Book Image

Oracle 11g Anti-hacker's Cookbook

By : Adrian Neagu
Book Image

Oracle 11g Anti-hacker's Cookbook

By: Adrian Neagu

Overview of this book

For almost all organizations, data security is a matter of prestige and credibility. The Oracle Database is one of the most rich in features and probably the most used Database in a variety of industries where security is essential. To ensure security of data both in transit and on the disk, Oracle has implemented the security technologies to achieve a reliable and solid system. In Oracle 11g Anti-Hacker's Cookbook, you will learn about the most important solutions that can be used for better database security."Oracle 11g Anti-hacker's Cookbook" covers all the important security measures and includes various tips and tricks to protect your Oracle Database."Oracle 11g Anti-hacker's Cookbook" uses real-world scenarios to show you how to secure the Oracle Database server from different perspectives and against different attack scenarios. Almost every chapter has a possible threads section, which describes the major dangers that can be confronted. The initial chapters cover how to defend the operating system, the network, the data and the users. The defense scenarios are linked and designed to prevent these attacks. The later chapters cover Oracle Vault, Oracle VPD, Oracle Labels, and Oracle Audit. Finally, in the Appendices, the book demonstrates how to perform a security assessment against the operating system and the database, and how to use a DAM tool for monitoring.
Table of Contents (16 chapters)
Oracle 11g Anti-hacker's Cookbook
About the Author
About the Reviewers

Controlling client connections using the TCP.VALIDNODE_CHECKING listener parameter

The usage of the valid node checking security feature is very similar to the TCP wrappers presented in Chapter 1, Operating System Security. Using this capability, you can deny or the allow connecting clients based on IP address or hostname.

Getting ready

All steps will be performed on nodeorcl1.

How to do it...

  1. Open $ORACLE_HOME/network/admin/sqlnet.ora and enable valid node checking by setting TCP.VALIDNODE_CKECINK as follows:

  2. Next, you can establish the hosts that will be allowed to connect by setting the TCP.INVITED_NODES parameter as follows:

    TCP.INVITED_NODES= {nodeorcl5}
  3. After you add the invited nodes you must reload the listener configuration.

    lsnrctl reload
  4. If we want to establish a connection from a node that is not included in the invited node list, the ORA-12537: TNS:connection closed error will be thrown as follows:

    oraclient@nodeorcl2:~> sqlplus hr/hr@HCKDB