|
1
|
<?php
|
|
2
|
|
|
3
|
/**
|
|
4
|
* @file
|
|
5
|
* Contains code for sanitizing user input from the request.
|
|
6
|
*/
|
|
7
|
|
|
8
|
/**
|
|
9
|
* Sanitizes user input from the request.
|
|
10
|
*/
|
|
11
|
class DrupalRequestSanitizer {
|
|
12
|
|
|
13
|
/**
|
|
14
|
* Tracks whether the request was already sanitized.
|
|
15
|
*/
|
|
16
|
protected static $sanitized = FALSE;
|
|
17
|
|
|
18
|
/**
|
|
19
|
* Modifies the request to strip dangerous keys from user input.
|
|
20
|
*/
|
|
21
|
public static function sanitize() {
|
|
22
|
if (!self::$sanitized) {
|
|
23
|
$whitelist = variable_get('sanitize_input_whitelist', array());
|
|
24
|
$log_sanitized_keys = variable_get('sanitize_input_logging', FALSE);
|
|
25
|
|
|
26
|
// Process query string parameters.
|
|
27
|
$get_sanitized_keys = array();
|
|
28
|
$_GET = self::stripDangerousValues($_GET, $whitelist, $get_sanitized_keys);
|
|
29
|
if ($log_sanitized_keys && $get_sanitized_keys) {
|
|
30
|
_drupal_trigger_error_with_delayed_logging(format_string('Potentially unsafe keys removed from query string parameters (GET): @keys', array('@keys' => implode(', ', $get_sanitized_keys))), E_USER_NOTICE);
|
|
31
|
}
|
|
32
|
|
|
33
|
// Process request body parameters.
|
|
34
|
$post_sanitized_keys = array();
|
|
35
|
$_POST = self::stripDangerousValues($_POST, $whitelist, $post_sanitized_keys);
|
|
36
|
if ($log_sanitized_keys && $post_sanitized_keys) {
|
|
37
|
_drupal_trigger_error_with_delayed_logging(format_string('Potentially unsafe keys removed from request body parameters (POST): @keys', array('@keys' => implode(', ', $post_sanitized_keys))), E_USER_NOTICE);
|
|
38
|
}
|
|
39
|
|
|
40
|
// Process cookie parameters.
|
|
41
|
$cookie_sanitized_keys = array();
|
|
42
|
$_COOKIE = self::stripDangerousValues($_COOKIE, $whitelist, $cookie_sanitized_keys);
|
|
43
|
if ($log_sanitized_keys && $cookie_sanitized_keys) {
|
|
44
|
_drupal_trigger_error_with_delayed_logging(format_string('Potentially unsafe keys removed from cookie parameters (COOKIE): @keys', array('@keys' => implode(', ', $cookie_sanitized_keys))), E_USER_NOTICE);
|
|
45
|
}
|
|
46
|
|
|
47
|
$request_sanitized_keys = array();
|
|
48
|
$_REQUEST = self::stripDangerousValues($_REQUEST, $whitelist, $request_sanitized_keys);
|
|
49
|
|
|
50
|
self::$sanitized = TRUE;
|
|
51
|
}
|
|
52
|
}
|
|
53
|
|
|
54
|
/**
|
|
55
|
* Removes the destination if it is dangerous.
|
|
56
|
*
|
|
57
|
* Note this can only be called after common.inc has been included.
|
|
58
|
*
|
|
59
|
* @return bool
|
|
60
|
* TRUE if the destination has been removed from $_GET, FALSE if not.
|
|
61
|
*/
|
|
62
|
public static function cleanDestination() {
|
|
63
|
$dangerous_keys = array();
|
|
64
|
$log_sanitized_keys = variable_get('sanitize_input_logging', FALSE);
|
|
65
|
|
|
66
|
$parts = drupal_parse_url($_GET['destination']);
|
|
67
|
// If there is a query string, check its query parameters.
|
|
68
|
if (!empty($parts['query'])) {
|
|
69
|
$whitelist = variable_get('sanitize_input_whitelist', array());
|
|
70
|
|
|
71
|
self::stripDangerousValues($parts['query'], $whitelist, $dangerous_keys);
|
|
72
|
if (!empty($dangerous_keys)) {
|
|
73
|
// The destination is removed rather than sanitized to mirror the
|
|
74
|
// handling of external destinations.
|
|
75
|
unset($_GET['destination']);
|
|
76
|
unset($_REQUEST['destination']);
|
|
77
|
if ($log_sanitized_keys) {
|
|
78
|
trigger_error(format_string('Potentially unsafe destination removed from query string parameters (GET) because it contained the following keys: @keys', array('@keys' => implode(', ', $dangerous_keys))));
|
|
79
|
}
|
|
80
|
return TRUE;
|
|
81
|
}
|
|
82
|
}
|
|
83
|
return FALSE;
|
|
84
|
}
|
|
85
|
|
|
86
|
/**
|
|
87
|
* Strips dangerous keys from the provided input.
|
|
88
|
*
|
|
89
|
* @param mixed $input
|
|
90
|
* The input to sanitize.
|
|
91
|
* @param string[] $whitelist
|
|
92
|
* An array of keys to whitelist as safe.
|
|
93
|
* @param string[] $sanitized_keys
|
|
94
|
* An array of keys that have been removed.
|
|
95
|
*
|
|
96
|
* @return mixed
|
|
97
|
* The sanitized input.
|
|
98
|
*/
|
|
99
|
protected static function stripDangerousValues($input, array $whitelist, array &$sanitized_keys) {
|
|
100
|
if (is_array($input)) {
|
|
101
|
foreach ($input as $key => $value) {
|
|
102
|
if ($key !== '' && $key[0] === '#' && !in_array($key, $whitelist, TRUE)) {
|
|
103
|
unset($input[$key]);
|
|
104
|
$sanitized_keys[] = $key;
|
|
105
|
}
|
|
106
|
else {
|
|
107
|
$input[$key] = self::stripDangerousValues($input[$key], $whitelist, $sanitized_keys);
|
|
108
|
}
|
|
109
|
}
|
|
110
|
}
|
|
111
|
return $input;
|
|
112
|
}
|
|
113
|
|
|
114
|
}
|
