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Apart from the three basic permissions, some advanced permissions can also be applied. The first is Set User ID (SUIDs). When this permission is applied to a program file, it allows the program file to run with the rights of the owner of the file. This permission is useful if applied to /bin/passwd, because it permits a user to change his password in the file /etc/shadow that is only writable for root. SUID can, however, be a disaster if not applied in the right way. This is because it can create a backdoor for hackers. Imagine the rather strange situation in which SUID is applied to the default shell /bin/bash. Since root is the owner of /bin/bash, it gives root-permissions to every user that uses /bin/bash. Of course, a clever hacker will never apply SUID to /bin/bash as a backdoor. He will instead apply it to some program file that isn t used very often. SGID (set group ID, S) is the second of the advanced permissions. It is basically the same as SUID, with the sole difference that it gives a program the rights of the group that is owner of the program when it is executed. Both SUID and SGID can be useful for your operating system. I advise you never to apply them for yourselves. The last of the three special permissions is the sticky bit (t). If applied to a directory, the meaning should be that a user can only remove files from this directory if he is the owner of the file, or has specific write permissions. This feature however is not implemented in most Linux file systems and for that reason it makes no sense to apply the sticky bit to directories.

context to a particular procedure is to ensure that the values set in the context can come from only your procedure. As an example, let s extend the VPD policy so that users see only the bug records assigned to them (unless they are an administrator) and only those records in a particular state: Open or Closed. First, create the vpd_context_procedure procedure, which will be used to set the context, as shown in Listing 5-10. Listing 5-10. Creating the Procedure to Set the Context apexdemo@DBTEST> create or replace 2 procedure vpd_context_procedure( 3 p_status in varchar2 default null) 4 as 5 begin 6 dbms_session.set_context('VPD_CONTEXT', 7 'STATUS', 8 p_status); 9 end; 10 / This procedure accepts a single parameter, p_status. Then, in the dbms_session.set_context procedure, it sets the value of the STATUS parameter in the VPD_CONTEXT context to the value passed into the p_status parameter.

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If you want to apply Linux permissions from the command line, use the chmod command. This command can be used in two modes: the absolute mode and the relative mode. If applied in absolute mode, the permissions you want to apply are written as numbers. If you prefer the

Listing 13-6. Modified User.cs File #region Using directives using System; using System.Collections.Generic; using System.Text; #endregion namespace BusinessLayer { public class User { private string userName; private string password; public User() { } public User(string userName, string password) { this.userName = userName; this.password = password; } } } Lastly, you need to enhance the UserTests class to pass a username and password to the UserData class. Since this is a test, you need to create test data that you feel confident will not exist in the database. That way, you can set up the data and remove it when your test has completed safely. You will refactor the database connections better later, but for now, you will take the simplest approach possible. Listing 13-7 shows the modifications to the UserTests.cs file. Listing 13-7. Modified UserTests.cs File #region Using directives using System; using System.Collections.Generic; using System.Data; using System.Data.Odbc; using System.Text; using NUnit.Framework; using BusinessLayer; using DataLayer; #endregion

relative mode, the permission is denoted by its abbreviation. Most experienced Linux administrators prefer absolute mode, since it s clearer what happens. Use of relative mode can, however, be practical once in a while. As mentioned, numbers are used in absolute mode to refer to permissions. This should be a four-digit number: the first digit refers to the special permissions, the second refers to the permissions of the owner of the file, the third refers to the permissions of the group-owner of the file, and the fourth refers to the permissions of other. Alternatively, you can also use a three-digit number. If that s the case, the digits refer to owner, group, and others, respectively. To know what number you have to use in absolute mode, you have to know the value used to represent a permission. This is shown in Table 4-6.

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