Security Features Documentation¶

This document provides comprehensive information about the security features implemented in the FastAPI RBAC project.

🔒 Security Overview¶

The FastAPI RBAC system implements enterprise-grade security with multiple layers of protection against common web vulnerabilities and attacks.

Security Rating: ⭐⭐⭐⭐⭐ (Enterprise-Grade)

🛡️ Implemented Security Features¶

1. CSRF Protection¶

Implementation: fastapi-csrf-protect==1.0.3

Endpoint: GET /api/v1/auth/csrf-token
Protection: All state-changing operations (POST, PUT, DELETE)
Token Management: Secure cookie handling with signed/unsigned token support
Validation: 403 responses for invalid or missing CSRF tokens

Usage Example:

// Frontend CSRF token handling
const csrfToken = await csrfService.getCsrfToken();
// Token automatically included in subsequent requests

2. Input Sanitization¶

Implementation: Custom InputSanitizer class with bleach==6.2.0

XSS Prevention: HTML tag removal and content cleaning
Field-Type Sanitization: Text, email, HTML, URL, and search field sanitization
SQL Injection Protection: Parameter sanitization and validation
Path Traversal Protection: File path validation and cleaning
DoS Protection: Input length validation and rate limiting

Sanitization Types:

sanitize_text(): Basic text cleaning
sanitize_email(): Email format validation and cleaning
sanitize_html(): HTML content sanitization with allowed tags
sanitize_url(): URL validation and cleaning
sanitize_search(): Search query cleaning

3. Rate Limiting¶

Implementation: slowapi==0.1.9

Protected Endpoints:

Login: 5 attempts per minute
Registration: 3 attempts per hour
Password Reset: 3 attempts per hour
Token Refresh: 5 attempts per minute

Configuration:

# Rate limiter with user identification
limiter = Limiter(key_func=user_id_identifier)

# Applied to endpoints
@limiter.limit("5/minute")
async def login_endpoint():
    pass

4. Enhanced Security Headers¶

Implementation: Custom middleware and Nginx configuration

Headers Applied:

X-Content-Type-Options: nosniff
X-Frame-Options: DENY
X-XSS-Protection: 1; mode=block
Referrer-Policy: strict-origin-when-cross-origin
Permissions-Policy: geolocation=(), microphone=(), camera=()
Strict-Transport-Security: max-age=31536000; includeSubDomains
Content-Security-Policy: default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; ...

Protection Against:

Clickjacking (X-Frame-Options)
MIME sniffing (X-Content-Type-Options)
XSS attacks (CSP and X-XSS-Protection)
Information leakage (Referrer-Policy)

5. JWT Token Security¶

Implementation: PyJWT signing/verification plus Redis allowlist session invalidation (app/utils/token.py). See System Architecture and ADR 0001.

Features:

Access Tokens: Short-lived, stored in memory (Redux state)
Refresh Tokens: Long-lived, stored in localStorage
Token Allowlisting: Only tokens recorded at login/refresh are accepted
Automatic Refresh: Transparent token renewal
Secure Logout: Allowlist keys removed for the user/token type

Security Measures:

# Record token on allowlist at login/refresh (simplified)
await redis_client.set(f"user:{user_id}:{token_type}", token, ex=token_exp_time)

# Reject tokens missing from the allowlist
if not await redis_client.get(f"user:{user_id}:{token_type}"):
    raise HTTPException(status_code=401, detail="Token has been revoked")

6. Password Security¶

Implementation: Advanced password validation and history

Features:

Password Strength: Integration with zxcvbn for strength validation
Password History: Prevents reuse of last 5 passwords
Account Locking: 5 failed attempts trigger 15-minute lockout
Secure Hashing: bcrypt with salt for password storage

Password Policy:

Minimum 8 characters
Strength score validation
History tracking for compliance
Automatic lockout protection

7. Audit Logging¶

Implementation: Comprehensive security event logging

Logged Events:

Authentication attempts (success/failure)
Account lockouts and unlocks
Password changes
Permission changes
Administrative actions
Security violations

Log Format:

audit_log = AuditLog(
    actor_id=user_id,
    action="login_attempt",
    resource_type="user",
    resource_id=user_id,
    details={"ip_address": client_ip, "user_agent": user_agent},
    timestamp=datetime.utcnow()
)

🔍 Security Testing¶

Backend Security Tests¶

Files:

backend/test/test_csrf_implementation.py: CSRF protection validation
backend/test/test_sanitization.py: Input sanitization testing
Backend test suite includes security-focused test cases

Frontend Security Tests¶

Coverage: 17 CSRF-related tests in the frontend test suite

Test Areas:

CSRF token retrieval and storage
Token inclusion in requests
Error handling for invalid tokens
Token refresh mechanisms

🚨 Security Monitoring¶

Rate Limiting Monitoring¶

# Rate limit exceeded logging
logger.warning(f"Rate limit exceeded for {client_ip} on {endpoint}")

Security Event Monitoring¶

# Security violation logging
logger.error(f"Security violation: {violation_type} from {client_ip}")

Failed Authentication Monitoring¶

# Failed login attempt tracking
user.failed_attempts += 1
if user.failed_attempts >= 5:
    user.locked_until = datetime.utcnow() + timedelta(minutes=15)

🔧 Security Configuration¶

Environment Variables¶

# CSRF Protection
CSRF_SECRET_KEY=your-csrf-secret-key

# Rate Limiting
RATE_LIMIT_STORAGE_URL=redis://localhost:6379

# JWT Security
JWT_SECRET_KEY=your-jwt-secret-key
ACCESS_TOKEN_EXPIRE_MINUTES=30
REFRESH_TOKEN_EXPIRE_DAYS=7

# Password Security
PASSWORD_MIN_LENGTH=8
PASSWORD_HISTORY_COUNT=5
ACCOUNT_LOCKOUT_ATTEMPTS=5
ACCOUNT_LOCKOUT_DURATION=15

Docker Security¶

# Non-root user containers
USER 1000:1000

# Security options
security_opt:
  - no-new-privileges:true

# Read-only root filesystem
read_only: true

📋 Security Checklist¶

Pre-Deployment Security Validation¶

[ ] CSRF Protection: Verify all state-changing endpoints are protected
[ ] Input Sanitization: Test XSS prevention on all form inputs
[ ] Rate Limiting: Validate rate limits are working on auth endpoints
[ ] Security Headers: Confirm all security headers are present
[ ] JWT Security: Test token generation, validation, and allowlist invalidation
[ ] Password Security: Verify password policies and account locking
[ ] Audit Logging: Confirm security events are being logged
[ ] HTTPS: Ensure all communications are encrypted in production

Security Testing Commands¶

# Test CSRF protection
python backend/test/test_csrf_implementation.py

# Test input sanitization
python backend/test/test_sanitization.py

# Run security-focused backend tests
pytest test/ -k "security or auth or csrf" -v

# Run frontend security tests
cd react-frontend
npm test -- --run csrfService.test.ts

🔒 Production Security Recommendations¶

1. Infrastructure Security¶

Use HTTPS/TLS certificates
Configure firewall rules
Implement network segmentation
Regular security updates

2. Database Security¶

Use encrypted connections
Implement database user permissions
Regular backup encryption
Access logging

3. Monitoring & Alerting¶

Security event monitoring
Failed authentication alerting
Rate limiting breach notifications
Unusual activity detection

4. Regular Security Reviews¶

Monthly security audits
Dependency vulnerability scanning
Code security reviews
Penetration testing

📚 Additional Resources¶

Last Updated: June 11, 2025 Security Review: All features verified and operational Compliance: Enterprise-grade security standards met