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Security: tighten up the File tool against clowning around.
Summary: Test Plan: Reviewers: CC:
This commit is contained in:
parent
b462349ec8
commit
17a4069f01
5 changed files with 89 additions and 14 deletions
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@ -233,5 +233,25 @@ return array(
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// Version string displayed in the footer. You probably should leave this
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// alone.
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'phabricator.version' => 'UNSTABLE',
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// -- Files ----------------------------------------------------------------- //
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// Lists which uploaded file types may be viewed in the browser. If a file
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// has a mime type which does not appear in this list, it will always be
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// downloaded instead of displayed. This is a security consideration: if a
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// user uploads a file of type "text/html" and it is displayed as
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// "text/html", they can eaily execute XSS attacks. This is also a usability
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// consideration, since browsers tend to freak out when viewing enormous
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// binary files.
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//
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// The keys in this array are viewable mime types; the values are the mime
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// types they will be delivered as when they are viewed in the browser.
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'files.viewable-mime-types' => array(
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'image/jpeg' => 'image/jpeg',
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'image/jpg' => 'image/jpg',
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'image/png' => 'image/png',
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'text/plain' => 'text/plain; charset=utf-8',
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),
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);
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@ -26,6 +26,10 @@ class AphrontFileResponse extends AphrontResponse {
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private $download;
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public function setDownload($download) {
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$download = preg_replace('/[^A-Za-z0-9_.-]/', '_', $download);
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if (!strlen($download)) {
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$download = 'untitled_document.txt';
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}
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$this->download = $download;
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return $this;
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}
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@ -55,12 +59,20 @@ class AphrontFileResponse extends AphrontResponse {
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public function getHeaders() {
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$headers = array(
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array('Content-Type', $this->getMimeType()),
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// Without this, IE can decide that we surely meant "text/html" when
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// delivering another content type since, you know, it looks like it's
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// probably an HTML document. This closes the security hole that policy
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// creates.
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array('X-Content-Type-Options', 'nosniff'),
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);
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if ($this->getDownload()) {
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if (strlen($this->getDownload())) {
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$headers[] = array('X-Download-Options', 'noopen');
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$filename = $this->getDownload();
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$headers[] = array(
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'Content-Disposition',
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'attachment; filename='.$this->getDownload(),
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'attachment; filename='.$filename,
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);
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}
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@ -24,6 +24,17 @@ class PhabricatorFileListController extends PhabricatorFileController {
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$rows = array();
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foreach ($files as $file) {
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if ($file->isViewableInBrowser()) {
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$view_button = phutil_render_tag(
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'a',
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array(
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'class' => 'small button grey',
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'href' => '/file/view/'.$file->getPHID().'/',
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),
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'View');
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} else {
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$view_button = null;
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}
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$rows[] = array(
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phutil_escape_html($file->getPHID()),
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phutil_escape_html($file->getName()),
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@ -35,13 +46,7 @@ class PhabricatorFileListController extends PhabricatorFileController {
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'href' => '/file/info/'.$file->getPHID().'/',
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),
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'Info'),
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phutil_render_tag(
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'a',
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array(
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'class' => 'small button grey',
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'href' => '/file/view/'.$file->getPHID().'/',
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),
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'View'),
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$view_button,
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phutil_render_tag(
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'a',
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array(
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@ -34,15 +34,32 @@ class PhabricatorFileViewController extends PhabricatorFileController {
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if (!$file) {
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return new Aphront404Response();
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}
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switch ($this->view) {
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case 'download':
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case 'view':
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$data = $file->loadFileData();
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$response = new AphrontFileResponse();
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$response->setContent($data);
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$response->setMimeType($file->getMimeType());
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if ($this->view == 'download') {
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if ($this->view == 'view') {
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if (!$file->isViewableInBrowser()) {
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return new Aphront400Response();
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}
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$download = false;
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} else {
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$download = true;
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}
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if ($download) {
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$mime_type = $file->getMimeType();
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} else {
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$mime_type = $file->getViewableMimeType();
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}
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$response->setMimeType($mime_type);
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if ($download) {
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$response->setDownload($file->getName());
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}
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return $response;
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@ -51,7 +68,14 @@ class PhabricatorFileViewController extends PhabricatorFileController {
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}
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$form = new AphrontFormView();
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$form->setAction('/file/view/'.$file->getPHID().'/');
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if ($file->isViewableInBrowser()) {
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$form->setAction('/file/view/'.$file->getPHID().'/');
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$button_name = 'View File';
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} else {
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$form->setAction('/file/download/'.$file->getPHID().'/');
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$button_name = 'Download File';
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}
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$form->setUser($this->getRequest()->getUser());
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$form
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->appendChild(
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@ -96,7 +120,7 @@ class PhabricatorFileViewController extends PhabricatorFileController {
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->setValue($file->getStorageHandle()))
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->appendChild(
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id(new AphrontFormSubmitControl())
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->setValue('View File'));
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->setValue($button_name));
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$panel = new AphrontPanelView();
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$panel->setHeader('File Info - '.$file->getName());
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@ -174,5 +174,19 @@ class PhabricatorFile extends PhabricatorFileDAO {
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public function getViewURI() {
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return PhabricatorFileURI::getViewURIForPHID($this->getPHID());
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}
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public function isViewableInBrowser() {
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return ($this->getViewableMimeType() !== null);
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}
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public function getViewableMimeType() {
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$mime_map = PhabricatorEnv::getEnvConfig('files.viewable-mime-types');
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$mime_type = $this->getMimeType();
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$mime_parts = explode(';', $mime_type);
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$mime_type = reset($mime_parts);
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return idx($mime_map, $mime_type);
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}
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}
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