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|
<?php
/**
*
* This file is part of the phpBB Forum Software package.
*
* @copyright (c) phpBB Limited <https://www.phpbb.com>
* @license GNU General Public License, version 2 (GPL-2.0)
*
* For full copyright and license information, please see
* the docs/CREDITS.txt file.
*
*/
/**
* @ignore
*/
if (!defined('IN_PHPBB'))
{
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_container;
$storage = $phpbb_container->get('storage.avatar');
$prefix = $config['avatar_salt'] . '_';
$file_path = $prefix . $file;
if ($storage->exists($file_path) && !headers_sent())
{
$file_info = $storage->file_info($file_path);
header('Cache-Control: public');
try
{
header('Content-Type: ' . $file_info->mimetype);
}
catch (\phpbb\storage\exception\exception $e)
{
// Just don't send this header
}
if ((strpos(strtolower($browser), 'msie') !== false) && !phpbb_is_greater_ie_version($browser, 7))
{
header('Content-Disposition: attachment; ' . header_filename($file));
if (strpos(strtolower($browser), 'msie 6.0') !== false)
{
header('Expires: ' . gmdate('D, d M Y H:i:s', time()) . ' GMT');
}
else
{
header('Expires: ' . gmdate('D, d M Y H:i:s', time() + 31536000) . ' GMT');
}
}
else
{
header('Content-Disposition: inline; ' . header_filename($file));
header('Expires: ' . gmdate('D, d M Y H:i:s', time() + 31536000) . ' GMT');
}
try
{
header('Content-Length: ' . $file_info->size);
}
catch (\phpbb\storage\exception\exception $e)
{
// Just don't send this header
}
try
{
$fp = $storage->read_stream($file_path);
$output = fopen('php://output', 'w+b');
stream_copy_to_stream($fp, $output);
fclose($fp);
fclose($output);
}
catch (\Exception $e)
{
// Send nothing
}
flush();
}
else
{
header('HTTP/1.0 404 Not Found');
}
}
/**
* Wraps an url into a simple html page. Used to display attachments in IE.
* this is a workaround for now; might be moved to template system later
* direct any complaints to 1 Microsoft Way, Redmond
*/
function wrap_img_in_html($src, $title)
{
echo '<!DOCTYPE html>';
echo '<html>';
echo '<head>';
echo '<meta charset="utf-8">';
echo '<meta http-equiv="X-UA-Compatible" content="IE=edge">';
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, $category)
{
global $user, $db, $phpbb_dispatcher, $request, $phpbb_container;
$storage = $phpbb_container->get('storage.attachment');
$filename = $attachment['physical_filename'];
if (!$storage->exists($filename))
{
send_status_line(404, 'Not Found');
trigger_error('ERROR_NO_ATTACHMENT');
}
// Correct the mime type - we force application/octetstream for all files, except images
// Please do not change this, it is a security precaution
if ($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
try
{
$file_info = $storage->file_info($filename);
$size = $file_info->size;
}
catch (\Exception $e)
{
$size = 0;
}
/**
* Event to alter attachment before it is sent to browser.
*
* @event core.send_file_to_browser_before
* @var array attachment Attachment data
* @var int category Attachment category
* @var string filename Path to file, including filename
* @var int size File size
* @since 3.1.11-RC1
*/
$vars = array(
'attachment',
'category',
'filename',
'size',
);
extract($phpbb_dispatcher->trigger_event('core.send_file_to_browser_before', compact($vars)));
// To correctly display further errors we need to make sure we are using the correct headers for both (unsetting content-length may not work)
// Check if headers already sent or not able to get the file contents.
if (headers_sent())
{
send_status_line(500, 'Internal Server Error');
trigger_error('UNABLE_TO_DELIVER_FILE');
}
// Make sure the database record for the filesize is correct
if ($size > 0 && $size != $attachment['filesize'] && strpos($attachment['physical_filename'], 'thumb_') === false)
{
// Update database record
$sql = 'UPDATE ' . ATTACHMENTS_TABLE . '
SET filesize = ' . (int) $size . '
WHERE attach_id = ' . (int) $attachment['attach_id'];
$db->sql_query($sql);
}
// Now the tricky part... let's dance
header('Cache-Control: private');
// 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: ' . $attachment['mimetype']);
if (phpbb_is_greater_ie_version($user->browser, 7))
{
header('X-Content-Type-Options: nosniff');
}
if (empty($user->browser) || ((strpos(strtolower($user->browser), 'msie') !== false) && !phpbb_is_greater_ie_version($user->browser, 7)))
{
header('Content-Disposition: attachment; ' . header_filename(htmlspecialchars_decode($attachment['real_filename'])));
if (empty($user->browser) || (strpos(strtolower($user->browser), 'msie 6.0') !== false))
{
header('Expires: ' . gmdate('D, d M Y H:i:s', time()) . ' GMT');
}
}
else
{
header('Content-Disposition: ' . ((strpos($attachment['mimetype'], 'image') === 0) ? 'inline' : 'attachment') . '; ' . header_filename(htmlspecialchars_decode($attachment['real_filename'])));
if (phpbb_is_greater_ie_version($user->browser, 7) && (strpos($attachment['mimetype'], 'image') !== 0))
{
header('X-Download-Options: noopen');
}
}
if (!set_modified_headers($attachment['filetime'], $user->browser))
{
if ($size)
{
header("Content-Length: $size");
}
// Try to deliver in chunks
@set_time_limit(0);
$fp = $storage->read_stream($filename);
// Close the db connection before sending the file etc.
file_gc(false);
if ($fp !== false)
{
$output = fopen('php://output', 'w+b');
stream_copy_to_stream($fp, $output);
fclose($fp);
}
flush();
}
exit;
}
/**
* Get a browser friendly UTF-8 encoded filename
*/
function header_filename($file)
{
global $request;
$user_agent = $request->header('User-Agent');
// There be dragons here.
// Not many follows the RFC...
if (strpos($user_agent, 'MSIE') !== 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, $request;
if (!$config['secure_downloads'])
{
return true;
}
$url = htmlspecialchars_decode($request->header('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 $allowed;
}
/**
* Check if the browser has the file already and set the appropriate headers-
* @returns false if a resend is in order.
*/
function set_modified_headers($stamp, $browser)
{
global $request;
// let's see if we have to send the file at all
$last_load = $request->header('If-Modified-Since') ? strtotime(trim($request->header('If-Modified-Since'))) : false;
if (strpos(strtolower($browser), 'msie 6.0') === false && !phpbb_is_greater_ie_version($browser, 7))
{
if ($last_load !== false && $last_load >= $stamp)
{
send_status_line(304, 'Not Modified');
// seems that we need those too ... browsers
header('Cache-Control: private');
header('Expires: ' . gmdate('D, d M Y H:i:s', time() + 31536000) . ' GMT');
return true;
}
else
{
header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $stamp) . ' GMT');
}
}
return false;
}
/**
* Garbage Collection
*
* @param bool $exit Whether to die or not.
*
* @return null
*/
function file_gc($exit = true)
{
global $cache, $db;
if (!empty($cache))
{
$cache->unload();
}
$db->sql_close();
if ($exit)
{
exit;
}
}
/**
* HTTP range support (RFC 2616 Section 14.35)
*
* Allows browsers to request partial file content
* in case a download has been interrupted.
*
* @param int $filesize the size of the file in bytes we are about to deliver
*
* @return mixed false if the whole file has to be delivered
* associative array on success
*/
function phpbb_http_byte_range($filesize)
{
// Only call find_range_request() once.
static $request_array;
if (!$filesize)
{
return false;
}
if (!isset($request_array))
{
$request_array = phpbb_find_range_request();
}
return (empty($request_array)) ? false : phpbb_parse_range_request($request_array, $filesize);
}
/**
* Searches for HTTP range request in request headers.
*
* @return mixed false if no request found
* array of strings containing the requested ranges otherwise
* e.g. array(0 => '0-0', 1 => '123-125')
*/
function phpbb_find_range_request()
{
global $request;
$value = $request->header('Range');
// Make sure range request starts with "bytes="
if (strpos($value, 'bytes=') === 0)
{
// Strip leading 'bytes='
// Multiple ranges can be separated by a comma
return explode(',', substr($value, 6));
}
return false;
}
/**
* Analyses a range request array.
*
* A range request can contain multiple ranges,
* we however only handle the first request and
* only support requests from a given byte to the end of the file.
*
* @param array $request_array array of strings containing the requested ranges
* @param int $filesize the full size of the file in bytes that has been requested
*
* @return mixed false if the whole file has to be delivered
* associative array on success
* byte_pos_start the first byte position, can be passed to fseek()
* byte_pos_end the last byte position
* bytes_requested the number of bytes requested
* bytes_total the full size of the file
*/
function phpbb_parse_range_request($request_array, $filesize)
{
$first_byte_pos = -1;
$last_byte_pos = -1;
// Go through all ranges
foreach ($request_array as $range_string)
{
$range = explode('-', trim($range_string));
// "-" is invalid, "0-0" however is valid and means the very first byte.
if (count($range) != 2 || $range[0] === '' && $range[1] === '')
{
continue;
}
// Substitute defaults
if ($range[0] === '')
{
$range[0] = 0;
}
if ($range[1] === '')
{
$range[1] = $filesize - 1;
}
if ($last_byte_pos >= 0 && $last_byte_pos + 1 != $range[0])
{
// We only support contiguous ranges, no multipart stuff :(
return false;
}
if ($range[1] && $range[1] < $range[0])
{
// The requested range contains 0 bytes.
continue;
}
// Return bytes from $range[0] to $range[1]
if ($first_byte_pos < 0)
{
$first_byte_pos = (int) $range[0];
}
$last_byte_pos = (int) $range[1];
if ($first_byte_pos >= $filesize)
{
// Requested range not satisfiable
return false;
}
// Adjust last-byte-pos if it is absent or greater than the content.
if ($range[1] === '' || $last_byte_pos >= $filesize)
{
$last_byte_pos = $filesize - 1;
}
}
if ($first_byte_pos < 0 || $last_byte_pos < 0)
{
return false;
}
return array(
'byte_pos_start' => $first_byte_pos,
'byte_pos_end' => $last_byte_pos,
'bytes_requested' => $last_byte_pos - $first_byte_pos + 1,
'bytes_total' => $filesize,
);
}
/**
* Increments the download count of all provided attachments
*
* @param \phpbb\db\driver\driver_interface $db The database object
* @param array|int $ids The attach_id of each attachment
*
* @return null
*/
function phpbb_increment_downloads($db, $ids)
{
if (!is_array($ids))
{
$ids = array($ids);
}
$sql = 'UPDATE ' . ATTACHMENTS_TABLE . '
SET download_count = download_count + 1
WHERE ' . $db->sql_in_set('attach_id', $ids);
$db->sql_query($sql);
}
/**
* Handles authentication when downloading attachments from a post or topic
*
* @param \phpbb\db\driver\driver_interface $db The database object
* @param \phpbb\auth\auth $auth The authentication object
* @param int $topic_id The id of the topic that we are downloading from
*
* @return null
*/
function phpbb_download_handle_forum_auth($db, $auth, $topic_id)
{
global $phpbb_container;
$sql_array = array(
'SELECT' => 't.topic_visibility, t.forum_id, f.forum_name, f.forum_password, f.parent_id',
'FROM' => array(
TOPICS_TABLE => 't',
FORUMS_TABLE => 'f',
),
'WHERE' => 't.topic_id = ' . (int) $topic_id . '
AND t.forum_id = f.forum_id',
);
$sql = $db->sql_build_query('SELECT', $sql_array);
$result = $db->sql_query($sql);
$row = $db->sql_fetchrow($result);
$db->sql_freeresult($result);
$phpbb_content_visibility = $phpbb_container->get('content.visibility');
if ($row && !$phpbb_content_visibility->is_visible('topic', $row['forum_id'], $row))
{
send_status_line(404, 'Not Found');
trigger_error('ERROR_NO_ATTACHMENT');
}
else if ($row && $auth->acl_get('u_download') && $auth->acl_get('f_download', $row['forum_id']))
{
if ($row['forum_password'])
{
// Do something else ... ?
login_forum_box($row);
}
}
else
{
send_status_line(403, 'Forbidden');
trigger_error('SORRY_AUTH_VIEW_ATTACH');
}
}
/**
* Handles authentication when downloading attachments from PMs
*
* @param \phpbb\db\driver\driver_interface $db The database object
* @param \phpbb\auth\auth $auth The authentication object
* @param int $user_id The user id
* @param int $msg_id The id of the PM that we are downloading from
*
* @return null
*/
function phpbb_download_handle_pm_auth($db, $auth, $user_id, $msg_id)
{
global $phpbb_dispatcher;
if (!$auth->acl_get('u_pm_download'))
{
send_status_line(403, 'Forbidden');
trigger_error('SORRY_AUTH_VIEW_ATTACH');
}
$allowed = phpbb_download_check_pm_auth($db, $user_id, $msg_id);
/**
* Event to modify PM attachments download auth
*
* @event core.modify_pm_attach_download_auth
* @var bool allowed Whether the user is allowed to download from that PM or not
* @var int msg_id The id of the PM to download from
* @var int user_id The user id for auth check
* @since 3.1.11-RC1
*/
$vars = array('allowed', 'msg_id', 'user_id');
extract($phpbb_dispatcher->trigger_event('core.modify_pm_attach_download_auth', compact($vars)));
if (!$allowed)
{
send_status_line(403, 'Forbidden');
trigger_error('ERROR_NO_ATTACHMENT');
}
}
/**
* Checks whether a user can download from a particular PM
*
* @param \phpbb\db\driver\driver_interface $db The database object
* @param int $user_id The user id
* @param int $msg_id The id of the PM that we are downloading from
*
* @return bool Whether the user is allowed to download from that PM or not
*/
function phpbb_download_check_pm_auth($db, $user_id, $msg_id)
{
// Check if the attachment is within the users scope...
$sql = 'SELECT msg_id
FROM ' . PRIVMSGS_TO_TABLE . '
WHERE msg_id = ' . (int) $msg_id . '
AND (
user_id = ' . (int) $user_id . '
OR author_id = ' . (int) $user_id . '
)';
$result = $db->sql_query_limit($sql, 1);
$allowed = (bool) $db->sql_fetchfield('msg_id');
$db->sql_freeresult($result);
return $allowed;
}
/**
* Check if the browser is internet explorer version 7+
*
* @param string $user_agent User agent HTTP header
* @param int $version IE version to check against
*
* @return bool true if internet explorer version is greater than $version
*/
function phpbb_is_greater_ie_version($user_agent, $version)
{
if (preg_match('/msie (\d+)/', strtolower($user_agent), $matches))
{
$ie_version = (int) $matches[1];
return ($ie_version > $version);
}
else
{
return false;
}
}
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