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The authentication process features four different instances, and they are reflected in Listing 5-10. Authentication is handled in the first instance; these are the lines that start with the keyword auth. During the authentication phase, the user login name and password are first checked, followed by the validity of the account and other account-related parameters (such as login time restrictions). This happens in the lines that start with account. Then, all settings relating to the password are verified (the lines that start with password). Last, the settings relating to the establishment of a session with resources are defined; this happens in the lines that start with session. The procedure that will be followed upon completion of these four instances is defined by calling the different PAM modules. This occurs in the last column of the example configuration file in Listing 5-10. For example, the module pam_securetty can be used to verify that the user root is not logging in to a Linux computer via an insecure terminal. The keywords sufficient, optional, required, and requisite are used to qualify the degree of importance that the conditions in a certain module are met. Except for the first four lines (which refer to the connection a PAM has to make to an LDAP server), conditions defined in all modules must

Note Linux is a pretty faithful clone of Unix. If you were to travel back in time 20 or 30 years, you would

When the stored procedure executes, the RAISERROR statement raises an error, which is converted to an exception by ADO.NET. The exception is handled by Catch ex As System.Data.SqlClient.SqlException Dim str As String str = "Source: " + ex.Source.ToString str += ControlChars.NewLine + "Number: " + ex.Number.ToString str += ControlChars.NewLine + "Message: " + ex.Message str += ControlChars.NewLine + "Class: " + ex.Class.ToString str += ControlChars.NewLine + "Procedure: " + ex.Procedure str += ControlChars.NewLine + "Line Number: " + ex.LineNumber.ToString str += ControlChars.NewLine + "Server: " + ex.Server MessageBox.Show(str, "Database Exception")

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find that using Unix on those old mainframe computers, complete with their teletype interfaces, would be similar to using Linux on your home PC. Many of the fundamental concepts of Linux, such as the file system hierarchy and user permissions, are taken directly from Unix.

be met; they are all required. Without going into detail, this means that authentication will fail if one of the conditions implied by the specified module is not met. When enabling a server for logon to an LDAP server (as in the example in Listing 5-10), four lines are added to the default PAM configuration file in /etc/pam.d/login. They are the first four lines, and they offer an alternative for valid authentication by using the pam_ldap.so module. Passing the conditions imposed by these first four modules is sufficient to authenticate successfully, but it is not required. Sufficient in this context means that if, for example, the instance auth passes all the conditions defined in pam_ldap.so, that s enough for local authentication. The local Linux authentication mechanism will no longer be used because the user can authenticate against the LDAP server in this case. For this to work, you of course need a valid user account that has all the required Linux properties on the LDAP server.

Torvalds liked Unix because of its power, and he liked Minix because it ran on his computer. Minix was created by Andrew Tanenbaum, a professor of computing, to demonstrate the principles of operating system design to his students. Because Minix was also a learning tool, people could also view the source code of the program the original listings that Tanenbaum had entered to create the software. Minix was lacking in some significant areas. Many people, including Torvalds, found using it very frustrating. Torvalds decided to create from scratch his own version of Minix, but to make it better, avoiding what many considered the pitfalls of Minix. He managed to produce version 0.01 of Linux in just over half a year.

Now you ll see what happens when a statement in a stored procedure encounters an error. You ll create a stored procedure that attempts an illegal INSERT, and then you ll extract information from the SqlException object. 1. Using SSMSE, create a stored procedure in Northwind named sp_DbException_2, as follows: create procedure sp_DBException_2 as set nocount on insert into employees ( employeeid, Firstname ) values (50, 'Cinderella') 2. Insert the code in Listing 16-5 into the button4_Click method. Listing 16-5. button4_Click() Dim conn As SqlConnection = New SqlConnection _ ("Data Source=.\sqlexpress;" & _ "Integrated Security=True;" & _ "database=northwind") 'create command Dim cmd As SqlCommand = conn.CreateCommand 'Specify that a stored procedure is to be executed cmd.CommandType = CommandType.StoredProcedure cmd.CommandText = "sp_DbException_2"

Note Configuring LDAP is beyond the scope of this book, but have a look at www.padl.com, for example,

Note Most clones or implementations of Unix are named so that they end in an x. One story has it that

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