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1 | <?php |
2 | /* | |
3 | +--------------------------------------------------------------------+ | |
232624b1 | 4 | | CiviCRM version 4.4 | |
6a488035 TO |
5 | +--------------------------------------------------------------------+ |
6 | | Copyright CiviCRM LLC (c) 2004-2013 | | |
7 | +--------------------------------------------------------------------+ | |
8 | | This file is a part of CiviCRM. | | |
9 | | | | |
10 | | CiviCRM is free software; you can copy, modify, and distribute it | | |
11 | | under the terms of the GNU Affero General Public License | | |
12 | | Version 3, 19 November 2007 and the CiviCRM Licensing Exception. | | |
13 | | | | |
14 | | CiviCRM is distributed in the hope that it will be useful, but | | |
15 | | WITHOUT ANY WARRANTY; without even the implied warranty of | | |
16 | | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | | |
17 | | See the GNU Affero General Public License for more details. | | |
18 | | | | |
19 | | You should have received a copy of the GNU Affero General Public | | |
20 | | License and the CiviCRM Licensing Exception along | | |
21 | | with this program; if not, contact CiviCRM LLC | | |
22 | | at info[AT]civicrm[DOT]org. If you have questions about the | | |
23 | | GNU Affero General Public License or the licensing of CiviCRM, | | |
24 | | see the CiviCRM license FAQ at http://civicrm.org/licensing | | |
25 | +--------------------------------------------------------------------+ | |
26 | */ | |
27 | ||
28 | /** | |
29 | * | |
30 | * @package CRM | |
31 | * @copyright CiviCRM LLC (c) 2004-2013 | |
32 | * $Id$ | |
33 | * | |
34 | */ | |
35 | class CRM_Core_Key { | |
36 | static $_key = NULL; | |
37 | ||
38 | static $_sessionID = NULL; | |
39 | ||
40 | /** | |
41 | * Generate a private key per session and store in session | |
42 | * | |
43 | * @return string private key for this session | |
44 | * @static | |
45 | * @access private | |
46 | */ | |
47 | static function privateKey() { | |
48 | if (!self::$_key) { | |
49 | $session = CRM_Core_Session::singleton(); | |
50 | self::$_key = $session->get('qfPrivateKey'); | |
51 | if (!self::$_key) { | |
52 | self::$_key = md5(uniqid(mt_rand(), TRUE)) . md5(uniqid(mt_rand(), TRUE)); | |
53 | $session->set('qfPrivateKey', self::$_key); | |
54 | } | |
55 | } | |
56 | return self::$_key; | |
57 | } | |
58 | ||
59 | static function sessionID() { | |
60 | if (!self::$_sessionID) { | |
61 | $session = CRM_Core_Session::singleton(); | |
62 | self::$_sessionID = $session->get('qfSessionID'); | |
63 | if (!self::$_sessionID) { | |
64 | self::$_sessionID = session_id(); | |
65 | $session->set('qfSessionID', self::$_sessionID); | |
66 | } | |
67 | } | |
68 | return self::$_sessionID; | |
69 | } | |
70 | ||
71 | /** | |
72 | * Generate a form key based on form name, the current user session | |
73 | * and a private key. Modelled after drupal's form API | |
74 | * | |
75 | * @param string $value name of the form | |
76 | * @paeam boolean $addSequence should we add a unique sequence number to the end of the key | |
77 | * | |
78 | * @return string valid formID | |
79 | * @static | |
80 | * @acess public | |
81 | */ | |
82 | static function get($name, $addSequence = FALSE) { | |
83 | $privateKey = self::privateKey(); | |
84 | $sessionID = self::sessionID(); | |
85 | $key = md5($sessionID . $name . $privateKey); | |
86 | ||
87 | if ($addSequence) { | |
88 | // now generate a random number between 1 and 100K and add it to the key | |
89 | // so that we can have forms in mutiple tabs etc | |
90 | $key = $key . '_' . mt_rand(1, 10000); | |
91 | } | |
92 | return $key; | |
93 | } | |
94 | ||
95 | /** | |
96 | * Validate a form key based on the form name | |
97 | * | |
98 | * @param string $formKey | |
99 | * @param string $name | |
100 | * | |
101 | * @return string $formKey if valid, else null | |
102 | * @static | |
103 | * @acess public | |
104 | */ | |
105 | static function validate($key, $name, $addSequence = FALSE) { | |
106 | if (!is_string($key)) { | |
107 | return NULL; | |
108 | } | |
109 | ||
110 | if ($addSequence) { | |
111 | list($k, $t) = explode('_', $key); | |
112 | if ($t < 1 || $t > 10000) { | |
113 | return NULL; | |
114 | } | |
115 | } | |
116 | else { | |
117 | $k = $key; | |
118 | } | |
119 | ||
120 | $privateKey = self::privateKey(); | |
121 | $sessionID = self::sessionID(); | |
122 | if ($k != md5($sessionID . $name . $privateKey)) { | |
123 | return NULL; | |
124 | } | |
125 | return $key; | |
126 | } | |
127 | ||
128 | static function valid($key) { | |
129 | // a valid key is a 32 digit hex number | |
130 | // followed by an optional _ and a number between 1 and 10000 | |
131 | if (strpos('_', $key) !== FALSE) { | |
132 | list($hash, $seq) = explode('_', $key); | |
133 | ||
134 | // ensure seq is between 1 and 10000 | |
135 | if (!is_numeric($seq) || | |
136 | $seq < 1 || | |
137 | $seq > 10000 | |
138 | ) { | |
139 | return FALSE; | |
140 | } | |
141 | } | |
142 | else { | |
143 | $hash = $key; | |
144 | } | |
145 | ||
146 | // ensure that hash is a 32 digit hex number | |
147 | return preg_match('#[0-9a-f]{32}#i', $hash) ? TRUE : FALSE; | |
148 | } | |
149 | } | |
150 |