251 行
7.4 KiB
PHP
251 行
7.4 KiB
PHP
<?php
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP
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*
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* This content is released under the MIT License (MIT)
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*
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* Copyright (c) 2014 - 2019, British Columbia Institute of Technology
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* @package CodeIgniter
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* @author EllisLab Dev Team
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* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
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* @copyright Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
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* @license https://opensource.org/licenses/MIT MIT License
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* @link https://codeigniter.com
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* @since Version 3.0.0
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* @filesource
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*/
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defined('BASEPATH') OR exit('No direct script access allowed');
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/**
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* PHP ext/standard/password compatibility package
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*
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* @package CodeIgniter
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* @subpackage CodeIgniter
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* @category Compatibility
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* @author Andrey Andreev
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* @link https://codeigniter.com/userguide3/
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* @link https://secure.php.net/password
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*/
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// ------------------------------------------------------------------------
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if (is_php('5.5') OR ! defined('CRYPT_BLOWFISH') OR CRYPT_BLOWFISH !== 1 OR defined('HHVM_VERSION'))
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{
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return;
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}
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// ------------------------------------------------------------------------
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defined('PASSWORD_BCRYPT') OR define('PASSWORD_BCRYPT', 1);
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defined('PASSWORD_DEFAULT') OR define('PASSWORD_DEFAULT', PASSWORD_BCRYPT);
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// ------------------------------------------------------------------------
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if ( ! function_exists('password_get_info'))
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{
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/**
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* password_get_info()
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*
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* @link https://secure.php.net/password_get_info
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* @param string $hash
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* @return array
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*/
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function password_get_info($hash)
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{
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return (strlen($hash) < 60 OR sscanf($hash, '$2y$%d', $hash) !== 1)
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? array('algo' => 0, 'algoName' => 'unknown', 'options' => array())
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: array('algo' => 1, 'algoName' => 'bcrypt', 'options' => array('cost' => $hash));
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}
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}
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// ------------------------------------------------------------------------
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if ( ! function_exists('password_hash'))
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{
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/**
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* password_hash()
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*
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* @link https://secure.php.net/password_hash
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* @param string $password
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* @param int $algo
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* @param array $options
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* @return mixed
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*/
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function password_hash($password, $algo, array $options = array())
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{
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static $func_overload;
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isset($func_overload) OR $func_overload = (extension_loaded('mbstring') && ini_get('mbstring.func_overload'));
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if ($algo !== 1)
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{
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trigger_error('password_hash(): Unknown hashing algorithm: '.(int) $algo, E_USER_WARNING);
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return NULL;
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}
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if (isset($options['cost']) && ($options['cost'] < 4 OR $options['cost'] > 31))
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{
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trigger_error('password_hash(): Invalid bcrypt cost parameter specified: '.(int) $options['cost'], E_USER_WARNING);
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return NULL;
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}
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if (isset($options['salt']) && ($saltlen = ($func_overload ? mb_strlen($options['salt'], '8bit') : strlen($options['salt']))) < 22)
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{
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trigger_error('password_hash(): Provided salt is too short: '.$saltlen.' expecting 22', E_USER_WARNING);
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return NULL;
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}
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elseif ( ! isset($options['salt']))
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{
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if (function_exists('random_bytes'))
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{
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try
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{
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$options['salt'] = random_bytes(16);
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}
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catch (Exception $e)
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{
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log_message('error', 'compat/password: Error while trying to use random_bytes(): '.$e->getMessage());
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return FALSE;
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}
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}
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elseif (defined('MCRYPT_DEV_URANDOM'))
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{
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$options['salt'] = mcrypt_create_iv(16, MCRYPT_DEV_URANDOM);
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}
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elseif (DIRECTORY_SEPARATOR === '/' && (is_readable($dev = '/dev/arandom') OR is_readable($dev = '/dev/urandom')))
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{
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if (($fp = fopen($dev, 'rb')) === FALSE)
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{
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log_message('error', 'compat/password: Unable to open '.$dev.' for reading.');
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return FALSE;
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}
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// Try not to waste entropy ...
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stream_set_chunk_size($fp, 16);
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$options['salt'] = '';
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for ($read = 0; $read < 16; $read = ($func_overload) ? mb_strlen($options['salt'], '8bit') : strlen($options['salt']))
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{
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if (($read = fread($fp, 16 - $read)) === FALSE)
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{
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log_message('error', 'compat/password: Error while reading from '.$dev.'.');
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return FALSE;
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}
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$options['salt'] .= $read;
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}
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fclose($fp);
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}
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elseif (function_exists('openssl_random_pseudo_bytes'))
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{
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$is_secure = NULL;
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$options['salt'] = openssl_random_pseudo_bytes(16, $is_secure);
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if ($is_secure !== TRUE)
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{
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log_message('error', 'compat/password: openssl_random_pseudo_bytes() set the $cryto_strong flag to FALSE');
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return FALSE;
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}
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}
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else
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{
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log_message('error', 'compat/password: No CSPRNG available.');
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return FALSE;
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}
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$options['salt'] = str_replace('+', '.', rtrim(base64_encode($options['salt']), '='));
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}
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elseif ( ! preg_match('#^[a-zA-Z0-9./]+$#D', $options['salt']))
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{
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$options['salt'] = str_replace('+', '.', rtrim(base64_encode($options['salt']), '='));
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}
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isset($options['cost']) OR $options['cost'] = 10;
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return (strlen($password = crypt($password, sprintf('$2y$%02d$%s', $options['cost'], $options['salt']))) === 60)
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? $password
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: FALSE;
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}
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}
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// ------------------------------------------------------------------------
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if ( ! function_exists('password_needs_rehash'))
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{
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/**
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* password_needs_rehash()
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*
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* @link https://secure.php.net/password_needs_rehash
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* @param string $hash
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* @param int $algo
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* @param array $options
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* @return bool
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*/
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function password_needs_rehash($hash, $algo, array $options = array())
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{
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$info = password_get_info($hash);
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if ($algo !== $info['algo'])
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{
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return TRUE;
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}
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elseif ($algo === 1)
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{
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$options['cost'] = isset($options['cost']) ? (int) $options['cost'] : 10;
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return ($info['options']['cost'] !== $options['cost']);
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}
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// Odd at first glance, but according to a comment in PHP's own unit tests,
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// because it is an unknown algorithm - it's valid and therefore doesn't
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// need rehashing.
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return FALSE;
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}
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}
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// ------------------------------------------------------------------------
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if ( ! function_exists('password_verify'))
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{
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/**
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* password_verify()
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*
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* @link https://secure.php.net/password_verify
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* @param string $password
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* @param string $hash
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* @return bool
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*/
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function password_verify($password, $hash)
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{
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if (strlen($hash) !== 60 OR strlen($password = crypt($password, $hash)) !== 60)
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{
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return FALSE;
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}
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$compare = 0;
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for ($i = 0; $i < 60; $i++)
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{
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$compare |= (ord($password[$i]) ^ ord($hash[$i]));
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}
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return ($compare === 0);
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}
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}
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