security-headers-configuration
Configures HTTP security headers to protect against XSS, clickjacking, and MIME sniffing attacks. Use when hardening web applications, passing security audits, or implementing Content Security Policy.
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Security scan
Scan passedNo risky patterns were found in the scanned files.
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SKILL.md
Security Headers Configuration
Implement HTTP security headers to defend against common browser-based attacks.
Essential Headers
| Header | Purpose | Value |
|---|---|---|
| HSTS | Force HTTPS | max-age=31536000; includeSubDomains |
| CSP | Restrict resources | default-src 'self' |
| X-Frame-Options | Prevent clickjacking | DENY |
| X-Content-Type-Options | Prevent MIME sniffing | nosniff |
Express Implementation
const helmet = require('helmet');
app.use(helmet());
// Custom CSP
app.use(helmet.contentSecurityPolicy({
directives: {
defaultSrc: ["'self'"],
scriptSrc: ["'self'", "'unsafe-inline'"],
styleSrc: ["'self'", "'unsafe-inline'"],
imgSrc: ["'self'", "data:", "https:"],
connectSrc: ["'self'", "https://api.example.com"],
fontSrc: ["'self'", "https://fonts.gstatic.com"],
frameAncestors: ["'none'"]
}
}));
Nginx Configuration
add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;
add_header X-Frame-Options "DENY" always;
add_header X-Content-Type-Options "nosniff" always;
add_header X-XSS-Protection "1; mode=block" always;
add_header Referrer-Policy "strict-origin-when-cross-origin" always;
add_header Permissions-Policy "geolocation=(), microphone=(), camera=()" always;
add_header Content-Security-Policy "default-src 'self'; script-src 'self'" always;
Verification Tools
Security Headers Checklist
- HSTS enabled with long max-age
- CSP configured and tested
- X-Frame-Options set to DENY
- X-Content-Type-Options set to nosniff
- Referrer-Policy configured
- Permissions-Policy disables unused features
Additional Implementations
See references/python-apache.md for:
- Python Flask security headers middleware
- Flask-Talisman library configuration
- Apache .htaccess configuration
- Header testing script
Common Mistakes
- Setting CSP to report-only permanently
- Using overly permissive policies
- Forgetting to test after changes
- Not including all subdomains in HSTS
Files
2- SKILL.md
f6d77e2e992.5 KB - references/python-apache.md
c0623c148a5.8 KB
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