how to create barcode in asp.net c# create or replace function is_apex_session_two return number authid definer as begin in Java

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create or replace function is_apex_session_two return number authid definer as begin
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Secure Coding Practices in APEX
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if sys_context('userenv','session_user') in ('ANONYMOUS','APEX_PUBLIC_USER') and sys_context('userenv','module') = 'APEX:APPLICATION 123' and sys_context('userenv','ip_address') = '1921681123' then return 1; else return 0; end if; end is_apex_session_two; /
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Before creating a new audit policy to associate this function with a table, we will drop the policy created in the preceding example:
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BEGIN DBMS_FGADROP_POLICY (object_schema object_name policy_name END; /
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=> 'SEC_USER', => 'EMPLOYEES', => 'IS_FROM_APEX_POLICY');
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Now we can create a new policy for this function:
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begin dbmS_FGAadd_policy (object_schema object_name policy_name audit_condition audit_column statement_types enable end; /
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=> => => => => => =>
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'SEC_USER', 'EMPLOYEES', 'IS_FROM_APEX_POLICY_TWO', 'SEC_ADMINIS_APEX_SESSION_TWO = 0', null, 'INSERT,UPDATE,DELETE,SELECT', true);
As you will recall, the SQL Workshop is Application 4500 and our policy is checking to make sure the query is coming from Application 123 Querying the EMPLOYEES table from the SQL Workshop should trigger an audit event:
-- Executed in the Application Express SQL Workshop select * from employees where 1 = 1;
I added the predicate 1 = 1 to show that the full SQL text is captured in the audit trail Now query the audit trail to verify that a new event was logged:
SQL> select timestamp,db_user, client_id, scn, sql_text from sysdba_fga_audit_trail; DB_USER CLIENT_ID ---------- ---------------------SEC_USER ANONYMOUS TMUTH:3528968924651999 SCN ------4638186 6009443 SQL_TEXT ----------------------------------select * from employees select * from employees where 1 = 1
Part IV: Applied Security for Oracle APEX and Oracle Business Intelligence
Note that the new row in the audit trail was issued by the database user ANONYMOUS, which typically means it s coming from APEX using the Embedded PL/SQL Gateway Also note that APEX sets CLIENT_ID to the APEX User and APEX Session ID number that is captured in the audit trail You might wonder why I included SCN (System Change Number) as a column in this example My goal was to hint at a powerful concept that is a bit beyond the scope of this chapter, and that is to combine FGA with the Oracle database Flashback feature and, new in 11g, Flashback Data Archive Flashback is designed to retain historical data for short periods say, a week or less which provides DBAs many more options for data recovery Flashback is also a great compliment to FGA in that it allows you to put your session back in time Since the audit trail provides both the SCN and the query, we could put our session back to that time and run the same query to see exactly what data was displayed in a security breach Flashback Data Archive extends this concept as it is designed to retain data for much longer periods, measured in months or years The following code is a quick example of how the code is used for this scenario:
exec DBMS_FLASHBACKENABLE_AT_SYSTEM_CHANGE_NUMBER(6009443); select * from employees where 1 = 1;
FGA Example 3
One parameter of DBMS_FGAADD_POLICY we haven t explored yet is HANDLER_MODULE While this parameter is not directly related to APEX, the functionality it provides is significant enough to deserve an example HANDLER_MODULE is designed to be able to send alerts when an audit event occurs Without the ability to send alerts, a security administrator needs to review the audit logs on a regular basis to detect suspicious events HANDLER_MODULE allows you to define a PL/SQL procedure that is called every time an audit event occurs The PL/SQL procedure must conform to the following signature:
procedure_name( object_schema in VARCHAR2, object_name in VARCHAR2, policy_name in VARCHAR2);
Our example procedure will use the database package UTL_MAIL In 11g, this package is not installed by default Installation instructions for this package are detailed in the Oracle Database PL/SQL Packages and Types Reference You will also need to set the initialization parameter SMTP_OUT_SERVER and grant execute on UTL_MAIL to SEC_ADMIN The following procedure is an example handler module that collects as much information as possible about the session that triggered the audit event and e-mails that information to one or more security administrators:
create or replace procedure fga_notify ( schema_name in varchar2, table_name in varchar2, policy_name in varchar2) as l_msg varchar2(32767); -- the t_row function accepts name / value pairs and returns them -- as an HTML table row with 2 cells function t_row( p_label in varchar2, p_data in varchar2)
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