value pairs of hidden fields to add to the form.
function __construct($settings, $db) {
// *** constructor ***
$this->db = $db;
$this->db->exec("SET time_zone='+00:00';"); // Execute directly on PDO object, set session to UTC to make our gmdate() values match correctly.
// For debugging, potentially add |robert\.box\.kairo\.at to that regex temporarily.
$this->running_on_localhost = preg_match('/^((.+\.)?localhost|127\.0\.0\.\d+)$/', $_SERVER['SERVER_NAME']);
if (array_key_exists('pwd_cost', $settings)) {
$this->pwd_cost = $settings['pwd_cost'];
}
if (array_key_exists('pwd_nonces', $settings)) {
$this->pwd_nonces = $settings['pwd_nonces'];
}
}
public $db = null;
public $running_on_localhost = false;
public $client_reg_email_whitelist = array('kairo@kairo.at', 'com@kairo.at');
private $pwd_cost = 10;
private $pwd_nonces = array();
function log($code, $info) {
$result = $this->db->prepare('INSERT INTO `auth_log` (`code`, `info`, `ip_addr`) VALUES (:code, :info, :ipaddr);');
if (!$result->execute(array(':code' => $code, ':info' => $info, ':ipaddr' => $_SERVER['REMOTE_ADDR']))) {
// print($result->errorInfo()[2]);
}
}
function checkForSecureConnection() {
$errors = array();
if (($_SERVER['SERVER_PORT'] != 443) && !$this->running_on_localhost) {
$errors[] = _('You are not accessing this site on a secure connection, so authentication doesn\'t work.');
}
return $errors;
}
function sendSecurityHeaders() {
// Send various headers that we want to have for security resons, mostly as recommended by https://observatory.mozilla.org/
// CSP - see https://wiki.mozilla.org/Security/Guidelines/Web_Security#Content_Security_Policy
// Disable unsafe inline/eval, only allow loading of resources (images, fonts, scripts, etc.) from ourselves; also disable framing.
header('Content-Security-Policy: default-src \'none\';img-src \'self\'; script-src \'self\'; style-src \'self\'; frame-ancestors \'none\'');
// X-Content-Type-Options - see https://wiki.mozilla.org/Security/Guidelines/Web_Security#X-Content-Type-Options
// Prevent browsers from incorrectly detecting non-scripts as scripts
header('X-Content-Type-Options: nosniff');
// X-Frame-Options (for older browsers) - see https://wiki.mozilla.org/Security/Guidelines/Web_Security#X-Frame-Options
// Block site from being framed
header('X-Frame-Options: DENY');
// X-XSS-Protection (for older browsers) - see https://wiki.mozilla.org/Security/Guidelines/Web_Security#X-XSS-Protection
// Block pages from loading when they detect reflected XSS attacks
header('X-XSS-Protection: 1; mode=block');
}
function initSession() {
$session = null;
if (strlen(@$_COOKIE['sessionkey'])) {
// Fetch the session - or at least try to.
$result = $this->db->prepare('SELECT * FROM `auth_sessions` WHERE `sesskey` = :sesskey AND `time_expire` > :expire;');
$result->execute(array(':sesskey' => $_COOKIE['sessionkey'], ':expire' => gmdate('Y-m-d H:i:s')));
$row = $result->fetch(PDO::FETCH_ASSOC);
if ($row) {
$session = $row;
}
}
if (is_null($session)) {
// Create new session and set cookie.
$sesskey = $this->createSessionKey();
setcookie('sessionkey', $sesskey, 0, "", "", !$this->running_on_localhost, true); // Last two params are secure and httponly, secure is not set on localhost.
$result = $this->db->prepare('INSERT INTO `auth_sessions` (`sesskey`, `time_expire`) VALUES (:sesskey, :expire);');
$result->execute(array(':sesskey' => $sesskey, ':expire' => gmdate('Y-m-d H:i:s', strtotime('+5 minutes'))));
// After insert, actually fetch the session row from the DB so we have all values.
$result = $this->db->prepare('SELECT * FROM auth_sessions WHERE `sesskey` = :sesskey AND `time_expire` > :expire;');
$result->execute(array(':sesskey' => $sesskey, ':expire' => gmdate('Y-m-d H:i:s')));
$row = $result->fetch(PDO::FETCH_ASSOC);
if ($row) {
$session = $row;
}
else {
$this->log('session_create_failure', 'key: '.$sesskey);
}
}
return $session;
}
function getLoginSession($userid, $prev_session) {
$session = $prev_session;
$sesskey = $this->createSessionKey();
setcookie('sessionkey', $sesskey, 0, "", "", !$this->running_on_localhost, true); // Last two params are secure and httponly, secure is not set on localhost.
// If the previous session has a user set, create a new one - otherwise take existing session entry.
if (intval($session['user'])) {
$result = $this->db->prepare('INSERT INTO `auth_sessions` (`sesskey`, `time_expire`, `user`, `logged_in`) VALUES (:sesskey, :expire, :userid, TRUE);');
$result->execute(array(':sesskey' => $sesskey, ':userid' => $userid, ':expire' => gmdate('Y-m-d H:i:s', strtotime('+1 day'))));
// After insert, actually fetch the session row from the DB so we have all values.
$result = $this->db->prepare('SELECT * FROM auth_sessions WHERE `sesskey` = :sesskey AND `time_expire` > :expire;');
$result->execute(array(':sesskey' => $sesskey, ':expire' => gmdate('Y-m-d H:i:s')));
$row = $result->fetch(PDO::FETCH_ASSOC);
if ($row) {
$session = $row;
}
else {
$utils->log('create_session_failure', 'at login, prev session: '.$session['id'].', new user: '.$userid);
$errors[] = _('The session system is not working.').' '._('Please contact KaiRo.at and tell the team about this.');
}
}
else {
$result = $this->db->prepare('UPDATE `auth_sessions` SET `sesskey` = :sesskey, `user` = :userid, `logged_in` = TRUE, `time_expire` = :expire WHERE `id` = :sessid;');
if (!$result->execute(array(':sesskey' => $sesskey, ':userid' => $userid, ':expire' => gmdate('Y-m-d H:i:s', strtotime('+1 day')), ':sessid' => $session['id']))) {
$utils->log('login_failure', 'session: '.$session['id'].', user: '.$userid);
$errors[] = _('Login failed unexpectedly.').' '._('Please contact KaiRo.at and tell the team about this.');
}
else {
// After update, actually fetch the session row from the DB so we have all values.
$result = $this->db->prepare('SELECT * FROM auth_sessions WHERE `sesskey` = :sesskey AND `time_expire` > :expire;');
$result->execute(array(':sesskey' => $sesskey, ':expire' => gmdate('Y-m-d H:i:s')));
$row = $result->fetch(PDO::FETCH_ASSOC);
if ($row) {
$session = $row;
}
}
}
return $session;
}
function setRedirect($session, $redirect) {
$success = false;
// Save the request in the session so we can get back to fulfilling it if one of the links is clicked.
$result = $this->db->prepare('UPDATE `auth_sessions` SET `saved_redirect` = :redir WHERE `id` = :sessid;');
if (!$result->execute(array(':redir' => $redirect, ':sessid' => $session['id']))) {
$this->log('redir_save_failure', 'session: '.$session['id'].', redirect: '.$redirect);
}
else {
$success = true;
}
return $success;
}
function doRedirectIfSet($session) {
$success = false;
// If the session has a redirect set, make sure it's performed.
if (strlen(@$session['saved_redirect'])) {
// Remove redirect.
$result = $this->db->prepare('UPDATE `auth_sessions` SET `saved_redirect` = :redir WHERE `id` = :sessid;');
if (!$result->execute(array(':redir' => '', ':sessid' => $session['id']))) {
$this->log('redir_save_failure', 'session: '.$session['id'].', redirect: (empty)');
}
else {
$success = true;
}
header('Location: '.$this->getDomainBaseURL().$session['saved_redirect']);
}
return $success;
}
function resetRedirect($session) {
$success = false;
// If the session has a redirect set, remove it.
if (strlen(@$session['saved_redirect'])) {
$result = $this->db->prepare('UPDATE `auth_sessions` SET `saved_redirect` = :redir WHERE `id` = :sessid;');
if (!$result->execute(array(':redir' => '', ':sessid' => $session['id']))) {
$this->log('redir_save_failure', 'session: '.$session['id'].', redirect: (empty)');
}
else {
$success = true;
}
}
return $success;
}
function getDomainBaseURL() {
return ($this->running_on_localhost?'http':'https').'://'.$_SERVER['SERVER_NAME'];
}
function checkPasswordConstraints($new_password, $user_email) {
$errors = array();
if ($new_password != trim($new_password)) {
$errors[] = _('Password must not start or end with a whitespace character like a space.');
}
if (strlen($new_password) < 8) { $errors[] = sprintf(_('Password too short (min. %s characters).'), 8); }
if (strlen($new_password) > 70) { $errors[] = sprintf(_('Password too long (max. %s characters).'), 70); }
if ((strtolower($new_password) == strtolower($user_email)) ||
in_array(strtolower($new_password), preg_split("/[@\.]+/", strtolower($user_email)))) {
$errors[] = _('The passwort can not be equal to your email or any part of it.');
}
if ((strlen($new_password) < 15) && (preg_match('/^[a-zA-Z]+$/', $new_password))) {
$errors[] = sprintf(_('Your password must use characters other than normal letters or contain least %s characters.'), 15);
}
if (preg_match('/^\d+$/', $new_password)) {
$errors[] = sprintf(_('Your password cannot consist only of numbers.'), 15);
}
if (strlen(count_chars($new_password, 3)) < 5) {
$errors[] = sprintf(_('Password does have to contain at least %s different characters.'), 5);
}
return $errors;
}
function createSessionKey() {
return bin2hex(openssl_random_pseudo_bytes(512 / 8)); // Get 512 bits of randomness (128 byte hex string).
}
function createVerificationCode() {
return bin2hex(openssl_random_pseudo_bytes(512 / 8)); // Get 512 bits of randomness (128 byte hex string).
}
function createClientSecret() {
return bin2hex(openssl_random_pseudo_bytes(160 / 8)); // Get 160 bits of randomness (40 byte hex string).
}
function createTimeCode($session, $offset = null, $validity_minutes = 10) {
// Matches TOTP algorithms, see https://en.wikipedia.org/wiki/Time-based_One-time_Password_Algorithm
$valid_seconds = intval($validity_minutes) * 60;
if ($valid_seconds < 60) { $valid_seconds = 60; }
$code_digits = 8;
$time = time();
$rest = is_null($offset)?($time % $valid_seconds):intval($offset); // T0, will be sent as part of code to make it valid for the full duration.
$counter = floor(($time - $rest) / $valid_seconds);
$hmac = mhash(MHASH_SHA1, $counter, $session['id'].$session['sesskey']);
$offset = hexdec(substr(bin2hex(substr($hmac, -1)), -1)); // Get the last 4 bits as a number.
$totp = hexdec(bin2hex(substr($hmac, $offset, 4))) & 0x7FFFFFFF; // Take 4 bytes at the offset, discard highest bit.
$totp_value = sprintf('%0'.$code_digits.'d', substr($totp, -$code_digits));
return $rest.'.'.$totp_value;
}
function verifyTimeCode($timecode_to_verify, $session, $validity_minutes = 10) {
if (preg_match('/^(\d+)\.\d+$/', $timecode_to_verify, $regs)) {
return ($timecode_to_verify === $this->createTimeCode($session, $regs[1], $validity_minutes));
}
return false;
}
function pwdHash($new_password) {
$hash_prefix = '';
if (count($this->pwd_nonces)) {
$new_password .= $this->pwd_nonces[count($this->pwd_nonces) - 1];
$hash_prefix = (count($this->pwd_nonces) - 1).'|';
}
return $hash_prefix.password_hash($new_password, PASSWORD_DEFAULT, array('cost' => $this->pwd_cost));
}
function pwdVerify($password_to_verify, $userdata) {
$pwdhash = $userdata['pwdhash'];
if (preg_match('/^(\d+)\|(.+)$/', $userdata['pwdhash'], $regs)) {
$password_to_verify .= $this->pwd_nonces[$regs[1]];
$pwdhash = $regs[2];
}
return password_verify($password_to_verify, $pwdhash);
}
function pwdNeedsRehash($userdata) {
$nonceid = -1;
$pwdhash = $userdata['pwdhash'];
if (preg_match('/^(\d+)\|(.+)$/', $userdata['pwdhash'], $regs)) {
$nonceid = $regs[1];
$pwdhash = $regs[2];
}
if ($nonceid == count($this->pwd_nonces) - 1) {
return password_needs_rehash($pwdhash, PASSWORD_DEFAULT, array('cost' => $this->pwd_cost));
}
else {
return true;
}
}
function negotiateLocale($supportedLanguages) {
$nlocale = $supportedLanguages[0];
$headers = getAllHeaders();
$accLcomp = explode(',', @$headers['Accept-Language']);
$accLang = array();
foreach ($accLcomp as $lcomp) {
if (strlen($lcomp)) {
$ldef = explode(';', $lcomp);
$accLang[$ldef[0]] = (float)((strpos(@$ldef[1],'q=')===0)?substr($ldef[1],2):1);
}
}
if (count($accLang)) {
$pLang = ''; $pLang_q = 0;
foreach ($supportedLanguages as $wantedLang) {
if (isset($accLang[$wantedLang]) && ($accLang[$wantedLang] > $pLang_q)) {
$pLang = $wantedLang;
$pLang_q = $accLang[$wantedLang];
}
}
if (strlen($pLang)) { $nlocale = $pLang; }
}
return $nlocale;
}
function getGroupedEmails($group_id, $exclude_email = '') {
$emails = array();
if (intval($group_id)) {
$result = $this->db->prepare('SELECT `email` FROM `auth_users` WHERE `group_id` = :groupid AND `status` = \'ok\' AND `email` != :excludemail ORDER BY `email` ASC;');
$result->execute(array(':groupid' => $group_id, ':excludemail' => $exclude_email));
foreach ($result->fetchAll(PDO::FETCH_ASSOC) as $row) {
$emails[] = $row['email'];
}
}
return $emails;
}
function initHTMLDocument($titletext, $headlinetext = null) {
global $settings;
if (is_null($headlinetext)) { $headlinetext = $titletext; }
// Start HTML document as a DOM object.
extract(ExtendedDocument::initHTML5()); // sets $document, $html, $head, $title, $body
$document->formatOutput = true; // we want a nice output
$style = $head->appendElement('link');
$style->setAttribute('rel', 'stylesheet');
$style->setAttribute('href', 'authsystem.css');
$head->appendJSFile('authsystem.js');
if ($settings['piwik_enabled']) {
$head->setAttribute('data-piwiksite', $settings['piwik_site_id']);
$head->setAttribute('data-piwikurl', $settings['piwik_url']);
$head->appendJSFile('piwik.js', true, true);
}
$title->appendText($titletext);
$h1 = $body->appendElement('h1', $headlinetext);
if ($settings['piwik_enabled']) {
// Piwik noscript element
$noscript = $body->appendElement('noscript');
$para = $noscript->appendElement('p');
$img = $para->appendImage($settings['piwik_url'].'piwik.php?idsite='.$settings['piwik_site_id']);
$img->setAttribute('style', 'border:0;');
}
// Make the document not be scaled on mobile devices.
$vpmeta = $head->appendElement('meta');
$vpmeta->setAttribute('name', 'viewport');
$vpmeta->setAttribute('content', 'width=device-width, height=device-height');
$para = $body->appendElement('p', _('This login system does not work without JavaScript. Please activate JavaScript for this site to log in.'));
$para->setAttribute('id', 'jswarning');
$para->setAttribute('class', 'warn');
return array('document' => $document,
'html' => $html,
'head' => $head,
'title' => $title,
'body' => $body);
}
function appendLoginForm($dom_element, $session, $user, $addfields = array()) {
$form = $dom_element->appendForm('./', 'POST', 'loginform');
$form->setAttribute('id', 'loginform');
$form->setAttribute('class', 'loginarea hidden');
$ulist = $form->appendElement('ul');
$ulist->setAttribute('class', 'flat login');
$litem = $ulist->appendElement('li');
$inptxt = $litem->appendInputEmail('email', 30, 20, 'login_email', (intval(@$user['id'])?$user['email']:''));
$inptxt->setAttribute('autocomplete', 'email');
$inptxt->setAttribute('required', '');
$inptxt->setAttribute('placeholder', _('Email'));
$inptxt->setAttribute('class', 'login');
$litem = $ulist->appendElement('li');
$inptxt = $litem->appendInputPassword('pwd', 20, 20, 'login_pwd', '');
$inptxt->setAttribute('required', '');
$inptxt->setAttribute('placeholder', _('Password'));
$inptxt->setAttribute('class', 'login');
$litem = $ulist->appendElement('li');
$litem->appendLink('./?reset', _('Forgot password?'));
/*
$litem = $ulist->appendElement('li');
$cbox = $litem->appendInputCheckbox('remember', 'login_remember', 'true', false);
$cbox->setAttribute('class', 'logincheck');
$label = $litem->appendLabel('login_remember', _('Remember me'));
$label->setAttribute('id', 'rememprompt');
$label->setAttribute('class', 'loginprompt');
*/
$litem = $ulist->appendElement('li');
$litem->appendInputHidden('tcode', $this->createTimeCode($session));
foreach ($addfields as $fname => $fvalue) {
$litem->appendInputHidden($fname, $fvalue);
}
$submit = $litem->appendInputSubmit(_('Log in / Register'));
$submit->setAttribute('class', 'loginbutton');
}
}
?>