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Secure Coding Practices in APEX
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In the following example, we will create a simple table to store users and their roles When a user logs into our APEX application, we will store the role in an APEX item We will then reference the value of this APEX item in a function used for a VPD policy If the user s role is ADMINISTRATOR, he will see all rows in the table If his role is READ, he will see only his own row All others, such as a user that access this table from a reporting tool, will not see any rows
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SYS@AOS> grant create any context to sec_admin; SYS@AOS> grant execute on sysdbms_rls to sec_admin; -- Execute the following DDL as schema SEC_ADMIN create table sec_adminuser_app_roles( id char(32), user_name varchar2(255), role_name varchar2(255), constraint user_app_roles_pk primary key (id), constraint user_app_roles_uq unique(user_name,role_name), constraint user_app_roles_ck check (role_name in ('ADMINISTRATOR', 'READER')) ) / create or replace trigger bi_user_app_roles before insert on user_app_roles for each row begin :newid := sys_guid(); :newuser_name := upper(:newuser_name); :newrole_name := upper(:newrole_name); end; /
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insert into user_app_roles (user_name,role_name) values ('DGRANT','ADMINISTRATOR'); insert into user_app_roles (user_name,role_name) values ('JWHALEN','READER'); commit; grant select on sec_adminuser_app_roles to sec_user; create or replace function sec_adminemployees_apex_item_fn ( p_schema in varchar2 default null, p_object in varchar2 default null) return varchar2 as l_return varchar2(255) := '1 = 2';-- by default, this will return no rows l_role varchar2(255); begin -- A few basic tests to see if it looks like an APEX Session if v('APP_USER') = sys_context('userenv','client_info')
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Part IV: Applied Security for Oracle APEX and Oracle Business Intelligence
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and regexp_instr(sys_context('userenv','module'), '^APEX:APPLICATION[[:space:]][0-9]+$') > 0 then -- ROLE_NAME is an APEX Application Level Item Its value -- is set using an APEX Application Process if v('ROLE_NAME') = 'ADMINISTRATOR' then l_return := '1 = 1'; -- all rows elsIf v('ROLE_NAME') = 'READER' then l_return := 'email = v('' APP_USER'')'; -- only their own row else l_return := '1 = 2'; -- no rows end if; end if; return l_return; end; / -- The following 2 drop statements will drop the policies used in both -- examples from this section to make sure we have a clean slate begin dbms_rlsdrop_policy (object_schema => 'DATA_OWNER', object_name => 'EMPLOYEES', policy_name => 'EMPLOYEES_APEX_ITEM'); end; / begin dbms_rlsdrop_policy (object_schema => 'DATA_OWNER', object_name => 'EMPLOYEES', policy_name => 'EMPLOYEES_CONTEXT'); end; / begin dbms_rlsadd_policy (object_schema => 'DATA_OWNER', object_name => 'EMPLOYEES', policy_name => 'EMPLOYEES_APEX_ITEM', policy_function => 'EMPLOYEES_APEX_ITEM_FN'); end; /
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This function EMPLOYEES_APEX_ITEM_FN references an APEX item named ROLE_NAME Figure 12-11 shows the process that sets this item
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Session Context-based Policy
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The next example illustrates the use of a session context variable This technique is a more traditional approach to VPD and has an advantage in that it is applicable to other technologies such as Oracle Forms The main disadvantage of this technique when used with APEX is that the function used to set a user s context is called on every page view If this function is expensive, it could have a negative impact on performance However, if you are running Oracle Database 11g
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Secure Coding Practices in APEX
FIGURE 12-11
Application level, before header process to set the role
or later, you can use the Function Result Cache feature to cache the results and greatly improve performance
create or replace context sec_adminemployees_context using set_employees_context / create or replace procedure sec_adminset_employees_context as begin dbms_sessionset_context('EMPLOYEES_CONTEXT','ROLE_NAME', null); for c1 in (select role_name from sec_adminuser_app_roles where user_name = sys_context('userenv','client_info')) loop dbms_sessionset_context('EMPLOYEES_CONTEXT','ROLE_NAME', c1role_name); end loop; end; /
Part IV: Applied Security for Oracle APEX and Oracle Business Intelligence
grant execute on sec_adminset_employees_context to sec_user; create or replace function sec_adminemployees_context_fn ( p_schema in varchar2 default null, p_object in varchar2 default null) return varchar2 as l_return varchar2(255) := '1 = 2';-- by default, this will return no rows l_role varchar2(255); begin if sys_context('EMPLOYEES_CONTEXT','ROLE_NAME') = 'ADMINISTRATOR' then l_return := '1 = 1'; -- all rows elsIf sys_context('EMPLOYEES_CONTEXT','ROLE_NAME') = 'READER' then l_return := 'email = sys_context(''userenv'',''client_info'')'; -- only their own row else l_return := '1 = 2'; -- no rows end if; return l_return; end; / -- The following 2 drop statements will drop the policies used in both -- examples from this section to make sure we have a clean slate begin dbms_rlsdrop_policy (object_schema object_name policy_name end; / begin dbms_rlsdrop_policy (object_schema object_name policy_name end; / begin dbms_rlsadd_policy (object_schema object_name policy_name policy_function end; / -- APEX Components
=> 'DATA_OWNER', => 'EMPLOYEES', => 'EMPLOYEES_APEX_ITEM');
=> 'DATA_OWNER', => 'EMPLOYEES', => 'EMPLOYEES_CONTEXT');
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