97 lines
2.5 KiB
PHP
97 lines
2.5 KiB
PHP
<?php
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namespace BookStack\Util;
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use Illuminate\Support\Str;
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use Symfony\Component\HttpFoundation\Response;
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class CspService
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{
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/** @var string */
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protected $nonce;
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public function __construct(string $nonce = '')
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{
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$this->nonce = $nonce ?: Str::random(24);
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}
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/**
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* Get the nonce value for CSP.
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*/
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public function getNonce(): string
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{
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return $this->nonce;
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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 $response)
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{
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if (config('app.allow_content_scripts')) {
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return;
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}
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$parts = [
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'http:',
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'https:',
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'\'nonce-' . $this->nonce . '\'',
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'\'strict-dynamic\'',
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];
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$value = 'script-src ' . implode(' ', $parts);
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$response->headers->set('Content-Security-Policy', $value, false);
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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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public function setFrameAncestors(Response $response)
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{
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$iframeHosts = $this->getAllowedIframeHosts();
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array_unshift($iframeHosts, "'self'");
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$cspValue = 'frame-ancestors ' . implode(' ', $iframeHosts);
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$response->headers->set('Content-Security-Policy', $cspValue, false);
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}
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/**
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* Check if the user has configured some allowed iframe hosts.
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*/
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public function allowedIFrameHostsConfigured(): bool
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{
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return count($this->getAllowedIframeHosts()) > 0;
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}
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/**
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* Sets CSP 'object-src' headers to restrict the types of dynamic content
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* that can be embedded on the page.
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*/
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public function setObjectSrc(Response $response)
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{
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if (config('app.allow_content_scripts')) {
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return;
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}
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$response->headers->set('Content-Security-Policy', 'object-src \'self\'', false);
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}
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/**
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* Sets CSP 'base-uri' headers to restrict what base tags can be set on
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* the page to prevent manipulation of relative links.
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*/
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public function setBaseUri(Response $response)
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{
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$response->headers->set('Content-Security-Policy', 'base-uri \'self\'', false);
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}
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protected function getAllowedIframeHosts(): array
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{
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$hosts = config('app.iframe_hosts', '');
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return array_filter(explode(' ', $hosts));
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}
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}
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