mirror of
https://github.com/kamilwylegala/cakephp2-php8.git
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287 lines
7.6 KiB
PHP
287 lines
7.6 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 2005-2012, Cake Software Foundation, Inc. (http://cakefoundation.org)
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*
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* Licensed under The MIT License
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* Redistributions of files must retain the above copyright notice.
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*
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* @copyright Copyright 2005-2012, 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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* @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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break;
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case 'medium':
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return 100;
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break;
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case 'low':
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default:
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return 300;
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break;
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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 $authKey Authorization hash
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* @return boolean Success
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* @todo Complete implementation
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*/
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public static function validateAuthKey($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.
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* Fallback on next available method.
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* If you are using blowfish, for comparisons simply pass the originally hashed
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* string as the salt (the salt is prepended to the hash and php handles the
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* parsing automagically. Do NOT use a constant salt for blowfish.
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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)
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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, $type, $salt);
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}
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if ($salt) {
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if (is_string($salt)) {
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$string = $salt . $string;
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} else {
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$string = Configure::read('Security.salt') . $string;
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}
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}
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if ($type == 'sha1' || $type == null) {
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if (function_exists('sha1')) {
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$return = sha1($string);
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return $return;
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}
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$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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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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* @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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* @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 = 'rijndael-256';
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$mode = 'cbc';
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$cryptKey = substr($key, 0, 32);
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$iv = substr($key, strlen($key) - 32, 32);
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$out = '';
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if ($operation === 'encrypt') {
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$out .= mcrypt_encrypt($algorithm, $cryptKey, $text, $mode, $iv);
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} elseif ($operation === 'decrypt') {
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$out .= rtrim(mcrypt_decrypt($algorithm, $cryptKey, $text, $mode, $iv), "\0");
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}
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return $out;
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}
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/**
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* Generates a pseudo random salt suitable for use with php's crypt() function.
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* The salt length should not exceed 27. The salt will be composed of
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* [./0-9A-Za-z]{$length}.
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*
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* @param integer $length The length of the returned salt
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* @return string The generated salt
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*/
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public static function salt($length = 22) {
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return substr(str_replace('+', '.', base64_encode(sha1(uniqid(Configure::read('Security.salt'), true), true))), 0, $length);
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}
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/**
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* One way encryption using php's crypt() function.
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*
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* @param string $password The string to be encrypted.
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* @param string $type The encryption method to use (blowfish)
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* @param mixed $salt false to generate a new salt or an existing salt.
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*/
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protected static function _crypt($password, $type = null, $salt = false) {
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$options = array(
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'saltFormat' => array(
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'blowfish' => '$2a$%s$%s',
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),
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'saltLength' => array(
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'blowfish' => 22,
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),
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'costLimits' => array(
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'blowfish' => array(4, 31),
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)
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);
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extract($options);
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if ($type === null) {
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$hashType = self::$hashType;
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} else {
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$hashType = $type;
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}
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$cost = self::$hashCost;
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if ($salt === false) {
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if (isset($costLimits[$hashType]) && ($cost < $costLimits[$hashType][0] || $cost > $costLimits[$hashType][1])) {
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trigger_error(__d(
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'cake_dev',
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'When using %s you must specify a cost between %s and %s',
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array(
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$hashType,
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$costLimits[$hashType][0],
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$costLimits[$hashType][1]
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)
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), E_USER_WARNING);
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return '';
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}
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$vspArgs = array();
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$salt = self::salt($saltLength[$hashType]);
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if ($hashType === 'blowfish') {
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$bfCost = chr(ord('0') + $cost / 10);
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$bfCost .= chr(ord('0') + $cost % 10);
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$vspArgs[] = $bfCost;
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}
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$vspArgs[] = $salt;
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$salt = vsprintf($saltFormat[$hashType], $vspArgs);
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} elseif ($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, $hashType, $hashType)
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), E_USER_WARNING);
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return '';
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}
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return crypt($password, $salt);
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}
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}
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