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A busy system with hundreds or even thousands of concurrent users may have only 15 30 active database sessions at any given time These sessions are continually reused by different application users until they reach the time-out period configured in the PlsqlIdleSessionCleanupInterval variable located within the plsqlconf file It defaults to 15 minutes As an end user navigates from page to page in an APEX application, the user will likely use a different database session for each page view These sessions are simply reused from the connection pool so a new session is not created for each page view or each new user This is quite different from a client-server application, where a new database session is created for each user when the client application connects to the database The same session is typically used as long the client application is running Connection pooling also changes a developer s perspective when it comes to security Traditionally, users of a client-server application, such as Oracle Forms, each connect to a different schema These schemas are usually a one-to-one mapping with the users In contrast, all users of an APEX application connect through the same schema Another key differentiator between APEX and client-server technologies is the stateless nature of the web In a client-server environment such as Oracle Forms, a persistent connection exists between the client application and the database If the network was severed between the application and the database, the database would know it In a pure web environment such as APEX, the connection is stateless When an end user requests a page, the request is sent from the web browser to OHS, and then on to the database The APEX engine will process the request and return the desired page At that point, a connection between the web browser and OHS or the database no longer exists In essence, the sequence goes like this: Request, Response, Disconnect Understanding these concepts is critical to understanding the architecture of APEX and consequently making informed decisions when designing a security strategy
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Traditional database developers and database administrators are likely accustomed to using database roles to grant privileges on objects A DBA might grant select on a set of tables to a role, and then grant the role to the database schema used by an application This scenario will not work in APEX, however, because the underlying packages that APEX used to parse SQL statements as other users did not support roles The database packages were recently enhanced to support this functionality, so it is only a matter of time before these changes are reflected throughout APEX Developers are often troubled by this concept, because they typically test queries or PL/SQL procedures in SQL*Plus or SQL Developer first The same query or procedure call may fail when executed from an APEX region or process The reason for this error is that since APEX does not support roles, all privileges on objects must be explicit direct object grants to the parsing schema of an APEX application Fortunately, a simple command is available in SQL*Plus and SQL Developer to help debug this particular situation Typing set role none and pressing ENTER in SQL*Plus, or pressing F5 in SQL Developer, will remove all roles from your current session and any implicit privileges granted through roles To illustrate this point, here s a simple example:
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system@aos> create role hr_viewer; Role created system@aos> grant select on hremployees to hr_viewer; Grant succeeded system@aos> grant hr_viewer to demo; Grant succeeded system@aos> grant select on hrdepartments to demo; Grant succeeded
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Part IV: Applied Security for Oracle APEX and Oracle Business Intelligence
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This grants SELECT privileges on two tables in the HR schema to the DEMO user Permissions for SELECT on HREMPLOYEES were granted to the role HR_VIEWER We then granted this role to the DEMO user In contrast, the last line grants SELECT on HRDEPARTMENTS to DEMO using a direct object grant Another way to look at this is that the privileges on EMPLOYEES are implicit, as they are inherited from a role, whereas the privileges on DEPARTMENTS are explicit Now let s connect as DEMO to see how this might impact an APEX application:
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demo@aos> select count(*) from hremployees; COUNT(*) ---------107 demo@aos> set role none; Role set demo@aos> select count(*) from hremployees; select count(*) from hremployees * ERROR at line 1: ORA-00942: table or view does not exist demo@aos> select count(*) from hrdepartments; COUNT(*) ---------27
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Note that once all role-based privileges are removed from the session, DEMO can no longer query HREMPLOYEES, yet DEMO can still query HRDEPARTMENTS
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