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1 <?php 2 3 // Added wp_ prefix to avoid conflicts with existing kses users 4 # kses 0.2.2 - HTML/XHTML filter that only allows some elements and attributes 5 # Copyright (C) 2002, 2003, 2005 Ulf Harnhammar 6 # *** CONTACT INFORMATION *** 7 # 8 # E-mail: metaur at users dot sourceforge dot net 9 # Web page: http://sourceforge.net/projects/kses 10 # Paper mail: Ulf Harnhammar 11 # Ymergatan 17 C 12 # 753 25 Uppsala 13 # SWEDEN 14 # 15 # [kses strips evil scripts!] 16 if (!defined('CUSTOM_TAGS')) 17 define('CUSTOM_TAGS', false); 18 19 // You can override this in your my-hacks.php file 20 if (!CUSTOM_TAGS) { 21 $allowedposttags = array ('address' => array (), 'a' => array ('href' => array (), 'title' => array (), 'rel' => array (), 'rev' => array (), 'name' => array ()), 'abbr' => array ('title' => array ()), 'acronym' => array ('title' => array ()), 'b' => array (), 'big' => array (), 'blockquote' => array ('cite' => array ()), 'br' => array (), 'button' => array ('disabled' => array (), 'name' => array (), 'type' => array (), 'value' => array ()), 'caption' => array ('align' => array ()), 'code' => array (), 'col' => array ('align' => array (), 'char' => array (), 'charoff' => array (), 'span' => array (), 'valign' => array (), 'width' => array ()), 'del' => array ('datetime' => array ()), 'dd' => array (), 'div' => array ('align' => array ()), 'dl' => array (), 'dt' => array (), 'em' => array (), 'fieldset' => array (), 'font' => array ('color' => array (), 'face' => array (), 'size' => array ()), 'form' => array ('action' => array (), 'accept' => array (), 'accept-charset' => array (), 'enctype' => array (), 'method' => array (), 'name' => array (), 'target' => array ()), 'h1' => array ('align' => array ()), 'h2' => array ('align' => array ()), 'h3' => array ('align' => array ()), 'h4' => array ('align' => array ()), 'h5' => array ('align' => array ()), 'h6' => array ('align' => array ()), 'hr' => array ('align' => array (), 'noshade' => array (), 'size' => array (), 'width' => array ()), 'i' => array (), 'img' => array ('alt' => array (), 'align' => array (), 'border' => array (), 'height' => array (), 'hspace' => array (), 'longdesc' => array (), 'vspace' => array (), 'src' => array (), 'width' => array ()), 'ins' => array ('datetime' => array (), 'cite' => array ()), 'kbd' => array (), 'label' => array ('for' => array ()), 'legend' => array ('align' => array ()), 'li' => array (), 'p' => array ('align' => array ()), 'pre' => array ('width' => array ()), 'q' => array ('cite' => array ()), 's' => array (), 'strike' => array (), 'strong' => array (), 'sub' => array (), 'sup' => array (), 'table' => array ('align' => array (), 'bgcolor' => array (), 'border' => array (), 'cellpadding' => array (), 'cellspacing' => array (), 'rules' => array (), 'summary' => array (), 'width' => array ()), 'tbody' => array ('align' => array (), 'char' => array (), 'charoff' => array (), 'valign' => array ()), 'td' => array ('abbr' => array (), 'align' => array (), 'axis' => array (), 'bgcolor' => array (), 'char' => array (), 'charoff' => array (), 'colspan' => array (), 'headers' => array (), 'height' => array (), 'nowrap' => array (), 'rowspan' => array (), 'scope' => array (), 'valign' => array (), 'width' => array ()), 'textarea' => array ('cols' => array (), 'rows' => array (), 'disabled' => array (), 'name' => array (), 'readonly' => array ()), 'tfoot' => array ('align' => array (), 'char' => array (), 'charoff' => array (), 'valign' => array ()), 'th' => array ('abbr' => array (), 'align' => array (), 'axis' => array (), 'bgcolor' => array (), 'char' => array (), 'charoff' => array (), 'colspan' => array (), 'headers' => array (), 'height' => array (), 'nowrap' => array (), 'rowspan' => array (), 'scope' => array (), 'valign' => array (), 'width' => array ()), 'thead' => array ('align' => array (), 'char' => array (), 'charoff' => array (), 'valign' => array ()), 'title' => array (), 'tr' => array ('align' => array (), 'bgcolor' => array (), 'char' => array (), 'charoff' => array (), 'valign' => array ()), 'tt' => array (), 'u' => array (), 'ul' => array (), 'ol' => array (), 'var' => array () ); 22 $allowedtags = array ('a' => array ('href' => array (), 'title' => array ()), 'abbr' => array ('title' => array ()), 'acronym' => array ('title' => array ()), 'b' => array (), 'blockquote' => array ('cite' => array ()), 23 // 'br' => array(), 24 'code' => array (), 25 // 'del' => array('datetime' => array()), 26 // 'dd' => array(), 27 // 'dl' => array(), 28 // 'dt' => array(), 29 'em' => array (), 'i' => array (), 30 // 'ins' => array('datetime' => array(), 'cite' => array()), 31 // 'li' => array(), 32 // 'ol' => array(), 33 // 'p' => array(), 34 // 'q' => array(), 35 'strike' => array (), 'strong' => array (), 36 // 'sub' => array(), 37 // 'sup' => array(), 38 // 'u' => array(), 39 // 'ul' => array(), 40 ); 41 } 42 function wp_kses($string, $allowed_html, $allowed_protocols = array ('http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet')) 43 ############################################################################### 44 # This function makes sure that only the allowed HTML element names, attribute 45 # names and attribute values plus only sane HTML entities will occur in 46 # $string. You have to remove any slashes from PHP's magic quotes before you 47 # call this function. 48 ############################################################################### 49 { 50 $string = wp_kses_no_null($string); 51 $string = wp_kses_js_entities($string); 52 $string = wp_kses_normalize_entities($string); 53 $string = wp_kses_hook($string); 54 $allowed_html_fixed = wp_kses_array_lc($allowed_html); 55 return wp_kses_split($string, $allowed_html_fixed, $allowed_protocols); 56 } # function wp_kses 57 58 function wp_kses_hook($string) 59 ############################################################################### 60 # You add any kses hooks here. 61 ############################################################################### 62 { 63 return $string; 64 } # function wp_kses_hook 65 66 function wp_kses_version() 67 ############################################################################### 68 # This function returns kses' version number. 69 ############################################################################### 70 { 71 return '0.2.2'; 72 } # function wp_kses_version 73 74 function wp_kses_split($string, $allowed_html, $allowed_protocols) 75 ############################################################################### 76 # This function searches for HTML tags, no matter how malformed. It also 77 # matches stray ">" characters. 78 ############################################################################### 79 { 80 return preg_replace('%((<!--.*?(-->|$))|(<[^>]*(>|$)|>))%e', 81 "wp_kses_split2('\\1', \$allowed_html, ".'$allowed_protocols)', $string); 82 } # function wp_kses_split 83 84 function wp_kses_split2($string, $allowed_html, $allowed_protocols) 85 ############################################################################### 86 # This function does a lot of work. It rejects some very malformed things 87 # like <:::>. It returns an empty string, if the element isn't allowed (look 88 # ma, no strip_tags()!). Otherwise it splits the tag into an element and an 89 # attribute list. 90 ############################################################################### 91 { 92 $string = wp_kses_stripslashes($string); 93 94 if (substr($string, 0, 1) != '<') 95 return '>'; 96 # It matched a ">" character 97 98 if (preg_match('%^<!--(.*?)(-->)?$%', $string, $matches)) { 99 $string = str_replace(array('<!--', '-->'), '', $matches[1]); 100 while ( $string != $newstring = wp_kses($string, $allowed_html, $allowed_protocols) ) 101 $string = $newstring; 102 if ( $string == '' ) 103 return ''; 104 return "<!--{$string}-->"; 105 } 106 # Allow HTML comments 107 108 if (!preg_match('%^<\s*(/\s*)?([a-zA-Z0-9]+)([^>]*)>?$%', $string, $matches)) 109 return ''; 110 # It's seriously malformed 111 112 $slash = trim($matches[1]); 113 $elem = $matches[2]; 114 $attrlist = $matches[3]; 115 116 if (!@isset($allowed_html[strtolower($elem)])) 117 return ''; 118 # They are using a not allowed HTML element 119 120 if ($slash != '') 121 return "<$slash$elem>"; 122 # No attributes are allowed for closing elements 123 124 return wp_kses_attr("$slash$elem", $attrlist, $allowed_html, $allowed_protocols); 125 } # function wp_kses_split2 126 127 function wp_kses_attr($element, $attr, $allowed_html, $allowed_protocols) 128 ############################################################################### 129 # This function removes all attributes, if none are allowed for this element. 130 # If some are allowed it calls wp_kses_hair() to split them further, and then it 131 # builds up new HTML code from the data that kses_hair() returns. It also 132 # removes "<" and ">" characters, if there are any left. One more thing it 133 # does is to check if the tag has a closing XHTML slash, and if it does, 134 # it puts one in the returned code as well. 135 ############################################################################### 136 { 137 # Is there a closing XHTML slash at the end of the attributes? 138 139 $xhtml_slash = ''; 140 if (preg_match('%\s/\s*$%', $attr)) 141 $xhtml_slash = ' /'; 142 143 # Are any attributes allowed at all for this element? 144 145 if (@ count($allowed_html[strtolower($element)]) == 0) 146 return "<$element$xhtml_slash>"; 147 148 # Split it 149 150 $attrarr = wp_kses_hair($attr, $allowed_protocols); 151 152 # Go through $attrarr, and save the allowed attributes for this element 153 # in $attr2 154 155 $attr2 = ''; 156 157 foreach ($attrarr as $arreach) { 158 if (!@ isset ($allowed_html[strtolower($element)][strtolower($arreach['name'])])) 159 continue; # the attribute is not allowed 160 161 $current = $allowed_html[strtolower($element)][strtolower($arreach['name'])]; 162 if ($current == '') 163 continue; # the attribute is not allowed 164 165 if (!is_array($current)) 166 $attr2 .= ' '.$arreach['whole']; 167 # there are no checks 168 169 else { 170 # there are some checks 171 $ok = true; 172 foreach ($current as $currkey => $currval) 173 if (!wp_kses_check_attr_val($arreach['value'], $arreach['vless'], $currkey, $currval)) { 174 $ok = false; 175 break; 176 } 177 178 if ($ok) 179 $attr2 .= ' '.$arreach['whole']; # it passed them 180 } # if !is_array($current) 181 } # foreach 182 183 # Remove any "<" or ">" characters 184 185 $attr2 = preg_replace('/[<>]/', '', $attr2); 186 187 return "<$element$attr2$xhtml_slash>"; 188 } # function wp_kses_attr 189 190 function wp_kses_hair($attr, $allowed_protocols) 191 ############################################################################### 192 # This function does a lot of work. It parses an attribute list into an array 193 # with attribute data, and tries to do the right thing even if it gets weird 194 # input. It will add quotes around attribute values that don't have any quotes 195 # or apostrophes around them, to make it easier to produce HTML code that will 196 # conform to W3C's HTML specification. It will also remove bad URL protocols 197 # from attribute values. 198 ############################################################################### 199 { 200 $attrarr = array (); 201 $mode = 0; 202 $attrname = ''; 203 204 # Loop through the whole attribute list 205 206 while (strlen($attr) != 0) { 207 $working = 0; # Was the last operation successful? 208 209 switch ($mode) { 210 case 0 : # attribute name, href for instance 211 212 if (preg_match('/^([-a-zA-Z]+)/', $attr, $match)) { 213 $attrname = $match[1]; 214 $working = $mode = 1; 215 $attr = preg_replace('/^[-a-zA-Z]+/', '', $attr); 216 } 217 218 break; 219 220 case 1 : # equals sign or valueless ("selected") 221 222 if (preg_match('/^\s*=\s*/', $attr)) # equals sign 223 { 224 $working = 1; 225 $mode = 2; 226 $attr = preg_replace('/^\s*=\s*/', '', $attr); 227 break; 228 } 229 230 if (preg_match('/^\s+/', $attr)) # valueless 231 { 232 $working = 1; 233 $mode = 0; 234 $attrarr[] = array ('name' => $attrname, 'value' => '', 'whole' => $attrname, 'vless' => 'y'); 235 $attr = preg_replace('/^\s+/', '', $attr); 236 } 237 238 break; 239 240 case 2 : # attribute value, a URL after href= for instance 241 242 if (preg_match('/^"([^"]*)"(\s+|$)/', $attr, $match)) 243 # "value" 244 { 245 $thisval = wp_kses_bad_protocol($match[1], $allowed_protocols); 246 247 $attrarr[] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname=\"$thisval\"", 'vless' => 'n'); 248 $working = 1; 249 $mode = 0; 250 $attr = preg_replace('/^"[^"]*"(\s+|$)/', '', $attr); 251 break; 252 } 253 254 if (preg_match("/^'([^']*)'(\s+|$)/", $attr, $match)) 255 # 'value' 256 { 257 $thisval = wp_kses_bad_protocol($match[1], $allowed_protocols); 258 259 $attrarr[] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname='$thisval'", 'vless' => 'n'); 260 $working = 1; 261 $mode = 0; 262 $attr = preg_replace("/^'[^']*'(\s+|$)/", '', $attr); 263 break; 264 } 265 266 if (preg_match("%^([^\s\"']+)(\s+|$)%", $attr, $match)) 267 # value 268 { 269 $thisval = wp_kses_bad_protocol($match[1], $allowed_protocols); 270 271 $attrarr[] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname=\"$thisval\"", 'vless' => 'n'); 272 # We add quotes to conform to W3C's HTML spec. 273 $working = 1; 274 $mode = 0; 275 $attr = preg_replace("%^[^\s\"']+(\s+|$)%", '', $attr); 276 } 277 278 break; 279 } # switch 280 281 if ($working == 0) # not well formed, remove and try again 282 { 283 $attr = wp_kses_html_error($attr); 284 $mode = 0; 285 } 286 } # while 287 288 if ($mode == 1) 289 # special case, for when the attribute list ends with a valueless 290 # attribute like "selected" 291 $attrarr[] = array ('name' => $attrname, 'value' => '', 'whole' => $attrname, 'vless' => 'y'); 292 293 return $attrarr; 294 } # function wp_kses_hair 295 296 function wp_kses_check_attr_val($value, $vless, $checkname, $checkvalue) 297 ############################################################################### 298 # This function performs different checks for attribute values. The currently 299 # implemented checks are "maxlen", "minlen", "maxval", "minval" and "valueless" 300 # with even more checks to come soon. 301 ############################################################################### 302 { 303 $ok = true; 304 305 switch (strtolower($checkname)) { 306 case 'maxlen' : 307 # The maxlen check makes sure that the attribute value has a length not 308 # greater than the given value. This can be used to avoid Buffer Overflows 309 # in WWW clients and various Internet servers. 310 311 if (strlen($value) > $checkvalue) 312 $ok = false; 313 break; 314 315 case 'minlen' : 316 # The minlen check makes sure that the attribute value has a length not 317 # smaller than the given value. 318 319 if (strlen($value) < $checkvalue) 320 $ok = false; 321 break; 322 323 case 'maxval' : 324 # The maxval check does two things: it checks that the attribute value is 325 # an integer from 0 and up, without an excessive amount of zeroes or 326 # whitespace (to avoid Buffer Overflows). It also checks that the attribute 327 # value is not greater than the given value. 328 # This check can be used to avoid Denial of Service attacks. 329 330 if (!preg_match('/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value)) 331 $ok = false; 332 if ($value > $checkvalue) 333 $ok = false; 334 break; 335 336 case 'minval' : 337 # The minval check checks that the attribute value is a positive integer, 338 # and that it is not smaller than the given value. 339 340 if (!preg_match('/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value)) 341 $ok = false; 342 if ($value < $checkvalue) 343 $ok = false; 344 break; 345 346 case 'valueless' : 347 # The valueless check checks if the attribute has a value 348 # (like <a href="blah">) or not (<option selected>). If the given value 349 # is a "y" or a "Y", the attribute must not have a value. 350 # If the given value is an "n" or an "N", the attribute must have one. 351 352 if (strtolower($checkvalue) != $vless) 353 $ok = false; 354 break; 355 } # switch 356 357 return $ok; 358 } # function wp_kses_check_attr_val 359 360 function wp_kses_bad_protocol($string, $allowed_protocols) 361 ############################################################################### 362 # This function removes all non-allowed protocols from the beginning of 363 # $string. It ignores whitespace and the case of the letters, and it does 364 # understand HTML entities. It does its work in a while loop, so it won't be 365 # fooled by a string like "javascript:javascript:alert(57)". 366 ############################################################################### 367 { 368 $string = wp_kses_no_null($string); 369 $string = preg_replace('/\xad+/', '', $string); # deals with Opera "feature" 370 $string2 = $string.'a'; 371 372 while ($string != $string2) { 373 $string2 = $string; 374 $string = wp_kses_bad_protocol_once($string, $allowed_protocols); 375 } # while 376 377 return $string; 378 } # function wp_kses_bad_protocol 379 380 function wp_kses_no_null($string) 381 ############################################################################### 382 # This function removes any NULL characters in $string. 383 ############################################################################### 384 { 385 $string = preg_replace('/\0+/', '', $string); 386 $string = preg_replace('/(\\\\0)+/', '', $string); 387 388 return $string; 389 } # function wp_kses_no_null 390 391 function wp_kses_stripslashes($string) 392 ############################################################################### 393 # This function changes the character sequence \" to just " 394 # It leaves all other slashes alone. It's really weird, but the quoting from 395 # preg_replace(//e) seems to require this. 396 ############################################################################### 397 { 398 return preg_replace('%\\\\"%', '"', $string); 399 } # function wp_kses_stripslashes 400 401 function wp_kses_array_lc($inarray) 402 ############################################################################### 403 # This function goes through an array, and changes the keys to all lower case. 404 ############################################################################### 405 { 406 $outarray = array (); 407 408 foreach ($inarray as $inkey => $inval) { 409 $outkey = strtolower($inkey); 410 $outarray[$outkey] = array (); 411 412 foreach ($inval as $inkey2 => $inval2) { 413 $outkey2 = strtolower($inkey2); 414 $outarray[$outkey][$outkey2] = $inval2; 415 } # foreach $inval 416 } # foreach $inarray 417 418 return $outarray; 419 } # function wp_kses_array_lc 420 421 function wp_kses_js_entities($string) 422 ############################################################################### 423 # This function removes the HTML JavaScript entities found in early versions of 424 # Netscape 4. 425 ############################################################################### 426 { 427 return preg_replace('%&\s*\{[^}]*(\}\s*;?|$)%', '', $string); 428 } # function wp_kses_js_entities 429 430 function wp_kses_html_error($string) 431 ############################################################################### 432 # This function deals with parsing errors in wp_kses_hair(). The general plan is 433 # to remove everything to and including some whitespace, but it deals with 434 # quotes and apostrophes as well. 435 ############################################################################### 436 { 437 return preg_replace('/^("[^"]*("|$)|\'[^\']*(\'|$)|\S)*\s*/', '', $string); 438 } # function wp_kses_html_error 439 440 function wp_kses_bad_protocol_once($string, $allowed_protocols) 441 ############################################################################### 442 # This function searches for URL protocols at the beginning of $string, while 443 # handling whitespace and HTML entities. 444 ############################################################################### 445 { 446 return preg_replace('/^((&[^;]*;|[\sA-Za-z0-9])*)'.'(:|:|&#[Xx]3[Aa];)\s*/e', 'wp_kses_bad_protocol_once2("\\1", $allowed_protocols)', $string); 447 } # function wp_kses_bad_protocol_once 448 449 function wp_kses_bad_protocol_once2($string, $allowed_protocols) 450 ############################################################################### 451 # This function processes URL protocols, checks to see if they're in the white- 452 # list or not, and returns different data depending on the answer. 453 ############################################################################### 454 { 455 $string2 = wp_kses_decode_entities($string); 456 $string2 = preg_replace('/\s/', '', $string2); 457 $string2 = wp_kses_no_null($string2); 458 $string2 = preg_replace('/\xad+/', '', $string2); 459 # deals with Opera "feature" 460 $string2 = strtolower($string2); 461 462 $allowed = false; 463 foreach ($allowed_protocols as $one_protocol) 464 if (strtolower($one_protocol) == $string2) { 465 $allowed = true; 466 break; 467 } 468 469 if ($allowed) 470 return "$string2:"; 471 else 472 return ''; 473 } # function wp_kses_bad_protocol_once2 474 475 function wp_kses_normalize_entities($string) 476 ############################################################################### 477 # This function normalizes HTML entities. It will convert "AT&T" to the correct 478 # "AT&T", ":" to ":", "&#XYZZY;" to "&#XYZZY;" and so on. 479 ############################################################################### 480 { 481 # Disarm all entities by converting & to & 482 483 $string = str_replace('&', '&', $string); 484 485 # Change back the allowed entities in our entity whitelist 486 487 $string = preg_replace('/&([A-Za-z][A-Za-z0-9]{0,19});/', '&\\1;', $string); 488 $string = preg_replace('/&#0*([0-9]{1,5});/e', 'wp_kses_normalize_entities2("\\1")', $string); 489 $string = preg_replace('/&#([Xx])0*(([0-9A-Fa-f]{2}){1,2});/', '&#\\1\\2;', $string); 490 491 return $string; 492 } # function wp_kses_normalize_entities 493 494 function wp_kses_normalize_entities2($i) 495 ############################################################################### 496 # This function helps wp_kses_normalize_entities() to only accept 16 bit values 497 # and nothing more for &#number; entities. 498 ############################################################################### 499 { 500 return (($i > 65535) ? "&#$i;" : "&#$i;"); 501 } # function wp_kses_normalize_entities2 502 503 function wp_kses_decode_entities($string) 504 ############################################################################### 505 # This function decodes numeric HTML entities (A and A). It doesn't 506 # do anything with other entities like ä, but we don't need them in the 507 # URL protocol whitelisting system anyway. 508 ############################################################################### 509 { 510 $string = preg_replace('/&#([0-9]+);/e', 'chr("\\1")', $string); 511 $string = preg_replace('/&#[Xx]([0-9A-Fa-f]+);/e', 'chr(hexdec("\\1"))', $string); 512 513 return $string; 514 } # function wp_kses_decode_entities 515 516 function wp_filter_kses($data) { 517 global $allowedtags; 518 return addslashes( wp_kses(stripslashes( $data ), $allowedtags) ); 519 } 520 521 function wp_filter_post_kses($data) { 522 global $allowedposttags; 523 return addslashes ( wp_kses(stripslashes( $data ), $allowedposttags) ); 524 } 525 526 function wp_filter_nohtml_kses($data) { 527 return addslashes ( wp_kses(stripslashes( $data ), array()) ); 528 } 529 530 function kses_init_filters() { 531 // Normal filtering. 532 add_filter('pre_comment_content', 'wp_filter_kses'); 533 add_filter('title_save_pre', 'wp_filter_kses'); 534 535 // Post filtering 536 add_filter('content_save_pre', 'wp_filter_post_kses'); 537 add_filter('excerpt_save_pre', 'wp_filter_post_kses'); 538 add_filter('content_filtered_save_pre', 'wp_filter_post_kses'); 539 } 540 541 function kses_remove_filters() { 542 // Normal filtering. 543 remove_filter('pre_comment_content', 'wp_filter_kses'); 544 remove_filter('title_save_pre', 'wp_filter_kses'); 545 546 // Post filtering 547 remove_filter('content_save_pre', 'wp_filter_post_kses'); 548 remove_filter('excerpt_save_pre', 'wp_filter_post_kses'); 549 remove_filter('content_filtered_save_pre', 'wp_filter_post_kses'); 550 } 551 552 function kses_init() { 553 kses_remove_filters(); 554 555 if (current_user_can('unfiltered_html') == false) 556 kses_init_filters(); 557 } 558 559 add_action('init', 'kses_init'); 560 add_action('set_current_user', 'kses_init'); 561 ?>
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| Généré le : Fri Mar 30 19:41:27 2007 | par Balluche grâce à PHPXref 0.7 |