|
1
|
|
|
<?php |
|
2
|
|
|
/** |
|
3
|
|
|
* Encrypt PHP session data for the internal PHP save handlers |
|
4
|
|
|
* |
|
5
|
|
|
* The encryption is built using OpenSSL extension with AES-256-CBC and the |
|
6
|
|
|
* authentication is provided using HMAC with SHA256. |
|
7
|
|
|
* |
|
8
|
|
|
* @author Enrico Zimuel ([email protected]) |
|
9
|
|
|
* @copyright MIT License |
|
10
|
|
|
*/ |
|
11
|
|
|
namespace PHPSecureSession; |
|
12
|
|
|
|
|
13
|
|
|
use SessionHandler; |
|
14
|
|
|
|
|
15
|
|
|
class SecureHandler extends SessionHandler |
|
16
|
|
|
{ |
|
17
|
|
|
/** |
|
18
|
|
|
* Encryption and authentication key |
|
19
|
|
|
* @var string |
|
20
|
|
|
*/ |
|
21
|
|
|
protected $key; |
|
22
|
|
|
|
|
23
|
|
|
/** |
|
24
|
|
|
* Constructor |
|
25
|
|
|
*/ |
|
26
|
|
|
public function __construct() |
|
27
|
|
|
{ |
|
28
|
|
|
if (! extension_loaded('openssl')) { |
|
29
|
|
|
throw new \RuntimeException(sprintf( |
|
30
|
|
|
"You need the OpenSSL extension to use %s", |
|
31
|
|
|
__CLASS__ |
|
32
|
|
|
)); |
|
33
|
|
|
} |
|
34
|
|
|
if (! extension_loaded('mbstring')) { |
|
35
|
|
|
throw new \RuntimeException(sprintf( |
|
36
|
|
|
"You need the Multibytes extension to use %s", |
|
37
|
|
|
__CLASS__ |
|
38
|
|
|
)); |
|
39
|
|
|
} |
|
40
|
|
|
} |
|
41
|
|
|
|
|
42
|
|
|
/** |
|
43
|
|
|
* Open the session |
|
44
|
|
|
* |
|
45
|
|
|
* @param string $save_path |
|
46
|
|
|
* @param string $session_name |
|
47
|
|
|
*/ |
|
48
|
|
|
public function open($save_path, $session_name): bool |
|
49
|
|
|
{ |
|
50
|
|
|
$this->key = $this->getKey('KEY_' . $session_name); |
|
51
|
|
|
return parent::open($save_path, $session_name); |
|
52
|
|
|
} |
|
53
|
|
|
|
|
54
|
|
|
/** |
|
55
|
|
|
* Read from session and decrypt |
|
56
|
|
|
* |
|
57
|
|
|
* @param string $id |
|
58
|
|
|
*/ |
|
59
|
|
|
public function read($id): string |
|
60
|
|
|
{ |
|
61
|
|
|
$data = parent::read($id); |
|
62
|
|
|
return empty($data) ? '' : $this->decrypt($data, $this->key); |
|
63
|
|
|
} |
|
64
|
|
|
|
|
65
|
|
|
/** |
|
66
|
|
|
* Encrypt the data and write into the session |
|
67
|
|
|
* |
|
68
|
|
|
* @param string $id |
|
69
|
|
|
* @param string $data |
|
70
|
|
|
*/ |
|
71
|
|
|
public function write($id, $data): bool |
|
72
|
|
|
{ |
|
73
|
|
|
return parent::write($id, $this->encrypt($data, $this->key)); |
|
74
|
|
|
} |
|
75
|
|
|
|
|
76
|
|
|
/** |
|
77
|
|
|
* Encrypt and authenticate |
|
78
|
|
|
* |
|
79
|
|
|
* @param string $data |
|
80
|
|
|
* @param string $key |
|
81
|
|
|
* @return string |
|
82
|
|
|
*/ |
|
83
|
|
|
protected function encrypt($data, $key) |
|
84
|
|
|
{ |
|
85
|
|
|
$iv = random_bytes(16); // AES block size in CBC mode |
|
86
|
|
|
// Encryption |
|
87
|
|
|
$ciphertext = openssl_encrypt( |
|
88
|
|
|
$data, |
|
89
|
|
|
'AES-256-CBC', |
|
90
|
|
|
mb_substr($key, 0, 32, '8bit'), |
|
91
|
|
|
OPENSSL_RAW_DATA, |
|
92
|
|
|
$iv |
|
93
|
|
|
); |
|
94
|
|
|
// Authentication |
|
95
|
|
|
$hmac = hash_hmac( |
|
96
|
|
|
'SHA256', |
|
97
|
|
|
$iv . $ciphertext, |
|
98
|
|
|
mb_substr($key, 32, null, '8bit'), |
|
99
|
|
|
true |
|
100
|
|
|
); |
|
101
|
|
|
return $hmac . $iv . $ciphertext; |
|
102
|
|
|
} |
|
103
|
|
|
|
|
104
|
|
|
/** |
|
105
|
|
|
* Authenticate and decrypt |
|
106
|
|
|
* |
|
107
|
|
|
* @param string $data |
|
108
|
|
|
* @param string $key |
|
109
|
|
|
* @return string |
|
110
|
|
|
*/ |
|
111
|
|
|
protected function decrypt($data, $key) |
|
112
|
|
|
{ |
|
113
|
|
|
$hmac = mb_substr($data, 0, 32, '8bit'); |
|
114
|
|
|
$iv = mb_substr($data, 32, 16, '8bit'); |
|
115
|
|
|
$ciphertext = mb_substr($data, 48, null, '8bit'); |
|
116
|
|
|
// Authentication |
|
117
|
|
|
$hmacNew = hash_hmac( |
|
118
|
|
|
'SHA256', |
|
119
|
|
|
$iv . $ciphertext, |
|
120
|
|
|
mb_substr($key, 32, null, '8bit'), |
|
121
|
|
|
true |
|
122
|
|
|
); |
|
123
|
|
|
if (! hash_equals($hmac, $hmacNew)) { |
|
124
|
|
|
throw new Exception\AuthenticationFailedException('Authentication failed'); |
|
125
|
|
|
} |
|
126
|
|
|
// Decrypt |
|
127
|
|
|
return openssl_decrypt( |
|
128
|
|
|
$ciphertext, |
|
129
|
|
|
'AES-256-CBC', |
|
130
|
|
|
mb_substr($key, 0, 32, '8bit'), |
|
131
|
|
|
OPENSSL_RAW_DATA, |
|
132
|
|
|
$iv |
|
133
|
|
|
); |
|
134
|
|
|
} |
|
135
|
|
|
|
|
136
|
|
|
/** |
|
137
|
|
|
* Get the encryption and authentication keys from cookie |
|
138
|
|
|
* |
|
139
|
|
|
* @param string $name |
|
140
|
|
|
* @return string |
|
141
|
|
|
*/ |
|
142
|
|
|
protected function getKey($name) |
|
143
|
|
|
{ |
|
144
|
|
|
if (empty($_COOKIE[$name])) { |
|
145
|
|
|
$key = random_bytes(64); // 32 for encryption and 32 for authentication |
|
146
|
|
|
$cookieParam = session_get_cookie_params(); |
|
147
|
|
|
$encKey = base64_encode($key); |
|
148
|
|
|
// if session cookie lifetime > 0 then add to current time |
|
149
|
|
|
// otherwise leave it as zero, honoring zero's special meaning |
|
150
|
|
|
// expire at browser close. |
|
151
|
|
|
$arr_cookie_options = array ( |
|
152
|
|
|
'expires' => ($cookieParam['lifetime'] > 0) ? time() + $cookieParam['lifetime'] : 0, |
|
153
|
|
|
'path' => '/', |
|
154
|
|
|
'secure' => true, |
|
155
|
|
|
'httponly' => true, |
|
156
|
|
|
'samesite' => 'Lax' // None || Lax || Strict |
|
157
|
|
|
); |
|
158
|
|
|
setcookie($name, $encKey, $arr_cookie_options); |
|
159
|
|
|
$_COOKIE[$name] = $encKey; |
|
160
|
|
|
} else { |
|
161
|
|
|
$key = base64_decode($_COOKIE[$name]); |
|
162
|
|
|
} |
|
163
|
|
|
return $key; |
|
164
|
|
|
} |
|
165
|
|
|
} |
nilsteampassnet /
TeamPass
