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. HTTP Rate Limiting¶

Implementation: slowapi (sole HTTP rate limit library; see ADR 0008)

Protected Endpoints (HTTP rate limits, IP key):

Login: 5 attempts per minute
Registration: 3 attempts per hour
Password Reset request: 3 attempts per hour
Access token: 5 attempts per minute

Configuration: shared Limiter in app/core/rate_limit.py (get_remote_address; Redis storage_uri outside testing).

Registration / resend-verification also use separate Redis abuse counters (not slowapi).

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, HttpOnly Secure cookies (see ADR 0006)
Token Allowlisting: Only tokens recorded at login/refresh are accepted
Automatic Refresh: Transparent token renewal via cookie + CSRF
Secure Logout: Allowlist keys removed and refresh cookie cleared
Origin-Network Anomaly Detection: when VALIDATE_TOKEN_IP is on, the address a session was established from is recorded with its refresh allowlist entry. A refresh presented from a different IPv4 /24 or IPv6 /64 revokes that one session and answers with the ordinary refresh failure. Access tokens are never checked this way, the user's other sessions survive, and a session with no recorded origin refreshes normally. This is detection, not IP binding -- see ADR 0011 decision 5

Security Measures:

# Record tokens on the allowlist at login (simplified)
await add_session_tokens_to_redis(
    redis_client, user, access_token, refresh_token,
    access_expire_minutes=..., refresh_expire_minutes=...,
)

# Reject tokens missing from the live allowlist
valid = await get_valid_tokens(redis_client, user.id, TokenType.ACCESS)
if not token_is_allowlisted(valid, access_token):
    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 12 characters (PASSWORD_MIN_LENGTH), maximum 128
Upper case, lower case, digit and special character required
Rejects common passwords, sequential runs (abc, 123) and repeated runs
Strength score validation
History tracking for compliance
Automatic lockout protection

The thresholds above are settings, not constants in code. Every path that sets a password -- registration, password reset, reset confirm, change password, and admin create or update of a single user -- applies them through a single enforce_password_complexity call, so none of them can drift into a looser rule of its own. Bulk user update refuses a password key rather than applying one password to many accounts.

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