📋 MEDIUM: Implement Audit Logging System

[MorDev1]

Security Issue: Missing Audit Logging System

Priority: MEDIUM

CVE Impact: Medium - Forensic and Compliance Gaps
Security Risk: Inability to detect breaches, compliance violations, and security incidents

Problem Description

The current implementation lacks comprehensive audit logging:

1. No security event logging - Security-relevant events not tracked
2. No access logging - User actions not recorded
3. No compliance logging - Required audit trails missing
4. No forensic capabilities - Incident investigation impossible
5. No real-time monitoring - Security events not detected

Current Gaps

Missing Security Event Logging

• Authentication attempts (success/failure)
• Authorization failures
• Privilege escalation attempts
• SQL injection attempts
• Rate limiting violations
• Configuration changes

Missing Access Logging

• Tool invocations and parameters
• Database operations and queries
• User management operations
• File access operations
• Administrative actions

Missing Compliance Logging

• Data access and modifications
• User consent and permissions
• Data retention actions
• Privacy-related operations
• Regulatory compliance events

Required Implementation

1. Security Event Logging

• Log all authentication attempts
• Record authorization failures
• Track privilege escalation attempts
• Log SQL injection detection
• Record rate limiting violations
• Log configuration changes

2. Access Logging

• Log all tool invocations
• Record database operations
• Track user management actions
• Log file operations
• Record administrative actions
• Log sensitive data access

3. Audit Trail System

• Implement tamper-proof logging
• Add log integrity verification
• Implement log rotation and retention
• Add structured logging format
• Implement log aggregation

4. Real-time Monitoring

• Implement security event detection
• Add anomaly detection
• Implement alerting system
• Add dashboard and reporting
• Implement threat correlation

5. Compliance Logging

• Implement GDPR compliance logging
• Add SOC 2 audit trails
• Implement PCI DSS logging
• Add regulatory compliance support
• Implement data lineage tracking

Acceptance Criteria

• All security events are logged
• Access logs capture user actions
• Audit trails are tamper-proof
• Logs are structured and searchable
• Real-time monitoring is operational
• Compliance requirements are met
• Log retention policies are enforced
• Sensitive data is not logged

Testing Requirements

• Validate security event logging
• Test access log completeness
• Verify audit trail integrity
• Test real-time monitoring
• Validate compliance logging
• Test log retention and rotation
• Verify no sensitive data leakage

Implementation Steps

1. Phase 1: Implement basic security event logging
2. Phase 2: Add comprehensive access logging
3. Phase 3: Implement audit trail system
4. Phase 4: Add real-time monitoring
5. Phase 5: Implement compliance logging

Security Dependencies

• Requires authentication framework (🔐 CRITICAL: Implement Secure Authentication Framework #6) for user identification
• Supports overall security monitoring
• Enables incident response capabilities

Files to Modify

• src/index.ts - Request logging middleware
• src/client/index.ts - Database operation logging
• src/tools/\* - Tool-specific audit logging
• src/auth/\* - Authentication event logging
• New: src/audit/ - Audit logging modules
• New: src/monitoring/ - Real-time monitoring

Testing Commands

# Test audit logging system
npm run test:integration -- audit.test.ts

# Test security event logging
npm run test:security -- --grep "audit"

# Test compliance logging
npm run test:integration -- compliance.test.ts

Audit Event Schema

interface AuditEvent {
  timestamp: string;
  eventType: 'authentication'  < /dev/null |  'authorization' | 'access' | 'security' | 'compliance';
  severity: 'low' | 'medium' | 'high' | 'critical';
  userId?: string;
  sessionId?: string;
  toolName?: string;
  action: string;
  resource?: string;
  parameters?: Record<string, any>;
  result: 'success' | 'failure' | 'blocked';
  errorMessage?: string;
  ipAddress?: string;
  userAgent?: string;
  requestId: string;
  correlationId?: string;
}

Security Event Types

enum SecurityEventType {
  // Authentication events
  LOGIN_SUCCESS = 'auth.login.success',
  LOGIN_FAILURE = 'auth.login.failure',
  LOGOUT = 'auth.logout',
  
  // Authorization events
  AUTHORIZATION_SUCCESS = 'auth.authorization.success',
  AUTHORIZATION_FAILURE = 'auth.authorization.failure',
  PRIVILEGE_ESCALATION = 'auth.privilege.escalation',
  
  // Security events
  SQL_INJECTION_DETECTED = 'security.sql_injection.detected',
  XSS_ATTEMPT = 'security.xss.attempt',
  RATE_LIMIT_EXCEEDED = 'security.rate_limit.exceeded',
  COMMAND_INJECTION = 'security.command_injection.detected',
  
  // Access events
  TOOL_INVOCATION = 'access.tool.invocation',
  DATABASE_QUERY = 'access.database.query',
  USER_MANAGEMENT = 'access.user.management',
  FILE_ACCESS = 'access.file.access',
  
  // Compliance events
  DATA_ACCESS = 'compliance.data.access',
  DATA_MODIFICATION = 'compliance.data.modification',
  SENSITIVE_DATA_ACCESS = 'compliance.sensitive.access'
}

Implementation Examples

Security Event Logging

class AuditLogger {
  async logSecurityEvent(event: Partial<AuditEvent>) {
    const auditEvent: AuditEvent = {
      timestamp: new Date().toISOString(),
      requestId: generateRequestId(),
      ...event
    };
    
    // Store in secure audit database
    await this.storeAuditEvent(auditEvent);
    
    // Send to monitoring system
    await this.sendToMonitoring(auditEvent);
    
    // Alert if critical
    if (event.severity === 'critical') {
      await this.sendAlert(auditEvent);
    }
  }
}

Tool Invocation Logging

async function logToolInvocation(toolName: string, parameters: any, result: any) {
  await auditLogger.logSecurityEvent({
    eventType: 'access',
    severity: 'medium',
    action: 'tool_invocation',
    toolName,
    parameters: sanitizeParameters(parameters),
    result: result.error ? 'failure' : 'success',
    errorMessage: result.error?.message
  });
}

Log Storage and Retention

• Storage: Secure, tamper-proof database
• Retention: 1 year for security events, 90 days for access logs
• Encryption: All logs encrypted at rest
• Access Control: Restricted to authorized personnel only
• Backup: Regular backups with integrity verification

Monitoring and Alerting

• Real-time alerts for critical security events
• Anomaly detection for unusual patterns
• Dashboard for security metrics
• Reports for compliance and auditing
• Integration with SIEM systems

Compliance Support

• GDPR: Data processing and consent logging
• SOC 2: Security control logging
• PCI DSS: Payment data access logging
• HIPAA: Healthcare data access logging
• ISO 27001: Security management logging

References

• OWASP Logging Cheat Sheet
• NIST Cybersecurity Framework
• SANS Audit Log Management

Severity Justification

This is marked as MEDIUM because:

• Audit logging is essential for security monitoring
• Required for compliance and regulatory requirements
• Enables incident response and forensic analysis
• Supports continuous security improvement
• Not immediately critical but important for long-term security