Network file share access in .NetCore

Question

I am trying to access a network file share with .NET Core. I have seen this solution for Net Standard:

How to provide user name and password when connecting to a network share

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 userName = string.IsNullOrEmpty(credentials.Domain)
            ? credentials.UserName
            : string.Format(@"{0}\{1}", credentials.Domain, credentials.UserName);

        var result = WNetAddConnection2(
            netResource, 
            credentials.Password,
            userName,
            0);

        if (result != 0)
        {
            throw new Win32Exception(result);
        }   
    }

    ~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
    }

I have read that using [DllImport("mpr.dll")] in core is not advised. Is there a .net core way to do this.

Answer 1

For running in Linux, You could use this library. It works for me. https://github.com/TalAloni/SMBLibrary/blob/master/ClientExamples.md

//Assuming you want to access //yourServerName.xyz.com/A/B/123.txt
var client = new SMB2Client(); 
var cancelToken = new System.Threading.CancellationToken();
var isConnected = client.ConnectAsync("yourServerName.com", SMBTransportType.DirectTCPTransport, cancelToken).Result;
if (isConnected)
{
     NTStatus status = client.LoginAsync("domain", "username", "password", cancelToken).Result;
     if (status == NTStatus.STATUS_SUCCESS)
     {
          var shares = client.ListShares(cancelToken).Result;
          //Here you can get the shares then follow above example link to access your file
     }
 }

Answer 2

Check out: https://www.nuget.org/packages/SimpleImpersonation/

Using that you can access a file share with a simple :

var credentials = new UserCredentials(domain, username, password);
var result = Impersonation.RunAsUser(credentials, logonType, () =>
{
    return System.IO.Directory.GetFiles( @"\\server\share" );
});