| [44] | 1 | <?php
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| 2 | /**
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| 3 | * HTML/XHTML filter that only allows some elements and attributes
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| 4 | *
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| 5 | * Added wp_ prefix to avoid conflicts with existing kses users
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| 6 | *
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| 7 | * @version 0.2.2
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| 8 | * @copyright (C) 2002, 2003, 2005
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| 9 | * @author Ulf Harnhammar <metaur@users.sourceforge.net>
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| 10 | *
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| 11 | * @package External
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| 12 | * @subpackage KSES
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| 13 | *
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| 14 | * @internal
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| 15 | * *** CONTACT INFORMATION ***
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| 16 | * E-mail: metaur at users dot sourceforge dot net
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| 17 | * Web page: http://sourceforge.net/projects/kses
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| 18 | * Paper mail: Ulf Harnhammar
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| 19 | * Ymergatan 17 C
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| 20 | * 753 25 Uppsala
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| 21 | * SWEDEN
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| 22 | *
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| 23 | * [kses strips evil scripts!]
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| 24 | */
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| 25 |
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| 26 | /**
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| 27 | * You can override this in your my-hacks.php file You can also override this
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| 28 | * in a plugin file. The my-hacks.php is deprecated in its usage.
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| 29 | *
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| 30 | * @since 1.2.0
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| 31 | */
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| 32 | if (!defined('CUSTOM_TAGS'))
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| 33 | define('CUSTOM_TAGS', false);
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| 34 |
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| 35 | if (!CUSTOM_TAGS) {
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| 36 | /**
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| 37 | * Kses global for default allowable HTML tags.
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| 38 | *
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| 39 | * Can be override by using CUSTOM_TAGS constant.
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| 40 | *
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| 41 | * @global array $allowedposttags
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| 42 | * @since 2.0.0
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| 43 | */
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| 44 | $allowedposttags = array(
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| 45 | 'address' => array(),
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| 46 | 'a' => array(
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| 47 | 'class' => array (),
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| 48 | 'href' => array (),
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| 49 | 'id' => array (),
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| 50 | 'title' => array (),
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| 51 | 'rel' => array (),
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| 52 | 'rev' => array (),
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| 53 | 'name' => array (),
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| 54 | 'target' => array()),
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| 55 | 'abbr' => array(
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| 56 | 'class' => array (),
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| 57 | 'title' => array ()),
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| 58 | 'acronym' => array(
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| 59 | 'title' => array ()),
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| 60 | 'b' => array(),
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| 61 | 'big' => array(),
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| 62 | 'blockquote' => array(
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| 63 | 'id' => array (),
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| 64 | 'cite' => array (),
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| 65 | 'class' => array(),
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| 66 | 'lang' => array(),
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| 67 | 'xml:lang' => array()),
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| 68 | 'br' => array (
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| 69 | 'class' => array ()),
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| 70 | 'button' => array(
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| 71 | 'disabled' => array (),
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| 72 | 'name' => array (),
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| 73 | 'type' => array (),
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| 74 | 'value' => array ()),
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| 75 | 'caption' => array(
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| 76 | 'align' => array (),
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| 77 | 'class' => array ()),
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| 78 | 'cite' => array (
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| 79 | 'class' => array(),
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| 80 | 'dir' => array(),
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| 81 | 'lang' => array(),
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| 82 | 'title' => array ()),
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| 83 | 'code' => array (
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| 84 | 'style' => array()),
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| 85 | 'col' => array(
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| 86 | 'align' => array (),
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| 87 | 'char' => array (),
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| 88 | 'charoff' => array (),
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| 89 | 'span' => array (),
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| 90 | 'dir' => array(),
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| 91 | 'style' => array (),
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| 92 | 'valign' => array (),
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| 93 | 'width' => array ()),
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| 94 | 'del' => array(
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| 95 | 'datetime' => array ()),
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| 96 | 'dd' => array(),
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| 97 | 'div' => array(
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| 98 | 'align' => array (),
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| 99 | 'class' => array (),
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| 100 | 'dir' => array (),
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| 101 | 'lang' => array(),
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| 102 | 'style' => array (),
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| 103 | 'xml:lang' => array()),
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| 104 | 'dl' => array(),
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| 105 | 'dt' => array(),
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| 106 | 'em' => array(),
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| 107 | 'fieldset' => array(),
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| 108 | 'font' => array(
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| 109 | 'color' => array (),
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| 110 | 'face' => array (),
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| 111 | 'size' => array ()),
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| 112 | 'form' => array(
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| 113 | 'action' => array (),
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| 114 | 'accept' => array (),
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| 115 | 'accept-charset' => array (),
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| 116 | 'enctype' => array (),
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| 117 | 'method' => array (),
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| 118 | 'name' => array (),
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| 119 | 'target' => array ()),
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| 120 | 'h1' => array(
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| 121 | 'align' => array (),
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| 122 | 'class' => array (),
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| 123 | 'id' => array (),
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| 124 | 'style' => array ()),
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| 125 | 'h2' => array (
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| 126 | 'align' => array (),
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| 127 | 'class' => array (),
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| 128 | 'id' => array (),
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| 129 | 'style' => array ()),
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| 130 | 'h3' => array (
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| 131 | 'align' => array (),
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| 132 | 'class' => array (),
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| 133 | 'id' => array (),
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| 134 | 'style' => array ()),
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| 135 | 'h4' => array (
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| 136 | 'align' => array (),
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| 137 | 'class' => array (),
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| 138 | 'id' => array (),
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| 139 | 'style' => array ()),
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| 140 | 'h5' => array (
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| 141 | 'align' => array (),
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| 142 | 'class' => array (),
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| 143 | 'id' => array (),
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| 144 | 'style' => array ()),
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| 145 | 'h6' => array (
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| 146 | 'align' => array (),
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| 147 | 'class' => array (),
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| 148 | 'id' => array (),
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| 149 | 'style' => array ()),
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| 150 | 'hr' => array (
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| 151 | 'align' => array (),
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| 152 | 'class' => array (),
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| 153 | 'noshade' => array (),
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| 154 | 'size' => array (),
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| 155 | 'width' => array ()),
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| 156 | 'i' => array(),
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| 157 | 'img' => array(
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| 158 | 'alt' => array (),
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| 159 | 'align' => array (),
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| 160 | 'border' => array (),
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| 161 | 'class' => array (),
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| 162 | 'height' => array (),
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| 163 | 'hspace' => array (),
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| 164 | 'longdesc' => array (),
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| 165 | 'vspace' => array (),
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| 166 | 'src' => array (),
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| 167 | 'style' => array (),
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| 168 | 'width' => array ()),
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| 169 | 'ins' => array(
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| 170 | 'datetime' => array (),
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| 171 | 'cite' => array ()),
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| 172 | 'kbd' => array(),
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| 173 | 'label' => array(
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| 174 | 'for' => array ()),
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| 175 | 'legend' => array(
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| 176 | 'align' => array ()),
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| 177 | 'li' => array (
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| 178 | 'align' => array (),
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| 179 | 'class' => array ()),
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| 180 | 'p' => array(
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| 181 | 'class' => array (),
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| 182 | 'align' => array (),
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| 183 | 'dir' => array(),
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| 184 | 'lang' => array(),
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| 185 | 'style' => array (),
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| 186 | 'xml:lang' => array()),
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| 187 | 'pre' => array(
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| 188 | 'style' => array(),
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| 189 | 'width' => array ()),
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| 190 | 'q' => array(
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| 191 | 'cite' => array ()),
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| 192 | 's' => array(),
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| 193 | 'span' => array (
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| 194 | 'class' => array (),
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| 195 | 'dir' => array (),
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| 196 | 'align' => array (),
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| 197 | 'lang' => array (),
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| 198 | 'style' => array (),
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| 199 | 'title' => array (),
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| 200 | 'xml:lang' => array()),
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| 201 | 'strike' => array(),
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| 202 | 'strong' => array(),
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| 203 | 'sub' => array(),
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| 204 | 'sup' => array(),
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| 205 | 'table' => array(
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| 206 | 'align' => array (),
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| 207 | 'bgcolor' => array (),
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| 208 | 'border' => array (),
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| 209 | 'cellpadding' => array (),
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| 210 | 'cellspacing' => array (),
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| 211 | 'class' => array (),
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| 212 | 'dir' => array(),
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| 213 | 'id' => array(),
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| 214 | 'rules' => array (),
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| 215 | 'style' => array (),
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| 216 | 'summary' => array (),
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| 217 | 'width' => array ()),
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| 218 | 'tbody' => array(
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| 219 | 'align' => array (),
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| 220 | 'char' => array (),
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| 221 | 'charoff' => array (),
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| 222 | 'valign' => array ()),
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| 223 | 'td' => array(
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| 224 | 'abbr' => array (),
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| 225 | 'align' => array (),
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| 226 | 'axis' => array (),
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| 227 | 'bgcolor' => array (),
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| 228 | 'char' => array (),
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| 229 | 'charoff' => array (),
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| 230 | 'class' => array (),
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| 231 | 'colspan' => array (),
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| 232 | 'dir' => array(),
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| 233 | 'headers' => array (),
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| 234 | 'height' => array (),
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| 235 | 'nowrap' => array (),
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| 236 | 'rowspan' => array (),
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| 237 | 'scope' => array (),
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| 238 | 'style' => array (),
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| 239 | 'valign' => array (),
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| 240 | 'width' => array ()),
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| 241 | 'textarea' => array(
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| 242 | 'cols' => array (),
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| 243 | 'rows' => array (),
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| 244 | 'disabled' => array (),
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| 245 | 'name' => array (),
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| 246 | 'readonly' => array ()),
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| 247 | 'tfoot' => array(
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| 248 | 'align' => array (),
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| 249 | 'char' => array (),
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| 250 | 'class' => array (),
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| 251 | 'charoff' => array (),
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| 252 | 'valign' => array ()),
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| 253 | 'th' => array(
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| 254 | 'abbr' => array (),
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| 255 | 'align' => array (),
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| 256 | 'axis' => array (),
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| 257 | 'bgcolor' => array (),
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| 258 | 'char' => array (),
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| 259 | 'charoff' => array (),
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| 260 | 'class' => array (),
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| 261 | 'colspan' => array (),
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| 262 | 'headers' => array (),
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| 263 | 'height' => array (),
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| 264 | 'nowrap' => array (),
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| 265 | 'rowspan' => array (),
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| 266 | 'scope' => array (),
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| 267 | 'valign' => array (),
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| 268 | 'width' => array ()),
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| 269 | 'thead' => array(
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| 270 | 'align' => array (),
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| 271 | 'char' => array (),
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| 272 | 'charoff' => array (),
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| 273 | 'class' => array (),
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| 274 | 'valign' => array ()),
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| 275 | 'title' => array(),
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| 276 | 'tr' => array(
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| 277 | 'align' => array (),
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| 278 | 'bgcolor' => array (),
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| 279 | 'char' => array (),
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| 280 | 'charoff' => array (),
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| 281 | 'class' => array (),
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| 282 | 'style' => array (),
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| 283 | 'valign' => array ()),
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| 284 | 'tt' => array(),
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| 285 | 'u' => array(),
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| 286 | 'ul' => array (
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| 287 | 'class' => array (),
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| 288 | 'style' => array (),
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| 289 | 'type' => array ()),
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| 290 | 'ol' => array (
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| 291 | 'class' => array (),
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| 292 | 'start' => array (),
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| 293 | 'style' => array (),
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| 294 | 'type' => array ()),
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| 295 | 'var' => array ());
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| 296 |
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| 297 | /**
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| 298 | * Kses allowed HTML elements.
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| 299 | *
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| 300 | * @global array $allowedtags
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| 301 | * @since 1.0.0
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| 302 | */
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| 303 | $allowedtags = array(
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| 304 | 'a' => array(
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| 305 | 'href' => array (),
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| 306 | 'title' => array ()),
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| 307 | 'abbr' => array(
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| 308 | 'title' => array ()),
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| 309 | 'acronym' => array(
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| 310 | 'title' => array ()),
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| 311 | 'b' => array(),
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| 312 | 'blockquote' => array(
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| 313 | 'cite' => array ()),
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| 314 | // 'br' => array(),
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| 315 | 'cite' => array (),
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| 316 | 'code' => array(),
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| 317 | 'del' => array(
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| 318 | 'datetime' => array ()),
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| 319 | // 'dd' => array(),
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| 320 | // 'dl' => array(),
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| 321 | // 'dt' => array(),
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| 322 | 'em' => array (), 'i' => array (),
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| 323 | // 'ins' => array('datetime' => array(), 'cite' => array()),
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| 324 | // 'li' => array(),
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| 325 | // 'ol' => array(),
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| 326 | // 'p' => array(),
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| 327 | 'q' => array(
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| 328 | 'cite' => array ()),
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| 329 | 'strike' => array(),
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| 330 | 'strong' => array(),
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| 331 | // 'sub' => array(),
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| 332 | // 'sup' => array(),
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| 333 | // 'u' => array(),
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| 334 | // 'ul' => array(),
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| 335 | );
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| 336 | }
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| 337 |
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| 338 | /**
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| 339 | * Filters content and keeps only allowable HTML elements.
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| 340 | *
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| 341 | * This function makes sure that only the allowed HTML element names, attribute
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| 342 | * names and attribute values plus only sane HTML entities will occur in
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| 343 | * $string. You have to remove any slashes from PHP's magic quotes before you
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| 344 | * call this function.
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| 345 | *
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| 346 | * The default allowed protocols are 'http', 'https', 'ftp', 'mailto', 'news',
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| 347 | * 'irc', 'gopher', 'nntp', 'feed', and finally 'telnet. This covers all common
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| 348 | * link protocols, except for 'javascript' which should not be allowed for
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| 349 | * untrusted users.
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| 350 | *
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| 351 | * @since 1.0.0
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| 352 | *
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| 353 | * @param string $string Content to filter through kses
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| 354 | * @param array $allowed_html List of allowed HTML elements
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| 355 | * @param array $allowed_protocols Optional. Allowed protocol in links.
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| 356 | * @return string Filtered content with only allowed HTML elements
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| 357 | */
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| 358 | function wp_kses($string, $allowed_html, $allowed_protocols = array ('http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet')) {
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| 359 | $string = wp_kses_no_null($string);
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| 360 | $string = wp_kses_js_entities($string);
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| 361 | $string = wp_kses_normalize_entities($string);
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| 362 | $allowed_html_fixed = wp_kses_array_lc($allowed_html);
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| 363 | $string = wp_kses_hook($string, $allowed_html_fixed, $allowed_protocols); // WP changed the order of these funcs and added args to wp_kses_hook
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| 364 | return wp_kses_split($string, $allowed_html_fixed, $allowed_protocols);
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| 365 | }
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| 366 |
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| 367 | /**
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| 368 | * You add any kses hooks here.
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| 369 | *
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| 370 | * There is currently only one kses WordPress hook and it is called here. All
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| 371 | * parameters are passed to the hooks and expected to recieve a string.
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| 372 | *
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| 373 | * @since 1.0.0
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| 374 | *
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| 375 | * @param string $string Content to filter through kses
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| 376 | * @param array $allowed_html List of allowed HTML elements
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| 377 | * @param array $allowed_protocols Allowed protocol in links
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| 378 | * @return string Filtered content through 'pre_kses' hook
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| 379 | */
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| 380 | function wp_kses_hook($string, $allowed_html, $allowed_protocols) {
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| 381 | $string = apply_filters('pre_kses', $string, $allowed_html, $allowed_protocols);
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| 382 | return $string;
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| 383 | }
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| 384 |
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| 385 | /**
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| 386 | * This function returns kses' version number.
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| 387 | *
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| 388 | * @since 1.0.0
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| 389 | *
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| 390 | * @return string KSES Version Number
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| 391 | */
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| 392 | function wp_kses_version() {
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| 393 | return '0.2.2';
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| 394 | }
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| 395 |
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| 396 | /**
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| 397 | * Searches for HTML tags, no matter how malformed.
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| 398 | *
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| 399 | * It also matches stray ">" characters.
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| 400 | *
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| 401 | * @since 1.0.0
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| 402 | *
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| 403 | * @param string $string Content to filter
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| 404 | * @param array $allowed_html Allowed HTML elements
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| 405 | * @param array $allowed_protocols Allowed protocols to keep
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| 406 | * @return string Content with fixed HTML tags
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| 407 | */
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| 408 | function wp_kses_split($string, $allowed_html, $allowed_protocols) {
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| 409 | global $pass_allowed_html, $pass_allowed_protocols;
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| 410 | $pass_allowed_html = $allowed_html;
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| 411 | $pass_allowed_protocols = $allowed_protocols;
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| 412 | return preg_replace_callback('%((<!--.*?(-->|$))|(<[^>]*(>|$)|>))%',
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| 413 | create_function('$match', 'global $pass_allowed_html, $pass_allowed_protocols; return wp_kses_split2($match[1], $pass_allowed_html, $pass_allowed_protocols);'), $string);
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| 414 | }
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| 415 |
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| 416 | /**
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| 417 | * Callback for wp_kses_split for fixing malformed HTML tags.
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| 418 | *
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| 419 | * This function does a lot of work. It rejects some very malformed things like
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| 420 | * <:::>. It returns an empty string, if the element isn't allowed (look ma, no
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| 421 | * strip_tags()!). Otherwise it splits the tag into an element and an attribute
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| 422 | * list.
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| 423 | *
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| 424 | * After the tag is split into an element and an attribute list, it is run
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| 425 | * through another filter which will remove illegal attributes and once that is
|
|---|
| 426 | * completed, will be returned.
|
|---|
| 427 | *
|
|---|
| 428 | * @access private
|
|---|
| 429 | * @since 1.0.0
|
|---|
| 430 | * @uses wp_kses_attr()
|
|---|
| 431 | *
|
|---|
| 432 | * @param string $string Content to filter
|
|---|
| 433 | * @param array $allowed_html Allowed HTML elements
|
|---|
| 434 | * @param array $allowed_protocols Allowed protocols to keep
|
|---|
| 435 | * @return string Fixed HTML element
|
|---|
| 436 | */
|
|---|
| 437 | function wp_kses_split2($string, $allowed_html, $allowed_protocols) {
|
|---|
| 438 | $string = wp_kses_stripslashes($string);
|
|---|
| 439 |
|
|---|
| 440 | if (substr($string, 0, 1) != '<')
|
|---|
| 441 | return '>';
|
|---|
| 442 | # It matched a ">" character
|
|---|
| 443 |
|
|---|
| 444 | if (preg_match('%^<!--(.*?)(-->)?$%', $string, $matches)) {
|
|---|
| 445 | $string = str_replace(array('<!--', '-->'), '', $matches[1]);
|
|---|
| 446 | while ( $string != $newstring = wp_kses($string, $allowed_html, $allowed_protocols) )
|
|---|
| 447 | $string = $newstring;
|
|---|
| 448 | if ( $string == '' )
|
|---|
| 449 | return '';
|
|---|
| 450 | // prevent multiple dashes in comments
|
|---|
| 451 | $string = preg_replace('/--+/', '-', $string);
|
|---|
| 452 | // prevent three dashes closing a comment
|
|---|
| 453 | $string = preg_replace('/-$/', '', $string);
|
|---|
| 454 | return "<!--{$string}-->";
|
|---|
| 455 | }
|
|---|
| 456 | # Allow HTML comments
|
|---|
| 457 |
|
|---|
| 458 | if (!preg_match('%^<\s*(/\s*)?([a-zA-Z0-9]+)([^>]*)>?$%', $string, $matches))
|
|---|
| 459 | return '';
|
|---|
| 460 | # It's seriously malformed
|
|---|
| 461 |
|
|---|
| 462 | $slash = trim($matches[1]);
|
|---|
| 463 | $elem = $matches[2];
|
|---|
| 464 | $attrlist = $matches[3];
|
|---|
| 465 |
|
|---|
| 466 | if (!@isset($allowed_html[strtolower($elem)]))
|
|---|
| 467 | return '';
|
|---|
| 468 | # They are using a not allowed HTML element
|
|---|
| 469 |
|
|---|
| 470 | if ($slash != '')
|
|---|
| 471 | return "<$slash$elem>";
|
|---|
| 472 | # No attributes are allowed for closing elements
|
|---|
| 473 |
|
|---|
| 474 | return wp_kses_attr("$slash$elem", $attrlist, $allowed_html, $allowed_protocols);
|
|---|
| 475 | }
|
|---|
| 476 |
|
|---|
| 477 | /**
|
|---|
| 478 | * Removes all attributes, if none are allowed for this element.
|
|---|
| 479 | *
|
|---|
| 480 | * If some are allowed it calls wp_kses_hair() to split them further, and then
|
|---|
| 481 | * it builds up new HTML code from the data that kses_hair() returns. It also
|
|---|
| 482 | * removes "<" and ">" characters, if there are any left. One more thing it does
|
|---|
| 483 | * is to check if the tag has a closing XHTML slash, and if it does, it puts one
|
|---|
| 484 | * in the returned code as well.
|
|---|
| 485 | *
|
|---|
| 486 | * @since 1.0.0
|
|---|
| 487 | *
|
|---|
| 488 | * @param string $element HTML element/tag
|
|---|
| 489 | * @param string $attr HTML attributes from HTML element to closing HTML element tag
|
|---|
| 490 | * @param array $allowed_html Allowed HTML elements
|
|---|
| 491 | * @param array $allowed_protocols Allowed protocols to keep
|
|---|
| 492 | * @return string Sanitized HTML element
|
|---|
| 493 | */
|
|---|
| 494 | function wp_kses_attr($element, $attr, $allowed_html, $allowed_protocols) {
|
|---|
| 495 | # Is there a closing XHTML slash at the end of the attributes?
|
|---|
| 496 |
|
|---|
| 497 | $xhtml_slash = '';
|
|---|
| 498 | if (preg_match('%\s/\s*$%', $attr))
|
|---|
| 499 | $xhtml_slash = ' /';
|
|---|
| 500 |
|
|---|
| 501 | # Are any attributes allowed at all for this element?
|
|---|
| 502 |
|
|---|
| 503 | if (@ count($allowed_html[strtolower($element)]) == 0)
|
|---|
| 504 | return "<$element$xhtml_slash>";
|
|---|
| 505 |
|
|---|
| 506 | # Split it
|
|---|
| 507 |
|
|---|
| 508 | $attrarr = wp_kses_hair($attr, $allowed_protocols);
|
|---|
| 509 |
|
|---|
| 510 | # Go through $attrarr, and save the allowed attributes for this element
|
|---|
| 511 | # in $attr2
|
|---|
| 512 |
|
|---|
| 513 | $attr2 = '';
|
|---|
| 514 |
|
|---|
| 515 | foreach ($attrarr as $arreach) {
|
|---|
| 516 | if (!@ isset ($allowed_html[strtolower($element)][strtolower($arreach['name'])]))
|
|---|
| 517 | continue; # the attribute is not allowed
|
|---|
| 518 |
|
|---|
| 519 | $current = $allowed_html[strtolower($element)][strtolower($arreach['name'])];
|
|---|
| 520 | if ($current == '')
|
|---|
| 521 | continue; # the attribute is not allowed
|
|---|
| 522 |
|
|---|
| 523 | if (!is_array($current))
|
|---|
| 524 | $attr2 .= ' '.$arreach['whole'];
|
|---|
| 525 | # there are no checks
|
|---|
| 526 |
|
|---|
| 527 | else {
|
|---|
| 528 | # there are some checks
|
|---|
| 529 | $ok = true;
|
|---|
| 530 | foreach ($current as $currkey => $currval)
|
|---|
| 531 | if (!wp_kses_check_attr_val($arreach['value'], $arreach['vless'], $currkey, $currval)) {
|
|---|
| 532 | $ok = false;
|
|---|
| 533 | break;
|
|---|
| 534 | }
|
|---|
| 535 |
|
|---|
| 536 | if ( $arreach['name'] == 'style' ) {
|
|---|
| 537 | $orig_value = $arreach['value'];
|
|---|
| 538 |
|
|---|
| 539 | $value = safecss_filter_attr($orig_value);
|
|---|
| 540 |
|
|---|
| 541 | if ( empty($value) )
|
|---|
| 542 | continue;
|
|---|
| 543 |
|
|---|
| 544 | $arreach['value'] = $value;
|
|---|
| 545 |
|
|---|
| 546 | $arreach['whole'] = str_replace($orig_value, $value, $arreach['whole']);
|
|---|
| 547 | }
|
|---|
| 548 |
|
|---|
| 549 | if ($ok)
|
|---|
| 550 | $attr2 .= ' '.$arreach['whole']; # it passed them
|
|---|
| 551 | } # if !is_array($current)
|
|---|
| 552 | } # foreach
|
|---|
| 553 |
|
|---|
| 554 | # Remove any "<" or ">" characters
|
|---|
| 555 |
|
|---|
| 556 | $attr2 = preg_replace('/[<>]/', '', $attr2);
|
|---|
| 557 |
|
|---|
| 558 | return "<$element$attr2$xhtml_slash>";
|
|---|
| 559 | }
|
|---|
| 560 |
|
|---|
| 561 | /**
|
|---|
| 562 | * Builds an attribute list from string containing attributes.
|
|---|
| 563 | *
|
|---|
| 564 | * This function does a lot of work. It parses an attribute list into an array
|
|---|
| 565 | * with attribute data, and tries to do the right thing even if it gets weird
|
|---|
| 566 | * input. It will add quotes around attribute values that don't have any quotes
|
|---|
| 567 | * or apostrophes around them, to make it easier to produce HTML code that will
|
|---|
| 568 | * conform to W3C's HTML specification. It will also remove bad URL protocols
|
|---|
| 569 | * from attribute values. It also reduces duplicate attributes by using the
|
|---|
| 570 | * attribute defined first (foo='bar' foo='baz' will result in foo='bar').
|
|---|
| 571 | *
|
|---|
| 572 | * @since 1.0.0
|
|---|
| 573 | *
|
|---|
| 574 | * @param string $attr Attribute list from HTML element to closing HTML element tag
|
|---|
| 575 | * @param array $allowed_protocols Allowed protocols to keep
|
|---|
| 576 | * @return array List of attributes after parsing
|
|---|
| 577 | */
|
|---|
| 578 | function wp_kses_hair($attr, $allowed_protocols) {
|
|---|
| 579 | $attrarr = array ();
|
|---|
| 580 | $mode = 0;
|
|---|
| 581 | $attrname = '';
|
|---|
| 582 | $uris = array('xmlns', 'profile', 'href', 'src', 'cite', 'classid', 'codebase', 'data', 'usemap', 'longdesc', 'action');
|
|---|
| 583 |
|
|---|
| 584 | # Loop through the whole attribute list
|
|---|
| 585 |
|
|---|
| 586 | while (strlen($attr) != 0) {
|
|---|
| 587 | $working = 0; # Was the last operation successful?
|
|---|
| 588 |
|
|---|
| 589 | switch ($mode) {
|
|---|
| 590 | case 0 : # attribute name, href for instance
|
|---|
| 591 |
|
|---|
| 592 | if (preg_match('/^([-a-zA-Z]+)/', $attr, $match)) {
|
|---|
| 593 | $attrname = $match[1];
|
|---|
| 594 | $working = $mode = 1;
|
|---|
| 595 | $attr = preg_replace('/^[-a-zA-Z]+/', '', $attr);
|
|---|
| 596 | }
|
|---|
| 597 |
|
|---|
| 598 | break;
|
|---|
| 599 |
|
|---|
| 600 | case 1 : # equals sign or valueless ("selected")
|
|---|
| 601 |
|
|---|
| 602 | if (preg_match('/^\s*=\s*/', $attr)) # equals sign
|
|---|
| 603 | {
|
|---|
| 604 | $working = 1;
|
|---|
| 605 | $mode = 2;
|
|---|
| 606 | $attr = preg_replace('/^\s*=\s*/', '', $attr);
|
|---|
| 607 | break;
|
|---|
| 608 | }
|
|---|
| 609 |
|
|---|
| 610 | if (preg_match('/^\s+/', $attr)) # valueless
|
|---|
| 611 | {
|
|---|
| 612 | $working = 1;
|
|---|
| 613 | $mode = 0;
|
|---|
| 614 | if(FALSE === array_key_exists($attrname, $attrarr)) {
|
|---|
| 615 | $attrarr[$attrname] = array ('name' => $attrname, 'value' => '', 'whole' => $attrname, 'vless' => 'y');
|
|---|
| 616 | }
|
|---|
| 617 | $attr = preg_replace('/^\s+/', '', $attr);
|
|---|
| 618 | }
|
|---|
| 619 |
|
|---|
| 620 | break;
|
|---|
| 621 |
|
|---|
| 622 | case 2 : # attribute value, a URL after href= for instance
|
|---|
| 623 |
|
|---|
| 624 | if (preg_match('/^"([^"]*)"(\s+|$)/', $attr, $match))
|
|---|
| 625 | # "value"
|
|---|
| 626 | {
|
|---|
| 627 | $thisval = $match[1];
|
|---|
| 628 | if ( in_array($attrname, $uris) )
|
|---|
| 629 | $thisval = wp_kses_bad_protocol($thisval, $allowed_protocols);
|
|---|
| 630 |
|
|---|
| 631 | if(FALSE === array_key_exists($attrname, $attrarr)) {
|
|---|
| 632 | $attrarr[$attrname] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname=\"$thisval\"", 'vless' => 'n');
|
|---|
| 633 | }
|
|---|
| 634 | $working = 1;
|
|---|
| 635 | $mode = 0;
|
|---|
| 636 | $attr = preg_replace('/^"[^"]*"(\s+|$)/', '', $attr);
|
|---|
| 637 | break;
|
|---|
| 638 | }
|
|---|
| 639 |
|
|---|
| 640 | if (preg_match("/^'([^']*)'(\s+|$)/", $attr, $match))
|
|---|
| 641 | # 'value'
|
|---|
| 642 | {
|
|---|
| 643 | $thisval = $match[1];
|
|---|
| 644 | if ( in_array($attrname, $uris) )
|
|---|
| 645 | $thisval = wp_kses_bad_protocol($thisval, $allowed_protocols);
|
|---|
| 646 |
|
|---|
| 647 | if(FALSE === array_key_exists($attrname, $attrarr)) {
|
|---|
| 648 | $attrarr[$attrname] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname='$thisval'", 'vless' => 'n');
|
|---|
| 649 | }
|
|---|
| 650 | $working = 1;
|
|---|
| 651 | $mode = 0;
|
|---|
| 652 | $attr = preg_replace("/^'[^']*'(\s+|$)/", '', $attr);
|
|---|
| 653 | break;
|
|---|
| 654 | }
|
|---|
| 655 |
|
|---|
| 656 | if (preg_match("%^([^\s\"']+)(\s+|$)%", $attr, $match))
|
|---|
| 657 | # value
|
|---|
| 658 | {
|
|---|
| 659 | $thisval = $match[1];
|
|---|
| 660 | if ( in_array($attrname, $uris) )
|
|---|
| 661 | $thisval = wp_kses_bad_protocol($thisval, $allowed_protocols);
|
|---|
| 662 |
|
|---|
| 663 | if(FALSE === array_key_exists($attrname, $attrarr)) {
|
|---|
| 664 | $attrarr[$attrname] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname=\"$thisval\"", 'vless' => 'n');
|
|---|
| 665 | }
|
|---|
| 666 | # We add quotes to conform to W3C's HTML spec.
|
|---|
| 667 | $working = 1;
|
|---|
| 668 | $mode = 0;
|
|---|
| 669 | $attr = preg_replace("%^[^\s\"']+(\s+|$)%", '', $attr);
|
|---|
| 670 | }
|
|---|
| 671 |
|
|---|
| 672 | break;
|
|---|
| 673 | } # switch
|
|---|
| 674 |
|
|---|
| 675 | if ($working == 0) # not well formed, remove and try again
|
|---|
| 676 | {
|
|---|
| 677 | $attr = wp_kses_html_error($attr);
|
|---|
| 678 | $mode = 0;
|
|---|
| 679 | }
|
|---|
| 680 | } # while
|
|---|
| 681 |
|
|---|
| 682 | if ($mode == 1 && FALSE === array_key_exists($attrname, $attrarr))
|
|---|
| 683 | # special case, for when the attribute list ends with a valueless
|
|---|
| 684 | # attribute like "selected"
|
|---|
| 685 | $attrarr[$attrname] = array ('name' => $attrname, 'value' => '', 'whole' => $attrname, 'vless' => 'y');
|
|---|
| 686 |
|
|---|
| 687 | return $attrarr;
|
|---|
| 688 | }
|
|---|
| 689 |
|
|---|
| 690 | /**
|
|---|
| 691 | * Performs different checks for attribute values.
|
|---|
| 692 | *
|
|---|
| 693 | * The currently implemented checks are "maxlen", "minlen", "maxval", "minval"
|
|---|
| 694 | * and "valueless" with even more checks to come soon.
|
|---|
| 695 | *
|
|---|
| 696 | * @since 1.0.0
|
|---|
| 697 | *
|
|---|
| 698 | * @param string $value Attribute value
|
|---|
| 699 | * @param string $vless Whether the value is valueless or not. Use 'y' or 'n'
|
|---|
| 700 | * @param string $checkname What $checkvalue is checking for.
|
|---|
| 701 | * @param mixed $checkvalue What constraint the value should pass
|
|---|
| 702 | * @return bool Whether check passes (true) or not (false)
|
|---|
| 703 | */
|
|---|
| 704 | function wp_kses_check_attr_val($value, $vless, $checkname, $checkvalue) {
|
|---|
| 705 | $ok = true;
|
|---|
| 706 |
|
|---|
| 707 | switch (strtolower($checkname)) {
|
|---|
| 708 | case 'maxlen' :
|
|---|
| 709 | # The maxlen check makes sure that the attribute value has a length not
|
|---|
| 710 | # greater than the given value. This can be used to avoid Buffer Overflows
|
|---|
| 711 | # in WWW clients and various Internet servers.
|
|---|
| 712 |
|
|---|
| 713 | if (strlen($value) > $checkvalue)
|
|---|
| 714 | $ok = false;
|
|---|
| 715 | break;
|
|---|
| 716 |
|
|---|
| 717 | case 'minlen' :
|
|---|
| 718 | # The minlen check makes sure that the attribute value has a length not
|
|---|
| 719 | # smaller than the given value.
|
|---|
| 720 |
|
|---|
| 721 | if (strlen($value) < $checkvalue)
|
|---|
| 722 | $ok = false;
|
|---|
| 723 | break;
|
|---|
| 724 |
|
|---|
| 725 | case 'maxval' :
|
|---|
| 726 | # The maxval check does two things: it checks that the attribute value is
|
|---|
| 727 | # an integer from 0 and up, without an excessive amount of zeroes or
|
|---|
| 728 | # whitespace (to avoid Buffer Overflows). It also checks that the attribute
|
|---|
| 729 | # value is not greater than the given value.
|
|---|
| 730 | # This check can be used to avoid Denial of Service attacks.
|
|---|
| 731 |
|
|---|
| 732 | if (!preg_match('/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value))
|
|---|
| 733 | $ok = false;
|
|---|
| 734 | if ($value > $checkvalue)
|
|---|
| 735 | $ok = false;
|
|---|
| 736 | break;
|
|---|
| 737 |
|
|---|
| 738 | case 'minval' :
|
|---|
| 739 | # The minval check checks that the attribute value is a positive integer,
|
|---|
| 740 | # and that it is not smaller than the given value.
|
|---|
| 741 |
|
|---|
| 742 | if (!preg_match('/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value))
|
|---|
| 743 | $ok = false;
|
|---|
| 744 | if ($value < $checkvalue)
|
|---|
| 745 | $ok = false;
|
|---|
| 746 | break;
|
|---|
| 747 |
|
|---|
| 748 | case 'valueless' :
|
|---|
| 749 | # The valueless check checks if the attribute has a value
|
|---|
| 750 | # (like <a href="blah">) or not (<option selected>). If the given value
|
|---|
| 751 | # is a "y" or a "Y", the attribute must not have a value.
|
|---|
| 752 | # If the given value is an "n" or an "N", the attribute must have one.
|
|---|
| 753 |
|
|---|
| 754 | if (strtolower($checkvalue) != $vless)
|
|---|
| 755 | $ok = false;
|
|---|
| 756 | break;
|
|---|
| 757 | } # switch
|
|---|
| 758 |
|
|---|
| 759 | return $ok;
|
|---|
| 760 | }
|
|---|
| 761 |
|
|---|
| 762 | /**
|
|---|
| 763 | * Sanitize string from bad protocols.
|
|---|
| 764 | *
|
|---|
| 765 | * This function removes all non-allowed protocols from the beginning of
|
|---|
| 766 | * $string. It ignores whitespace and the case of the letters, and it does
|
|---|
| 767 | * understand HTML entities. It does its work in a while loop, so it won't be
|
|---|
| 768 | * fooled by a string like "javascript:javascript:alert(57)".
|
|---|
| 769 | *
|
|---|
| 770 | * @since 1.0.0
|
|---|
| 771 | *
|
|---|
| 772 | * @param string $string Content to filter bad protocols from
|
|---|
| 773 | * @param array $allowed_protocols Allowed protocols to keep
|
|---|
| 774 | * @return string Filtered content
|
|---|
| 775 | */
|
|---|
| 776 | function wp_kses_bad_protocol($string, $allowed_protocols) {
|
|---|
| 777 | $string = wp_kses_no_null($string);
|
|---|
| 778 | $string = preg_replace('/\xad+/', '', $string); # deals with Opera "feature"
|
|---|
| 779 | $string2 = $string.'a';
|
|---|
| 780 |
|
|---|
| 781 | while ($string != $string2) {
|
|---|
| 782 | $string2 = $string;
|
|---|
| 783 | $string = wp_kses_bad_protocol_once($string, $allowed_protocols);
|
|---|
| 784 | } # while
|
|---|
| 785 |
|
|---|
| 786 | return $string;
|
|---|
| 787 | }
|
|---|
| 788 |
|
|---|
| 789 | /**
|
|---|
| 790 | * Removes any NULL characters in $string.
|
|---|
| 791 | *
|
|---|
| 792 | * @since 1.0.0
|
|---|
| 793 | *
|
|---|
| 794 | * @param string $string
|
|---|
| 795 | * @return string
|
|---|
| 796 | */
|
|---|
| 797 | function wp_kses_no_null($string) {
|
|---|
| 798 | $string = preg_replace('/\0+/', '', $string);
|
|---|
| 799 | $string = preg_replace('/(\\\\0)+/', '', $string);
|
|---|
| 800 |
|
|---|
| 801 | return $string;
|
|---|
| 802 | }
|
|---|
| 803 |
|
|---|
| 804 | /**
|
|---|
| 805 | * Strips slashes from in front of quotes.
|
|---|
| 806 | *
|
|---|
| 807 | * This function changes the character sequence \" to just ". It leaves all
|
|---|
| 808 | * other slashes alone. It's really weird, but the quoting from
|
|---|
| 809 | * preg_replace(//e) seems to require this.
|
|---|
| 810 | *
|
|---|
| 811 | * @since 1.0.0
|
|---|
| 812 | *
|
|---|
| 813 | * @param string $string String to strip slashes
|
|---|
| 814 | * @return string Fixed strings with quoted slashes
|
|---|
| 815 | */
|
|---|
| 816 | function wp_kses_stripslashes($string) {
|
|---|
| 817 | return preg_replace('%\\\\"%', '"', $string);
|
|---|
| 818 | }
|
|---|
| 819 |
|
|---|
| 820 | /**
|
|---|
| 821 | * Goes through an array and changes the keys to all lower case.
|
|---|
| 822 | *
|
|---|
| 823 | * @since 1.0.0
|
|---|
| 824 | *
|
|---|
| 825 | * @param array $inarray Unfiltered array
|
|---|
| 826 | * @return array Fixed array with all lowercase keys
|
|---|
| 827 | */
|
|---|
| 828 | function wp_kses_array_lc($inarray) {
|
|---|
| 829 | $outarray = array ();
|
|---|
| 830 |
|
|---|
| 831 | foreach ( (array) $inarray as $inkey => $inval) {
|
|---|
| 832 | $outkey = strtolower($inkey);
|
|---|
| 833 | $outarray[$outkey] = array ();
|
|---|
| 834 |
|
|---|
| 835 | foreach ( (array) $inval as $inkey2 => $inval2) {
|
|---|
| 836 | $outkey2 = strtolower($inkey2);
|
|---|
| 837 | $outarray[$outkey][$outkey2] = $inval2;
|
|---|
| 838 | } # foreach $inval
|
|---|
| 839 | } # foreach $inarray
|
|---|
| 840 |
|
|---|
| 841 | return $outarray;
|
|---|
| 842 | }
|
|---|
| 843 |
|
|---|
| 844 | /**
|
|---|
| 845 | * Removes the HTML JavaScript entities found in early versions of Netscape 4.
|
|---|
| 846 | *
|
|---|
| 847 | * @since 1.0.0
|
|---|
| 848 | *
|
|---|
| 849 | * @param string $string
|
|---|
| 850 | * @return string
|
|---|
| 851 | */
|
|---|
| 852 | function wp_kses_js_entities($string) {
|
|---|
| 853 | return preg_replace('%&\s*\{[^}]*(\}\s*;?|$)%', '', $string);
|
|---|
| 854 | }
|
|---|
| 855 |
|
|---|
| 856 | /**
|
|---|
| 857 | * Handles parsing errors in wp_kses_hair().
|
|---|
| 858 | *
|
|---|
| 859 | * The general plan is to remove everything to and including some whitespace,
|
|---|
| 860 | * but it deals with quotes and apostrophes as well.
|
|---|
| 861 | *
|
|---|
| 862 | * @since 1.0.0
|
|---|
| 863 | *
|
|---|
| 864 | * @param string $string
|
|---|
| 865 | * @return string
|
|---|
| 866 | */
|
|---|
| 867 | function wp_kses_html_error($string) {
|
|---|
| 868 | return preg_replace('/^("[^"]*("|$)|\'[^\']*(\'|$)|\S)*\s*/', '', $string);
|
|---|
| 869 | }
|
|---|
| 870 |
|
|---|
| 871 | /**
|
|---|
| 872 | * Sanitizes content from bad protocols and other characters.
|
|---|
| 873 | *
|
|---|
| 874 | * This function searches for URL protocols at the beginning of $string, while
|
|---|
| 875 | * handling whitespace and HTML entities.
|
|---|
| 876 | *
|
|---|
| 877 | * @since 1.0.0
|
|---|
| 878 | *
|
|---|
| 879 | * @param string $string Content to check for bad protocols
|
|---|
| 880 | * @param string $allowed_protocols Allowed protocols
|
|---|
| 881 | * @return string Sanitized content
|
|---|
| 882 | */
|
|---|
| 883 | function wp_kses_bad_protocol_once($string, $allowed_protocols) {
|
|---|
| 884 | global $_kses_allowed_protocols;
|
|---|
| 885 | $_kses_allowed_protocols = $allowed_protocols;
|
|---|
| 886 |
|
|---|
| 887 | $string2 = preg_split('/:|:|:/i', $string, 2);
|
|---|
| 888 | if ( isset($string2[1]) && !preg_match('%/\?%', $string2[0]) )
|
|---|
| 889 | $string = wp_kses_bad_protocol_once2($string2[0]) . trim($string2[1]);
|
|---|
| 890 | else
|
|---|
| 891 | $string = preg_replace_callback('/^((&[^;]*;|[\sA-Za-z0-9])*)'.'(:|:|&#[Xx]3[Aa];)\s*/', 'wp_kses_bad_protocol_once2', $string);
|
|---|
| 892 |
|
|---|
| 893 | return $string;
|
|---|
| 894 | }
|
|---|
| 895 |
|
|---|
| 896 | /**
|
|---|
| 897 | * Callback for wp_kses_bad_protocol_once() regular expression.
|
|---|
| 898 | *
|
|---|
| 899 | * This function processes URL protocols, checks to see if they're in the
|
|---|
| 900 | * white-list or not, and returns different data depending on the answer.
|
|---|
| 901 | *
|
|---|
| 902 | * @access private
|
|---|
| 903 | * @since 1.0.0
|
|---|
| 904 | *
|
|---|
| 905 | * @param mixed $matches string or preg_replace_callback() matches array to check for bad protocols
|
|---|
| 906 | * @return string Sanitized content
|
|---|
| 907 | */
|
|---|
| 908 | function wp_kses_bad_protocol_once2($matches) {
|
|---|
| 909 | global $_kses_allowed_protocols;
|
|---|
| 910 |
|
|---|
| 911 | if ( is_array($matches) ) {
|
|---|
| 912 | if ( ! isset($matches[1]) || empty($matches[1]) )
|
|---|
| 913 | return '';
|
|---|
| 914 |
|
|---|
| 915 | $string = $matches[1];
|
|---|
| 916 | } else {
|
|---|
| 917 | $string = $matches;
|
|---|
| 918 | }
|
|---|
| 919 |
|
|---|
| 920 | $string2 = wp_kses_decode_entities($string);
|
|---|
| 921 | $string2 = preg_replace('/\s/', '', $string2);
|
|---|
| 922 | $string2 = wp_kses_no_null($string2);
|
|---|
| 923 | $string2 = preg_replace('/\xad+/', '', $string2);
|
|---|
| 924 | # deals with Opera "feature"
|
|---|
| 925 | $string2 = strtolower($string2);
|
|---|
| 926 |
|
|---|
| 927 | $allowed = false;
|
|---|
| 928 | foreach ( (array) $_kses_allowed_protocols as $one_protocol)
|
|---|
| 929 | if (strtolower($one_protocol) == $string2) {
|
|---|
| 930 | $allowed = true;
|
|---|
| 931 | break;
|
|---|
| 932 | }
|
|---|
| 933 |
|
|---|
| 934 | if ($allowed)
|
|---|
| 935 | return "$string2:";
|
|---|
| 936 | else
|
|---|
| 937 | return '';
|
|---|
| 938 | }
|
|---|
| 939 |
|
|---|
| 940 | /**
|
|---|
| 941 | * Converts and fixes HTML entities.
|
|---|
| 942 | *
|
|---|
| 943 | * This function normalizes HTML entities. It will convert "AT&T" to the correct
|
|---|
| 944 | * "AT&T", ":" to ":", "&#XYZZY;" to "&#XYZZY;" and so on.
|
|---|
| 945 | *
|
|---|
| 946 | * @since 1.0.0
|
|---|
| 947 | *
|
|---|
| 948 | * @param string $string Content to normalize entities
|
|---|
| 949 | * @return string Content with normalized entities
|
|---|
| 950 | */
|
|---|
| 951 | function wp_kses_normalize_entities($string) {
|
|---|
| 952 | # Disarm all entities by converting & to &
|
|---|
| 953 |
|
|---|
| 954 | $string = str_replace('&', '&', $string);
|
|---|
| 955 |
|
|---|
| 956 | # Change back the allowed entities in our entity whitelist
|
|---|
| 957 |
|
|---|
| 958 | $string = preg_replace('/&([A-Za-z][A-Za-z0-9]{0,19});/', '&\\1;', $string);
|
|---|
| 959 | $string = preg_replace_callback('/&#0*([0-9]{1,5});/', 'wp_kses_normalize_entities2', $string);
|
|---|
| 960 | $string = preg_replace_callback('/&#([Xx])0*(([0-9A-Fa-f]{2}){1,2});/', 'wp_kses_normalize_entities3', $string);
|
|---|
| 961 |
|
|---|
| 962 | return $string;
|
|---|
| 963 | }
|
|---|
| 964 |
|
|---|
| 965 | /**
|
|---|
| 966 | * Callback for wp_kses_normalize_entities() regular expression.
|
|---|
| 967 | *
|
|---|
| 968 | * This function helps wp_kses_normalize_entities() to only accept 16 bit values
|
|---|
| 969 | * and nothing more for &#number; entities.
|
|---|
| 970 | *
|
|---|
| 971 | * @access private
|
|---|
| 972 | * @since 1.0.0
|
|---|
| 973 | *
|
|---|
| 974 | * @param array $matches preg_replace_callback() matches array
|
|---|
| 975 | * @return string Correctly encoded entity
|
|---|
| 976 | */
|
|---|
| 977 | function wp_kses_normalize_entities2($matches) {
|
|---|
| 978 | if ( ! isset($matches[1]) || empty($matches[1]) )
|
|---|
| 979 | return '';
|
|---|
| 980 |
|
|---|
| 981 | $i = $matches[1];
|
|---|
| 982 | return ( ( ! valid_unicode($i) ) || ($i > 65535) ? "&#$i;" : "&#$i;" );
|
|---|
| 983 | }
|
|---|
| 984 |
|
|---|
| 985 | /**
|
|---|
| 986 | * Callback for wp_kses_normalize_entities() for regular expression.
|
|---|
| 987 | *
|
|---|
| 988 | * This function helps wp_kses_normalize_entities() to only accept valid Unicode
|
|---|
| 989 | * numeric entities in hex form.
|
|---|
| 990 | *
|
|---|
| 991 | * @access private
|
|---|
| 992 | *
|
|---|
| 993 | * @param array $matches preg_replace_callback() matches array
|
|---|
| 994 | * @return string Correctly encoded entity
|
|---|
| 995 | */
|
|---|
| 996 | function wp_kses_normalize_entities3($matches) {
|
|---|
| 997 | if ( ! isset($matches[2]) || empty($matches[2]) )
|
|---|
| 998 | return '';
|
|---|
| 999 |
|
|---|
| 1000 | $hexchars = $matches[2];
|
|---|
| 1001 | return ( ( ! valid_unicode(hexdec($hexchars)) ) ? "&#x$hexchars;" : "&#x$hexchars;" );
|
|---|
| 1002 | }
|
|---|
| 1003 |
|
|---|
| 1004 | /**
|
|---|
| 1005 | * Helper function to determine if a Unicode value is valid.
|
|---|
| 1006 | *
|
|---|
| 1007 | * @param int $i Unicode value
|
|---|
| 1008 | * @return bool true if the value was a valid Unicode number
|
|---|
| 1009 | */
|
|---|
| 1010 | function valid_unicode($i) {
|
|---|
| 1011 | return ( $i == 0x9 || $i == 0xa || $i == 0xd ||
|
|---|
| 1012 | ($i >= 0x20 && $i <= 0xd7ff) ||
|
|---|
| 1013 | ($i >= 0xe000 && $i <= 0xfffd) ||
|
|---|
| 1014 | ($i >= 0x10000 && $i <= 0x10ffff) );
|
|---|
| 1015 | }
|
|---|
| 1016 |
|
|---|
| 1017 | /**
|
|---|
| 1018 | * Convert all entities to their character counterparts.
|
|---|
| 1019 | *
|
|---|
| 1020 | * This function decodes numeric HTML entities (A and A). It doesn't do
|
|---|
| 1021 | * anything with other entities like ä, but we don't need them in the URL
|
|---|
| 1022 | * protocol whitelisting system anyway.
|
|---|
| 1023 | *
|
|---|
| 1024 | * @since 1.0.0
|
|---|
| 1025 | *
|
|---|
| 1026 | * @param string $string Content to change entities
|
|---|
| 1027 | * @return string Content after decoded entities
|
|---|
| 1028 | */
|
|---|
| 1029 | function wp_kses_decode_entities($string) {
|
|---|
| 1030 | $string = preg_replace_callback('/&#([0-9]+);/', create_function('$match', 'return chr($match[1]);'), $string);
|
|---|
| 1031 | $string = preg_replace_callback('/&#[Xx]([0-9A-Fa-f]+);/', create_function('$match', 'return chr(hexdec($match[1]));'), $string);
|
|---|
| 1032 |
|
|---|
| 1033 | return $string;
|
|---|
| 1034 | }
|
|---|
| 1035 |
|
|---|
| 1036 | /**
|
|---|
| 1037 | * Sanitize content with allowed HTML Kses rules.
|
|---|
| 1038 | *
|
|---|
| 1039 | * @since 1.0.0
|
|---|
| 1040 | * @uses $allowedtags
|
|---|
| 1041 | *
|
|---|
| 1042 | * @param string $data Content to filter
|
|---|
| 1043 | * @return string Filtered content
|
|---|
| 1044 | */
|
|---|
| 1045 | function wp_filter_kses($data) {
|
|---|
| 1046 | global $allowedtags;
|
|---|
| 1047 | return addslashes( wp_kses(stripslashes( $data ), $allowedtags) );
|
|---|
| 1048 | }
|
|---|
| 1049 |
|
|---|
| 1050 | /**
|
|---|
| 1051 | * Sanitize content for allowed HTML tags for post content.
|
|---|
| 1052 | *
|
|---|
| 1053 | * Post content refers to the page contents of the 'post' type and not $_POST
|
|---|
| 1054 | * data from forms.
|
|---|
| 1055 | *
|
|---|
| 1056 | * @since 2.0.0
|
|---|
| 1057 | * @uses $allowedposttags
|
|---|
| 1058 | *
|
|---|
| 1059 | * @param string $data Post content to filter
|
|---|
| 1060 | * @return string Filtered post content with allowed HTML tags and attributes intact.
|
|---|
| 1061 | */
|
|---|
| 1062 | function wp_filter_post_kses($data) {
|
|---|
| 1063 | global $allowedposttags;
|
|---|
| 1064 | return addslashes ( wp_kses(stripslashes( $data ), $allowedposttags) );
|
|---|
| 1065 | }
|
|---|
| 1066 |
|
|---|
| 1067 | /**
|
|---|
| 1068 | * Strips all of the HTML in the content.
|
|---|
| 1069 | *
|
|---|
| 1070 | * @since 2.1.0
|
|---|
| 1071 | *
|
|---|
| 1072 | * @param string $data Content to strip all HTML from
|
|---|
| 1073 | * @return string Filtered content without any HTML
|
|---|
| 1074 | */
|
|---|
| 1075 | function wp_filter_nohtml_kses($data) {
|
|---|
| 1076 | return addslashes ( wp_kses(stripslashes( $data ), array()) );
|
|---|
| 1077 | }
|
|---|
| 1078 |
|
|---|
| 1079 | /**
|
|---|
| 1080 | * Adds all Kses input form content filters.
|
|---|
| 1081 | *
|
|---|
| 1082 | * All hooks have default priority. The wp_filter_kses() function is added to
|
|---|
| 1083 | * the 'pre_comment_content' and 'title_save_pre' hooks.
|
|---|
| 1084 | *
|
|---|
| 1085 | * The wp_filter_post_kses() function is added to the 'content_save_pre',
|
|---|
| 1086 | * 'excerpt_save_pre', and 'content_filtered_save_pre' hooks.
|
|---|
| 1087 | *
|
|---|
| 1088 | * @since 2.0.0
|
|---|
| 1089 | * @uses add_filter() See description for what functions are added to what hooks.
|
|---|
| 1090 | */
|
|---|
| 1091 | function kses_init_filters() {
|
|---|
| 1092 | // Normal filtering.
|
|---|
| 1093 | add_filter('pre_comment_content', 'wp_filter_kses');
|
|---|
| 1094 | add_filter('title_save_pre', 'wp_filter_kses');
|
|---|
| 1095 |
|
|---|
| 1096 | // Post filtering
|
|---|
| 1097 | add_filter('content_save_pre', 'wp_filter_post_kses');
|
|---|
| 1098 | add_filter('excerpt_save_pre', 'wp_filter_post_kses');
|
|---|
| 1099 | add_filter('content_filtered_save_pre', 'wp_filter_post_kses');
|
|---|
| 1100 | }
|
|---|
| 1101 |
|
|---|
| 1102 | /**
|
|---|
| 1103 | * Removes all Kses input form content filters.
|
|---|
| 1104 | *
|
|---|
| 1105 | * A quick procedural method to removing all of the filters that kses uses for
|
|---|
| 1106 | * content in WordPress Loop.
|
|---|
| 1107 | *
|
|---|
| 1108 | * Does not remove the kses_init() function from 'init' hook (priority is
|
|---|
| 1109 | * default). Also does not remove kses_init() function from 'set_current_user'
|
|---|
| 1110 | * hook (priority is also default).
|
|---|
| 1111 | *
|
|---|
| 1112 | * @since 2.0.6
|
|---|
| 1113 | */
|
|---|
| 1114 | function kses_remove_filters() {
|
|---|
| 1115 | // Normal filtering.
|
|---|
| 1116 | remove_filter('pre_comment_content', 'wp_filter_kses');
|
|---|
| 1117 | remove_filter('title_save_pre', 'wp_filter_kses');
|
|---|
| 1118 |
|
|---|
| 1119 | // Post filtering
|
|---|
| 1120 | remove_filter('content_save_pre', 'wp_filter_post_kses');
|
|---|
| 1121 | remove_filter('excerpt_save_pre', 'wp_filter_post_kses');
|
|---|
| 1122 | remove_filter('content_filtered_save_pre', 'wp_filter_post_kses');
|
|---|
| 1123 | }
|
|---|
| 1124 |
|
|---|
| 1125 | /**
|
|---|
| 1126 | * Sets up most of the Kses filters for input form content.
|
|---|
| 1127 | *
|
|---|
| 1128 | * If you remove the kses_init() function from 'init' hook and
|
|---|
| 1129 | * 'set_current_user' (priority is default), then none of the Kses filter hooks
|
|---|
| 1130 | * will be added.
|
|---|
| 1131 | *
|
|---|
| 1132 | * First removes all of the Kses filters in case the current user does not need
|
|---|
| 1133 | * to have Kses filter the content. If the user does not have unfiltered html
|
|---|
| 1134 | * capability, then Kses filters are added.
|
|---|
| 1135 | *
|
|---|
| 1136 | * @uses kses_remove_filters() Removes the Kses filters
|
|---|
| 1137 | * @uses kses_init_filters() Adds the Kses filters back if the user
|
|---|
| 1138 | * does not have unfiltered HTML capability.
|
|---|
| 1139 | * @since 2.0.0
|
|---|
| 1140 | */
|
|---|
| 1141 | function kses_init() {
|
|---|
| 1142 | kses_remove_filters();
|
|---|
| 1143 |
|
|---|
| 1144 | if (current_user_can('unfiltered_html') == false)
|
|---|
| 1145 | kses_init_filters();
|
|---|
| 1146 | }
|
|---|
| 1147 |
|
|---|
| 1148 | add_action('init', 'kses_init');
|
|---|
| 1149 | add_action('set_current_user', 'kses_init');
|
|---|
| 1150 |
|
|---|
| 1151 | function safecss_filter_attr( $css, $deprecated = '' ) {
|
|---|
| 1152 | $css = wp_kses_no_null($css);
|
|---|
| 1153 | $css = str_replace(array("\n","\r","\t"), '', $css);
|
|---|
| 1154 |
|
|---|
| 1155 | if ( preg_match( '%[\\(&]|/\*%', $css ) ) // remove any inline css containing \ ( & or comments
|
|---|
| 1156 | return '';
|
|---|
| 1157 |
|
|---|
| 1158 | $css_array = split( ';', trim( $css ) );
|
|---|
| 1159 | $allowed_attr = apply_filters( 'safe_style_css', array( 'text-align', 'margin', 'color', 'float',
|
|---|
| 1160 | 'border', 'background', 'background-color', 'border-bottom', 'border-bottom-color',
|
|---|
| 1161 | 'border-bottom-style', 'border-bottom-width', 'border-collapse', 'border-color', 'border-left',
|
|---|
| 1162 | 'border-left-color', 'border-left-style', 'border-left-width', 'border-right', 'border-right-color',
|
|---|
| 1163 | 'border-right-style', 'border-right-width', 'border-spacing', 'border-style', 'border-top',
|
|---|
| 1164 | 'border-top-color', 'border-top-style', 'border-top-width', 'border-width', 'caption-side',
|
|---|
| 1165 | 'clear', 'cursor', 'direction', 'font', 'font-family', 'font-size', 'font-style',
|
|---|
| 1166 | 'font-variant', 'font-weight', 'height', 'letter-spacing', 'line-height', 'margin-bottom',
|
|---|
| 1167 | 'margin-left', 'margin-right', 'margin-top', 'overflow', 'padding', 'padding-bottom',
|
|---|
| 1168 | 'padding-left', 'padding-right', 'padding-top', 'text-decoration', 'text-indent', 'vertical-align',
|
|---|
| 1169 | 'width' ) );
|
|---|
| 1170 |
|
|---|
| 1171 | if ( empty($allowed_attr) )
|
|---|
| 1172 | return $css;
|
|---|
| 1173 |
|
|---|
| 1174 | $css = '';
|
|---|
| 1175 | foreach ( $css_array as $css_item ) {
|
|---|
| 1176 | if ( $css_item == '' )
|
|---|
| 1177 | continue;
|
|---|
| 1178 | $css_item = trim( $css_item );
|
|---|
| 1179 | $found = false;
|
|---|
| 1180 | if ( strpos( $css_item, ':' ) === false ) {
|
|---|
| 1181 | $found = true;
|
|---|
| 1182 | } else {
|
|---|
| 1183 | $parts = split( ':', $css_item );
|
|---|
| 1184 | if ( in_array( trim( $parts[0] ), $allowed_attr ) )
|
|---|
| 1185 | $found = true;
|
|---|
| 1186 | }
|
|---|
| 1187 | if ( $found ) {
|
|---|
| 1188 | if( $css != '' )
|
|---|
| 1189 | $css .= ';';
|
|---|
| 1190 | $css .= $css_item;
|
|---|
| 1191 | }
|
|---|
| 1192 | }
|
|---|
| 1193 |
|
|---|
| 1194 | return $css;
|
|---|
| 1195 | }
|
|---|
