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
|
<?php
namespace Zotlabs\Web;
/**
*
* @brief This file includes session related functions.
*
* Session management functions. These provide database storage of PHP
* session info.
*/
class Session {
private static $handler = null;
private static $session_started = 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);
/*
* Set our session storage functions.
*/
$handler = new \Zotlabs\Web\SessionHandler();
self::$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().
$arr = session_get_cookie_params();
session_set_cookie_params(
((isset($arr['lifetime'])) ? $arr['lifetime'] : 0),
((isset($arr['path'])) ? $arr['path'] : '/'),
((isset($arr['domain'])) ? $arr['domain'] : App::get_hostname()),
((isset($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) == 'on') ? true : false),
((isset($arr['httponly'])) ? $arr['httponly'] : true)
);
register_shutdown_function('session_write_close');
}
public function start() {
session_start();
self::$session_started = true;
}
/**
* @brief Resets the current session.
*
* @return void
*/
static public function nuke() {
self::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);
$old_sid = session_id();
if(self::$handler && self::$session_started) {
session_regenerate_id(true);
// force SessionHandler record creation with the new session_id
// which occurs as a side effect of read()
self::$handler->read(session_id());
}
else
logger('no session handler');
if (x($_COOKIE, 'jsdisabled')) {
setcookie('jsdisabled', $_COOKIE['jsdisabled'], $newxtime);
}
setcookie(session_name(),session_id(),$newxtime);
$arr = array('expire' => $xtime);
call_hooks('new_cookie', $arr);
}
public function extend_cookie() {
// 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(),(time() + $xtime));
$arr = array('expire' => $xtime);
call_hooks('extend_cookie', $arr);
}
public function return_check() {
// check a returning visitor against IP changes.
// If the change results in being blocked from re-entry with the current cookie
// nuke the session and logout.
// Returning at all indicates the session is still valid.
// first check if we're enforcing that sessions can't change IP address
// @todo what to do with IPv6 addresses
if($_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)
$paranoia = intval(get_config('system', 'paranoia'));
switch($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']);
self::nuke();
goaway(z_root());
break;
}
}
return true;
}
}
|
