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You can get an account token in two main ways. The most common approach is to retrieve the token for the currently authenticated user. You can access this token through the current security context, using the WindowsIdentity.Token property. Tokens are represented in .NET as IntPtr objects, which are representations of pointers to unmanaged memory locations. However, you never need to interact with this directly. Instead, you simply need to pass the token to the WindowsIdentity.Impersonate() method. Here s an example that extracts the token for the current user: Dim token As IntPtr = (CType(User.Identity, WindowsIdentity)).Token The only other way to get a user token is to programmatically log in with a specific user name and password. Unfortunately, .NET does not provide managed classes for logging a user in. Instead, you must use the LogonUser() function from the unmanaged Win32 security API. To use the LogonUser() function, you must first declare it as shown here: <DllImport("c:\Windows\System32\advapi32.dll")> _ Public Shared Function LogonUser(ByVal lpszUserName As String, ByVal lpszDomain As String, ByVal lpszPassword As String, ByVal dwLogonType As Integer, ByVal dwLogonProvider As Integer, <System.Runtime.InteropServices.Out()> ByRef phToken As Integer) As Boolean ... End Function As you can see, the LogonUser() function exists in advapi32.dll. It takes a user name, domain, password, logon type, and logon provider input parameters, along with an output parameter that allows you to access the token following a successful logon. The parameter names aren t important. In this example, the somewhat cryptic names from the Windows API reference are used. A Boolean result is returned to indicate whether the logon was successful.

If you call this from your Main() method and reprint the table, you should find these two test records are no longer displayed.

Windows XP or later operating systems impose restrictions on the use of blank passwords to prevent network-based attacks. As a result of these restrictions, you won t be able to use the LogonUser() function to impersonate an account with a blank password.

Note If you run this app twice and call the AddRecord() method each time, you get a VIOLATION CONSTRAINT ERROR because the AddRecord() method tries to insert the same CarID primary key value each time. If you wish to make this example more flexible, you can gather data from the user.

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Once you have imported the LogonUser() function, you can use it in your code to log the user in, as shown here: ' Define required variables. Dim user As String = "matthew" Dim password As String = "secret" Dim machine As String = "FARIAMAT" Dim returnedToken As Integer ' Try to log on. If LogonUser(user, machine, password, 3, 0, returnedToken) Then ' The attempt was successful. Get the token. Dim token As New IntPtr(returnedToken) End If Note that you must convert the integer value returned by LogonUser() into an IntPtr in order to use it with the WindowsIdentity.Impersonate() method.

Let s look at one more example of using the strongly typed object model. In this case, you create a final method that invokes the GetPetName stored procedure. When the data adapters for the AutoLot database were created, there was a special class created named QueriesTableAdapter, which as the name implies, encapsulates the process of invoking stored procedures in the relational database. This final helper function displays the name of the specified car when called from Main(): public static void CallStoredProc() { QueriesTableAdapter q = new QueriesTableAdapter(); Console.Write("Enter ID of car to look up: "); string carID = Console.ReadLine(); string carName = ""; q.GetPetName(int.Parse(carID), ref carName); Console.WriteLine("CarID {0} has the name of {1}", carID, carName); } At this point, you know how to use strongly typed database types, and package them up into a dedicated class library. You can find more aspects of this object model to play around with, but you should be in a perfect position to dig deeper if that interests you. To wrap things up for this chapter, you will learn how to apply LINQ queries to an ADO.NET DataSet object.

If everything is fine, let's try to write some Java code using the standard JDBC framework. To do that, create another simple Maven project called usermanager (just as we did in 4 for the hellofilippo application), using Eclipse as shown in Figure 5-5.

Once you have an account token, you can use the WindowsIdentityImpersonate() method to start impersonating the corresponding identity You can use the Impersonate() method in two ways You can use the Shared version, which requires an account token Alternatively, you can use the instance version, which impersonates the identity represented by the corresponding WindowsIdentity object In either case, the Impersonate() method returns a WindowsImpersonationContext object that has a single function it allows you to revert to the original identity by calling its Undo() method Here s an example of programmatic impersonation at its simplest, using the Shared version of the Impersonate() method: Dim impersonateContext As WindowsImpersonationContext impersonateContext = WindowsIdentityImpersonate(token) ' (Now perform tasks under the impersonated ID ' This code will not be able to perform any task ' that the user would not be allowed to do) impersonateContext.

You have seen in this chapter that you can manipulate the data within a DataSet in three distinct manners: By using the Tables, Rows, and Columns collections By using data table readers By using strongly typed data classes

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