从 Azure 辅助角色访问文件共享

Question

我们希望在 Windows Azure 中迁移我们的 FTP 服务器。我们创建了干净的虚拟机映像并在那里安装了 FTP 服务器。现在，为了能够直接从 Windows Azure 数据中心处理驻留在 FTP 目录中的文件，我们创建了文件共享和端点（端口 445 TCP 和 UDP）。如果我们尝试从 Worker Role 访问 FTP 服务器的文件共享，我们通常会得到'对路径'...'的访问被拒绝。'。我们可以从 Worker Role 通过远程桌面访问 FTP 服务器的文件共享，这意味着防火墙和 FTP 配置是正确的。辅助角色能否访问 Windows Azure 数据中心中的文件共享？

代码：

        try
        {
            const string networkShare = @"...";
            Directory.GetFiles(networkShare).ToList().ForEach(file => Trace.TraceInformation(file));

            Thread.Sleep(10000);
            Trace.WriteLine("Working", "Information");
        }
        catch (Exception ex)
        {
            Trace.TraceError(ex.ToString());
        }

例外：

Exception thrown on running: System.UnauthorizedAccessException: Access to the path '...' is denied.

Server stack trace: 
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileSystemEnumerableIterator`1.CommonInit()
   at System.IO.FileSystemEnumerableIterator`1..ctor(String path, String originalUserPath, String searchPattern, SearchOption searchOption, SearchResultHandler`1 resultHandler, Boolean checkHost)
   at System.IO.Directory.InternalGetFileDirectoryNames(String path, String userPathOriginal, String searchPattern, Boolean includeFiles, Boolean includeDirs, SearchOption searchOption, Boolean checkHost)
   at System.IO.Directory.InternalGetFiles(String path, String searchPattern, SearchOption searchOption)
   at KALCIK.NET.Plugin.ReadFromShare.ReadFromSharePlugin.Manipulate(String valueToManipulate)
   at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs)
   at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg)

Exception rethrown at [0]: 
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at KALCIK.NET.Plugin.Contracts.TextManipulationPluginBase.Manipulate(String valueToManipulate)
   at KALCIK.NET.CloudServices.WorkerRole.BusinessLayers.WorkOrderProcessing.ProcessWorkOrder(Tuple`2 workOrder) in c:\Development\Samples\CloudServicesPlugInSample\CloudServices.WorkerRole\BusinessLayers\WorkOrderProcessing.cs:line 56
   at KALCIK.NET.CloudServices.WorkerRole.WorkOrderProcessorService.Run() in c:\Development\Samples\CloudServicesPlugInSample\CloudServices.WorkerRole\WorkOrderProcessorService.cs:line 67; TraceSource 'WaWorkerHost.exe' event

Answer 1

是的，好像是用户的问题，主机下的进程正在运行。要解决此问题，您可以创建具有管理员权限的新用户（例如在启动任务的帮助下，在角色启动时）并模拟执行的代码。你可以看到示例实现here。

public class WorkerRole : RoleEntryPoint
{

    public sealed class SafeTokenHandle : SafeHandleZeroOrMinusOneIsInvalid
    {
        private SafeTokenHandle() : base(true) { }

        [DllImport("kernel32.dll")]
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
        [SuppressUnmanagedCodeSecurity]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool CloseHandle(IntPtr handle);

        protected override bool ReleaseHandle()
        {
            return CloseHandle(handle);
        }
    }

    [DllImport("advapi32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
    public static extern bool LogonUser(String lpszUsername, String lpszDomain, String lpszPassword, int dwLogonType, int dwLogonProvider, out SafeTokenHandle phToken);

    [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
    public extern static bool CloseHandle(IntPtr handle);

    public override void Run()
    {

        // This is a sample worker implementation. Replace with your logic.
        Trace.WriteLine("TestWorkerRole entry point called", "Information");

        while (true)
        {
            try
            {

                SafeTokenHandle safeTokenHandle;
                var returnValue = LogonUser("username", Environment.MachineName, "password", 2, 0, out safeTokenHandle);

                if (returnValue)
                {
                    using (safeTokenHandle)
                    {
                        using (var impersonatedUser = WindowsIdentity.Impersonate(safeTokenHandle.DangerousGetHandle()))
                        {
                            const string networkSharePath = @"UNCPath";
                            Directory.GetFiles(networkSharePath).ToList().ForEach(file => Trace.TraceInformation(file));
                        }
                    }

                }

                Thread.Sleep(10000);
                Trace.WriteLine("Working", "Information");
            }
            catch (Exception ex)
            {
                Trace.TraceError(ex.ToString());
            }
        }
    }
}

Answer 2

我认为这是一个安全问题：用户（工作角色在其下运行）无法在网络共享上进行身份验证。在 Directory.GetFiles 之前尝试“网络使用”

来自 C# 的“网络使用”：Access a Remote Directory from C#