278 lines
13 KiB
Markdown
278 lines
13 KiB
Markdown
# Aegis — Architecture
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## High-Level Overview
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```
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┌────────────────────┐ ┌─────────────────────┐
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│ React Frontend │──────▶│ FastAPI Backend │
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│ (Vite / TS / TW) │ REST │ (Python 3.11) │
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└────────────────────┘ └──────┬──────┬────────┘
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│ │
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┌─────────┘ └─────────┐
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▼ ▼
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┌─────────────────┐ ┌─────────────────┐
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│ PostgreSQL │ │ MinIO │
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│ (Data Store) │ │ (Object Storage) │
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└─────────────────┘ └─────────────────┘
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```
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- **Frontend** — React 19 + TypeScript + Tailwind CSS v4 + TanStack Query
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- **Backend** — FastAPI with SQLAlchemy ORM + Alembic migrations
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- **Database** — PostgreSQL 15 with UUID primary keys and JSONB columns
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- **Object Storage** — MinIO (S3-compatible) for evidence files
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- **Scheduler** — APScheduler (in-process) for background jobs
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---
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## Database Schema
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### Core Tables
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| Table | Description |
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|-------|-------------|
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| `users` | User accounts with role-based access (admin, red_tech, blue_tech, red_lead, blue_lead, viewer) |
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| `techniques` | MITRE ATT&CK techniques with coverage status, tactic, platforms (JSONB) |
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| `tests` | Security tests with full Red/Blue workflow fields, dual validation, remediation, and retest chain |
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| `test_templates` | Predefined test catalog from Atomic Red Team, Sigma, CALDERA, LOLBAS, custom |
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| `evidences` | Evidence files separated by team (red/blue) with SHA256 integrity verification |
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### Detection & Defense
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| Table | Description |
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|-------|-------------|
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| `detection_rules` | Imported detection rules (Sigma, Elastic, custom) linked to ATT&CK techniques |
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| `test_detection_results` | Per-test detection rule evaluation results (triggered / not triggered) |
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| `test_template_detection_rules` | Template ↔ detection rule associations |
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| `defensive_techniques` | MITRE D3FEND defensive techniques |
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| `defensive_technique_mappings` | ATT&CK technique ↔ D3FEND defensive technique mappings |
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### Campaigns & Scheduling
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| Table | Description |
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|-------|-------------|
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| `campaigns` | Test campaign groupings with scheduling (recurring, weekly/monthly/quarterly) |
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| `campaign_tests` | Ordered test assignments within campaigns with dependency support |
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### Intelligence & Actors
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| Table | Description |
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|-------|-------------|
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| `threat_actors` | MITRE CTI intrusion sets with aliases, country, motivation, JSONB targets |
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| `threat_actor_techniques` | Threat actor ↔ ATT&CK technique mappings |
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| `intel_items` | Threat intelligence items from RSS feeds |
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### Compliance
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| Table | Description |
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|-------|-------------|
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| `compliance_frameworks` | Compliance frameworks (e.g., NIST 800-53) |
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| `compliance_controls` | Individual controls within a framework |
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| `compliance_control_mappings` | Control ↔ ATT&CK technique mappings |
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### Operational
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| Table | Description |
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|-------|-------------|
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| `coverage_snapshots` | Point-in-time coverage status captures with aggregate metrics |
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| `snapshot_technique_states` | Normalized per-technique state within a snapshot |
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| `audit_logs` | System-wide audit trail with JSONB details |
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| `notifications` | In-app notifications with read status |
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| `data_sources` | External data source configuration and sync status |
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### Key Relationships
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```
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Technique ──1:N── Test ──1:N── Evidence
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│ │
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│ ├── TestDetectionResult ──N:1── DetectionRule
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│ └── CampaignTest ──N:1── Campaign
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│
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├── ThreatActorTechnique ──N:1── ThreatActor
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├── DefensiveTechniqueMapping ──N:1── DefensiveTechnique
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├── ComplianceControlMapping ──N:1── ComplianceControl ──N:1── ComplianceFramework
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└── SnapshotTechniqueState ──N:1── CoverageSnapshot
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Test ──retest_of──▶ Test (self-referential retest chain)
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Campaign ──parent_campaign_id──▶ Campaign (recurring execution history)
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```
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---
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## Backend Architecture
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### Layered Structure
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```
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routers/ ← Thin HTTP adapters (auth, params, response shaping — zero inline ORM)
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↓
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services/ ← Framework-agnostic business logic (46 service modules, ~250 functions)
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↓
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domain/ ← Pure business rules (entities, value objects, ports, errors — zero framework imports)
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↓
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infrastructure/ ← Repository implementations (SQLAlchemy), Redis, mappers
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↓
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models/ ← SQLAlchemy ORM models (persistence mapping only)
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↓
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database.py ← Engine + session management (lazy initialization)
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```
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**Dependency rule:** routers → services → domain ← infrastructure. Dependencies always point inward toward domain.
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**Transaction management:** Services never call `db.commit()`. Routers manage transactions via `UnitOfWork`. Import services and background jobs are documented exceptions (self-contained batch operations).
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### Services
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#### Business Logic Services
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| Service | Responsibility |
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|---------|---------------|
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| `test_workflow_service` | Test state machine (draft → validated/rejected) with dual validation |
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| `test_crud_service` | Test CRUD, query logic, permission validation |
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| `scoring_service` | 0–100 scoring for techniques, tactics, actors, organization |
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| `scoring_config_service` | DB-persisted scoring weights with validation |
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| `score_cache` | In-memory TTL cache (5 min) for expensive score/metric calculations |
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| `operational_metrics_service` | MTTD, MTTR, detection efficacy, alert fidelity, coverage velocity |
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| `metrics_query_service` | Dashboard aggregation queries |
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| `advanced_metrics_service` | Coverage by tactic, never-tested, avg validation time, detection trends |
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| `analytics_service` | BI-ready flat datasets (coverage, tests, trends, operators) |
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| `snapshot_service` | Coverage snapshot CRUD, temporal comparison, cleanup |
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| `campaign_crud_service` | Campaign CRUD, lifecycle, scheduling |
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| `campaign_service` | Campaign progress tracking, circular dependency prevention |
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| `campaign_scheduler_service` | Recurring campaign execution (clone + schedule next run) |
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| `status_service` | Technique status recalculation from test results |
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| `coverage_report_service` | Coverage report generation and CSV export |
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| `compliance_service` | Compliance framework analysis and gap detection |
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| `detection_rule_service` | Detection rule queries, auto-association, evaluation |
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| `threat_actor_service` | Threat actor queries, coverage, gap analysis |
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| `evidence_service` | Evidence permission validation and queries |
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| `heatmap_service` | ATT&CK Navigator layer generation |
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| `test_template_service` | Test template CRUD, stats, bulk-activate, filtered queries |
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| `auth_service` | Credential validation, password management |
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| `user_service` | User CRUD, role validation, password hashing |
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| `audit_query_service` | Paginated audit log queries and distinct lookups |
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| `audit_service` | Immutable audit trail logging (write-only) |
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| `data_source_service` | Data source CRUD, sync dispatch, statistics |
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| `notification_service` | In-app notification CRUD, state-change alerts, role-based dispatch |
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| `technique_query_service` | Technique detail queries with test/D3FEND aggregation |
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| `d3fend_query_service` | D3FEND defensive technique listing and tactic queries |
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| `osint_enrichment_service` | OSINT item queries, enrichment, summary statistics |
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| `worklog_service` | Worklog CRUD, integrity verification |
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| `intel_service` | RSS-based threat intelligence scanning |
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#### Import Services (all satisfy `ImportService` protocol)
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| Service | Responsibility |
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|---------|---------------|
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| `mitre_sync_service` | MITRE ATT&CK sync via TAXII 2.0 / GitHub fallback |
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| `atomic_import_service` | Atomic Red Team template import from GitHub |
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| `sigma_import_service` | SigmaHQ detection rule import |
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| `elastic_import_service` | Elastic detection rule import (TOML) |
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| `caldera_import_service` | CALDERA ability import |
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| `lolbas_import_service` | LOLBAS/GTFOBins template import |
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| `d3fend_import_service` | MITRE D3FEND defensive technique import |
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| `threat_actor_import_service` | MITRE CTI threat actor import (STIX) |
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| `compliance_import_service` | NIST 800-53 ↔ ATT&CK mapping import |
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### Domain Layer
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```
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domain/
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├── entities/ # Rich domain entities with business logic
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│ ├── technique.py # TechniqueEntity with status recalculation
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│ ├── campaign.py # CampaignEntity with lifecycle state machine
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│ ├── compliance.py # ComplianceFrameworkEntity with coverage calculation
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│ └── threat_actor.py # ThreatActorEntity with coverage analysis
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├── value_objects/ # Immutable value types
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│ ├── mitre_id.py # MITRE ATT&CK ID validation
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│ └── scoring_weights.py # Scoring weights (sum=100, non-negative)
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├── ports/ # Interfaces (Protocol contracts)
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│ ├── repositories/ # TechniqueRepository, TestRepository
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│ └── import_service.py # ImportService protocol + IMPORT_REGISTRY
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├── errors.py # Domain exceptions (EntityNotFoundError, etc.)
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├── enums.py # TestState, TechniqueStatus, TestResult
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├── test_entity.py # TestEntity with state machine + domain events
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└── unit_of_work.py # UnitOfWork context manager
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```
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### Scheduled Jobs (APScheduler)
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| Job | Schedule | Description |
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|-----|----------|-------------|
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| MITRE Sync | Every 24h | Sync ATT&CK techniques from TAXII/GitHub |
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| Intel Scan | Every 7 days | Scan RSS feeds for threat intelligence |
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| Notification Cleanup | Every 24h | Remove old read notifications |
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| Weekly Snapshot | Sundays 00:00 | Create coverage snapshot + cleanup old ones |
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| Recurring Campaigns | Every 24h | Check and execute due recurring campaigns |
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---
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## Test Lifecycle (State Machine)
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```
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┌──────┐ ┌──────────────┐ ┌─────────────────┐ ┌───────────┐
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│ DRAFT│───▶│RED_EXECUTING │───▶│ BLUE_EVALUATING │───▶│ IN_REVIEW │
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└──────┘ └──────────────┘ └─────────────────┘ └─────┬─────┘
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│
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┌───────────────────┤
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▼ ▼
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┌──────────┐ ┌──────────┐
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│ REJECTED │ │VALIDATED │
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└────┬─────┘ └──────────┘
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│ │
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└──▶ Back to DRAFT ├──▶ Remediation
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└──▶ Auto Re-test
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```
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**Dual Validation in IN_REVIEW:**
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- Red Lead votes approve/reject
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- Blue Lead votes approve/reject
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- Both approve → VALIDATED
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- Either rejects → REJECTED
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- One votes, other pending → stays IN_REVIEW
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**Auto Re-testing:** When remediation is completed on a validated test, the system automatically creates a follow-up retest (up to `MAX_RETEST_COUNT` = 3).
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---
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## Frontend Architecture
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### Key Technologies
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- **React 19** with TypeScript
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- **Vite 7** for bundling
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- **Tailwind CSS v4** for styling
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- **TanStack Query** for server state management
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- **TanStack Virtual** for table virtualization
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- **React Router v7** for routing
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- **Recharts** for charts and visualizations
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- **Lucide React** for icons
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### Page Lazy Loading
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All pages except `LoginPage` and `DashboardPage` are lazy-loaded via `React.lazy()` with `<Suspense>` fallbacks for optimal initial bundle size.
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### Role-Based Navigation
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The sidebar dynamically filters navigation items based on the current user's role:
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| Section | Visible to |
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|---------|-----------|
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| Dashboard | All roles |
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| Executive Dashboard | admin, red_lead, blue_lead |
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| ATT&CK Matrix | All roles |
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| Tests (sub-menu) | All roles |
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| Campaigns | All roles |
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| Threat Actors | All roles |
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| Compliance | All roles |
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| Comparison | admin, red_lead, blue_lead |
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| Reports | All roles |
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| System (admin section) | admin only |
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### Performance Optimizations
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- **React.memo** on `HeatmapCell` (renders 3000+ times in full matrix)
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- **useMemo** / **useCallback** for expensive calculations in memoized components
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- **useDebounce** hook for search inputs (300ms delay)
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- **TanStack Virtual** for large table virtualization (test templates, detection rules, audit logs)
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- **Lazy loading** for all non-critical page bundles
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