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Web-centric Security in APEX
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This expiration concept is based on the idea that eventually a password will be guessed or compromised Therefore, using strong encryption and choosing good passwords tend to obviate the need Workspace Password Policy The parameters in this section define a granular password policy that is applied to all administrators, developers, and end users One important concept to consider is that these password rules do not apply to end user applications using an authentication scheme other than Application Express For example, if a developer defines an authentication scheme of type LDAP for a particular application, the APEX password policy will not apply to users of that application However, if the LDAP directory has a password policy, APEX will respect it Service Administrator Password Policy This parameter affects only the APEX administration service The default value is to use the Use Default Strong Password Policy Changing this parameter to Use Policy Specified In Workspace Password Policy simply applies the custom password policy discussed in the preceding section to the APEX administration service
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The user interface for the APEX development environment is composed of several APEX applications, as APEX is written with itself These applications are assigned numbers between 4000 and 4999 Consequently, APEX prevents a developer from creating any applications in this range The two primary components to the APEX development environment are the Application Builder and the SQL Workshop The Application Builder allows developers to build web applications The SQL Workshop provides an interface where developers can browse and modify database objects, as well as execute any SQL or PL/SQL statements Commands issued from the SQL Workshop are parsed as a particular database schema for both object resolution and database privileges The schema or schemas available to a developer in the SQL Workshop are defined in the APEX administration interface by mapping a schema to an APEX Workspace The idea that a developer doesn t need to install any software is one of the reasons APEX is so easy to use, but this also makes it a particularly tempting target for a hacker as it is a web interface to the database If a nefarious person gains access to the APEX development environment, he can do a tremendous amount of damage, including exporting sensitive data, adding his own code to the schema or application to intercept and transmit data, and modifying or deleting applications or database objects Because of this, protecting the APEX development environment against unauthorized users is critical, particularly in production applications
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Preventing Unauthorized Access to the APEX Environment
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Prior to Application Express 31, the only options for protecting the development environment involved using techniques outside of APEX itself The most popular technique is using Apache mod_rewrite to redirect all requests to the APEX development environment to a different page Apache mod_rewrite allows you to chain together additional rules so you can allow access to the APEX development environment from a specific IP subnet or range and only during business hours on Monday through Friday We ll discuss mod_rewrite in detail later in this chapter in the section mod_rewrite and APEX, including specific examples Application Express 31 introduced a new installation option called a Runtime Only installation A Runtime Only installation includes all of the PL/SQL packages and metadata tables, but all of the 4000 series applications that make up the APEX user interface are removed The exception
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Part IV: Applied Security for Oracle APEX and Oracle Business Intelligence
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to this is application 4155, which allows end users to reset their passwords It also includes a documented procedure to convert to and from a Runtime Only installation, so you don t have to make this decision at install time Technically, you could delete these applications in previous versions and achieve the same goal, but then you would be left with no ability to manage any settings within the APEX environment Since there is no user interface in a Runtime Only installation, all instance configuration changes must occur using the APEX_INSTANCE_ADMIN API discussed earlier Oracle SQL Developer 121 (shown in Figure 11-5) introduced tighter integration with APEX A developer can now import/export applications and pages and modify application and page-level attributes simply by connecting to a schema associated with an APEX application using SQL Developer, and then right-clicking the application in the APEX tree These features not only enhance productivity, but they also compliment a Runtime Only installation, as there is no APEX user interface in a Runtime Only installation Calls to APEX_INSTANCE_ADMIN as well as SQL Developer features can also be tested with full installations of APEX to determine whether or not these interfaces will be acceptable before making the jump to a Runtime Only configuration Additional security measures, such as removing the APEX administration interface, tend to introduce a level of inconvenience This solution is a good example of adding security without sacrificing significant functionality or productivity
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