Bài giảng Bảo mật cơ sở dữ liệu - Database Security and Auditing: Protecting Data Integrity and Accessibility - Chapter 7 Database Auditing Models

Nội dung text: Bài giảng Bảo mật cơ sở dữ liệu - Database Security and Auditing: Protecting Data Integrity and Accessibility - Chapter 7 Database Auditing Models

1. Database Security and Auditing: Protecting Data Integrity and Accessibility Chapter 7 Database Auditing Models
2. Objectives • Gain an overview of auditing fundamentals • Understand the database auditing environment • Create a flowchart of the auditing process • List the basic objectives of an audit Database Security and Auditing 2
3. Objectives (continued) • Define the differences between auditing classifications and types • List the benefits and side effects of an audit • Create your own auditing models Database Security and Auditing 3
4. Auditing Overview • Audit examines: documentation that reflects (from business or individuals); actions, practices, conduct • Audit measures: compliance to policies, procedures, processes and laws Database Security and Auditing 4
5. Definitions • Audit/auditing: process of examining and validating documents, data, processes, procedures, systems • Audit log: document that contains all activities that are being audited ordered in a chronological manner • Audit objectives: set of business rules, system controls, government regulations, or security policies Database Security and Auditing 5
6. Definitions (continued) • Auditor: person authorized to audit • Audit procedure: set of instructions for the auditing process • Audit report: document that contains the audit findings • Audit trail: chronological record of document changes, data changes, system activities, or operational events Database Security and Auditing 6
7. Definitions (continued) • Data audit: chronological record of data changes stored in log file or database table object • Database auditing: chronological record of database activities • Internal auditing: examination of activities conducted by staff members of the audited organization • External auditing Database Security and Auditing 7
8. Auditing Activities • Evaluate the effectiveness and adequacy of the audited entity • Ascertain and review the reliability and integrity of the audited entity • Ensure the organization complies with policies, procedures, regulations, laws, and standards of the government and the industry • Establish plans, policies, and procedures for conducting audits Database Security and Auditing 8
9. Auditing Activities (continued) • Keep abreast of all changes to audited entity • Keep abreast of updates and new audit regulations • Provide all audit details to all company employees involved in the audit • Publish audit guidelines and procedures • Act as liaison between the company and the external audit team Database Security and Auditing 9
10. Auditing Activities (continued) • Act as a consultant to architects, developers, and business analysts • Organize and conduct internal audits • Ensure all contractual items are met by the organization being audited • Identify the audit types that will be used Database Security and Auditing 10
11. Auditing Activities (continued) • Identify security issues that must be addressed • Provide consultation to the Legal Department Database Security and Auditing 11
12. Auditing Environment • Auditing examples: – Financial auditing – Security auditing • Audit also measures compliance with government regulations and laws • Audits take place in an environment: – Auditing environment – Database auditing environment Database Security and Auditing 12
13. Auditing Environment (continued) • Components: – Objectives: an audit without a set of objectives is useless – Procedures: step-by-step instructions and tasks – People: auditor, employees, managers – Audited entities: people, documents, processes, systems Database Security and Auditing 13
14. Auditing Environment (continued) Database Security and Auditing 14
15. Auditing Environment (continued) Database Security and Auditing 15
16. Auditing Environment (continued) • Database auditing environment differs slightly from generic auditing environment • Security measures are inseparable from auditing Database Security and Auditing 16
17. Auditing Process • Quality Assurance (QA): – Ensure system is bug free and functioning according to its specifications – Ensure product is not defective as it is being produced • Auditing process: ensures that the system is working and complies with the policies, regulations and laws Database Security and Auditing 17
18. Auditing Process (continued) • Performance monitoring: observes if there is degradation in performance at various operation times • Auditing process flow: – System development life cycle – Auditing process: • Understand the objectives • Review, verify, and validate the system • Document the results Database Security and Auditing 18
19. Auditing Process (continued) Database Security and Auditing 19
20. Auditing Process (continued) Database Security and Auditing 20
21. Auditing Objectives • Part of the development process of the entity to be audited • Reasons: – Complying – Informing – Planning – Executing Database Security and Auditing 21
22. Auditing Objectives (continued) • Top ten database auditing objectives: – Data integrity – Application users and roles – Data confidentiality – Access control – Data changes Database Security and Auditing 22
23. Auditing Objectives (continued) • Top ten database auditing objectives (continued): – Data structure changes – Database or application availability – Change control – Physical access – Auditing reports Database Security and Auditing 23
24. Auditing Classifications and Types • Industry and business sectors use different classifications of audits • Each classification can differ from business to business • Audit classifications: also referred as types • Audit types: also referred as purposes Database Security and Auditing 24
25. Audit Classifications • Internal audit: – Conducted by a staff member of the company being audited – Purpose: • Verify that all auditing objectives are met • Investigate a situation prompted by an internal event or incident • Investigate a situation prompted by an external request Database Security and Auditing 25
26. Audit Classifications (continued) • External audit: – Conducted by a party outside the company that is being audited – Purpose: • Investigate the financial or operational state of the company • Verify that all auditing objectives are met Database Security and Auditing 26
27. Audit Classifications (continued) • Automatic audit: – Prompted and performed automatically (without human intervention) – Used mainly for systems and database systems – Administrators read and interpret reports; inference engine or artificial intelligence • Manual audit: performed completely by humans • Hybrid audit Database Security and Auditing 27
28. Audit Types • Financial audit: ensures that all financial transactions are accounted for and comply with the law • Security audit: evaluates if the system is as secure • Compliance audit: system complies with industry standards, government regulations, or partner and client policies Database Security and Auditing 28
29. Audit Types (continued) • Operational audit: verifies if an operation is working according to the policies of the company • Investigative audit: performed in response to an event, request, threat, or incident to verify integrity of the system • Product audit: performed to ensure that the product complies with industry standards Database Security and Auditing 29
30. Benefits and Side Effects of Auditing • Benefits: – Enforces company policies and government regulations and laws – Lowers the incidence of security violations – Identifies security gaps and vulnerabilities – Provides an audit trail of activities – Provides means to observe and evaluate operations of the audited entity Database Security and Auditing 30
31. Benefits and Side Effects of Auditing (continued) • Benefits (continued): – Provides a sense of security and confidence – Identifies or removes doubts – Makes the organization more accountable – Develops controls that can be used for purposes other than auditing Database Security and Auditing 31
32. Benefits and Side Effects of Auditing (continued) • Side effects: – Performance problems – Too many reports and documents – Disruption to the operations of the audited entity – Consumption of resources, and added costs from downtime – Friction between operators and auditor – Same from a database perspective Database Security and Auditing 32
33. Auditing Models • Can be implemented with built-in features or your own mechanism • Information recorded: – State of the object before the action was taken – Description of the action that was performed – Name of the user who performed the action Database Security and Auditing 33
34. Auditing Models (continued) Database Security and Auditing 34
35. Simple Auditing Model 1 • Easy to understand and develop • Registers audited entities in the audit model repository • Chronologically tracks activities performed • Entities: user, table, or column • Activities: DML transaction or logon and off times Database Security and Auditing 35
36. Simple Auditing Model 1 (continued) Database Security and Auditing 36
37. Simple Auditing Model 1 (continued) • Control columns: – Placeholder for data inserted automatically when a record is created or updated (date and time record was created and updated) – Can be distinguished with a CTL prefix Database Security and Auditing 37
38. Simple Auditing Model 1 (continued) Database Security and Auditing 38
39. Simple Auditing Model 2 • Only stores the column value changes • There is a purging and archiving mechanism; reduces the amount of data stored • Does not register an action that was performed on the data • Ideal for auditing a column or two of a table Database Security and Auditing 39
40. Simple Auditing Model 2 (continued) Database Security and Auditing 40
41. Advanced Auditing Model • Called “advanced” because of its flexibility • Repository is more complex • Registers all entities: fine grained auditing level • Can handle users, actions, tables, columns Database Security and Auditing 41
42. Advanced Auditing Model (continued) Database Security and Auditing 42
43. Advanced Auditing Model (continued) Database Security and Auditing 43
44. Historical Data Model • Used when a record of the whole row is required • Typically used in most financial applications Database Security and Auditing 44
45. Historical Data Model (continued) Database Security and Auditing 45
46. Auditing Applications Actions Model Database Security and Auditing 46
47. C2 Security • Given to Microsoft SQL Server 2000 • Utilizes DACLs (discretionary access control lists) for security and audit activities • Requirements: – Server must be configured as a C2 system – Windows Integrated Authentication is supported – SQL native security is not supported – Only transactional replication is supported Database Security and Auditing 47
48. Summary • Audit examines, verifies and validates documents, procedures, processes • Auditing environment consists of objectives, procedures, people, and audited entities • Audit makes sure that the system is working and complies with the policies, standards, regulations, and laws • Auditing objectives established during development phase Database Security and Auditing 48
49. Summary (continued) • Objectives: compliance, informing, planning, and executing • Classifications: internal, external, automatic, manual, hybrid • Models: Simple Auditing 1, Simple Auditing 2, Advanced Auditing, Historical Data, Auditing Applications, C2 Security Database Security and Auditing 49