function do_login($username = NULL, $password = NULL, $force_login = FALSE)
{
global $auth_settings;
destroy_expired_sessions();
$session_key = $_COOKIE[$auth_settings['cookie_name']];
$username = trim($username);
// Check for session if forced login not specified
if ($force_login != TRUE) {
$login_id = session_key_to_login_id($session_key);
if ($login_id !== FALSE) {
//echo "Session detected!\n<br>";
return $login_id;
}
} else {
// Destroy any prior session on a forced login
destroy_session($session_key);
}
if (is_null($username)) {
$username = $_POST['username'];
}
if (is_null($password)) {
$password = $_POST['password'];
}
// Don't allow logins for locked out accounts
$lo = check_lockout($username);
if ($lo != 0) {
auth_lockout(NULL, NULL, $username);
return -1;
}
// Authenticate credentials and take lockout actions as required
$login_id = authenticate_user($username, $password);
if ($login_id > 0) {
create_session(NULL, $login_id);
return $login_id;
} else {
destroy_session($session_key);
// Good user name, bad password
if ($login_id == -1) {
auth_lockout(NULL, NULL, $username);
}
// Bad user name
if ($login_id == -2) {
auth_lockout();
}
return -2;
}
return -255;
}
// Verify the user has a session; otherwise bounce to login page
require_once 'lib_auth.php';
$uri = $_SERVER['REQUEST_URI'];
if ($validated != TRUE) {
$validated = FALSE;
}
if (array_key_exists("uri", $_REQUEST)) {
$r_uri = $_REQUEST['uri'];
} else {
$r_uri = "index.php";
}
// Don't validate a session that does not exist
if (array_key_exists("php_sa_session", $_COOKIE)) {
$session_key = $_COOKIE['php_sa_session'];
destroy_expired_sessions();
$login_id = session_key_to_login_id($session_key);
if ($login_id !== FALSE && $login_id !== NULL && $login_id >= 0) {
$validated = TRUE;
}
}
// Don't let the user loop on login-specific pages forever
if (preg_match("#/login.php#i", $uri) == 1 || preg_match("#/authenticate.php#i", $uri) == 1) {
if ($validated == TRUE) {
//print "<br>validated = true<br>\n";
$r_uri = preg_replace("/login.php.*/i", "index.php", $r_uri);
$r_uri = preg_replace("/authenticate.php.*/i", "index.php", $r_uri);
//print "non-loop redirect: $r_uri\n";
header("Location: {$r_uri}");
exit;
}