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
|
<?php
/**
* Elgg actions
* Allows system modules to specify actions
*
* @package Elgg
* @subpackage Core
* @author Curverider Ltd
* @link http://elgg.org/
*/
// Action setting and run *************************************************
/**
* Loads an action script, if it exists, then forwards elsewhere
*
* @param string $action The requested action
* @param string $forwarder Optionally, the location to forward to
*/
function action($action, $forwarder = "") {
global $CONFIG;
// set GET params
elgg_set_input_from_uri();
// @todo REMOVE THESE ONCE #1509 IS IN PLACE.
// Allow users to disable plugins without a token in order to
// remove plugins that are imcompatible.
// Installation cannot use tokens because it requires site secret to be
// working. (#1462)
// Login and logout are for convenience.
$exceptions = array(
'systemsettings/install',
'admin/plugins/disable',
'logout',
'login'
);
if (!in_array($action, $exceptions)) {
// All actions require a token.
action_gatekeeper();
}
$forwarder = str_replace($CONFIG->url, "", $forwarder);
$forwarder = str_replace("http://", "", $forwarder);
$forwarder = str_replace("@", "", $forwarder);
if (substr($forwarder,0,1) == "/") {
$forwarder = substr($forwarder,1);
}
if (isset($CONFIG->actions[$action])) {
if ((isadminloggedin()) || (!$CONFIG->actions[$action]['admin'])) {
if ($CONFIG->actions[$action]['public'] || $_SESSION['id'] != -1) {
// Trigger action event TODO: This is only called before the primary action is called. We need to rethink actions for 1.5
$event_result = true;
$event_result = trigger_plugin_hook('action', $action, null, $event_result);
// Include action
// Event_result being false doesn't produce an error -
// since i assume this will be handled in the hook itself.
// TODO make this better!
if ($event_result) {
if (!include($CONFIG->actions[$action]['file'])) {
register_error(sprintf(elgg_echo('actionundefined'),$action));
}
}
} else {
register_error(elgg_echo('actionloggedout'));
}
}
} else {
register_error(sprintf(elgg_echo('actionundefined'),$action));
}
forward($CONFIG->url . $forwarder);
}
/**
* Registers a particular action in memory
*
* @param string $action The name of the action (eg "register", "account/settings/save")
* @param boolean $public Can this action be accessed by people not logged into the system?
* @param string $filename Optionally, the filename where this action is located
* @param boolean $admin_only Whether this action is only available to admin users.
*/
function register_action($action, $public = false, $filename = "", $admin_only = false) {
global $CONFIG;
if (!isset($CONFIG->actions)) {
$CONFIG->actions = array();
}
if (empty($filename)) {
$path = "";
if (isset($CONFIG->path)) {
$path = $CONFIG->path;
}
$filename = $path . "actions/" . $action . ".php";
}
$CONFIG->actions[$action] = array('file' => $filename, 'public' => $public, 'admin' => $admin_only);
return true;
}
/**
* Actions to perform on initialisation
*
* @param string $event Events API required parameters
* @param string $object_type Events API required parameters
* @param string $object Events API required parameters
*/
function actions_init($event, $object_type, $object) {
register_action("error");
return true;
}
/**
* Validate an action token, returning true if valid and false if not
*
* @return unknown
*/
function validate_action_token($visibleerrors = true) {
$token = get_input('__elgg_token');
$ts = get_input('__elgg_ts');
$session_id = session_id();
if (($token) && ($ts) && ($session_id)) {
// generate token, check with input and forward if invalid
$generated_token = generate_action_token($ts);
// Validate token
if ($token == $generated_token) {
$hour = 60*60;
$now = time();
// Validate time to ensure its not crazy
if (($ts>$now-$hour) && ($ts<$now+$hour)) {
// We have already got this far, so unless anything
// else says something to the contry we assume we're ok
$returnval = true;
$returnval = trigger_plugin_hook('action_gatekeeper:permissions:check', 'all', array(
'token' => $token,
'time' => $ts
), $returnval);
if ($returnval) {
return true;
} else if ($visibleerrors) {
register_error(elgg_echo('actiongatekeeper:pluginprevents'));
}
} else if ($visibleerrors) {
register_error(elgg_echo('actiongatekeeper:timeerror'));
}
} else if ($visibleerrors) {
register_error(elgg_echo('actiongatekeeper:tokeninvalid'));
}
}
else if ($visibleerrors) {
register_error(elgg_echo('actiongatekeeper:missingfields'));
}
return FALSE;
}
/**
* Action gatekeeper.
* This function verifies form input for security features (like a generated token), and forwards
* the page if they are invalid.
*
* Place at the head of actions.
*/
function action_gatekeeper() {
if (validate_action_token()) {
return TRUE;
}
forward();
exit;
}
/**
* Generate a token for the current user suitable for being placed in a hidden field in action forms.
*
* @param int $timestamp Unix timestamp
*/
function generate_action_token($timestamp) {
// Get input values
$site_secret = get_site_secret();
// Current session id
$session_id = session_id();
// Get user agent
$ua = $_SERVER['HTTP_USER_AGENT'];
// Session token
$st = $_SESSION['__elgg_session'];
if (($site_secret) && ($session_id)) {
return md5($site_secret.$timestamp.$session_id.$ua.$st);
}
return FALSE;
}
/**
* Initialise the site secret.
*
*/
function init_site_secret() {
$secret = md5(rand().microtime());
if (datalist_set('__site_secret__', $secret)) {
return $secret;
}
return FALSE;
}
/**
* Retrieve the site secret.
*
*/
function get_site_secret() {
$secret = datalist_get('__site_secret__');
if (!$secret) {
$secret = init_site_secret();
}
return $secret;
}
// Register some actions ***************************************************
register_elgg_event_handler("init","system","actions_init");
|
