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The User is Authenticated (not public) condition evaluates to true if the user has successfully authenticated to the application using the current authentication scheme, which can be either one of the built-in schemes or a custom authentication scheme. A typical use of this type of condition is to display different information to users depending on whether or not they are logged in to your application. For example, you might have a navigation menu that gives extra options to people after they have logged in. The previous example showed how to display the Logout link only if users are currently on page 1 or 5. A far more sensible choice would be to display the Logout link only if the user has actually logged in (is authenticated), as shown in Figure 4-28.

Security and Users: Here you can find the option to create local Linux users and manage security settings. Notice there is a VPN option as well, which allows you access to an easy interface to initiate a VPN connection. There is also an option to manage the Certificate Authority for your SLES machine. In an OES environment, however, it s more logical to use the corporate CA installed in eDirectory and import server certificates signed by this CA. You can read more about this subject in 12. Misc: This option contains some useful programs, such as an interface to the system log where all system errors are recorded, and CD Creator, which helps you burn CDs. On OES - Linux, YaST is the main configuration tool. It s the recommended way to configure Linux-related settings for your server. To do its work, YaST makes modifications to the configuration files used by the related Linux services. YaST also uses many variables. These variables allow YaST to manage your system in a coherent fashion for example, the variable NETWORK_INTERFACE defines the name of the network interface. These variables are typically defined in configuration files under /etc/sysconfig and are called from the specific configuration files themselves. The use of these variables allows you to manage all important information for your system at one specific location, instead of through lots of different files. As an administrator, you should be aware of this mechanism, because you can seriously mess up the configuration

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User Is the Public User (User Has Not Authenticated)

5. Another important limitation that can be applied to user accounts is the login time restriction (see Figure 9-5). With this option, you can limit the times users can be logged in to the network. With a login time restriction, you can make it impossible for users to log in to the network or use network resources at times they shouldn t be logged in to the network. This can be useful if your company is closed on the weekend. On the other hand, it can be impractical if a user needs to work after normal office hours. You can set a login time restriction by Shift-clicking anywhere in the matrix of available login times.

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Figure 9-5. With a proper login time restriction, you can prevent unauthorized logins at times when users shouldn t be logged in. 6. Apart from restricting users from logging in during certain time periods, it s also possible to restrict logins from certain addresses. This feature is useful for users that need some special security, like the company s accountant. It can also be used to prevent remote login from unknown addresses. To set a network address restriction, click the plus (+) sign. A pop-up window appears where you can choose from the different available address types. All current (and even less current) address types are available. Enter the desired address and then click Add to add it to the list of addresses the user is allowed to log in from.

The User is the Public User (user has not authenticated) condition is the reverse of the User is Authenticated (not public) type. It will evaluate to true if the user is not authenticated to the application. Here, Public User refers to whether the username is the same as the username that is specified in the DAD in your Apache configuration file, which is used to connect to the database. This username will typically be something like HTMLDB_PUBLIC_USER (if you have upgraded from an older version of APEX) or APEX_PUBLIC_USER; if you are using Oracle XE, it will typically be defined as ANONYMOUS. At the application level, you can set which value to use for Public User, as shown in Figure 4-29. Whenever the APP_USER variable equals the same value as you have specified at the application level, the user is deemed to be a public user.

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