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在C#中使用身份验证复制文件

c#.net
10

我正在尝试将文件从本地驱动器复制到服务器上的一个文件夹。服务器上文件夹的名称是“DBFiles”。除了用户名“user”和密码“password1！”之外，没有人可以访问它。

在复制文件之前，它也会创建目录（如果不存在）。

有人能帮忙在创建目录“Test”时获得访问权限，然后复制文件吗？

if (!Directory.Exists(@"\\server-a\copiedfiles\"))
    Directory.CreateDirectory(@"\\server-a\DBFiles\"+Test);   
File.Copy("C:\Temp\abc.txt", @"\\server-a\DBFiles\");

这是C#中的原始代码。

NetworkShare.DisconnectFromShare(@"\\server-a\DBFiles", true); //Disconnect in case we are currently connected with our credentials;
NetworkShare.ConnectToShare(@"\\server-a\DBFiles", "user1", "password1!"); //Connect with the new credentials

File.Copy(@"c:\temp\T1.txt", @"\\server-a\DBFiles\T1.txt");

NetworkShare.DisconnectFromShare(@"\\server-a\DBFiles", false); //Disconnect from the server.

它报错为“访问被拒绝”。

2
你遇到了什么问题？不知道如何对共享进行身份验证？在运行时出现异常？文件复制未复制所有字节？ - Scott Chamberlain
你是否遇到了权限问题？也许你应该以DBFiles文件夹的权限运行你的应用程序。 - lloydom
刚刚注意到，你的 Exists 检查和 CreateDirectory 命令在 \\server-a 上与两个不同的共享进行通信，这是有意为之吗？ - Scott Chamberlain
当我尝试复制文件时，出现了访问被拒绝的错误消息。在需要身份验证访问之前，它一直正常工作。在这里，我需要输入用户名和密码才能访问文件夹。 - user1065542
可能是在C＃中访问密码保护的网络驱动器？的重复问题。 - Scott Chamberlain
显示剩余2条评论
5个回答
28

另一个选项是您可以通过编程方式访问Windows的NET USE API，并像在资源管理器中访问共享并输入凭据一样进行身份验证。

public static class NetworkShare
{
    /// <summary>
    /// Connects to the remote share
    /// </summary>
    /// <returns>Null if successful, otherwise error message.</returns>
    public static string ConnectToShare(string uri, string username, string password)
    {
        //Create netresource and point it at the share
        NETRESOURCE nr = new NETRESOURCE();
        nr.dwType = RESOURCETYPE_DISK;
        nr.lpRemoteName = uri;

        //Create the share
        int ret = WNetUseConnection(IntPtr.Zero, nr, password, username, 0, null, null, null);

        //Check for errors
        if (ret == NO_ERROR)
            return null;
        else
            return GetError(ret);
    }

    /// <summary>
    /// Remove the share from cache.
    /// </summary>
    /// <returns>Null if successful, otherwise error message.</returns>
    public static string DisconnectFromShare(string uri, bool force)
    {
        //remove the share
        int ret = WNetCancelConnection(uri, force);

        //Check for errors
        if (ret == NO_ERROR)
            return null;
        else
            return GetError(ret);
    }

    #region P/Invoke Stuff
    [DllImport("Mpr.dll")]
    private static extern int WNetUseConnection(
        IntPtr hwndOwner,
        NETRESOURCE lpNetResource,
        string lpPassword,
        string lpUserID,
        int dwFlags,
        string lpAccessName,
        string lpBufferSize,
        string lpResult
        );

    [DllImport("Mpr.dll")]
    private static extern int WNetCancelConnection(
        string lpName,
        bool fForce
        );

    [StructLayout(LayoutKind.Sequential)]
    private class NETRESOURCE
    {
        public int dwScope = 0;
        public int dwType = 0;
        public int dwDisplayType = 0;
        public int dwUsage = 0;
        public string lpLocalName = "";
        public string lpRemoteName = "";
        public string lpComment = "";
        public string lpProvider = "";
    }

    #region Consts
    const int RESOURCETYPE_DISK = 0x00000001;
    const int CONNECT_UPDATE_PROFILE = 0x00000001;
    #endregion

    #region Errors
    const int NO_ERROR = 0;

    const int ERROR_ACCESS_DENIED = 5;
    const int ERROR_ALREADY_ASSIGNED = 85;
    const int ERROR_BAD_DEVICE = 1200;
    const int ERROR_BAD_NET_NAME = 67;
    const int ERROR_BAD_PROVIDER = 1204;
    const int ERROR_CANCELLED = 1223;
    const int ERROR_EXTENDED_ERROR = 1208;
    const int ERROR_INVALID_ADDRESS = 487;
    const int ERROR_INVALID_PARAMETER = 87;
    const int ERROR_INVALID_PASSWORD = 1216;
    const int ERROR_MORE_DATA = 234;
    const int ERROR_NO_MORE_ITEMS = 259;
    const int ERROR_NO_NET_OR_BAD_PATH = 1203;
    const int ERROR_NO_NETWORK = 1222;
    const int ERROR_SESSION_CREDENTIAL_CONFLICT = 1219;

    const int ERROR_BAD_PROFILE = 1206;
    const int ERROR_CANNOT_OPEN_PROFILE = 1205;
    const int ERROR_DEVICE_IN_USE = 2404;
    const int ERROR_NOT_CONNECTED = 2250;
    const int ERROR_OPEN_FILES = 2401;

    private struct ErrorClass
    {
        public int num;
        public string message;
        public ErrorClass(int num, string message)
        {
            this.num = num;
            this.message = message;
        }
    }

    private static ErrorClass[] ERROR_LIST = new ErrorClass[] {
        new ErrorClass(ERROR_ACCESS_DENIED, "Error: Access Denied"), 
        new ErrorClass(ERROR_ALREADY_ASSIGNED, "Error: Already Assigned"), 
        new ErrorClass(ERROR_BAD_DEVICE, "Error: Bad Device"), 
        new ErrorClass(ERROR_BAD_NET_NAME, "Error: Bad Net Name"), 
        new ErrorClass(ERROR_BAD_PROVIDER, "Error: Bad Provider"), 
        new ErrorClass(ERROR_CANCELLED, "Error: Cancelled"), 
        new ErrorClass(ERROR_EXTENDED_ERROR, "Error: Extended Error"), 
        new ErrorClass(ERROR_INVALID_ADDRESS, "Error: Invalid Address"), 
        new ErrorClass(ERROR_INVALID_PARAMETER, "Error: Invalid Parameter"), 
        new ErrorClass(ERROR_INVALID_PASSWORD, "Error: Invalid Password"), 
        new ErrorClass(ERROR_MORE_DATA, "Error: More Data"), 
        new ErrorClass(ERROR_NO_MORE_ITEMS, "Error: No More Items"), 
        new ErrorClass(ERROR_NO_NET_OR_BAD_PATH, "Error: No Net Or Bad Path"), 
        new ErrorClass(ERROR_NO_NETWORK, "Error: No Network"), 
        new ErrorClass(ERROR_BAD_PROFILE, "Error: Bad Profile"), 
        new ErrorClass(ERROR_CANNOT_OPEN_PROFILE, "Error: Cannot Open Profile"), 
        new ErrorClass(ERROR_DEVICE_IN_USE, "Error: Device In Use"), 
        new ErrorClass(ERROR_EXTENDED_ERROR, "Error: Extended Error"), 
        new ErrorClass(ERROR_NOT_CONNECTED, "Error: Not Connected"), 
        new ErrorClass(ERROR_OPEN_FILES, "Error: Open Files"), 
        new ErrorClass(ERROR_SESSION_CREDENTIAL_CONFLICT, "Error: Credential Conflict"),
    };

    private static string GetError(int errNum)
    {
        foreach (ErrorClass er in ERROR_LIST)
        {
            if (er.num == errNum) return er.message;
        }
        return "Error: Unknown, " + errNum;
    }
    #endregion

    #endregion
}
您可以简单地像这样使用它
DisconnectFromShare(@"\\server-a\DBFiles", true); //Disconnect in case we are currently connected with our credentials;

ConnectToShare(@"\\server-a\DBFiles", username, password); //Connect with the new credentials

if (!Directory.Exists(@"\\server-a\DBFiles\"))
    Directory.CreateDirectory(@"\\server-a\DBFiles\"+Test);   
File.Copy("C:\Temp\abc.txt", @"\\server-a\DBFiles\");

DisconnectFromShare(@"\\server-a\DBFiles", false); //Disconnect from the server.
不，Mpr.dll 是 Windows 的一部分，您可以像调用 User32.dll 或 Kernel32.dll 一样使用它。 - Scott Chamberlain
3
在文件顶部添加命名空间 using System.Runtime.InteropServices;。 - Scott Chamberlain
你是在 \\server-a\copiedfiles\ 还是在 \\server-a\DBFiles\ 创建目录？你的示例中两者都有使用。另外，连接URL参数是哪一个？请确认ConnectToShare是否返回错误字符串。 - Scott Chamberlain
主文件夹是 '\server-a\DBFiles\Test'，但如果没有 'Test' 文件夹，则创建 'Test' 文件夹。由于这是我第一次运行，所以它应该创建文件夹。它首先可以检测到文件夹不存在，但随后出现访问被拒绝的错误。 - user1065542
这是循环运行两次的代码：foreach (ErrorClass er in ERROR_LIST) { if (er.num == errNum) return er.message; Console.WriteLine(er.num); Console.WriteLine(errNum); } - user1065542
显示剩余9条评论
9

您可以使用模拟来更改线程的用户上下文：

[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);
...
LogonUser(userName, domainName, password,
            LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT,
            out safeTokenHandle);
...
using (WindowsIdentity newId = new WindowsIdentity(safeTokenHandle.DangerousGetHandle()))
            {
                using (WindowsImpersonationContext impersonatedUser = newId.Impersonate())
                {

                    // Check the identity.
                    Console.WriteLine("After impersonation: "
                        + WindowsIdentity.GetCurrent().Name);
                    //Do your coping here
                }
            }

MSDN Sample windowsimpersonationcontext

我在这里需要做什么？不太明白。 - user1065542
你看过 MSDN 的示例吗？ - Peter
@user1065542，您需要将第一部分添加到您的类中。第二部分是您在函数中使用的内容，以建立模拟并输出“safeTokenHandle”。第三部分紧随其后，使用该令牌为您提供一个“WindowsIdentity”，该标识符代表新登录的用户。然后，Windows需要一个上下文来运行该“WindowsIdentity”，以“WindowsImpersonationContext”的形式运行“.Impersonate()”。当您在“Console.WriteLine”语句处时，就可以进行文件复制了。 - vapcguy
1
为了运行这段代码，您还需要在类的顶部添加以下内容：private static IntPtr safeTokenHandle = new IntPtr(0); const int LOGON32_LOGON_INTERACTIVE = 2; const int LOGON32_PROVIDER_DEFAULT = 0;，以及用于传递给 LogonUser() 的 userName、domainName 和 password 变量，就像第二个片段中所示。 - vapcguy
3
NetworkShare.DisconnectFromShare(@"\\server-a\DBFiles", true); //Remove this line
NetworkShare.ConnectToShare(@"\\server-a\DBFiles", "user1", "password1!"); //Connect with the new credentials

File.Copy(@"c:\temp\T1.txt", @"\\server-a\DBFiles\T1.txt");

NetworkShare.DisconnectFromShare(@"\\server-a\DBFiles", false); //Remove this line also

在谷歌上搜索了02天后，最终上述方法对我起作用了。 如果您在第一次登录后使用'NetworkShare.DisconnectFromShare'，您将会收到一个'Access denied'的错误。然后每次您需要重启服务器或需要执行'net use * /del'命令来删除Windows中保存的凭据。

似乎存在断开例程的问题-强调不仅要在代码注释中说明，而且不应该使用。我不得不读几遍这篇文章才能理解你的意思。 - vapcguy
1

我已经从远程服务器复制了这个文件，请查看代码。

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Net;
using System.Security.Principal;
using System.Runtime.InteropServices;
namespace IMPolicy
{
public partial class ExtractData : System.Web.UI.Page
{
    [DllImport("advapi32.DLL", SetLastError = true)]
    public static extern int LogonUser(string lpszUsername, string lpszDomain, string lpszPassword, int dwLogonType, int dwLogonProvider, ref IntPtr phToken);
    protected void Page_Load(object sender, EventArgs e)
    {            

        AppDomain.CurrentDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal);

        IntPtr token = default(IntPtr);
        if (LogonUser("UserName", "Domain", "Password", 2, 0, ref token) != 0)
        {

            WindowsIdentity identity = new WindowsIdentity(token);
            WindowsImpersonationContext context = identity.Impersonate();

            try
            {                
                File.Copy(@"\\\\10.10.38.25\d$\\Sourav\\Draft Report ITC-LRBD_Online Booking Portal_12082016.pdf", @"d:\\Draft Report ITC-LRBD_Online Booking Portal_12082016.pdf", true);
             }
             finally
             {
                 context.Undo();
             }
        }




    }


  }
}
0
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Security.Principal;
using System.Text;
using System.Threading.Tasks;

namespace Files_copy_from_Server
{
    class Program
    {
        static void Main(string[] args)
        {
            NetworkShare.copyfiles();
            Console.ReadLine();
        }
    }
    public static class NetworkShare
    {
        public static  void copyfiles()
        {
            try
            {
                string username = "username";
                string password = "Password";
                DisconnectFromShare(@"\\192.168.11.95\Destination", true); 

//Disconnect in case we are currently connected with our credentials;
                    ConnectToShare(@"\\192.168.11.95\Destination", username, password); //Connect with the new credentials
                    if (!Directory.Exists(@"\\192.168.11.95\Destination\"))
                    Directory.CreateDirectory(@"\\192.168.11.95\Destination\");
                    File.Copy(@"D:\OldBackup\CADCallEnvelopBL.cs", @"\\192.168.11.95\Destination\CADCallEnvelopBL.cs");
                    DisconnectFromShare(@"\\192.168.11.95\Destination\", false); 
 //Disconnect from the server.
                }
                catch (Exception objError)
                {
                Console.Write(objError.Message);
            }
        }
        /// <summary>
        /// Connects to the remote share
        /// </summary>
        /// <returns>Null if successful, otherwise error message.</returns>
        public static string ConnectToShare(string uri, string username, string 
        password)
        {
            //Create netresource and point it at the share
            NETRESOURCE nr = new NETRESOURCE();
            nr.dwType = RESOURCETYPE_DISK;
            nr.lpRemoteName = uri;
        //Create the share
        int ret = WNetUseConnection(IntPtr.Zero, nr, password, username, 0, null, null, null);

        //Check for errors
        if (ret == NO_ERROR)
            return null;
        else
            return GetError(ret);
    }

    /// <summary>
    /// Remove the share from cache.
    /// </summary>
    /// <returns>Null if successful, otherwise error message.</returns>
    public static string DisconnectFromShare(string uri, bool force)
    {
        //remove the share
        int ret = WNetCancelConnection(uri, force);

        //Check for errors
        if (ret == NO_ERROR)
            return null;
        else
            return GetError(ret);
    }

    #region P/Invoke Stuff
    [DllImport("Mpr.dll")]
    private static extern int WNetUseConnection(
        IntPtr hwndOwner,
        NETRESOURCE lpNetResource,
        string lpPassword,
        string lpUserID,
        int dwFlags,
        string lpAccessName,
        string lpBufferSize,
        string lpResult
        );

    [DllImport("Mpr.dll")]
    private static extern int WNetCancelConnection(
        string lpName,
        bool fForce
        );

    [StructLayout(LayoutKind.Sequential)]
    private class NETRESOURCE
    {
        public int dwScope = 0;
        public int dwType = 0;
        public int dwDisplayType = 0;
        public int dwUsage = 0;
        public string lpLocalName = "";
        public string lpRemoteName = "";
        public string lpComment = "";
        public string lpProvider = "";
    }

    #region Consts
    const int RESOURCETYPE_DISK = 0x00000001;
    const int CONNECT_UPDATE_PROFILE = 0x00000001;
    #endregion

    #region Errors
    const int NO_ERROR = 0;

    const int ERROR_ACCESS_DENIED = 5;
    const int ERROR_ALREADY_ASSIGNED = 85;
    const int ERROR_BAD_DEVICE = 1200;
    const int ERROR_BAD_NET_NAME = 67;
    const int ERROR_BAD_PROVIDER = 1204;
    const int ERROR_CANCELLED = 1223;
    const int ERROR_EXTENDED_ERROR = 1208;
    const int ERROR_INVALID_ADDRESS = 487;
    const int ERROR_INVALID_PARAMETER = 87;
    const int ERROR_INVALID_PASSWORD = 1216;
    const int ERROR_MORE_DATA = 234;
    const int ERROR_NO_MORE_ITEMS = 259;
    const int ERROR_NO_NET_OR_BAD_PATH = 1203;
    const int ERROR_NO_NETWORK = 1222;
    const int ERROR_SESSION_CREDENTIAL_CONFLICT = 1219;

    const int ERROR_BAD_PROFILE = 1206;
    const int ERROR_CANNOT_OPEN_PROFILE = 1205;
    const int ERROR_DEVICE_IN_USE = 2404;
    const int ERROR_NOT_CONNECTED = 2250;
    const int ERROR_OPEN_FILES = 2401;

    private struct ErrorClass
    {
        public int num;
        public string message;
        public ErrorClass(int num, string message)
        {
            this.num = num;
            this.message = message;
        }
    }

    private static ErrorClass[] ERROR_LIST = new ErrorClass[] {
    new ErrorClass(ERROR_ACCESS_DENIED, "Error: Access Denied"),
    new ErrorClass(ERROR_ALREADY_ASSIGNED, "Error: Already Assigned"),
    new ErrorClass(ERROR_BAD_DEVICE, "Error: Bad Device"),
    new ErrorClass(ERROR_BAD_NET_NAME, "Error: Bad Net Name"),
    new ErrorClass(ERROR_BAD_PROVIDER, "Error: Bad Provider"),
    new ErrorClass(ERROR_CANCELLED, "Error: Cancelled"),
    new ErrorClass(ERROR_EXTENDED_ERROR, "Error: Extended Error"),
    new ErrorClass(ERROR_INVALID_ADDRESS, "Error: Invalid Address"),
    new ErrorClass(ERROR_INVALID_PARAMETER, "Error: Invalid Parameter"),
    new ErrorClass(ERROR_INVALID_PASSWORD, "Error: Invalid Password"),
    new ErrorClass(ERROR_MORE_DATA, "Error: More Data"),
    new ErrorClass(ERROR_NO_MORE_ITEMS, "Error: No More Items"),
    new ErrorClass(ERROR_NO_NET_OR_BAD_PATH, "Error: No Net Or Bad Path"),
    new ErrorClass(ERROR_NO_NETWORK, "Error: No Network"),
    new ErrorClass(ERROR_BAD_PROFILE, "Error: Bad Profile"),
    new ErrorClass(ERROR_CANNOT_OPEN_PROFILE, "Error: Cannot Open Profile"),
    new ErrorClass(ERROR_DEVICE_IN_USE, "Error: Device In Use"),
    new ErrorClass(ERROR_EXTENDED_ERROR, "Error: Extended Error"),
    new ErrorClass(ERROR_NOT_CONNECTED, "Error: Not Connected"),
    new ErrorClass(ERROR_OPEN_FILES, "Error: Open Files"),
    new ErrorClass(ERROR_SESSION_CREDENTIAL_CONFLICT, "Error: Credential Conflict"),
};
    private static string GetError(int errNum)
    {
        foreach (ErrorClass er in ERROR_LIST)
        {
            if (er.num == errNum)
            {
                return er.message;                
            }             
        }
        return "Error: Unknown, " + errNum;
    }
    #endregion

    #endregion
}

}

欢迎并感谢您贡献代码。您能否更新您的答案，包括更多关于您正在做什么的解释，并突出显示您的代码中解决特定问题的关键部分是什么？通常，我们尝试避免将大量代码作为答案，因为它们无法帮助未来的读者学习概念或将其应用于不同的场景。 - Jeremy Caney
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