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The database may be heavily guarded, but in most cases, a privileged account will be used by the application to view and change data If the application programmer doesn t understand the sensitive nature of the data, it may be exposed to unauthorized access, regardless of good security at the database level Habits are hard to break: If you ve done something a certain way for years, it can be hard to change that behavior If your team has always granted SELECT privileges at the database level because it s simpler than figuring out which specific tables are required, it may be difficult to change the process Even if you get team members together and explain a new policy and its significance, you may find that people subconsciously revert to the mechanism they know best This also applies to a habit of not giving security proper attention.

Figure 21-3. Tables mapping control access permissions In this example, the database is configured with the information for two user levels: User and Admin. The different menu structures these users will see are shown in Figure 21-4.

First, add an Application Configuration File to the project. Right-click the app.config file in Visual Studio, and choose the Edit Enterprise Library Configuration menu item. This will pop open a new frame in the right pane.

Acceptance of risk: Willingness to take risks can also be another reason for lack of good security If a database administrator thinks there is little chance someone will find and gain access to the database, or be interested in toying with the data, she may not bother expending any effort on security After all, what are the chances that someone will find the machine on the network.

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Figure 21-4. Different menu structures By pulling all the user permission logic out of the user interface and placing it in the database, it becomes very easy to write a small amount of generic code that automatically configures the user interface for the user who is currently logged on: // Get permissions for an Admin-level user. DataTable dtPermissions = DBPermissions.GetPermissions(DBPermissions.Level.Admin); // Update the menu with these permissions. MenuLockDown.SearchMenu(MainMenuStrip.Items, dtPermissions); The DBPermissions class uses a static GetPermissions() function that returns a table with all the security information for the specified user level. To remove the chance of error, it also uses an enumeration that defines the different levels of user access in the database. public class DBPermissions { public enum State { Normal = 0, Disabled = 1, Hidden = 2 } public enum Level { Admin, User }

private static SqlConnection con = new SqlConnection( Properties.Settings.Default.DBConnectionString); public static DataTable GetPermissions(Level userLevel) { // Permissions isn't actually a table in the data source. // Instead, it's a view that combines the important information // from all three tables using a Join query. string selectPermissions = "SELECT * FROM Permissions WHERE LevelName=@LevelName"; SqlCommand cmd = new SqlCommand(selectPermissions, con); SqlParameter param = new SqlParameter("@LevelName", Enum.GetName(typeof(Level), userLevel)); cmd.Parameters.Add(param); SqlDataAdapter adapter = new SqlDataAdapter(cmd); DataSet ds = new DataSet(); adapter.Fill(ds, "Permissions"); return ds.Tables["Permissions"]; } } Finally, the SearchMenu() function recursively tunnels through the menu, hiding or disabling controls as indicated in the permissions table. public class MenuLockDown { public static void SearchMenu(ToolStripItemCollection items, DataTable dtPermissions) { DataRow[] rowMatch; foreach (ToolStripItem item in items) { // Skip separators and other controls ToolStripMenuItem mnuItem = item as ToolStripMenuItem; if (mnuItem != null) { // See if this menu item has a corresponding row. rowMatch = dtPermissions.Select("ControlName = '" + mnuItem.Name + "'"); // If it does, configure the menu item state accordingly. if (rowMatch.GetLength(0) > 0) { DBPermissions.State state; state = (DBPermissions.State)int.Parse( rowMatch[0]["State"].ToString());

Caution Don t be fooled by a statement like, Our site is completely public, so there s no need to protect

Note You can also edit the app.config file using the Enterprise Library Configuration tool at Start All Programs Microsoft patterns & practices Enterprise Library 4.1 October 2008 Enterprise Library Configuration.

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