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
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
|
<?php
namespace Zotlabs\Web;
/**
*
* @brief This file includes session related functions.
*
* Session management functions. These provide database storage of PHP
* session info.
*/
use Zotlabs\Lib\Config;
class Session {
private $handler = null;
private $session_started = false;
private $custom_handler = false;
public function init() {
$gc_probability = 50;
ini_set('session.gc_probability', $gc_probability);
ini_set('session.use_only_cookies', 1);
ini_set('session.cookie_httponly', 1);
$this->custom_handler = boolval(Config::Get('system', 'session_custom', false));
/*
* Set our session storage functions.
*/
if($this->custom_handler) {
/* Custom handler (files, memached, redis..) */
$session_save_handler = strval(Config::Get('system', 'session_save_handler', Null));
$session_save_path = strval(Config::Get('system', 'session_save_path', Null));
if(is_null($session_save_handler) || is_null($session_save_path)) {
logger('Session save handler or path not set', LOGGER_NORMAL, LOG_ERR);
}
else {
// Check if custom sessions backend exists
$clsname = '\Zotlabs\Web\Session' . ucfirst(strtolower($session_save_handler));
if (class_exists($clsname)) {
$handler = new $clsname($session_save_path);
}
else {
ini_set('session.save_handler', $session_save_handler);
ini_set('session.save_path', $session_save_path);
ini_set('session.gc_probability', intval(Config::Get('system', 'session_gc_probability', 1)));
ini_set('session.gc_divisor', intval(Config::Get('system', 'session_gc_divisor', 100)));
}
}
}
else {
$handler = new SessionHandler();
}
if (isset($handler)) {
$this->handler = $handler;
$x = session_set_save_handler($handler, false);
if(! $x)
logger('Session save handler initialisation failed.',LOGGER_NORMAL,LOG_ERR);
}
// Force cookies to be secure (https only) if this site is SSL enabled.
// Must be done before session_start().
$arr = session_get_cookie_params();
// Note when setting cookies: set the domain to false which creates a single domain
// cookie. If you use a hostname it will create a .domain.com wildcard which will
// have some nasty side effects if you have any other subdomains running hubzilla.
session_set_cookie_params([
'lifetime' => ((isset($arr['lifetime'])) ? $arr['lifetime'] : 0),
'path' => ((isset($arr['path'])) ? $arr['path'] : '/'),
'domain' => (($arr['domain']) ? $arr['domain'] : false),
'secure' => ((isset($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) == 'on') ? true : false),
'httponly' => ((isset($arr['httponly'])) ? $arr['httponly'] : true),
'samesite' => 'None'
]);
register_shutdown_function('session_write_close');
}
public function start() {
session_start();
$this->session_started = true;
}
/**
* @brief Resets the current session.
*
* @return void
*/
public function nuke() {
$this->new_cookie(0); // 0 means delete on browser exit
if($_SESSION && count($_SESSION)) {
foreach($_SESSION as $k => $v) {
unset($_SESSION[$k]);
}
}
}
public function new_cookie($xtime) {
$newxtime = (($xtime> 0) ? (time() + $xtime) : 0);
$old_sid = session_id();
$arr = session_get_cookie_params();
if(($this->handler || $this->custom_handler) && $this->session_started) {
session_regenerate_id(true);
// force SessionHandler record creation with the new session_id
// which occurs as a side effect of read()
if (! $this->custom_handler) {
$this->handler->read(session_id());
}
}
else
logger('no session handler');
if (x($_COOKIE, 'jsdisabled')) {
setcookie(
'jsdisabled',
$_COOKIE['jsdisabled'],
[
'expires' => $newxtime,
'path' => '/',
'domain' => false,
'secure' => ((isset($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) == 'on') ? true : false),
'httponly' => ((isset($arr['httponly'])) ? $arr['httponly'] : true),
'samesite' => 'None'
]
);
}
setcookie(
session_name(),
session_id(),
[
'expires' => $newxtime,
'path' => '/',
'domain' => false,
'secure' => ((isset($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) == 'on') ? true : false),
'httponly' => ((isset($arr['httponly'])) ? $arr['httponly'] : true),
'samesite' => 'None'
]
);
$arr = array('expire' => $xtime);
call_hooks('new_cookie', $arr);
}
public function extend_cookie() {
$arr = session_get_cookie_params();
// if there's a long-term cookie, extend it
$xtime = (($_SESSION['remember_me']) ? (60 * 60 * 24 * 365) : 0 );
if($xtime) {
setcookie(
session_name(),
session_id(),
[
'expires' => time() + $xtime,
'path' => '/',
'domain' => false,
'secure' => ((isset($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) == 'on') ? true : false),
'httponly' => ((isset($arr['httponly'])) ? $arr['httponly'] : true),
'samesite' => 'None'
]
);
}
$arr = array('expire' => $xtime);
call_hooks('extend_cookie', $arr);
}
public function return_check() {
// check a returning visitor against IP changes.
// If the change results in being blocked from re-entry with the current cookie
// nuke the session and logout.
// Returning at all indicates the session is still valid.
// first check if we're enforcing that sessions can't change IP address
// @todo what to do with IPv6 addresses
if(isset($_SESSION['addr']) && $_SESSION['addr'] != $_SERVER['REMOTE_ADDR']) {
logger('SECURITY: Session IP address changed: ' . $_SESSION['addr'] . ' != ' . $_SERVER['REMOTE_ADDR']);
$partial1 = substr($_SESSION['addr'], 0, strrpos($_SESSION['addr'], '.'));
$partial2 = substr($_SERVER['REMOTE_ADDR'], 0, strrpos($_SERVER['REMOTE_ADDR'], '.'));
$paranoia = intval(get_pconfig($_SESSION['uid'], 'system', 'paranoia'));
if(! $paranoia)
$paranoia = intval(Config::Get('system', 'paranoia'));
switch($paranoia) {
case 0:
// no IP checking
break;
case 2:
// check 2 octets
$partial1 = substr($partial1, 0, strrpos($partial1, '.'));
$partial2 = substr($partial2, 0, strrpos($partial2, '.'));
if($partial1 == $partial2)
break;
case 1:
// check 3 octets
if($partial1 == $partial2)
break;
case 3:
default:
// check any difference at all
logger('Session address changed. Paranoid setting in effect, blocking session. '
. $_SESSION['addr'] . ' != ' . $_SERVER['REMOTE_ADDR']);
$this->nuke();
goaway(z_root());
break;
}
}
return true;
}
}
|
