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Figure 15-4 A proxy connection carrying three sessions We will use our sample application to demonstrate the proxy authentication concept We first create a database account to connect to the database on behalf of end users This account is separate from the end user database accounts (db_manager1 and db_clerk1 in our application) and is called midtier in our example: admin@ORA10G> create user midtier identified by midtier; User created The account midtier is the proxy account that connects on behalf of all end users to the database from the middle-tier application hosted on an application server As per the principle of least privilege, we should give it the minimum privilege to get the job done That privilege is the create session privilege, which allows it to connect to the database: admin@ORA10G> grant create session to midtier; Grant succeeded.

scheduledPartsDisplayed = partsList.TotalNumberOfScheduledParts; } } int vehiclesToAssembleDisplayed = 0; void ShowVehiclesReadyForAssembly() { System.Messaging.Message[] messages = router.GetVehicleAssemblyMessages(); if (vehiclesToAssembleDisplayed == messages.Length) return; System.Messaging.XmlMessageFormatter formatter; formatter = new System.Messaging.XmlMessageFormatter(new Type[] {typeof(WorkOrder)} ); listViewVehiclesToAssemble.Items.Clear(); foreach (System.Messaging.Message message in messages) { message.Formatter = formatter; WorkOrder workOrder = message.Body as WorkOrder; ListViewItem item = new ListViewItem(workOrder.Id); listViewVehiclesToAssemble.Items.Add(item); } vehiclesToAssembleDisplayed = messages.Length; } } // class ScheduledPart public class ScheduledPart { public WorkOrder workOrder; public string part; public DateTime deliveryDate; public string Id { get {return workOrder.Id;} } public ScheduledPart(WorkOrder theWorkOrder, string thePart, DateTime theDeliveryDate) { workOrder = theWorkOrder; part = thePart; deliveryDate = theDeliveryDate; } }

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The code stops users from moving the pivot table fields to a different location in the PivotTable Field List. It also prevents adding or removing fields in the pivot table layout. To allow layout changes again, create and run a similar macro that sets the DragTo properties to True. In addition to the security features discussed in this and previous sections, you can programmatically control access to the following features: PivotTable Field List Field Settings Refresh Ribbon s PivotTable Tools contextual tabs Show Details The following macro turns off each of these features. Store the macro on a regular code module. Sub RestrictPTChanges() Dim pt As PivotTable Application.EnableEvents = False Set pt = ActiveSheet.PivotTables(1)

To enable the end user account, db_manager1, to be able to be proxied by the account midtier, we need to alter the db_manager1 account as follows: admin@ORA10G> -- allow connecting through proxy account admin@ORA10G> alter user db_manager1 grant connect through midtier with role manager_role, clerk_role; User altered The preceding alter statement in effect says that the user midtier can connect with the privileges of db_manager1 without supplying the db_manager1 password, and during this connection it can enable only the roles manager_role and clerk_role This means that when the application is proxying for db_manager1 via the account midtier, only two specific roles can be enabled: manager_role and clerk_role Restricting the roles in this manner ensures that the application can enable only the roles with the minimum privileges to do its job.

// class WorkerPartsList public class WorkerPartsList { // key is WorkOrder ID, value is an ArrayList of ScheduledParts Hashtable partsList = new Hashtable(); public Hashtable List { get {return partsList;} } // number of WorkOrders that are waiting for parts public int NumberOfWorkOrders { get {return partsList.Count;} } // number of WorkOrders that are waiting for parts public int TotalNumberOfScheduledParts { get { int count = 0; foreach (ArrayList scheduledParts in partsList.Values) count += scheduledParts.Count; return count; } } public void AddPart(WorkOrder theWorkOrder, string thePart, DateTime theDeliveryDate) { ScheduledPart part = new ScheduledPart(theWorkOrder, thePart, theDeliveryDate); // see if this WorkOrder already has pending parts ArrayList pendingParts = partsList[theWorkOrder.Id] as ArrayList; if (pendingParts == null) { // no: create a new list and add it to the list pendingParts = new ArrayList(); partsList.Add(theWorkOrder.Id, pendingParts); } pendingParts.Add(part); } public void Remove(WorkOrder theWorkOrder) { partsList.Remove(theWorkOrder.Id); }

We issue the same alter statement to the user db_clerk1; however, this time we allow only clerk_role to be enabled during the proxy connection admin@ORA10G> alter user db_clerk1 grant connect through midtier with role clerk_role; User altered..

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