silverstripe-framework/src/Security/PasswordEncryptor.php
2016-11-29 12:31:16 +13:00

106 lines
3.1 KiB
PHP

<?php
namespace SilverStripe\Security;
use SilverStripe\Core\Config\Config;
use ReflectionClass;
/**
* Allows pluggable password encryption.
* By default, this might be PHP's integrated sha1()
* function, but could also be more sophisticated to facilitate
* password migrations from other systems.
* Use {@link register()} to add new implementations.
*
* Used in {@link Security::encrypt_password()}.
*/
abstract class PasswordEncryptor
{
/**
* @var array
* @config
*/
private static $encryptors = array();
/**
* @return array Map of encryptor code to the used class.
*/
public static function get_encryptors()
{
return Config::inst()->get('SilverStripe\\Security\\PasswordEncryptor', 'encryptors');
}
/**
* @param String $algorithm
* @return PasswordEncryptor
* @throws PasswordEncryptor_NotFoundException
*/
public static function create_for_algorithm($algorithm)
{
$encryptors = self::get_encryptors();
if (!isset($encryptors[$algorithm])) {
throw new PasswordEncryptor_NotFoundException(
sprintf('No implementation found for "%s"', $algorithm)
);
}
$class=key($encryptors[$algorithm]);
if (!class_exists($class)) {
throw new PasswordEncryptor_NotFoundException(
sprintf('No class found for "%s"', $class)
);
}
$refClass = new ReflectionClass($class);
if (!$refClass->getConstructor()) {
return new $class;
}
$arguments = $encryptors[$algorithm];
return($refClass->newInstanceArgs($arguments));
}
/**
* Return a string value stored in the {@link Member->Password} property.
* The password should be hashed with {@link salt()} if applicable.
*
* @param String $password Cleartext password to be hashed
* @param String $salt (Optional)
* @param Member $member (Optional)
* @return String Maximum of 512 characters.
*/
abstract public function encrypt($password, $salt = null, $member = null);
/**
* Return a string value stored in the {@link Member->Salt} property.
*
* @uses RandomGenerator
*
* @param string $password Cleartext password
* @param Member $member (Optional)
* @return string Maximum of 50 characters
*/
public function salt($password, $member = null)
{
$generator = new RandomGenerator();
return substr($generator->randomToken('sha1'), 0, 50);
}
/**
* This usually just returns a strict string comparison,
* but is necessary for retain compatibility with password hashed
* with flawed algorithms - see {@link PasswordEncryptor_LegacyPHPHash} and
* {@link PasswordEncryptor_Blowfish}
*
* @param string $hash
* @param string $password
* @param string $salt
* @param Member $member
* @return bool
*/
public function check($hash, $password, $salt = null, $member = null)
{
return $hash === $this->encrypt($password, $salt, $member);
}
}