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<?php defined("SYSPATH") or die("No direct script access.");
/**
* Gallery - a web based photo album viewer and editor
* Copyright (C) 2000-2008 Bharat Mediratta
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
*/
/**
* Proxy access to files in var/albums and var/resizes, making sure that the session user has
* access to view these files.
*
* Security Philosophy: we do not use the information provided to find if the file exists on
* disk. We use this information only to locate the correct item in the database and then we
* *only* use information from the database to find and proxy the correct file. This way all user
* input is sanitized against the database before we perform any file I/O.
*/
class File_Proxy_Controller extends Controller {
public function __call($function, $args) {
// request_uri: http://example.com/gallery3/var/trunk/albums/foo/bar.jpg
$request_uri = $this->input->server("REQUEST_URI");
// var_uri: http://example.com/gallery3/var/
$var_uri = url::file("var/");
// Make sure that the request is for a file inside var
$offset = strpos($request_uri, $var_uri);
if ($offset === false) {
kohana::show_404();
}
$file = substr($request_uri, strlen($var_uri));
// Make sure that we don't leave the var dir
if (strpos($file, "..") !== false) {
kohana::show_404();
}
// We only handle var/resizes and var/albums
$paths = explode("/", $file);
$type = $paths[0];
if ($type != "resizes" && $type != "albums" && $type != "thumbs") {
kohana::show_404();
}
// If the last element is .album.jpg, pop that off since it's not a real item
if ($paths[count($paths)-1] == ".album.jpg") {
array_pop($paths);
}
if ($paths[count($paths)-1] == "") {
array_pop($paths);
}
// Find all items that match the level and name, then iterate over those to find a match.
// In most cases we'll get it in one. Note that for the level calculation, we just count the
// size of $paths. $paths includes the type ("thumbs", etc) but it doesn't include the root,
// so it's a wash.
$count = count($paths);
$compare_file = VARPATH . $file;
$item = null;
foreach (ORM::factory("item")
->where("name", $paths[$count - 1])
->where("level", $count)
->find_all() as $match) {
if ($type == "albums") {
$match_file = $match->file_path();
} else if ($type == "resizes") {
$match_file = $match->resize_path();
} else {
$match_file = $match->thumb_path();
}
if ($match_file == $compare_file) {
$item = $match;
break;
}
}
if (!$item) {
kohana::show_404();
}
// Make sure we have access to the item
if (!access::can("view", $item)) {
kohana::show_404();
}
// Make sure we have view_full access to the original
if ($type == "albums" && !access::can("view_full", $item)) {
kohana::show_404();
}
// Don't try to load a directory
if ($type == "albums" && $item->is_album()) {
kohana::show_404();
}
if (!file_exists($match_file)) {
kohana::show_404();
}
// Dump out the image
header("Content-Type: $item->mime_type");
Kohana::close_buffers(false);
$fd = fopen($match_file, "rb");
fpassthru($fd);
fclose($fd);
}
}
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