Accessing file on network with user outside of the domain

Question

I need to access a file from a network drive with a user who may not be in the domain.

My current code is:

private async Task GetUxVersionsFromServer()
{            

    string path = @$"\\{IpAddress}\...\...\...";

    if(!await GetFiles(path))
    {
        using (UNCAccessWithCredentials unc = new UNCAccessWithCredentials())
        {
            bool retry = true;
            do
            {
                (var ok, var username, var password) = _dialogService.ShowPasswordInput();

                if (ok)
                {
                    if (unc.NetUseWithCredentials(path, username, "domain", password))
                    {
                        await GetFiles(path);
                        retry = false;
                    }
                }
                else
                {
                    retry = false;
                }

            } while (retry);
        }
    }

}

private async Task<bool> GetFiles(string path)
{
    try
    {
        var zipFiles = await Task.FromResult(System.IO.Directory.GetFiles(path, "VERSION*.zip"));
        Versions = new ObservableCollection<string>(zipFiles);

        return true;
    }
    catch (IOException)
    {
        return false;
    }
}

I use the class UNCAccessWithCredential from here

It works fine.

If the user has access to the directory, the password entry should not appear. The only problem is that I can't test if the Windows user has access to the directory without catching an exception.

Is there a way to query if the logged in Windows user has access to a network directory or not?

Is there a way to query if the logged on Windows user is in the domain?

Answer 1

Finally I solved it this way:

    private async Task GetUxVersionsFromServer()
    {

        string path = @$"\\{server}\...";


        if (Environment.UserDomainName.ToLower() != "myDomain")
        {
            bool success = false;
            bool ok;
            do
            {                    
                (bool result, var username, var password) = _dialogService.ShowPasswordInput();
                ok = result;
                if (ok)
                {
                    try
                    {
                        using (new NetworkConnection(path, new NetworkCredential($@"myDomain\{username}", password)))
                        {
                            success = await GetFiles(path);                                
                        }
                    }
                    catch (System.ComponentModel.Win32Exception ex)
                    {
                        success = false;
                    }

                } 
            } while (!success && ok);

            if(!ok)
            {
                int test = 0;
            }
        }
        else
        {
            await GetFiles(path);
        }

    }

I took the class NetworkConnection from here