<?php
declare(strict_types=1);
use Airship\Engine\{
AutoPilot,
State
};
use ParagonIE\CSPBuilder\CSPBuilder;
use ParagonIE\HPKPBuilder\HPKPBuilder;
/**
* Security enhancements (i.e. CSP, HPKP) are defined here.
*
* @global State $state
*/
/**
* First, Content-Security-Policy headers:
*/
$cspCacheFile = ROOT . '/tmp/cache/csp.' . AutoPilot::$active_cabin . '.json';
if (\file_exists($cspCacheFile) && \filesize($cspCacheFile) > 0) {
$csp = CSPBuilder::fromFile($cspCacheFile);
} else {
$cspfile = ROOT . '/config/Cabin/' . AutoPilot::$active_cabin . '/content_security_policy.json';
if (\file_exists($cspfile)) {
$cabinPolicy = \Airship\loadJSON($cspfile);
// Merge the cabin-specific policy with the base policy
if (!empty($cabinPolicy['inherit'])) {
$basePolicy = \Airship\loadJSON(
ROOT . '/config/content_security_policy.json'
);
$cabinPolicy = \Airship\csp_merge(
$cabinPolicy,
$basePolicy
);
}
\Airship\saveJSON(
$cspCacheFile,
$cabinPolicy
);
$csp = CSPBuilder::fromFile($cspCacheFile);
} else {
// No cabin policy, use the default
$csp = CSPBuilder::fromFile(ROOT . '/config/content_security_policy.json');
}
}
$state->CSP = $csp;
/**
* Next, if we're connected over HTTPS, send an HPKP header too:
*/
if (AutoPilot::isHTTPSConnection()) {
$hpkpCacheFile = ROOT . '/tmp/cache/hpkp.' . AutoPilot::$active_cabin . '.json';
if (\file_exists($hpkpCacheFile) && \filesize($hpkpCacheFile) > 0) {
$hpkp = HPKPBuilder::fromFile($hpkpCacheFile);
$state->HPKP = $hpkp;
} else {
$hpkpConfig = $state->cabins[AutoPilot::$cabinIndex]['hpkp'];
if ($hpkpConfig['enabled'] && \count($hpkpConfig['hashes']) > 1) {
$hpkp = (new HPKPBuilder())
->includeSubdomains($hpkpConfig['include-subdomains'])
->maxAge($hpkpConfig['max-age'])
->reportOnly($hpkpConfig['report-only'])
->reportUri($hpkpConfig['report-uri']);
foreach ($hpkpConfig['hashes'] as $h) {
$hpkp->addHash(
$h['hash'],
(string) ($h['algo'] ?? 'sha256')
);
}
\file_put_contents(
$hpkpCacheFile,
$hpkp->getJSON()
);
$state->HPKP = $hpkp;
} else {
$state->HPKP = null;
}
}
}
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