Esta es la parte 2
// We allow admins having attachment permissions to see orphan attachments...
$own_attachment = ($auth->acl_get('a_attach') || $attachment['poster_id'] == $user->data['user_id']) ? true : false;
if (!$own_attachment || ($attachment['in_message'] && !$auth->acl_get('u_pm_download')) || (!$attachment['in_message'] && !$auth->acl_get('u_download')))
{
trigger_error('ERROR_NO_ATTACHMENT');
}
// Obtain all extensions...
$extensions = $cache->obtain_attach_extensions(true);
}
else
{
if (!$attachment['in_message'])
{
//
$sql = 'SELECT p.forum_id, f.forum_password, f.parent_id
FROM ' . POSTS_TABLE . ' p, ' . FORUMS_TABLE . ' f
WHERE p.post_id = ' . $attachment['post_msg_id'] . '
AND p.forum_id = f.forum_id';
$result = $db->sql_query_limit($sql, 1);
$row = $db->sql_fetchrow($result);
$db->sql_freeresult($result);
// Global announcement?
$f_download = (!$row) ? $auth->acl_getf_global('f_download') : $auth->acl_get('f_download', $row['forum_id']);
if ($auth->acl_get('u_download') && $f_download)
{
if ($row && $row['forum_password'])
{
// Do something else ... ?
login_forum_box($row);
}
}
else
{
trigger_error('SORRY_AUTH_VIEW_ATTACH');
}
}
else
{
$row['forum_id'] = false;
if (!$auth->acl_get('u_pm_download'))
{
header('HTTP/1.0 403 Forbidden');
trigger_error('SORRY_AUTH_VIEW_ATTACH');
}
// Check if the attachment is within the users scope...
$sql = 'SELECT user_id, author_id
FROM ' . PRIVMSGS_TO_TABLE . '
WHERE msg_id = ' . $attachment['post_msg_id'];
$result = $db->sql_query($sql);
$allowed = false;
while ($user_row = $db->sql_fetchrow($result))
{
if ($user->data['user_id'] == $user_row['user_id'] || $user->data['user_id'] == $user_row['author_id'])
{
$allowed = true;
break;
}
}
$db->sql_freeresult($result);
if (!$allowed)
{
header('HTTP/1.0 403 Forbidden');
trigger_error('ERROR_NO_ATTACHMENT');
}
}
// disallowed?
$extensions = array();
if (!extension_allowed($row['forum_id'], $attachment['extension'], $extensions))
{
trigger_error(sprintf($user->lang['EXTENSION_DISABLED_AFTER_POSTING'], $attachment['extension']));
}
}
if (!download_allowed())
{
header('HTTP/1.0 403 Forbidden');
trigger_error($user->lang['LINKAGE_FORBIDDEN']);
}
$download_mode = (int) $extensions[$attachment['extension']]['download_mode'];
// Fetching filename here to prevent sniffing of filename
$sql = 'SELECT attach_id, is_orphan, in_message, post_msg_id, extension, physical_filename, real_filename, mimetype
FROM ' . ATTACHMENTS_TABLE . "
WHERE attach_id = $download_id";
$result = $db->sql_query_limit($sql, 1);
$attachment = $db->sql_fetchrow($result);
$db->sql_freeresult($result);
if (!$attachment)
{
trigger_error('ERROR_NO_ATTACHMENT');
}
$attachment['physical_filename'] = basename($attachment['physical_filename']);
$display_cat = $extensions[$attachment['extension']]['display_cat'];
if (($display_cat == ATTACHMENT_CATEGORY_IMAGE || $display_cat == ATTACHMENT_CATEGORY_THUMB) && !$user->optionget('viewimg'))
{
$display_cat = ATTACHMENT_CATEGORY_NONE;
}
if ($display_cat == ATTACHMENT_CATEGORY_FLASH && !$user->optionget('viewflash'))
{
$display_cat = ATTACHMENT_CATEGORY_NONE;
}
if ($thumbnail)
{
$attachment['physical_filename'] = 'thumb_' . $attachment['physical_filename'];
}
else if (($display_cat == ATTACHMENT_CATEGORY_NONE || $display_cat == ATTACHMENT_CATEGORY_IMAGE) && !$attachment['is_orphan'])
{
// Update download count
$sql = 'UPDATE ' . ATTACHMENTS_TABLE . '
SET download_count = download_count + 1
WHERE attach_id = ' . $attachment['attach_id'];
$db->sql_query($sql);
}
if ($display_cat == ATTACHMENT_CATEGORY_IMAGE && $mode === 'view' && (strpos($attachment['mimetype'], 'image') === 0) && strpos(strtolower($user->browser), 'msie') !== false)
{
wrap_img_in_html(append_sid($phpbb_root_path . 'download/file.' . $phpEx, 'id=' . $attachment['attach_id']), $attachment['real_filename']);
}
else
{
// Determine the 'presenting'-method
if ($download_mode == PHYSICAL_LINK)
{
// This presenting method should no longer be used
if (!@is_dir($phpbb_root_path . $config['upload_path']))
{
trigger_error($user->lang['PHYSICAL_DOWNLOAD_NOT_POSSIBLE']);
}
redirect($phpbb_root_path . $config['upload_path'] . '/' . $attachment['physical_filename']);
exit;
}
else
{
send_file_to_browser($attachment, $config['upload_path'], $display_cat);
exit;
}
}
/**
* A simplified function to deliver avatars
* The argument needs to be checked before calling this function.
*/
function send_avatar_to_browser($file, $browser)
{
global $config, $phpbb_root_path;
$prefix = $config['avatar_salt'] . '_';
$image_dir = $config['avatar_path'];
// Adjust image_dir path (no trailing slash)
if (substr($image_dir, -1, 1) == '/' || substr($image_dir, -1, 1) == '\\')
{
$image_dir = substr($image_dir, 0, -1) . '/';
}
$image_dir = str_replace(array('../', '..\\', './', '.\\'), '', $image_dir);
if ($image_dir && ($image_dir[0] == '/' || $image_dir[0] == '\\'))
{
$image_dir = '';
}
$file_path = $phpbb_root_path . $image_dir . '/' . $prefix . $file;
if ((@file_exists($file_path) && @is_readable($file_path)) && !headers_sent())
{
header('Pragma: public');
$image_data = @getimagesize($file_path);
header('Content-Type: ' . image_type_to_mime_type($image_data[2]));
if (strpos(strtolower($browser), 'msie') !== false)
{
header('Content-Disposition: attachment; ' . header_filename($file));
if (strpos(strtolower($browser), 'msie 6.0') !== false)
{
header('Expires: -1');
}
else
{
header('Expires: ' . gmdate('D, d M Y H:i:s \G\M\T', time() + 31536000));
}
}
else
{
header('Content-Disposition: inline; ' . header_filename($file));
header('Expires: ' . gmdate('D, d M Y H:i:s \G\M\T', time() + 31536000));
}
$size = @filesize($file_path);
if ($size)
{
header("Content-Length: $size");
}
if (@readfile($file_path) === false)
{
$fp = @fopen($file_path, 'rb');
if ($fp !== false)
{
while (!feof($fp))
{
echo fread($fp, 8192);
}
fclose($fp);
}
}
flush();
}
else
{
header('HTTP/1.0 404 not found');
}
}
/**
* Wraps an url into a simple html page. Used to display attachments in IE.
* this is a workaround for now; might be moved to template system later
* direct any complaints to 1 Microsoft Way, Redmond
*/
function wrap_img_in_html($src, $title)
{
echo '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-Strict.dtd">';
echo '<html>';
echo '<head>';
echo '<meta http-equiv="content-type" content="text/html; charset=UTF-8" />';
echo '<title>' . $title . '</title>';
echo '</head>';
echo '<body>';
echo '<div>';
echo '<img src="' . $src . '" alt="' . $title . '" />';
echo '</div>';
echo '</body>';
echo '</html>';
}
/**
* Send file to browser
*/
function send_file_to_browser($attachment, $upload_dir, $category)
{
global $user, $db, $config, $phpbb_root_path;
$filename = $phpbb_root_path . $upload_dir . '/' . $attachment['physical_filename'];
if (!@file_exists($filename))
{
trigger_error($user->lang['ERROR_NO_ATTACHMENT'] . '<br /><br />' . sprintf($user->lang['FILE_NOT_FOUND_404'], $filename));
}
// Correct the mime type - we force application/octetstream for all files, except images
// Please do not change this, it is a security precaution
if ($category != ATTACHMENT_CATEGORY_IMAGE || strpos($attachment['mimetype'], 'image') !== 0)
{
$attachment['mimetype'] = (strpos(strtolower($user->browser), 'msie') !== false || strpos(strtolower($user->browser), 'opera') !== false) ? 'application/octetstream' : 'application/octet-stream';
}
if (@ob_get_length())
{
@ob_end_clean();
}
// Now send the File Contents to the Browser
$size = @filesize($filename);
// To correctly display further errors we need to make sure we are using the correct headers for both (unsetting content-length may not work)
// Check if headers already sent or not able to get the file contents.
if (headers_sent() || !@file_exists($filename) || !@is_readable($filename))
{
// PHP track_errors setting On?
if (!empty($php_errormsg))
{
trigger_error($user->lang['UNABLE_TO_DELIVER_FILE'] . '<br />' . sprintf($user->lang['TRACKED_PHP_ERROR'], $php_errormsg));
}
trigger_error('UNABLE_TO_DELIVER_FILE');
}
// Now the tricky part... let's dance
header('Pragma: public');
/**
* Commented out X-Sendfile support. To not expose the physical filename within the header if xsendfile is absent we need to look into methods of checking it's status.
*
* Try X-Sendfile since it is much more server friendly - only works if the path is *not* outside of the root path...
* lighttpd has core support for it. An apache2 module is available at http://celebnamer.celebworld.ws/stuff/mod_xsendfile/
*
* Not really ideal, but should work fine...
* <code>
* if (strpos($upload_dir, '/') !== 0 && strpos($upload_dir, '../') === false)
* {
* header('X-Sendfile: ' . $filename);
* }
* </code>
*/
// Send out the Headers. Do not set Content-Disposition to inline please, it is a security measure for users using the Internet Explorer.
header('Content-Type: ' . $attachment['mimetype']);
if (empty($user->browser) || (strpos(strtolower($user->browser), 'msie') !== false))
{
header('Content-Disposition: attachment; ' . header_filename(htmlspecialchars_decode($attachment['real_filename'])));
if (empty($user->browser) || (strpos(strtolower($user->browser), 'msie 6.0') !== false))
{
header('expires: -1');
}
}
else
{
header('Content-Disposition: ' . ((strpos($attachment['mimetype'], 'image') === 0) ? 'inline' : 'attachment') . '; ' . header_filename(htmlspecialchars_decode($attachment['real_filename'])));
}
if ($size)
{
header("Content-Length: $size");
}
// Try to deliver in chunks
@set_time_limit(0);
$fp = @fopen($filename, 'rb');
if ($fp !== false)
{
while (!feof($fp))
{
echo fread($fp, 8192);
}
fclose($fp);
}
else
{
@readfile($filename);
}
flush();
exit;
}
/**
* Get a browser friendly UTF-8 encoded filename
*/
function header_filename($file)
{
$user_agent = (!empty($_SERVER['HTTP_USER_AGENT'])) ? htmlspecialchars((string) $_SERVER['HTTP_USER_AGENT']) : '';
// There be dragons here.
// Not many follows the RFC...
if (strpos($user_agent, 'MSIE') !== false || strpos($user_agent, 'Safari') !== false || strpos($user_agent, 'Konqueror') !== false)
{
return "filename=" . rawurlencode($file);
}
// follow the RFC for extended filename for the rest
return "filename*=UTF-8''" . rawurlencode($file);
}
/**
* Check if downloading item is allowed
*/
function download_allowed()
{
global $config, $user, $db;
if (!$config['secure_downloads'])
{
return true;
}
$url = (!empty($_SERVER['HTTP_REFERER'])) ? trim($_SERVER['HTTP_REFERER']) : trim(getenv('HTTP_REFERER'));
if (!$url)
{
return ($config['secure_allow_empty_referer']) ? true : false;
}
// Split URL into domain and script part
$url = @parse_url($url);
if ($url === false)
{
return ($config['secure_allow_empty_referer']) ? true : false;
}
$hostname = $url['host'];
unset($url);
$allowed = ($config['secure_allow_deny']) ? false : true;
$iplist = array();
if (($ip_ary = @gethostbynamel($hostname)) !== false)
{
foreach ($ip_ary as $ip)
{
if ($ip)
{
$iplist[] = $ip;
}
}
}
// Check for own server...
$server_name = $user->host;
// Forcing server vars is the only way to specify/override the protocol
if ($config['force_server_vars'] || !$server_name)
{
$server_name = $config['server_name'];
}
if (preg_match('#^.*?' . preg_quote($server_name, '#') . '.*?$#i', $hostname))
{
$allowed = true;
}
// Get IP's and Hostnames
if (!$allowed)
{
$sql = 'SELECT site_ip, site_hostname, ip_exclude
FROM ' . SITELIST_TABLE;
$result = $db->sql_query($sql);
while ($row = $db->sql_fetchrow($result))
{
$site_ip = trim($row['site_ip']);
$site_hostname = trim($row['site_hostname']);
if ($site_ip)
{
foreach ($iplist as $ip)
{
if (preg_match('#^' . str_replace('\*', '.*?', preg_quote($site_ip, '#')) . '$#i', $ip))
{
if ($row['ip_exclude'])
{
$allowed = ($config['secure_allow_deny']) ? false : true;
break 2;
}
else
{
$allowed = ($config['secure_allow_deny']) ? true : false;
}
}
}
}
if ($site_hostname)
{
if (preg_match('#^' . str_replace('\*', '.*?', preg_quote($site_hostname, '#')) . '$#i', $hostname))
{
if ($row['ip_exclude'])
{
$allowed = ($config['secure_allow_deny']) ? false : true;
break;
}
else
{
$allowed = ($config['secure_allow_deny']) ? true : false;
}
}
}
}
$db->sql_freeresult($result);
}
return $allowed;
}
?>
