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address my CD-ROM drive. I found out from another Linux system that the associated major and minor were 22 and 0. With this information, you can use the command mknod to create your own devices. In this case, I used mknod /dev/hdc b 22 0 to restore access to my CD-ROM drive. You can even use mknod to create entirely new devices.

Figure 4-35. Creating a new authorization scheme As when you define the logic for a condition, you can select from different authorization scheme types, such as Exists SQL Query and PL/SQL Function Returning a Boolean. The list of types is nowhere near as comprehensive as the list of condition types, but it is usually sufficient to cover the vast majority of authorization schemes you might want to create.

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etc: Most services running on Linux use an ASCII text file to store all necessary configurations. These text files are kept in the directory /etc, as shown in Figure 4-11. In this directory are important configuration files like /etc/passwd which contains the database of local Linux users. You ll also find configuration files here for all other important services, like httpd.conf, which stores the configuration of your Apache web server. /etc also holds many subdirectories. If a service uses more than one configuration file, it normally creates a subdirectory in which all these files are stored. Almost all configuration files of OES - Linux are installed somewhere under /etc/novell.

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Figure 4-11. Important configuration files like the user database /etc/passwd are stored in /etc or one of its subdirectories.

As shown in Figure 4-36, name the new scheme USER_IS_ADMIN and choose the Exists SQL Query scheme type. For Expression 1, use the same query as the one you used earlier (Listing 4-2) for the Exists (SQL query returns at least one row) condition. You also must specify an error message that will be displayed to the user when the authorization scheme fails. Supplying an error message is mandatory for an authorization scheme, unlike with a condition.

home: On any server, there must be a place for the user home directories. In UNIX, the directory /home is used for this purpose. In most cases, to prevent a user from accidentally filling up the entire file system, a separated partition is created for this directory. lib: Many programs used in a Linux environment share some of their code. This shared code is stored in different library files. All the libraries needed by binaries in a subdirectory of your file system root are contained in the directory /lib. Other important modules can be found in this directory as well, like the driver modules used by the kernel of your server and the security modules used by the PAM (Pluggable Authentication Modules) mechanism.

Figure 4-36. Defining the authorization scheme logic An important configuration setting you can define for an authorization scheme is called the evaluation point, as shown in Figure 4-37. You can use the evaluation point setting to define whether the authorization scheme logic should be reevaluated every time you view a page that uses it or evaluated only once per session. For this example, choose once per session.

Want to know which modules are used by a certain binary Type ldd. For example, find out which Tip libraries are used by /bin/bash by typing ldd /bin/bash. It will show that all the libraries it uses are in /lib, as shown in Figure 4-12.

Figure 4-37. Defining an evaluation point When you choose once per session for the evaluation point, the result of the authorization scheme is cached, and the cached value is used whenever an element references the authorization scheme. If the logic you are using in your scheme is particularly time-consuming and the results won t tend to change that often, taking advantage of the caching facility will lead to a much more responsive application for the user. For example, if the logic takes one second to

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Figure 4-12. With ldd, you can find out exactly which libraries are used by a certain command. media: On a Linux system, to access files that are not on the hard disk of your computer, you need to mount the medium they are on. When you mount, for example, a CD-ROM, you connect it to some directory on your file system. This must be a directory that exists before you start mounting anything. Most Linux distributions use the directory /mnt for this purpose. SUSE Linux, on the other hand, uses /media to mount foreign file systems.

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