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Web-centric Security in APEX
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APEX comprises tables and PL/SQL packages installed in three schemas in an Oracle database The primary schema in APEX 32, APEX_030200, is where the majority of the objects are installed In prior versions, this schema used FLOWS_ as the prefix, so APEX 31 is installed in FLOWS_ 030100 The FLOWS_FILES schema contains only one table that is used to store any files uploaded through the APEX interface The third schema, APEX_PUBLIC_USER, is used by OHS to connect to the database This schema does not own any objects and has a very restricted set of privileges Once APEX is installed, you must log into the APEX administration interface and provision a workspace (Figure 11-1), which is a logical grouping of developers, applications, and schemas Each workspace can have one or more schemas assigned to it Each application within a workspace has an application-level attribute called Parse-As Schema that defines the schema or user for which all of the code within that application will execute To start, let s analyze the sequence of events that occur when an APEX application executes In doing so, we will cover many of the components in play and see how they interoperate The following URL will serve as the basis for an example of an APEX page that contains a simple report based on a SQL query: http://apexoraclecom/pls/apex/f p=100:3:6789:NO:::P3_DEPTNO:999 When you enter the URL for this page, your web browser makes a request to the OHS based on Apache (We ll talk about the embedded PL/SQL Gateway later, but the concepts are similar) Apache notices that the first part of the URL is /pls/, so it hands off control to mod_plsql, which looks at the next part of the URL, apex, and determines that it should use the APEX Database Access Descriptor (DAD) The definition of the DAD contains a database connect string as well as a username and a password hash OHS will use this username to connect to the database By default, this username is APEX_PUBLIC_USER, so if you query the username column from the v$session table in an active APEX environment, you ll see a number of sessions connected as APEX_PUBLIC_USER After you connect to the database, mod_plsql tells the database to execute the PL/SQL procedure contained in the URL APEX uses a public synonym, f, which points to the show procedure in the PL/SQL package wwv_flow owned by APEX_XXXXXX (version 32+) or FLOWS_ XXXXXX wwv_flow will then determine the application and page requested base on the colondelimited parameter string Each application has a parse as attribute that indicates in which database schema the application should operate APEX then looks at the requested page to find any objects that it should display Since this page has only a query, the APEX rendering engine then calls the protected system package SYSWWV_DBMS_SQL to execute the SQL query as the schema specified in the parse as attribute For example, if the parse as schema of your application is HR and the source of your regions is select * from employees, that will be parsed and executed with the rights of the HR user (see Figure 11-2)
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FIGURE 11-1
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Part IV: Applied Security for Oracle APEX and Oracle Business Intelligence
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APEX uses a number of pre-spawned database sessions between OHS and the database This technique is called connection pooling (see Figure 11-3) and is highly scalable, since creating new database connections is an expensive process that could add significant time to the overall page load time if a new session were created for each request In addition, each dedicated database session requires a certain amount of Program Global Area (PGA) memory on the database, which could add up to a huge amount of wasted memory for client-server systems with a large number of concurrent users
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FIGURE 11-3
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