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You will learn more about impersonation and delegation later in the Impersonation section For now it s important to understand that Kerberos supports both impersonation and delegation, while NTLM and other Windows authentication techniques such as Basic or Digest authentication support impersonation only The core component of a Kerberos system is the KDC (key distribution center), which is responsible for issuing tickets and managing credentials In the Windows world, an Active Directory primary domain controller plays the role of the KDC Every actor, client, and server has to trust the KDC It manages all the user and computer accounts and issues authentication tickets and session tickets for communication sessions between machines in the domain This is another big difference when comparing Kerberos to NTLM: while NTLM works for workgroup scenarios without a central authority, Kerberos requires a central authority for issuing any type of ticket.

public void testGetUsers(){ userService.removeUserByEmail(EMAIL_ADDED_USER); List<User> users = userService.getUsers(); assertNotNull(users); assertEquals(4, users.size()); } public void testAddUser(){ List<User> users = null; User user = new User(); user.setCommonName("Dustin"); user.setLastName("Robert"); user.setEmail(EMAIL_ADDED_USER); user.setUsername(USERNAME); user.setPassword("43jh8978"); users = userService.addUser(user); assertEquals(5, users.size()); } public void testGetUserByUsername(){ User user = userService.getUserByUsername(USERNAME); assertNotNull(user); assertEquals(user.getUsername(), USERNAME); } public void testRemoveUserByEmail(String email){ userService.removeUserByEmail(email); List<User> users = userService.getUsers(); assertNotNull(users); assertEquals(4, users.size()); User user = userService.getUserByUsername(USERNAME); assertNull(user); }

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Insert a new class named InventoryDALDisLayer using the Project Add Class menu option. Next, ensure you have a public class type in your new code file. Change the name of the namespace wrapping this class to AutoLotDisconnectedLayer and import the System.Data and System.Data.SqlClient namespaces. Unlike the connection-centric InventoryDAL type, this new class doesn t need to provide custom open/close methods because the data adapter handles the details automatically. Begin by adding a custom constructor that sets a private string variable representing the connection string. Also, define a private SqlDataAdapter member variable, which you configure by calling a (yet to be created) helper method called ConfigureAdapter(), which takes a SqlDataAdapter output parameter: namespace AutoLotDisconnectedLayer { public class InventoryDALDisLayer { // Field data. private string cnString = string.Empty; private SqlDataAdapter dAdapt = null; public InventoryDALDisLayer(string connectionString) { cnString = connectionString; // Configure the SqlDataAdapter. ConfigureAdapter(out dAdapt); } } }

Therefore, for Kerberos to work, you require a connection to an Active Directory domain controller Figure 22-4 shows the flow for authenticating a user and then establishing a session between the client and the simple member server of a domain Every user authentication process starts with submitting a request to the authentication service, which runs on the KDC This request contains the user name of the user to be authenticated The KDC reads the user s master key from the security account database Again, this is the hashed version of the user s password Afterward, it creates a TGT (ticket-granting ticket) This ticket contains a session key for the user s session as well as an expiration date and time Before the ticket is returned to the client, the server encrypts it using the user s master key.

When you use a data adapter to modify tables in a DataSet, the first order of business is to assign the UpdateCommand, DeleteCommand, and InsertCommand properties with valid command objects (until you do so, these properties return null references) Configuring the command objects manually for the InsertCommand, UpdateCommand, and DeleteCommand properties can entail a significant amount of code, especially if you use parameterized queries Recall from 21 that a parameterized query allows you to build a SQL statement using a set of parameter objects Thus, if you were to take the long road, you could implement ConfigureAdapter() to create three new SqlCommand objects manually, each of which contains a set of SqlParameter objects At this point, you could set each object to the UpdateCommand, DeleteCommand, and InsertCommand properties of the adapter Visual Studio 2010 provides several designer tools to take care of this mundane and tedious code on your behalf.

With only the correct password entered on the client, the client operating system can create the correct the master key (the hash) for successfully decrypting the TGT received from the server If decryption of the TGT succeeds on the client, the user is authenticated successfully Finally, the client caches the TGT locally..

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