qr code generator with logo javascript Part IV: Applied Security for Oracle APEX and Oracle Business Intelligence in Java

Creation QR-Code in Java Part IV: Applied Security for Oracle APEX and Oracle Business Intelligence

Part IV: Applied Security for Oracle APEX and Oracle Business Intelligence
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A word of caution before we get into the details of instance level settings: All the settings on this page apply to the whole APEX instance and affect every workspace Some of the settings can disable the APEX graphical user interface, thus removing your ability to revert the setting Before we start changing any settings, I will demonstrate the command line interface in case you need to revert any setting that has locked you out of the web interface Fortunately, you can change all of the settings from a command line interface as long as you have SQL*Plus access to the database and a database account that has been granted the role APEX_ADMINISTRATOR_ROLE The APEX_INSTANCE_ADMIN package is owned by the APEX schema and is used to set and get the value of any instance-level parameter:
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APEX_INSTANCE_ADMINGET_PARAMETER( p_parameter IN VARCHAR2) RETURN VARCHAR2; APEX_INSTANCE_ADMINSET_PARAMETER( p_parameter IN VARCHAR2, p_value IN VARCHAR2 DEFAULT 'N');
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The following examples demonstrate the use of APEX_INSTANCE_ADMIN: $ sqlplus system Enter password: ******* -- The APEX_030200 schema is locked by default and should remain that way SQL> alter session set current_schema=APEX_030200; SQL> set serveroutput on declare l_value varchar2(4000); begin l_value :=apex_instance_adminget_parameter('PASSWORD_NOT_LIKE_WORDS'); dbms_outputput_line('PASSWORD_NOT_LIKE_WORDS: '||l_value); end; / PASSWORD_NOT_LIKE_WORDS: oracle:hello:welcome:guest:user:database
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The Security page is divided into seven regions with the following parameters: Set Workspace Cookie [YES | NO] By default, APEX sets a persistent cookie in a developer s browser to remember the last workspace and username used to log into the APEX development environment This is a convenience to developers, and as long as strong password policy is enforced, the default value of YES represents only a minor decrease in security Disable Administrator Login [YES | NO] Warning: Once this parameter is set to YES, the only way to set it back to NO is through the command line API APEX_INSTANCE_ ADMIN This setting disables the APEX administration interface In some circumstances, this may be desirable, such as in an organization that hosts a lot of workspaces yet needs to allow developers to access the development environment This would prevent someone from using a brute-force attack to guess an administrator password and gain access to the interface For production instances, consider using a runtime only installation of APEX Allow Public File Upload [YES | NO] This applies only to applications that do not use any type of authentication, so that all users are anonymous At first glance, file upload into the database seems relatively harmless, since the first threat that comes to mind is someone uploading a file with a virus, yet there is no way to execute a file inside the database that mitigates this risk However, consider the possibility of someone uploading a bunch of large files At the very least, this will be very resource intensive At some point, the tablespace used by the APEX_FILES schema will fill, which is essentially a denial-of-service attack Restrict Access by IP Address This parameter allows an administrator to limit the IP addresses that have access to the development environment The wildcard character (*) can be used only at the end of the string such as 1921681* or 192* It allows you quickly to limit access to a particular subnet, or perhaps internal-only IP address in the case of Internet-facing instances However, if possible, use other techniques, such as Apache mod_rewrite in addition to this parameter, that are more flexible and will stop traffic at the HTTP server before it reaches the database
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Part IV: Applied Security for Oracle APEX and Oracle Business Intelligence
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Require HTTPS [YES | NO] Warning: This setting can disable access to APEX This parameter applies only to the APEX development and administration environment, not to a custom application built with APEX The default value of NO allows developers to use the APEX development environment and administration interface without the HTTPS protocol When set to YES, the HTTPS flag is set in the APEX development interface cookie, thus requiring HTTPS to access the development interface It s important first to configure HTTPS in the HTTP server and verify that it is working properly If HTTPS is not configured in the HTTP server and this parameter is set to YES, all connections to the APEX development and administration environments will be denied We discuss how to configure the HTTP Server for HTTPS/SSL later in this chapter Maximum Session Length in Seconds This is the total time in seconds a web session is valid regardless of activity While it does prevent someone, in particular a third party, from attempting to reuse an old session, it can also be a big inconvenience to developers For most development environments, a value of 8 hours, or 28,800 seconds, is adequate, as the Maximum Session Idle Time in Seconds parameter is more relevant for protecting the environment Maximum Session Idle Time in Seconds This parameter defines the maximum time a developer session can sit idle before it times out In doing this, it addresses a more common security risk in most internal development environments, wherein a developer leaves his or her terminal unlocked and unattended for a long period of time By setting this parameter to a relatively short time, such as 20 minutes, or 1200 seconds, you can help to mitigate this risk This leaves a relatively short window of time for someone to find and access an unattended workstation Domain Must Not Contain The expected value for this parameter is a colon-delimited list of domains that cannot be used in APEX regions of type URL or web service requests The primary use case for this feature is to prevent applications developed on hosted environments in a DMZ from access internal sites For example, suppose all of your internal domain names end in internal-appcom and you host an APEX development instance that is accessible outside of your organization This parameter prevents callouts from the database to any domain named internal-appcom Keep in mind the callout from a web service or URL region originates from the database and has nothing to do with the HTTP server While this feature is convenient, it is no substitute for firewall rules defined at the network level to prevent these types of requests Require User Account Expiration and Locking By default, each workspace administrator can set this parameter at the workspace level When this parameter is set to YES at the instance level, it overrides all workspace-level settings Maximum Login Failures Allowed Once an end user exceeds the number defined by this parameter, the user s account is locked and can be unlocked only by a workspace administrator This parameter applies to APEX administrators and developers only A value between 3 and 5 should allow for the occasional typo, yet not allow enough changes for someone to guess passwords Account Password Lifetime (Days) This parameter defines the numbers of days that a developer s password is valid before the password must be changed If you use Secure Sockets Layer (SSL) and strong passwords, setting this to a larger number is reasonable
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