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<?php namespace App\Libraries; class Clean_data { /** * XSS Hash * * Random Hash for protecting URLs. * * @var string */ protected $_xss_hash; /** * Character set * * Will be overridden by the constructor. * * @var string */ public $charset = 'UTF-8'; /** * List of never allowed strings * * @var array */ protected $_never_allowed_str = array( 'document.cookie' => '[removed]', '(document).cookie' => '[removed]', 'document.write' => '[removed]', '(document).write' => '[removed]', '.parentNode' => '[removed]', '.innerHTML' => '[removed]', '-moz-binding' => '[removed]', '<!--' => '<!--', '-->' => '-->', '<![CDATA[' => '<![CDATA[', '<comment>' => '<comment>', '<%' => '<%' ); /** * List of never allowed regex replacements * * @var array */ protected $_never_allowed_regex = array( 'javascript\s*:', '(\(?document\)?|\(?window\)?(\.document)?)\.(location|on\w*)', 'expression\s*(\(|&\#40;)', // CSS and IE 'vbscript\s*:', // IE, surprise! 'wscript\s*:', // IE 'jscript\s*:', // IE 'vbs\s*:', // IE 'Redirect\s+30\d', "([\"'])?data\s*:[^\\1]*?base64[^\\1]*?,[^\\1]*?\\1?" ); /** * XSS Clean * * Sanitizes data so that Cross Site Scripting Hacks can be * prevented. This method does a fair amount of work but * it is extremely thorough, designed to prevent even the * most obscure XSS attempts. Nothing is ever 100% foolproof, * of course, but I haven't been able to get anything passed * the filter. * * Note: Should only be used to deal with data upon submission. * It's not something that should be used for general * runtime processing. * * @link http://channel.bitflux.ch/wiki/XSS_Prevention * Based in part on some code and ideas from Bitflux. * * @link http://ha.ckers.org/xss.html * To help develop this script I used this great list of * vulnerabilities along with a few other hacks I've * harvested from examining vulnerabilities in other programs. * * @param string|string[] $str Input data * @param bool $is_image Whether the input is an image * @return string */ public function xss_clean($str, $is_image = FALSE) { // Is the string an array? if (is_array($str)) { foreach ($str as $key => &$value) { $str[$key] = $this->xss_clean($value); } return $str; } // Remove Invisible Characters $str = is_null($str) ? "" : $str; $str = remove_invisible_characters($str); /* * URL Decode * * Just in case stuff like this is submitted: * * <a href="http://%77%77%77%2E%67%6F%6F%67%6C%65%2E%63%6F%6D">Google</a> * * Note: Use rawurldecode() so it does not remove plus signs */ if (stripos($str, '%') !== false) { do { $oldstr = $str; $str = rawurldecode($str); $str = preg_replace_callback('#%(?:\s*[0-9a-f]){2,}#i', array($this, '_urldecodespaces'), $str); } while ($oldstr !== $str); unset($oldstr); } /* * Convert character entities to ASCII * * This permits our tests below to work reliably. * We only convert entities that are within tags since * these are the ones that will pose security problems. */ $str = preg_replace_callback("/[^a-z0-9>]+[a-z0-9]+=([\'\"]).*?\\1/si", array($this, '_convert_attribute'), $str); $str = preg_replace_callback('/<\w+.*/si', array($this, '_decode_entity'), $str); // Remove Invisible Characters Again! $str = remove_invisible_characters($str); /* * Convert all tabs to spaces * * This prevents strings like this: ja vascript * NOTE: we deal with spaces between characters later. * NOTE: preg_replace was found to be amazingly slow here on * large blocks of data, so we use str_replace. */ $str = str_replace("\t", ' ', $str); // Capture converted string for later comparison $converted_string = $str; // Remove Strings that are never allowed $str = $this->_do_never_allowed($str); /* * Makes PHP tags safe * * Note: XML tags are inadvertently replaced too: * * <?xml * * But it doesn't seem to pose a problem. */ if ($is_image === TRUE) { // Images have a tendency to have the PHP short opening and // closing tags every so often so we skip those and only // do the long opening tags. $str = preg_replace('/<\?(php)/i', '<?\\1', $str); } else { $str = str_replace(array('<?', '?' . '>'), array('<?', '?>'), $str); } /* * Compact any exploded words * * This corrects words like: j a v a s c r i p t * These words are compacted back to their correct state. */ $words = array( 'javascript', 'expression', 'vbscript', 'jscript', 'wscript', 'vbs', 'script', 'base64', 'applet', 'alert', 'document', 'write', 'cookie', 'window', 'confirm', 'prompt', 'eval' ); foreach ($words as $word) { $word = implode('\s*', str_split($word)) . '\s*'; // We only want to do this when it is followed by a non-word character // That way valid stuff like "dealer to" does not become "dealerto" $str = preg_replace_callback('#(' . substr($word, 0, -3) . ')(\W)#is', array($this, '_compact_exploded_words'), $str); } /* * Remove disallowed Javascript in links or img tags * We used to do some version comparisons and use of stripos(), * but it is dog slow compared to these simplified non-capturing * preg_match(), especially if the pattern exists in the string * * Note: It was reported that not only space characters, but all in * the following pattern can be parsed as separators between a tag name * and its attributes: [\d\s"\'`;,\/\=\(\x00\x0B\x09\x0C] * ... however, remove_invisible_characters() above already strips the * hex-encoded ones, so we'll skip them below. */ do { $original = $str; if (preg_match('/<a/i', $str)) { $str = preg_replace_callback('#<a(?:rea)?[^a-z0-9>]+([^>]*?)(?:>|$)#si', array($this, '_js_link_removal'), $str); } if (preg_match('/<img/i', $str)) { $str = preg_replace_callback('#<img[^a-z0-9]+([^>]*?)(?:\s?/?>|$)#si', array($this, '_js_img_removal'), $str); } if (preg_match('/script|xss/i', $str)) { $str = preg_replace('#</*(?:script|xss).*?>#si', '[removed]', $str); } } while ($original !== $str); unset($original); /* * Sanitize naughty HTML elements * * If a tag containing any of the words in the list * below is found, the tag gets converted to entities. * * So this: <blink> * Becomes: <blink> */ $pattern = '#' . '<((?<slash>/*\s*)((?<tagName>[a-z0-9]+)(?=[^a-z0-9]|$)|.+)' // tag start and name, followed by a non-tag character . '[^\s\042\047a-z0-9>/=]*' // a valid attribute character immediately after the tag would count as a separator // optional attributes . '(?<attributes>(?:[\s\042\047/=]*' // non-attribute characters, excluding > (tag close) for obvious reasons . '[^\s\042\047>/=]+' // attribute characters // optional attribute-value . '(?:\s*=' // attribute-value separator . '(?:[^\s\042\047=><`]+|\s*\042[^\042]*\042|\s*\047[^\047]*\047|\s*(?U:[^\s\042\047=><`]*))' // single, double or non-quoted value . ')?' // end optional attribute-value group . ')*)' // end optional attributes group . '[^>]*)(?<closeTag>\>)?#isS'; // Note: It would be nice to optimize this for speed, BUT // only matching the naughty elements here results in // false positives and in turn - vulnerabilities! do { $old_str = $str; $str = preg_replace_callback($pattern, array($this, '_sanitize_naughty_html'), $str); } while ($old_str !== $str); unset($old_str); /* * Sanitize naughty scripting elements * * Similar to above, only instead of looking for * tags it looks for PHP and JavaScript commands * that are disallowed. Rather than removing the * code, it simply converts the parenthesis to entities * rendering the code un-executable. * * For example: eval('some code') * Becomes: eval('some code') */ $str = preg_replace( '#(alert|prompt|confirm|cmd|passthru|eval|exec|expression|system|fopen|fsockopen|file|file_get_contents|readfile|unlink)(\s*)\((.*?)\)#si', '\\1\\2(\\3)', $str ); // Same thing, but for "tag functions" (e.g. eval`some code`) // See https://github.com/bcit-ci/CodeIgniter/issues/5420 $str = preg_replace( '#(alert|prompt|confirm|cmd|passthru|eval|exec|expression|system|fopen|fsockopen|file|file_get_contents|readfile|unlink)(\s*)`(.*?)`#si', '\\1\\2`\\3`', $str ); // Final clean up // This adds a bit of extra precaution in case // something got through the above filters $str = $this->_do_never_allowed($str); /* * Images are Handled in a Special Way * - Essentially, we want to know that after all of the character * conversion is done whether any unwanted, likely XSS, code was found. * If not, we return TRUE, as the image is clean. * However, if the string post-conversion does not matched the * string post-removal of XSS, then it fails, as there was unwanted XSS * code found and removed/changed during processing. */ if ($is_image === TRUE) { return ($str === $converted_string); } return $str; } /** * Do Never Allowed * * @used-by CI_Security::xss_clean() * @param string * @return string */ protected function _do_never_allowed($str) { $str = str_replace(array_keys($this->_never_allowed_str), $this->_never_allowed_str, $str); foreach ($this->_never_allowed_regex as $regex) { $str = preg_replace('#' . $regex . '#is', '[removed]', $str); } return $str; } /** * Attribute Conversion * * @used-by CI_Security::xss_clean() * @param array $match * @return string */ protected function _convert_attribute($match) { return str_replace(array('>', '<', '\\'), array('>', '<', '\\\\'), $match[0]); } /** * HTML Entity Decode Callback * * @used-by CI_Security::xss_clean() * @param array $match * @return string */ protected function _decode_entity($match) { // Protect GET variables in URLs // 901119URL5918AMP18930PROTECT8198 $match = preg_replace('|\&([a-z\_0-9\-]+)\=([a-z\_0-9\-/]+)|i', $this->xss_hash() . '\\1=\\2', $match[0]); // Decode, then un-protect URL GET vars return str_replace( $this->xss_hash(), '&', $this->entity_decode($match, $this->charset) ); } /** * XSS Hash * * Generates the XSS hash if needed and returns it. * * @see CI_Security::$_xss_hash * @return string XSS hash */ public function xss_hash() { if ($this->_xss_hash === NULL) { $rand = $this->get_random_bytes(16); $this->_xss_hash = ($rand === FALSE) ? md5(uniqid(mt_rand(), TRUE)) : bin2hex($rand); } return $this->_xss_hash; } /** * HTML Entities Decode * * A replacement for html_entity_decode() * * The reason we are not using html_entity_decode() by itself is because * while it is not technically correct to leave out the semicolon * at the end of an entity most browsers will still interpret the entity * correctly. html_entity_decode() does not convert entities without * semicolons, so we are left with our own little solution here. Bummer. * * @link http://php.net/html-entity-decode * * @param string $str Input * @param string $charset Character set * @return string */ public function entity_decode($str, $charset = NULL) { if (strpos($str, '&') === FALSE) { return $str; } static $_entities; isset($charset) OR $charset = $this->charset; $flag = $this->is_php('5.4') ? ENT_COMPAT | ENT_HTML5 : ENT_COMPAT; if (!isset($_entities)) { $_entities = array_map('strtolower', get_html_translation_table(HTML_ENTITIES, $flag, $charset)); // If we're not on PHP 5.4+, add the possibly dangerous HTML 5 // entities to the array manually if ($flag === ENT_COMPAT) { $_entities[':'] = ':'; $_entities['('] = '('; $_entities[')'] = ')'; $_entities["\n"] = '
'; $_entities["\t"] = '	'; } } do { $str_compare = $str; // Decode standard entities, avoiding false positives if (preg_match_all('/&[a-z]{2,}(?![a-z;])/i', $str, $matches)) { $replace = array(); $matches = array_unique(array_map('strtolower', $matches[0])); foreach ($matches as &$match) { if (($char = array_search($match . ';', $_entities, TRUE)) !== FALSE) { $replace[$match] = $char; } } $str = str_replace(array_keys($replace), array_values($replace), $str); } // Decode numeric & UTF16 two byte entities $str = html_entity_decode( preg_replace('/(&#(?:x0*[0-9a-f]{2,5}(?![0-9a-f;])|(?:0*\d{2,4}(?![0-9;]))))/iS', '$1;', $str), $flag, $charset ); if ($flag === ENT_COMPAT) { $str = str_replace(array_values($_entities), array_keys($_entities), $str); } } while ($str_compare !== $str); return $str; } /** * Determines if the current version of PHP is equal to or greater than the supplied value * * @param string * @return bool TRUE if the current version is $version or higher */ private function is_php($version) { static $_is_php; $version = (string) $version; if (!isset($_is_php[$version])) { $_is_php[$version] = version_compare(PHP_VERSION, $version, '>='); } return $_is_php[$version]; } /** * Get random bytes * * @param int $length Output length * @return string */ public function get_random_bytes($length) { if (empty($length) OR ! ctype_digit((string) $length)) { return FALSE; } if (function_exists('random_bytes')) { try { // The cast is required to avoid TypeError return random_bytes((int) $length); } catch (Exception $e) { // If random_bytes() can't do the job, we can't either ... // There's no point in using fallbacks. log_message('error', $e->getMessage()); return FALSE; } } // Unfortunately, none of the following PRNGs is guaranteed to exist ... if (defined('MCRYPT_DEV_URANDOM') && ($output = mcrypt_create_iv($length, MCRYPT_DEV_URANDOM)) !== FALSE) { return $output; } if (is_readable('/dev/urandom') && ($fp = fopen('/dev/urandom', 'rb')) !== FALSE) { // Try not to waste entropy ... $this->is_php('5.4') && stream_set_chunk_size($fp, $length); $output = fread($fp, $length); fclose($fp); if ($output !== FALSE) { return $output; } } if (function_exists('openssl_random_pseudo_bytes')) { return openssl_random_pseudo_bytes($length); } return FALSE; } /** * JS Image Removal * * Callback method for xss_clean() to sanitize image tags. * * This limits the PCRE backtracks, making it more performance friendly * and prevents PREG_BACKTRACK_LIMIT_ERROR from being triggered in * PHP 5.2+ on image tag heavy strings. * * @used-by CI_Security::xss_clean() * @param array $match * @return string */ protected function _js_img_removal($match) { return str_replace( $match[1], preg_replace( '#src=.*?(?:(?:alert|prompt|confirm|eval)(?:\(|&\#40;|`|&\#96;)|javascript:|livescript:|mocha:|charset=|window\.|\(?document\)?\.|\.cookie|<script|<xss|base64\s*,)#si', '', $this->_filter_attributes($match[1]) ), $match[0] ); } /** * Filter Attributes * * Filters tag attributes for consistency and safety. * * @used-by CI_Security::_js_img_removal() * @used-by CI_Security::_js_link_removal() * @param string $str * @return string */ protected function _filter_attributes($str) { $out = ''; if (preg_match_all('#\s*[a-z\-]+\s*=\s*(\042|\047)([^\\1]*?)\\1#is', $str, $matches)) { foreach ($matches[0] as $match) { $out .= preg_replace('#/\*.*?\*/#s', '', $match); } } return $out; } /** * Compact Exploded Words * * Callback method for xss_clean() to remove whitespace from * things like 'j a v a s c r i p t'. * * @used-by CI_Security::xss_clean() * @param array $matches * @return string */ protected function _compact_exploded_words($matches) { return preg_replace('/\s+/s', '', $matches[1]) . $matches[2]; } /** * URL-decode taking spaces into account * * @see https://github.com/bcit-ci/CodeIgniter/issues/4877 * @param array $matches * @return string */ protected function _urldecodespaces($matches) { $input = $matches[0]; $nospaces = preg_replace('#\s+#', '', $input); return ($nospaces === $input) ? $input : rawurldecode($nospaces); } /** * JS Link Removal * * Callback method for xss_clean() to sanitize links. * * This limits the PCRE backtracks, making it more performance friendly * and prevents PREG_BACKTRACK_LIMIT_ERROR from being triggered in * PHP 5.2+ on link-heavy strings. * * @used-by CI_Security::xss_clean() * @param array $match * @return string */ protected function _js_link_removal($match) { return str_replace( $match[1], preg_replace( '#href=.*?(?:(?:alert|prompt|confirm)(?:\(|&\#40;|`|&\#96;)|javascript:|livescript:|mocha:|charset=|window\.|\(?document\)?\.|\.cookie|<script|<xss|d\s*a\s*t\s*a\s*:)#si', '', $this->_filter_attributes($match[1]) ), $match[0] ); } /** * Sanitize Naughty HTML * * Callback method for xss_clean() to remove naughty HTML elements. * * @used-by CI_Security::xss_clean() * @param array $matches * @return string */ protected function _sanitize_naughty_html($matches) { static $naughty_tags = array( 'alert', 'area', 'prompt', 'confirm', 'applet', 'audio', 'basefont', 'base', 'behavior', 'bgsound', 'blink', 'body', 'embed', 'expression', 'form', 'frameset', 'frame', 'head', 'html', 'ilayer', 'iframe', 'input', 'button', 'select', 'isindex', 'layer', 'link', 'meta', 'keygen', 'object', 'plaintext', 'style', 'script', 'textarea', 'title', 'math', 'video', 'svg', 'xml', 'xss' ); static $evil_attributes = array( 'on\w+', 'style', 'xmlns', 'formaction', 'form', 'xlink:href', 'FSCommand', 'seekSegmentTime' ); // First, escape unclosed tags if (empty($matches['closeTag'])) { return '<' . $matches[1]; } // Is the element that we caught naughty? If so, escape it elseif (in_array(strtolower($matches['tagName']), $naughty_tags, TRUE)) { return '<' . $matches[1] . '>'; } // For other tags, see if their attributes are "evil" and strip those elseif (isset($matches['attributes'])) { // We'll store the already filtered attributes here $attributes = array(); // Attribute-catching pattern $attributes_pattern = '#' . '(?<name>[^\s\042\047>/=]+)' // attribute characters // optional attribute-value . '(?:\s*=(?<value>[^\s\042\047=><`]+|\s*\042[^\042]*\042|\s*\047[^\047]*\047|\s*(?U:[^\s\042\047=><`]*)))' // attribute-value separator . '#i'; // Blacklist pattern for evil attribute names $is_evil_pattern = '#^(' . implode('|', $evil_attributes) . ')$#i'; // Each iteration filters a single attribute do { // Strip any non-alpha characters that may precede an attribute. // Browsers often parse these incorrectly and that has been a // of numerous XSS issues we've had. $matches['attributes'] = preg_replace('#^[^a-z]+#i', '', $matches['attributes']); if (!preg_match($attributes_pattern, $matches['attributes'], $attribute, PREG_OFFSET_CAPTURE)) { // No (valid) attribute found? Discard everything else inside the tag break; } if ( // Is it indeed an "evil" attribute? preg_match($is_evil_pattern, $attribute['name'][0]) // Or does it have an equals sign, but no value and not quoted? Strip that too! OR ( trim($attribute['value'][0]) === '') ) { $attributes[] = 'xss=removed'; } else { $attributes[] = $attribute[0][0]; } $matches['attributes'] = substr($matches['attributes'], $attribute[0][1] + strlen($attribute[0][0])); } while ($matches['attributes'] !== ''); $attributes = empty($attributes) ? '' : ' ' . implode(' ', $attributes); return '<' . $matches['slash'] . $matches['tagName'] . $attributes . '>'; } return $matches[0]; } }
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