function _backup_migrate_destination_file_check_web_dir in Backup and Migrate 5.2

Check that a web accessible directory has been properly secured, othewise attempt to secure it.

1 call to _backup_migrate_destination_file_check_web_dir()

_backup_migrate_destination_file_check_dir in includes/destinations.file.inc

Prepare the destination directory for the backups.

File

includes/destinations.file.inc, line 105

Functions to handle the local server directory backup destinations.

Code

function _backup_migrate_destination_file_check_web_dir($directory) {

  // Check for a htaccess file which adequately protects the backup files.
  $htaccess_lines = "order allow,deny\ndeny from all\n";
  if (!is_file($directory . '/.htaccess') || strpos(file_get_contents($directory . '/.htaccess'), $htaccess_lines) === FALSE) {

    // Attempt to protect the backup files from public access using htaccess.
    if (($fp = @fopen($directory . '/.htaccess', 'w')) && @fputs($fp, $htaccess_lines)) {
      fclose($fp);
      chmod($directory . '/.htaccess', 0664);
    }
    else {
      $message = "Security warning: Couldn't modify .htaccess file. Please create a .htaccess file in your %directory directory which contains the following lines: <code>!htaccess</code> or add them to the existing .htaccess file";
      $replace = array(
        '%directory' => $directory,
        '!htaccess' => '<br />' . nl2br(check_plain($htaccess_lines)),
      );
      drupal_set_message(t($message, $replace), "error");
      watchdog('security', t($message, $replace), WATCHDOG_ERROR);
      return FALSE;
    }
  }

  // Check the user agent to make sure we're not responding to a request from drupal itself.
  // That should prevent infinite loops which could be caused by poormanscron in some circumstances.
  if (strpos($_SERVER['HTTP_USER_AGENT'], 'Drupal') !== FALSE) {
    return FALSE;
  }

  // Check to see if the destination is publicly accessible
  $test_contents = "this file should not be publicly accesible";

  // Create the the text.txt file if it's not already there.
  if (!is_file($directory . '/test.txt') || file_get_contents($directory . '/test.txt') != $test_contents) {
    if ($fp = fopen($directory . '/test.txt', 'w')) {
      @fputs($fp, $test_contents);
      fclose($fp);
    }
    else {
      $message = t("Security notice: Backup and Migrate was unable to write a test text file to the destination directory %directory, and is therefore unable to check the security of the backup destination. Backups to the server will be disabled until the destination becomes writable and secure.", array(
        '%directory' => $directory,
      ));
      drupal_set_message($message, "error");
      return FALSE;
    }
  }

  // Attempt to read the test file via http. This may fail for other reasons,
  // so it's not a bullet-proof check.
  $path = trim(drupal_substr($directory . '/test.txt', drupal_strlen(file_directory_path())), '\\/');
  if (_backup_migrate_test_file_readable_remotely($filename, $contents)) {
    $message = t("Security notice: Backup and Migrate will not save backup files to the server because the destination directory is publicly accessible. If you want to save files to the server, please secure the '%directory' directory", array(
      '%directory' => $directory,
    ));
    drupal_set_message($message, "error");
    return FALSE;
  }
  return $directory;
}