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SEC_ADMIN@AOS> grant execute on custom_apex_auth to sec_user; Grant succeeded
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Part IV: Applied Security for Oracle APEX and Oracle Business Intelligence
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Now that all of the code is in place, the final step is to create a new authentication scheme in APEX that leverages this code To create a new authentication scheme in an application, navigate to Shared Components | Security | Authentication Schemes Create a new authentication scheme, select From Scratch, and name it Custom Table-Based Edit the newly created authentication scheme and scroll down to the Login Processing section and enter the following code in the Authentication Function attribute (as shown in Figure 12-1):
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return custom_apex_authvalidate_user
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The default login page for a new application is page 101 The next two attributes assume that your login page is also 101 If it is not, be sure to substitute the correct value of your login page Select page 101 for the Session Not Valid attribute and make sure the Session Not Valid URL attribute is blank Set the Logout URL attribute to the following string:
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wwv_flow_custom_auth_stdlogout p_this_flow=&APP_ID&p_next_flow_page_sess=&APP_ ID:101:&APP_SESSION
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Save this authentication scheme To activate this authentication scheme, click the Change Current tab on the Authentication Schemes page, and then select Custom Table-Based To test the new authentication scheme, simply run the application and log in with a username of tyler and password of welcome or any valid username and password that you created with the CUSTOM_ APEX_AUTH package
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Authorization Schemes
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APEX authorization schemes offer a powerful and flexible solution to allow or deny access selectively to any component of an application Their design encourages developers to define the logic for authorization at the application level and then apply that logic where it is needed The more this code is centralized and reused, the easier it is to review, audit, and change in the event that security requirements change To define an authorization scheme, navigate to the Shared Components section of an application Authorization Schemes are listed in the Security section, just under Authentication Schemes A developer can create authorization schemes based on values of APEX items, SQL queries, or PL/SQL functions Once you create an authorization scheme and give it a unique name, this name will appear in the authorization scheme select list attribute of every APEX object that supports this feature A partial list of APEX objects that support authorization schemes includes applications, pages, regions, report columns, list entries, and page items
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FIGURE 12-1
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Custom authentication scheme
12:
Secure Coding Practices in APEX
When an authorization scheme fails for a given user, the effect differs, depending on the type of object to which it is applied For an application or page, APEX will return an error to any user that violates the authorization scheme All other objects, such as report columns, regions, items, and buttons, will simply not appear on the page for users that do not pass the authorization scheme This allows you to hide navigational elements or actions that a user cannot perform Note that simply hiding a list item or tab that links to an administrative page is not enough, however, as the user could simply enter the page in the URL The authorization scheme should also be applied to the page If a nefarious user tries to access a page for which she is not authorized, the APEX will display the error message associated with the authorization scheme In the following example, we create an Authorization scheme based on a PL/SQL function This function uses the APEX_LDAP package to query an LDAP directory and return the Organizational Unit of a person Based on the value of this attribute, we conditionally allow access to certain parts of the application Two users are involved in this scenario: Kathy Evans (IT Security) and Robert Smith (Human Resources) Here is the code for the authorization scheme (also shown in Figure 12-2):
declare l_attributes wwv_flow_globalvc_arr2; l_attribute_values wwv_flow_globalvc_arr2; begin -- "ou" is the attribute we are interested in l_attributes(1) := 'ou'; apex_ldapget_user_attributes( p_username => :APP_USER, -- APEX User p_pass => null, p_auth_base => 'ou=people,dc=example,dc=com', p_host => '127001', p_port => 389, p_attributes => l_attributes, p_attribute_values => l_attribute_values); if l_attribute_values(1) = 'Human Resources' then return true; else return false; end if; end;
Here s how to implement this code as an authorization scheme: 1 Navigate to the Shared Components section of an application 2 Select Authorization Schemes 3 Create a new authorization scheme with the name In HR Org 4 Under Scheme Type, select PL/SQL Function Body Returning a Boolean 5 Enter the code in the preceding listing in the Expression 1 attribute 6 Provide an error message
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