Sometime we may face “Could not create the file” or “Access denied on 'Some file Name' ” or "Unable to copy file. Access to the path is denied" error while try to access or modify a file on a remote machine. After reviewing the code you find out, that because the current user does not have access on a remote machine.
Now we want to force your application to do some restricted activity by a user that who not having privileges to do. we call this procedure Impersonation.
In General Impersonation is, A person act like another.
Unprivileged user can access remote machine like privileged one by using privileged users credentials.
We can achieve Impersonation in may ways, I`m taking "WNetCancelConnection2" function from GAC dll ("mpr.dll").
Note:
mpr.dll is a module containing functions used to handle communication between the Windows operating system and the installed network providers.
Below i`m describing some piece of code to show, how to use RemoteAccessHelper.cs ?
Now we want to force your application to do some restricted activity by a user that who not having privileges to do. we call this procedure Impersonation.
In General Impersonation is, A person act like another.
Unprivileged user can access remote machine like privileged one by using privileged users credentials.
We can achieve Impersonation in may ways, I`m taking "WNetCancelConnection2" function from GAC dll ("mpr.dll").
Note:
mpr.dll is a module containing functions used to handle communication between the Windows operating system and the installed network providers.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using System.ComponentModel;
using System.Net;
namespace SomeNamespace.Utility
{
public class RemoteAccessHelper
{
public class NetworkConnection : IDisposable
{
string _networkName;
public NetworkConnection(string networkName, NetworkCredential credentials)
{
_networkName = networkName;
var netResource = new NetResource()
{
Scope = ResourceScope.GlobalNetwork,
ResourceType = ResourceType.Disk,
DisplayType = ResourceDisplaytype.Share,
RemoteName = networkName
};
var result = WNetAddConnection2(
netResource,
credentials.Password,
credentials.UserName,
0);
if (result != 0)
{
throw new Win32Exception(result, "Error connecting to remote share");
}
}
~NetworkConnection()
{
Dispose(false);
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
WNetCancelConnection2(_networkName, 0, true);
}
[DllImport("mpr.dll")]
private static extern int WNetAddConnection2(NetResource netResource,
string password, string username, int flags);
[DllImport("mpr.dll")]
private static extern int WNetCancelConnection2(string name, int flags,
bool force);
}
[StructLayout(LayoutKind.Sequential)]
public class NetResource
{
public ResourceScope Scope;
public ResourceType ResourceType;
public ResourceDisplaytype DisplayType;
public int Usage;
public string LocalName;
public string RemoteName;
public string Comment;
public string Provider;
}
public enum ResourceScope : int
{
Connected = 1,
GlobalNetwork,
Remembered,
Recent,
Context
};
public enum ResourceType : int
{
Any = 0,
Disk = 1,
Print = 2,
Reserved = 8,
}
public enum ResourceDisplaytype : int
{
Generic = 0x0,
Domain = 0x01,
Server = 0x02,
Share = 0x03,
File = 0x04,
Group = 0x05,
Network = 0x06,
Root = 0x07,
Shareadmin = 0x08,
Directory = 0x09,
Tree = 0x0a,
Ndscontainer = 0x0b
}
}
}
Below i`m describing some piece of code to show, how to use RemoteAccessHelper.cs ?
var oNetworkCredential =
new System.Net.NetworkCredential()
{
Domain = "domainName",
UserName = "domainName" + "\\" + "admin login name",
Password = "admin password"
};
using (new RemoteAccessHelper.NetworkConnection(@"\\" + "domainName", oNetworkCredential))
{
String[] sFolderNames = Directory.GetDirectories( "domainName" + "\\FolderName");
foreach (String sFolderName in sFolderNames)
{
string[] sarrZipFiles = Directory.GetFiles(sFolderName, "*.txt");
foreach (String sFile in sarrZipFiles)
{
// Some unprivileged operations
}
}
}
Source:
Stackoverflow
