通过网络将文件复制到域外的目标 [英] Copy a file over network to a destination outside domain

问题描述

我想使用c＃通过网络将文件从计算机A（帐户为myAccount @ mydomain）复制到计算机B（用户B @ computerB）。
我尝试了标准

I want to copy a file from computer A(with account myAccount@mydomain) to computer B(userB@computerB) over the network using c#. I tried the standard

File.Copy(source,destination)

并尝试启动cmd进程（从计算机A）并调用复制方法

and tried starting a cmd process (from computer A) and call the copy method

System.Diagnostics.Process process = new System.Diagnostics.Process();
System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo();
startInfo.UseShellExecute = false;
startInfo.Domain = "computerB"; //ofcourse it wont work since its outside the local domain of A
startInfo.FileName = "cmd.exe";
startInfo.Arguments = @"/C COPY \\computerA\Path\File1.txt \\computerB\Path$ ";
process.StartInfo = startInfo;
process.Start();
process.WaitForExit();
//It will exit the user name or password is incorrect

我也尝试使用PSexec来模拟计算机B ：

I tried also to use PSexec to impersonate computerB :

 System.Diagnostics.Process process = new System.Diagnostics.Process();
 System.Diagnostics.ProcessStartInfo startInfo = new 
 System.Diagnostics.ProcessStartInfo();
 startInfo.UseShellExecute = false;
 startInfo.FileName = "cmd.exe";
 startInfo.Arguments = @"psexec \\computerB -u computerB\userB -p userBPassword cmd /c COPY \\computerA\Path\File1.txt \\computerB\Path$";
 process.StartInfo = startInfo;
 process.Start();
 process.WaitForExit();
//it will exit that the source file is unknown

总而言之，计算机A能够请参阅源（自身），而不要查看目的地（因为计算机B仅具有授权的本地用户）。
计算机B能够看到目的地（本身）但看不到源（因为计算机A在其域之外并且未通过网络共享）。

To sum it up,computer A is able to see the source(itself) but not the destination(since computer B has only authorized local user). computer B is able to see the destination(itself) but not the source(since computer A is outside its domain and its not shared over the network).

是否有一个此问题的解决方法？

Is there a workaround for this issue?

推荐答案

听起来像这是一个相当简单的身份验证问题，每当当前用户时，该问题就会弹出在域中和域外都没有共享权。在系统用户下运行并尝试访问其他设备上的共享时，也会出现此问题。

It sounds like this is a fairly simple authentication problem of the type that pops up whenever the current user doesn't have rights on a share, both in a domain and out. The problem also arises when running under the system user and trying to access shares on other devices.

解决方案是使用 WNetUseConnection API，执行文件操作，然后关闭调用 WNetCancelConnection2 。

The solution is to open an authenticated connection to the target device using the WNetUseConnection API, perform your file operations then close the connection with a call to WNetCancelConnection2.

这是我过去使用的一些代码：

Here's some code I have used in the past for this:

class ConnectSMB : IDisposable
{
    public string URI { get; private set; }
    public bool Connected { get; private set; } = false;

    public ConnectSMB(string uri, string username, string encPassword)
    {
        string pass = StringEncryption.Decode(encPassword);
        string connResult = Native.ConnectToRemote(uri, username, pass);
        if (connResult != null)
            throw new Exception(connResult);
            
        URI = uri;
        Connected = true;
    }

    public void Dispose()
    {
        Close();
    }

    public void Close()
    {
        if (Connected)
        {
            Native.DisconnectRemote(URI);
            URI = null;
            Connected = false;
        }
    }
}

public class Native
{
    #region Consts
    const int RESOURCETYPE_DISK = 1;
    const int CONNECT_UPDATE_PROFILE = 0x00000001;
    #endregion

    #region Errors
    public enum ENetUseError
    {
        NoError = 0,
        AccessDenied = 5,
        AlreadyAssigned = 85,
        BadDevice = 1200,
        BadNetName = 67,
        BadProvider = 1204,
        Cancelled = 1223,
        ExtendedError = 1208,
        InvalidAddress = 487,
        InvalidParameter = 87,
        InvalidPassword = 1216,
        MoreData = 234,
        NoMoreItems = 259,
        NoNetOrBadPath = 1203,
        NoNetwork = 1222,
        BadProfile = 1206,
        CannotOpenProfile = 1205,
        DeviceInUse = 2404,
        NotConnected = 2250,
        OpenFiles = 2401
    }
    #endregion

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

    [DllImport("Mpr.dll")]
    private static extern ENetUseError WNetCancelConnection2(
        string lpName,
        int dwFlags,
        bool fForce
    );

    [StructLayout(LayoutKind.Sequential)]
    private class NETRESOURCE
    {
        // Not used
        public int dwScope = 0;
        // Resource Type - disk or printer
        public int dwType = RESOURCETYPE_DISK;
        // Not used
        public int dwDisplayType = 0;
        // Not used
        public int dwUsage = 0;
        // Local Name - name of local device (optional, not used here)
        public string lpLocalName = "";
        // Remote Name - full path to remote share
        public string lpRemoteName = "";
        // Not used
        public string lpComment = "";
        // Not used
        public string lpProvider = "";
    }
    #endregion

    public static string ConnectToRemote(string remoteUNC, string username, string password)
    {
        NETRESOURCE nr = new NETRESOURCE
        {
            lpRemoteName = remoteUNC
        };

        ENetUseError ret = WNetUseConnection(IntPtr.Zero, nr, password, username, 0, null, null, null);
        if (ret == ENetUseError.NoError) return null;
        return ret.ToString();
    }

    public static string DisconnectRemote(string remoteUNC)
    {
        ENetUseError ret = WNetCancelConnection2(remoteUNC, CONNECT_UPDATE_PROFILE, false);
        if (ret == ENetUseError.NoError) return null;
        return ret.ToString();
    }
}

创建 ConnectSMB 类，然后再执行远程文件操作，然后在完成连接后处置（或关闭）该类。

Create an instance of the ConnectSMB class before you do your remote file operations, then dispose (or close) it when you're done with the connection.

using (var smb = new ConnectSMB(@"\\computerB\Path", "userB", "userBPassword"))
{
    File.Copy(source, destination);
}

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