从Azure Worker角色访问文件共享

Question

我们想在Windows Azure中迁移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)。如果我们试图从Worker角色访问FTP服务器的文件共享，我们通常会得到"访问路径"…。我们能够从Worker角色通过远程桌面访问FTP服务器的文件共享，这意味着防火墙和FTP配置是正确的。辅助角色可以访问Windows Azure数据中心中的文件共享吗?

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:DevelopmentSamplesCloudServicesPlugInSampleCloudServices.WorkerRoleBusinessLayersWorkOrderProcessing.cs:line 56
   at KALCIK.NET.CloudServices.WorkerRole.WorkOrderProcessorService.Run() in c:DevelopmentSamplesCloudServicesPlugInSampleCloudServices.WorkerRoleWorkOrderProcessorService.cs:line 67; TraceSource 'WaWorkerHost.exe' event

Answer 1

是用户的问题，主机下的进程正在运行。要解决这个问题，您可以创建具有管理员权限的新用户(例如，在角色启动时借助启动任务)，并模拟执行的代码。您可以在这里看到示例实现。

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。在你的目录前尝试"网络使用"。getfile

"net use" from c#:访问远程目录