Last updated March 7, 2011. Created by bfroehle on March 7, 2011.
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You can limit the list of users allowed to log in with CAS by creating a custom module. The basic template for the module is provided below. Note that the CAS API changed from 6.x-2.x to 6.x-3.x/7.x-1.x.
CAS 6.x-2.x
Create a module which implements hook_auth_filter().
<?php
/**
* Implements hook_auth_filter().
*
* Limit logins to a list of specified users.
*/
function MODULE_auth_filter($module, $cas_name) {
if ($module != 'cas') {
// Do not filter non-CAS users.
return TRUE;
}
$allowed_users = array(
'netid1',
'netid2',
'netid3',
);
return in_array($cas_name, $allowed_users);
}
?>CAS 6.x-3.x or 7.x-1.x
Create a module which implements hook_cas_user_alter(). See the provided cas.api.php for more information. Sample code is provided below:
<?php
/**
* Implements hook_cas_user_alter().
*
* Limit logins to a list of specified users.
*/
function MODULE_cas_user_alter(&$cas_user) {
// Extract the CAS username.
$cas_name = $cas_user['name'];
$allowed_users = array(
'netid1',
'netid2',
'netid3',
);
if (!in_array($cas_name, $allowed_users)) {
// If the user is not in the specified list of allowed users,
// we do not allow the user to log in.
$cas_user['login'] = FALSE;
}
}
?>