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Set strict CSP policies when serving files from the attachment endpoints

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Jan Böhmer 2026-06-20 23:02:55 +02:00
parent 02726fdf69
commit 0cd83f0322
1 changed files with 12 additions and 0 deletions
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12
src/Controller/AttachmentFileController.php
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@ -93,6 +93,8 @@ class AttachmentFileController extends AbstractController
//Set header content disposition, so that the file will be downloaded
$response->setContentDisposition(ResponseHeaderBag::DISPOSITION_ATTACHMENT, $attachment->getFilename());
$this->setAttachmentCSPHeaders($response);
return $response;
}
@ -112,6 +114,16 @@ class AttachmentFileController extends AbstractController
//Set header content disposition, so that the file will be downloaded
$response->setContentDisposition(ResponseHeaderBag::DISPOSITION_INLINE, $attachment->getFilename());
$this->setAttachmentCSPHeaders($response);
return $response;
}
private function setAttachmentCSPHeaders(Response $response): Response
{
//Set an CSP that disallow to run any scripts, styles or images from the attachment render page, as it is not used anywhere else for now and can be a security risk if used without proper precautions, so it should be opt-in
$response->headers->set('Content-Security-Policy', "default-src 'none'; script-src 'none'; style-src 'self' 'unsafe-inline'; img-src 'self'; sandbox;");
return $response;
}