111 lines
3.5 KiB
Markdown
111 lines
3.5 KiB
Markdown
# Security Hardening Summary
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## Critical Vulnerabilities Fixed
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### 1. ✅ Container Security
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**Issue**: Container running as root user
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**Fix**:
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- Created non-root user `appuser` in Dockerfile
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- Container now runs with limited privileges
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- Added `no-new-privileges:true` security option
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### 2. ✅ Host Header Injection
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**Issue**: Unvalidated `request.host` usage
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**Fix**:
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- Added whitelist of allowed hosts
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- Implemented `@validate_host` decorator
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- All routes now validate Host header before processing
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### 3. ✅ Input Sanitization
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**Issue**: Unvalidated domain input in templates
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**Fix**:
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- Added `sanitize_domain()` function with regex validation
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- Domain length and format validation
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- Prevents injection attacks via domain parameter
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### 4. ✅ Network Security
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**Issue**: Binding to all interfaces (0.0.0.0)
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**Fix**:
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- Application now binds to localhost only (127.0.0.1:8080)
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- External access through Traefik reverse proxy only
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- Updated all Traefik labels to use port 8080
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### 5. ✅ Security Headers
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**Issue**: Missing security headers
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**Fix**:
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- Added comprehensive security headers middleware
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- X-Content-Type-Options: nosniff
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- X-Frame-Options: DENY
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- X-XSS-Protection: 1; mode=block
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- Content-Security-Policy
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- Referrer-Policy
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### 6. ✅ Rate Limiting
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**Issue**: No rate limiting or request validation
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**Fix**:
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- Implemented rate limiting per IP address
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- Different limits for different endpoints:
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- Main page: 50 requests/hour
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- Health check: 10 requests/minute
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- Config endpoints: 20 requests/hour
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- Request size validation (512B-2KB depending on endpoint)
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### 7. ✅ Container Hardening
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**Issue**: Overprivileged container
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**Fix**:
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- Read-only filesystem with tmpfs for /tmp
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- Resource limits (256MB RAM, 0.5 CPU)
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- Security options preventing privilege escalation
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## Security Features Added
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### Input Validation
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- Host header validation against whitelist
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- Domain sanitization with regex patterns
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- Request size limits per endpoint
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- Content-Type validation
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### Rate Limiting
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- Per-IP rate limiting with sliding window
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- Configurable limits per endpoint type
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- Automatic cleanup of old request records
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### Network Security
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- Localhost-only binding
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- Reverse proxy required for external access
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- Updated health checks for new port
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### Container Security
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- Non-root user execution
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- Read-only filesystem
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- Resource constraints
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- No new privileges policy
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## Deployment Notes
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1. **Rebuild the Docker image** after these changes
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2. **Update docker-compose.yml** with the new configuration
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3. **Test all endpoints** to ensure functionality
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4. **Monitor logs** for any security-related errors
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5. **Consider adding Redis** for production rate limiting
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## Monitoring Recommendations
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- Monitor for 403 (Forbidden host) responses
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- Watch for 429 (Rate limit exceeded) responses
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- Log any invalid domain attempts
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- Monitor resource usage within limits
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## Security Audit (2025-02-01)
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A full security audit was performed; findings and remediations are documented in **SECURITY-AUDIT.md**. Critical and high-priority items have been addressed in code and deployment. **Important:** Ensure your reverse proxy (e.g. Traefik) overwrites `X-Forwarded-For` with the real client IP so rate limiting and logging use the correct client.
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## Additional Security Considerations
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For production deployment, consider:
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- Using Redis for distributed rate limiting
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- Implementing proper logging and monitoring
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- Adding WAF (Web Application Firewall) rules
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- Regular security audits and dependency updates
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- Implementing request signing for sensitive endpoints
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