forked from koreapyj/php-namumark
/
XSSfilter.php
228 lines (201 loc) · 6.98 KB
/
XSSfilter.php
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
<?php
/**
* PHP 富文本XSS???
*
* @package XssHtml
* @version 1.0.0
* @link http://phith0n.github.io/XssHtml
* @since 20140621
* @copyright (c) Phithon All Rights Reserved
*
*/
#
# Written by Phithon <root@leavesongs.com> in 2014 and placed in
# the public domain.
#
# phithon <root@leavesongs.com> ??于20140621
# From: XDSEC <www.xdsec.org> & ??歌 <www.leavesongs.com>
# Usage:
# <?php
# require('xsshtml.class.php');
# $html = '<html code>';
# $xss = new XssHtml($html);
# $html = $xss->getHtml();
# ?\>
#
# 需求：
# PHP Version > 5.0
# ??器版本：IE7+ 或其他??器，无法防御IE6及以下版本??器中的XSS
# 更多使用??? http://phith0n.github.io/XssHtml
class XssHtml {
private $m_dom;
private $m_xss;
private $m_ok;
private $m_AllowAttr = array('title', 'src', 'href', 'id', 'class', 'style', 'width', 'height', 'alt', 'target', 'align', 'allowfullscreen');
private $m_AllowTag = array('a', 'img', 'br', 'strong', 'b', 'code', 'pre', 'p', 'div', 'em', 'span', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'table', 'ul', 'ol', 'tr', 'th', 'td', 'hr', 'li', 'u', 'iframe', 'embed');
/**
* ?造函?
*
* @param string $html 待??的文本
* @param string $charset 文本??，默?utf-8
* @param array $AllowTag 允?的??，如果不?楚?保持默?，默?已涵盖大部分功能，不要增加危???
*/
public function __construct($html, $charset = 'utf-8', $AllowTag = array()){
$this->m_AllowTag = empty($AllowTag) ? $this->m_AllowTag : $AllowTag;
$this->m_xss = strip_tags($html, '<' . implode('><', $this->m_AllowTag) . '>');
if (empty($this->m_xss)) {
$this->m_ok = FALSE;
return;
}
$this->m_xss = "<meta http-equiv=\"Content-Type\" content=\"text/html;charset={$charset}\"><nouse>" . $this->m_xss . "</nouse>";
$this->m_dom = new DOMDocument();
$this->m_dom->strictErrorChecking = FALSE;
$this->m_ok = @$this->m_dom->loadHTML($this->m_xss);
}
/**
* ?得??后的?容
*/
public function getHtml()
{
if (!$this->m_ok) {
return '';
}
$nodeList = $this->m_dom->getElementsByTagName('*');
for ($i = 0; $i < $nodeList->length; $i++){
$node = $nodeList->item($i);
if (in_array($node->nodeName, $this->m_AllowTag)) {
if (method_exists($this, "__node_{$node->nodeName}")) {
call_user_func(array($this, "__node_{$node->nodeName}"), $node);
}else{
call_user_func(array($this, '__node_default'), $node);
}
}
}
$html = strip_tags($this->m_dom->saveHTML(), '<' . implode('><', $this->m_AllowTag) . '>');
$html = preg_replace('/^\n(.*)\n$/s', '$1', $html);
return $html;
}
private function __true_url($url){
if (preg_match('#^(https?:)?//.+#is', $url)) {
return $url;
}else{
return 'http://' . $url;
}
}
private function __get_style($node){
if ($node->attributes->getNamedItem('style')) {
$style = $node->attributes->getNamedItem('style')->nodeValue;
$style = str_replace('\\', ' ', $style);
$style = str_replace(array('&#', '/*', '*/'), ' ', $style);
$style = preg_replace('#e.*x.*p.*r.*e.*s.*s.*i.*o.*n#Uis', ' ', $style);
return $style;
}else{
return '';
}
}
private function __get_link($node, $att){
$link = $node->attributes->getNamedItem($att);
if ($link) {
return $this->__true_url($link->nodeValue);
}else{
return '';
}
}
private function __setAttr($dom, $attr, $val){
if (!empty($val)) {
$dom->setAttribute($attr, $val);
}
}
private function __setName(DOMNode $oldNode, $newName, $newNS = null) {
if (isset($newNS))
{
$newNode = $oldNode->ownerDocument->createElementNS($newNS, $newName);
}
else
{
$newNode = $oldNode->ownerDocument->createElement($newName);
}
foreach ($oldNode->attributes as $attr)
{
$newNode->appendChild($attr->cloneNode());
}
foreach ($oldNode->childNodes as $child)
{
$newNode->appendChild($child->cloneNode(true));
}
$oldNode->parentNode->replaceChild($newNode, $oldNode);
}
private function __set_default_attr($node, $attr, $default = '')
{
$o = $node->attributes->getNamedItem($attr);
if ($o) {
$this->__setAttr($node, $attr, $o->nodeValue);
}else{
$this->__setAttr($node, $attr, $default);
}
}
private function __common_attr($node)
{
$list = array();
foreach ($node->attributes as $attr) {
if (!in_array($attr->nodeName,
$this->m_AllowAttr)) {
$list[] = $attr->nodeName;
}
}
foreach ($list as $attr) {
$node->removeAttribute($attr);
}
$style = $this->__get_style($node);
$this->__setAttr($node, 'style', $style);
$this->__set_default_attr($node, 'title');
$this->__set_default_attr($node, 'id');
$this->__set_default_attr($node, 'class');
}
private function __node_img($node){
$this->__common_attr($node);
$this->__set_default_attr($node, 'src');
$this->__set_default_attr($node, 'width');
$this->__set_default_attr($node, 'height');
$this->__set_default_attr($node, 'alt');
$this->__set_default_attr($node, 'align');
}
private function __node_a($node){
$this->__common_attr($node);
$href = $this->__get_link($node, 'href');
$this->__setAttr($node, 'href', $href);
$this->__set_default_attr($node, 'target', '_blank');
}
private function __node_embed($node){
$this->__common_attr($node);
$link = $this->__get_link($node, 'src');
if(preg_match('@^(?:https?:)?//www\.youtube\.com/v/(.*)@', $link, $youtube)) {
$link = '//www.youtube.com/embed/'.$youtube[1];
$this->__setAttr($node, 'src', $link);
$this->__setName($node, 'iframe');
return;
}
$this->__setAttr($node, 'src', $link);
$this->__setAttr($node, 'allowscriptaccess', 'never');
$this->__set_default_attr($node, 'width');
$this->__set_default_attr($node, 'height');
}
private function __node_iframe($node) {
$this->__common_attr($node);
$link = $this->__get_link($node, 'src');
$link = preg_replace('@^http://www\.youtube\.com@', '//www.youtube.com', $link);
$link = preg_replace('@^http://videofarm\.daum\.net@', '//videofarm.daum.net', $link);
$link = preg_replace('@^http://embed\.ted\.com@', '//embed.ted.com', $link);
$this->__setAttr($node, 'src', $link);
}
private function __node_default($node){
$this->__common_attr($node);
}
}
// if(php_sapi_name() == "cli"){
// $html = $argv[1];
// $xss = new XssHtml($html);
// $html = $xss->getHtml();
// echo "'$html'";
// }
?>