Disable adding of own accounts

[kroerig]

Feature Request

From https://help.nextcloud.com/t/disable-setting-add-new-mail-account/106160

Users can add their own accounts. It should be possible to disable this function globally.

Summary

Adding external accounts could break data protecion rules.

[mrAceT]

I really needed this functionality so i performed this hack in my config.php:

$user = !empty($_COOKIE['nc_username']) ? $_COOKIE['nc_username'] : '';
if (empty($user) && !empty($_SERVER['PHP_AUTH_USER']) ) {
  $user = $_SERVER['PHP_AUTH_USER'];
}
else if (empty($user) && !empty($_SERVER['REQUEST_URI']) && preg_match('/\/(dav\/files|users?)\/([^\/]+)/',$_SERVER['REQUEST_URI'],$matches) ) {
  $user = $matches[2];
}
else if (empty($user) && strpos($_SERVER['PHP_SELF'],'/cron.php') > 0 ) {
  $user = '> CRON call <';
}
if ( !empty($user) && $user != '> CRON call <'
############### exclude your users here that do get access #
 && ($user != 'admin_user' && $user != 'another_admin_user')
############################################################
 && strpos($_SERVER['PHP_SELF'],'/mail/') > 0 # or put 'mail/setup' here if you want to disable the ability to create/add a mail account
) {
 die('you have no access to this part of the site'); 
}