|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
namespace Del; |
|
4
|
|
|
|
|
5
|
|
|
final class SessionManager |
|
6
|
|
|
{ |
|
7
|
|
|
/** |
|
8
|
|
|
* As this is a singleton, construction and clone are disabled |
|
9
|
|
|
* use SessionManager::getInstance() if you need the instance |
|
10
|
|
|
*/ |
|
11
|
|
|
private function __construct(){} |
|
12
|
|
|
|
|
13
|
|
|
private function __clone(){} |
|
14
|
|
|
|
|
15
|
|
|
/** |
|
16
|
|
|
* @return SessionManager|null |
|
17
|
|
|
*/ |
|
18
|
|
|
public static function getInstance() |
|
19
|
|
|
{ |
|
20
|
|
|
static $inst = null; |
|
21
|
|
|
if ($inst === null) { |
|
22
|
|
|
$inst = new SessionManager(); |
|
23
|
|
|
} |
|
24
|
|
|
return $inst; |
|
25
|
|
|
} |
|
26
|
|
|
|
|
27
|
|
|
/** |
|
28
|
|
|
* Creates a secure session |
|
29
|
|
|
* @param $name |
|
30
|
|
|
* @param int $lifetime |
|
31
|
|
|
* @param string $path |
|
32
|
|
|
* @param null $domain |
|
33
|
|
|
* @param null $secure |
|
34
|
|
|
*/ |
|
35
|
|
|
public static function sessionStart($name, $lifetime = 0, $path = '/', $domain = null, $secure = null) |
|
36
|
|
|
{ |
|
37
|
|
|
// Set the cookie name before we start. |
|
38
|
|
|
session_name($name . '_Session'); |
|
39
|
|
|
|
|
40
|
|
|
// Set the domain to default to the current domain. |
|
41
|
|
|
$domain = isset($domain) ? $domain : $_SERVER['SERVER_NAME']; |
|
42
|
|
|
|
|
43
|
|
|
// Set the default secure value to whether the site is being accessed with SSL |
|
44
|
|
|
$secure = isset($secure) ? $secure : isset($_SERVER['HTTPS']); |
|
45
|
|
|
|
|
46
|
|
|
// Set the cookie settings and start the session |
|
47
|
|
|
session_set_cookie_params($lifetime, $path, $domain, $secure, true); |
|
48
|
|
|
|
|
49
|
|
|
$id = session_id(); |
|
50
|
|
|
if(empty($id)) { |
|
51
|
|
|
session_start(); |
|
52
|
|
|
} |
|
53
|
|
|
|
|
54
|
|
|
// Make sure the session hasn't expired, and destroy it if it has |
|
55
|
|
|
if (self::validateSession()) { |
|
56
|
|
|
|
|
57
|
|
|
// Check to see if the session is new or a hijacking attempt |
|
58
|
|
|
if (!self::preventHijacking()) { |
|
59
|
|
|
|
|
60
|
|
|
// Reset session data and regenerate id |
|
61
|
|
|
$_SESSION = array(); |
|
62
|
|
|
$_SESSION['ipAddress'] = $_SERVER['REMOTE_ADDR']; |
|
63
|
|
|
$_SESSION['userAgent'] = $_SERVER['HTTP_USER_AGENT']; |
|
64
|
|
|
self::regenerateSession(); |
|
65
|
|
|
|
|
66
|
|
|
// Give a 5% chance of the session id changing on any request |
|
67
|
|
|
} elseif (self::shouldRandomlyRegenerate()) { |
|
68
|
|
|
self::regenerateSession(); |
|
69
|
|
|
} |
|
70
|
|
|
} else { |
|
71
|
|
|
self::destroySession(); |
|
72
|
|
|
} |
|
73
|
|
|
} |
|
74
|
|
|
|
|
75
|
|
|
private function shouldRandomlyRegenerate() |
|
76
|
|
|
{ |
|
77
|
|
|
return rand(1, 100) <= 5; |
|
78
|
|
|
} |
|
79
|
|
|
|
|
80
|
|
|
|
|
81
|
|
|
/** |
|
82
|
|
|
* Checks session IP and user agent are still the same |
|
83
|
|
|
* @return bool |
|
84
|
|
|
*/ |
|
85
|
|
|
private static function preventHijacking() |
|
86
|
|
|
{ |
|
87
|
|
|
if (!isset($_SESSION['ipAddress']) || !isset($_SESSION['userAgent'])) { |
|
88
|
|
|
return false; |
|
89
|
|
|
} |
|
90
|
|
|
if ($_SESSION['ipAddress'] != $_SERVER['REMOTE_ADDR']) { |
|
91
|
|
|
return false; |
|
92
|
|
|
} |
|
93
|
|
|
if ($_SESSION['userAgent'] != $_SERVER['HTTP_USER_AGENT']) { |
|
94
|
|
|
return false; |
|
95
|
|
|
} |
|
96
|
|
|
return true; |
|
97
|
|
|
} |
|
98
|
|
|
|
|
99
|
|
|
/** |
|
100
|
|
|
* Creates a fresh session Id to make it harder to hack |
|
101
|
|
|
* If the site is very slow in parts increase the expiry time |
|
102
|
|
|
* 10 seconds is a good default which allows ajax calls to work |
|
103
|
|
|
* without losing the session |
|
104
|
|
|
*/ |
|
105
|
|
|
private static function regenerateSession() |
|
106
|
|
|
{ |
|
107
|
|
|
// If this session is obsolete it means there already is a new id |
|
108
|
|
|
if (isset($_SESSION['OBSOLETE']) && $_SESSION['OBSOLETE'] == true) { |
|
109
|
|
|
return; |
|
110
|
|
|
} |
|
111
|
|
|
|
|
112
|
|
|
// Set current session to expire in 10 seconds |
|
113
|
|
|
$_SESSION['OBSOLETE'] = true; |
|
114
|
|
|
$_SESSION['EXPIRES'] = time() + 10; |
|
115
|
|
|
|
|
116
|
|
|
// Create new session without destroying the old one |
|
117
|
|
|
session_regenerate_id(false); |
|
118
|
|
|
|
|
119
|
|
|
// Grab current session ID and close both sessions to allow other scripts to use them |
|
120
|
|
|
$newSession = session_id(); |
|
121
|
|
|
session_write_close(); |
|
122
|
|
|
|
|
123
|
|
|
// Set session ID to the new one, and start it back up again |
|
124
|
|
|
session_id($newSession); |
|
125
|
|
|
session_start(); |
|
126
|
|
|
|
|
127
|
|
|
// Now we unset the obsolete and expiration values for the session we want to keep |
|
128
|
|
|
unset($_SESSION['OBSOLETE']); |
|
129
|
|
|
unset($_SESSION['EXPIRES']); |
|
130
|
|
|
} |
|
131
|
|
|
|
|
132
|
|
|
/** |
|
133
|
|
|
* Checks whether the session has expired or not |
|
134
|
|
|
* @return bool |
|
135
|
|
|
*/ |
|
136
|
|
|
private static function validateSession() |
|
137
|
|
|
{ |
|
138
|
|
|
if (isset($_SESSION['OBSOLETE']) && !isset($_SESSION['EXPIRES'])) { |
|
139
|
|
|
return false; |
|
140
|
|
|
} |
|
141
|
|
|
|
|
142
|
|
|
if (isset($_SESSION['EXPIRES']) && $_SESSION['EXPIRES'] < time()) { |
|
143
|
|
|
return false; |
|
144
|
|
|
} |
|
145
|
|
|
|
|
146
|
|
|
return true; |
|
147
|
|
|
} |
|
148
|
|
|
|
|
149
|
|
|
/** |
|
150
|
|
|
* Resets the session |
|
151
|
|
|
*/ |
|
152
|
|
|
public static function destroySession() |
|
153
|
|
|
{ |
|
154
|
|
|
$id = session_id(); |
|
155
|
|
|
if(!empty($id)) { |
|
156
|
|
|
$_SESSION = array(); |
|
157
|
|
|
session_destroy(); |
|
158
|
|
|
session_start(); |
|
159
|
|
|
} |
|
160
|
|
|
} |
|
161
|
|
|
|
|
162
|
|
|
/** |
|
163
|
|
|
* @param $key |
|
164
|
|
|
* @param $val |
|
165
|
|
|
*/ |
|
166
|
|
|
public static function set($key, $val) |
|
167
|
|
|
{ |
|
168
|
|
|
$_SESSION[$key] = $val; |
|
169
|
|
|
} |
|
170
|
|
|
|
|
171
|
|
|
/** |
|
172
|
|
|
* @param $key |
|
173
|
|
|
* @return null |
|
174
|
|
|
*/ |
|
175
|
|
|
public static function get($key) |
|
176
|
|
|
{ |
|
177
|
|
|
return isset($_SESSION[$key]) ? $_SESSION[$key] : null; |
|
178
|
|
|
} |
|
179
|
|
|
|
|
180
|
|
|
/** |
|
181
|
|
|
* @param $key |
|
182
|
|
|
* @param $val |
|
183
|
|
|
*/ |
|
184
|
|
|
public static function destroy($key) |
|
185
|
|
|
{ |
|
186
|
|
|
unset($_SESSION[$key]); |
|
187
|
|
|
} |
|
188
|
|
|
} |
delboy1978uk /
session
