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Move all functionality of old Password class to new Password class
This commit is contained in:
Kijin Sung
parent
642f048f64
commit
f4dc7e6b21
3 changed files with 73 additions and 316 deletions
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@ -1,366 +1,76 @@
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<?php
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/* Copyright (C) NAVER <http://www.navercorp.com> */
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/**
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* This class can be used to hash passwords using various algorithms and check their validity.
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* It is fully compatible with previous defaults, while also supporting bcrypt and pbkdf2.
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*
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* @file Password.class.php
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* @author Kijin Sung (kijin@kijinsung.com)
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* @package /classes/security
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* @version 1.1
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*/
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class Password
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{
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/**
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* @brief Custom algorithms are stored here
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* @var array
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*/
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protected static $_custom = array();
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/**
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* @brief Register a custom algorithm for password checking
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* @param string $name The name of the algorithm
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* @param string $regexp The regular expression to detect the algorithm
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* @param callable $callback The function to call to regenerate the hash
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* @return void
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*/
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public static function registerCustomAlgorithm($name, $regexp, $callback)
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{
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self::$_custom[$name] = array('regexp' => $regexp, 'callback' => $callback);
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Rhymix\Framework\Password::addAlgorithm($name, $regexp, $callback);
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}
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/**
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* @brief Return the list of hashing algorithms supported by this server
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* @return array
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*/
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public function getSupportedAlgorithms()
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{
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$retval = array();
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if(function_exists('hash_hmac') && in_array('sha256', hash_algos()))
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{
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$retval['pbkdf2'] = 'pbkdf2';
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}
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if(version_compare(PHP_VERSION, '5.3.7', '>=') && defined('CRYPT_BLOWFISH'))
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{
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$retval['bcrypt'] = 'bcrypt';
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}
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$retval['md5'] = 'md5';
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return $retval;
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return Rhymix\Framework\Password::getSupportedAlgorithms();
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}
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/**
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* @brief Return the best hashing algorithm supported by this server
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* @return string
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*/
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public function getBestAlgorithm()
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{
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$algos = $this->getSupportedAlgorithms();
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return key($algos);
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return Rhymix\Framework\Password::getBestSupportedAlgorithm();
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}
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/**
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* @brief Return the currently selected hashing algorithm
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* @return string
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*/
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public function getCurrentlySelectedAlgorithm()
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{
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if(function_exists('getModel'))
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{
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$config = getModel('member')->getMemberConfig();
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$algorithm = $config->password_hashing_algorithm;
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if(strval($algorithm) === '')
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{
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$algorithm = 'md5'; // Historical default for XE
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}
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}
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else
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{
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$algorithm = 'md5';
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}
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return $algorithm;
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return Rhymix\Framework\Password::getDefaultAlgorithm();
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}
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/**
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* @brief Return the currently configured work factor for bcrypt and other adjustable algorithms
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* @return int
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*/
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public function getWorkFactor()
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{
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if(function_exists('getModel'))
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{
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$config = getModel('member')->getMemberConfig();
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$work_factor = $config->password_hashing_work_factor;
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if(!$work_factor || $work_factor < 4 || $work_factor > 31)
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{
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$work_factor = 8; // Reasonable default
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}
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}
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else
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{
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$work_factor = 8;
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}
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return $work_factor;
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return Rhymix\Framework\Password::getWorkFactor();
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}
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/**
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* @brief Create a hash using the specified algorithm
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* @param string $password The password
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* @param string $algorithm The algorithm (optional)
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* @return string
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*/
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public function createHash($password, $algorithm = null)
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{
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if($algorithm === null)
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{
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$algorithm = $this->getCurrentlySelectedAlgorithm();
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}
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if(!array_key_exists($algorithm, $this->getSupportedAlgorithms()))
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{
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return false;
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}
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$password = trim($password);
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switch($algorithm)
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{
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case 'md5':
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return md5($password);
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case 'pbkdf2':
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$iterations = pow(2, $this->getWorkFactor() + 5);
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$salt = $this->createSecureSalt(12, 'alnum');
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$hash = base64_encode($this->pbkdf2($password, $salt, 'sha256', $iterations, 24));
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return 'sha256:'.sprintf('%07d', $iterations).':'.$salt.':'.$hash;
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case 'bcrypt':
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return $this->bcrypt($password);
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default:
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return false;
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}
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return Rhymix\Framework\Password::hashPassword($password, $algorithm);
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}
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/**
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* @brief Check if a password matches a hash
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* @param string $password The password
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* @param string $hash The hash
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* @param string $algorithm The algorithm (optional)
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* @return bool
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*/
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public function checkPassword($password, $hash, $algorithm = null)
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{
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if($algorithm === null)
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{
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$algorithm = $this->checkAlgorithm($hash);
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}
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$password = trim($password);
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switch($algorithm)
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{
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case 'md5':
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return md5($password) === $hash || md5(sha1(md5($password))) === $hash;
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case 'mysql_old_password':
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return (class_exists('Context') && substr(Context::getDBType(), 0, 5) === 'mysql') ?
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DB::getInstance()->isValidOldPassword($password, $hash) : false;
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case 'mysql_password':
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return $hash[0] === '*' && substr($hash, 1) === strtoupper(sha1(sha1($password, true)));
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case 'pbkdf2':
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$hash = explode(':', $hash);
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$hash[3] = base64_decode($hash[3]);
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$hash_to_compare = $this->pbkdf2($password, $hash[2], $hash[0], intval($hash[1], 10), strlen($hash[3]));
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return Rhymix\Framework\Security::compareStrings($hash_to_compare, $hash[3]);
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case 'bcrypt':
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$hash_to_compare = $this->bcrypt($password, $hash);
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return Rhymix\Framework\Security::compareStrings($hash_to_compare, $hash);
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default:
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if($algorithm && isset(self::$_custom[$algorithm]))
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{
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$hash_callback = self::$_custom[$algorithm]['callback'];
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$hash_to_compare = $hash_callback($password, $hash);
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return Rhymix\Framework\Security::compareStrings($hash_to_compare, $hash);
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}
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if(in_array($algorithm, hash_algos()))
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{
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return Rhymix\Framework\Security::compareStrings(hash($algorithm, $password), $hash);
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}
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return false;
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}
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return Rhymix\Framework\Password::checkPassword($password, $hash, $algorithm);
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}
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/**
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* @brief Check the algorithm used to create a hash
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* @param string $hash The hash
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* @return string
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*/
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function checkAlgorithm($hash)
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{
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foreach(self::$_custom as $name => $definition)
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{
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if(preg_match($definition['regexp'], $hash))
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{
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return $name;
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}
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}
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if(preg_match('/^\$2[axy]\$([0-9]{2})\$/', $hash, $matches))
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{
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return 'bcrypt';
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}
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elseif(preg_match('/^sha[0-9]+:([0-9]+):/', $hash, $matches))
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{
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return 'pbkdf2';
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}
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elseif(strlen($hash) === 32 && ctype_xdigit($hash))
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{
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return 'md5';
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}
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elseif(strlen($hash) === 40 && ctype_xdigit($hash))
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{
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return 'sha1';
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}
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elseif(strlen($hash) === 64 && ctype_xdigit($hash))
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{
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return 'sha256';
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}
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elseif(strlen($hash) === 96 && ctype_xdigit($hash))
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{
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return 'sha384';
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}
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elseif(strlen($hash) === 128 && ctype_xdigit($hash))
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{
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return 'sha512';
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}
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elseif(strlen($hash) === 16 && ctype_xdigit($hash))
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{
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return 'mysql_old_password';
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}
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elseif(strlen($hash) === 41 && $hash[0] === '*')
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{
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return 'mysql_password';
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}
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else
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{
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return false;
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}
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$algos = Rhymix\Framework\Password::checkAlgorithm($hash);
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return count($algos) ? $algos[0] : false;
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}
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/**
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* @brief Check the work factor of a hash
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* @param string $hash The hash
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* @return int
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*/
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function checkWorkFactor($hash)
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{
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if(preg_match('/^\$2[axy]\$([0-9]{2})\$/', $hash, $matches))
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{
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return intval($matches[1], 10);
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}
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elseif(preg_match('/^sha[0-9]+:([0-9]+):/', $hash, $matches))
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{
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return max(0, round(log($matches[1], 2)) - 5);
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}
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else
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{
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return false;
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}
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return Rhymix\Framework\Password::checkWorkFactor($hash);
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}
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/**
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* @brief Generate a cryptographically secure random string to use as a salt
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* @param int $length The number of bytes to return
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* @param string $format hex or alnum
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* @return string
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*/
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public function createSecureSalt($length, $format = 'hex')
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{
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return Rhymix\Framework\Security::getRandom($length, $format);
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}
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/**
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* @brief Generate a temporary password using the secure salt generator
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* @param int $length The number of bytes to return
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* @return string
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*/
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public function createTemporaryPassword($length = 16)
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{
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while(true)
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{
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$source = base64_encode($this->createSecureSalt(64, 'binary'));
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$source = strtr($source, 'iIoOjl10/', '@#$%&*-!?');
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$source_length = strlen($source);
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for($i = 0; $i < $source_length - $length; $i++)
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{
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$candidate = substr($source, $i, $length);
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if(preg_match('/[a-z]/', $candidate) && preg_match('/[A-Z]/', $candidate) &&
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preg_match('/[0-9]/', $candidate) && preg_match('/[^a-zA-Z0-9]/', $candidate))
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{
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return $candidate;
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}
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}
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}
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return Rhymix\Framework\Password::getRandomPassword($length);
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}
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/**
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* @brief Generate the PBKDF2 hash of a string using a salt
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* @param string $password The password
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* @param string $salt The salt
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* @param string $algorithm The algorithm (optional, default is sha256)
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* @param int $iterations Iteration count (optional, default is 8192)
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* @param int $length The length of the hash (optional, default is 32)
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* @return string
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*/
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public function pbkdf2($password, $salt, $algorithm = 'sha256', $iterations = 8192, $length = 24)
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{
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if(function_exists('hash_pbkdf2'))
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{
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return hash_pbkdf2($algorithm, $password, $salt, $iterations, $length, true);
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}
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else
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{
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$output = '';
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$block_count = ceil($length / strlen(hash($algorithm, '', true))); // key length divided by the length of one hash
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for($i = 1; $i <= $block_count; $i++)
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{
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$last = $salt . pack('N', $i); // $i encoded as 4 bytes, big endian
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$last = $xorsum = hash_hmac($algorithm, $last, $password, true); // first iteration
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for($j = 1; $j < $iterations; $j++) // The other $count - 1 iterations
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{
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$xorsum ^= ($last = hash_hmac($algorithm, $last, $password, true));
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}
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$output .= $xorsum;
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}
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return substr($output, 0, $length);
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}
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$hash = Rhymix\Framework\Security::pbkdf2($password, $salt, $algorithm, $iterations, $length);
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$hash = explode(':', $hash);
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return base64_decode($hash[3]);
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}
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/**
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* @brief Generate the bcrypt hash of a string using a salt
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* @param string $password The password
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* @param string $salt The salt (optional, auto-generated if empty)
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* @return string
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*/
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public function bcrypt($password, $salt = null)
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{
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if($salt === null)
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{
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$salt = '$2y$'.sprintf('%02d', $this->getWorkFactor()).'$'.$this->createSecureSalt(22, 'alnum');
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}
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return crypt($password, $salt);
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return Rhymix\Framework\Security::bcrypt($password, $salt);
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}
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/**
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* @brief Compare two strings in constant time
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* @param string $a The first string
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* @param string $b The second string
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* @return bool
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*/
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function strcmpConstantTime($a, $b)
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{
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return Rhymix\Framework\Security::compareStrings($a, $b);
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