private static function do_self_healing()
{
$flag_security_alert = self::heal_wp_upload_dir();
$gf_upload_root = GFFormsModel::get_upload_root();
if (!is_dir($gf_upload_root)) {
return;
}
$flag_security_alert = self::rename_suspicious_files_recursive($gf_upload_root, $flag_security_alert);
if ($flag_security_alert) {
update_option('gform_security_alert', $flag_security_alert);
}
}
/**
* Self-heals suspicious files
*
* @access private
* @static
* @see GFForms::heal_wp_upload_dir
* @see GFForms::rename_suspicious_files_recursive
*/
private static function do_self_healing()
{
GFCommon::log_debug(__METHOD__ . '(): Start self healing');
self::heal_wp_upload_dir();
$gf_upload_root = GFFormsModel::get_upload_root();
if (!is_dir($gf_upload_root) || is_link($gf_upload_root)) {
return;
}
self::rename_suspicious_files_recursive($gf_upload_root);
}
public static function upload()
{
GFCommon::log_debug('GFAsyncUpload::upload(): Starting.');
if ($_SERVER['REQUEST_METHOD'] != 'POST') {
status_header(404);
die;
}
header('Content-Type: text/html; charset=' . get_option('blog_charset'));
send_nosniff_header();
nocache_headers();
status_header(200);
// If the file is bigger than the server can accept then the form_id might not arrive.
// This might happen if the file is bigger than the max post size ini setting.
// Validation in the browser reduces the risk of this happening.
if (!isset($_REQUEST['form_id'])) {
GFCommon::log_debug('GFAsyncUpload::upload(): File upload aborted because the form_id was not found. The file may have been bigger than the max post size ini setting.');
self::die_error(500, __('Failed to upload file.', 'gravityforms'));
}
$form_id = absint($_REQUEST['form_id']);
$form_unique_id = rgpost('gform_unique_id');
$form = GFAPI::get_form($form_id);
if (empty($form) || !$form['is_active']) {
die;
}
if (rgar($form, 'requireLogin')) {
if (!is_user_logged_in()) {
die;
}
check_admin_referer('gform_file_upload_' . $form_id, '_gform_file_upload_nonce_' . $form_id);
}
if (!ctype_alnum($form_unique_id)) {
die;
}
$target_dir = GFFormsModel::get_upload_path($form_id) . DIRECTORY_SEPARATOR . 'tmp' . DIRECTORY_SEPARATOR;
if (!is_dir($target_dir)) {
if (!wp_mkdir_p($target_dir)) {
GFCommon::log_debug("GFAsyncUpload::upload(): Couldn't create the tmp folder: " . $target_dir);
self::die_error(500, __('Failed to upload file.', 'gravityforms'));
}
}
$time = current_time('mysql');
$y = substr($time, 0, 4);
$m = substr($time, 5, 2);
//adding index.html files to all subfolders
if (!file_exists(GFFormsModel::get_upload_root() . '/index.html')) {
GFForms::add_security_files();
} else {
if (!file_exists(GFFormsModel::get_upload_path($form_id) . '/index.html')) {
GFCommon::recursive_add_index_file(GFFormsModel::get_upload_path($form_id));
} else {
if (!file_exists(GFFormsModel::get_upload_path($form_id) . "/{$y}/index.html")) {
GFCommon::recursive_add_index_file(GFFormsModel::get_upload_path($form_id) . "/{$y}");
} else {
GFCommon::recursive_add_index_file(GFFormsModel::get_upload_path($form_id) . "/{$y}/{$m}");
}
}
}
if (!file_exists($target_dir . '/index.html')) {
GFCommon::recursive_add_index_file($target_dir);
}
$uploaded_filename = $_FILES['file']['name'];
$file_name = isset($_REQUEST['name']) ? $_REQUEST['name'] : '';
$field_id = rgpost('field_id');
$field_id = absint($field_id);
$field = GFFormsModel::get_field($form, $field_id);
if (empty($field) || GFFormsModel::get_input_type($field) != 'fileupload') {
die;
}
$file_name = sanitize_file_name($file_name);
$uploaded_filename = sanitize_file_name($uploaded_filename);
$allowed_extensions = !empty($field->allowedExtensions) ? GFCommon::clean_extensions(explode(',', strtolower($field->allowedExtensions))) : array();
$max_upload_size_in_bytes = $field->maxFileSize > 0 ? $field->maxFileSize * 1048576 : wp_max_upload_size();
$max_upload_size_in_mb = $max_upload_size_in_bytes / 1048576;
if ($_FILES['file']['size'] > 0 && $_FILES['file']['size'] > $max_upload_size_in_bytes) {
self::die_error(104, sprintf(__('File exceeds size limit. Maximum file size: %dMB', 'gravityforms'), $max_upload_size_in_mb));
}
if (GFCommon::file_name_has_disallowed_extension($file_name) || GFCommon::file_name_has_disallowed_extension($uploaded_filename)) {
GFCommon::log_debug("GFAsyncUpload::upload(): Illegal file extension: {$file_name}");
self::die_error(104, __('The uploaded file type is not allowed.', 'gravityforms'));
}
if (!empty($allowed_extensions)) {
if (!GFCommon::match_file_extension($file_name, $allowed_extensions) || !GFCommon::match_file_extension($uploaded_filename, $allowed_extensions)) {
GFCommon::log_debug("GFAsyncUpload::upload(): The uploaded file type is not allowed: {$file_name}");
self::die_error(104, sprintf(__('The uploaded file type is not allowed. Must be one of the following: %s', 'gravityforms'), strtolower($field['allowedExtensions'])));
}
}
$whitelisting_disabled = apply_filters('gform_file_upload_whitelisting_disabled', false);
if (empty($allowed_extensions) && !$whitelisting_disabled) {
// Whitelist the file type
$valid_uploaded_filename = GFCommon::check_type_and_ext($_FILES['file'], $uploaded_filename);
if (is_wp_error($valid_uploaded_filename)) {
self::die_error($valid_uploaded_filename->get_error_code(), $valid_uploaded_filename->get_error_message());
}
$valid_file_name = GFCommon::check_type_and_ext($_FILES['file'], $file_name);
if (is_wp_error($valid_uploaded_filename)) {
self::die_error($valid_file_name->get_error_code(), $valid_file_name->get_error_message());
}
}
$tmp_file_name = $form_unique_id . '_input_' . $field_id . '_' . $file_name;
$tmp_file_name = sanitize_file_name($tmp_file_name);
$file_path = $target_dir . $tmp_file_name;
$cleanup_target_dir = true;
// Remove old files
$max_file_age = 5 * 3600;
// Temp file age in seconds
// Remove old temp files
if ($cleanup_target_dir) {
if (is_dir($target_dir) && ($dir = opendir($target_dir))) {
while (($file = readdir($dir)) !== false) {
$tmp_file_path = $target_dir . $file;
// Remove temp file if it is older than the max age and is not the current file
if (preg_match('/\\.part$/', $file) && filemtime($tmp_file_path) < time() - $max_file_age && $tmp_file_path != "{$file_path}.part") {
GFCommon::log_debug('GFAsyncUpload::upload(): Deleting file: ' . $tmp_file_path);
@unlink($tmp_file_path);
}
}
closedir($dir);
} else {
GFCommon::log_debug('GFAsyncUpload::upload(): Failed to open temp directory: ' . $target_dir);
self::die_error(100, __('Failed to open temp directory.', 'gravityforms'));
}
}
if (isset($_SERVER['HTTP_CONTENT_TYPE'])) {
$contentType = $_SERVER['HTTP_CONTENT_TYPE'];
}
if (isset($_SERVER['CONTENT_TYPE'])) {
$contentType = $_SERVER['CONTENT_TYPE'];
}
$chunk = isset($_REQUEST['chunk']) ? intval($_REQUEST['chunk']) : 0;
$chunks = isset($_REQUEST['chunks']) ? intval($_REQUEST['chunks']) : 0;
// Handle non multipart uploads older WebKit versions didn't support multipart in HTML5
if (strpos($contentType, 'multipart') !== false) {
if (isset($_FILES['file']['tmp_name']) && is_uploaded_file($_FILES['file']['tmp_name'])) {
// Open temp file
$out = @fopen("{$file_path}.part", $chunk == 0 ? 'wb' : 'ab');
if ($out) {
// Read binary input stream and append it to temp file
$in = @fopen($_FILES['file']['tmp_name'], 'rb');
if ($in) {
while ($buff = fread($in, 4096)) {
fwrite($out, $buff);
}
} else {
self::die_error(101, __('Failed to open input stream.', 'gravityforms'));
}
@fclose($in);
@fclose($out);
@unlink($_FILES['file']['tmp_name']);
} else {
self::die_error(102, __('Failed to open output stream.', 'gravityforms'));
}
} else {
self::die_error(103, __('Failed to move uploaded file.', 'gravityforms'));
}
} else {
// Open temp file
$out = @fopen("{$file_path}.part", $chunk == 0 ? 'wb' : 'ab');
if ($out) {
// Read binary input stream and append it to temp file
$in = @fopen('php://input', 'rb');
if ($in) {
while ($buff = fread($in, 4096)) {
fwrite($out, $buff);
}
} else {
self::die_error(101, __('Failed to open input stream.', 'gravityforms'));
}
@fclose($in);
@fclose($out);
} else {
self::die_error(102, __('Failed to open output stream.', 'gravityforms'));
}
}
// Check if file has been uploaded
if (!$chunks || $chunk == $chunks - 1) {
// Strip the temp .part suffix off
rename("{$file_path}.part", $file_path);
}
if (file_exists($file_path)) {
GFFormsModel::set_permissions($file_path);
} else {
self::die_error(105, __('Upload unsuccessful', 'gravityforms') . ' ' . $uploaded_filename);
}
$output = array('status' => 'ok', 'data' => array('temp_filename' => $tmp_file_name, 'uploaded_filename' => str_replace("\\'", "'", urldecode($uploaded_filename))));
$output = json_encode($output);
GFCommon::log_debug(sprintf('GFAsyncUpload::upload(): File upload complete. temp_filename: %s uploaded_filename: %s ', $tmp_file_name, $uploaded_filename));
gf_do_action('gform_post_multifile_upload', $form['id'], $form, $field, $uploaded_filename, $tmp_file_name, $file_path);
die($output);
}
public static function add_security_files()
{
$upload_root = GFFormsModel::get_upload_root();
if (!is_dir($upload_root)) {
return;
}
GFCommon::recursive_add_index_file($upload_root);
GFCommon::add_htaccess_file();
}
public static function add_htaccess_file()
{
$upload_root = GFFormsModel::get_upload_root();
if (!is_dir($upload_root)) {
return;
}
$htaccess_file = $upload_root . '/.htaccess';
if (file_exists($htaccess_file)) {
unlink($htaccess_file);
}
$txt = '# Disable parsing of PHP for some server configurations. This file may be removed or modified on certain server configurations by using by the gform_upload_root_htaccess_rules filter. Please consult your system administrator before removing this file.
<Files *>
SetHandler none
SetHandler default-handler
Options -ExecCGI
RemoveHandler .cgi .php .php3 .php4 .php5 .phtml .pl .py .pyc .pyo
</Files>
<IfModule mod_php5.c>
php_flag engine off
</IfModule>';
$rules = explode("\n", $txt);
$rules = apply_filters('gform_upload_root_htaccess_rules', $rules);
if (!empty($rules)) {
if (!function_exists('insert_with_markers')) {
require_once ABSPATH . 'wp-admin/includes/misc.php';
}
insert_with_markers($htaccess_file, 'Gravity Forms', $rules);
}
}
public static function add_htaccess_file()
{
$upload_root = GFFormsModel::get_upload_root();
if (!is_dir($upload_root)) {
return;
}
$htaccess_file = $upload_root . '/.htaccess';
if (file_exists($htaccess_file)) {
unlink($htaccess_file);
}
$txt = '# Disable parsing of PHP for some server configurations.
<Files *>
SetHandler none
SetHandler default-handler
Options -ExecCGI
RemoveHandler .cgi .php .php3 .php4 .php5 .phtml .pl .py .pyc .pyo
</Files>
<IfModule mod_php5.c>
php_flag engine off
</IfModule>';
$rules = explode("\n", $txt);
insert_with_markers($htaccess_file, 'Gravity Forms', $rules);
}