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Webapp showing files on fileshare with impersonation

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Last Modified: 2013-11-08
Hi,

I have a webapp that shows files from a fileshare. The authenticated windows user has permissions to read from the share, but the ASP.NET process hasn't. So I have this code with impersonation which works on my development environment. But in production environment it doesn't. Looking in the security event viewer on the fileserver I can see that it is the ANONYMOUS LOGON account which logs on to the fileserver.

Can you spot where I go wrong or perhaps suggest an alternative solution. Mind you, I can't change permissions on the share.

Thanks,

peter


WindowsIdentity winId = (WindowsIdentity)HttpContext.Current.User.Identity;
WindowsImpersonationContext ctx = null;
try {
// Start impersonating.
	ctx = winId.Impersonate();
	
// Now impersonating.
// Access resources using the identity of the authenticated user.
	FileStream fs = new FileStream(uri, FileMode.Open, FileAccess.Read, FileShare.Read);
	Response.ContentType = "application/pdf";

	byte[] buf = new byte[1024];
	int i;
	while ((i = fs .Read(buf, 0, buf.Length)) > 0) Response.OutputStream.Write(buf, 0, i);
	
	Response.Flush();
	Response.Close();
} catch (Exception ex) {
// Prevent exceptions from propagating.
} finally {
// Revert impersonation.
	if (ctx != null) ctx.Undo();
}
// Back to running under the default ASP.NET process identity.

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