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🛡️ Sentinel: Add standard security headers #50

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🛡️ Sentinel: Add standard security headers #50

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13 changes: 13 additions & 0 deletions package-lock.json
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18 changes: 18 additions & 0 deletions src/http-transport.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -106,6 +106,24 @@ export class HttpTransport {
next();
});

// Security: Add standard security headers
this.app.use((req: Request, res: Response, next: NextFunction) => {
// Prevent clickjacking
res.setHeader('X-Frame-Options', 'DENY');
// Prevent MIME sniffing
res.setHeader('X-Content-Type-Options', 'nosniff');
// Basic CSP
res.setHeader('Content-Security-Policy', "default-src 'self'");

// HSTS (skip for localhost)
const isLocal = req.hostname === 'localhost' || req.hostname === '127.0.0.1';
if (!isLocal) {
res.setHeader('Strict-Transport-Security', 'max-age=31536000; includeSubDomains');
}

next();
});

// DNS rebinding protection when binding to localhost
// Deny requests with mismatched Host headers to prevent DNS rebinding attacks
// Applies when server host is localhost/127.0.0.1, regardless of auth configuration
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