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update to Version 4.1.1:HTML Purifier 4.1.1 is a major security and bugfix release that
improves on 4.1s fix for an XSS vulnerability exploitable on Internet Explorer. It also contains a number of important bugfixes, including the removal of improper logic that could result in infinite loops and fixed parsing for single-attributes with entities with DirectLex.
This commit is contained in:
Klaus Leithoff
parent
4b67a05074
commit
0ec0d04fb3
@ -9,6 +9,21 @@ NEWS ( CHANGELOG and HISTORY ) HTMLPurifier
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. Internal change
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==========================
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4.1.1, released 2010-05-31
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- Fix undefined index warnings in maintenance scripts.
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- Fix bug in DirectLex for parsing elements with a single attribute
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with entities.
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- Rewrite CSS output logic for font-family and url(). Thanks Mario
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Heiderich <mario.heiderich@googlemail.com> for reporting and Takeshi
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Terada <t-terada@violet.plala.or.jp> for suggesting the fix.
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- Emit an error for CollectErrors if a body is extracted
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- Fix bug where in background-position for center keyword handling.
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- Fix infinite loop when a wrapper element is inserted in a context
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where it's not allowed. Thanks Lars <lars@renoz.dk> for reporting.
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- Remove +x bit and shebang from index.php; only supported mode is to
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explicitly call it with php.
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- Make test script less chatty when log_errors is on.
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4.1.0, released 2010-04-26
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! Support proprietary height attribute on table element
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! Support YouTube slideshows that contain /cp/ in their URL.
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@ -7,7 +7,7 @@
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* primary concern and you are using an opcode cache. PLEASE DO NOT EDIT THIS
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* FILE, changes will be overwritten the next time the script is run.
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*
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* @version 4.1.0
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* @version 4.1.1
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*
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* @warning
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* You must *not* include any other HTML Purifier files before this file,
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@ -19,7 +19,7 @@
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*/
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/*
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HTML Purifier 4.1.0 - Standards Compliant HTML Filtering
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HTML Purifier 4.1.1 - Standards Compliant HTML Filtering
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Copyright (C) 2006-2008 Edward Z. Yang
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This library is free software; you can redistribute it and/or
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@ -55,10 +55,10 @@ class HTMLPurifier
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{
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/** Version of HTML Purifier */
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public $version = '4.1.0';
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public $version = '4.1.1';
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/** Constant with version of HTML Purifier */
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const VERSION = '4.1.0';
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const VERSION = '4.1.1';
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/** Global configuration object */
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public $config;
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@ -82,6 +82,42 @@ abstract class HTMLPurifier_AttrDef
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return preg_replace('/rgb\((\d+)\s*,\s*(\d+)\s*,\s*(\d+)\)/', 'rgb(\1,\2,\3)', $string);
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}
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/**
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* Parses a possibly escaped CSS string and returns the "pure"
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* version of it.
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*/
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protected function expandCSSEscape($string) {
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// flexibly parse it
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$ret = '';
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for ($i = 0, $c = strlen($string); $i < $c; $i++) {
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if ($string[$i] === '\\') {
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$i++;
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if ($i >= $c) {
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$ret .= '\\';
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break;
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}
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if (ctype_xdigit($string[$i])) {
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$code = $string[$i];
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for ($a = 1, $i++; $i < $c && $a < 6; $i++, $a++) {
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if (!ctype_xdigit($string[$i])) break;
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$code .= $string[$i];
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}
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// We have to be extremely careful when adding
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// new characters, to make sure we're not breaking
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// the encoding.
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$char = HTMLPurifier_Encoder::unichr(hexdec($code));
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if (HTMLPurifier_Encoder::cleanUTF8($char) === '') continue;
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$ret .= $char;
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if ($i < $c && trim($string[$i]) !== '') $i--;
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continue;
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}
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if ($string[$i] === "\n") continue;
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}
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$ret .= $string[$i];
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}
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return $ret;
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}
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}
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// vim: et sw=4 sts=4
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@ -59,7 +59,8 @@ class HTMLPurifier_AttrDef_CSS_BackgroundPosition extends HTMLPurifier_AttrDef
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$keywords = array();
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$keywords['h'] = false; // left, right
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$keywords['v'] = false; // top, bottom
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$keywords['c'] = false; // center
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$keywords['ch'] = false; // center (first word)
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$keywords['cv'] = false; // center (second word)
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$measures = array();
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$i = 0;
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@ -79,6 +80,13 @@ class HTMLPurifier_AttrDef_CSS_BackgroundPosition extends HTMLPurifier_AttrDef
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$lbit = ctype_lower($bit) ? $bit : strtolower($bit);
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if (isset($lookup[$lbit])) {
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$status = $lookup[$lbit];
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if ($status == 'c') {
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if ($i == 0) {
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$status = 'ch';
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} else {
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$status = 'cv';
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}
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}
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$keywords[$status] = $lbit;
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$i++;
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}
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@ -101,20 +109,19 @@ class HTMLPurifier_AttrDef_CSS_BackgroundPosition extends HTMLPurifier_AttrDef
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if (!$i) return false; // no valid values were caught
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$ret = array();
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// first keyword
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if ($keywords['h']) $ret[] = $keywords['h'];
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elseif (count($measures)) $ret[] = array_shift($measures);
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elseif ($keywords['c']) {
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$ret[] = $keywords['c'];
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$keywords['c'] = false; // prevent re-use: center = center center
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elseif ($keywords['ch']) {
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$ret[] = $keywords['ch'];
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$keywords['cv'] = false; // prevent re-use: center = center center
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}
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elseif (count($measures)) $ret[] = array_shift($measures);
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if ($keywords['v']) $ret[] = $keywords['v'];
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elseif ($keywords['cv']) $ret[] = $keywords['cv'];
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elseif (count($measures)) $ret[] = array_shift($measures);
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elseif ($keywords['c']) $ret[] = $keywords['c'];
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if (empty($ret)) return false;
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return implode(' ', $ret);
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@ -34,37 +34,10 @@ class HTMLPurifier_AttrDef_CSS_FontFamily extends HTMLPurifier_AttrDef
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$quote = $font[0];
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if ($font[$length - 1] !== $quote) continue;
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$font = substr($font, 1, $length - 2);
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$new_font = '';
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for ($i = 0, $c = strlen($font); $i < $c; $i++) {
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if ($font[$i] === '\\') {
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$i++;
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if ($i >= $c) {
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$new_font .= '\\';
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break;
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}
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if (ctype_xdigit($font[$i])) {
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$code = $font[$i];
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for ($a = 1, $i++; $i < $c && $a < 6; $i++, $a++) {
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if (!ctype_xdigit($font[$i])) break;
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$code .= $font[$i];
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}
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// We have to be extremely careful when adding
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// new characters, to make sure we're not breaking
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// the encoding.
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$char = HTMLPurifier_Encoder::unichr(hexdec($code));
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if (HTMLPurifier_Encoder::cleanUTF8($char) === '') continue;
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$new_font .= $char;
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if ($i < $c && trim($font[$i]) !== '') $i--;
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continue;
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}
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if ($font[$i] === "\n") continue;
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}
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$new_font .= $font[$i];
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}
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$font = $new_font;
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}
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$font = $this->expandCSSEscape($font);
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// $font is a pure representation of the font name
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if (ctype_alnum($font) && $font !== '') {
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@ -73,12 +46,21 @@ class HTMLPurifier_AttrDef_CSS_FontFamily extends HTMLPurifier_AttrDef
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continue;
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}
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// complicated font, requires quoting
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// bugger out on whitespace. form feed (0C) really
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// shouldn't show up regardless
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$font = str_replace(array("\n", "\t", "\r", "\x0C"), ' ', $font);
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// armor single quotes and new lines
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$font = str_replace("\\", "\\\\", $font);
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$font = str_replace("'", "\\'", $font);
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$final .= "'$font', ";
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// These ugly transforms don't pose a security
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// risk (as \\ and \" might). We could try to be clever and
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// use single-quote wrapping when there is a double quote
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// present, but I have choosen not to implement that.
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// (warning: this code relies on the selection of quotation
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// mark below)
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$font = str_replace('\\', '\\5C ', $font);
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$font = str_replace('"', '\\22 ', $font);
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// complicated font, requires quoting
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$final .= "\"$font\", "; // note that this will later get turned into "
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}
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$final = rtrim($final, ', ');
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if ($final === '') return false;
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@ -34,20 +34,16 @@ class HTMLPurifier_AttrDef_CSS_URI extends HTMLPurifier_AttrDef_URI
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$uri = substr($uri, 1, $new_length - 1);
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}
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$keys = array( '(', ')', ',', ' ', '"', "'");
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$values = array('\\(', '\\)', '\\,', '\\ ', '\\"', "\\'");
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$uri = str_replace($values, $keys, $uri);
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$uri = $this->expandCSSEscape($uri);
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$result = parent::validate($uri, $config, $context);
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if ($result === false) return false;
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// escape necessary characters according to CSS spec
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// except for the comma, none of these should appear in the
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// URI at all
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$result = str_replace($keys, $values, $result);
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// extra sanity check; should have been done by URI
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$result = str_replace(array('"', "\\", "\n", "\x0c", "\r"), "", $result);
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return "url('$result')";
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return "url(\"$result\")";
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}
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@ -20,7 +20,7 @@ class HTMLPurifier_Config
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/**
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* HTML Purifier's version
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*/
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public $version = '4.1.0';
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public $version = '4.1.1';
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/**
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* Bool indicator whether or not to automatically finalize
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@ -23,6 +23,7 @@ $messages = array(
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'Lexer: Missing gt' => 'Missing greater-than sign (>), previous less-than sign (<) should be escaped',
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'Lexer: Missing attribute key' => 'Attribute declaration has no key',
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'Lexer: Missing end quote' => 'Attribute declaration has no end quote',
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'Lexer: Extracted body' => 'Removed document metadata tags',
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'Strategy_RemoveForeignElements: Tag transform' => '<$1> element transformed into $CurrentToken.Serialized',
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'Strategy_RemoveForeignElements: Missing required attribute' => '$CurrentToken.Compact element missing required attribute $1',
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@ -265,7 +265,15 @@ class HTMLPurifier_Lexer
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// extract body from document if applicable
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if ($config->get('Core.ConvertDocumentToFragment')) {
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$html = $this->extractBody($html);
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$e = false;
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if ($config->get('Core.CollectErrors')) {
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$e =& $context->get('ErrorCollector');
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}
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$new_html = $this->extractBody($html);
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if ($e && $new_html != $html) {
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$e->send(E_WARNING, 'Lexer: Extracted body');
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}
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$html = $new_html;
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}
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// expand entities that aren't the big five
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@ -384,7 +384,7 @@ class HTMLPurifier_Lexer_DirectLex extends HTMLPurifier_Lexer
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}
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}
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if ($value === false) $value = '';
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return array($key => $value);
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return array($key => $this->parseData($value));
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}
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// setup loop environment
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@ -165,6 +165,7 @@ class HTMLPurifier_Strategy_MakeWellFormed extends HTMLPurifier_Strategy
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$token = $tokens[$t];
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//echo '<br>'; printTokens($tokens, $t); printTokens($this->stack);
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//flush();
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// quick-check: if it's not a tag, no need to process
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if (empty($token->is_tag)) {
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@ -221,11 +222,14 @@ class HTMLPurifier_Strategy_MakeWellFormed extends HTMLPurifier_Strategy
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}
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if ($autoclose && $definition->info[$token->name]->wrap) {
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// check if this is actually a wrap (mmm wraps!)
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// Check if an element can be wrapped by another
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// element to make it valid in a context (for
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// example, <ul><ul> needs a <li> in between)
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$wrapname = $definition->info[$token->name]->wrap;
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$wrapdef = $definition->info[$wrapname];
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$elements = $wrapdef->child->getAllowedElements($config);
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if (isset($elements[$token->name])) {
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$parent_elements = $definition->info[$parent->name]->child->getAllowedElements($config);
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if (isset($elements[$token->name]) && isset($parent_elements[$wrapname])) {
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$newtoken = new HTMLPurifier_Token_Start($wrapname);
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$this->insertBefore($newtoken);
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$reprocess = true;
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