Mai/.planning/phases/02-safety-sandboxing/02-03-SUMMARY.md

02-03-SUMMARY: Tamper-Proof Audit Logging System

Execution Summary

Successfully implemented a comprehensive tamper-proof audit logging system with cryptographic integrity protection for Phase 02: Safety & Sandboxing.

Completed Tasks

Task 1: Tamper-Proof Audit Logger ✅

Files: src/audit/__init__.py, src/audit/crypto_logger.py

Implementation Details:

• Created TamperProofLogger class with SHA-256 hash chains for integrity protection
• Each log entry contains timestamp, event type, data, current hash, previous hash, and cryptographic signature
• Implemented hash chain continuity verification to detect any tampering
• Thread-safe implementation with proper file handling
• Methods: log_event(), verify_chain(), get_logs(), get_chain_info(), export_logs()

Key Features:

• SHA-256 cryptographic hashing for tamper detection
• Hash chain linking where each entry references the previous hash
• Digital signatures using HMAC with secret key (production-ready for proper asymmetric crypto)
• Comprehensive log entry structure with metadata support
• Built-in integrity verification that detects tampering attempts
• Export functionality with integrity verification included

Task 2: Audit Logging Interface ✅

File: src/audit/logger.py

Implementation Details:

• Created AuditLogger class providing high-level interface for security events
• Integrated with TamperProofLogger for automatic integrity protection
• Specialized methods for different security event types per CONTEXT.md requirements

Methods Implemented:

• log_code_execution() - Logs code execution with results, timing, security level
• log_security_assessment() - Logs Bandit/Semgrep assessment results
• log_container_creation() - Logs Docker container creation with security config
• log_resource_violation() - Logs resource limit violations and actions taken
• log_security_event() - General security event logging
• log_system_event() - System-level events (startup, shutdown, config changes)
• get_security_summary() - Security event analytics
• verify_integrity() - Integrity verification proxy
• export_audit_report() - Comprehensive audit report generation

Event Coverage:

• Code execution with timing and resource usage
• Security assessment findings and recommendations
• Container creation with security hardening details
• Resource violations with severity assessment
• General security events with contextual information

Task 3: Audit Configuration Policies ✅

File: config/audit.yaml

Configuration Sections:

• Retention Policies: 30-day default retention, compression, backup retention
• Logging Levels: comprehensive, basic, minimal with configurable detail levels
• Hash Chain Settings: SHA-256 enabled, integrity check intervals
• Storage Configuration: File rotation, size limits, directory structure
• Alerting Thresholds: Configurable alerts for critical events and violations
• Event-Specific Policies: Detailed settings for each event type
• Performance Optimization: Batch writing, memory management, async logging (future)
• Privacy & Security: Secret sanitization, encryption settings (future)
• Compliance Settings: Regulatory compliance frameworks (future)
• Integration Settings: Security assessor, sandbox, model interface integration
• Monitoring & Maintenance: Health checks, maintenance tasks, metrics

Verification Results

Functional Verification ✅

• TamperProofLogger: Successfully creates hash chain entries, maintains integrity
• SHA-256 Hashing: Correctly implemented with proper chaining
• Hash Chain Tampering Detection: Verification detects any modifications
• AuditLogger Integration: Seamlessly integrates with crypto logger
• All Security Event Types: Comprehensive coverage of security-relevant events
• Configuration Loading: Audit configuration loads and validates correctly

Import Verification ✅

# Successful imports
from src.audit.crypto_logger import TamperProofLogger
from src.audit.logger import AuditLogger

Runtime Verification ✅

# Test results
TamperProofLogger verification passed: True
Total entries: 2
AuditLogger created entries successfully  
Security summary entries: 1 1
All tests passed!

Security Architecture

Tamper Detection System

1. Hash Chain Construction: Each entry contains SHA-256 hash of current data + previous hash
2. Cryptographic Signatures: HMAC signatures protect hash integrity
3. Continuity Verification: Previous hash links ensure chain integrity
4. Comprehensive Validation: Detects data modification, chain breaks, and signature failures

Event Coverage

• Code Execution: Full execution context, results, timing, security assessment
• Security Assessment: Bandit/Semgrep findings, recommendations, severity scoring
• Container Management: Creation events, security hardening, resource limits
• Resource Monitoring: Violations, thresholds, actions taken, severity levels
• System Events: Startup, shutdown, configuration changes
• General Security: Custom security events with full context

Data Protection

• Immutable Logs: Once written, entries cannot be modified without detection
• Cryptographic Integrity: SHA-256 + HMAC signature protection
• Configurable Retention: 30-day default with compression and backup policies
• Privacy Controls: Secret sanitization patterns for sensitive data

Integration Points

Security Module Integration

• Ready to integrate with SecurityAssessor class for automatic assessment logging
• Configured to capture assessment findings, recommendations, and security levels

Sandbox Module Integration

• Prepared for ContainerManager integration for container creation logging
• Resource violation monitoring and alerting capabilities included

Model Interface Integration

• Foundation laid for future LLM inference call logging
• Conversation summary logging framework (configurable)

Configuration Completeness

The config/audit.yaml provides:

• 18 major configuration sections covering all aspects of audit logging
• Retention policies with 30-day default, compression, and backup
• Hash chain configuration with SHA-256 enabled and integrity checks
• Alerting thresholds for critical events and resource violations
• Event-specific policies for comprehensive security event handling
• Performance optimization settings for production use
• Future-ready sections for compliance, encryption, and async logging

Success Criteria Met ✅

1. Tamper-proof audit logging system operational - SHA-256 hash chains with detection working
2. Cryptographic integrity protection - Hash chaining + signatures implemented
3. Comprehensive event logging - All security event types covered
4. Configurable retention policies - 30-day default with full configuration

Technical Debt & Future Work

Immediate (Next Phase)

• Integrate with existing SecurityAssessor for automatic assessment logging
• Connect with ContainerManager for container event logging
• Add proper asymmetric cryptography for production signatures

Future Enhancements

• Asynchronous logging for better performance
• Log file encryption at rest
• Real-time alerting via webhooks/email
• Regulatory compliance features (GDPR, HIPAA, SOX)
• Log search and analytics interface

Files Modified

• New: src/audit/__init__.py - Module initialization and exports
• New: src/audit/crypto_logger.py - Tamper-proof logger with SHA-256 hash chains
• New: src/audit/logger.py - High-level audit logging interface
• New: config/audit.yaml - Comprehensive audit logging policies

Verification Status: ✅ COMPLETE

All tasks from 02-03-PLAN.md have been successfully implemented and verified. The tamper-proof audit logging system is ready for integration with the security and sandboxing modules in subsequent phases.

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Execution completed: 2026-01-27
All verification tests passed
Ready for Phase 02-04