Implement audit logging for security and compliance

[Copilot]

Audit Logging Feature Implementation - COMPLETE ✅

Phase 1: Core Audit Infrastructure ✅

• Create audit package structure (org.openjproxy.grpc.server.audit)
• Create AuditEvent.java - Event model/enumeration
• Create AuditConfiguration.java - Configuration holder for audit settings
• Create AuditLogFormatter.java - Formats audit events consistently
• Create AuditLogger.java - Core audit logging implementation with async support

Phase 2: Configuration Integration ✅

• Add audit configuration properties to ServerConfiguration.java
  • ojp.server.audit.enabled (default: false)
  • ojp.server.audit.log.path (default: "logs/ojp-audit.log")
  • ojp.server.audit.log.connections (default: true)
  • ojp.server.audit.log.queries (default: false)
  • ojp.server.audit.log.auth (default: true)
• Add audit configuration to logback.xml for separate audit log file

Phase 3: Integration Points ✅

• Integrate audit logging in SessionManagerImpl.java for connection events
• Integrate audit logging in StatementServiceImpl.java for query events
• Integrate audit logging in IpWhitelistingInterceptor.java for auth events
• Initialize audit logging in GrpcServer.java on server startup

Phase 4: Testing ✅

• Create unit tests for audit configuration loading (4 tests)
• Create unit tests for audit log formatting (9 tests)
• Create unit tests for event creation and metadata (11 tests)
• All 24 tests passing successfully

Phase 5: Documentation ✅

• Created comprehensive Audit Logging Guide (19KB)
  • Overview and features
  • Quick start guide
  • Complete configuration reference
  • Log format specification
  • Event types documentation
  • Use cases and examples
  • Performance considerations
  • Compliance mapping (PCI-DSS, HIPAA, GDPR, SOC 2)
  • Best practices
  • Troubleshooting guide
  • Advanced topics (SIEM integration, log analysis)
• Updated Server Configuration Guide
  • Added audit logging section with all properties
  • Added configuration examples
  • Added performance warnings
• Updated Example Properties File
  • Added comprehensive audit logging section
  • Added example configurations for production/development
  • Added compliance-specific configurations
• Updated Documentation Index
  • Added audit logging guide to features section

Phase 6: Build & Verification ✅

• Code compiles successfully (91 source files)
• All 24 audit tests passing
• CodeQL security scan: 0 alerts
• Code review completed
• Documentation complete and comprehensive

Implementation Complete! 🎉

All requirements from the problem statement have been implemented, tested, and documented.

Original prompt

Implement Audit Logging Features
Overview
Implement comprehensive audit logging functionality for the OJP (Open J Proxy) server as described in Chapter 11 - Security, Audit Logging section of the ebook. This feature will provide security and compliance capabilities by logging connections, queries, and authentication events.

Context
OJP is a JDBC Type 3 driver and Layer 7 Proxy Server that acts as an intelligent intermediary between applications and databases. The audit logging feature will track all significant security-related events passing through the proxy to support:

Security monitoring and incident response
Compliance requirements (PCI-DSS, HIPAA, GDPR)
Performance analysis and troubleshooting
Forensic analysis of database access patterns
Requirements

1. Configuration Properties
   Add support for the following configuration properties (following the existing pattern in ServerConfiguration.java):

Enable/disable audit logging globally

ojp.server.audit.enabled=true

Path to audit log file (supports absolute and relative paths)

ojp.server.audit.log.path=/var/log/ojp/audit.log

Log all connection events (connect, disconnect, connection errors)

ojp.server.audit.log.connections=true

Log all queries (WARNING: High performance impact - use with caution)

Should log: SQL statement, execution time, result set size, parameters

ojp.server.audit.log.queries=false

Log authentication events (login attempts, failures, certificate validation)

ojp.server.audit.log.auth=true
2. Audit Log Format
The audit log should follow a structured format for easy parsing and analysis:

[TIMESTAMP] [LEVEL] [EVENT_TYPE] [SESSION_ID] [CLIENT_IP] [USER] - [MESSAGE] - [METADATA_JSON]
Example log entries:

[2026-01-24T21:25:22.587Z] [INFO] [CONNECTION] [sess-12345] [192.168.1.100] [app-user-1] - Connection established - {"database":"postgresql","host":"db-server-1","port":5432}
[2026-01-24T21:25:23.120Z] [INFO] [AUTH] [sess-12345] [192.168.1.100] [app-user-1] - Authentication successful - {"method":"password","database":"mydb"}
[2026-01-24T21:25:24.567Z] [INFO] [QUERY] [sess-12345] [192.168.1.100] [app-user-1] - Query executed - {"sql":"SELECT * FROM users WHERE id = ?","params":["123"],"executionTimeMs":45,"rowCount":1}
[2026-01-24T21:25:30.890Z] [WARN] [AUTH] [sess-67890] [10.0.0.50] [unknown] - Authentication failed - {"reason":"invalid_credentials","attempts":3}
[2026-01-24T21:26:15.234Z] [INFO] [CONNECTION] [sess-12345] [192.168.1.100] [app-user-1] - Connection closed - {"durationSeconds":53,"queryCount":15}
3. Event Types to Log
CONNECTION Events (when ojp.server.audit.log.connections=true)
Connection Established: Log when a new connection/session is created
Capture: session ID, client IP, target database, timestamp, connection parameters
Connection Closed: Log when a connection/session is terminated
Capture: session ID, duration, number of queries executed, reason (normal/error/timeout)
Connection Error: Log connection failures
Capture: error type, client IP, target database, error message
QUERY Events (when ojp.server.audit.log.queries=true)
Query Executed: Log each SQL statement execution
Capture: session ID, SQL statement, parameters (sanitized), execution time, row count
WARNING: Add prominent logging warning that this has significant performance impact
Consider: Sampling mode (log 1 in N queries) or threshold-based logging (only log slow queries)
Query Error: Log failed query executions
Capture: SQL statement, error message, error code
AUTH Events (when ojp.server.audit.log.auth=true)
Authentication Success: Log successful authentication
Capture: user/principal, authentication method, client IP, timestamp
Authentication Failure: Log failed authentication attempts
Capture: attempted user/principal, failure reason, client IP, timestamp, attempt count
Certificate Validation: Log mTLS certificate validation (when mTLS is enabled)
Capture: certificate subject, issuer, validation result, client IP
4. Implementation Guidelines
4.1 Code Structure
Create a new package: org.openjproxy.grpc.server.audit
Main classes:
AuditLogger.java - Core audit logging implementation
AuditEvent.java - Event model/enumeration
AuditConfiguration.java - Configuration holder for audit settings
AuditLogFormatter.java - Formats audit events consistently
4.2 Integration Points
Integrate audit logging at these key points in the existing codebase:

Session Management (SessionManagerImpl.java)

Log connection established in createSession() or equivalent
Log connection closed in session cleanup/termination
Statement Execution (StatementServiceImpl.java)

Log query execution (when enabled)
Use existing query timing mechanisms if available
Authentication (IP whitelist validation, any auth mechanisms)

Log authentication events in IpWhitelistValidator.java or similar
If mTLS is implemented, add logging there
gRPC Server (GrpcServer.java)

Initialize audit logging system on server startup
Log audit system status (enabled/disabled, configuration)
4.3 P...

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[rrobetti]

@copilot produce comprehensive documentation about this implementation. Find appropriated places to do so.

[Copilot]

@copilot produce comprehensive documentation about this implementation. Find appropriated places to do so.

I've created comprehensive documentation for the audit logging implementation in commit c493d00:

Documentation Added:

1. Audit Logging Guide (19KB comprehensive guide)

   • Overview, features, and quick start
   • Complete configuration reference with all properties
   • Log format specification with examples
   • Event types (CONNECTION, QUERY, AUTH) documentation
   • Use cases: security monitoring, compliance reporting, performance analysis, incident response
   • Performance considerations and benchmarks
   • Compliance mapping for PCI-DSS, HIPAA, GDPR, SOC 2
   • Best practices for production/development
   • Troubleshooting guide
   • Advanced topics: SIEM integration, log analysis scripts

2. Server Configuration Guide - Updated

   • Added audit logging section with property table
   • Configuration examples for production and development
   • Performance warnings

3. Example Properties File - Updated

   • Comprehensive audit logging section with comments
   • Example configurations for different use cases
   • Compliance-specific configurations (PCI-DSS, HIPAA, GDPR)

4. Documentation Index - Updated

   • Added audit logging guide to features section

The documentation covers configuration, usage, compliance requirements, performance impact, troubleshooting, and integration with monitoring tools.

[rrobetti]

Need to finish review of the code before merging, probably after release 0.4.0-beta.