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https://github.com/kamilwylegala/cakephp2-php8.git
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974ac44fb4
Using fixed iv values has a number of known problems like dictionary attacks against the cipher key. Use a random iv value for all future encrpyted values. Provide backwards compatibility for values encrypted with fixed iv's, and silently upgrade values for enhanced security.
284 lines
7.9 KiB
PHP
284 lines
7.9 KiB
PHP
<?php
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/**
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* Core Security
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*
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* PHP 5
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*
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* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
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* Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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*
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* Licensed under The MIT License
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* For full copyright and license information, please see the LICENSE.txt
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* Redistributions of files must retain the above copyright notice.
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*
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* @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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* @link http://cakephp.org CakePHP(tm) Project
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* @package Cake.Utility
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* @since CakePHP(tm) v .0.10.0.1233
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* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
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*/
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App::uses('String', 'Utility');
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/**
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* Security Library contains utility methods related to security
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*
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* @package Cake.Utility
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*/
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class Security {
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/**
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* Default hash method
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*
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* @var string
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*/
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public static $hashType = null;
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/**
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* Default cost
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*
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* @var string
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*/
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public static $hashCost = '10';
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/**
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* Get allowed minutes of inactivity based on security level.
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*
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* @deprecated Exists for backwards compatibility only, not used by the core
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* @return integer Allowed inactivity in minutes
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*/
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public static function inactiveMins() {
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switch (Configure::read('Security.level')) {
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case 'high':
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return 10;
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case 'medium':
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return 100;
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case 'low':
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default:
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return 300;
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}
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}
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/**
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* Generate authorization hash.
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*
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* @return string Hash
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*/
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public static function generateAuthKey() {
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return Security::hash(String::uuid());
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}
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/**
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* Validate authorization hash.
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*
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* @param string $authKey Authorization hash
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* @return boolean Success
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*/
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public static function validateAuthKey($authKey) {
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return true;
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}
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/**
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* Create a hash from string using given method or fallback on next available method.
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*
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* #### Using Blowfish
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*
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* - Creating Hashes: *Do not supply a salt*. Cake handles salt creation for
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* you ensuring that each hashed password will have a *unique* salt.
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* - Comparing Hashes: Simply pass the originally hashed password as the salt.
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* The salt is prepended to the hash and php handles the parsing automagically.
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* For convenience the BlowfishAuthenticate adapter is available for use with
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* the AuthComponent.
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* - Do NOT use a constant salt for blowfish!
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*
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* Creating a blowfish/bcrypt hash:
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*
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* {{{
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* $hash = Security::hash($password, 'blowfish');
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* }}}
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*
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* @param string $string String to hash
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* @param string $type Method to use (sha1/sha256/md5/blowfish)
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* @param mixed $salt If true, automatically appends the application's salt
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* value to $string (Security.salt). If you are using blowfish the salt
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* must be false or a previously generated salt.
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* @return string Hash
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*/
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public static function hash($string, $type = null, $salt = false) {
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if (empty($type)) {
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$type = self::$hashType;
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}
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$type = strtolower($type);
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if ($type === 'blowfish') {
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return self::_crypt($string, $salt);
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}
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if ($salt) {
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if (!is_string($salt)) {
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$salt = Configure::read('Security.salt');
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}
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$string = $salt . $string;
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}
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if (!$type || $type == 'sha1') {
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if (function_exists('sha1')) {
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return sha1($string);
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}
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$type = 'sha256';
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}
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if ($type == 'sha256' && function_exists('mhash')) {
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return bin2hex(mhash(MHASH_SHA256, $string));
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}
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if (function_exists('hash')) {
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return hash($type, $string);
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}
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return md5($string);
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}
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/**
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* Sets the default hash method for the Security object. This affects all objects using
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* Security::hash().
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*
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* @param string $hash Method to use (sha1/sha256/md5/blowfish)
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* @return void
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* @see Security::hash()
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*/
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public static function setHash($hash) {
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self::$hashType = $hash;
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}
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/**
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* Sets the cost for they blowfish hash method.
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*
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* @param integer $cost Valid values are 4-31
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* @return void
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*/
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public static function setCost($cost) {
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if ($cost < 4 || $cost > 31) {
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trigger_error(__d(
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'cake_dev',
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'Invalid value, cost must be between %s and %s',
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array(4, 31)
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), E_USER_WARNING);
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return null;
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}
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self::$hashCost = $cost;
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}
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/**
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* Encrypts/Decrypts a text using the given key.
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*
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* @param string $text Encrypted string to decrypt, normal string to encrypt
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* @param string $key Key to use
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* @return string Encrypted/Decrypted string
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*/
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public static function cipher($text, $key) {
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if (empty($key)) {
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trigger_error(__d('cake_dev', 'You cannot use an empty key for Security::cipher()'), E_USER_WARNING);
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return '';
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}
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srand(Configure::read('Security.cipherSeed'));
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$out = '';
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$keyLength = strlen($key);
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for ($i = 0, $textLength = strlen($text); $i < $textLength; $i++) {
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$j = ord(substr($key, $i % $keyLength, 1));
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while ($j--) {
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rand(0, 255);
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}
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$mask = rand(0, 255);
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$out .= chr(ord(substr($text, $i, 1)) ^ $mask);
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}
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srand();
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return $out;
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}
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/**
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* Encrypts/Decrypts a text using the given key using rijndael method.
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*
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* Prior to 2.3.1, a fixed initialization vector was used. This was not
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* secure. This method now uses a random iv, and will silently upgrade values when
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* they are re-encrypted.
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*
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* @param string $text Encrypted string to decrypt, normal string to encrypt
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* @param string $key Key to use as the encryption key for encrypted data.
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* @param string $operation Operation to perform, encrypt or decrypt
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* @return string Encrypted/Descrypted string
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*/
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public static function rijndael($text, $key, $operation) {
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if (empty($key)) {
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trigger_error(__d('cake_dev', 'You cannot use an empty key for Security::rijndael()'), E_USER_WARNING);
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return '';
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}
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if (empty($operation) || !in_array($operation, array('encrypt', 'decrypt'))) {
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trigger_error(__d('cake_dev', 'You must specify the operation for Security::rijndael(), either encrypt or decrypt'), E_USER_WARNING);
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return '';
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}
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if (strlen($key) < 32) {
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trigger_error(__d('cake_dev', 'You must use a key larger than 32 bytes for Security::rijndael()'), E_USER_WARNING);
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return '';
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}
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$algorithm = MCRYPT_RIJNDAEL_256;
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$mode = MCRYPT_MODE_CBC;
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$ivSize = mcrypt_get_iv_size($algorithm, $mode);
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$cryptKey = substr($key, 0, 32);
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if ($operation === 'encrypt') {
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$iv = mcrypt_create_iv($ivSize, MCRYPT_RAND);
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return $iv . '$$' . mcrypt_encrypt($algorithm, $cryptKey, $text, $mode, $iv);
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}
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// Backwards compatible decrypt with fixed iv
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if (substr($text, $ivSize, 2) !== '$$') {
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$iv = substr($key, strlen($key) - 32, 32);
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return rtrim(mcrypt_decrypt($algorithm, $cryptKey, $text, $mode, $iv), "\0");
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}
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$iv = substr($text, 0, $ivSize);
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$text = substr($text, $ivSize + 2);
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return rtrim(mcrypt_decrypt($algorithm, $cryptKey, $text, $mode, $iv), "\0");
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}
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/**
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* Generates a pseudo random salt suitable for use with php's crypt() function.
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* The salt length should not exceed 27. The salt will be composed of
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* [./0-9A-Za-z]{$length}.
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*
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* @param integer $length The length of the returned salt
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* @return string The generated salt
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*/
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protected static function _salt($length = 22) {
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$salt = str_replace(
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array('+', '='),
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'.',
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base64_encode(sha1(uniqid(Configure::read('Security.salt'), true), true))
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);
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return substr($salt, 0, $length);
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}
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/**
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* One way encryption using php's crypt() function. To use blowfish hashing see ``Security::hash()``
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*
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* @param string $password The string to be encrypted.
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* @param mixed $salt false to generate a new salt or an existing salt.
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* @return string The hashed string or an empty string on error.
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*/
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protected static function _crypt($password, $salt = false) {
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if ($salt === false) {
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$salt = self::_salt(22);
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$salt = vsprintf('$2a$%02d$%s', array(self::$hashCost, $salt));
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}
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if ($salt === true || strpos($salt, '$2a$') !== 0 || strlen($salt) < 29) {
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trigger_error(__d(
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'cake_dev',
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'Invalid salt: %s for %s Please visit http://www.php.net/crypt and read the appropriate section for building %s salts.',
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array($salt, 'blowfish', 'blowfish')
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), E_USER_WARNING);
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return '';
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}
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return crypt($password, $salt);
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}
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}
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