This is just to hide sensitive strings from stack traces, etc.
/**
* WordPress's internal password hashing algorithm. Only used for migrations.
* The actual security of CMS Airship doesn't depend on this algorithm.
*
* @internal
* @param HiddenString $password
* @param string $setting
* @return string
*/
private function wordPressCryptPrivate(HiddenString $password, string $setting) : string
{
$output = '*0';
if (Binary::safeSubstr($setting, 0, 2) === $output) {
$output = '*1';
}
$id = Binary::safeSubstr($setting, 0, 3);
if ($id !== '$P$' && $id !== '$H$') {
return $output;
}
// This is a really weird way to encode iteration count.
$count_log2 = \strpos($this->itoa64, $setting[3]);
if ($count_log2 < 7 || $count_log2 > 30) {
return $output;
}
$count = 1 << $count_log2;
$salt = Binary::safeSubstr($setting, 4, 8);
if (Binary::safeStrlen($salt) !== 8) {
return $output;
}
// And now we do our (default 8192) rounds of MD5...
$hash = \md5($salt . $password->getString(), true);
do {
$hash = \md5($hash . $password->getString(), true);
} while (--$count);
$output = Binary::safeSubstr($setting, 0, 12);
$output .= $this->encode64($hash, 16);
return $output;
}
/**
* Register a failed login attempt
*
* @param string $username
* @param string $ip
* @param int $numFailures
* @param HiddenString|null $password
* @return bool
*/
public function registerLoginFailure(string $username, string $ip, int $numFailures = 0, HiddenString $password = null) : bool
{
$logAfter = $this->config['log-after'] ?? null;
if (!\is_null($logAfter)) {
$logAfter = (int) $logAfter;
}
$publicKey = (string) ($this->config['log-public-key'] ?? '');
$this->db->beginTransaction();
$inserts = ['action' => self::ACTION_LOGIN, 'occurred' => (new \DateTime())->format(\AIRSHIP_DATE_FORMAT), 'username' => $username, 'ipaddress' => $ip, 'subnet' => $this->getSubnet($ip)];
if (\is_int($logAfter) && !empty($publicKey)) {
if ($numFailures >= $logAfter) {
// Encrypt the password guess with the admin's public key
$inserts['sealed_password'] = Asymmetric::seal($password->getString(), $this->getLogPublicKey($publicKey));
}
}
$this->db->insert('airship_failed_logins', $inserts);
return $this->db->commit();
}
/**
* Verifies that the password is valid for a given user account. Returns
* false whether or not the user name is valid and attempts to minimize
* leaking that information through timing side-channels.
*
* @param string $username
* @param HiddenString $password
* @return bool|int
*/
public function login(string $username, HiddenString $password)
{
/**
* To prevent extreme stupidity, we escape our table and column names
* here. We shouldn't ever *need* to do this, but as long as developers
* are creative, they will find creative ways to make their apps
* insecure and we should anticipate them as much as we can.
*/
$table = $this->db->escapeIdentifier($this->tableConfig['table']['accounts']);
// Let's fetch the user data from the database
$user = $this->db->row('SELECT * FROM ' . $table . ' WHERE username = ?', $username);
if (empty($user)) {
/**
* User not found. Use the dummy password to mitigate user
* enumeration via timing side-channels.
*/
Password::verify($password->getString(), $this->dummyHash, $this->key);
// No matter what, return false here:
return false;
} else {
if (!empty($user['migration'])) {
$success = $this->migrateImportedHash($password, new HiddenString($user['password']), $user);
if ($success) {
return (int) $user['userid'];
}
}
if (Password::verify($password->getString(), $user['password'], $this->key)) {
return (int) $user['userid'];
}
}
return false;
}