191 lines
4.1 KiB
PHP
191 lines
4.1 KiB
PHP
<?php
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/**
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* Core Security
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*
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* PHP versions 4 and 5
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*
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* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
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* Copyright 2005-2010, 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 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
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* @link http://cakephp.org CakePHP(tm) Project
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* @package cake
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* @subpackage cake.cake.libs
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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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/**
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* Security Library contains utility methods related to security
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*
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* @package cake
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* @subpackage cake.cake.libs
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*/
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class Security extends Object {
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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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* @access public
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*/
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var $hashType = null;
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/**
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* Singleton implementation to get object instance.
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*
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* @return object
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* @access public
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* @static
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*/
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function &getInstance() {
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static $instance = array();
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if (!$instance) {
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$instance[0] =& new Security;
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}
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return $instance[0];
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}
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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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* @access public
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* @static
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*/
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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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* @access public
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* @static
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*/
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function generateAuthKey() {
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if (!class_exists('String')) {
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App::import('Core', 'String');
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}
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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 $authKey Authorization hash
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* @return boolean Success
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* @access public
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* @static
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* @todo Complete implementation
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*/
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function validateAuthKey($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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*
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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 boolean $salt If true, automatically appends the application's salt
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* value to $string (Security.salt)
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* @return string Hash
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* @access public
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* @static
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*/
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function hash($string, $type = null, $salt = false) {
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$_this =& Security::getInstance();
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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') . $string;
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}
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}
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if (empty($type)) {
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$type = $_this->hashType;
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}
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$type = strtolower($type);
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if ($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 $hash Method to use (sha1/sha256/md5)
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* @access public
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* @return void
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* @static
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* @see Security::hash()
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*/
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function setHash($hash) {
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$_this =& Security::getInstance();
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$_this->hashType = $hash;
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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 $key Key to use
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* @return string Encrypted/Decrypted string
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* @access public
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* @static
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*/
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function cipher($text, $key) {
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if (empty($key)) {
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trigger_error(__('You cannot use an empty key for Security::cipher()', true), 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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