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