\program.txt"; // Where the .txt file is stored
            string code = File.ReadAllText(assemblyPath); //The code to compile

            CompilerResults compile = CompileFromCode(code); //Compile the code in the temporary files

            string fullPath = compile.PathToAssembly;                           //sample : C:\Users\MY_USER_NAME\AppData\Local\Tempv2p3qki.dll
            string pathWithoutFile = Path.GetDirectoryName(fullPath);           //sample : C:\Users\MY_USER_NAME\AppData\Local\Temp
            string pathNameOnly = Path.GetFileNameWithoutExtension(fullPath);   //sample : 5v2p3qki

            Program newDomainInstance = GetOtherProtectedDomainInstance(pathWithoutFile);

            newDomainInstance.CallMethod(pathNameOnly, "Test.HelloWorld", "TestMethod", null, null);
            newDomainInstance.CreateObject(pathNameOnly,"Test.HelloWorld");

            List<ElementInGame> allElement = new List<ElementInGame>();
            //allElement.Add ***?***

            Console.ReadKey();
        }

        public static Program GetOtherProtectedDomainInstance(string pathWithoutFile)
        {
            AppDomainSetup adSetup = new AppDomainSetup();
            adSetup.ApplicationBase = pathWithoutFile;

            //Set some permissions to avoid malicious code
            PermissionSet permSet = new PermissionSet(PermissionState.None);
            permSet.AddPermission(new SecurityPermission(SecurityPermissionFlag.Execution));

            StrongName fullTrustAssembly = new StrongName(
                new StrongNamePublicKeyBlob(typeof(Program).Assembly.GetName().GetPublicKey()),
                typeof(Program).Assembly.GetName().Name,
                typeof(Program).Assembly.GetName().Version);

            AppDomain newDomain = AppDomain.CreateDomain("Sandbox", null, adSetup, permSet, fullTrustAssembly);

            ObjectHandle handle = Activator.CreateInstanceFrom(
                newDomain, typeof(Program).Assembly.ManifestModule.FullyQualifiedName,
                typeof(Program).FullName
                );

            Program newDomainInstance = (Program)handle.Unwrap();
            return newDomainInstance;
        }

        public static CompilerResults CompileFromCode(string code)
        {
            //Compile the code in a .dll locate in the temporary files
            //The following code is based on 
            CompilerParameters CompilerParams = new CompilerParameters();
            string outputDirectory = Directory.GetCurrentDirectory();

            CompilerParams.GenerateInMemory = false;
            CompilerParams.TreatWarningsAsErrors = false;
            CompilerParams.GenerateExecutable = false;
            CompilerParams.CompilerOptions = "/optimize";

            //Adding a reference to the current project to allow the .txt file to inherit the class "ElementInGame" later
            string[] references = { "System.dll", Assembly.GetEntryAssembly().Location };
            CompilerParams.ReferencedAssemblies.AddRange(references);

            CSharpCodeProvider provider = new CSharpCodeProvider();
            CompilerResults compile = provider.CompileAssemblyFromSource(CompilerParams, code);

            if (compile.Errors.HasErrors)
            {
                string text = "Compile error: ";
                foreach (CompilerError ce in compile.Errors)
                {
                    text += "rn" + ce.ToString();
                }
                throw new Exception(text);
            }

            return compile;
        }

        public static void DisplaySomething()//Useful for later
        {
            Console.WriteLine("This isn't supposed to be display");
        }

        //Calling a method from the restricted Domain
        public void CallMethod(string assemblyName, string typeName, string entryPoint, object objectToExecute = null, object[] parameters = null)
        {
            MethodInfo target = Assembly.Load(assemblyName).GetType(typeName).GetMethod(entryPoint);
            try
            {
                target.Invoke(objectToExecute, parameters);
            }
            catch
            {
                Console.WriteLine("Security Error with Method " + assemblyName + " namespace : " + typeName + " method : " + entryPoint);
            }
        }

        //Create an instance from the restricted Domain
        public void CreateObject(string assemblyName, string typeName)
        {
            try
            {
                object o = Assembly.Load(assemblyName).CreateInstance(typeName);
            }
            catch
            {
                Console.WriteLine("Security Error with Constructor " + assemblyName + " namespace : " + typeName);
            }
        }
    }
}

目前 .txt 文件根本没有 link 我的 C# 程序。 代码正常工作，我得到以下输出：

Called TestMethod() !
Called Constructor() !

然后我在我的 .txt 文件中编辑我的代码以继承自 Modding.ElementInGame :

（我的 编辑的 .txt 文件）

using System;

namespace Test
{   
    public class HelloWorld : Modding.ElementInGame
    {
        public HelloWorld() : base()
        {
            Console.WriteLine("Called Constructor() !");
        }

        public static int TestMethod()
        {
            Console.WriteLine("Called TestMethod() !");
            return 11;
        }
    }
}

所以我希望得到这样的输出：

Called TestMethod() !
ElementInGame class created
Called Constructor() !

但在进行此更改后，程序在调用 TestMethod 时崩溃，并带有 System.NullReferenceException：newDomainInstance.CallMethod(pathNameOnly, "Test.HelloWorld", "TestMethod", null, null);

但是创建 HelloWorld 实例（.txt 文件）：newDomainInstance.CreateObject(pathNameOnly,"Test.HelloWorld"); 似乎有效（没有崩溃，代码在执行时留在 try 部分try/catch)，但是我的 我的控制台中没有打印任何内容，所以我猜它不起作用？

更改 AppDomain 的权限没有任何改变。

PermissionSet permSet = new PermissionSet(PermissionState.Unrestricted);
permSet.AddPermission(new SecurityPermission(SecurityPermissionFlag.AllFlags));

所以我的问题是：我怎样才能创建和存储我的程序中的 .txt 文件 从 ElementInGame 继承（并将其添加到 ElementInGame 列表中）？

这样我就可以在我的程序中使用虚拟方法 GetNumber()。我不希望 .txt 文件访问程序本身（比如调用 DisplaySomething() 方法），只需与 ElementInGame 通信。

Answer 1

您正在从不同位置生成和加载引用程序集。您确实为输出设置了当前目录，但忘记将其分配给编译器参数。

string outputDirectory = Directory.GetCurrentDirectory();
CompilerParams.OutputAssembly = Path.Combine(outputDirectory, "Test.dll");

这应该可以解决问题。

受限 AppDomain 中的 C# Class 继承自位于主 AppDomain 中的另一个 class

C# Class in a restricted AppDomain inherit from an other class located in the main AppDomain

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