Accessing a file on a network drive
- by Rekreativc
Hello.
Background: I have an application that has to read from files on a network drive (Z:)
This works great in my office domain, however it does not work on site (in a different domain). As far as I can tell the domain users and network drives are set in the same way, however I do not have access to users etc in the customers domain.
When I couldn't access the network drive I figured I needed a token for a user. This is how I impersionate the user:
[DllImport("advapi32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
public static extern bool LogonUser(String lpszUsername, String lpszDomain, String lpszPassword, int dwLogonType, int dwLogonProvider, ref IntPtr phToken);
...
const string userName = "Razvoj02";
const string pass = "Programer02";
const string domainName = null;
const int LOGON32_PROVIDER_DEFAULT = 0;
const int LOGON32_LOGON_INTERACTIVE = 2;
IntPtr tokenHandle = new IntPtr(0);
bool returnValue = LogonUser(userName, domainName, pass,
LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT,
ref tokenHandle);
if (!returnValue)
throw new Exception("Logon failed.");
WindowsImpersonationContext impersonatedUser = null;
try
{
WindowsIdentity wid = new WindowsIdentity(tokenHandle);
impersonatedUser = wid.Impersonate();
}
finally
{
if (impersonatedUser != null) impersonatedUser.Undo();
}
Now here is the interesting/weird part. In my network the application can already access the network drive, and if I try to impersonate the active user (exactly the same user, including the same domain) it will not be able to access the network drive.
This leaves me helpless since now I have no idea what works and what doesn't, and more to the point, will it work on site?
What am I missing?
