snipe-it/app/Http/Middleware/SecurityHeaders.php

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<?php
namespace App\Http\Middleware;
use Closure;
class SecurityHeaders
{
/**
* Handle an incoming request.
*
* @param \Illuminate\Http\Request $request
* @param \Closure $next
* @return mixed
*/
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// See https://securityheaders.com/
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private $unwantedHeaderList = [
'X-Powered-By',
'Server',
];
public function handle($request, Closure $next)
{
$this->removeUnwantedHeaders($this->unwantedHeaderList);
$response = $next($request);
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$response->headers->set('X-Content-Type-Options', 'nosniff');
$response->headers->set('X-XSS-Protection', '1; mode=block');
// Ugh. Feature-Policy is dumb and clumsy and mostly irrelevant for Snipe-IT,
// since we don't provide any way to IFRAME anything in in the first place.
// There is currently no easy way to default ALL THE THINGS to 'none', but
// security audits will still ding you if you don't have this header, even
// though we don't allow IFRAMING in the first place.
//
// So for security and compliance sake, here we are. Sigh.
//
// See also:
// - https://developers.google.com/web/updates/2018/06/feature-policy
// - https://scotthelme.co.uk/a-new-security-header-feature-policy/
// - https://github.com/w3c/webappsec-feature-policy/issues/189
$feature_policy[] = "accelerometer 'none'";
$feature_policy[] = "ambient-light-sensor 'none'";
$feature_policy[] = "animations 'none'";
$feature_policy[] = "autoplay 'none'";
$feature_policy[] = "battery 'none'";
$feature_policy[] = "camera 'none'";
$feature_policy[] = "display-capture 'none'";
$feature_policy[] = "document-domain 'none'";
$feature_policy[] = "encrypted-media 'none'";
$feature_policy[] = "fullscreen 'none'";
$feature_policy[] = "geolocation 'none'";
$feature_policy[] = "gyroscope 'none'";
$feature_policy[] = "legacy-image-formats 'none'";
$feature_policy[] = "magnetometer 'none'";
$feature_policy[] = "microphone 'none'";
$feature_policy[] = "midi 'none'";
$feature_policy[] = "oversized-images 'none'";
$feature_policy[] = "payment 'none'";
$feature_policy[] = "picture-in-picture 'none'";
$feature_policy[] = "publickey-credentials 'none'";
$feature_policy[] = "sync-xhr 'none'";
$feature_policy[] = "unsized-media 'none'";
$feature_policy[] = "usb 'none'";
$feature_policy[] = "vibrate 'none'";
$feature_policy[] = "wake-lock 'none'";
$feature_policy[] = "xr-spatial-tracking 'none'";
$feature_policy = implode(';', $feature_policy);
$response->headers->set('Feature-Policy', $feature_policy);
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// Defaults to same-origin if REFERRER_POLICY is not set in the .env
$response->headers->set('Referrer-Policy', config('app.referrer_policy'));
// The .env var ALLOW_IFRAMING defaults to false (which disallows IFRAMING)
// if not present, but some unique cases require this to be enabled.
// For example, some IT depts have IFRAMED Snipe-IT into their IT portal
// for convenience so while it is normally disallowed, there is
// an override that exists.
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if (config('app.allow_iframing') == false) {
$response->headers->set('X-Frame-Options', 'DENY');
}
// This defaults to false to maintain backwards compatibility for
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// people who are not running Snipe-IT over TLS (shame, shame, shame!)
// Seriously though, please run Snipe-IT over TLS. Let's Encrypt is free.
// https://letsencrypt.org
if (config('app.enable_hsts') === true) {
$response->headers->set('Strict-Transport-Security', 'max-age=31536000; includeSubDomains');
}
// We have to exclude debug mode here because debugbar pulls from a CDN or two
// and it will break things.
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if ((config('app.debug') != 'true') && (config('app.enable_csp') == 'true')) {
$csp_policy[] = "default-src 'self'";
$csp_policy[] = "style-src 'self' 'unsafe-inline'";
$csp_policy[] = "script-src 'self' 'unsafe-inline' 'unsafe-eval'";
$csp_policy[] = "connect-src 'self'";
$csp_policy[] = "object-src 'none'";
$csp_policy[] = "font-src 'self' data:";
$csp_policy[] = "img-src 'self' data: ".config('app.url').' '.env('PUBLIC_AWS_URL').' https://secure.gravatar.com http://gravatar.com maps.google.com maps.gstatic.com *.googleapis.com';
if (config('filesystems.disks.public.driver') == 's3') {
$csp_policy[] = "img-src 'self' data: ".config('filesystems.disks.public.url');
}
$csp_policy = join(';', $csp_policy);
$response->headers->set('Content-Security-Policy', $csp_policy);
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}
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return $response;
}
private function removeUnwantedHeaders($headerList)
{
foreach ($headerList as $header) {
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header_remove($header);
}
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}
}