70 lines
1.9 KiB
PHP
70 lines
1.9 KiB
PHP
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<?php
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namespace BookStack\Http\Middleware;
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use Closure;
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use Illuminate\Http\Request;
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use Illuminate\Support\Str;
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use Symfony\Component\HttpFoundation\Response;
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class ApplyCspRules
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{
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/**
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* Handle an incoming request.
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*
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* @param Request $request
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* @param Closure $next
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*
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* @return mixed
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*/
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public function handle($request, Closure $next)
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{
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$nonce = Str::random(24);
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view()->share('cspNonce', $nonce);
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// TODO - Assess whether image/style/iframe CSP rules should be set
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// TODO - Extract nonce application to custom head content in a way that's cacheable.
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// TODO - Fix remaining CSP issues and test lots
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$response = $next($request);
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$this->setFrameAncestors($response);
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$this->setScriptSrc($response, $nonce);
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return $response;
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}
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/**
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* Sets CSP 'script-src' headers to restrict the forms of script that can
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* run on the page.
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*/
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public function setScriptSrc(Response $response, string $nonce)
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{
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$parts = [
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'\'self\'',
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'\'nonce-' . $nonce . '\'',
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'\'strict-dynamic\'',
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];
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$response->headers->set('Content-Security-Policy', 'script-src ' . implode(' ', $parts));
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}
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/**
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* Sets CSP "frame-ancestors" headers to restrict the hosts that BookStack can be
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* iframed within. Also adjusts the cookie samesite options so that cookies will
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* operate in the third-party context.
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*/
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protected function setFrameAncestors(Response $response)
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{
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$iframeHosts = collect(explode(' ', config('app.iframe_hosts', '')))->filter();
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if ($iframeHosts->count() > 0) {
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config()->set('session.same_site', 'none');
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}
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$iframeHosts->prepend("'self'");
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$cspValue = 'frame-ancestors ' . $iframeHosts->join(' ');
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$response->headers->set('Content-Security-Policy', $cspValue);
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}
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}
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