1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
|
<?php
/**
* Core Security
*
* PHP 5
*
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright 2005-2012, Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright 2005-2012, Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @package Cake.Utility
* @since CakePHP(tm) v .0.10.0.1233
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/
App::uses('String', 'Utility');
/**
* Security Library contains utility methods related to security
*
* @package Cake.Utility
*/
class Security {
/**
* Default hash method
*
* @var string
*/
public static $hashType = null;
/**
* Get allowed minutes of inactivity based on security level.
*
* @return integer Allowed inactivity in minutes
*/
public static function inactiveMins() {
switch (Configure::read('Security.level')) {
case 'high':
return 10;
break;
case 'medium':
return 100;
break;
case 'low':
default:
return 300;
break;
}
}
/**
* Generate authorization hash.
*
* @return string Hash
*/
public static function generateAuthKey() {
return Security::hash(String::uuid());
}
/**
* Validate authorization hash.
*
* @param string $authKey Authorization hash
* @return boolean Success
* @todo Complete implementation
*/
public static function validateAuthKey($authKey) {
return true;
}
/**
* Create a hash from string using given method.
* Fallback on next available method.
*
* @param string $string String to hash
* @param string $type Method to use (sha1/sha256/md5)
* @param boolean $salt If true, automatically appends the application's salt
* value to $string (Security.salt)
* @return string Hash
*/
public static function hash($string, $type = null, $salt = false) {
if ($salt) {
if (is_string($salt)) {
$string = $salt . $string;
} else {
$string = Configure::read('Security.salt') . $string;
}
}
if (empty($type)) {
$type = self::$hashType;
}
$type = strtolower($type);
if ($type == 'sha1' || $type == null) {
if (function_exists('sha1')) {
$return = sha1($string);
return $return;
}
$type = 'sha256';
}
if ($type == 'sha256' && function_exists('mhash')) {
return bin2hex(mhash(MHASH_SHA256, $string));
}
if (function_exists('hash')) {
return hash($type, $string);
}
return md5($string);
}
/**
* Sets the default hash method for the Security object. This affects all objects using
* Security::hash().
*
* @param string $hash Method to use (sha1/sha256/md5)
* @return void
* @see Security::hash()
*/
public static function setHash($hash) {
self::$hashType = $hash;
}
/**
* Encrypts/Decrypts a text using the given key.
*
* @param string $text Encrypted string to decrypt, normal string to encrypt
* @param string $key Key to use
* @return string Encrypted/Decrypted string
*/
public static function cipher($text, $key) {
if (empty($key)) {
trigger_error(__d('cake_dev', 'You cannot use an empty key for Security::cipher()'), E_USER_WARNING);
return '';
}
srand(Configure::read('Security.cipherSeed'));
$out = '';
$keyLength = strlen($key);
for ($i = 0, $textLength = strlen($text); $i < $textLength; $i++) {
$j = ord(substr($key, $i % $keyLength, 1));
while ($j--) {
rand(0, 255);
}
$mask = rand(0, 255);
$out .= chr(ord(substr($text, $i, 1)) ^ $mask);
}
srand();
return $out;
}
/**
* Encrypts/Decrypts a text using the given key using rijndael method.
*
* @param string $text Encrypted string to decrypt, normal string to encrypt
* @param string $key Key to use
* @param string $operation Operation to perform, encrypt or decrypt
* @return string Encrypted/Descrypted string
*/
public static function rijndael($text, $key, $operation) {
if (empty($key)) {
trigger_error(__d('cake_dev', 'You cannot use an empty key for Security::rijndael()'), E_USER_WARNING);
return '';
}
if (empty($operation) || !in_array($operation, array('encrypt', 'decrypt'))) {
trigger_error(__d('cake_dev', 'You must specify the operation for Security::rijndael(), either encrypt or decrypt'), E_USER_WARNING);
return '';
}
if (strlen($key) < 32) {
trigger_error(__d('cake_dev', 'You must use a key larger than 32 bytes for Security::rijndael()'), E_USER_WARNING);
return '';
}
$algorithm = 'rijndael-256';
$mode = 'cbc';
$cryptKey = substr($key, 0, 32);
$iv = substr($key, strlen($key) - 32, 32);
$out = '';
if ($operation === 'encrypt') {
$out .= mcrypt_encrypt($algorithm, $cryptKey, $text, $mode, $iv);
} elseif ($operation === 'decrypt') {
$out .= rtrim(mcrypt_decrypt($algorithm, $cryptKey, $text, $mode, $iv), "\0");
}
return $out;
}
}
|
