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1 <?php 2 /** 3 * kses 0.2.2 - HTML/XHTML filter that only allows some elements and attributes 4 * Copyright (C) 2002, 2003, 2005 Ulf Harnhammar 5 * 6 * This program is free software and open source software; you can redistribute 7 * it and/or modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation; either version 2 of the License, 9 * or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 * more details. 15 * 16 * You should have received a copy of the GNU General Public License along 17 * with this program; if not, write to the Free Software Foundation, Inc., 18 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA 19 * http://www.gnu.org/licenses/gpl.html 20 * 21 * [kses strips evil scripts!] 22 * 23 * Added wp_ prefix to avoid conflicts with existing kses users 24 * 25 * @version 0.2.2 26 * @copyright (C) 2002, 2003, 2005 27 * @author Ulf Harnhammar <http://advogato.org/person/metaur/> 28 * 29 * @package External 30 * @subpackage KSES 31 */ 32 33 /** 34 * Specifies the default allowable HTML tags. 35 * 36 * Using `CUSTOM_TAGS` is not recommended and should be considered deprecated. The 37 * {@see 'wp_kses_allowed_html'} filter is more powerful and supplies context. 38 * 39 * @see wp_kses_allowed_html() 40 * @since 1.2.0 41 * 42 * @var array[]|false Array of default allowable HTML tags, or false to use the defaults. 43 */ 44 if ( ! defined( 'CUSTOM_TAGS' ) ) { 45 define( 'CUSTOM_TAGS', false ); 46 } 47 48 // Ensure that these variables are added to the global namespace 49 // (e.g. if using namespaces / autoload in the current PHP environment). 50 global $allowedposttags, $allowedtags, $allowedentitynames, $allowedxmlentitynames; 51 52 if ( ! CUSTOM_TAGS ) { 53 /** 54 * KSES global for default allowable HTML tags. 55 * 56 * Can be overridden with the `CUSTOM_TAGS` constant. 57 * 58 * @var array[] $allowedposttags Array of default allowable HTML tags. 59 * @since 2.0.0 60 */ 61 $allowedposttags = array( 62 'address' => array(), 63 'a' => array( 64 'href' => true, 65 'rel' => true, 66 'rev' => true, 67 'name' => true, 68 'target' => true, 69 'download' => array( 70 'valueless' => 'y', 71 ), 72 ), 73 'abbr' => array(), 74 'acronym' => array(), 75 'area' => array( 76 'alt' => true, 77 'coords' => true, 78 'href' => true, 79 'nohref' => true, 80 'shape' => true, 81 'target' => true, 82 ), 83 'article' => array( 84 'align' => true, 85 ), 86 'aside' => array( 87 'align' => true, 88 ), 89 'audio' => array( 90 'autoplay' => true, 91 'controls' => true, 92 'loop' => true, 93 'muted' => true, 94 'preload' => true, 95 'src' => true, 96 ), 97 'b' => array(), 98 'bdo' => array(), 99 'big' => array(), 100 'blockquote' => array( 101 'cite' => true, 102 ), 103 'br' => array(), 104 'button' => array( 105 'disabled' => true, 106 'name' => true, 107 'type' => true, 108 'value' => true, 109 ), 110 'caption' => array( 111 'align' => true, 112 ), 113 'cite' => array(), 114 'code' => array(), 115 'col' => array( 116 'align' => true, 117 'char' => true, 118 'charoff' => true, 119 'span' => true, 120 'valign' => true, 121 'width' => true, 122 ), 123 'colgroup' => array( 124 'align' => true, 125 'char' => true, 126 'charoff' => true, 127 'span' => true, 128 'valign' => true, 129 'width' => true, 130 ), 131 'del' => array( 132 'datetime' => true, 133 ), 134 'dd' => array(), 135 'dfn' => array(), 136 'details' => array( 137 'align' => true, 138 'open' => true, 139 ), 140 'div' => array( 141 'align' => true, 142 ), 143 'dl' => array(), 144 'dt' => array(), 145 'em' => array(), 146 'fieldset' => array(), 147 'figure' => array( 148 'align' => true, 149 ), 150 'figcaption' => array( 151 'align' => true, 152 ), 153 'font' => array( 154 'color' => true, 155 'face' => true, 156 'size' => true, 157 ), 158 'footer' => array( 159 'align' => true, 160 ), 161 'h1' => array( 162 'align' => true, 163 ), 164 'h2' => array( 165 'align' => true, 166 ), 167 'h3' => array( 168 'align' => true, 169 ), 170 'h4' => array( 171 'align' => true, 172 ), 173 'h5' => array( 174 'align' => true, 175 ), 176 'h6' => array( 177 'align' => true, 178 ), 179 'header' => array( 180 'align' => true, 181 ), 182 'hgroup' => array( 183 'align' => true, 184 ), 185 'hr' => array( 186 'align' => true, 187 'noshade' => true, 188 'size' => true, 189 'width' => true, 190 ), 191 'i' => array(), 192 'img' => array( 193 'alt' => true, 194 'align' => true, 195 'border' => true, 196 'height' => true, 197 'hspace' => true, 198 'loading' => true, 199 'longdesc' => true, 200 'vspace' => true, 201 'src' => true, 202 'usemap' => true, 203 'width' => true, 204 ), 205 'ins' => array( 206 'datetime' => true, 207 'cite' => true, 208 ), 209 'kbd' => array(), 210 'label' => array( 211 'for' => true, 212 ), 213 'legend' => array( 214 'align' => true, 215 ), 216 'li' => array( 217 'align' => true, 218 'value' => true, 219 ), 220 'main' => array( 221 'align' => true, 222 ), 223 'map' => array( 224 'name' => true, 225 ), 226 'mark' => array(), 227 'menu' => array( 228 'type' => true, 229 ), 230 'nav' => array( 231 'align' => true, 232 ), 233 'object' => array( 234 'data' => array( 235 'required' => true, 236 'value_callback' => '_wp_kses_allow_pdf_objects', 237 ), 238 'type' => array( 239 'required' => true, 240 'values' => array( 'application/pdf' ), 241 ), 242 ), 243 'p' => array( 244 'align' => true, 245 ), 246 'pre' => array( 247 'width' => true, 248 ), 249 'q' => array( 250 'cite' => true, 251 ), 252 'rb' => array(), 253 'rp' => array(), 254 'rt' => array(), 255 'rtc' => array(), 256 'ruby' => array(), 257 's' => array(), 258 'samp' => array(), 259 'span' => array( 260 'align' => true, 261 ), 262 'section' => array( 263 'align' => true, 264 ), 265 'small' => array(), 266 'strike' => array(), 267 'strong' => array(), 268 'sub' => array(), 269 'summary' => array( 270 'align' => true, 271 ), 272 'sup' => array(), 273 'table' => array( 274 'align' => true, 275 'bgcolor' => true, 276 'border' => true, 277 'cellpadding' => true, 278 'cellspacing' => true, 279 'rules' => true, 280 'summary' => true, 281 'width' => true, 282 ), 283 'tbody' => array( 284 'align' => true, 285 'char' => true, 286 'charoff' => true, 287 'valign' => true, 288 ), 289 'td' => array( 290 'abbr' => true, 291 'align' => true, 292 'axis' => true, 293 'bgcolor' => true, 294 'char' => true, 295 'charoff' => true, 296 'colspan' => true, 297 'headers' => true, 298 'height' => true, 299 'nowrap' => true, 300 'rowspan' => true, 301 'scope' => true, 302 'valign' => true, 303 'width' => true, 304 ), 305 'textarea' => array( 306 'cols' => true, 307 'rows' => true, 308 'disabled' => true, 309 'name' => true, 310 'readonly' => true, 311 ), 312 'tfoot' => array( 313 'align' => true, 314 'char' => true, 315 'charoff' => true, 316 'valign' => true, 317 ), 318 'th' => array( 319 'abbr' => true, 320 'align' => true, 321 'axis' => true, 322 'bgcolor' => true, 323 'char' => true, 324 'charoff' => true, 325 'colspan' => true, 326 'headers' => true, 327 'height' => true, 328 'nowrap' => true, 329 'rowspan' => true, 330 'scope' => true, 331 'valign' => true, 332 'width' => true, 333 ), 334 'thead' => array( 335 'align' => true, 336 'char' => true, 337 'charoff' => true, 338 'valign' => true, 339 ), 340 'title' => array(), 341 'tr' => array( 342 'align' => true, 343 'bgcolor' => true, 344 'char' => true, 345 'charoff' => true, 346 'valign' => true, 347 ), 348 'track' => array( 349 'default' => true, 350 'kind' => true, 351 'label' => true, 352 'src' => true, 353 'srclang' => true, 354 ), 355 'tt' => array(), 356 'u' => array(), 357 'ul' => array( 358 'type' => true, 359 ), 360 'ol' => array( 361 'start' => true, 362 'type' => true, 363 'reversed' => true, 364 ), 365 'var' => array(), 366 'video' => array( 367 'autoplay' => true, 368 'controls' => true, 369 'height' => true, 370 'loop' => true, 371 'muted' => true, 372 'playsinline' => true, 373 'poster' => true, 374 'preload' => true, 375 'src' => true, 376 'width' => true, 377 ), 378 ); 379 380 /** 381 * @var array[] $allowedtags Array of KSES allowed HTML elements. 382 * @since 1.0.0 383 */ 384 $allowedtags = array( 385 'a' => array( 386 'href' => true, 387 'title' => true, 388 ), 389 'abbr' => array( 390 'title' => true, 391 ), 392 'acronym' => array( 393 'title' => true, 394 ), 395 'b' => array(), 396 'blockquote' => array( 397 'cite' => true, 398 ), 399 'cite' => array(), 400 'code' => array(), 401 'del' => array( 402 'datetime' => true, 403 ), 404 'em' => array(), 405 'i' => array(), 406 'q' => array( 407 'cite' => true, 408 ), 409 's' => array(), 410 'strike' => array(), 411 'strong' => array(), 412 ); 413 414 /** 415 * @var string[] $allowedentitynames Array of KSES allowed HTML entity names. 416 * @since 1.0.0 417 */ 418 $allowedentitynames = array( 419 'nbsp', 420 'iexcl', 421 'cent', 422 'pound', 423 'curren', 424 'yen', 425 'brvbar', 426 'sect', 427 'uml', 428 'copy', 429 'ordf', 430 'laquo', 431 'not', 432 'shy', 433 'reg', 434 'macr', 435 'deg', 436 'plusmn', 437 'acute', 438 'micro', 439 'para', 440 'middot', 441 'cedil', 442 'ordm', 443 'raquo', 444 'iquest', 445 'Agrave', 446 'Aacute', 447 'Acirc', 448 'Atilde', 449 'Auml', 450 'Aring', 451 'AElig', 452 'Ccedil', 453 'Egrave', 454 'Eacute', 455 'Ecirc', 456 'Euml', 457 'Igrave', 458 'Iacute', 459 'Icirc', 460 'Iuml', 461 'ETH', 462 'Ntilde', 463 'Ograve', 464 'Oacute', 465 'Ocirc', 466 'Otilde', 467 'Ouml', 468 'times', 469 'Oslash', 470 'Ugrave', 471 'Uacute', 472 'Ucirc', 473 'Uuml', 474 'Yacute', 475 'THORN', 476 'szlig', 477 'agrave', 478 'aacute', 479 'acirc', 480 'atilde', 481 'auml', 482 'aring', 483 'aelig', 484 'ccedil', 485 'egrave', 486 'eacute', 487 'ecirc', 488 'euml', 489 'igrave', 490 'iacute', 491 'icirc', 492 'iuml', 493 'eth', 494 'ntilde', 495 'ograve', 496 'oacute', 497 'ocirc', 498 'otilde', 499 'ouml', 500 'divide', 501 'oslash', 502 'ugrave', 503 'uacute', 504 'ucirc', 505 'uuml', 506 'yacute', 507 'thorn', 508 'yuml', 509 'quot', 510 'amp', 511 'lt', 512 'gt', 513 'apos', 514 'OElig', 515 'oelig', 516 'Scaron', 517 'scaron', 518 'Yuml', 519 'circ', 520 'tilde', 521 'ensp', 522 'emsp', 523 'thinsp', 524 'zwnj', 525 'zwj', 526 'lrm', 527 'rlm', 528 'ndash', 529 'mdash', 530 'lsquo', 531 'rsquo', 532 'sbquo', 533 'ldquo', 534 'rdquo', 535 'bdquo', 536 'dagger', 537 'Dagger', 538 'permil', 539 'lsaquo', 540 'rsaquo', 541 'euro', 542 'fnof', 543 'Alpha', 544 'Beta', 545 'Gamma', 546 'Delta', 547 'Epsilon', 548 'Zeta', 549 'Eta', 550 'Theta', 551 'Iota', 552 'Kappa', 553 'Lambda', 554 'Mu', 555 'Nu', 556 'Xi', 557 'Omicron', 558 'Pi', 559 'Rho', 560 'Sigma', 561 'Tau', 562 'Upsilon', 563 'Phi', 564 'Chi', 565 'Psi', 566 'Omega', 567 'alpha', 568 'beta', 569 'gamma', 570 'delta', 571 'epsilon', 572 'zeta', 573 'eta', 574 'theta', 575 'iota', 576 'kappa', 577 'lambda', 578 'mu', 579 'nu', 580 'xi', 581 'omicron', 582 'pi', 583 'rho', 584 'sigmaf', 585 'sigma', 586 'tau', 587 'upsilon', 588 'phi', 589 'chi', 590 'psi', 591 'omega', 592 'thetasym', 593 'upsih', 594 'piv', 595 'bull', 596 'hellip', 597 'prime', 598 'Prime', 599 'oline', 600 'frasl', 601 'weierp', 602 'image', 603 'real', 604 'trade', 605 'alefsym', 606 'larr', 607 'uarr', 608 'rarr', 609 'darr', 610 'harr', 611 'crarr', 612 'lArr', 613 'uArr', 614 'rArr', 615 'dArr', 616 'hArr', 617 'forall', 618 'part', 619 'exist', 620 'empty', 621 'nabla', 622 'isin', 623 'notin', 624 'ni', 625 'prod', 626 'sum', 627 'minus', 628 'lowast', 629 'radic', 630 'prop', 631 'infin', 632 'ang', 633 'and', 634 'or', 635 'cap', 636 'cup', 637 'int', 638 'sim', 639 'cong', 640 'asymp', 641 'ne', 642 'equiv', 643 'le', 644 'ge', 645 'sub', 646 'sup', 647 'nsub', 648 'sube', 649 'supe', 650 'oplus', 651 'otimes', 652 'perp', 653 'sdot', 654 'lceil', 655 'rceil', 656 'lfloor', 657 'rfloor', 658 'lang', 659 'rang', 660 'loz', 661 'spades', 662 'clubs', 663 'hearts', 664 'diams', 665 'sup1', 666 'sup2', 667 'sup3', 668 'frac14', 669 'frac12', 670 'frac34', 671 'there4', 672 ); 673 674 /** 675 * @var string[] $allowedxmlentitynames Array of KSES allowed XML entity names. 676 * @since 5.5.0 677 */ 678 $allowedxmlentitynames = array( 679 'amp', 680 'lt', 681 'gt', 682 'apos', 683 'quot', 684 ); 685 686 $allowedposttags = array_map( '_wp_add_global_attributes', $allowedposttags ); 687 } else { 688 $allowedtags = wp_kses_array_lc( $allowedtags ); 689 $allowedposttags = wp_kses_array_lc( $allowedposttags ); 690 } 691 692 /** 693 * Filters text content and strips out disallowed HTML. 694 * 695 * This function makes sure that only the allowed HTML element names, attribute 696 * names, attribute values, and HTML entities will occur in the given text string. 697 * 698 * This function expects unslashed data. 699 * 700 * @see wp_kses_post() for specifically filtering post content and fields. 701 * @see wp_allowed_protocols() for the default allowed protocols in link URLs. 702 * 703 * @since 1.0.0 704 * 705 * @param string $string Text content to filter. 706 * @param array[]|string $allowed_html An array of allowed HTML elements and attributes, 707 * or a context name such as 'post'. See wp_kses_allowed_html() 708 * for the list of accepted context names. 709 * @param string[] $allowed_protocols Array of allowed URL protocols. 710 * @return string Filtered content containing only the allowed HTML. 711 */ 712 function wp_kses( $string, $allowed_html, $allowed_protocols = array() ) { 713 if ( empty( $allowed_protocols ) ) { 714 $allowed_protocols = wp_allowed_protocols(); 715 } 716 717 $string = wp_kses_no_null( $string, array( 'slash_zero' => 'keep' ) ); 718 $string = wp_kses_normalize_entities( $string ); 719 $string = wp_kses_hook( $string, $allowed_html, $allowed_protocols ); 720 721 return wp_kses_split( $string, $allowed_html, $allowed_protocols ); 722 } 723 724 /** 725 * Filters one HTML attribute and ensures its value is allowed. 726 * 727 * This function can escape data in some situations where `wp_kses()` must strip the whole attribute. 728 * 729 * @since 4.2.3 730 * 731 * @param string $string The 'whole' attribute, including name and value. 732 * @param string $element The HTML element name to which the attribute belongs. 733 * @return string Filtered attribute. 734 */ 735 function wp_kses_one_attr( $string, $element ) { 736 $uris = wp_kses_uri_attributes(); 737 $allowed_html = wp_kses_allowed_html( 'post' ); 738 $allowed_protocols = wp_allowed_protocols(); 739 $string = wp_kses_no_null( $string, array( 'slash_zero' => 'keep' ) ); 740 741 // Preserve leading and trailing whitespace. 742 $matches = array(); 743 preg_match( '/^\s*/', $string, $matches ); 744 $lead = $matches[0]; 745 preg_match( '/\s*$/', $string, $matches ); 746 $trail = $matches[0]; 747 if ( empty( $trail ) ) { 748 $string = substr( $string, strlen( $lead ) ); 749 } else { 750 $string = substr( $string, strlen( $lead ), -strlen( $trail ) ); 751 } 752 753 // Parse attribute name and value from input. 754 $split = preg_split( '/\s*=\s*/', $string, 2 ); 755 $name = $split[0]; 756 if ( count( $split ) == 2 ) { 757 $value = $split[1]; 758 759 // Remove quotes surrounding $value. 760 // Also guarantee correct quoting in $string for this one attribute. 761 if ( '' === $value ) { 762 $quote = ''; 763 } else { 764 $quote = $value[0]; 765 } 766 if ( '"' === $quote || "'" === $quote ) { 767 if ( substr( $value, -1 ) != $quote ) { 768 return ''; 769 } 770 $value = substr( $value, 1, -1 ); 771 } else { 772 $quote = '"'; 773 } 774 775 // Sanitize quotes, angle braces, and entities. 776 $value = esc_attr( $value ); 777 778 // Sanitize URI values. 779 if ( in_array( strtolower( $name ), $uris, true ) ) { 780 $value = wp_kses_bad_protocol( $value, $allowed_protocols ); 781 } 782 783 $string = "$name=$quote$value$quote"; 784 $vless = 'n'; 785 } else { 786 $value = ''; 787 $vless = 'y'; 788 } 789 790 // Sanitize attribute by name. 791 wp_kses_attr_check( $name, $value, $string, $vless, $element, $allowed_html ); 792 793 // Restore whitespace. 794 return $lead . $string . $trail; 795 } 796 797 /** 798 * Returns an array of allowed HTML tags and attributes for a given context. 799 * 800 * @since 3.5.0 801 * @since 5.0.1 `form` removed as allowable HTML tag. 802 * 803 * @global array $allowedposttags 804 * @global array $allowedtags 805 * @global array $allowedentitynames 806 * 807 * @param string|array $context The context for which to retrieve tags. Allowed values are 'post', 808 * 'strip', 'data', 'entities', or the name of a field filter such as 809 * 'pre_user_description', or an array of allowed HTML elements and attributes. 810 * @return array Array of allowed HTML tags and their allowed attributes. 811 */ 812 function wp_kses_allowed_html( $context = '' ) { 813 global $allowedposttags, $allowedtags, $allowedentitynames; 814 815 if ( is_array( $context ) ) { 816 // When `$context` is an array it's actually an array of allowed HTML elements and attributes. 817 $html = $context; 818 $context = 'explicit'; 819 820 /** 821 * Filters the HTML tags that are allowed for a given context. 822 * 823 * HTML tags and attribute names are case-insensitive in HTML but must be 824 * added to the KSES allow list in lowercase. An item added to the allow list 825 * in upper or mixed case will not recognized as permitted by KSES. 826 * 827 * @since 3.5.0 828 * 829 * @param array[] $html Allowed HTML tags. 830 * @param string $context Context name. 831 */ 832 return apply_filters( 'wp_kses_allowed_html', $html, $context ); 833 } 834 835 switch ( $context ) { 836 case 'post': 837 /** This filter is documented in wp-includes/kses.php */ 838 $tags = apply_filters( 'wp_kses_allowed_html', $allowedposttags, $context ); 839 840 // 5.0.1 removed the `<form>` tag, allow it if a filter is allowing it's sub-elements `<input>` or `<select>`. 841 if ( ! CUSTOM_TAGS && ! isset( $tags['form'] ) && ( isset( $tags['input'] ) || isset( $tags['select'] ) ) ) { 842 $tags = $allowedposttags; 843 844 $tags['form'] = array( 845 'action' => true, 846 'accept' => true, 847 'accept-charset' => true, 848 'enctype' => true, 849 'method' => true, 850 'name' => true, 851 'target' => true, 852 ); 853 854 /** This filter is documented in wp-includes/kses.php */ 855 $tags = apply_filters( 'wp_kses_allowed_html', $tags, $context ); 856 } 857 858 return $tags; 859 860 case 'user_description': 861 case 'pre_user_description': 862 $tags = $allowedtags; 863 $tags['a']['rel'] = true; 864 /** This filter is documented in wp-includes/kses.php */ 865 return apply_filters( 'wp_kses_allowed_html', $tags, $context ); 866 867 case 'strip': 868 /** This filter is documented in wp-includes/kses.php */ 869 return apply_filters( 'wp_kses_allowed_html', array(), $context ); 870 871 case 'entities': 872 /** This filter is documented in wp-includes/kses.php */ 873 return apply_filters( 'wp_kses_allowed_html', $allowedentitynames, $context ); 874 875 case 'data': 876 default: 877 /** This filter is documented in wp-includes/kses.php */ 878 return apply_filters( 'wp_kses_allowed_html', $allowedtags, $context ); 879 } 880 } 881 882 /** 883 * You add any KSES hooks here. 884 * 885 * There is currently only one KSES WordPress hook, {@see 'pre_kses'}, and it is called here. 886 * All parameters are passed to the hooks and expected to receive a string. 887 * 888 * @since 1.0.0 889 * 890 * @param string $string Content to filter through KSES. 891 * @param array[]|string $allowed_html An array of allowed HTML elements and attributes, 892 * or a context name such as 'post'. See wp_kses_allowed_html() 893 * for the list of accepted context names. 894 * @param string[] $allowed_protocols Array of allowed URL protocols. 895 * @return string Filtered content through {@see 'pre_kses'} hook. 896 */ 897 function wp_kses_hook( $string, $allowed_html, $allowed_protocols ) { 898 /** 899 * Filters content to be run through KSES. 900 * 901 * @since 2.3.0 902 * 903 * @param string $string Content to filter through KSES. 904 * @param array[]|string $allowed_html An array of allowed HTML elements and attributes, 905 * or a context name such as 'post'. See wp_kses_allowed_html() 906 * for the list of accepted context names. 907 * @param string[] $allowed_protocols Array of allowed URL protocols. 908 */ 909 return apply_filters( 'pre_kses', $string, $allowed_html, $allowed_protocols ); 910 } 911 912 /** 913 * Returns the version number of KSES. 914 * 915 * @since 1.0.0 916 * 917 * @return string KSES version number. 918 */ 919 function wp_kses_version() { 920 return '0.2.2'; 921 } 922 923 /** 924 * Searches for HTML tags, no matter how malformed. 925 * 926 * It also matches stray `>` characters. 927 * 928 * @since 1.0.0 929 * 930 * @global array[]|string $pass_allowed_html An array of allowed HTML elements and attributes, 931 * or a context name such as 'post'. 932 * @global string[] $pass_allowed_protocols Array of allowed URL protocols. 933 * 934 * @param string $string Content to filter. 935 * @param array[]|string $allowed_html An array of allowed HTML elements and attributes, 936 * or a context name such as 'post'. See wp_kses_allowed_html() 937 * for the list of accepted context names. 938 * @param string[] $allowed_protocols Array of allowed URL protocols. 939 * @return string Content with fixed HTML tags 940 */ 941 function wp_kses_split( $string, $allowed_html, $allowed_protocols ) { 942 global $pass_allowed_html, $pass_allowed_protocols; 943 944 $pass_allowed_html = $allowed_html; 945 $pass_allowed_protocols = $allowed_protocols; 946 947 return preg_replace_callback( '%(<!--.*?(-->|$))|(<[^>]*(>|$)|>)%', '_wp_kses_split_callback', $string ); 948 } 949 950 /** 951 * Returns an array of HTML attribute names whose value contains a URL. 952 * 953 * This function returns a list of all HTML attributes that must contain 954 * a URL according to the HTML specification. 955 * 956 * This list includes URI attributes both allowed and disallowed by KSES. 957 * 958 * @link https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes 959 * 960 * @since 5.0.1 961 * 962 * @return string[] HTML attribute names whose value contains a URL. 963 */ 964 function wp_kses_uri_attributes() { 965 $uri_attributes = array( 966 'action', 967 'archive', 968 'background', 969 'cite', 970 'classid', 971 'codebase', 972 'data', 973 'formaction', 974 'href', 975 'icon', 976 'longdesc', 977 'manifest', 978 'poster', 979 'profile', 980 'src', 981 'usemap', 982 'xmlns', 983 ); 984 985 /** 986 * Filters the list of attributes that are required to contain a URL. 987 * 988 * Use this filter to add any `data-` attributes that are required to be 989 * validated as a URL. 990 * 991 * @since 5.0.1 992 * 993 * @param string[] $uri_attributes HTML attribute names whose value contains a URL. 994 */ 995 $uri_attributes = apply_filters( 'wp_kses_uri_attributes', $uri_attributes ); 996 997 return $uri_attributes; 998 } 999 1000 /** 1001 * Callback for `wp_kses_split()`. 1002 * 1003 * @since 3.1.0 1004 * @access private 1005 * @ignore 1006 * 1007 * @global array[]|string $pass_allowed_html An array of allowed HTML elements and attributes, 1008 * or a context name such as 'post'. 1009 * @global string[] $pass_allowed_protocols Array of allowed URL protocols. 1010 * 1011 * @param array $match preg_replace regexp matches 1012 * @return string 1013 */ 1014 function _wp_kses_split_callback( $match ) { 1015 global $pass_allowed_html, $pass_allowed_protocols; 1016 1017 return wp_kses_split2( $match[0], $pass_allowed_html, $pass_allowed_protocols ); 1018 } 1019 1020 /** 1021 * Callback for `wp_kses_split()` for fixing malformed HTML tags. 1022 * 1023 * This function does a lot of work. It rejects some very malformed things like 1024 * `<:::>`. It returns an empty string, if the element isn't allowed (look ma, no 1025 * `strip_tags()`!). Otherwise it splits the tag into an element and an attribute 1026 * list. 1027 * 1028 * After the tag is split into an element and an attribute list, it is run 1029 * through another filter which will remove illegal attributes and once that is 1030 * completed, will be returned. 1031 * 1032 * @access private 1033 * @ignore 1034 * @since 1.0.0 1035 * 1036 * @param string $string Content to filter. 1037 * @param array[]|string $allowed_html An array of allowed HTML elements and attributes, 1038 * or a context name such as 'post'. See wp_kses_allowed_html() 1039 * for the list of accepted context names. 1040 * @param string[] $allowed_protocols Array of allowed URL protocols. 1041 * @return string Fixed HTML element 1042 */ 1043 function wp_kses_split2( $string, $allowed_html, $allowed_protocols ) { 1044 $string = wp_kses_stripslashes( $string ); 1045 1046 // It matched a ">" character. 1047 if ( '<' !== substr( $string, 0, 1 ) ) { 1048 return '>'; 1049 } 1050 1051 // Allow HTML comments. 1052 if ( '<!--' === substr( $string, 0, 4 ) ) { 1053 $string = str_replace( array( '<!--', '-->' ), '', $string ); 1054 while ( ( $newstring = wp_kses( $string, $allowed_html, $allowed_protocols ) ) != $string ) { 1055 $string = $newstring; 1056 } 1057 if ( '' === $string ) { 1058 return ''; 1059 } 1060 // Prevent multiple dashes in comments. 1061 $string = preg_replace( '/--+/', '-', $string ); 1062 // Prevent three dashes closing a comment. 1063 $string = preg_replace( '/-$/', '', $string ); 1064 return "<!--{$string}-->"; 1065 } 1066 1067 // It's seriously malformed. 1068 if ( ! preg_match( '%^<\s*(/\s*)?([a-zA-Z0-9-]+)([^>]*)>?$%', $string, $matches ) ) { 1069 return ''; 1070 } 1071 1072 $slash = trim( $matches[1] ); 1073 $elem = $matches[2]; 1074 $attrlist = $matches[3]; 1075 1076 if ( ! is_array( $allowed_html ) ) { 1077 $allowed_html = wp_kses_allowed_html( $allowed_html ); 1078 } 1079 1080 // They are using a not allowed HTML element. 1081 if ( ! isset( $allowed_html[ strtolower( $elem ) ] ) ) { 1082 return ''; 1083 } 1084 1085 // No attributes are allowed for closing elements. 1086 if ( '' !== $slash ) { 1087 return "</$elem>"; 1088 } 1089 1090 return wp_kses_attr( $elem, $attrlist, $allowed_html, $allowed_protocols ); 1091 } 1092 1093 /** 1094 * Removes all attributes, if none are allowed for this element. 1095 * 1096 * If some are allowed it calls `wp_kses_hair()` to split them further, and then 1097 * it builds up new HTML code from the data that `wp_kses_hair()` returns. It also 1098 * removes `<` and `>` characters, if there are any left. One more thing it does 1099 * is to check if the tag has a closing XHTML slash, and if it does, it puts one 1100 * in the returned code as well. 1101 * 1102 * An array of allowed values can be defined for attributes. If the attribute value 1103 * doesn't fall into the list, the attribute will be removed from the tag. 1104 * 1105 * Attributes can be marked as required. If a required attribute is not present, 1106 * KSES will remove all attributes from the tag. As KSES doesn't match opening and 1107 * closing tags, it's not possible to safely remove the tag itself, the safest 1108 * fallback is to strip all attributes from the tag, instead. 1109 * 1110 * @since 1.0.0 1111 * @since 5.9.0 Added support for an array of allowed values for attributes. 1112 * Added support for required attributes. 1113 * 1114 * @param string $element HTML element/tag. 1115 * @param string $attr HTML attributes from HTML element to closing HTML element tag. 1116 * @param array[]|string $allowed_html An array of allowed HTML elements and attributes, 1117 * or a context name such as 'post'. See wp_kses_allowed_html() 1118 * for the list of accepted context names. 1119 * @param string[] $allowed_protocols Array of allowed URL protocols. 1120 * @return string Sanitized HTML element. 1121 */ 1122 function wp_kses_attr( $element, $attr, $allowed_html, $allowed_protocols ) { 1123 if ( ! is_array( $allowed_html ) ) { 1124 $allowed_html = wp_kses_allowed_html( $allowed_html ); 1125 } 1126 1127 // Is there a closing XHTML slash at the end of the attributes? 1128 $xhtml_slash = ''; 1129 if ( preg_match( '%\s*/\s*$%', $attr ) ) { 1130 $xhtml_slash = ' /'; 1131 } 1132 1133 // Are any attributes allowed at all for this element? 1134 $element_low = strtolower( $element ); 1135 if ( empty( $allowed_html[ $element_low ] ) || true === $allowed_html[ $element_low ] ) { 1136 return "<$element$xhtml_slash>"; 1137 } 1138 1139 // Split it. 1140 $attrarr = wp_kses_hair( $attr, $allowed_protocols ); 1141 1142 // Check if there are attributes that are required. 1143 $required_attrs = array_filter( 1144 $allowed_html[ $element_low ], 1145 function( $required_attr_limits ) { 1146 return isset( $required_attr_limits['required'] ) && true === $required_attr_limits['required']; 1147 } 1148 ); 1149 1150 /* 1151 * If a required attribute check fails, we can return nothing for a self-closing tag, 1152 * but for a non-self-closing tag the best option is to return the element with attributes, 1153 * as KSES doesn't handle matching the relevant closing tag. 1154 */ 1155 $stripped_tag = ''; 1156 if ( empty( $xhtml_slash ) ) { 1157 $stripped_tag = "<$element>"; 1158 } 1159 1160 // Go through $attrarr, and save the allowed attributes for this element in $attr2. 1161 $attr2 = ''; 1162 foreach ( $attrarr as $arreach ) { 1163 // Check if this attribute is required. 1164 $required = isset( $required_attrs[ strtolower( $arreach['name'] ) ] ); 1165 1166 if ( wp_kses_attr_check( $arreach['name'], $arreach['value'], $arreach['whole'], $arreach['vless'], $element, $allowed_html ) ) { 1167 $attr2 .= ' ' . $arreach['whole']; 1168 1169 // If this was a required attribute, we can mark it as found. 1170 if ( $required ) { 1171 unset( $required_attrs[ strtolower( $arreach['name'] ) ] ); 1172 } 1173 } elseif ( $required ) { 1174 // This attribute was required, but didn't pass the check. The entire tag is not allowed. 1175 return $stripped_tag; 1176 } 1177 } 1178 1179 // If some required attributes weren't set, the entire tag is not allowed. 1180 if ( ! empty( $required_attrs ) ) { 1181 return $stripped_tag; 1182 } 1183 1184 // Remove any "<" or ">" characters. 1185 $attr2 = preg_replace( '/[<>]/', '', $attr2 ); 1186 1187 return "<$element$attr2$xhtml_slash>"; 1188 } 1189 1190 /** 1191 * Determines whether an attribute is allowed. 1192 * 1193 * @since 4.2.3 1194 * @since 5.0.0 Added support for `data-*` wildcard attributes. 1195 * 1196 * @param string $name The attribute name. Passed by reference. Returns empty string when not allowed. 1197 * @param string $value The attribute value. Passed by reference. Returns a filtered value. 1198 * @param string $whole The `name=value` input. Passed by reference. Returns filtered input. 1199 * @param string $vless Whether the attribute is valueless. Use 'y' or 'n'. 1200 * @param string $element The name of the element to which this attribute belongs. 1201 * @param array $allowed_html The full list of allowed elements and attributes. 1202 * @return bool Whether or not the attribute is allowed. 1203 */ 1204 function wp_kses_attr_check( &$name, &$value, &$whole, $vless, $element, $allowed_html ) { 1205 $name_low = strtolower( $name ); 1206 $element_low = strtolower( $element ); 1207 1208 if ( ! isset( $allowed_html[ $element_low ] ) ) { 1209 $name = ''; 1210 $value = ''; 1211 $whole = ''; 1212 return false; 1213 } 1214 1215 $allowed_attr = $allowed_html[ $element_low ]; 1216 1217 if ( ! isset( $allowed_attr[ $name_low ] ) || '' === $allowed_attr[ $name_low ] ) { 1218 /* 1219 * Allow `data-*` attributes. 1220 * 1221 * When specifying `$allowed_html`, the attribute name should be set as 1222 * `data-*` (not to be mixed with the HTML 4.0 `data` attribute, see 1223 * https://www.w3.org/TR/html40/struct/objects.html#adef-data). 1224 * 1225 * Note: the attribute name should only contain `A-Za-z0-9_-` chars, 1226 * double hyphens `--` are not accepted by WordPress. 1227 */ 1228 if ( strpos( $name_low, 'data-' ) === 0 && ! empty( $allowed_attr['data-*'] ) 1229 && preg_match( '/^data(?:-[a-z0-9_]+)+$/', $name_low, $match ) 1230 ) { 1231 /* 1232 * Add the whole attribute name to the allowed attributes and set any restrictions 1233 * for the `data-*` attribute values for the current element. 1234 */ 1235 $allowed_attr[ $match[0] ] = $allowed_attr['data-*']; 1236 } else { 1237 $name = ''; 1238 $value = ''; 1239 $whole = ''; 1240 return false; 1241 } 1242 } 1243 1244 if ( 'style' === $name_low ) { 1245 $new_value = safecss_filter_attr( $value ); 1246 1247 if ( empty( $new_value ) ) { 1248 $name = ''; 1249 $value = ''; 1250 $whole = ''; 1251 return false; 1252 } 1253 1254 $whole = str_replace( $value, $new_value, $whole ); 1255 $value = $new_value; 1256 } 1257 1258 if ( is_array( $allowed_attr[ $name_low ] ) ) { 1259 // There are some checks. 1260 foreach ( $allowed_attr[ $name_low ] as $currkey => $currval ) { 1261 if ( ! wp_kses_check_attr_val( $value, $vless, $currkey, $currval ) ) { 1262 $name = ''; 1263 $value = ''; 1264 $whole = ''; 1265 return false; 1266 } 1267 } 1268 } 1269 1270 return true; 1271 } 1272 1273 /** 1274 * Builds an attribute list from string containing attributes. 1275 * 1276 * This function does a lot of work. It parses an attribute list into an array 1277 * with attribute data, and tries to do the right thing even if it gets weird 1278 * input. It will add quotes around attribute values that don't have any quotes 1279 * or apostrophes around them, to make it easier to produce HTML code that will 1280 * conform to W3C's HTML specification. It will also remove bad URL protocols 1281 * from attribute values. It also reduces duplicate attributes by using the 1282 * attribute defined first (`foo='bar' foo='baz'` will result in `foo='bar'`). 1283 * 1284 * @since 1.0.0 1285 * 1286 * @param string $attr Attribute list from HTML element to closing HTML element tag. 1287 * @param string[] $allowed_protocols Array of allowed URL protocols. 1288 * @return array[] Array of attribute information after parsing. 1289 */ 1290 function wp_kses_hair( $attr, $allowed_protocols ) { 1291 $attrarr = array(); 1292 $mode = 0; 1293 $attrname = ''; 1294 $uris = wp_kses_uri_attributes(); 1295 1296 // Loop through the whole attribute list. 1297 1298 while ( strlen( $attr ) != 0 ) { 1299 $working = 0; // Was the last operation successful? 1300 1301 switch ( $mode ) { 1302 case 0: 1303 if ( preg_match( '/^([_a-zA-Z][-_a-zA-Z0-9:.]*)/', $attr, $match ) ) { 1304 $attrname = $match[1]; 1305 $working = 1; 1306 $mode = 1; 1307 $attr = preg_replace( '/^[_a-zA-Z][-_a-zA-Z0-9:.]*/', '', $attr ); 1308 } 1309 1310 break; 1311 1312 case 1: 1313 if ( preg_match( '/^\s*=\s*/', $attr ) ) { // Equals sign. 1314 $working = 1; 1315 $mode = 2; 1316 $attr = preg_replace( '/^\s*=\s*/', '', $attr ); 1317 break; 1318 } 1319 1320 if ( preg_match( '/^\s+/', $attr ) ) { // Valueless. 1321 $working = 1; 1322 $mode = 0; 1323 if ( false === array_key_exists( $attrname, $attrarr ) ) { 1324 $attrarr[ $attrname ] = array( 1325 'name' => $attrname, 1326 'value' => '', 1327 'whole' => $attrname, 1328 'vless' => 'y', 1329 ); 1330 } 1331 $attr = preg_replace( '/^\s+/', '', $attr ); 1332 } 1333 1334 break; 1335 1336 case 2: 1337 if ( preg_match( '%^"([^"]*)"(\s+|/?$)%', $attr, $match ) ) { 1338 // "value" 1339 $thisval = $match[1]; 1340 if ( in_array( strtolower( $attrname ), $uris, true ) ) { 1341 $thisval = wp_kses_bad_protocol( $thisval, $allowed_protocols ); 1342 } 1343 1344 if ( false === array_key_exists( $attrname, $attrarr ) ) { 1345 $attrarr[ $attrname ] = array( 1346 'name' => $attrname, 1347 'value' => $thisval, 1348 'whole' => "$attrname=\"$thisval\"", 1349 'vless' => 'n', 1350 ); 1351 } 1352 $working = 1; 1353 $mode = 0; 1354 $attr = preg_replace( '/^"[^"]*"(\s+|$)/', '', $attr ); 1355 break; 1356 } 1357 1358 if ( preg_match( "%^'([^']*)'(\s+|/?$)%", $attr, $match ) ) { 1359 // 'value' 1360 $thisval = $match[1]; 1361 if ( in_array( strtolower( $attrname ), $uris, true ) ) { 1362 $thisval = wp_kses_bad_protocol( $thisval, $allowed_protocols ); 1363 } 1364 1365 if ( false === array_key_exists( $attrname, $attrarr ) ) { 1366 $attrarr[ $attrname ] = array( 1367 'name' => $attrname, 1368 'value' => $thisval, 1369 'whole' => "$attrname='$thisval'", 1370 'vless' => 'n', 1371 ); 1372 } 1373 $working = 1; 1374 $mode = 0; 1375 $attr = preg_replace( "/^'[^']*'(\s+|$)/", '', $attr ); 1376 break; 1377 } 1378 1379 if ( preg_match( "%^([^\s\"']+)(\s+|/?$)%", $attr, $match ) ) { 1380 // value 1381 $thisval = $match[1]; 1382 if ( in_array( strtolower( $attrname ), $uris, true ) ) { 1383 $thisval = wp_kses_bad_protocol( $thisval, $allowed_protocols ); 1384 } 1385 1386 if ( false === array_key_exists( $attrname, $attrarr ) ) { 1387 $attrarr[ $attrname ] = array( 1388 'name' => $attrname, 1389 'value' => $thisval, 1390 'whole' => "$attrname=\"$thisval\"", 1391 'vless' => 'n', 1392 ); 1393 } 1394 // We add quotes to conform to W3C's HTML spec. 1395 $working = 1; 1396 $mode = 0; 1397 $attr = preg_replace( "%^[^\s\"']+(\s+|$)%", '', $attr ); 1398 } 1399 1400 break; 1401 } // End switch. 1402 1403 if ( 0 == $working ) { // Not well-formed, remove and try again. 1404 $attr = wp_kses_html_error( $attr ); 1405 $mode = 0; 1406 } 1407 } // End while. 1408 1409 if ( 1 == $mode && false === array_key_exists( $attrname, $attrarr ) ) { 1410 // Special case, for when the attribute list ends with a valueless 1411 // attribute like "selected". 1412 $attrarr[ $attrname ] = array( 1413 'name' => $attrname, 1414 'value' => '', 1415 'whole' => $attrname, 1416 'vless' => 'y', 1417 ); 1418 } 1419 1420 return $attrarr; 1421 } 1422 1423 /** 1424 * Finds all attributes of an HTML element. 1425 * 1426 * Does not modify input. May return "evil" output. 1427 * 1428 * Based on `wp_kses_split2()` and `wp_kses_attr()`. 1429 * 1430 * @since 4.2.3 1431 * 1432 * @param string $element HTML element. 1433 * @return array|false List of attributes found in the element. Returns false on failure. 1434 */ 1435 function wp_kses_attr_parse( $element ) { 1436 $valid = preg_match( '%^(<\s*)(/\s*)?([a-zA-Z0-9]+\s*)([^>]*)(>?)$%', $element, $matches ); 1437 if ( 1 !== $valid ) { 1438 return false; 1439 } 1440 1441 $begin = $matches[1]; 1442 $slash = $matches[2]; 1443 $elname = $matches[3]; 1444 $attr = $matches[4]; 1445 $end = $matches[5]; 1446 1447 if ( '' !== $slash ) { 1448 // Closing elements do not get parsed. 1449 return false; 1450 } 1451 1452 // Is there a closing XHTML slash at the end of the attributes? 1453 if ( 1 === preg_match( '%\s*/\s*$%', $attr, $matches ) ) { 1454 $xhtml_slash = $matches[0]; 1455 $attr = substr( $attr, 0, -strlen( $xhtml_slash ) ); 1456 } else { 1457 $xhtml_slash = ''; 1458 } 1459 1460 // Split it. 1461 $attrarr = wp_kses_hair_parse( $attr ); 1462 if ( false === $attrarr ) { 1463 return false; 1464 } 1465 1466 // Make sure all input is returned by adding front and back matter. 1467 array_unshift( $attrarr, $begin . $slash . $elname ); 1468 array_push( $attrarr, $xhtml_slash . $end ); 1469 1470 return $attrarr; 1471 } 1472 1473 /** 1474 * Builds an attribute list from string containing attributes. 1475 * 1476 * Does not modify input. May return "evil" output. 1477 * In case of unexpected input, returns false instead of stripping things. 1478 * 1479 * Based on `wp_kses_hair()` but does not return a multi-dimensional array. 1480 * 1481 * @since 4.2.3 1482 * 1483 * @param string $attr Attribute list from HTML element to closing HTML element tag. 1484 * @return array|false List of attributes found in $attr. Returns false on failure. 1485 */ 1486 function wp_kses_hair_parse( $attr ) { 1487 if ( '' === $attr ) { 1488 return array(); 1489 } 1490 1491 // phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound -- don't remove regex indentation 1492 $regex = 1493 '(?:' 1494 . '[_a-zA-Z][-_a-zA-Z0-9:.]*' // Attribute name. 1495 . '|' 1496 . '\[\[?[^\[\]]+\]\]?' // Shortcode in the name position implies unfiltered_html. 1497 . ')' 1498 . '(?:' // Attribute value. 1499 . '\s*=\s*' // All values begin with '='. 1500 . '(?:' 1501 . '"[^"]*"' // Double-quoted. 1502 . '|' 1503 . "'[^']*'" // Single-quoted. 1504 . '|' 1505 . '[^\s"\']+' // Non-quoted. 1506 . '(?:\s|$)' // Must have a space. 1507 . ')' 1508 . '|' 1509 . '(?:\s|$)' // If attribute has no value, space is required. 1510 . ')' 1511 . '\s*'; // Trailing space is optional except as mentioned above. 1512 // phpcs:enable 1513 1514 // Although it is possible to reduce this procedure to a single regexp, 1515 // we must run that regexp twice to get exactly the expected result. 1516 1517 $validation = "%^($regex)+$%"; 1518 $extraction = "%$regex%"; 1519 1520 if ( 1 === preg_match( $validation, $attr ) ) { 1521 preg_match_all( $extraction, $attr, $attrarr ); 1522 return $attrarr[0]; 1523 } else { 1524 return false; 1525 } 1526 } 1527 1528 /** 1529 * Performs different checks for attribute values. 1530 * 1531 * The currently implemented checks are "maxlen", "minlen", "maxval", "minval", 1532 * and "valueless". 1533 * 1534 * @since 1.0.0 1535 * 1536 * @param string $value Attribute value. 1537 * @param string $vless Whether the attribute is valueless. Use 'y' or 'n'. 1538 * @param string $checkname What $checkvalue is checking for. 1539 * @param mixed $checkvalue What constraint the value should pass. 1540 * @return bool Whether check passes. 1541 */ 1542 function wp_kses_check_attr_val( $value, $vless, $checkname, $checkvalue ) { 1543 $ok = true; 1544 1545 switch ( strtolower( $checkname ) ) { 1546 case 'maxlen': 1547 /* 1548 * The maxlen check makes sure that the attribute value has a length not 1549 * greater than the given value. This can be used to avoid Buffer Overflows 1550 * in WWW clients and various Internet servers. 1551 */ 1552 1553 if ( strlen( $value ) > $checkvalue ) { 1554 $ok = false; 1555 } 1556 break; 1557 1558 case 'minlen': 1559 /* 1560 * The minlen check makes sure that the attribute value has a length not 1561 * smaller than the given value. 1562 */ 1563 1564 if ( strlen( $value ) < $checkvalue ) { 1565 $ok = false; 1566 } 1567 break; 1568 1569 case 'maxval': 1570 /* 1571 * The maxval check does two things: it checks that the attribute value is 1572 * an integer from 0 and up, without an excessive amount of zeroes or 1573 * whitespace (to avoid Buffer Overflows). It also checks that the attribute 1574 * value is not greater than the given value. 1575 * This check can be used to avoid Denial of Service attacks. 1576 */ 1577 1578 if ( ! preg_match( '/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value ) ) { 1579 $ok = false; 1580 } 1581 if ( $value > $checkvalue ) { 1582 $ok = false; 1583 } 1584 break; 1585 1586 case 'minval': 1587 /* 1588 * The minval check makes sure that the attribute value is a positive integer, 1589 * and that it is not smaller than the given value. 1590 */ 1591 1592 if ( ! preg_match( '/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value ) ) { 1593 $ok = false; 1594 } 1595 if ( $value < $checkvalue ) { 1596 $ok = false; 1597 } 1598 break; 1599 1600 case 'valueless': 1601 /* 1602 * The valueless check makes sure if the attribute has a value 1603 * (like `<a href="blah">`) or not (`<option selected>`). If the given value 1604 * is a "y" or a "Y", the attribute must not have a value. 1605 * If the given value is an "n" or an "N", the attribute must have a value. 1606 */ 1607 1608 if ( strtolower( $checkvalue ) != $vless ) { 1609 $ok = false; 1610 } 1611 break; 1612 1613 case 'values': 1614 /* 1615 * The values check is used when you want to make sure that the attribute 1616 * has one of the given values. 1617 */ 1618 1619 if ( false === array_search( strtolower( $value ), $checkvalue, true ) ) { 1620 $ok = false; 1621 } 1622 break; 1623 1624 case 'value_callback': 1625 /* 1626 * The value_callback check is used when you want to make sure that the attribute 1627 * value is accepted by the callback function. 1628 */ 1629 1630 if ( ! call_user_func( $checkvalue, $value ) ) { 1631 $ok = false; 1632 } 1633 break; 1634 } // End switch. 1635 1636 return $ok; 1637 } 1638 1639 /** 1640 * Sanitizes a string and removed disallowed URL protocols. 1641 * 1642 * This function removes all non-allowed protocols from the beginning of the 1643 * string. It ignores whitespace and the case of the letters, and it does 1644 * understand HTML entities. It does its work recursively, so it won't be 1645 * fooled by a string like `javascript:javascript:alert(57)`. 1646 * 1647 * @since 1.0.0 1648 * 1649 * @param string $string Content to filter bad protocols from. 1650 * @param string[] $allowed_protocols Array of allowed URL protocols. 1651 * @return string Filtered content. 1652 */ 1653 function wp_kses_bad_protocol( $string, $allowed_protocols ) { 1654 $string = wp_kses_no_null( $string ); 1655 $iterations = 0; 1656 1657 do { 1658 $original_string = $string; 1659 $string = wp_kses_bad_protocol_once( $string, $allowed_protocols ); 1660 } while ( $original_string != $string && ++$iterations < 6 ); 1661 1662 if ( $original_string != $string ) { 1663 return ''; 1664 } 1665 1666 return $string; 1667 } 1668 1669 /** 1670 * Removes any invalid control characters in a text string. 1671 * 1672 * Also removes any instance of the `\0` string. 1673 * 1674 * @since 1.0.0 1675 * 1676 * @param string $string Content to filter null characters from. 1677 * @param array $options Set 'slash_zero' => 'keep' when '\0' is allowed. Default is 'remove'. 1678 * @return string Filtered content. 1679 */ 1680 function wp_kses_no_null( $string, $options = null ) { 1681 if ( ! isset( $options['slash_zero'] ) ) { 1682 $options = array( 'slash_zero' => 'remove' ); 1683 } 1684 1685 $string = preg_replace( '/[\x00-\x08\x0B\x0C\x0E-\x1F]/', '', $string ); 1686 if ( 'remove' === $options['slash_zero'] ) { 1687 $string = preg_replace( '/\\\\+0+/', '', $string ); 1688 } 1689 1690 return $string; 1691 } 1692 1693 /** 1694 * Strips slashes from in front of quotes. 1695 * 1696 * This function changes the character sequence `\"` to just `"`. It leaves all other 1697 * slashes alone. The quoting from `preg_replace(//e)` requires this. 1698 * 1699 * @since 1.0.0 1700 * 1701 * @param string $string String to strip slashes from. 1702 * @return string Fixed string with quoted slashes. 1703 */ 1704 function wp_kses_stripslashes( $string ) { 1705 return preg_replace( '%\\\\"%', '"', $string ); 1706 } 1707 1708 /** 1709 * Converts the keys of an array to lowercase. 1710 * 1711 * @since 1.0.0 1712 * 1713 * @param array $inarray Unfiltered array. 1714 * @return array Fixed array with all lowercase keys. 1715 */ 1716 function wp_kses_array_lc( $inarray ) { 1717 $outarray = array(); 1718 1719 foreach ( (array) $inarray as $inkey => $inval ) { 1720 $outkey = strtolower( $inkey ); 1721 $outarray[ $outkey ] = array(); 1722 1723 foreach ( (array) $inval as $inkey2 => $inval2 ) { 1724 $outkey2 = strtolower( $inkey2 ); 1725 $outarray[ $outkey ][ $outkey2 ] = $inval2; 1726 } 1727 } 1728 1729 return $outarray; 1730 } 1731 1732 /** 1733 * Handles parsing errors in `wp_kses_hair()`. 1734 * 1735 * The general plan is to remove everything to and including some whitespace, 1736 * but it deals with quotes and apostrophes as well. 1737 * 1738 * @since 1.0.0 1739 * 1740 * @param string $string 1741 * @return string 1742 */ 1743 function wp_kses_html_error( $string ) { 1744 return preg_replace( '/^("[^"]*("|$)|\'[^\']*(\'|$)|\S)*\s*/', '', $string ); 1745 } 1746 1747 /** 1748 * Sanitizes content from bad protocols and other characters. 1749 * 1750 * This function searches for URL protocols at the beginning of the string, while 1751 * handling whitespace and HTML entities. 1752 * 1753 * @since 1.0.0 1754 * 1755 * @param string $string Content to check for bad protocols. 1756 * @param string[] $allowed_protocols Array of allowed URL protocols. 1757 * @param int $count Depth of call recursion to this function. 1758 * @return string Sanitized content. 1759 */ 1760 function wp_kses_bad_protocol_once( $string, $allowed_protocols, $count = 1 ) { 1761 $string = preg_replace( '/(�*58(?![;0-9])|�*3a(?![;a-f0-9]))/i', '$1;', $string ); 1762 $string2 = preg_split( '/:|�*58;|�*3a;|:/i', $string, 2 ); 1763 if ( isset( $string2[1] ) && ! preg_match( '%/\?%', $string2[0] ) ) { 1764 $string = trim( $string2[1] ); 1765 $protocol = wp_kses_bad_protocol_once2( $string2[0], $allowed_protocols ); 1766 if ( 'feed:' === $protocol ) { 1767 if ( $count > 2 ) { 1768 return ''; 1769 } 1770 $string = wp_kses_bad_protocol_once( $string, $allowed_protocols, ++$count ); 1771 if ( empty( $string ) ) { 1772 return $string; 1773 } 1774 } 1775 $string = $protocol . $string; 1776 } 1777 1778 return $string; 1779 } 1780 1781 /** 1782 * Callback for `wp_kses_bad_protocol_once()` regular expression. 1783 * 1784 * This function processes URL protocols, checks to see if they're in the 1785 * list of allowed protocols or not, and returns different data depending 1786 * on the answer. 1787 * 1788 * @access private 1789 * @ignore 1790 * @since 1.0.0 1791 * 1792 * @param string $string URI scheme to check against the list of allowed protocols. 1793 * @param string[] $allowed_protocols Array of allowed URL protocols. 1794 * @return string Sanitized content. 1795 */ 1796 function wp_kses_bad_protocol_once2( $string, $allowed_protocols ) { 1797 $string2 = wp_kses_decode_entities( $string ); 1798 $string2 = preg_replace( '/\s/', '', $string2 ); 1799 $string2 = wp_kses_no_null( $string2 ); 1800 $string2 = strtolower( $string2 ); 1801 1802 $allowed = false; 1803 foreach ( (array) $allowed_protocols as $one_protocol ) { 1804 if ( strtolower( $one_protocol ) == $string2 ) { 1805 $allowed = true; 1806 break; 1807 } 1808 } 1809 1810 if ( $allowed ) { 1811 return "$string2:"; 1812 } else { 1813 return ''; 1814 } 1815 } 1816 1817 /** 1818 * Converts and fixes HTML entities. 1819 * 1820 * This function normalizes HTML entities. It will convert `AT&T` to the correct 1821 * `AT&T`, `:` to `:`, `&#XYZZY;` to `&#XYZZY;` and so on. 1822 * 1823 * When `$context` is set to 'xml', HTML entities are converted to their code points. For 1824 * example, `AT&T…&#XYZZY;` is converted to `AT&T…&#XYZZY;`. 1825 * 1826 * @since 1.0.0 1827 * @since 5.5.0 Added `$context` parameter. 1828 * 1829 * @param string $string Content to normalize entities. 1830 * @param string $context Context for normalization. Can be either 'html' or 'xml'. 1831 * Default 'html'. 1832 * @return string Content with normalized entities. 1833 */ 1834 function wp_kses_normalize_entities( $string, $context = 'html' ) { 1835 // Disarm all entities by converting & to & 1836 $string = str_replace( '&', '&', $string ); 1837 1838 // Change back the allowed entities in our list of allowed entities. 1839 if ( 'xml' === $context ) { 1840 $string = preg_replace_callback( '/&([A-Za-z]{2,8}[0-9]{0,2});/', 'wp_kses_xml_named_entities', $string ); 1841 } else { 1842 $string = preg_replace_callback( '/&([A-Za-z]{2,8}[0-9]{0,2});/', 'wp_kses_named_entities', $string ); 1843 } 1844 $string = preg_replace_callback( '/&#(0*[0-9]{1,7});/', 'wp_kses_normalize_entities2', $string ); 1845 $string = preg_replace_callback( '/&#[Xx](0*[0-9A-Fa-f]{1,6});/', 'wp_kses_normalize_entities3', $string ); 1846 1847 return $string; 1848 } 1849 1850 /** 1851 * Callback for `wp_kses_normalize_entities()` regular expression. 1852 * 1853 * This function only accepts valid named entity references, which are finite, 1854 * case-sensitive, and highly scrutinized by HTML and XML validators. 1855 * 1856 * @since 3.0.0 1857 * 1858 * @global array $allowedentitynames 1859 * 1860 * @param array $matches preg_replace_callback() matches array. 1861 * @return string Correctly encoded entity. 1862 */ 1863 function wp_kses_named_entities( $matches ) { 1864 global $allowedentitynames; 1865 1866 if ( empty( $matches[1] ) ) { 1867 return ''; 1868 } 1869 1870 $i = $matches[1]; 1871 return ( ! in_array( $i, $allowedentitynames, true ) ) ? "&$i;" : "&$i;"; 1872 } 1873 1874 /** 1875 * Callback for `wp_kses_normalize_entities()` regular expression. 1876 * 1877 * This function only accepts valid named entity references, which are finite, 1878 * case-sensitive, and highly scrutinized by XML validators. HTML named entity 1879 * references are converted to their code points. 1880 * 1881 * @since 5.5.0 1882 * 1883 * @global array $allowedentitynames 1884 * @global array $allowedxmlentitynames 1885 * 1886 * @param array $matches preg_replace_callback() matches array. 1887 * @return string Correctly encoded entity. 1888 */ 1889 function wp_kses_xml_named_entities( $matches ) { 1890 global $allowedentitynames, $allowedxmlentitynames; 1891 1892 if ( empty( $matches[1] ) ) { 1893 return ''; 1894 } 1895 1896 $i = $matches[1]; 1897 1898 if ( in_array( $i, $allowedxmlentitynames, true ) ) { 1899 return "&$i;"; 1900 } elseif ( in_array( $i, $allowedentitynames, true ) ) { 1901 return html_entity_decode( "&$i;", ENT_HTML5 ); 1902 } 1903 1904 return "&$i;"; 1905 } 1906 1907 /** 1908 * Callback for `wp_kses_normalize_entities()` regular expression. 1909 * 1910 * This function helps `wp_kses_normalize_entities()` to only accept 16-bit 1911 * values and nothing more for `&#number;` entities. 1912 * 1913 * @access private 1914 * @ignore 1915 * @since 1.0.0 1916 * 1917 * @param array $matches `preg_replace_callback()` matches array. 1918 * @return string Correctly encoded entity. 1919 */ 1920 function wp_kses_normalize_entities2( $matches ) { 1921 if ( empty( $matches[1] ) ) { 1922 return ''; 1923 } 1924 1925 $i = $matches[1]; 1926 if ( valid_unicode( $i ) ) { 1927 $i = str_pad( ltrim( $i, '0' ), 3, '0', STR_PAD_LEFT ); 1928 $i = "&#$i;"; 1929 } else { 1930 $i = "&#$i;"; 1931 } 1932 1933 return $i; 1934 } 1935 1936 /** 1937 * Callback for `wp_kses_normalize_entities()` for regular expression. 1938 * 1939 * This function helps `wp_kses_normalize_entities()` to only accept valid Unicode 1940 * numeric entities in hex form. 1941 * 1942 * @since 2.7.0 1943 * @access private 1944 * @ignore 1945 * 1946 * @param array $matches `preg_replace_callback()` matches array. 1947 * @return string Correctly encoded entity. 1948 */ 1949 function wp_kses_normalize_entities3( $matches ) { 1950 if ( empty( $matches[1] ) ) { 1951 return ''; 1952 } 1953 1954 $hexchars = $matches[1]; 1955 return ( ! valid_unicode( hexdec( $hexchars ) ) ) ? "&#x$hexchars;" : '&#x' . ltrim( $hexchars, '0' ) . ';'; 1956 } 1957 1958 /** 1959 * Determines if a Unicode codepoint is valid. 1960 * 1961 * @since 2.7.0 1962 * 1963 * @param int $i Unicode codepoint. 1964 * @return bool Whether or not the codepoint is a valid Unicode codepoint. 1965 */ 1966 function valid_unicode( $i ) { 1967 return ( 0x9 == $i || 0xa == $i || 0xd == $i || 1968 ( 0x20 <= $i && $i <= 0xd7ff ) || 1969 ( 0xe000 <= $i && $i <= 0xfffd ) || 1970 ( 0x10000 <= $i && $i <= 0x10ffff ) ); 1971 } 1972 1973 /** 1974 * Converts all numeric HTML entities to their named counterparts. 1975 * 1976 * This function decodes numeric HTML entities (`A` and `A`). 1977 * It doesn't do anything with named entities like `ä`, but we don't 1978 * need them in the allowed URL protocols system anyway. 1979 * 1980 * @since 1.0.0 1981 * 1982 * @param string $string Content to change entities. 1983 * @return string Content after decoded entities. 1984 */ 1985 function wp_kses_decode_entities( $string ) { 1986 $string = preg_replace_callback( '/&#([0-9]+);/', '_wp_kses_decode_entities_chr', $string ); 1987 $string = preg_replace_callback( '/&#[Xx]([0-9A-Fa-f]+);/', '_wp_kses_decode_entities_chr_hexdec', $string ); 1988 1989 return $string; 1990 } 1991 1992 /** 1993 * Regex callback for `wp_kses_decode_entities()`. 1994 * 1995 * @since 2.9.0 1996 * @access private 1997 * @ignore 1998 * 1999 * @param array $match preg match 2000 * @return string 2001 */ 2002 function _wp_kses_decode_entities_chr( $match ) { 2003 return chr( $match[1] ); 2004 } 2005 2006 /** 2007 * Regex callback for `wp_kses_decode_entities()`. 2008 * 2009 * @since 2.9.0 2010 * @access private 2011 * @ignore 2012 * 2013 * @param array $match preg match 2014 * @return string 2015 */ 2016 function _wp_kses_decode_entities_chr_hexdec( $match ) { 2017 return chr( hexdec( $match[1] ) ); 2018 } 2019 2020 /** 2021 * Sanitize content with allowed HTML KSES rules. 2022 * 2023 * This function expects slashed data. 2024 * 2025 * @since 1.0.0 2026 * 2027 * @param string $data Content to filter, expected to be escaped with slashes. 2028 * @return string Filtered content. 2029 */ 2030 function wp_filter_kses( $data ) { 2031 return addslashes( wp_kses( stripslashes( $data ), current_filter() ) ); 2032 } 2033 2034 /** 2035 * Sanitize content with allowed HTML KSES rules. 2036 * 2037 * This function expects unslashed data. 2038 * 2039 * @since 2.9.0 2040 * 2041 * @param string $data Content to filter, expected to not be escaped. 2042 * @return string Filtered content. 2043 */ 2044 function wp_kses_data( $data ) { 2045 return wp_kses( $data, current_filter() ); 2046 } 2047 2048 /** 2049 * Sanitizes content for allowed HTML tags for post content. 2050 * 2051 * Post content refers to the page contents of the 'post' type and not `$_POST` 2052 * data from forms. 2053 * 2054 * This function expects slashed data. 2055 * 2056 * @since 2.0.0 2057 * 2058 * @param string $data Post content to filter, expected to be escaped with slashes. 2059 * @return string Filtered post content with allowed HTML tags and attributes intact. 2060 */ 2061 function wp_filter_post_kses( $data ) { 2062 return addslashes( wp_kses( stripslashes( $data ), 'post' ) ); 2063 } 2064 2065 /** 2066 * Sanitizes global styles user content removing unsafe rules. 2067 * 2068 * @since 5.9.0 2069 * 2070 * @param string $data Post content to filter. 2071 * @return string Filtered post content with unsafe rules removed. 2072 */ 2073 function wp_filter_global_styles_post( $data ) { 2074 $decoded_data = json_decode( wp_unslash( $data ), true ); 2075 $json_decoding_error = json_last_error(); 2076 if ( 2077 JSON_ERROR_NONE === $json_decoding_error && 2078 is_array( $decoded_data ) && 2079 isset( $decoded_data['isGlobalStylesUserThemeJSON'] ) && 2080 $decoded_data['isGlobalStylesUserThemeJSON'] 2081 ) { 2082 unset( $decoded_data['isGlobalStylesUserThemeJSON'] ); 2083 2084 $data_to_encode = WP_Theme_JSON::remove_insecure_properties( $decoded_data ); 2085 2086 $data_to_encode['isGlobalStylesUserThemeJSON'] = true; 2087 return wp_slash( wp_json_encode( $data_to_encode ) ); 2088 } 2089 return $data; 2090 } 2091 2092 /** 2093 * Sanitizes content for allowed HTML tags for post content. 2094 * 2095 * Post content refers to the page contents of the 'post' type and not `$_POST` 2096 * data from forms. 2097 * 2098 * This function expects unslashed data. 2099 * 2100 * @since 2.9.0 2101 * 2102 * @param string $data Post content to filter. 2103 * @return string Filtered post content with allowed HTML tags and attributes intact. 2104 */ 2105 function wp_kses_post( $data ) { 2106 return wp_kses( $data, 'post' ); 2107 } 2108 2109 /** 2110 * Navigates through an array, object, or scalar, and sanitizes content for 2111 * allowed HTML tags for post content. 2112 * 2113 * @since 4.4.2 2114 * 2115 * @see map_deep() 2116 * 2117 * @param mixed $data The array, object, or scalar value to inspect. 2118 * @return mixed The filtered content. 2119 */ 2120 function wp_kses_post_deep( $data ) { 2121 return map_deep( $data, 'wp_kses_post' ); 2122 } 2123 2124 /** 2125 * Strips all HTML from a text string. 2126 * 2127 * This function expects slashed data. 2128 * 2129 * @since 2.1.0 2130 * 2131 * @param string $data Content to strip all HTML from. 2132 * @return string Filtered content without any HTML. 2133 */ 2134 function wp_filter_nohtml_kses( $data ) { 2135 return addslashes( wp_kses( stripslashes( $data ), 'strip' ) ); 2136 } 2137 2138 /** 2139 * Adds all KSES input form content filters. 2140 * 2141 * All hooks have default priority. The `wp_filter_kses()` function is added to 2142 * the 'pre_comment_content' and 'title_save_pre' hooks. 2143 * 2144 * The `wp_filter_post_kses()` function is added to the 'content_save_pre', 2145 * 'excerpt_save_pre', and 'content_filtered_save_pre' hooks. 2146 * 2147 * @since 2.0.0 2148 */ 2149 function kses_init_filters() { 2150 // Normal filtering. 2151 add_filter( 'title_save_pre', 'wp_filter_kses' ); 2152 2153 // Comment filtering. 2154 if ( current_user_can( 'unfiltered_html' ) ) { 2155 add_filter( 'pre_comment_content', 'wp_filter_post_kses' ); 2156 } else { 2157 add_filter( 'pre_comment_content', 'wp_filter_kses' ); 2158 } 2159 2160 // Global Styles filtering: Global Styles filters should be executed before normal post_kses HTML filters. 2161 add_filter( 'content_save_pre', 'wp_filter_global_styles_post', 9 ); 2162 add_filter( 'content_filtered_save_pre', 'wp_filter_global_styles_post', 9 ); 2163 2164 // Post filtering. 2165 add_filter( 'content_save_pre', 'wp_filter_post_kses' ); 2166 add_filter( 'excerpt_save_pre', 'wp_filter_post_kses' ); 2167 add_filter( 'content_filtered_save_pre', 'wp_filter_post_kses' ); 2168 } 2169 2170 /** 2171 * Removes all KSES input form content filters. 2172 * 2173 * A quick procedural method to removing all of the filters that KSES uses for 2174 * content in WordPress Loop. 2175 * 2176 * Does not remove the `kses_init()` function from {@see 'init'} hook (priority is 2177 * default). Also does not remove `kses_init()` function from {@see 'set_current_user'} 2178 * hook (priority is also default). 2179 * 2180 * @since 2.0.6 2181 */ 2182 function kses_remove_filters() { 2183 // Normal filtering. 2184 remove_filter( 'title_save_pre', 'wp_filter_kses' ); 2185 2186 // Comment filtering. 2187 remove_filter( 'pre_comment_content', 'wp_filter_post_kses' ); 2188 remove_filter( 'pre_comment_content', 'wp_filter_kses' ); 2189 2190 // Global Styles filtering. 2191 remove_filter( 'content_save_pre', 'wp_filter_global_styles_post', 9 ); 2192 remove_filter( 'content_filtered_save_pre', 'wp_filter_global_styles_post', 9 ); 2193 2194 // Post filtering. 2195 remove_filter( 'content_save_pre', 'wp_filter_post_kses' ); 2196 remove_filter( 'excerpt_save_pre', 'wp_filter_post_kses' ); 2197 remove_filter( 'content_filtered_save_pre', 'wp_filter_post_kses' ); 2198 } 2199 2200 /** 2201 * Sets up most of the KSES filters for input form content. 2202 * 2203 * First removes all of the KSES filters in case the current user does not need 2204 * to have KSES filter the content. If the user does not have `unfiltered_html` 2205 * capability, then KSES filters are added. 2206 * 2207 * @since 2.0.0 2208 */ 2209 function kses_init() { 2210 kses_remove_filters(); 2211 2212 if ( ! current_user_can( 'unfiltered_html' ) ) { 2213 kses_init_filters(); 2214 } 2215 } 2216 2217 /** 2218 * Filters an inline style attribute and removes disallowed rules. 2219 * 2220 * @since 2.8.1 2221 * @since 4.4.0 Added support for `min-height`, `max-height`, `min-width`, and `max-width`. 2222 * @since 4.6.0 Added support for `list-style-type`. 2223 * @since 5.0.0 Added support for `background-image`. 2224 * @since 5.1.0 Added support for `text-transform`. 2225 * @since 5.2.0 Added support for `background-position` and `grid-template-columns`. 2226 * @since 5.3.0 Added support for `grid`, `flex` and `column` layout properties. 2227 * Extend `background-*` support of individual properties. 2228 * @since 5.3.1 Added support for gradient backgrounds. 2229 * @since 5.7.1 Added support for `object-position`. 2230 * @since 5.8.0 Added support for `calc()` and `var()` values. 2231 * 2232 * @param string $css A string of CSS rules. 2233 * @param string $deprecated Not used. 2234 * @return string Filtered string of CSS rules. 2235 */ 2236 function safecss_filter_attr( $css, $deprecated = '' ) { 2237 if ( ! empty( $deprecated ) ) { 2238 _deprecated_argument( __FUNCTION__, '2.8.1' ); // Never implemented. 2239 } 2240 2241 $css = wp_kses_no_null( $css ); 2242 $css = str_replace( array( "\n", "\r", "\t" ), '', $css ); 2243 2244 $allowed_protocols = wp_allowed_protocols(); 2245 2246 $css_array = explode( ';', trim( $css ) ); 2247 2248 /** 2249 * Filters the list of allowed CSS attributes. 2250 * 2251 * @since 2.8.1 2252 * 2253 * @param string[] $attr Array of allowed CSS attributes. 2254 */ 2255 $allowed_attr = apply_filters( 2256 'safe_style_css', 2257 array( 2258 'background', 2259 'background-color', 2260 'background-image', 2261 'background-position', 2262 'background-size', 2263 'background-attachment', 2264 'background-blend-mode', 2265 2266 'border', 2267 'border-radius', 2268 'border-width', 2269 'border-color', 2270 'border-style', 2271 'border-right', 2272 'border-right-color', 2273 'border-right-style', 2274 'border-right-width', 2275 'border-bottom', 2276 'border-bottom-color', 2277 'border-bottom-left-radius', 2278 'border-bottom-right-radius', 2279 'border-bottom-style', 2280 'border-bottom-width', 2281 'border-bottom-right-radius', 2282 'border-bottom-left-radius', 2283 'border-left', 2284 'border-left-color', 2285 'border-left-style', 2286 'border-left-width', 2287 'border-top', 2288 'border-top-color', 2289 'border-top-left-radius', 2290 'border-top-right-radius', 2291 'border-top-style', 2292 'border-top-width', 2293 'border-top-left-radius', 2294 'border-top-right-radius', 2295 2296 'border-spacing', 2297 'border-collapse', 2298 'caption-side', 2299 2300 'columns', 2301 'column-count', 2302 'column-fill', 2303 'column-gap', 2304 'column-rule', 2305 'column-span', 2306 'column-width', 2307 2308 'color', 2309 'filter', 2310 'font', 2311 'font-family', 2312 'font-size', 2313 'font-style', 2314 'font-variant', 2315 'font-weight', 2316 'letter-spacing', 2317 'line-height', 2318 'text-align', 2319 'text-decoration', 2320 'text-indent', 2321 'text-transform', 2322 2323 'height', 2324 'min-height', 2325 'max-height', 2326 2327 'width', 2328 'min-width', 2329 'max-width', 2330 2331 'margin', 2332 'margin-right', 2333 'margin-bottom', 2334 'margin-left', 2335 'margin-top', 2336 2337 'padding', 2338 'padding-right', 2339 'padding-bottom', 2340 'padding-left', 2341 'padding-top', 2342 2343 'flex', 2344 'flex-basis', 2345 'flex-direction', 2346 'flex-flow', 2347 'flex-grow', 2348 'flex-shrink', 2349 2350 'grid-template-columns', 2351 'grid-auto-columns', 2352 'grid-column-start', 2353 'grid-column-end', 2354 'grid-column-gap', 2355 'grid-template-rows', 2356 'grid-auto-rows', 2357 'grid-row-start', 2358 'grid-row-end', 2359 'grid-row-gap', 2360 'grid-gap', 2361 2362 'justify-content', 2363 'justify-items', 2364 'justify-self', 2365 'align-content', 2366 'align-items', 2367 'align-self', 2368 2369 'clear', 2370 'cursor', 2371 'direction', 2372 'float', 2373 'list-style-type', 2374 'object-position', 2375 'overflow', 2376 'vertical-align', 2377 ) 2378 ); 2379 2380 /* 2381 * CSS attributes that accept URL data types. 2382 * 2383 * This is in accordance to the CSS spec and unrelated to 2384 * the sub-set of supported attributes above. 2385 * 2386 * See: https://developer.mozilla.org/en-US/docs/Web/CSS/url 2387 */ 2388 $css_url_data_types = array( 2389 'background', 2390 'background-image', 2391 2392 'cursor', 2393 2394 'list-style', 2395 'list-style-image', 2396 ); 2397 2398 /* 2399 * CSS attributes that accept gradient data types. 2400 * 2401 */ 2402 $css_gradient_data_types = array( 2403 'background', 2404 'background-image', 2405 ); 2406 2407 if ( empty( $allowed_attr ) ) { 2408 return $css; 2409 } 2410 2411 $css = ''; 2412 foreach ( $css_array as $css_item ) { 2413 if ( '' === $css_item ) { 2414 continue; 2415 } 2416 2417 $css_item = trim( $css_item ); 2418 $css_test_string = $css_item; 2419 $found = false; 2420 $url_attr = false; 2421 $gradient_attr = false; 2422 2423 if ( strpos( $css_item, ':' ) === false ) { 2424 $found = true; 2425 } else { 2426 $parts = explode( ':', $css_item, 2 ); 2427 $css_selector = trim( $parts[0] ); 2428 2429 if ( in_array( $css_selector, $allowed_attr, true ) ) { 2430 $found = true; 2431 $url_attr = in_array( $css_selector, $css_url_data_types, true ); 2432 $gradient_attr = in_array( $css_selector, $css_gradient_data_types, true ); 2433 } 2434 } 2435 2436 if ( $found && $url_attr ) { 2437 // Simplified: matches the sequence `url(*)`. 2438 preg_match_all( '/url\([^)]+\)/', $parts[1], $url_matches ); 2439 2440 foreach ( $url_matches[0] as $url_match ) { 2441 // Clean up the URL from each of the matches above. 2442 preg_match( '/^url\(\s*([\'\"]?)(.*)(\g1)\s*\)$/', $url_match, $url_pieces ); 2443 2444 if ( empty( $url_pieces[2] ) ) { 2445 $found = false; 2446 break; 2447 } 2448 2449 $url = trim( $url_pieces[2] ); 2450 2451 if ( empty( $url ) || wp_kses_bad_protocol( $url, $allowed_protocols ) !== $url ) { 2452 $found = false; 2453 break; 2454 } else { 2455 // Remove the whole `url(*)` bit that was matched above from the CSS. 2456 $css_test_string = str_replace( $url_match, '', $css_test_string ); 2457 } 2458 } 2459 } 2460 2461 if ( $found && $gradient_attr ) { 2462 $css_value = trim( $parts[1] ); 2463 if ( preg_match( '/^(repeating-)?(linear|radial|conic)-gradient\(([^()]|rgb[a]?\([^()]*\))*\)$/', $css_value ) ) { 2464 // Remove the whole `gradient` bit that was matched above from the CSS. 2465 $css_test_string = str_replace( $css_value, '', $css_test_string ); 2466 } 2467 } 2468 2469 if ( $found ) { 2470 // Allow CSS calc(). 2471 $css_test_string = preg_replace( '/calc\(((?:\([^()]*\)?|[^()])*)\)/', '', $css_test_string ); 2472 // Allow CSS var(). 2473 $css_test_string = preg_replace( '/\(?var\(--[a-zA-Z0-9_-]*\)/', '', $css_test_string ); 2474 2475 // Check for any CSS containing \ ( & } = or comments, 2476 // except for url(), calc(), or var() usage checked above. 2477 $allow_css = ! preg_match( '%[\\\(&=}]|/\*%', $css_test_string ); 2478 2479 /** 2480 * Filters the check for unsafe CSS in `safecss_filter_attr`. 2481 * 2482 * Enables developers to determine whether a section of CSS should be allowed or discarded. 2483 * By default, the value will be false if the part contains \ ( & } = or comments. 2484 * Return true to allow the CSS part to be included in the output. 2485 * 2486 * @since 5.5.0 2487 * 2488 * @param bool $allow_css Whether the CSS in the test string is considered safe. 2489 * @param string $css_test_string The CSS string to test. 2490 */ 2491 $allow_css = apply_filters( 'safecss_filter_attr_allow_css', $allow_css, $css_test_string ); 2492 2493 // Only add the CSS part if it passes the regex check. 2494 if ( $allow_css ) { 2495 if ( '' !== $css ) { 2496 $css .= ';'; 2497 } 2498 2499 $css .= $css_item; 2500 } 2501 } 2502 } 2503 2504 return $css; 2505 } 2506 2507 /** 2508 * Helper function to add global attributes to a tag in the allowed HTML list. 2509 * 2510 * @since 3.5.0 2511 * @since 5.0.0 Added support for `data-*` wildcard attributes. 2512 * @since 6.0.0 Added `dir`, `lang`, and `xml:lang` to global attributes. 2513 * 2514 * @access private 2515 * @ignore 2516 * 2517 * @param array $value An array of attributes. 2518 * @return array The array of attributes with global attributes added. 2519 */ 2520 function _wp_add_global_attributes( $value ) { 2521 $global_attributes = array( 2522 'aria-describedby' => true, 2523 'aria-details' => true, 2524 'aria-label' => true, 2525 'aria-labelledby' => true, 2526 'aria-hidden' => true, 2527 'class' => true, 2528 'data-*' => true, 2529 'dir' => true, 2530 'id' => true, 2531 'lang' => true, 2532 'style' => true, 2533 'title' => true, 2534 'role' => true, 2535 'xml:lang' => true, 2536 ); 2537 2538 if ( true === $value ) { 2539 $value = array(); 2540 } 2541 2542 if ( is_array( $value ) ) { 2543 return array_merge( $value, $global_attributes ); 2544 } 2545 2546 return $value; 2547 } 2548 2549 /** 2550 * Helper function to check if this is a safe PDF URL. 2551 * 2552 * @since 5.9.0 2553 * @access private 2554 * @ignore 2555 * 2556 * @param string $url The URL to check. 2557 * @return bool True if the URL is safe, false otherwise. 2558 */ 2559 function _wp_kses_allow_pdf_objects( $url ) { 2560 // We're not interested in URLs that contain query strings or fragments. 2561 if ( str_contains( $url, '?' ) || str_contains( $url, '#' ) ) { 2562 return false; 2563 } 2564 2565 // If it doesn't have a PDF extension, it's not safe. 2566 if ( ! str_ends_with( $url, '.pdf' ) ) { 2567 return false; 2568 } 2569 2570 // If the URL host matches the current site's media URL, it's safe. 2571 $upload_info = wp_upload_dir( null, false ); 2572 $parsed_url = wp_parse_url( $upload_info['url'] ); 2573 $upload_host = isset( $parsed_url['host'] ) ? $parsed_url['host'] : ''; 2574 $upload_port = isset( $parsed_url['port'] ) ? ':' . $parsed_url['port'] : ''; 2575 2576 if ( str_starts_with( $url, "http://$upload_host$upload_port/" ) 2577 || str_starts_with( $url, "https://$upload_host$upload_port/" ) 2578 ) { 2579 return true; 2580 } 2581 2582 return false; 2583 }
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| Generated: Fri Apr 26 01:00:03 2024 | Cross-referenced by PHPXref 0.7.1 |