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PHP Cross Reference of WordPress MU 2.9.2Provided by Yoast |
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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 'id' => array (), 102 'lang' => array(), 103 'style' => array (), 104 'xml:lang' => array()), 105 'dl' => array(), 106 'dt' => array(), 107 'em' => array(), 108 'fieldset' => array(), 109 'font' => array( 110 'color' => array (), 111 'face' => array (), 112 'size' => array ()), 113 'form' => array( 114 'action' => array (), 115 'accept' => array (), 116 'accept-charset' => array (), 117 'enctype' => array (), 118 'method' => array (), 119 'name' => array (), 120 'target' => array ()), 121 'h1' => array( 122 'align' => array (), 123 'class' => array (), 124 'id' => array (), 125 'style' => array ()), 126 'h2' => array ( 127 'align' => array (), 128 'class' => array (), 129 'id' => array (), 130 'style' => array ()), 131 'h3' => array ( 132 'align' => array (), 133 'class' => array (), 134 'id' => array (), 135 'style' => array ()), 136 'h4' => array ( 137 'align' => array (), 138 'class' => array (), 139 'id' => array (), 140 'style' => array ()), 141 'h5' => array ( 142 'align' => array (), 143 'class' => array (), 144 'id' => array (), 145 'style' => array ()), 146 'h6' => array ( 147 'align' => array (), 148 'class' => array (), 149 'id' => array (), 150 'style' => array ()), 151 'hr' => array ( 152 'align' => array (), 153 'class' => array (), 154 'noshade' => array (), 155 'size' => array (), 156 'width' => array ()), 157 'i' => array(), 158 'img' => array( 159 'alt' => array (), 160 'align' => array (), 161 'border' => array (), 162 'class' => array (), 163 'height' => array (), 164 'hspace' => array (), 165 'longdesc' => array (), 166 'vspace' => array (), 167 'src' => array (), 168 'style' => array (), 169 'title' => array (), 170 'width' => array ()), 171 'ins' => array( 172 'datetime' => array (), 173 'cite' => array ()), 174 'kbd' => array(), 175 'label' => array( 176 'for' => array ()), 177 'legend' => array( 178 'align' => array ()), 179 'li' => array ( 180 'align' => array (), 181 'class' => array ()), 182 'p' => array( 183 'class' => array (), 184 'align' => array (), 185 'dir' => array(), 186 'lang' => array(), 187 'style' => array (), 188 'xml:lang' => array()), 189 'pre' => array( 190 'style' => array(), 191 'width' => array ()), 192 'q' => array( 193 'cite' => array ()), 194 's' => array(), 195 'span' => array ( 196 'class' => array (), 197 'dir' => array (), 198 'align' => array (), 199 'lang' => array (), 200 'style' => array (), 201 'title' => array (), 202 'xml:lang' => array()), 203 'strike' => array(), 204 'strong' => array(), 205 'sub' => array(), 206 'sup' => array(), 207 'table' => array( 208 'align' => array (), 209 'bgcolor' => array (), 210 'border' => array (), 211 'cellpadding' => array (), 212 'cellspacing' => array (), 213 'class' => array (), 214 'dir' => array(), 215 'id' => array(), 216 'rules' => array (), 217 'style' => array (), 218 'summary' => array (), 219 'width' => array ()), 220 'tbody' => array( 221 'align' => array (), 222 'char' => array (), 223 'charoff' => array (), 224 'valign' => array ()), 225 'td' => array( 226 'abbr' => array (), 227 'align' => array (), 228 'axis' => array (), 229 'bgcolor' => array (), 230 'char' => array (), 231 'charoff' => array (), 232 'class' => array (), 233 'colspan' => array (), 234 'dir' => array(), 235 'headers' => array (), 236 'height' => array (), 237 'nowrap' => array (), 238 'rowspan' => array (), 239 'scope' => array (), 240 'style' => array (), 241 'valign' => array (), 242 'width' => array ()), 243 'textarea' => array( 244 'cols' => array (), 245 'rows' => array (), 246 'disabled' => array (), 247 'name' => array (), 248 'readonly' => array ()), 249 'tfoot' => array( 250 'align' => array (), 251 'char' => array (), 252 'class' => array (), 253 'charoff' => array (), 254 'valign' => array ()), 255 'th' => array( 256 'abbr' => array (), 257 'align' => array (), 258 'axis' => array (), 259 'bgcolor' => array (), 260 'char' => array (), 261 'charoff' => array (), 262 'class' => array (), 263 'colspan' => array (), 264 'headers' => array (), 265 'height' => array (), 266 'nowrap' => array (), 267 'rowspan' => array (), 268 'scope' => array (), 269 'valign' => array (), 270 'width' => array ()), 271 'thead' => array( 272 'align' => array (), 273 'char' => array (), 274 'charoff' => array (), 275 'class' => array (), 276 'valign' => array ()), 277 'title' => array(), 278 'tr' => array( 279 'align' => array (), 280 'bgcolor' => array (), 281 'char' => array (), 282 'charoff' => array (), 283 'class' => array (), 284 'style' => array (), 285 'valign' => array ()), 286 'tt' => array(), 287 'u' => array(), 288 'ul' => array ( 289 'class' => array (), 290 'style' => array (), 291 'type' => array ()), 292 'ol' => array ( 293 'class' => array (), 294 'start' => array (), 295 'style' => array (), 296 'type' => array ()), 297 'var' => array ()); 298 299 /** 300 * Kses allowed HTML elements. 301 * 302 * @global array $allowedtags 303 * @since 1.0.0 304 */ 305 $allowedtags = array( 306 'a' => array( 307 'href' => array (), 308 'title' => array ()), 309 'abbr' => array( 310 'title' => array ()), 311 'acronym' => array( 312 'title' => array ()), 313 'b' => array(), 314 'blockquote' => array( 315 'cite' => array ()), 316 // 'br' => array(), 317 'cite' => array (), 318 'code' => array(), 319 'del' => array( 320 'datetime' => array ()), 321 // 'dd' => array(), 322 // 'dl' => array(), 323 // 'dt' => array(), 324 'em' => array (), 'i' => array (), 325 // 'ins' => array('datetime' => array(), 'cite' => array()), 326 // 'li' => array(), 327 // 'ol' => array(), 328 // 'p' => array(), 329 'q' => array( 330 'cite' => array ()), 331 'strike' => array(), 332 'strong' => array(), 333 // 'sub' => array(), 334 // 'sup' => array(), 335 // 'u' => array(), 336 // 'ul' => array(), 337 ); 338 } 339 340 /** 341 * Filters content and keeps only allowable HTML elements. 342 * 343 * This function makes sure that only the allowed HTML element names, attribute 344 * names and attribute values plus only sane HTML entities will occur in 345 * $string. You have to remove any slashes from PHP's magic quotes before you 346 * call this function. 347 * 348 * The default allowed protocols are 'http', 'https', 'ftp', 'mailto', 'news', 349 * 'irc', 'gopher', 'nntp', 'feed', and finally 'telnet. This covers all common 350 * link protocols, except for 'javascript' which should not be allowed for 351 * untrusted users. 352 * 353 * @since 1.0.0 354 * 355 * @param string $string Content to filter through kses 356 * @param array $allowed_html List of allowed HTML elements 357 * @param array $allowed_protocols Optional. Allowed protocol in links. 358 * @return string Filtered content with only allowed HTML elements 359 */ 360 function wp_kses($string, $allowed_html, $allowed_protocols = array ('http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet')) { 361 $string = wp_kses_no_null($string); 362 $string = wp_kses_js_entities($string); 363 $string = wp_kses_normalize_entities($string); 364 $allowed_html_fixed = wp_kses_array_lc($allowed_html); 365 $string = wp_kses_hook($string, $allowed_html_fixed, $allowed_protocols); // WP changed the order of these funcs and added args to wp_kses_hook 366 return wp_kses_split($string, $allowed_html_fixed, $allowed_protocols); 367 } 368 369 /** 370 * You add any kses hooks here. 371 * 372 * There is currently only one kses WordPress hook and it is called here. All 373 * parameters are passed to the hooks and expected to recieve a string. 374 * 375 * @since 1.0.0 376 * 377 * @param string $string Content to filter through kses 378 * @param array $allowed_html List of allowed HTML elements 379 * @param array $allowed_protocols Allowed protocol in links 380 * @return string Filtered content through 'pre_kses' hook 381 */ 382 function wp_kses_hook($string, $allowed_html, $allowed_protocols) { 383 $string = apply_filters('pre_kses', $string, $allowed_html, $allowed_protocols); 384 return $string; 385 } 386 387 /** 388 * This function returns kses' version number. 389 * 390 * @since 1.0.0 391 * 392 * @return string KSES Version Number 393 */ 394 function wp_kses_version() { 395 return '0.2.2'; 396 } 397 398 /** 399 * Searches for HTML tags, no matter how malformed. 400 * 401 * It also matches stray ">" characters. 402 * 403 * @since 1.0.0 404 * 405 * @param string $string Content to filter 406 * @param array $allowed_html Allowed HTML elements 407 * @param array $allowed_protocols Allowed protocols to keep 408 * @return string Content with fixed HTML tags 409 */ 410 function wp_kses_split($string, $allowed_html, $allowed_protocols) { 411 global $pass_allowed_html, $pass_allowed_protocols; 412 $pass_allowed_html = $allowed_html; 413 $pass_allowed_protocols = $allowed_protocols; 414 return preg_replace_callback('%((<!--.*?(-->|$))|(<[^>]*(>|$)|>))%', 415 create_function('$match', 'global $pass_allowed_html, $pass_allowed_protocols; return wp_kses_split2($match[1], $pass_allowed_html, $pass_allowed_protocols);'), $string); 416 } 417 418 /** 419 * Callback for wp_kses_split for fixing malformed HTML tags. 420 * 421 * This function does a lot of work. It rejects some very malformed things like 422 * <:::>. It returns an empty string, if the element isn't allowed (look ma, no 423 * strip_tags()!). Otherwise it splits the tag into an element and an attribute 424 * list. 425 * 426 * After the tag is split into an element and an attribute list, it is run 427 * through another filter which will remove illegal attributes and once that is 428 * completed, will be returned. 429 * 430 * @access private 431 * @since 1.0.0 432 * @uses wp_kses_attr() 433 * 434 * @param string $string Content to filter 435 * @param array $allowed_html Allowed HTML elements 436 * @param array $allowed_protocols Allowed protocols to keep 437 * @return string Fixed HTML element 438 */ 439 function wp_kses_split2($string, $allowed_html, $allowed_protocols) { 440 $string = wp_kses_stripslashes($string); 441 442 if (substr($string, 0, 1) != '<') 443 return '>'; 444 # It matched a ">" character 445 446 if (preg_match('%^<!--(.*?)(-->)?$%', $string, $matches)) { 447 $string = str_replace(array('<!--', '-->'), '', $matches[1]); 448 while ( $string != $newstring = wp_kses($string, $allowed_html, $allowed_protocols) ) 449 $string = $newstring; 450 if ( $string == '' ) 451 return ''; 452 // prevent multiple dashes in comments 453 $string = preg_replace('/--+/', '-', $string); 454 // prevent three dashes closing a comment 455 $string = preg_replace('/-$/', '', $string); 456 return "<!--{$string}-->"; 457 } 458 # Allow HTML comments 459 460 if (!preg_match('%^<\s*(/\s*)?([a-zA-Z0-9]+)([^>]*)>?$%', $string, $matches)) 461 return ''; 462 # It's seriously malformed 463 464 $slash = trim($matches[1]); 465 $elem = $matches[2]; 466 $attrlist = $matches[3]; 467 468 if (!@isset($allowed_html[strtolower($elem)])) 469 return ''; 470 # They are using a not allowed HTML element 471 472 if ($slash != '') 473 return "<$slash$elem>"; 474 # No attributes are allowed for closing elements 475 476 return wp_kses_attr("$slash$elem", $attrlist, $allowed_html, $allowed_protocols); 477 } 478 479 /** 480 * Removes all attributes, if none are allowed for this element. 481 * 482 * If some are allowed it calls wp_kses_hair() to split them further, and then 483 * it builds up new HTML code from the data that kses_hair() returns. It also 484 * removes "<" and ">" characters, if there are any left. One more thing it does 485 * is to check if the tag has a closing XHTML slash, and if it does, it puts one 486 * in the returned code as well. 487 * 488 * @since 1.0.0 489 * 490 * @param string $element HTML element/tag 491 * @param string $attr HTML attributes from HTML element to closing HTML element tag 492 * @param array $allowed_html Allowed HTML elements 493 * @param array $allowed_protocols Allowed protocols to keep 494 * @return string Sanitized HTML element 495 */ 496 function wp_kses_attr($element, $attr, $allowed_html, $allowed_protocols) { 497 # Is there a closing XHTML slash at the end of the attributes? 498 499 $xhtml_slash = ''; 500 if (preg_match('%\s/\s*$%', $attr)) 501 $xhtml_slash = ' /'; 502 503 # Are any attributes allowed at all for this element? 504 505 if (@ count($allowed_html[strtolower($element)]) == 0) 506 return "<$element$xhtml_slash>"; 507 508 # Split it 509 510 $attrarr = wp_kses_hair($attr, $allowed_protocols); 511 512 # Go through $attrarr, and save the allowed attributes for this element 513 # in $attr2 514 515 $attr2 = ''; 516 517 foreach ($attrarr as $arreach) { 518 if (!@ isset ($allowed_html[strtolower($element)][strtolower($arreach['name'])])) 519 continue; # the attribute is not allowed 520 521 $current = $allowed_html[strtolower($element)][strtolower($arreach['name'])]; 522 if ($current == '') 523 continue; # the attribute is not allowed 524 525 if (!is_array($current)) 526 $attr2 .= ' '.$arreach['whole']; 527 # there are no checks 528 529 else { 530 # there are some checks 531 $ok = true; 532 foreach ($current as $currkey => $currval) 533 if (!wp_kses_check_attr_val($arreach['value'], $arreach['vless'], $currkey, $currval)) { 534 $ok = false; 535 break; 536 } 537 538 if ( $arreach['name'] == 'style' ) { 539 $orig_value = $arreach['value']; 540 541 $value = safecss_filter_attr($orig_value); 542 543 if ( empty($value) ) 544 continue; 545 546 $arreach['value'] = $value; 547 548 $arreach['whole'] = str_replace($orig_value, $value, $arreach['whole']); 549 } 550 551 if ($ok) 552 $attr2 .= ' '.$arreach['whole']; # it passed them 553 } # if !is_array($current) 554 } # foreach 555 556 # Remove any "<" or ">" characters 557 558 $attr2 = preg_replace('/[<>]/', '', $attr2); 559 560 return "<$element$attr2$xhtml_slash>"; 561 } 562 563 /** 564 * Builds an attribute list from string containing attributes. 565 * 566 * This function does a lot of work. It parses an attribute list into an array 567 * with attribute data, and tries to do the right thing even if it gets weird 568 * input. It will add quotes around attribute values that don't have any quotes 569 * or apostrophes around them, to make it easier to produce HTML code that will 570 * conform to W3C's HTML specification. It will also remove bad URL protocols 571 * from attribute values. It also reduces duplicate attributes by using the 572 * attribute defined first (foo='bar' foo='baz' will result in foo='bar'). 573 * 574 * @since 1.0.0 575 * 576 * @param string $attr Attribute list from HTML element to closing HTML element tag 577 * @param array $allowed_protocols Allowed protocols to keep 578 * @return array List of attributes after parsing 579 */ 580 function wp_kses_hair($attr, $allowed_protocols) { 581 $attrarr = array (); 582 $mode = 0; 583 $attrname = ''; 584 $uris = array('xmlns', 'profile', 'href', 'src', 'cite', 'classid', 'codebase', 'data', 'usemap', 'longdesc', 'action'); 585 586 # Loop through the whole attribute list 587 588 while (strlen($attr) != 0) { 589 $working = 0; # Was the last operation successful? 590 591 switch ($mode) { 592 case 0 : # attribute name, href for instance 593 594 if (preg_match('/^([-a-zA-Z]+)/', $attr, $match)) { 595 $attrname = $match[1]; 596 $working = $mode = 1; 597 $attr = preg_replace('/^[-a-zA-Z]+/', '', $attr); 598 } 599 600 break; 601 602 case 1 : # equals sign or valueless ("selected") 603 604 if (preg_match('/^\s*=\s*/', $attr)) # equals sign 605 { 606 $working = 1; 607 $mode = 2; 608 $attr = preg_replace('/^\s*=\s*/', '', $attr); 609 break; 610 } 611 612 if (preg_match('/^\s+/', $attr)) # valueless 613 { 614 $working = 1; 615 $mode = 0; 616 if(FALSE === array_key_exists($attrname, $attrarr)) { 617 $attrarr[$attrname] = array ('name' => $attrname, 'value' => '', 'whole' => $attrname, 'vless' => 'y'); 618 } 619 $attr = preg_replace('/^\s+/', '', $attr); 620 } 621 622 break; 623 624 case 2 : # attribute value, a URL after href= for instance 625 626 if (preg_match('/^"([^"]*)"(\s+|$)/', $attr, $match)) 627 # "value" 628 { 629 $thisval = $match[1]; 630 if ( in_array($attrname, $uris) ) 631 $thisval = wp_kses_bad_protocol($thisval, $allowed_protocols); 632 633 if(FALSE === array_key_exists($attrname, $attrarr)) { 634 $attrarr[$attrname] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname=\"$thisval\"", 'vless' => 'n'); 635 } 636 $working = 1; 637 $mode = 0; 638 $attr = preg_replace('/^"[^"]*"(\s+|$)/', '', $attr); 639 break; 640 } 641 642 if (preg_match("/^'([^']*)'(\s+|$)/", $attr, $match)) 643 # 'value' 644 { 645 $thisval = $match[1]; 646 if ( in_array($attrname, $uris) ) 647 $thisval = wp_kses_bad_protocol($thisval, $allowed_protocols); 648 649 if(FALSE === array_key_exists($attrname, $attrarr)) { 650 $attrarr[$attrname] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname='$thisval'", 'vless' => 'n'); 651 } 652 $working = 1; 653 $mode = 0; 654 $attr = preg_replace("/^'[^']*'(\s+|$)/", '', $attr); 655 break; 656 } 657 658 if (preg_match("%^([^\s\"']+)(\s+|$)%", $attr, $match)) 659 # value 660 { 661 $thisval = $match[1]; 662 if ( in_array($attrname, $uris) ) 663 $thisval = wp_kses_bad_protocol($thisval, $allowed_protocols); 664 665 if(FALSE === array_key_exists($attrname, $attrarr)) { 666 $attrarr[$attrname] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname=\"$thisval\"", 'vless' => 'n'); 667 } 668 # We add quotes to conform to W3C's HTML spec. 669 $working = 1; 670 $mode = 0; 671 $attr = preg_replace("%^[^\s\"']+(\s+|$)%", '', $attr); 672 } 673 674 break; 675 } # switch 676 677 if ($working == 0) # not well formed, remove and try again 678 { 679 $attr = wp_kses_html_error($attr); 680 $mode = 0; 681 } 682 } # while 683 684 if ($mode == 1 && FALSE === array_key_exists($attrname, $attrarr)) 685 # special case, for when the attribute list ends with a valueless 686 # attribute like "selected" 687 $attrarr[$attrname] = array ('name' => $attrname, 'value' => '', 'whole' => $attrname, 'vless' => 'y'); 688 689 return $attrarr; 690 } 691 692 /** 693 * Performs different checks for attribute values. 694 * 695 * The currently implemented checks are "maxlen", "minlen", "maxval", "minval" 696 * and "valueless" with even more checks to come soon. 697 * 698 * @since 1.0.0 699 * 700 * @param string $value Attribute value 701 * @param string $vless Whether the value is valueless or not. Use 'y' or 'n' 702 * @param string $checkname What $checkvalue is checking for. 703 * @param mixed $checkvalue What constraint the value should pass 704 * @return bool Whether check passes (true) or not (false) 705 */ 706 function wp_kses_check_attr_val($value, $vless, $checkname, $checkvalue) { 707 $ok = true; 708 709 switch (strtolower($checkname)) { 710 case 'maxlen' : 711 # The maxlen check makes sure that the attribute value has a length not 712 # greater than the given value. This can be used to avoid Buffer Overflows 713 # in WWW clients and various Internet servers. 714 715 if (strlen($value) > $checkvalue) 716 $ok = false; 717 break; 718 719 case 'minlen' : 720 # The minlen check makes sure that the attribute value has a length not 721 # smaller than the given value. 722 723 if (strlen($value) < $checkvalue) 724 $ok = false; 725 break; 726 727 case 'maxval' : 728 # The maxval check does two things: it checks that the attribute value is 729 # an integer from 0 and up, without an excessive amount of zeroes or 730 # whitespace (to avoid Buffer Overflows). It also checks that the attribute 731 # value is not greater than the given value. 732 # This check can be used to avoid Denial of Service attacks. 733 734 if (!preg_match('/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value)) 735 $ok = false; 736 if ($value > $checkvalue) 737 $ok = false; 738 break; 739 740 case 'minval' : 741 # The minval check checks that the attribute value is a positive integer, 742 # and that it is not smaller than the given value. 743 744 if (!preg_match('/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value)) 745 $ok = false; 746 if ($value < $checkvalue) 747 $ok = false; 748 break; 749 750 case 'valueless' : 751 # The valueless check checks if the attribute has a value 752 # (like <a href="blah">) or not (<option selected>). If the given value 753 # is a "y" or a "Y", the attribute must not have a value. 754 # If the given value is an "n" or an "N", the attribute must have one. 755 756 if (strtolower($checkvalue) != $vless) 757 $ok = false; 758 break; 759 } # switch 760 761 return $ok; 762 } 763 764 /** 765 * Sanitize string from bad protocols. 766 * 767 * This function removes all non-allowed protocols from the beginning of 768 * $string. It ignores whitespace and the case of the letters, and it does 769 * understand HTML entities. It does its work in a while loop, so it won't be 770 * fooled by a string like "javascript:javascript:alert(57)". 771 * 772 * @since 1.0.0 773 * 774 * @param string $string Content to filter bad protocols from 775 * @param array $allowed_protocols Allowed protocols to keep 776 * @return string Filtered content 777 */ 778 function wp_kses_bad_protocol($string, $allowed_protocols) { 779 $string = wp_kses_no_null($string); 780 $string2 = $string.'a'; 781 782 while ($string != $string2) { 783 $string2 = $string; 784 $string = wp_kses_bad_protocol_once($string, $allowed_protocols); 785 } # while 786 787 return $string; 788 } 789 790 /** 791 * Removes any NULL characters in $string. 792 * 793 * @since 1.0.0 794 * 795 * @param string $string 796 * @return string 797 */ 798 function wp_kses_no_null($string) { 799 $string = preg_replace('/\0+/', '', $string); 800 $string = preg_replace('/(\\\\0)+/', '', $string); 801 802 return $string; 803 } 804 805 /** 806 * Strips slashes from in front of quotes. 807 * 808 * This function changes the character sequence \" to just ". It leaves all 809 * other slashes alone. It's really weird, but the quoting from 810 * preg_replace(//e) seems to require this. 811 * 812 * @since 1.0.0 813 * 814 * @param string $string String to strip slashes 815 * @return string Fixed strings with quoted slashes 816 */ 817 function wp_kses_stripslashes($string) { 818 return preg_replace('%\\\\"%', '"', $string); 819 } 820 821 /** 822 * Goes through an array and changes the keys to all lower case. 823 * 824 * @since 1.0.0 825 * 826 * @param array $inarray Unfiltered array 827 * @return array Fixed array with all lowercase keys 828 */ 829 function wp_kses_array_lc($inarray) { 830 $outarray = array (); 831 832 foreach ( (array) $inarray as $inkey => $inval) { 833 $outkey = strtolower($inkey); 834 $outarray[$outkey] = array (); 835 836 foreach ( (array) $inval as $inkey2 => $inval2) { 837 $outkey2 = strtolower($inkey2); 838 $outarray[$outkey][$outkey2] = $inval2; 839 } # foreach $inval 840 } # foreach $inarray 841 842 return $outarray; 843 } 844 845 /** 846 * Removes the HTML JavaScript entities found in early versions of Netscape 4. 847 * 848 * @since 1.0.0 849 * 850 * @param string $string 851 * @return string 852 */ 853 function wp_kses_js_entities($string) { 854 return preg_replace('%&\s*\{[^}]*(\}\s*;?|$)%', '', $string); 855 } 856 857 /** 858 * Handles parsing errors in wp_kses_hair(). 859 * 860 * The general plan is to remove everything to and including some whitespace, 861 * but it deals with quotes and apostrophes as well. 862 * 863 * @since 1.0.0 864 * 865 * @param string $string 866 * @return string 867 */ 868 function wp_kses_html_error($string) { 869 return preg_replace('/^("[^"]*("|$)|\'[^\']*(\'|$)|\S)*\s*/', '', $string); 870 } 871 872 /** 873 * Sanitizes content from bad protocols and other characters. 874 * 875 * This function searches for URL protocols at the beginning of $string, while 876 * handling whitespace and HTML entities. 877 * 878 * @since 1.0.0 879 * 880 * @param string $string Content to check for bad protocols 881 * @param string $allowed_protocols Allowed protocols 882 * @return string Sanitized content 883 */ 884 function wp_kses_bad_protocol_once($string, $allowed_protocols) { 885 global $_kses_allowed_protocols; 886 $_kses_allowed_protocols = $allowed_protocols; 887 888 $string2 = preg_split('/:|:|:/i', $string, 2); 889 if ( isset($string2[1]) && !preg_match('%/\?%', $string2[0]) ) 890 $string = wp_kses_bad_protocol_once2($string2[0]) . trim($string2[1]); 891 else 892 $string = preg_replace_callback('/^((&[^;]*;|[\sA-Za-z0-9])*)'.'(:|:|&#[Xx]3[Aa];)\s*/', 'wp_kses_bad_protocol_once2', $string); 893 894 return $string; 895 } 896 897 /** 898 * Callback for wp_kses_bad_protocol_once() regular expression. 899 * 900 * This function processes URL protocols, checks to see if they're in the 901 * white-list or not, and returns different data depending on the answer. 902 * 903 * @access private 904 * @since 1.0.0 905 * 906 * @param mixed $matches string or preg_replace_callback() matches array to check for bad protocols 907 * @return string Sanitized content 908 */ 909 function wp_kses_bad_protocol_once2($matches) { 910 global $_kses_allowed_protocols; 911 912 if ( is_array($matches) ) { 913 if ( ! isset($matches[1]) || empty($matches[1]) ) 914 return ''; 915 916 $string = $matches[1]; 917 } else { 918 $string = $matches; 919 } 920 921 $string2 = wp_kses_decode_entities($string); 922 $string2 = preg_replace('/\s/', '', $string2); 923 $string2 = wp_kses_no_null($string2); 924 $string2 = strtolower($string2); 925 926 $allowed = false; 927 foreach ( (array) $_kses_allowed_protocols as $one_protocol) 928 if (strtolower($one_protocol) == $string2) { 929 $allowed = true; 930 break; 931 } 932 933 if ($allowed) 934 return "$string2:"; 935 else 936 return ''; 937 } 938 939 /** 940 * Converts and fixes HTML entities. 941 * 942 * This function normalizes HTML entities. It will convert "AT&T" to the correct 943 * "AT&T", ":" to ":", "&#XYZZY;" to "&#XYZZY;" and so on. 944 * 945 * @since 1.0.0 946 * 947 * @param string $string Content to normalize entities 948 * @return string Content with normalized entities 949 */ 950 function wp_kses_normalize_entities($string) { 951 # Disarm all entities by converting & to & 952 953 $string = str_replace('&', '&', $string); 954 955 # Change back the allowed entities in our entity whitelist 956 957 $string = preg_replace('/&([A-Za-z][A-Za-z0-9]{0,19});/', '&\\1;', $string); 958 $string = preg_replace_callback('/&#0*([0-9]{1,5});/', 'wp_kses_normalize_entities2', $string); 959 $string = preg_replace_callback('/&#([Xx])0*(([0-9A-Fa-f]{2}){1,2});/', 'wp_kses_normalize_entities3', $string); 960 961 return $string; 962 } 963 964 /** 965 * Callback for wp_kses_normalize_entities() regular expression. 966 * 967 * This function helps wp_kses_normalize_entities() to only accept 16 bit values 968 * and nothing more for &#number; entities. 969 * 970 * @access private 971 * @since 1.0.0 972 * 973 * @param array $matches preg_replace_callback() matches array 974 * @return string Correctly encoded entity 975 */ 976 function wp_kses_normalize_entities2($matches) { 977 if ( ! isset($matches[1]) || empty($matches[1]) ) 978 return ''; 979 980 $i = $matches[1]; 981 return ( ( ! valid_unicode($i) ) || ($i > 65535) ? "&#$i;" : "&#$i;" ); 982 } 983 984 /** 985 * Callback for wp_kses_normalize_entities() for regular expression. 986 * 987 * This function helps wp_kses_normalize_entities() to only accept valid Unicode 988 * numeric entities in hex form. 989 * 990 * @access private 991 * 992 * @param array $matches preg_replace_callback() matches array 993 * @return string Correctly encoded entity 994 */ 995 function wp_kses_normalize_entities3($matches) { 996 if ( ! isset($matches[2]) || empty($matches[2]) ) 997 return ''; 998 999 $hexchars = $matches[2]; 1000 return ( ( ! valid_unicode(hexdec($hexchars)) ) ? "&#x$hexchars;" : "&#x$hexchars;" ); 1001 } 1002 1003 /** 1004 * Helper function to determine if a Unicode value is valid. 1005 * 1006 * @param int $i Unicode value 1007 * @return bool true if the value was a valid Unicode number 1008 */ 1009 function valid_unicode($i) { 1010 return ( $i == 0x9 || $i == 0xa || $i == 0xd || 1011 ($i >= 0x20 && $i <= 0xd7ff) || 1012 ($i >= 0xe000 && $i <= 0xfffd) || 1013 ($i >= 0x10000 && $i <= 0x10ffff) ); 1014 } 1015 1016 /** 1017 * Convert all entities to their character counterparts. 1018 * 1019 * This function decodes numeric HTML entities (A and A). It doesn't do 1020 * anything with other entities like ä, but we don't need them in the URL 1021 * protocol whitelisting system anyway. 1022 * 1023 * @since 1.0.0 1024 * 1025 * @param string $string Content to change entities 1026 * @return string Content after decoded entities 1027 */ 1028 function wp_kses_decode_entities($string) { 1029 $string = preg_replace_callback('/&#([0-9]+);/', '_wp_kses_decode_entities_chr', $string); 1030 $string = preg_replace_callback('/&#[Xx]([0-9A-Fa-f]+);/', '_wp_kses_decode_entities_chr_hexdec', $string); 1031 1032 return $string; 1033 } 1034 1035 /** 1036 * Regex callback for wp_kses_decode_entities() 1037 * 1038 * @param array $match preg match 1039 * @return string 1040 */ 1041 function _wp_kses_decode_entities_chr( $match ) { 1042 return chr( $match[1] ); 1043 } 1044 1045 /** 1046 * Regex callback for wp_kses_decode_entities() 1047 * 1048 * @param array $match preg match 1049 * @return string 1050 */ 1051 function _wp_kses_decode_entities_chr_hexdec( $match ) { 1052 return chr( hexdec( $match[1] ) ); 1053 } 1054 1055 /** 1056 * Sanitize content with allowed HTML Kses rules. 1057 * 1058 * @since 1.0.0 1059 * @uses $allowedtags 1060 * 1061 * @param string $data Content to filter, expected to be escaped with slashes 1062 * @return string Filtered content 1063 */ 1064 function wp_filter_kses($data) { 1065 global $allowedtags; 1066 return addslashes( wp_kses(stripslashes( $data ), $allowedtags) ); 1067 } 1068 1069 /** 1070 * Sanitize content with allowed HTML Kses rules. 1071 * 1072 * @since 2.9.0 1073 * @uses $allowedtags 1074 * 1075 * @param string $data Content to filter, expected to not be escaped 1076 * @return string Filtered content 1077 */ 1078 function wp_kses_data($data) { 1079 global $allowedtags; 1080 return wp_kses( $data , $allowedtags ); 1081 } 1082 1083 /** 1084 * Sanitize content for allowed HTML tags for post content. 1085 * 1086 * Post content refers to the page contents of the 'post' type and not $_POST 1087 * data from forms. 1088 * 1089 * @since 2.0.0 1090 * @uses $allowedposttags 1091 * 1092 * @param string $data Post content to filter, expected to be escaped with slashes 1093 * @return string Filtered post content with allowed HTML tags and attributes intact. 1094 */ 1095 function wp_filter_post_kses($data) { 1096 global $allowedposttags; 1097 return addslashes ( wp_kses(stripslashes( $data ), $allowedposttags) ); 1098 } 1099 1100 /** 1101 * Sanitize content for allowed HTML tags for post content. 1102 * 1103 * Post content refers to the page contents of the 'post' type and not $_POST 1104 * data from forms. 1105 * 1106 * @since 2.9.0 1107 * @uses $allowedposttags 1108 * 1109 * @param string $data Post content to filter 1110 * @return string Filtered post content with allowed HTML tags and attributes intact. 1111 */ 1112 function wp_kses_post($data) { 1113 global $allowedposttags; 1114 return wp_kses( $data , $allowedposttags ); 1115 } 1116 1117 /** 1118 * Strips all of the HTML in the content. 1119 * 1120 * @since 2.1.0 1121 * 1122 * @param string $data Content to strip all HTML from 1123 * @return string Filtered content without any HTML 1124 */ 1125 function wp_filter_nohtml_kses($data) { 1126 return addslashes ( wp_kses(stripslashes( $data ), array()) ); 1127 } 1128 1129 /** 1130 * Adds all Kses input form content filters. 1131 * 1132 * All hooks have default priority. The wp_filter_kses() function is added to 1133 * the 'pre_comment_content' and 'title_save_pre' hooks. 1134 * 1135 * The wp_filter_post_kses() function is added to the 'content_save_pre', 1136 * 'excerpt_save_pre', and 'content_filtered_save_pre' hooks. 1137 * 1138 * @since 2.0.0 1139 * @uses add_filter() See description for what functions are added to what hooks. 1140 */ 1141 function kses_init_filters() { 1142 // Normal filtering. 1143 add_filter('pre_comment_content', 'wp_filter_kses'); 1144 add_filter('title_save_pre', 'wp_filter_kses'); 1145 1146 // Post filtering 1147 add_filter('content_save_pre', 'wp_filter_post_kses'); 1148 add_filter('excerpt_save_pre', 'wp_filter_post_kses'); 1149 add_filter('content_filtered_save_pre', 'wp_filter_post_kses'); 1150 } 1151 1152 /** 1153 * Removes all Kses input form content filters. 1154 * 1155 * A quick procedural method to removing all of the filters that kses uses for 1156 * content in WordPress Loop. 1157 * 1158 * Does not remove the kses_init() function from 'init' hook (priority is 1159 * default). Also does not remove kses_init() function from 'set_current_user' 1160 * hook (priority is also default). 1161 * 1162 * @since 2.0.6 1163 */ 1164 function kses_remove_filters() { 1165 // Normal filtering. 1166 remove_filter('pre_comment_content', 'wp_filter_kses'); 1167 remove_filter('title_save_pre', 'wp_filter_kses'); 1168 1169 // Post filtering 1170 remove_filter('content_save_pre', 'wp_filter_post_kses'); 1171 remove_filter('excerpt_save_pre', 'wp_filter_post_kses'); 1172 remove_filter('content_filtered_save_pre', 'wp_filter_post_kses'); 1173 } 1174 1175 /** 1176 * Sets up most of the Kses filters for input form content. 1177 * 1178 * If you remove the kses_init() function from 'init' hook and 1179 * 'set_current_user' (priority is default), then none of the Kses filter hooks 1180 * will be added. 1181 * 1182 * First removes all of the Kses filters in case the current user does not need 1183 * to have Kses filter the content. If the user does not have unfiltered html 1184 * capability, then Kses filters are added. 1185 * 1186 * @uses kses_remove_filters() Removes the Kses filters 1187 * @uses kses_init_filters() Adds the Kses filters back if the user 1188 * does not have unfiltered HTML capability. 1189 * @since 2.0.0 1190 */ 1191 function kses_init() { 1192 global $allowedposttags, $allowedtags; 1193 $allowedposttags = apply_filters( 'edit_allowedposttags', $allowedposttags ); 1194 $allowedtags = apply_filters( 'edit_allowedtags', $allowedtags ); 1195 kses_remove_filters(); 1196 1197 kses_init_filters(); 1198 } 1199 1200 add_action('init', 'kses_init'); 1201 add_action('set_current_user', 'kses_init'); 1202 1203 function safecss_filter_attr( $css, $deprecated = '' ) { 1204 $css = wp_kses_no_null($css); 1205 $css = str_replace(array("\n","\r","\t"), '', $css); 1206 1207 if ( preg_match( '%[\\(&]|/\*%', $css ) ) // remove any inline css containing \ ( & or comments 1208 return ''; 1209 1210 $css_array = split( ';', trim( $css ) ); 1211 $allowed_attr = apply_filters( 'safe_style_css', array( 'text-align', 'margin', 'color', 'float', 1212 'border', 'background', 'background-color', 'border-bottom', 'border-bottom-color', 1213 'border-bottom-style', 'border-bottom-width', 'border-collapse', 'border-color', 'border-left', 1214 'border-left-color', 'border-left-style', 'border-left-width', 'border-right', 'border-right-color', 1215 'border-right-style', 'border-right-width', 'border-spacing', 'border-style', 'border-top', 1216 'border-top-color', 'border-top-style', 'border-top-width', 'border-width', 'caption-side', 1217 'clear', 'cursor', 'direction', 'font', 'font-family', 'font-size', 'font-style', 1218 'font-variant', 'font-weight', 'height', 'letter-spacing', 'line-height', 'margin-bottom', 1219 'margin-left', 'margin-right', 'margin-top', 'overflow', 'padding', 'padding-bottom', 1220 'padding-left', 'padding-right', 'padding-top', 'text-decoration', 'text-indent', 'vertical-align', 1221 'width' ) ); 1222 1223 if ( empty($allowed_attr) ) 1224 return $css; 1225 1226 $css = ''; 1227 foreach ( $css_array as $css_item ) { 1228 if ( $css_item == '' ) 1229 continue; 1230 $css_item = trim( $css_item ); 1231 $found = false; 1232 if ( strpos( $css_item, ':' ) === false ) { 1233 $found = true; 1234 } else { 1235 $parts = split( ':', $css_item ); 1236 if ( in_array( trim( $parts[0] ), $allowed_attr ) ) 1237 $found = true; 1238 } 1239 if ( $found ) { 1240 if( $css != '' ) 1241 $css .= ';'; 1242 $css .= $css_item; 1243 } 1244 } 1245 1246 return $css; 1247 }
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| Generated: Mon May 3 12:25:32 2010 | Cross-referenced by PHPXref 0.7 |