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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 * When using this constant, make sure to set all of these globals to arrays: 40 * 41 * - `$allowedposttags` 42 * - `$allowedtags` 43 * - `$allowedentitynames` 44 * - `$allowedxmlentitynames` 45 * 46 * @see wp_kses_allowed_html() 47 * @since 1.2.0 48 * 49 * @var array[]|false Array of default allowable HTML tags, or false to use the defaults. 50 */ 51 if ( ! defined( 'CUSTOM_TAGS' ) ) { 52 define( 'CUSTOM_TAGS', false ); 53 } 54 55 // Ensure that these variables are added to the global namespace 56 // (e.g. if using namespaces / autoload in the current PHP environment). 57 global $allowedposttags, $allowedtags, $allowedentitynames, $allowedxmlentitynames; 58 59 if ( ! CUSTOM_TAGS ) { 60 /** 61 * KSES global for default allowable HTML tags. 62 * 63 * Can be overridden with the `CUSTOM_TAGS` constant. 64 * 65 * @var array[] $allowedposttags Array of default allowable HTML tags. 66 * @since 2.0.0 67 */ 68 $allowedposttags = array( 69 'address' => array(), 70 'a' => array( 71 'href' => true, 72 'rel' => true, 73 'rev' => true, 74 'name' => true, 75 'target' => true, 76 'download' => array( 77 'valueless' => 'y', 78 ), 79 ), 80 'abbr' => array(), 81 'acronym' => array(), 82 'area' => array( 83 'alt' => true, 84 'coords' => true, 85 'href' => true, 86 'nohref' => true, 87 'shape' => true, 88 'target' => true, 89 ), 90 'article' => array( 91 'align' => true, 92 ), 93 'aside' => array( 94 'align' => true, 95 ), 96 'audio' => array( 97 'autoplay' => true, 98 'controls' => true, 99 'loop' => true, 100 'muted' => true, 101 'preload' => true, 102 'src' => true, 103 ), 104 'b' => array(), 105 'bdo' => array(), 106 'big' => array(), 107 'blockquote' => array( 108 'cite' => true, 109 ), 110 'br' => array(), 111 'button' => array( 112 'command' => true, 113 'commandfor' => true, 114 'disabled' => true, 115 'name' => true, 116 'type' => true, 117 'value' => true, 118 'popovertarget' => true, 119 'popovertargetaction' => true, 120 'aria-haspopup' => true, 121 ), 122 'caption' => array( 123 'align' => true, 124 ), 125 'cite' => array(), 126 'code' => array(), 127 'col' => array( 128 'align' => true, 129 'char' => true, 130 'charoff' => true, 131 'span' => true, 132 'valign' => true, 133 'width' => true, 134 ), 135 'colgroup' => array( 136 'align' => true, 137 'char' => true, 138 'charoff' => true, 139 'span' => true, 140 'valign' => true, 141 'width' => true, 142 ), 143 'data' => array( 144 'value' => true, 145 ), 146 'del' => array( 147 'datetime' => true, 148 ), 149 'dd' => array(), 150 'dfn' => array(), 151 'details' => array( 152 'align' => true, 153 'open' => true, 154 'name' => true, 155 ), 156 'div' => array( 157 'align' => true, 158 'popover' => true, 159 ), 160 'dialog' => array( 161 'closedby' => true, 162 'open' => true, 163 'popover' => true, 164 'autofocus' => true, 165 ), 166 'dl' => array(), 167 'dt' => array(), 168 'em' => array(), 169 'fieldset' => array(), 170 'figure' => array( 171 'align' => true, 172 ), 173 'figcaption' => array( 174 'align' => true, 175 ), 176 'font' => array( 177 'color' => true, 178 'face' => true, 179 'size' => true, 180 ), 181 'footer' => array( 182 'align' => true, 183 ), 184 'h1' => array( 185 'align' => true, 186 ), 187 'h2' => array( 188 'align' => true, 189 ), 190 'h3' => array( 191 'align' => true, 192 ), 193 'h4' => array( 194 'align' => true, 195 ), 196 'h5' => array( 197 'align' => true, 198 ), 199 'h6' => array( 200 'align' => true, 201 ), 202 'header' => array( 203 'align' => true, 204 ), 205 'hgroup' => array( 206 'align' => true, 207 ), 208 'hr' => array( 209 'align' => true, 210 'noshade' => true, 211 'size' => true, 212 'width' => true, 213 ), 214 'i' => array(), 215 'img' => array( 216 'alt' => true, 217 'align' => true, 218 'border' => true, 219 'height' => true, 220 'hspace' => true, 221 'loading' => true, 222 'longdesc' => true, 223 'vspace' => true, 224 'src' => true, 225 'usemap' => true, 226 'width' => true, 227 ), 228 'ins' => array( 229 'datetime' => true, 230 'cite' => true, 231 ), 232 'kbd' => array(), 233 'label' => array( 234 'for' => true, 235 ), 236 'legend' => array( 237 'align' => true, 238 ), 239 'li' => array( 240 'align' => true, 241 'value' => true, 242 ), 243 'main' => array( 244 'align' => true, 245 ), 246 'map' => array( 247 'name' => true, 248 ), 249 'mark' => array(), 250 'menu' => array( 251 'type' => true, 252 ), 253 'meter' => array( 254 'high' => true, 255 'low' => true, 256 'max' => true, 257 'min' => true, 258 'optimum' => true, 259 'value' => true, 260 ), 261 'nav' => array( 262 'align' => true, 263 ), 264 'object' => array( 265 'data' => array( 266 'required' => true, 267 'value_callback' => '_wp_kses_allow_pdf_objects', 268 ), 269 'type' => array( 270 'required' => true, 271 'values' => array( 'application/pdf' ), 272 ), 273 ), 274 'p' => array( 275 'align' => true, 276 ), 277 'pre' => array( 278 'width' => true, 279 ), 280 'progress' => array( 281 'max' => true, 282 'value' => true, 283 ), 284 'q' => array( 285 'cite' => true, 286 ), 287 'rb' => array(), 288 'rp' => array(), 289 'rt' => array(), 290 'rtc' => array(), 291 'ruby' => array(), 292 's' => array(), 293 'samp' => array(), 294 'search' => array(), 295 'span' => array( 296 'align' => true, 297 ), 298 'section' => array( 299 'align' => true, 300 ), 301 'small' => array(), 302 'strike' => array(), 303 'strong' => array(), 304 'sub' => array(), 305 'summary' => array( 306 'align' => true, 307 ), 308 'sup' => array(), 309 'table' => array( 310 'align' => true, 311 'bgcolor' => true, 312 'border' => true, 313 'cellpadding' => true, 314 'cellspacing' => true, 315 'rules' => true, 316 'summary' => true, 317 'width' => true, 318 ), 319 'tbody' => array( 320 'align' => true, 321 'char' => true, 322 'charoff' => true, 323 'valign' => true, 324 ), 325 'td' => array( 326 'abbr' => true, 327 'align' => true, 328 'axis' => true, 329 'bgcolor' => true, 330 'char' => true, 331 'charoff' => true, 332 'colspan' => true, 333 'headers' => true, 334 'height' => true, 335 'nowrap' => true, 336 'rowspan' => true, 337 'scope' => true, 338 'valign' => true, 339 'width' => true, 340 ), 341 'textarea' => array( 342 'cols' => true, 343 'rows' => true, 344 'disabled' => true, 345 'name' => true, 346 'readonly' => true, 347 ), 348 'tfoot' => array( 349 'align' => true, 350 'char' => true, 351 'charoff' => true, 352 'valign' => true, 353 ), 354 'th' => array( 355 'abbr' => true, 356 'align' => true, 357 'axis' => true, 358 'bgcolor' => true, 359 'char' => true, 360 'charoff' => true, 361 'colspan' => true, 362 'headers' => true, 363 'height' => true, 364 'nowrap' => true, 365 'rowspan' => true, 366 'scope' => true, 367 'valign' => true, 368 'width' => true, 369 ), 370 'thead' => array( 371 'align' => true, 372 'char' => true, 373 'charoff' => true, 374 'valign' => true, 375 ), 376 'time' => array( 377 'datetime' => true, 378 ), 379 'title' => array(), 380 'tr' => array( 381 'align' => true, 382 'bgcolor' => true, 383 'char' => true, 384 'charoff' => true, 385 'valign' => true, 386 ), 387 'track' => array( 388 'default' => true, 389 'kind' => true, 390 'label' => true, 391 'src' => true, 392 'srclang' => true, 393 ), 394 'tt' => array(), 395 'u' => array(), 396 'ul' => array( 397 'type' => true, 398 'popover' => true, 399 'role' => true, 400 ), 401 'ol' => array( 402 'start' => true, 403 'type' => true, 404 'reversed' => true, 405 ), 406 'var' => array(), 407 'video' => array( 408 'autoplay' => true, 409 'controls' => true, 410 'height' => true, 411 'loop' => true, 412 'muted' => true, 413 'playsinline' => true, 414 'poster' => true, 415 'preload' => true, 416 'src' => true, 417 'width' => true, 418 ), 419 'wbr' => array(), 420 ); 421 422 // https://www.w3.org/TR/mathml-core/#global-attributes 423 // Except common attributes added by _wp_add_global_attributes. 424 $math_global_attributes = array( 425 'displaystyle' => true, 426 'scriptlevel' => true, 427 'mathbackground' => true, 428 'mathcolor' => true, 429 'mathsize' => true, 430 // Common attributes also defined by _wp_add_global_attributes. 431 // We do not want to add all those global attributes though. 432 'class' => true, 433 'data-*' => true, 434 'dir' => true, 435 'id' => true, 436 'style' => true, 437 ); 438 439 $math_overunder_attributes = array( 440 'accentunder' => true, 441 'accent' => true, 442 ); 443 444 $allowedposttags = array_merge( 445 $allowedposttags, 446 array( 447 // https://www.w3.org/TR/mathml-core/#the-top-level-math-element 448 'math' => array_merge( 449 $math_global_attributes, 450 array( 451 'display' => true, 452 ) 453 ), 454 455 // https://www.w3.org/TR/mathml-core/#token-elements 456 // https://www.w3.org/TR/mathml-core/#text-mtext 457 'mtext' => $math_global_attributes, 458 // https://www.w3.org/TR/mathml-core/#the-mi-element 459 'mi' => array_merge( 460 $math_global_attributes, 461 array( 462 'mathvariant' => true, 463 ) 464 ), 465 // https://www.w3.org/TR/mathml-core/#number-mn 466 'mn' => $math_global_attributes, 467 // https://www.w3.org/TR/mathml-core/#operator-fence-separator-or-accent-mo 468 'mo' => array_merge( 469 $math_global_attributes, 470 array( 471 'form' => true, 472 'fence' => true, 473 'separator' => true, 474 'lspace' => true, 475 'rspace' => true, 476 'stretchy' => true, 477 'symmetric' => true, 478 'maxsize' => true, 479 'minsize' => true, 480 'largeop' => true, 481 'movablelimits' => true, 482 ) 483 ), 484 // https://www.w3.org/TR/mathml-core/#space-mspace 485 'mspace' => array_merge( 486 $math_global_attributes, 487 array( 488 'width' => true, 489 'height' => true, 490 'depth' => true, 491 ) 492 ), 493 // https://www.w3.org/TR/mathml-core/#string-literal-ms 494 'ms' => $math_global_attributes, 495 496 // https://www.w3.org/TR/mathml-core/#general-layout-schemata 497 // https://www.w3.org/TR/mathml-core/#horizontally-group-sub-expressions-mrow 498 'mrow' => $math_global_attributes, 499 // https://www.w3.org/TR/mathml-core/#fractions-mfrac 500 'mfrac' => array_merge( 501 $math_global_attributes, 502 array( 503 'linethickness' => true, 504 ) 505 ), 506 // https://www.w3.org/TR/mathml-core/#radicals-msqrt-mroot 507 'msqrt' => $math_global_attributes, 508 'mroot' => $math_global_attributes, 509 // https://www.w3.org/TR/mathml-core/#style-change-mstyle 510 'mstyle' => $math_global_attributes, 511 // https://www.w3.org/TR/mathml-core/#error-message-merror 512 'merror' => $math_global_attributes, 513 // https://www.w3.org/TR/mathml-core/#adjust-space-around-content-mpadded 514 'mpadded' => array_merge( 515 $math_global_attributes, 516 array( 517 'width' => true, 518 'height' => true, 519 'depth' => true, 520 'lspace' => true, 521 'voffset' => true, 522 ) 523 ), 524 // https://www.w3.org/TR/mathml-core/#making-sub-expressions-invisible-mphantom 525 'mphantom' => $math_global_attributes, 526 527 // https://www.w3.org/TR/mathml-core/#script-and-limit-schemata 528 // https://www.w3.org/TR/mathml-core/#subscripts-and-superscripts-msub-msup-msubsup 529 'msub' => $math_global_attributes, 530 'msup' => $math_global_attributes, 531 'msubsup' => $math_global_attributes, 532 // https://www.w3.org/TR/mathml-core/#underscripts-and-overscripts-munder-mover-munderover 533 'munder' => array_merge( $math_global_attributes, $math_overunder_attributes ), 534 'mover' => array_merge( $math_global_attributes, $math_overunder_attributes ), 535 'munderover' => array_merge( $math_global_attributes, $math_overunder_attributes ), 536 // https://www.w3.org/TR/mathml-core/#prescripts-and-tensor-indices-mmultiscripts 537 'mmultiscripts' => $math_global_attributes, 538 'mprescripts' => $math_global_attributes, 539 540 // https://www.w3.org/TR/mathml-core/#tabular-math 541 // https://www.w3.org/TR/mathml-core/#table-or-matrix-mtable 542 'mtable' => array_merge( 543 $math_global_attributes, 544 array( 545 // Non-standard, used by temml/katex. 546 // https://developer.mozilla.org/en-US/docs/Web/MathML/Reference/Element/mtable 547 'columnalign' => true, 548 'rowspacing' => true, 549 'columnspacing' => true, 550 'align' => true, 551 'rowalign' => true, 552 'columnlines' => true, 553 'rowlines' => true, 554 'frame' => true, 555 'framespacing' => true, 556 'width' => true, 557 ) 558 ), 559 // https://www.w3.org/TR/mathml-core/#row-in-table-or-matrix-mtr 560 'mtr' => array_merge( 561 $math_global_attributes, 562 array( 563 // Non-standard, used by temml/katex. 564 // https://developer.mozilla.org/en-US/docs/Web/MathML/Reference/Element/mtr 565 'columnalign' => true, 566 'rowalign' => true, 567 ) 568 ), 569 // https://www.w3.org/TR/mathml-core/#entry-in-table-or-matrix-mtd 570 'mtd' => array_merge( 571 $math_global_attributes, 572 array( 573 'columnspan' => true, 574 'rowspan' => true, 575 // Non-standard, used by temml/katex. 576 // https://developer.mozilla.org/en-US/docs/Web/MathML/Reference/Element/mtd 577 'columnalign' => true, 578 'rowalign' => true, 579 ) 580 ), 581 582 // https://www.w3.org/TR/mathml-core/#semantics-and-presentation 583 'semantics' => $math_global_attributes, 584 'annotation' => array_merge( 585 $math_global_attributes, 586 array( 587 'encoding' => true, 588 ) 589 ), 590 591 // Non-standard but widely supported, used by temml/katex. 592 'menclose' => array_merge( 593 $math_global_attributes, 594 array( 595 'notation' => true, 596 ) 597 ), 598 ) 599 ); 600 601 /** 602 * @var array[] $allowedtags Array of KSES allowed HTML elements. 603 * @since 1.0.0 604 */ 605 $allowedtags = array( 606 'a' => array( 607 'href' => true, 608 'title' => true, 609 ), 610 'abbr' => array( 611 'title' => true, 612 ), 613 'acronym' => array( 614 'title' => true, 615 ), 616 'b' => array(), 617 'blockquote' => array( 618 'cite' => true, 619 ), 620 'cite' => array(), 621 'code' => array(), 622 'del' => array( 623 'datetime' => true, 624 ), 625 'em' => array(), 626 'i' => array(), 627 'q' => array( 628 'cite' => true, 629 ), 630 's' => array(), 631 'strike' => array(), 632 'strong' => array(), 633 ); 634 635 /** 636 * @var string[] $allowedentitynames Array of KSES allowed HTML entity names. 637 * @since 1.0.0 638 */ 639 $allowedentitynames = array( 640 'nbsp', 641 'iexcl', 642 'cent', 643 'pound', 644 'curren', 645 'yen', 646 'brvbar', 647 'sect', 648 'uml', 649 'copy', 650 'ordf', 651 'laquo', 652 'not', 653 'shy', 654 'reg', 655 'macr', 656 'deg', 657 'plusmn', 658 'acute', 659 'micro', 660 'para', 661 'middot', 662 'cedil', 663 'ordm', 664 'raquo', 665 'iquest', 666 'Agrave', 667 'Aacute', 668 'Acirc', 669 'Atilde', 670 'Auml', 671 'Aring', 672 'AElig', 673 'Ccedil', 674 'Egrave', 675 'Eacute', 676 'Ecirc', 677 'Euml', 678 'Igrave', 679 'Iacute', 680 'Icirc', 681 'Iuml', 682 'ETH', 683 'Ntilde', 684 'Ograve', 685 'Oacute', 686 'Ocirc', 687 'Otilde', 688 'Ouml', 689 'times', 690 'Oslash', 691 'Ugrave', 692 'Uacute', 693 'Ucirc', 694 'Uuml', 695 'Yacute', 696 'THORN', 697 'szlig', 698 'agrave', 699 'aacute', 700 'acirc', 701 'atilde', 702 'auml', 703 'aring', 704 'aelig', 705 'ccedil', 706 'egrave', 707 'eacute', 708 'ecirc', 709 'euml', 710 'igrave', 711 'iacute', 712 'icirc', 713 'iuml', 714 'eth', 715 'ntilde', 716 'ograve', 717 'oacute', 718 'ocirc', 719 'otilde', 720 'ouml', 721 'divide', 722 'oslash', 723 'ugrave', 724 'uacute', 725 'ucirc', 726 'uuml', 727 'yacute', 728 'thorn', 729 'yuml', 730 'quot', 731 'amp', 732 'lt', 733 'gt', 734 'apos', 735 'OElig', 736 'oelig', 737 'Scaron', 738 'scaron', 739 'Yuml', 740 'circ', 741 'tilde', 742 'ensp', 743 'emsp', 744 'thinsp', 745 'zwnj', 746 'zwj', 747 'lrm', 748 'rlm', 749 'ndash', 750 'mdash', 751 'lsquo', 752 'rsquo', 753 'sbquo', 754 'ldquo', 755 'rdquo', 756 'bdquo', 757 'dagger', 758 'Dagger', 759 'permil', 760 'lsaquo', 761 'rsaquo', 762 'euro', 763 'fnof', 764 'Alpha', 765 'Beta', 766 'Gamma', 767 'Delta', 768 'Epsilon', 769 'Zeta', 770 'Eta', 771 'Theta', 772 'Iota', 773 'Kappa', 774 'Lambda', 775 'Mu', 776 'Nu', 777 'Xi', 778 'Omicron', 779 'Pi', 780 'Rho', 781 'Sigma', 782 'Tau', 783 'Upsilon', 784 'Phi', 785 'Chi', 786 'Psi', 787 'Omega', 788 'alpha', 789 'beta', 790 'gamma', 791 'delta', 792 'epsilon', 793 'zeta', 794 'eta', 795 'theta', 796 'iota', 797 'kappa', 798 'lambda', 799 'mu', 800 'nu', 801 'xi', 802 'omicron', 803 'pi', 804 'rho', 805 'sigmaf', 806 'sigma', 807 'tau', 808 'upsilon', 809 'phi', 810 'chi', 811 'psi', 812 'omega', 813 'thetasym', 814 'upsih', 815 'piv', 816 'bull', 817 'hellip', 818 'prime', 819 'Prime', 820 'oline', 821 'frasl', 822 'weierp', 823 'image', 824 'real', 825 'trade', 826 'alefsym', 827 'larr', 828 'uarr', 829 'rarr', 830 'darr', 831 'harr', 832 'crarr', 833 'lArr', 834 'uArr', 835 'rArr', 836 'dArr', 837 'hArr', 838 'forall', 839 'part', 840 'exist', 841 'empty', 842 'nabla', 843 'isin', 844 'notin', 845 'ni', 846 'prod', 847 'sum', 848 'minus', 849 'lowast', 850 'radic', 851 'prop', 852 'infin', 853 'ang', 854 'and', 855 'or', 856 'cap', 857 'cup', 858 'int', 859 'sim', 860 'cong', 861 'asymp', 862 'ne', 863 'equiv', 864 'le', 865 'ge', 866 'sub', 867 'sup', 868 'nsub', 869 'sube', 870 'supe', 871 'oplus', 872 'otimes', 873 'perp', 874 'sdot', 875 'lceil', 876 'rceil', 877 'lfloor', 878 'rfloor', 879 'lang', 880 'rang', 881 'loz', 882 'spades', 883 'clubs', 884 'hearts', 885 'diams', 886 'sup1', 887 'sup2', 888 'sup3', 889 'frac14', 890 'frac12', 891 'frac34', 892 'there4', 893 ); 894 895 /** 896 * @var string[] $allowedxmlentitynames Array of KSES allowed XML entity names. 897 * @since 5.5.0 898 */ 899 $allowedxmlentitynames = array( 900 'amp', 901 'lt', 902 'gt', 903 'apos', 904 'quot', 905 ); 906 907 $allowedposttags = array_map( '_wp_add_global_attributes', $allowedposttags ); 908 } else { 909 $required_kses_globals = array( 910 'allowedposttags', 911 'allowedtags', 912 'allowedentitynames', 913 'allowedxmlentitynames', 914 ); 915 $missing_kses_globals = array(); 916 917 foreach ( $required_kses_globals as $global_name ) { 918 if ( ! isset( $GLOBALS[ $global_name ] ) || ! is_array( $GLOBALS[ $global_name ] ) ) { 919 $missing_kses_globals[] = '<code>$' . $global_name . '</code>'; 920 } 921 } 922 923 if ( $missing_kses_globals ) { 924 _doing_it_wrong( 925 'wp_kses_allowed_html', 926 sprintf( 927 /* translators: 1: CUSTOM_TAGS, 2: Global variable names. */ 928 __( 'When using the %1$s constant, make sure to set these globals to an array: %2$s.' ), 929 '<code>CUSTOM_TAGS</code>', 930 implode( ', ', $missing_kses_globals ) 931 ), 932 '6.2.0' 933 ); 934 } 935 936 $allowedtags = wp_kses_array_lc( $allowedtags ); 937 $allowedposttags = wp_kses_array_lc( $allowedposttags ); 938 } 939 940 /** 941 * Filters text content and strips out disallowed HTML. 942 * 943 * This function makes sure that only the allowed HTML element names, attribute 944 * names, attribute values, and HTML entities will occur in the given text string. 945 * 946 * This function expects unslashed data. 947 * 948 * @see wp_kses_post() for specifically filtering post content and fields. 949 * @see wp_allowed_protocols() for the default allowed protocols in link URLs. 950 * 951 * @since 1.0.0 952 * 953 * @param string $content Text content to filter. 954 * @param array[]|string $allowed_html An array of allowed HTML elements and attributes, 955 * or a context name such as 'post'. See wp_kses_allowed_html() 956 * for the list of accepted context names. 957 * @param string[] $allowed_protocols Optional. Array of allowed URL protocols. 958 * Defaults to the result of wp_allowed_protocols(). 959 * @return string Filtered content containing only the allowed HTML. 960 */ 961 function wp_kses( $content, $allowed_html, $allowed_protocols = array() ) { 962 if ( empty( $allowed_protocols ) ) { 963 $allowed_protocols = wp_allowed_protocols(); 964 } 965 966 $content = wp_kses_no_null( $content, array( 'slash_zero' => 'keep' ) ); 967 $content = wp_kses_normalize_entities( $content ); 968 $content = wp_kses_hook( $content, $allowed_html, $allowed_protocols ); 969 970 return wp_kses_split( $content, $allowed_html, $allowed_protocols ); 971 } 972 973 /** 974 * Filters one HTML attribute and ensures its value is allowed. 975 * 976 * This function can escape data in some situations where `wp_kses()` must strip the whole attribute. 977 * 978 * @since 4.2.3 979 * 980 * @param string $attr The 'whole' attribute, including name and value. 981 * @param string $element The HTML element name to which the attribute belongs. 982 * @return string Filtered attribute. 983 */ 984 function wp_kses_one_attr( $attr, $element ) { 985 $uris = wp_kses_uri_attributes(); 986 $allowed_html = wp_kses_allowed_html( 'post' ); 987 $allowed_protocols = wp_allowed_protocols(); 988 $attr = wp_kses_no_null( $attr, array( 'slash_zero' => 'keep' ) ); 989 990 // Preserve leading and trailing whitespace. 991 $matches = array(); 992 preg_match( '/^\s*/', $attr, $matches ); 993 $lead = $matches[0]; 994 preg_match( '/\s*$/', $attr, $matches ); 995 $trail = $matches[0]; 996 if ( empty( $trail ) ) { 997 $attr = substr( $attr, strlen( $lead ) ); 998 } else { 999 $attr = substr( $attr, strlen( $lead ), -strlen( $trail ) ); 1000 } 1001 1002 // Parse attribute name and value from input. 1003 $split = preg_split( '/\s*=\s*/', $attr, 2 ); 1004 $name = $split[0]; 1005 if ( count( $split ) === 2 ) { 1006 $value = $split[1]; 1007 1008 /* 1009 * Remove quotes surrounding $value. 1010 * Also guarantee correct quoting in $attr for this one attribute. 1011 */ 1012 if ( '' === $value ) { 1013 $quote = ''; 1014 } else { 1015 $quote = $value[0]; 1016 } 1017 if ( '"' === $quote || "'" === $quote ) { 1018 if ( ! str_ends_with( $value, $quote ) ) { 1019 return ''; 1020 } 1021 $value = substr( $value, 1, -1 ); 1022 } else { 1023 $quote = '"'; 1024 } 1025 1026 // Sanitize quotes, angle braces, and entities. 1027 $value = esc_attr( $value ); 1028 1029 // Sanitize URI values. 1030 if ( in_array( strtolower( $name ), $uris, true ) ) { 1031 $value = wp_kses_bad_protocol( $value, $allowed_protocols ); 1032 } 1033 1034 $attr = "$name=$quote$value$quote"; 1035 $vless = 'n'; 1036 } else { 1037 $value = ''; 1038 $vless = 'y'; 1039 } 1040 1041 // Sanitize attribute by name. 1042 wp_kses_attr_check( $name, $value, $attr, $vless, $element, $allowed_html ); 1043 1044 // Restore whitespace. 1045 return $lead . $attr . $trail; 1046 } 1047 1048 /** 1049 * Returns an array of allowed HTML tags and attributes for a given context. 1050 * 1051 * @since 3.5.0 1052 * @since 5.0.1 `form` removed as allowable HTML tag. 1053 * 1054 * @global array $allowedposttags 1055 * @global array $allowedtags 1056 * @global array $allowedentitynames 1057 * 1058 * @param string|array $context The context for which to retrieve tags. Allowed values are 'post', 1059 * 'strip', 'data', 'entities', or the name of a field filter such as 1060 * 'pre_user_description', or an array of allowed HTML elements and attributes. 1061 * @return array Array of allowed HTML tags and their allowed attributes. 1062 */ 1063 function wp_kses_allowed_html( $context = '' ) { 1064 global $allowedposttags, $allowedtags, $allowedentitynames; 1065 1066 if ( is_array( $context ) ) { 1067 // When `$context` is an array it's actually an array of allowed HTML elements and attributes. 1068 $html = $context; 1069 $context = 'explicit'; 1070 1071 /** 1072 * Filters the HTML tags that are allowed for a given context. 1073 * 1074 * HTML tags and attribute names are case-insensitive in HTML but must be 1075 * added to the KSES allow list in lowercase. An item added to the allow list 1076 * in upper or mixed case will not recognized as permitted by KSES. 1077 * 1078 * @since 3.5.0 1079 * 1080 * @param array[] $html Allowed HTML tags. 1081 * @param string $context Context name. 1082 */ 1083 return apply_filters( 'wp_kses_allowed_html', $html, $context ); 1084 } 1085 1086 switch ( $context ) { 1087 case 'post': 1088 /** This filter is documented in wp-includes/kses.php */ 1089 $tags = apply_filters( 'wp_kses_allowed_html', $allowedposttags, $context ); 1090 1091 // 5.0.1 removed the `<form>` tag, allow it if a filter is allowing it's sub-elements `<input>` or `<select>`. 1092 if ( ! CUSTOM_TAGS && ! isset( $tags['form'] ) && ( isset( $tags['input'] ) || isset( $tags['select'] ) ) ) { 1093 $tags = $allowedposttags; 1094 1095 $tags['form'] = array( 1096 'action' => true, 1097 'accept' => true, 1098 'accept-charset' => true, 1099 'enctype' => true, 1100 'method' => true, 1101 'name' => true, 1102 'target' => true, 1103 ); 1104 1105 /** This filter is documented in wp-includes/kses.php */ 1106 $tags = apply_filters( 'wp_kses_allowed_html', $tags, $context ); 1107 } 1108 1109 return $tags; 1110 1111 case 'user_description': 1112 case 'pre_term_description': 1113 case 'pre_user_description': 1114 $tags = $allowedtags; 1115 $tags['a']['rel'] = true; 1116 $tags['a']['target'] = true; 1117 /** This filter is documented in wp-includes/kses.php */ 1118 return apply_filters( 'wp_kses_allowed_html', $tags, $context ); 1119 1120 case 'strip': 1121 /** This filter is documented in wp-includes/kses.php */ 1122 return apply_filters( 'wp_kses_allowed_html', array(), $context ); 1123 1124 case 'entities': 1125 /** This filter is documented in wp-includes/kses.php */ 1126 return apply_filters( 'wp_kses_allowed_html', $allowedentitynames, $context ); 1127 1128 case 'data': 1129 default: 1130 /** This filter is documented in wp-includes/kses.php */ 1131 return apply_filters( 'wp_kses_allowed_html', $allowedtags, $context ); 1132 } 1133 } 1134 1135 /** 1136 * Allows the note mention chip markup in comment content. 1137 * 1138 * The notes `@` mention completer stores a mention as a chip carrying the 1139 * mentioned user's ID in a class token: 1140 * `<span class="wp-note-mention user-N">@Name</span>`. The default comment 1141 * allowlist does not allow `span` at all, so for users without 1142 * `unfiltered_html` the mention would be stripped on save. 1143 * 1144 * The allowance is deliberately narrow and always on: `span` is a 1145 * semantics-free element and _wp_kses_sanitize_note_mention_classes() 1146 * reduces its `class` to the two mention tokens right after kses runs, so 1147 * regular (including anonymous) commenters gain nothing beyond the inert 1148 * mention markup itself. 1149 * 1150 * @since 7.1.0 1151 * @access private 1152 * 1153 * @param array<string, array<string, bool>> $allowed The allowed tags structure for the context. 1154 * @param string $context The kses context. 1155 * @return array<string, array<string, bool>> Modified allowed tags structure. 1156 */ 1157 function _wp_kses_allow_note_mention_span( $allowed, $context ): array { 1158 if ( ! is_array( $allowed ) ) { 1159 $allowed = array(); 1160 } 1161 if ( 'pre_comment_content' !== $context ) { 1162 return $allowed; 1163 } 1164 1165 if ( ! isset( $allowed['span'] ) || ! is_array( $allowed['span'] ) ) { 1166 $allowed['span'] = array(); 1167 } 1168 1169 $allowed['span']['class'] = true; 1170 1171 return $allowed; 1172 } 1173 1174 /** 1175 * Reduces `span` classes in comment content to the note mention tokens. 1176 * 1177 * _wp_kses_allow_note_mention_span() lets `class` through kses on `span` so 1178 * the mention chip survives, but `class` is an open-ended styling and 1179 * scripting hook, so this companion pass - running right after 1180 * `wp_filter_kses` at priority 10 - strips every class token except the two 1181 * the mention markup uses: `wp-note-mention` and `user-N`. `span` is the only 1182 * comment tag allowed to carry `class` at all, so walking `span` tags covers 1183 * the entire allowance. 1184 * 1185 * The pass only applies while the restrictive comment allowlist is active: 1186 * users with `unfiltered_html` are filtered through `wp_filter_post_kses` 1187 * (or not at all), where arbitrary classes are already permitted, and 1188 * narrowing their markup here would restrict what core allows them to post. 1189 * 1190 * @since 7.1.0 1191 * @access private 1192 * 1193 * @param string $content Slashed comment content, already filtered by kses. 1194 * @return string Slashed comment content with span classes reduced. 1195 */ 1196 function _wp_kses_sanitize_note_mention_classes( $content ): string { 1197 if ( ! is_string( $content ) ) { 1198 $content = ''; 1199 } 1200 if ( false === has_filter( 'pre_comment_content', 'wp_filter_kses' ) ) { 1201 return $content; 1202 } 1203 1204 $processor = new WP_HTML_Tag_Processor( wp_unslash( $content ) ); 1205 1206 while ( $processor->next_tag( 'SPAN' ) ) { 1207 foreach ( $processor->class_list() as $token ) { 1208 if ( 'wp-note-mention' !== $token && ! preg_match( '/^user-[1-9][0-9]*$/', $token ) ) { 1209 // Removing the last class also removes the attribute itself. 1210 $processor->remove_class( $token ); 1211 } 1212 } 1213 } 1214 1215 return wp_slash( $processor->get_updated_html() ); 1216 } 1217 1218 /** 1219 * You add any KSES hooks here. 1220 * 1221 * There is currently only one KSES WordPress hook, {@see 'pre_kses'}, and it is called here. 1222 * All parameters are passed to the hooks and expected to receive a string. 1223 * 1224 * @since 1.0.0 1225 * 1226 * @param string $content Content to filter through KSES. 1227 * @param array[]|string $allowed_html An array of allowed HTML elements and attributes, 1228 * or a context name such as 'post'. See wp_kses_allowed_html() 1229 * for the list of accepted context names. 1230 * @param string[] $allowed_protocols Array of allowed URL protocols. 1231 * @return string Filtered content through {@see 'pre_kses'} hook. 1232 */ 1233 function wp_kses_hook( $content, $allowed_html, $allowed_protocols ) { 1234 /** 1235 * Filters content to be run through KSES. 1236 * 1237 * @since 2.3.0 1238 * 1239 * @param string $content Content to filter through KSES. 1240 * @param array[]|string $allowed_html An array of allowed HTML elements and attributes, 1241 * or a context name such as 'post'. See wp_kses_allowed_html() 1242 * for the list of accepted context names. 1243 * @param string[] $allowed_protocols Array of allowed URL protocols. 1244 */ 1245 return apply_filters( 'pre_kses', $content, $allowed_html, $allowed_protocols ); 1246 } 1247 1248 /** 1249 * Returns the version number of KSES. 1250 * 1251 * @since 1.0.0 1252 * 1253 * @return string KSES version number. 1254 */ 1255 function wp_kses_version() { 1256 return '0.2.2'; 1257 } 1258 1259 /** 1260 * Searches for HTML tags, no matter how malformed. 1261 * 1262 * It also matches stray `>` characters. 1263 * 1264 * @since 1.0.0 1265 * @since 6.6.0 Recognize additional forms of invalid HTML which convert into comments. 1266 * 1267 * @global array[]|string $pass_allowed_html An array of allowed HTML elements and attributes, 1268 * or a context name such as 'post'. 1269 * @global string[] $pass_allowed_protocols Array of allowed URL protocols. 1270 * 1271 * @param string $content Content to filter. 1272 * @param array[]|string $allowed_html An array of allowed HTML elements and attributes, 1273 * or a context name such as 'post'. See wp_kses_allowed_html() 1274 * for the list of accepted context names. 1275 * @param string[] $allowed_protocols Array of allowed URL protocols. 1276 * @return string Content with fixed HTML tags 1277 */ 1278 function wp_kses_split( $content, $allowed_html, $allowed_protocols ) { 1279 global $pass_allowed_html, $pass_allowed_protocols; 1280 1281 $pass_allowed_html = $allowed_html; 1282 $pass_allowed_protocols = $allowed_protocols; 1283 1284 $token_pattern = <<<REGEX 1285 ~ 1286 ( # Detect comments of various flavors before attempting to find tags. 1287 (<!--.*?(-->|$)) # - Normative HTML comments. 1288 | 1289 </[^a-zA-Z][^>]*> # - Closing tags with invalid tag names. 1290 | 1291 <![^>]*> # - Invalid markup declaration nodes. Not all invalid nodes 1292 # are matched so as to avoid breaking legacy behaviors. 1293 ) 1294 | 1295 (<[^>]*(>|$)|>) # Tag-like spans of text. 1296 ~x 1297 REGEX; 1298 return preg_replace_callback( $token_pattern, '_wp_kses_split_callback', $content ); 1299 } 1300 1301 /** 1302 * Returns an array of HTML attribute names whose value contains a URL. 1303 * 1304 * This function returns a list of all HTML attributes that must contain 1305 * a URL according to the HTML specification. 1306 * 1307 * This list includes URI attributes both allowed and disallowed by KSES. 1308 * 1309 * @link https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes 1310 * 1311 * @since 5.0.1 1312 * 1313 * @return string[] HTML attribute names whose value contains a URL. 1314 */ 1315 function wp_kses_uri_attributes() { 1316 $uri_attributes = array( 1317 'action', 1318 'archive', 1319 'background', 1320 'cite', 1321 'classid', 1322 'codebase', 1323 'data', 1324 'formaction', 1325 'href', 1326 'icon', 1327 'longdesc', 1328 'manifest', 1329 'poster', 1330 'profile', 1331 'src', 1332 'usemap', 1333 'xmlns', 1334 ); 1335 1336 /** 1337 * Filters the list of attributes that are required to contain a URL. 1338 * 1339 * Use this filter to add any `data-` attributes that are required to be 1340 * validated as a URL. 1341 * 1342 * @since 5.0.1 1343 * 1344 * @param string[] $uri_attributes HTML attribute names whose value contains a URL. 1345 */ 1346 $uri_attributes = apply_filters( 'wp_kses_uri_attributes', $uri_attributes ); 1347 1348 return $uri_attributes; 1349 } 1350 1351 /** 1352 * Callback for `wp_kses_split()`. 1353 * 1354 * @since 3.1.0 1355 * @access private 1356 * @ignore 1357 * 1358 * @global array[]|string $pass_allowed_html An array of allowed HTML elements and attributes, 1359 * or a context name such as 'post'. 1360 * @global string[] $pass_allowed_protocols Array of allowed URL protocols. 1361 * 1362 * @param array $matches preg_replace regexp matches 1363 * @return string 1364 */ 1365 function _wp_kses_split_callback( $matches ) { 1366 global $pass_allowed_html, $pass_allowed_protocols; 1367 1368 return wp_kses_split2( $matches[0], $pass_allowed_html, $pass_allowed_protocols ); 1369 } 1370 1371 /** 1372 * Callback for `wp_kses_split()` for fixing malformed HTML tags. 1373 * 1374 * This function does a lot of work. It rejects some very malformed things like 1375 * `<:::>`. It returns an empty string, if the element isn't allowed (look ma, no 1376 * `strip_tags()`!). Otherwise it splits the tag into an element and an attribute 1377 * list. 1378 * 1379 * After the tag is split into an element and an attribute list, it is run 1380 * through another filter which will remove illegal attributes and once that is 1381 * completed, will be returned. 1382 * 1383 * @access private 1384 * @ignore 1385 * @since 1.0.0 1386 * @since 6.6.0 Recognize additional forms of invalid HTML which convert into comments. 1387 * 1388 * @param string $content Content to filter. 1389 * @param array[]|string $allowed_html An array of allowed HTML elements and attributes, 1390 * or a context name such as 'post'. See wp_kses_allowed_html() 1391 * for the list of accepted context names. 1392 * @param string[] $allowed_protocols Array of allowed URL protocols. 1393 * @return string Fixed HTML element 1394 */ 1395 function wp_kses_split2( $content, $allowed_html, $allowed_protocols ) { 1396 $content = wp_kses_stripslashes( $content ); 1397 1398 /* 1399 * The regex pattern used to split HTML into chunks attempts 1400 * to split on HTML token boundaries. This function should 1401 * thus receive chunks that _either_ start with meaningful 1402 * syntax tokens, like a tag `<div>` or a comment `<!-- ... -->`. 1403 * 1404 * If the first character of the `$content` chunk _isn't_ one 1405 * of these syntax elements, which always starts with `<`, then 1406 * the match had to be for the final alternation of `>`. In such 1407 * case, it's probably standing on its own and could be encoded 1408 * with a character reference to remove ambiguity. 1409 * 1410 * In other words, if this chunk isn't from a match of a syntax 1411 * token, it's just a plaintext greater-than (`>`) sign. 1412 */ 1413 if ( ! str_starts_with( $content, '<' ) ) { 1414 return '>'; 1415 } 1416 1417 /* 1418 * When certain invalid syntax constructs appear, the HTML parser 1419 * shifts into what's called the "bogus comment state." This is a 1420 * plaintext state that consumes everything until the nearest `>` 1421 * and then transforms the entire span into an HTML comment. 1422 * 1423 * Preserve these comments and do not treat them like tags. 1424 * 1425 * @see https://html.spec.whatwg.org/#bogus-comment-state 1426 */ 1427 if ( 1 === preg_match( '~^(?:</[^a-zA-Z][^>]*>|<![a-z][^>]*>)$~', $content ) ) { 1428 /** 1429 * Since the pattern matches `</…>` and also `<!…>`, this will 1430 * preserve the type of the cleaned-up token in the output. 1431 */ 1432 $opener = $content[1]; 1433 $content = substr( $content, 2, -1 ); 1434 1435 do { 1436 $prev = $content; 1437 $content = wp_kses( $content, $allowed_html, $allowed_protocols ); 1438 } while ( $prev !== $content ); 1439 1440 // Recombine the modified inner content with the original token structure. 1441 return "<{$opener}{$content}>"; 1442 } 1443 1444 /* 1445 * Normative HTML comments should be handled separately as their 1446 * parsing rules differ from those for tags and text nodes. 1447 */ 1448 if ( str_starts_with( $content, '<!--' ) ) { 1449 $content = str_replace( array( '<!--', '-->' ), '', $content ); 1450 1451 while ( ( $newstring = wp_kses( $content, $allowed_html, $allowed_protocols ) ) !== $content ) { 1452 $content = $newstring; 1453 } 1454 1455 if ( '' === $content ) { 1456 return ''; 1457 } 1458 1459 // Prevent multiple dashes in comments. 1460 $content = preg_replace( '/--+/', '-', $content ); 1461 // Prevent three dashes closing a comment. 1462 $content = preg_replace( '/-$/', '', $content ); 1463 1464 return "<!--{$content}-->"; 1465 } 1466 1467 // It's seriously malformed. 1468 if ( ! preg_match( '%^<\s*(/\s*)?([a-zA-Z0-9-]+)([^>]*)>?$%', $content, $matches ) ) { 1469 return ''; 1470 } 1471 1472 $slash = trim( $matches[1] ); 1473 $elem = $matches[2]; 1474 $attrlist = $matches[3]; 1475 1476 if ( ! is_array( $allowed_html ) ) { 1477 $allowed_html = wp_kses_allowed_html( $allowed_html ); 1478 } 1479 1480 // They are using a not allowed HTML element. 1481 if ( ! isset( $allowed_html[ strtolower( $elem ) ] ) ) { 1482 return ''; 1483 } 1484 1485 // No attributes are allowed for closing elements. 1486 if ( '' !== $slash ) { 1487 return "</$elem>"; 1488 } 1489 1490 return wp_kses_attr( $elem, $attrlist, $allowed_html, $allowed_protocols ); 1491 } 1492 1493 /** 1494 * Removes all attributes, if none are allowed for this element. 1495 * 1496 * If some are allowed it calls `wp_kses_hair()` to split them further, and then 1497 * it builds up new HTML code from the data that `wp_kses_hair()` returns. It also 1498 * removes `<` and `>` characters, if there are any left. One more thing it does 1499 * is to check if the tag has a closing XHTML slash, and if it does, it puts one 1500 * in the returned code as well. 1501 * 1502 * An array of allowed values can be defined for attributes. If the attribute value 1503 * doesn't fall into the list, the attribute will be removed from the tag. 1504 * 1505 * Attributes can be marked as required. If a required attribute is not present, 1506 * KSES will remove all attributes from the tag. As KSES doesn't match opening and 1507 * closing tags, it's not possible to safely remove the tag itself, the safest 1508 * fallback is to strip all attributes from the tag, instead. 1509 * 1510 * @since 1.0.0 1511 * @since 5.9.0 Added support for an array of allowed values for attributes. 1512 * Added support for required attributes. 1513 * 1514 * @param string $element HTML element/tag. 1515 * @param string $attr HTML attributes from HTML element to closing HTML element tag. 1516 * @param array[]|string $allowed_html An array of allowed HTML elements and attributes, 1517 * or a context name such as 'post'. See wp_kses_allowed_html() 1518 * for the list of accepted context names. 1519 * @param string[] $allowed_protocols Array of allowed URL protocols. 1520 * @return string Sanitized HTML element. 1521 */ 1522 function wp_kses_attr( $element, $attr, $allowed_html, $allowed_protocols ) { 1523 if ( ! is_array( $allowed_html ) ) { 1524 $allowed_html = wp_kses_allowed_html( $allowed_html ); 1525 } 1526 1527 // Is there a closing XHTML slash at the end of the attributes? 1528 $xhtml_slash = ''; 1529 if ( preg_match( '%\s*/\s*$%', $attr ) ) { 1530 $xhtml_slash = ' /'; 1531 } 1532 1533 // Are any attributes allowed at all for this element? 1534 $element_low = strtolower( $element ); 1535 if ( empty( $allowed_html[ $element_low ] ) || true === $allowed_html[ $element_low ] ) { 1536 return "<$element$xhtml_slash>"; 1537 } 1538 1539 // Split it. 1540 $attrarr = wp_kses_hair( $attr, $allowed_protocols ); 1541 1542 // Check if there are attributes that are required. 1543 $required_attrs = array_filter( 1544 $allowed_html[ $element_low ], 1545 static function ( $required_attr_limits ) { 1546 return isset( $required_attr_limits['required'] ) && true === $required_attr_limits['required']; 1547 } 1548 ); 1549 1550 /* 1551 * If a required attribute check fails, we can return nothing for a self-closing tag, 1552 * but for a non-self-closing tag the best option is to return the element with attributes, 1553 * as KSES doesn't handle matching the relevant closing tag. 1554 */ 1555 $stripped_tag = ''; 1556 if ( empty( $xhtml_slash ) ) { 1557 $stripped_tag = "<$element>"; 1558 } 1559 1560 // Go through $attrarr, and save the allowed attributes for this element in $attr2. 1561 $attr2 = ''; 1562 foreach ( $attrarr as $arreach ) { 1563 // Check if this attribute is required. 1564 $required = isset( $required_attrs[ strtolower( $arreach['name'] ) ] ); 1565 1566 if ( wp_kses_attr_check( $arreach['name'], $arreach['value'], $arreach['whole'], $arreach['vless'], $element, $allowed_html ) ) { 1567 $attr2 .= ' ' . $arreach['whole']; 1568 1569 // If this was a required attribute, we can mark it as found. 1570 if ( $required ) { 1571 unset( $required_attrs[ strtolower( $arreach['name'] ) ] ); 1572 } 1573 } elseif ( $required ) { 1574 // This attribute was required, but didn't pass the check. The entire tag is not allowed. 1575 return $stripped_tag; 1576 } 1577 } 1578 1579 // If some required attributes weren't set, the entire tag is not allowed. 1580 if ( ! empty( $required_attrs ) ) { 1581 return $stripped_tag; 1582 } 1583 1584 // Remove any "<" or ">" characters. 1585 $attr2 = preg_replace( '/[<>]/', '', $attr2 ); 1586 1587 return "<$element$attr2$xhtml_slash>"; 1588 } 1589 1590 /** 1591 * Determines whether an attribute is allowed. 1592 * 1593 * @since 4.2.3 1594 * @since 5.0.0 Added support for `data-*` wildcard attributes. 1595 * 1596 * @param string $name The attribute name. Passed by reference. Returns empty string when not allowed. 1597 * @param string $value The attribute value. Passed by reference. Returns a filtered value. 1598 * @param string $whole The `name=value` input. Passed by reference. Returns filtered input. 1599 * @param string $vless Whether the attribute is valueless. Use 'y' or 'n'. 1600 * @param string $element The name of the element to which this attribute belongs. 1601 * @param array $allowed_html The full list of allowed elements and attributes. 1602 * @return bool Whether or not the attribute is allowed. 1603 */ 1604 function wp_kses_attr_check( &$name, &$value, &$whole, $vless, $element, $allowed_html ) { 1605 $name_low = strtolower( $name ); 1606 $element_low = strtolower( $element ); 1607 1608 if ( ! isset( $allowed_html[ $element_low ] ) ) { 1609 $name = ''; 1610 $value = ''; 1611 $whole = ''; 1612 return false; 1613 } 1614 1615 $allowed_attr = $allowed_html[ $element_low ]; 1616 1617 if ( ! isset( $allowed_attr[ $name_low ] ) || '' === $allowed_attr[ $name_low ] ) { 1618 /* 1619 * Allow `data-*` attributes. 1620 * 1621 * When specifying `$allowed_html`, the attribute name should be set as 1622 * `data-*` (not to be mixed with the HTML 4.0 `data` attribute, see 1623 * https://www.w3.org/TR/html40/struct/objects.html#adef-data). 1624 * 1625 * Note: the attribute name should only contain `A-Za-z0-9_-` chars. 1626 */ 1627 if ( str_starts_with( $name_low, 'data-' ) && ! empty( $allowed_attr['data-*'] ) 1628 && preg_match( '/^data-[a-z0-9_-]+$/', $name_low, $match ) 1629 ) { 1630 /* 1631 * Add the whole attribute name to the allowed attributes and set any restrictions 1632 * for the `data-*` attribute values for the current element. 1633 */ 1634 $allowed_attr[ $match[0] ] = $allowed_attr['data-*']; 1635 } else { 1636 $name = ''; 1637 $value = ''; 1638 $whole = ''; 1639 return false; 1640 } 1641 } 1642 1643 if ( 'style' === $name_low ) { 1644 $decoded_value = WP_HTML_Decoder::decode_attribute( $value ); 1645 $new_value = safecss_filter_attr( $decoded_value ); 1646 1647 if ( empty( $new_value ) ) { 1648 $name = ''; 1649 $value = ''; 1650 $whole = ''; 1651 return false; 1652 } 1653 1654 if ( $new_value !== $decoded_value ) { 1655 $encoded_value = esc_attr( $new_value ); 1656 $whole = str_replace( $value, $encoded_value, $whole ); 1657 $value = $encoded_value; 1658 } 1659 } 1660 1661 if ( is_array( $allowed_attr[ $name_low ] ) ) { 1662 // There are some checks. 1663 foreach ( $allowed_attr[ $name_low ] as $currkey => $currval ) { 1664 if ( ! wp_kses_check_attr_val( $value, $vless, $currkey, $currval ) ) { 1665 $name = ''; 1666 $value = ''; 1667 $whole = ''; 1668 return false; 1669 } 1670 } 1671 } 1672 1673 return true; 1674 } 1675 1676 /** 1677 * Given a string of HTML attributes and values, parse into a structured attribute list. 1678 * 1679 * This function performs a number of transformations while parsing attribute strings: 1680 * - It normalizes attribute values and surrounds them with double quotes. 1681 * - It normalizes HTML character references inside attribute values. 1682 * - It removes “bad” URL protocols from attribute values. 1683 * 1684 * Otherwise this reads the attributes as if they were part of an HTML tag. It performs 1685 * these transformations to lower the risk of mis-parsing down the line and to perform 1686 * URL sanitization in line with the rest of the `kses` subsystem. Importantly, it does 1687 * not decode the attribute values, meaning that special HTML syntax characters will 1688 * be left with character references in the `value` property. 1689 * 1690 * Example: 1691 * 1692 * $attrs = wp_kses_hair( 'class="is-wide" inert data-lazy=\'<img>\' =/🐮=/' ); 1693 * $attrs === array( 1694 * 'class' => array( 'name' => 'class', 'value' => 'is-wide', 'whole' => 'class="is-wide"', 'vless' => 'n' ), 1695 * 'inert' => array( 'name' => 'inert', 'value' => '', 'whole' => 'inert', 'vless' => 'y' ), 1696 * 'data-lazy' => array( 'name' => 'data-lazy', 'value' => '<img>', 'whole' => 'data-lazy="<img>"', 'vless' => 'n' ), 1697 * '=' => array( 'name' => '=', 'value' => '', 'whole' => '=', 'vless' => 'y' ), 1698 * '🐮' => array( 'name' => '🐮', 'value' => '/', 'whole' => '🐮="/"', 'vless' => 'n' ), 1699 * ); 1700 * 1701 * @since 1.0.0 1702 * @since 7.0.0 Reliably parses HTML via the HTML API. 1703 * 1704 * @param string $attr Attribute list from HTML element to closing HTML element tag. 1705 * @param string[] $allowed_protocols Array of allowed URL protocols. 1706 * @return array<string, array{name: string, value: string, whole: string, vless: 'y'|'n'}> Array of attribute information after parsing. 1707 */ 1708 function wp_kses_hair( $attr, $allowed_protocols ) { 1709 $attributes = array(); 1710 $uris = wp_kses_uri_attributes(); 1711 1712 $processor = new WP_HTML_Tag_Processor( "<wp {$attr}>" ); 1713 $processor->next_token(); 1714 1715 $attribute_names = $processor->get_attribute_names_with_prefix( '' ); 1716 if ( null === $attribute_names || 0 === count( $attribute_names ) ) { 1717 return $attributes; 1718 } 1719 1720 $syntax_characters = array( 1721 '&' => '&', 1722 '<' => '<', 1723 '>' => '>', 1724 "'" => ''', 1725 '"' => '"', 1726 ); 1727 1728 foreach ( $attribute_names as $name ) { 1729 $value = $processor->get_attribute( $name ); 1730 $is_bool = true === $value; 1731 if ( is_string( $value ) && in_array( $name, $uris, true ) ) { 1732 $value = wp_kses_bad_protocol( $value, $allowed_protocols ); 1733 } 1734 1735 // Reconstruct and normalize the attribute value. 1736 $recoded = $is_bool ? '' : strtr( $value, $syntax_characters ); 1737 $whole = $is_bool ? $name : "{$name}=\"{$recoded}\""; 1738 1739 $attributes[ $name ] = array( 1740 'name' => $name, 1741 'value' => $recoded, 1742 'whole' => $whole, 1743 'vless' => $is_bool ? 'y' : 'n', 1744 ); 1745 } 1746 1747 return $attributes; 1748 } 1749 1750 /** 1751 * Finds all attributes of an HTML element. 1752 * 1753 * Does not modify input. May return "evil" output. 1754 * 1755 * Based on `wp_kses_split2()` and `wp_kses_attr()`. 1756 * 1757 * @since 4.2.3 1758 * 1759 * @param string $element HTML element. 1760 * @return array|false List of attributes found in the element. Returns false on failure. 1761 */ 1762 function wp_kses_attr_parse( $element ) { 1763 $valid = preg_match( '%^(<\s*)(/\s*)?([a-zA-Z0-9]+\s*)([^>]*)(>?)$%', $element, $matches ); 1764 if ( 1 !== $valid ) { 1765 return false; 1766 } 1767 1768 $begin = $matches[1]; 1769 $slash = $matches[2]; 1770 $elname = $matches[3]; 1771 $attr = $matches[4]; 1772 $end = $matches[5]; 1773 1774 if ( '' !== $slash ) { 1775 // Closing elements do not get parsed. 1776 return false; 1777 } 1778 1779 // Is there a closing XHTML slash at the end of the attributes? 1780 if ( 1 === preg_match( '%\s*/\s*$%', $attr, $matches ) ) { 1781 $xhtml_slash = $matches[0]; 1782 $attr = substr( $attr, 0, -strlen( $xhtml_slash ) ); 1783 } else { 1784 $xhtml_slash = ''; 1785 } 1786 1787 // Split it. 1788 $attrarr = wp_kses_hair_parse( $attr ); 1789 if ( false === $attrarr ) { 1790 return false; 1791 } 1792 1793 // Make sure all input is returned by adding front and back matter. 1794 array_unshift( $attrarr, $begin . $slash . $elname ); 1795 array_push( $attrarr, $xhtml_slash . $end ); 1796 1797 return $attrarr; 1798 } 1799 1800 /** 1801 * Builds an attribute list from string containing attributes. 1802 * 1803 * Does not modify input. May return "evil" output. 1804 * In case of unexpected input, returns false instead of stripping things. 1805 * 1806 * Based on `wp_kses_hair()` but does not return a multi-dimensional array. 1807 * 1808 * @since 4.2.3 1809 * 1810 * @param string $attr Attribute list from HTML element to closing HTML element tag. 1811 * @return array|false List of attributes found in $attr. Returns false on failure. 1812 */ 1813 function wp_kses_hair_parse( $attr ) { 1814 if ( '' === $attr ) { 1815 return array(); 1816 } 1817 1818 $regex = 1819 '(?: 1820 [_a-zA-Z][-_a-zA-Z0-9:.]* # Attribute name. 1821 | 1822 \[\[?[^\[\]]+\]\]? # Shortcode in the name position implies unfiltered_html. 1823 ) 1824 (?: # Attribute value. 1825 \s*=\s* # All values begin with "=". 1826 (?: 1827 "[^"]*" # Double-quoted. 1828 | 1829 \'[^\']*\' # Single-quoted. 1830 | 1831 [^\s"\']+ # Non-quoted. 1832 (?:\s|$) # Must have a space. 1833 ) 1834 | 1835 (?:\s|$) # If attribute has no value, space is required. 1836 ) 1837 \s* # Trailing space is optional except as mentioned above. 1838 '; 1839 1840 /* 1841 * Although it is possible to reduce this procedure to a single regexp, 1842 * we must run that regexp twice to get exactly the expected result. 1843 * 1844 * Note: do NOT remove the `x` modifiers as they are essential for the above regex! 1845 */ 1846 1847 $validation = "/^($regex)+$/x"; 1848 $extraction = "/$regex/x"; 1849 1850 if ( 1 === preg_match( $validation, $attr ) ) { 1851 preg_match_all( $extraction, $attr, $attrarr ); 1852 return $attrarr[0]; 1853 } else { 1854 return false; 1855 } 1856 } 1857 1858 /** 1859 * Performs different checks for attribute values. 1860 * 1861 * The currently implemented checks are "maxlen", "minlen", "maxval", "minval", 1862 * and "valueless". 1863 * 1864 * @since 1.0.0 1865 * 1866 * @param string $value Attribute value. 1867 * @param string $vless Whether the attribute is valueless. Use 'y' or 'n'. 1868 * @param string $checkname What $checkvalue is checking for. 1869 * @param mixed $checkvalue What constraint the value should pass. 1870 * @return bool Whether check passes. 1871 */ 1872 function wp_kses_check_attr_val( $value, $vless, $checkname, $checkvalue ) { 1873 $ok = true; 1874 1875 switch ( strtolower( $checkname ) ) { 1876 case 'maxlen': 1877 /* 1878 * The maxlen check makes sure that the attribute value has a length not 1879 * greater than the given value. This can be used to avoid Buffer Overflows 1880 * in WWW clients and various Internet servers. 1881 */ 1882 1883 if ( strlen( $value ) > $checkvalue ) { 1884 $ok = false; 1885 } 1886 break; 1887 1888 case 'minlen': 1889 /* 1890 * The minlen check makes sure that the attribute value has a length not 1891 * smaller than the given value. 1892 */ 1893 1894 if ( strlen( $value ) < $checkvalue ) { 1895 $ok = false; 1896 } 1897 break; 1898 1899 case 'maxval': 1900 /* 1901 * The maxval check does two things: it checks that the attribute value is 1902 * an integer from 0 and up, without an excessive amount of zeroes or 1903 * whitespace (to avoid Buffer Overflows). It also checks that the attribute 1904 * value is not greater than the given value. 1905 * This check can be used to avoid Denial of Service attacks. 1906 */ 1907 1908 if ( ! preg_match( '/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value ) ) { 1909 $ok = false; 1910 } 1911 if ( $value > $checkvalue ) { 1912 $ok = false; 1913 } 1914 break; 1915 1916 case 'minval': 1917 /* 1918 * The minval check makes sure that the attribute value is a positive integer, 1919 * and that it is not smaller than the given value. 1920 */ 1921 1922 if ( ! preg_match( '/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value ) ) { 1923 $ok = false; 1924 } 1925 if ( $value < $checkvalue ) { 1926 $ok = false; 1927 } 1928 break; 1929 1930 case 'valueless': 1931 /* 1932 * The valueless check makes sure if the attribute has a value 1933 * (like `<a href="blah">`) or not (`<option selected>`). If the given value 1934 * is a "y" or a "Y", the attribute must not have a value. 1935 * If the given value is an "n" or an "N", the attribute must have a value. 1936 */ 1937 1938 if ( strtolower( $checkvalue ) !== $vless ) { 1939 $ok = false; 1940 } 1941 break; 1942 1943 case 'values': 1944 /* 1945 * The values check is used when you want to make sure that the attribute 1946 * has one of the given values. 1947 */ 1948 1949 if ( ! in_array( strtolower( $value ), $checkvalue, true ) ) { 1950 $ok = false; 1951 } 1952 break; 1953 1954 case 'value_callback': 1955 /* 1956 * The value_callback check is used when you want to make sure that the attribute 1957 * value is accepted by the callback function. 1958 */ 1959 1960 if ( ! call_user_func( $checkvalue, $value ) ) { 1961 $ok = false; 1962 } 1963 break; 1964 } // End switch. 1965 1966 return $ok; 1967 } 1968 1969 /** 1970 * Sanitizes a string and removed disallowed URL protocols. 1971 * 1972 * This function removes all non-allowed protocols from the beginning of the 1973 * string. It ignores whitespace and the case of the letters, and it does 1974 * understand HTML entities. It does its work recursively, so it won't be 1975 * fooled by a string like `javascript:javascript:alert(57)`. 1976 * 1977 * @since 1.0.0 1978 * 1979 * @param string $content Content to filter bad protocols from. 1980 * @param string[] $allowed_protocols Array of allowed URL protocols. 1981 * @return string Filtered content. 1982 */ 1983 function wp_kses_bad_protocol( $content, $allowed_protocols ) { 1984 $content = wp_kses_no_null( $content ); 1985 1986 // Short-circuit if the string starts with `https://` or `http://`. Most common cases. 1987 if ( 1988 ( str_starts_with( $content, 'https://' ) && in_array( 'https', $allowed_protocols, true ) ) || 1989 ( str_starts_with( $content, 'http://' ) && in_array( 'http', $allowed_protocols, true ) ) 1990 ) { 1991 return $content; 1992 } 1993 1994 $iterations = 0; 1995 1996 do { 1997 $original_content = $content; 1998 $content = wp_kses_bad_protocol_once( $content, $allowed_protocols ); 1999 } while ( $original_content !== $content && ++$iterations < 6 ); 2000 2001 if ( $original_content !== $content ) { 2002 return ''; 2003 } 2004 2005 return $content; 2006 } 2007 2008 /** 2009 * Removes any invalid control characters in a text string. 2010 * 2011 * Also removes any instance of the `\0` string. 2012 * 2013 * @since 1.0.0 2014 * 2015 * @param string $content Content to filter null characters from. 2016 * @param array $options Set 'slash_zero' => 'keep' when '\0' is allowed. Default is 'remove'. 2017 * @return string Filtered content. 2018 */ 2019 function wp_kses_no_null( $content, $options = null ) { 2020 if ( ! isset( $options['slash_zero'] ) ) { 2021 $options = array( 'slash_zero' => 'remove' ); 2022 } 2023 2024 $content = preg_replace( '/[\x00-\x08\x0B\x0C\x0E-\x1F]/', '', $content ); 2025 if ( 'remove' === $options['slash_zero'] ) { 2026 $content = preg_replace( '/\\\\+0+/', '', $content ); 2027 } 2028 2029 return $content; 2030 } 2031 2032 /** 2033 * Strips slashes from in front of quotes. 2034 * 2035 * This function changes the character sequence `\"` to just `"`. It leaves all other 2036 * slashes alone. The quoting from `preg_replace(//e)` requires this. 2037 * 2038 * @since 1.0.0 2039 * 2040 * @param string $content String to strip slashes from. 2041 * @return string Fixed string with quoted slashes. 2042 */ 2043 function wp_kses_stripslashes( $content ) { 2044 return preg_replace( '%\\\\"%', '"', $content ); 2045 } 2046 2047 /** 2048 * Converts the keys of an array to lowercase. 2049 * 2050 * @since 1.0.0 2051 * 2052 * @param array $inarray Unfiltered array. 2053 * @return array Fixed array with all lowercase keys. 2054 */ 2055 function wp_kses_array_lc( $inarray ) { 2056 $outarray = array(); 2057 2058 foreach ( (array) $inarray as $inkey => $inval ) { 2059 $outkey = strtolower( $inkey ); 2060 $outarray[ $outkey ] = array(); 2061 2062 foreach ( (array) $inval as $inkey2 => $inval2 ) { 2063 $outkey2 = strtolower( $inkey2 ); 2064 $outarray[ $outkey ][ $outkey2 ] = $inval2; 2065 } 2066 } 2067 2068 return $outarray; 2069 } 2070 2071 /** 2072 * Sanitizes content from bad protocols and other characters. 2073 * 2074 * This function searches for URL protocols at the beginning of the string, while 2075 * handling whitespace and HTML entities. 2076 * 2077 * @since 1.0.0 2078 * 2079 * @param string $content Content to check for bad protocols. 2080 * @param string[] $allowed_protocols Array of allowed URL protocols. 2081 * @param int $count Depth of call recursion to this function. 2082 * @return string Sanitized content. 2083 */ 2084 function wp_kses_bad_protocol_once( $content, $allowed_protocols, $count = 1 ) { 2085 $content = preg_replace( '/(�*58(?![;0-9])|�*3a(?![;a-f0-9]))/i', '$1;', $content ); 2086 $content2 = preg_split( '/:|�*58;|�*3a;|:/i', $content, 2 ); 2087 2088 if ( isset( $content2[1] ) && ! preg_match( '%/\?%', $content2[0] ) ) { 2089 $content = trim( $content2[1] ); 2090 $protocol = wp_kses_bad_protocol_once2( $content2[0], $allowed_protocols ); 2091 if ( 'feed:' === $protocol ) { 2092 if ( $count > 2 ) { 2093 return ''; 2094 } 2095 $content = wp_kses_bad_protocol_once( $content, $allowed_protocols, ++$count ); 2096 if ( empty( $content ) ) { 2097 return $content; 2098 } 2099 } 2100 $content = $protocol . $content; 2101 } 2102 2103 return $content; 2104 } 2105 2106 /** 2107 * Callback for `wp_kses_bad_protocol_once()` regular expression. 2108 * 2109 * This function processes URL protocols, checks to see if they're in the 2110 * list of allowed protocols or not, and returns different data depending 2111 * on the answer. 2112 * 2113 * @access private 2114 * @ignore 2115 * @since 1.0.0 2116 * 2117 * @param string $scheme URI scheme to check against the list of allowed protocols. 2118 * @param string[] $allowed_protocols Array of allowed URL protocols. 2119 * @return string Sanitized content. 2120 */ 2121 function wp_kses_bad_protocol_once2( $scheme, $allowed_protocols ) { 2122 $scheme = wp_kses_decode_entities( $scheme ); 2123 $scheme = preg_replace( '/\s/', '', $scheme ); 2124 $scheme = wp_kses_no_null( $scheme ); 2125 $scheme = strtolower( $scheme ); 2126 2127 $allowed = array_any( (array) $allowed_protocols, fn( $protocol ) => strtolower( $protocol ) === $scheme ); 2128 2129 if ( $allowed ) { 2130 return "$scheme:"; 2131 } else { 2132 return ''; 2133 } 2134 } 2135 2136 /** 2137 * Converts and fixes HTML entities. 2138 * 2139 * This function normalizes HTML entities. It will convert `AT&T` to the correct 2140 * `AT&T`, `:` to `:`, `&#XYZZY;` to `&#XYZZY;` and so on. 2141 * 2142 * When `$context` is set to 'xml', HTML entities are converted to their code points. For 2143 * example, `AT&T…&#XYZZY;` is converted to `AT&T…&#XYZZY;`. 2144 * 2145 * @since 1.0.0 2146 * @since 5.5.0 Added `$context` parameter. 2147 * 2148 * @param string $content Content to normalize entities. 2149 * @param string $context Context for normalization. Can be either 'html' or 'xml'. 2150 * Default 'html'. 2151 * @return string Content with normalized entities. 2152 */ 2153 function wp_kses_normalize_entities( $content, $context = 'html' ) { 2154 // Disarm all entities by converting & to & 2155 $content = str_replace( '&', '&', $content ); 2156 2157 /* 2158 * Decode any character references that are now double-encoded. 2159 * 2160 * It's important that the following normalizations happen in the correct order. 2161 * 2162 * At this point, all `&` have been transformed to `&`. Double-encoded named character 2163 * references like `&amp;` will be decoded back to their single-encoded form `&`. 2164 * 2165 * First, numeric (decimal and hexadecimal) character references must be handled so that 2166 * `&#09;` becomes `	`. If the named character references were handled first, there 2167 * would be no way to know whether the double-encoded character reference had been produced 2168 * in this function or was the original input. 2169 * 2170 * Consider the two examples, first with named entity decoding followed by numeric 2171 * entity decoding. We'll use U+002E FULL STOP (.) in our example, this table follows the 2172 * string processing from left to right: 2173 * 2174 * | Input | &-encoded | Named ref double-decoded | Numeric ref double-decoded | 2175 * | ------------ | ---------------- | ------------------------- | -------------------------- | 2176 * | `.` | `&#x2E;` | `&#x2E;` | `.` | 2177 * | `&#x2E;` | `&amp;#x2E;` | `&#x2E;` | `.` | 2178 * 2179 * Notice in the example above that different inputs result in the same result. The second case 2180 * was not normalized and produced HTML that is semantically different from the input. 2181 * 2182 * | Input | &-encoded | Numeric ref double-decoded | Named ref double-decoded | 2183 * | ------------ | ---------------- | --------------------------- | ------------------------ | 2184 * | `.` | `&#x2E;` | `.` | `.` | 2185 * | `&#x2E;` | `&amp;#x2E;` | `&amp;#x2E;` | `&#x2E;` | 2186 * 2187 * Here, each input is normalized to an appropriate output. 2188 */ 2189 $content = preg_replace_callback( '/&#(0*[1-9][0-9]{0,6});/', 'wp_kses_normalize_entities2', $content ); 2190 $content = preg_replace_callback( '/&#[Xx](0*[1-9A-Fa-f][0-9A-Fa-f]{0,5});/', 'wp_kses_normalize_entities3', $content ); 2191 if ( 'xml' === $context ) { 2192 $content = preg_replace_callback( '/&([A-Za-z]{2,8}[0-9]{0,2});/', 'wp_kses_xml_named_entities', $content ); 2193 } else { 2194 $content = preg_replace_callback( '/&([A-Za-z]{2,8}[0-9]{0,2});/', 'wp_kses_named_entities', $content ); 2195 } 2196 2197 return $content; 2198 } 2199 2200 /** 2201 * Callback for `wp_kses_normalize_entities()` regular expression. 2202 * 2203 * This function only accepts valid named entity references, which are finite, 2204 * case-sensitive, and highly scrutinized by HTML and XML validators. 2205 * 2206 * @since 3.0.0 2207 * 2208 * @global array $allowedentitynames 2209 * 2210 * @param array $matches preg_replace_callback() matches array. 2211 * @return string Correctly encoded entity. 2212 */ 2213 function wp_kses_named_entities( $matches ) { 2214 global $allowedentitynames; 2215 2216 if ( empty( $matches[1] ) ) { 2217 return ''; 2218 } 2219 2220 $i = $matches[1]; 2221 return ( ! in_array( $i, $allowedentitynames, true ) ) ? "&$i;" : "&$i;"; 2222 } 2223 2224 /** 2225 * Callback for `wp_kses_normalize_entities()` regular expression. 2226 * 2227 * This function only accepts valid named entity references, which are finite, 2228 * case-sensitive, and highly scrutinized by XML validators. HTML named entity 2229 * references are converted to their code points. 2230 * 2231 * @since 5.5.0 2232 * 2233 * @global array $allowedentitynames 2234 * @global array $allowedxmlentitynames 2235 * 2236 * @param array $matches preg_replace_callback() matches array. 2237 * @return string Correctly encoded entity. 2238 */ 2239 function wp_kses_xml_named_entities( $matches ) { 2240 global $allowedentitynames, $allowedxmlentitynames; 2241 2242 if ( empty( $matches[1] ) ) { 2243 return ''; 2244 } 2245 2246 $i = $matches[1]; 2247 2248 if ( in_array( $i, $allowedxmlentitynames, true ) ) { 2249 return "&$i;"; 2250 } elseif ( in_array( $i, $allowedentitynames, true ) ) { 2251 return html_entity_decode( "&$i;", ENT_HTML5 ); 2252 } 2253 2254 return "&$i;"; 2255 } 2256 2257 /** 2258 * Callback for `wp_kses_normalize_entities()` regular expression. 2259 * 2260 * This function helps `wp_kses_normalize_entities()` to only accept 16-bit 2261 * values and nothing more for `&#number;` entities. 2262 * 2263 * @access private 2264 * @ignore 2265 * @since 1.0.0 2266 * 2267 * @param array $matches `preg_replace_callback()` matches array. 2268 * @return string Correctly encoded entity. 2269 */ 2270 function wp_kses_normalize_entities2( $matches ) { 2271 if ( empty( $matches[1] ) ) { 2272 return ''; 2273 } 2274 2275 $i = $matches[1]; 2276 2277 if ( valid_unicode( $i ) ) { 2278 $i = str_pad( ltrim( $i, '0' ), 3, '0', STR_PAD_LEFT ); 2279 $i = "&#$i;"; 2280 } else { 2281 $i = "&#$i;"; 2282 } 2283 2284 return $i; 2285 } 2286 2287 /** 2288 * Callback for `wp_kses_normalize_entities()` for regular expression. 2289 * 2290 * This function helps `wp_kses_normalize_entities()` to only accept valid Unicode 2291 * numeric entities in hex form. 2292 * 2293 * @since 2.7.0 2294 * @access private 2295 * @ignore 2296 * 2297 * @param array $matches `preg_replace_callback()` matches array. 2298 * @return string Correctly encoded entity. 2299 */ 2300 function wp_kses_normalize_entities3( $matches ) { 2301 if ( empty( $matches[1] ) ) { 2302 return ''; 2303 } 2304 2305 $hexchars = $matches[1]; 2306 2307 return ( ! valid_unicode( hexdec( $hexchars ) ) ) ? "&#x$hexchars;" : '&#x' . ltrim( $hexchars, '0' ) . ';'; 2308 } 2309 2310 /** 2311 * Determines if a Unicode codepoint is valid. 2312 * 2313 * The definition of a valid Unicode codepoint is taken from the XML definition: 2314 * 2315 * > Characters 2316 * > 2317 * > … 2318 * > Legal characters are tab, carriage return, line feed, and the legal characters of 2319 * > Unicode and ISO/IEC 10646. 2320 * > … 2321 * > Char ::= #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF] 2322 * 2323 * @since 2.7.0 2324 * 2325 * @see https://www.w3.org/TR/xml/#charsets 2326 * 2327 * @param int $i Unicode codepoint. 2328 * @return bool Whether or not the codepoint is a valid Unicode codepoint. 2329 */ 2330 function valid_unicode( $i ) { 2331 $i = (int) $i; 2332 2333 return ( 2334 0x9 === $i || // U+0009 HORIZONTAL TABULATION (HT) 2335 0xA === $i || // U+000A LINE FEED (LF) 2336 0xD === $i || // U+000D CARRIAGE RETURN (CR) 2337 /* 2338 * The valid Unicode characters according to the XML specification: 2339 * 2340 * > any Unicode character, excluding the surrogate blocks, FFFE, and FFFF. 2341 */ 2342 ( 0x20 <= $i && $i <= 0xD7FF ) || 2343 ( 0xE000 <= $i && $i <= 0xFFFD ) || 2344 ( 0x10000 <= $i && $i <= 0x10FFFF ) 2345 ); 2346 } 2347 2348 /** 2349 * Converts all numeric HTML entities to their named counterparts. 2350 * 2351 * This function decodes numeric HTML entities (`A` and `A`). 2352 * It doesn't do anything with named entities like `ä`, but we don't 2353 * need them in the allowed URL protocols system anyway. 2354 * 2355 * @since 1.0.0 2356 * 2357 * @param string $content Content to change entities. 2358 * @return string Content after decoded entities. 2359 */ 2360 function wp_kses_decode_entities( $content ) { 2361 $content = preg_replace_callback( '/&#([0-9]+);/', '_wp_kses_decode_entities_chr', $content ); 2362 $content = preg_replace_callback( '/&#[Xx]([0-9A-Fa-f]+);/', '_wp_kses_decode_entities_chr_hexdec', $content ); 2363 2364 return $content; 2365 } 2366 2367 /** 2368 * Regex callback for `wp_kses_decode_entities()`. 2369 * 2370 * @since 2.9.0 2371 * @access private 2372 * @ignore 2373 * 2374 * @param array $matches preg match 2375 * @return string 2376 */ 2377 function _wp_kses_decode_entities_chr( $matches ) { 2378 return chr( $matches[1] ); 2379 } 2380 2381 /** 2382 * Regex callback for `wp_kses_decode_entities()`. 2383 * 2384 * @since 2.9.0 2385 * @access private 2386 * @ignore 2387 * 2388 * @param array $matches preg match 2389 * @return string 2390 */ 2391 function _wp_kses_decode_entities_chr_hexdec( $matches ) { 2392 return chr( hexdec( $matches[1] ) ); 2393 } 2394 2395 /** 2396 * Sanitize content with allowed HTML KSES rules. 2397 * 2398 * This function expects slashed data. 2399 * 2400 * @since 1.0.0 2401 * 2402 * @param string $data Content to filter, expected to be escaped with slashes. 2403 * @return string Filtered content. 2404 */ 2405 function wp_filter_kses( $data ) { 2406 return addslashes( wp_kses( stripslashes( $data ), current_filter() ) ); 2407 } 2408 2409 /** 2410 * Sanitize content with allowed HTML KSES rules. 2411 * 2412 * This function expects unslashed data. 2413 * 2414 * @since 2.9.0 2415 * 2416 * @param string $data Content to filter, expected to not be escaped. 2417 * @return string Filtered content. 2418 */ 2419 function wp_kses_data( $data ) { 2420 return wp_kses( $data, current_filter() ); 2421 } 2422 2423 /** 2424 * Sanitizes content for allowed HTML tags for post content. 2425 * 2426 * Post content refers to the page contents of the 'post' type and not `$_POST` 2427 * data from forms. 2428 * 2429 * This function expects slashed data. 2430 * 2431 * @since 2.0.0 2432 * 2433 * @param string $data Post content to filter, expected to be escaped with slashes. 2434 * @return string Filtered post content with allowed HTML tags and attributes intact. 2435 */ 2436 function wp_filter_post_kses( $data ) { 2437 return addslashes( wp_kses( stripslashes( $data ), 'post' ) ); 2438 } 2439 2440 /** 2441 * Sanitizes global styles user content removing unsafe rules. 2442 * 2443 * @since 5.9.0 2444 * 2445 * @param string $data Post content to filter. 2446 * @return string Filtered post content with unsafe rules removed. 2447 */ 2448 function wp_filter_global_styles_post( $data ) { 2449 $decoded_data = json_decode( wp_unslash( $data ), true ); 2450 $json_decoding_error = json_last_error(); 2451 if ( 2452 JSON_ERROR_NONE === $json_decoding_error && 2453 is_array( $decoded_data ) && 2454 isset( $decoded_data['isGlobalStylesUserThemeJSON'] ) && 2455 $decoded_data['isGlobalStylesUserThemeJSON'] 2456 ) { 2457 unset( $decoded_data['isGlobalStylesUserThemeJSON'] ); 2458 2459 $data_to_encode = WP_Theme_JSON::remove_insecure_properties( $decoded_data, 'custom' ); 2460 2461 $data_to_encode['isGlobalStylesUserThemeJSON'] = true; 2462 /** 2463 * JSON encode the data stored in post content. 2464 * Escape characters that are likely to be mangled by HTML filters: "<>&". 2465 * 2466 * This matches the escaping in {@see WP_REST_Global_Styles_Controller::prepare_item_for_database()}. 2467 */ 2468 return wp_slash( wp_json_encode( $data_to_encode, JSON_UNESCAPED_SLASHES | JSON_HEX_TAG | JSON_HEX_AMP ) ); 2469 } 2470 return $data; 2471 } 2472 2473 /** 2474 * Sanitizes content for allowed HTML tags for post content. 2475 * 2476 * Post content refers to the page contents of the 'post' type and not `$_POST` 2477 * data from forms. 2478 * 2479 * This function expects unslashed data. 2480 * 2481 * @since 2.9.0 2482 * 2483 * @param string $data Post content to filter. 2484 * @return string Filtered post content with allowed HTML tags and attributes intact. 2485 */ 2486 function wp_kses_post( $data ) { 2487 return wp_kses( $data, 'post' ); 2488 } 2489 2490 /** 2491 * Navigates through an array, object, or scalar, and sanitizes content for 2492 * allowed HTML tags for post content. 2493 * 2494 * @since 4.4.2 2495 * 2496 * @see map_deep() 2497 * 2498 * @param mixed $data The array, object, or scalar value to inspect. 2499 * @return mixed The filtered content. 2500 */ 2501 function wp_kses_post_deep( $data ) { 2502 return map_deep( $data, 'wp_kses_post' ); 2503 } 2504 2505 /** 2506 * Strips all HTML from a text string. 2507 * 2508 * This function expects slashed data. 2509 * 2510 * @since 2.1.0 2511 * 2512 * @param string $data Content to strip all HTML from. 2513 * @return string Filtered content without any HTML. 2514 */ 2515 function wp_filter_nohtml_kses( $data ) { 2516 return addslashes( wp_kses( stripslashes( $data ), 'strip' ) ); 2517 } 2518 2519 /** 2520 * Adds all KSES input form content filters. 2521 * 2522 * All hooks have default priority. The `wp_filter_kses()` function is added to 2523 * the 'pre_comment_content' and 'title_save_pre' hooks. 2524 * 2525 * The `wp_filter_post_kses()` function is added to the 'content_save_pre', 2526 * 'excerpt_save_pre', and 'content_filtered_save_pre' hooks. 2527 * 2528 * @since 2.0.0 2529 */ 2530 function kses_init_filters() { 2531 // Normal filtering. 2532 add_filter( 'title_save_pre', 'wp_filter_kses' ); 2533 2534 // Comment filtering. 2535 if ( current_user_can( 'unfiltered_html' ) ) { 2536 add_filter( 'pre_comment_content', 'wp_filter_post_kses' ); 2537 } else { 2538 add_filter( 'pre_comment_content', 'wp_filter_kses' ); 2539 } 2540 2541 // Global Styles filtering: Global Styles filters should be executed before normal post_kses HTML filters. 2542 add_filter( 'content_save_pre', 'wp_filter_global_styles_post', 9 ); 2543 add_filter( 'content_filtered_save_pre', 'wp_filter_global_styles_post', 9 ); 2544 2545 // Post filtering. 2546 add_filter( 'content_save_pre', 'wp_filter_post_kses' ); 2547 add_filter( 'excerpt_save_pre', 'wp_filter_post_kses' ); 2548 add_filter( 'content_filtered_save_pre', 'wp_filter_post_kses' ); 2549 } 2550 2551 /** 2552 * Removes all KSES input form content filters. 2553 * 2554 * A quick procedural method to removing all of the filters that KSES uses for 2555 * content in WordPress Loop. 2556 * 2557 * Does not remove the `kses_init()` function from {@see 'init'} hook (priority is 2558 * default). Also does not remove `kses_init()` function from {@see 'set_current_user'} 2559 * hook (priority is also default). 2560 * 2561 * @since 2.0.6 2562 */ 2563 function kses_remove_filters() { 2564 // Normal filtering. 2565 remove_filter( 'title_save_pre', 'wp_filter_kses' ); 2566 2567 // Comment filtering. 2568 remove_filter( 'pre_comment_content', 'wp_filter_post_kses' ); 2569 remove_filter( 'pre_comment_content', 'wp_filter_kses' ); 2570 2571 // Global Styles filtering. 2572 remove_filter( 'content_save_pre', 'wp_filter_global_styles_post', 9 ); 2573 remove_filter( 'content_filtered_save_pre', 'wp_filter_global_styles_post', 9 ); 2574 2575 // Post filtering. 2576 remove_filter( 'content_save_pre', 'wp_filter_post_kses' ); 2577 remove_filter( 'excerpt_save_pre', 'wp_filter_post_kses' ); 2578 remove_filter( 'content_filtered_save_pre', 'wp_filter_post_kses' ); 2579 } 2580 2581 /** 2582 * Sets up most of the KSES filters for input form content. 2583 * 2584 * First removes all of the KSES filters in case the current user does not need 2585 * to have KSES filter the content. If the user does not have `unfiltered_html` 2586 * capability, then KSES filters are added. 2587 * 2588 * @since 2.0.0 2589 */ 2590 function kses_init() { 2591 kses_remove_filters(); 2592 2593 if ( ! current_user_can( 'unfiltered_html' ) ) { 2594 kses_init_filters(); 2595 } 2596 } 2597 2598 /** 2599 * Filters an inline style attribute and removes disallowed rules. 2600 * 2601 * @since 2.8.1 2602 * @since 4.4.0 Added support for `min-height`, `max-height`, `min-width`, and `max-width`. 2603 * @since 4.6.0 Added support for `list-style-type`. 2604 * @since 5.0.0 Added support for `background-image`. 2605 * @since 5.1.0 Added support for `text-transform`. 2606 * @since 5.2.0 Added support for `background-position` and `grid-template-columns`. 2607 * @since 5.3.0 Added support for `grid`, `flex` and `column` layout properties. 2608 * Extended `background-*` support for individual properties. 2609 * @since 5.3.1 Added support for gradient backgrounds. 2610 * @since 5.7.1 Added support for `object-position`. 2611 * @since 5.8.0 Added support for `calc()` and `var()` values. 2612 * @since 6.1.0 Added support for `min()`, `max()`, `minmax()`, `clamp()`, 2613 * nested `var()` values, and assigning values to CSS variables. 2614 * Added support for `object-fit`, `gap`, `column-gap`, `row-gap`, and `flex-wrap`. 2615 * Extended `margin-*` and `padding-*` support for logical properties. 2616 * @since 6.2.0 Added support for `aspect-ratio`, `position`, `top`, `right`, `bottom`, `left`, 2617 * and `z-index` CSS properties. 2618 * @since 6.3.0 Extended support for `filter` to accept a URL and added support for repeat(). 2619 * Added support for `box-shadow`. 2620 * @since 6.4.0 Added support for `writing-mode`. 2621 * @since 6.5.0 Added support for `background-repeat`. 2622 * @since 6.6.0 Added support for `grid-column`, `grid-row`, and `container-type`. 2623 * @since 6.9.0 Added support for `white-space`. 2624 * @since 7.1.0 Extended gradient support to allow any single-level nested function. 2625 * Added support for transform functions, `clip-path` basic shapes, 2626 * and URLs in the SVG element reference properties. 2627 * @since 7.2.0 Added support for CSS anchor positioning properties and `text-shadow`. 2628 * 2629 * @param string $css A string of CSS rules, decoded from an HTML `style` attribute. 2630 * @param string $deprecated Not used. 2631 * @return string Filtered string of CSS rules, needing HTML escaping before sending back to a `style` attribute. 2632 */ 2633 function safecss_filter_attr( $css, $deprecated = '' ) { 2634 if ( ! empty( $deprecated ) ) { 2635 _deprecated_argument( __FUNCTION__, '2.8.1' ); // Never implemented. 2636 } 2637 2638 $css = wp_kses_no_null( $css ); 2639 $css = str_replace( array( "\n", "\r", "\t" ), '', $css ); 2640 2641 $allowed_protocols = wp_allowed_protocols(); 2642 2643 /** @todo Parse enough CSS to split rules without breaking on things like quoted strings. */ 2644 $css_array = explode( ';', trim( $css ) ); 2645 2646 /** 2647 * Filters the list of allowed CSS attributes. 2648 * 2649 * @since 2.8.1 2650 * @since 7.1.0 Added support for SVG presentation attributes. 2651 * 2652 * @param string[] $attr Array of allowed CSS attributes. 2653 */ 2654 $allowed_attr = apply_filters( 2655 'safe_style_css', 2656 array( 2657 'background', 2658 'background-color', 2659 'background-image', 2660 'background-position', 2661 'background-repeat', 2662 'background-size', 2663 'background-attachment', 2664 'background-blend-mode', 2665 2666 'border', 2667 'border-radius', 2668 'border-width', 2669 'border-color', 2670 'border-style', 2671 'border-right', 2672 'border-right-color', 2673 'border-right-style', 2674 'border-right-width', 2675 'border-bottom', 2676 'border-bottom-color', 2677 'border-bottom-left-radius', 2678 'border-bottom-right-radius', 2679 'border-bottom-style', 2680 'border-bottom-width', 2681 'border-bottom-right-radius', 2682 'border-bottom-left-radius', 2683 'border-left', 2684 'border-left-color', 2685 'border-left-style', 2686 'border-left-width', 2687 'border-top', 2688 'border-top-color', 2689 'border-top-left-radius', 2690 'border-top-right-radius', 2691 'border-top-style', 2692 'border-top-width', 2693 'border-top-left-radius', 2694 'border-top-right-radius', 2695 2696 'border-spacing', 2697 'border-collapse', 2698 'caption-side', 2699 2700 'columns', 2701 'column-count', 2702 'column-fill', 2703 'column-gap', 2704 'column-rule', 2705 'column-span', 2706 'column-width', 2707 2708 'display', 2709 2710 'color', 2711 'filter', 2712 'font', 2713 'font-family', 2714 'font-size', 2715 'font-style', 2716 'font-variant', 2717 'font-weight', 2718 'letter-spacing', 2719 'line-height', 2720 'text-align', 2721 'text-decoration', 2722 'text-indent', 2723 'text-shadow', 2724 'text-transform', 2725 'white-space', 2726 2727 'height', 2728 'min-height', 2729 'max-height', 2730 2731 'width', 2732 'min-width', 2733 'max-width', 2734 2735 'margin', 2736 'margin-right', 2737 'margin-bottom', 2738 'margin-left', 2739 'margin-top', 2740 'margin-block-start', 2741 'margin-block-end', 2742 'margin-inline-start', 2743 'margin-inline-end', 2744 2745 'padding', 2746 'padding-right', 2747 'padding-bottom', 2748 'padding-left', 2749 'padding-top', 2750 'padding-block-start', 2751 'padding-block-end', 2752 'padding-inline-start', 2753 'padding-inline-end', 2754 2755 'flex', 2756 'flex-basis', 2757 'flex-direction', 2758 'flex-flow', 2759 'flex-grow', 2760 'flex-shrink', 2761 'flex-wrap', 2762 2763 'gap', 2764 'column-gap', 2765 'row-gap', 2766 2767 'grid-template-columns', 2768 'grid-auto-columns', 2769 'grid-column-start', 2770 'grid-column-end', 2771 'grid-column', 2772 'grid-column-gap', 2773 'grid-template-rows', 2774 'grid-auto-rows', 2775 'grid-row-start', 2776 'grid-row-end', 2777 'grid-row', 2778 'grid-row-gap', 2779 'grid-gap', 2780 2781 'justify-content', 2782 'justify-items', 2783 'justify-self', 2784 'align-content', 2785 'align-items', 2786 'align-self', 2787 2788 'clear', 2789 'cursor', 2790 'direction', 2791 'float', 2792 'list-style-type', 2793 'object-fit', 2794 'object-position', 2795 'opacity', 2796 'overflow', 2797 'vertical-align', 2798 'writing-mode', 2799 2800 'position', 2801 'top', 2802 'right', 2803 'bottom', 2804 'left', 2805 'z-index', 2806 'box-shadow', 2807 'aspect-ratio', 2808 'container-type', 2809 2810 'fill', 2811 'fill-opacity', 2812 'fill-rule', 2813 2814 'stroke', 2815 'stroke-dasharray', 2816 'stroke-dashoffset', 2817 'stroke-linecap', 2818 'stroke-linejoin', 2819 'stroke-miterlimit', 2820 'stroke-opacity', 2821 'stroke-width', 2822 2823 'color-interpolation', 2824 'color-interpolation-filters', 2825 'paint-order', 2826 'stop-color', 2827 'stop-opacity', 2828 'flood-color', 2829 'flood-opacity', 2830 'lighting-color', 2831 2832 'marker', 2833 'marker-end', 2834 'marker-mid', 2835 'marker-start', 2836 2837 'clip-path', 2838 'clip-rule', 2839 'mask', 2840 'mask-type', 2841 2842 'cx', 2843 'cy', 2844 'r', 2845 'rx', 2846 'ry', 2847 'x', 2848 'y', 2849 'd', 2850 2851 'alignment-baseline', 2852 'baseline-shift', 2853 'dominant-baseline', 2854 'glyph-orientation-horizontal', 2855 'glyph-orientation-vertical', 2856 'text-anchor', 2857 'unicode-bidi', 2858 'word-spacing', 2859 2860 'font-size-adjust', 2861 'font-stretch', 2862 2863 'color-rendering', 2864 'image-rendering', 2865 'shape-rendering', 2866 'text-rendering', 2867 'vector-effect', 2868 2869 'transform', 2870 'transform-origin', 2871 2872 'pointer-events', 2873 'visibility', 2874 2875 'anchor-name', 2876 'anchor-scope', 2877 'position-anchor', 2878 'position-area', 2879 'position-try', 2880 'position-try-fallbacks', 2881 'position-try-order', 2882 'position-visibility', 2883 2884 // Custom CSS properties. 2885 '--*', 2886 ) 2887 ); 2888 2889 /* 2890 * CSS attributes that accept URL data types. 2891 * 2892 * This is in accordance to the CSS spec and unrelated to 2893 * the sub-set of supported attributes above. 2894 * 2895 * See: https://developer.mozilla.org/en-US/docs/Web/CSS/url 2896 */ 2897 $css_url_data_types = array( 2898 'background', 2899 'background-image', 2900 2901 'cursor', 2902 'filter', 2903 2904 'list-style', 2905 'list-style-image', 2906 2907 // SVG presentation properties that accept url() references. 2908 'clip-path', 2909 'fill', 2910 'marker', 2911 'marker-end', 2912 'marker-mid', 2913 'marker-start', 2914 'mask', 2915 'stroke', 2916 ); 2917 2918 /* 2919 * CSS attributes that accept gradient data types. 2920 * 2921 */ 2922 $css_gradient_data_types = array( 2923 'background', 2924 'background-image', 2925 ); 2926 2927 if ( empty( $allowed_attr ) ) { 2928 return $css; 2929 } 2930 2931 $css = ''; 2932 foreach ( $css_array as $css_item ) { 2933 if ( '' === $css_item ) { 2934 continue; 2935 } 2936 2937 $css_item = trim( $css_item ); 2938 $css_test_string = $css_item; 2939 $found = false; 2940 $url_attr = false; 2941 $gradient_attr = false; 2942 $is_custom_var = false; 2943 2944 if ( ! str_contains( $css_item, ':' ) ) { 2945 $found = true; 2946 } else { 2947 $parts = explode( ':', $css_item, 2 ); 2948 $css_selector = trim( $parts[0] ); 2949 2950 // Allow assigning values to CSS variables. 2951 if ( in_array( '--*', $allowed_attr, true ) && preg_match( '/^--[a-zA-Z0-9-_]+$/', $css_selector ) ) { 2952 $allowed_attr[] = $css_selector; 2953 $is_custom_var = true; 2954 } 2955 2956 if ( in_array( $css_selector, $allowed_attr, true ) ) { 2957 $found = true; 2958 $url_attr = in_array( $css_selector, $css_url_data_types, true ); 2959 $gradient_attr = in_array( $css_selector, $css_gradient_data_types, true ); 2960 } 2961 2962 if ( $is_custom_var ) { 2963 $css_value = trim( $parts[1] ); 2964 $url_attr = str_starts_with( $css_value, 'url(' ); 2965 $gradient_attr = str_contains( $css_value, '-gradient(' ); 2966 } 2967 } 2968 2969 if ( $found && $url_attr ) { 2970 // Simplified: matches the sequence `url(*)`. 2971 preg_match_all( '/url\([^)]+\)/', $parts[1], $url_matches ); 2972 2973 foreach ( $url_matches[0] as $url_match ) { 2974 // Clean up the URL from each of the matches above. 2975 preg_match( '/^url\(\s*([\'\"]?)(.*)(\g1)\s*\)$/', $url_match, $url_pieces ); 2976 2977 if ( empty( $url_pieces[2] ) ) { 2978 $found = false; 2979 break; 2980 } 2981 2982 $url = trim( $url_pieces[2] ); 2983 2984 if ( empty( $url ) || wp_kses_bad_protocol( $url, $allowed_protocols ) !== $url ) { 2985 $found = false; 2986 break; 2987 } else { 2988 // Remove the whole `url(*)` bit that was matched above from the CSS. 2989 $css_test_string = str_replace( $url_match, '', $css_test_string ); 2990 } 2991 } 2992 } 2993 2994 if ( $found && $gradient_attr ) { 2995 /* 2996 * Match every `*-gradient()` in the value, allowing one level of nested functions 2997 * (e.g. rgb(), hsl(), var()). Matching each occurrence, rather than requiring the 2998 * whole value to be a single gradient, lets a gradient combine with a url() image. 2999 */ 3000 preg_match_all( '/(?:repeating-)?(?:linear|radial|conic)-gradient\((?:[^()]|\([^()]*\))*\)/', $css_test_string, $gradient_matches ); 3001 3002 foreach ( $gradient_matches[0] as $gradient_match ) { 3003 // Remove each `gradient()` bit that was matched above from the CSS. 3004 $css_test_string = str_replace( $gradient_match, '', $css_test_string ); 3005 } 3006 } 3007 3008 if ( $found ) { 3009 /* 3010 * Allow CSS functions like var(), calc(), etc. by removing them from the test string. 3011 * Nested functions and parentheses are also removed, so long as the parentheses are balanced. 3012 */ 3013 $css_test_string = preg_replace( 3014 '/\b(?:' 3015 // General purpose value functions. 3016 . 'var|calc|min|max|minmax|clamp|repeat' 3017 // Transform functions. 3018 . '|matrix|matrix3d|perspective' 3019 . '|rotate|rotate3d|rotateX|rotateY|rotateZ' 3020 . '|scale|scale3d|scaleX|scaleY|scaleZ' 3021 . '|skew|skewX|skewY' 3022 . '|translate|translate3d|translateX|translateY|translateZ' 3023 // Basic shape functions, as used by `clip-path`. 3024 . '|circle|ellipse|inset|path|polygon|rect|shape|xywh' 3025 . ')(\((?:[^()]|(?1))*\))/', 3026 '', 3027 $css_test_string 3028 ); 3029 3030 // Bail if the recursive function stripping hit a PCRE error (e.g. stack/backtrack limit). 3031 if ( null === $css_test_string ) { 3032 continue; 3033 } 3034 3035 /* 3036 * Disallow CSS containing \ ( & } = or comments, except for within url(), var(), calc(), etc. 3037 * which were removed from the test string above. 3038 */ 3039 $allow_css = 0 === preg_match( '%[\\\(&=}]|/\*%', $css_test_string ); 3040 3041 /** 3042 * Filters the check for unsafe CSS in `safecss_filter_attr`. 3043 * 3044 * Enables developers to determine whether a section of CSS should be allowed or discarded. 3045 * By default, the value will be false if the part contains \ ( & } = or comments. 3046 * Return true to allow the CSS part to be included in the output. 3047 * 3048 * @since 5.5.0 3049 * 3050 * @param bool $allow_css Whether the CSS in the test string is considered safe. 3051 * @param string $css_test_string The CSS string to test. 3052 */ 3053 $allow_css = apply_filters( 'safecss_filter_attr_allow_css', $allow_css, $css_test_string ); 3054 3055 // Only add the CSS part if it passes the regex check. 3056 if ( $allow_css ) { 3057 if ( '' !== $css ) { 3058 $css .= ';'; 3059 } 3060 3061 $css .= $css_item; 3062 } 3063 } 3064 } 3065 3066 return $css; 3067 } 3068 3069 /** 3070 * Helper function to add global attributes to a tag in the allowed HTML list. 3071 * 3072 * @since 3.5.0 3073 * @since 5.0.0 Added support for `data-*` wildcard attributes. 3074 * @since 6.0.0 Added `dir`, `lang`, and `xml:lang` to global attributes. 3075 * @since 6.3.0 Added `aria-controls`, `aria-current`, and `aria-expanded` attributes. 3076 * @since 6.4.0 Added `aria-live` and `hidden` attributes. 3077 * @since 7.1.0 Added `tabindex` attribute. 3078 * 3079 * @access private 3080 * @ignore 3081 * 3082 * @param array $value An array of attributes. 3083 * @return array The array of attributes with global attributes added. 3084 */ 3085 function _wp_add_global_attributes( $value ) { 3086 $global_attributes = array( 3087 'aria-controls' => true, 3088 'aria-current' => true, 3089 'aria-describedby' => true, 3090 'aria-details' => true, 3091 'aria-expanded' => true, 3092 'aria-hidden' => true, 3093 'aria-label' => true, 3094 'aria-labelledby' => true, 3095 'aria-live' => true, 3096 'class' => true, 3097 'data-*' => true, 3098 'dir' => true, 3099 'hidden' => true, 3100 'id' => true, 3101 'lang' => true, 3102 'style' => true, 3103 'tabindex' => true, 3104 'title' => true, 3105 'role' => true, 3106 'xml:lang' => true, 3107 ); 3108 3109 if ( true === $value ) { 3110 $value = array(); 3111 } 3112 3113 if ( is_array( $value ) ) { 3114 return array_merge( $value, $global_attributes ); 3115 } 3116 3117 return $value; 3118 } 3119 3120 /** 3121 * Helper function to check if this is a safe PDF URL. 3122 * 3123 * @since 5.9.0 3124 * @access private 3125 * @ignore 3126 * 3127 * @param string $url The URL to check. 3128 * @return bool True if the URL is safe, false otherwise. 3129 */ 3130 function _wp_kses_allow_pdf_objects( $url ) { 3131 // We're not interested in URLs that contain query strings or fragments. 3132 if ( str_contains( $url, '?' ) || str_contains( $url, '#' ) ) { 3133 return false; 3134 } 3135 3136 // If it doesn't have a PDF extension, it's not safe. 3137 if ( ! str_ends_with( $url, '.pdf' ) ) { 3138 return false; 3139 } 3140 3141 // If the URL host matches the current site's media URL, it's safe. 3142 $upload_info = wp_upload_dir( null, false ); 3143 $parsed_url = wp_parse_url( $upload_info['url'] ); 3144 $upload_host = $parsed_url['host'] ?? ''; 3145 $upload_port = isset( $parsed_url['port'] ) ? ':' . $parsed_url['port'] : ''; 3146 3147 if ( str_starts_with( $url, "http://$upload_host$upload_port/" ) 3148 || str_starts_with( $url, "https://$upload_host$upload_port/" ) 3149 ) { 3150 return true; 3151 } 3152 3153 return false; 3154 }
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| Generated : Tue Oct 6 08:20:33 2026 | Cross-referenced by PHPXref |