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Data access layer (PL/SQL)
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Figure 15-1. A schema design that separates the end user, data access layer, and data schemas
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CHAPTER 15 SECURITY-RELATED ISSUES
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As illustrated in Figure 15-1, the data schema owns the tables and the data within these tables. The data access layer contains PL/SQL code to manipulate data. The PL/SQL packages in this schema have privileges to insert, delete, update, and select data as required on appropriate tables they need to work on. The end user accounts are given privileges only to execute the PL/SQL packages they need to execute to get their job done. In the next section, we ll look at an application example that illustrates the concepts we ve covered so far.
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Figure 15-2 shows our example application architecture. Application users clerk1 and manager1 map to the database schemas db_clerk1 and db_manager1, respectively. The schema db_data_access_layer consists of PL/SQL code with privileges to manipulate data stored in a third schema called db_app_data. The schema db_clerk1 has the role clerk_role, which can execute the package clerk_pkg. The user db_manager1 has the role manager_role, which can execute the packages clerk_pkg and manager_pkg.
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Application
Database
can manipulate
Execu tes via clerk db_data_access_layer _role
clerk1
db_clerk1
db_app_data
clerk_pkg manager_pkg
a ia m tes v nage r e _rol
Exec
manager1
db_manager1 manager_role can execute clerk_pkg and manager _pkg clerk_role can only execute clerk_pkg
Figure 15-2. Our example application architecture Our rather simplistic HR application consists of two PL/SQL packages that allow a user to perform various actions on the emp and dept tables. The package manager_pkg allows a user to add a department, hire an employee, raise a salary, and so on. The package clerk_pkg allows a user to list the employee and department details.
CHAPTER 15 SECURITY-RELATED ISSUES
The architecture shown in Figure 15-2 illustrates the following: Use of database roles to control end user access to the application functionality: For example, the user db_manager1 has the privileges to execute both packages, manager_pkg and clerk_pkg, via the roles manager_role and clerk_role. However, the user db_clerk1 only needs to report on the data, not modify it, so that user is given the minimum necessary privileges to perform these tasks. This user can execute only clerk_pkg via the role clerk_role. Separation of the data and the application logic that accesses that data into two distinct schemas: The schema db_app_data contains the application objects (the emp and dept tables) and the application data. The schema db_data_access_layer contains the application API to access data in the schema db_app_data. In our example, this API consists of the two PL/SQL packages clerk_pkg and manager_pkg. As discussed earlier, the main advantage of creating two separate schemas for data and the data access layer code is that we can grant only the minimum required privileges on db_app_data objects to the db_data_access_layer schema. For example, as shown in the design in Figure 15-2, the db_data_access_layer schema cannot drop the tables emp and dept. Thus, we uphold the principle of maintaining the least privileges needed to get the job done. Let s go ahead and create all the schema objects from scratch, and then we ll demonstrate how the application actually authenticates to the database in order to perform the requested actions, focusing on the proxy authentication technique.
Creating the Database Schemas
Let s begin by logging in as sys and creating an admin account with the dba role. This account s only use is to create other accounts in the database used by our application.
Caution In this example, all passwords are the same as the username. This is obviously a bad idea in a
real-life application.
sys@ORA10G> create user admin identified by admin default tablespace users; User created. sys@ORA10G> grant dba to admin; Grant succeeded. As discussed, we will have two schemas: db_app_data and db_data_access_layer. The schema db_app_data contains all the application objects (in our case, just tables) used in our application. The schema db_data_access_layer contains all the code (PL/SQL API) that works on the tables in the schema db_app_data. After connecting as admin, we create the db_app_data schema. admin@ORA10G> create user db_app_data identified by db_app_data default tablespace users quota unlimited on users; User created.
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