Propset eol-style to CRLF

simplified paragraph tag cleanup regex

1 files changed, 1058 insertions, 1058 deletions

diff --git a/system/libraries/Input.php b/system/libraries/Input.php
index f26df7552..fe76559fe 100644
--- a/system/libraries/Input.php
+++ b/system/libraries/Input.php
@@ -1,1059 +1,1059 @@
-<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
-/**
- * CodeIgniter
- *
- * An open source application development framework for PHP 4.3.2 or newer
- *
- * @package		CodeIgniter
- * @author		ExpressionEngine Dev Team
- * @copyright	Copyright (c) 2008, EllisLab, Inc.
- * @license		http://codeigniter.com/user_guide/license.html
- * @link		http://codeigniter.com
- * @since		Version 1.0
- * @filesource
- */
-
-// ------------------------------------------------------------------------
-
-/**
- * Input Class
- *
- * Pre-processes global input data for security
- *
- * @package		CodeIgniter
- * @subpackage	Libraries
- * @category	Input
- * @author		ExpressionEngine Dev Team
- * @link		http://codeigniter.com/user_guide/libraries/input.html
- */
-class CI_Input {
-	var $use_xss_clean		= FALSE;
-	var $xss_hash			= '';
-	var $ip_address			= FALSE;
-	var $user_agent			= FALSE;
-	var $allow_get_array	= FALSE;
-
-	/* never allowed, string replacement */
-	var $never_allowed_str = array(
-									'document.cookie'	=> '[removed]',
-									'document.write'	=> '[removed]',
-									'.parentNode'		=> '[removed]',
-									'.innerHTML'		=> '[removed]',
-									'window.location'	=> '[removed]',
-									'-moz-binding'		=> '[removed]',
-									'<!--'				=> '&lt;!--',
-									'-->'				=> '--&gt;',
-									'<![CDATA['			=> '&lt;![CDATA['
-									);
-	/* never allowed, regex replacement */
-	var $never_allowed_regex = array(
-										"javascript\s*:"	=> '[removed]',
-										"expression\s*\("	=> '[removed]', // CSS and IE
-										"Redirect\s+302"	=> '[removed]'
-									);
-
-	/**
-	* Constructor
-	*
-	* Sets whether to globally enable the XSS processing
-	* and whether to allow the $_GET array
-	*
-	* @access	public
-	*/
-	function CI_Input()
-	{
-		log_message('debug', "Input Class Initialized");
-
-		$CFG =& load_class('Config');
-		$this->use_xss_clean	= ($CFG->item('global_xss_filtering') === TRUE) ? TRUE : FALSE;
-		$this->allow_get_array	= ($CFG->item('enable_query_strings') === TRUE) ? TRUE : FALSE;
-		$this->_sanitize_globals();
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	* Sanitize Globals
-	*
-	* This function does the following:
-	*
-	* Unsets $_GET data (if query strings are not enabled)
-	*
-	* Unsets all globals if register_globals is enabled
-	*
-	* Standardizes newline characters to \n
-	*
-	* @access	private
-	* @return	void
-	*/
-	function _sanitize_globals()
-	{
-		// Would kind of be "wrong" to unset any of these GLOBALS
-		$protected = array('_SERVER', '_GET', '_POST', '_FILES', '_REQUEST', '_SESSION', '_ENV', 'GLOBALS', 'HTTP_RAW_POST_DATA',
-							'system_folder', 'application_folder', 'BM', 'EXT', 'CFG', 'URI', 'RTR', 'OUT', 'IN');
-
-		// Unset globals for security. 
-		// This is effectively the same as register_globals = off
-		foreach (array($_GET, $_POST, $_COOKIE, $_SERVER, $_FILES, $_ENV, (isset($_SESSION) && is_array($_SESSION)) ? $_SESSION : array()) as $global)
-		{
-			if ( ! is_array($global))
-			{
-				if ( ! in_array($global, $protected))
-				{
-					unset($GLOBALS[$global]);
-				}
-			}
-			else
-			{
-				foreach ($global as $key => $val)
-				{
-					if ( ! in_array($key, $protected))
-					{
-						unset($GLOBALS[$key]);
-					}
-
-					if (is_array($val))
-					{
-						foreach($val as $k => $v)
-						{
-							if ( ! in_array($k, $protected))
-							{
-								unset($GLOBALS[$k]);
-							}
-						}
-					}
-				}
-			}
-		}
-
-		// Is $_GET data allowed? If not we'll set the $_GET to an empty array
-		if ($this->allow_get_array == FALSE)
-		{
-			$_GET = array();
-		}
-		else
-		{
-			$_GET = $this->_clean_input_data($_GET);
-		}
-
-		// Clean $_POST Data
-		$_POST = $this->_clean_input_data($_POST);
-
-		// Clean $_COOKIE Data
-		// Also get rid of specially treated cookies that might be set by a server
-		// or silly application, that are of no use to a CI application anyway
-		// but that when present will trip our 'Disallowed Key Characters' alarm
-		// http://www.ietf.org/rfc/rfc2109.txt
-		// note that the key names below are single quoted strings, and are not PHP variables
-		unset($_COOKIE['$Version']);
-		unset($_COOKIE['$Path']);
-		unset($_COOKIE['$Domain']);
-		$_COOKIE = $this->_clean_input_data($_COOKIE);
-
-		log_message('debug', "Global POST and COOKIE data sanitized");
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	* Clean Input Data
-	*
-	* This is a helper function. It escapes data and
-	* standardizes newline characters to \n
-	*
-	* @access	private
-	* @param	string
-	* @return	string
-	*/
-	function _clean_input_data($str)
-	{
-		if (is_array($str))
-		{
-			$new_array = array();
-			foreach ($str as $key => $val)
-			{
-				$new_array[$this->_clean_input_keys($key)] = $this->_clean_input_data($val);
-			}
-			return $new_array;
-		}
-
-		// We strip slashes if magic quotes is on to keep things consistent
-		if (get_magic_quotes_gpc())
-		{
-			$str = stripslashes($str);
-		}
-
-		// Should we filter the input data?
-		if ($this->use_xss_clean === TRUE)
-		{
-			$str = $this->xss_clean($str);
-		}
-
-		// Standardize newlines
-		if (strpos($str, "\r") !== FALSE)
-		{
-			$str = str_replace(array("\r\n", "\r"), "\n", $str);
-		}
-
-		return $str;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	* Clean Keys
-	*
-	* This is a helper function. To prevent malicious users
-	* from trying to exploit keys we make sure that keys are
-	* only named with alpha-numeric text and a few other items.
-	*
-	* @access	private
-	* @param	string
-	* @return	string
-	*/
-	function _clean_input_keys($str)
-	{
-		if ( ! preg_match("/^[a-z0-9:_\/-]+$/i", $str))
-		{
-			exit('Disallowed Key Characters.');
-		}
-
-		return $str;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	* Fetch from array
-	*
-	* This is a helper function to retrieve values from global arrays
-	*
-	* @access	private
-	* @param	array
-	* @param	string
-	* @param	bool
-	* @return	string
-	*/
-	function _fetch_from_array(&$array, $index = '', $xss_clean = FALSE)
-	{
-		if ( ! isset($array[$index]))
-		{
-			return FALSE;
-		}
-
-		if ($xss_clean === TRUE)
-		{
-			return $this->xss_clean($array[$index]);
-		}
-
-		return $array[$index];
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	* Fetch an item from the GET array
-	*
-	* @access	public
-	* @param	string
-	* @param	bool
-	* @return	string
-	*/
-	function get($index = '', $xss_clean = FALSE)
-	{
-		return $this->_fetch_from_array($_GET, $index, $xss_clean);
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	* Fetch an item from the POST array
-	*
-	* @access	public
-	* @param	string
-	* @param	bool
-	* @return	string
-	*/
-	function post($index = '', $xss_clean = FALSE)
-	{
-		return $this->_fetch_from_array($_POST, $index, $xss_clean);
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	* Fetch an item from either the GET array or the POST
-	*
-	* @access	public
-	* @param	string	The index key
-	* @param	bool	XSS cleaning
-	* @return	string
-	*/
-	function get_post($index = '', $xss_clean = FALSE)
-	{
-		if ( ! isset($_POST[$index]) )
-		{
-			return $this->get($index, $xss_clean);
-		}
-		else
-		{
-			return $this->post($index, $xss_clean);
-		}
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	* Fetch an item from the COOKIE array
-	*
-	* @access	public
-	* @param	string
-	* @param	bool
-	* @return	string
-	*/
-	function cookie($index = '', $xss_clean = FALSE)
-	{
-		return $this->_fetch_from_array($_COOKIE, $index, $xss_clean);
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	* Fetch an item from the SERVER array
-	*
-	* @access	public
-	* @param	string
-	* @param	bool
-	* @return	string
-	*/
-	function server($index = '', $xss_clean = FALSE)
-	{
-		return $this->_fetch_from_array($_SERVER, $index, $xss_clean);
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	* Fetch the IP Address
-	*
-	* @access	public
-	* @return	string
-	*/
-	function ip_address()
-	{
-		if ($this->ip_address !== FALSE)
-		{
-			return $this->ip_address;
-		}
-
-		if ($this->server('REMOTE_ADDR') AND $this->server('HTTP_CLIENT_IP'))
-		{
-			$this->ip_address = $_SERVER['HTTP_CLIENT_IP'];
-		}
-		elseif ($this->server('REMOTE_ADDR'))
-		{
-			$this->ip_address = $_SERVER['REMOTE_ADDR'];
-		}
-		elseif ($this->server('HTTP_CLIENT_IP'))
-		{
-			$this->ip_address = $_SERVER['HTTP_CLIENT_IP'];
-		}
-		elseif ($this->server('HTTP_X_FORWARDED_FOR'))
-		{
-			$this->ip_address = $_SERVER['HTTP_X_FORWARDED_FOR'];
-		}
-
-		if ($this->ip_address === FALSE)
-		{
-			$this->ip_address = '0.0.0.0';
-			return $this->ip_address;
-		}
-
-		if (strstr($this->ip_address, ','))
-		{
-			$x = explode(',', $this->ip_address);
-			$this->ip_address = end($x);
-		}
-
-		if ( ! $this->valid_ip($this->ip_address))
-		{
-			$this->ip_address = '0.0.0.0';
-		}
-
-		return $this->ip_address;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	* Validate IP Address
-	*
-	* Updated version suggested by Geert De Deckere
-	* 
-	* @access	public
-	* @param	string
-	* @return	string
-	*/
-	function valid_ip($ip)
-	{
-		$ip_segments = explode('.', $ip);
-
-		// Always 4 segments needed
-		if (count($ip_segments) != 4)
-		{
-			return FALSE;
-		}
-		// IP can not start with 0
-		if ($ip_segments[0][0] == '0')
-		{
-			return FALSE;
-		}
-		// Check each segment
-		foreach ($ip_segments as $segment)
-		{
-			// IP segments must be digits and can not be 
-			// longer than 3 digits or greater then 255
-			if ($segment == '' OR preg_match("/[^0-9]/", $segment) OR $segment > 255 OR strlen($segment) > 3)
-			{
-				return FALSE;
-			}
-		}
-
-		return TRUE;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	* User Agent
-	*
-	* @access	public
-	* @return	string
-	*/
-	function user_agent()
-	{
-		if ($this->user_agent !== FALSE)
-		{
-			return $this->user_agent;
-		}
-
-		$this->user_agent = ( ! isset($_SERVER['HTTP_USER_AGENT'])) ? FALSE : $_SERVER['HTTP_USER_AGENT'];
-
-		return $this->user_agent;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	* Filename Security
-	*
-	* @access	public
-	* @param	string
-	* @return	string
-	*/
-	function filename_security($str)
-	{
-		$bad = array(
-						"../",
-						"./",
-						"<!--",
-						"-->",
-						"<",
-						">",
-						"'",
-						'"',
-						'&',
-						'$',
-						'#',
-						'{',
-						'}',
-						'[',
-						']',
-						'=',
-						';',
-						'?',
-						"%20",
-						"%22",
-						"%3c",		// <
-						"%253c", 	// <
-						"%3e", 		// >
-						"%0e", 		// >
-						"%28", 		// (  
-						"%29", 		// ) 
-						"%2528", 	// (
-						"%26", 		// &
-						"%24", 		// $
-						"%3f", 		// ?
-						"%3b", 		// ;
-						"%3d"		// =
-					);
-
-		return stripslashes(str_replace($bad, '', $str));
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	* XSS Clean
-	*
-	* Sanitizes data so that Cross Site Scripting Hacks can be
-	* prevented.  This function does a fair amount of work but
-	* it is extremely thorough, designed to prevent even the
-	* most obscure XSS attempts.  Nothing is ever 100% foolproof,
-	* of course, but I haven't been able to get anything passed
-	* the filter.
-	*
-	* Note: This function should only be used to deal with data
-	* upon submission.  It's not something that should
-	* be used for general runtime processing.
-	*
-	* This function was based in part on some code and ideas I
-	* got from Bitflux: http://blog.bitflux.ch/wiki/XSS_Prevention
-	*
-	* To help develop this script I used this great list of
-	* vulnerabilities along with a few other hacks I've
-	* harvested from examining vulnerabilities in other programs:
-	* http://ha.ckers.org/xss.html
-	*
-	* @access	public
-	* @param	string
-	* @return	string
-	*/
-	function xss_clean($str, $is_image = FALSE)
-	{
-		/*
-		* Is the string an array?
-		*
-		*/
-		if (is_array($str))
-		{
-			while (list($key) = each($str))
-			{
-				$str[$key] = $this->xss_clean($str[$key]);
-			}
-
-			return $str;
-		}
-
-		/*
-		* Remove Invisible Characters
-		*/
-		$str = $this->_remove_invisible_characters($str);
-
-		/*
-		* Protect GET variables in URLs
-		*/
-
-		// 901119URL5918AMP18930PROTECT8198
-
-		$str = preg_replace('|\&([a-z\_0-9]+)\=([a-z\_0-9]+)|i', $this->xss_hash()."\\1=\\2", $str);
-
-		/*
-		* Validate standard character entities
-		*
-		* Add a semicolon if missing.  We do this to enable
-		* the conversion of entities to ASCII later.
-		*
-		*/
-		$str = preg_replace('#(&\#?[0-9a-z]{2,})[\x00-\x20]*;?#i', "\\1;", $str);
-
-		/*
-		* Validate UTF16 two byte encoding (x00) 
-		*
-		* Just as above, adds a semicolon if missing.
-		*
-		*/
-		$str = preg_replace('#(&\#x?)([0-9A-F]+);?#i',"\\1\\2;",$str);
-
-		/*
-		* Un-Protect GET variables in URLs
-		*/
-		$str = str_replace($this->xss_hash(), '&', $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
-		*
-		*/
-		$str = rawurldecode($str);
-
-		/*
-		* 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.
-		*
-		*/
-
-		$str = preg_replace_callback("/[a-z]+=([\'\"]).*?\\1/si", array($this, '_convert_attribute'), $str);
-
-		$str = preg_replace_callback("/<\w+.*?(?=>|<|$)/si", array($this, '_html_entity_decode_callback'), $str);
-
-		/*
-		* Remove Invisible Characters Again!
-		*/
-		$str = $this->_remove_invisible_characters($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.
-		*
-		*/
-
- 		if (strpos($str, "\t") !== FALSE)
-		{
-			$str = str_replace("\t", ' ', $str);
-		}
-
-		/*
-		* Capture converted string for later comparison
-		*/
-		$converted_string = $str;
-
-		/*
-		* Not Allowed Under Any Conditions
-		*/
-
-		foreach ($this->never_allowed_str as $key => $val)
-		{
-			$str = str_replace($key, $val, $str);   
-		}
-
-		foreach ($this->never_allowed_regex as $key => $val)
-		{
-			$str = preg_replace("#".$key."#i", $val, $str);   
-		}
-
-		/*
-		* Makes PHP tags safe
-		*
-		*  Note: XML tags are inadvertently replaced too:
-		*
-		*	<?xml
-		*
-		* But it doesn't seem to pose a problem.
-		*
-		*/
-		if ($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 = str_replace(array('<?php', '<?PHP'),  array('&lt;?php', '&lt;?PHP'), $str);
-		}
-		else
-		{
-			$str = str_replace(array('<?php', '<?PHP', '<?', '?'.'>'),  array('&lt;?php', '&lt;?PHP', '&lt;?', '?&gt;'), $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.
-		*
-		*/
-		$words = array('javascript', 'expression', 'vbscript', 'script', 'applet', 'alert', 'document', 'write', 'cookie', 'window');
-		foreach ($words as $word)
-		{
-			$temp = '';
-
-			for ($i = 0, $wordlen = strlen($word); $i < $wordlen; $i++)
-			{
-				$temp .= substr($word, $i, 1)."\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"
-			$str = preg_replace_callback('#('.substr($temp, 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 for PHP5, but it is dog slow compared
-		* to these simplified non-capturing preg_match(), especially if the pattern exists in the string
-		*/
-		do
-		{
-			$original = $str;
-
-			if (preg_match("/<a/i", $str))
-			{
-				$str = preg_replace_callback("#<a\s+([^>]*?)(>|$)#si", array($this, '_js_link_removal'), $str);
-			}
-
-			if (preg_match("/<img/i", $str))
-			{
-				$str = preg_replace_callback("#<img\s+([^>]*?)(\s?/?>|$)#si", array($this, '_js_img_removal'), $str);
-			}
-
-			if (preg_match("/script/i", $str) OR preg_match("/xss/i", $str))
-			{
-				$str = preg_replace("#<(/*)(script|xss)(.*?)\>#si", '[removed]', $str);
-			}
-		}
-		while($original != $str);
-
-		unset($original);
-
-		/*
-		* Remove JavaScript Event Handlers
-		*
-		* Note: This code is a little blunt.  It removes
-		* the event handler and anything up to the closing >,
-		* but it's unlikely to be a problem.
-		*
-		*/
-		$event_handlers = array('[^a-z_\-]on\w*','xmlns');
-
-		if ($is_image === TRUE)
-		{
-			/*
-			* Adobe Photoshop puts XML metadata into JFIF images, including namespacing, 
-			* so we have to allow this for images. -Paul
-			*/
-			unset($event_handlers[array_search('xmlns', $event_handlers)]);
-		}
-
-		$str = preg_replace("#<([^><]+?)(".implode('|', $event_handlers).")(\s*=\s*[^><]*)([><]*)#i", "<\\1\\4", $str);
-
-		/*
-		* 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: &lt;blink&gt;
-		*
-		*/
-		$naughty = 'alert|applet|audio|basefont|base|behavior|bgsound|blink|body|embed|expression|form|frameset|frame|head|html|ilayer|iframe|input|isindex|layer|link|meta|object|plaintext|style|script|textarea|title|video|xml|xss';
-		$str = preg_replace_callback('#<(/*\s*)('.$naughty.')([^><]*)([><]*)#is', array($this, '_sanitize_naughty_html'), $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&#40;'some code'&#41;
-		*
-		*/
-		$str = preg_replace('#(alert|cmd|passthru|eval|exec|expression|system|fopen|fsockopen|file|file_get_contents|readfile|unlink)(\s*)\((.*?)\)#si', "\\1\\2&#40;\\3&#41;", $str);
-
-		/*
-		* Final clean up
-		*
-		* This adds a bit of extra precaution in case
-		* something got through the above filters
-		*
-		*/
-		foreach ($this->never_allowed_str as $key => $val)
-		{
-			$str = str_replace($key, $val, $str);   
-		}
-
-		foreach ($this->never_allowed_regex as $key => $val)
-		{
-			$str = preg_replace("#".$key."#i", $val, $str);
-		}
-
-		/*
-		*  Images are Handled in a Special Way
-		*  - Essentially, we want to know that after all of the character conversion is done whether
-		*  any unwanted, likely XSS, code was found.  If not, we return TRUE, as the image is clean.
-		*  However, if the string post-conversion does not matched the string post-removal of XSS,
-		*  then it fails, as there was unwanted XSS code found and removed/changed during processing.
-		*/
-
-		if ($is_image === TRUE)
-		{
-			if ($str == $converted_string)
-			{
-				return TRUE;
-			}
-			else
-			{
-				return FALSE;
-			}
-		}
-
-		log_message('debug', "XSS Filtering completed");
-		return $str;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	* Random Hash for protecting URLs
-	*
-	* @access	public
-	* @return	string
-	*/
-	function xss_hash()
-	{
-		if ($this->xss_hash == '')
-		{
-			if (phpversion() >= 4.2)
-				mt_srand();
-			else
-				mt_srand(hexdec(substr(md5(microtime()), -8)) & 0x7fffffff);
-
-			$this->xss_hash = md5(time() + mt_rand(0, 1999999999));
-		}
-
-		return $this->xss_hash;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	* Remove Invisible Characters
-	*
-	* This prevents sandwiching null characters
-	* between ascii characters, like Java\0script.
-	*
-	* @access	public
-	* @param	string
-	* @return	string
-	*/
-	function _remove_invisible_characters($str)
-	{
-		static $non_displayables;
-
-		if ( ! isset($non_displayables))
-		{
-			// every control character except newline (dec 10), carriage return (dec 13), and horizontal tab (dec 09),
-			$non_displayables = array(
-										'/%0[0-8bcef]/',			// url encoded 00-08, 11, 12, 14, 15
-										'/%1[0-9a-f]/',				// url encoded 16-31
-										'/[\x00-\x08]/',			// 00-08
-										'/\x0b/', '/\x0c/',			// 11, 12
-										'/[\x0e-\x1f]/'				// 14-31
-									);
-		}
-
-		do
-		{
-			$cleaned = $str;
-			$str = preg_replace($non_displayables, '', $str);
-		}
-		while ($cleaned != $str);
-
-		return $str;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	* Compact Exploded Words
-	*
-	* Callback function for xss_clean() to remove whitespace from
-	* things like j a v a s c r i p t
-	*
-	* @access	public
-	* @param	type
-	* @return	type
-	*/
-	function _compact_exploded_words($matches)
-	{
-		return preg_replace('/\s+/s', '', $matches[1]).$matches[2];
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	* Sanitize Naughty HTML
-	*
-	* Callback function for xss_clean() to remove naughty HTML elements
-	*
-	* @access	private
-	* @param	array
-	* @return	string
-	*/
-	function _sanitize_naughty_html($matches)
-	{
-		// encode opening brace
-		$str = '&lt;'.$matches[1].$matches[2].$matches[3];
-
-		// encode captured opening or closing brace to prevent recursive vectors
-		$str .= str_replace(array('>', '<'), array('&gt;', '&lt;'), $matches[4]);
-
-		return $str;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	* JS Link Removal
-	*
-	* Callback function for xss_clean() to sanitize links
-	* This limits the PCRE backtracks, making it more performance friendly
-	* and prevents PREG_BACKTRACK_LIMIT_ERROR from being triggered in
-	* PHP 5.2+ on link-heavy strings
-	*
-	* @access	private
-	* @param	array
-	* @return	string
-	*/
-	function _js_link_removal($match)
-	{
-		$attributes = $this->_filter_attributes(str_replace(array('<', '>'), '', $match[1]));
-		return str_replace($match[1], preg_replace("#href=.*?(alert\(|alert&\#40;|javascript\:|charset\=|window\.|document\.|\.cookie|<script|<xss|base64\s*,)#si", "", $attributes), $match[0]);
-	}
-
-	/**
-	* JS Image Removal
-	*
-	* Callback function for xss_clean() to sanitize image tags
-	* This limits the PCRE backtracks, making it more performance friendly
-	* and prevents PREG_BACKTRACK_LIMIT_ERROR from being triggered in
-	* PHP 5.2+ on image tag heavy strings
-	*
-	* @access	private
-	* @param	array
-	* @return	string
-	*/
-	function _js_img_removal($match)
-	{
-		$attributes = $this->_filter_attributes(str_replace(array('<', '>'), '', $match[1]));
-		return str_replace($match[1], preg_replace("#src=.*?(alert\(|alert&\#40;|javascript\:|charset\=|window\.|document\.|\.cookie|<script|<xss|base64\s*,)#si", "", $attributes), $match[0]);
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	* Attribute Conversion
-	*
-	* Used as a callback for XSS Clean
-	*
-	* @access	public
-	* @param	array
-	* @return	string
-	*/
-	function _convert_attribute($match)
-	{
-		return str_replace(array('>', '<'), array('&gt;', '&lt;'), $match[0]);
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	* HTML Entity Decode Callback
-	*
-	* Used as a callback for XSS Clean
-	*
-	* @access	public
-	* @param	array
-	* @return	string
-	*/
-	function _html_entity_decode_callback($match)
-	{
-		$CFG =& load_class('Config');
-		$charset = $CFG->item('charset');
-
-		return $this->_html_entity_decode($match[0], strtoupper($charset));
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	* HTML Entities Decode
-	*
-	* This function is a replacement for html_entity_decode()
-	*
-	* In some versions of PHP the native function does not work
-	* when UTF-8 is the specified character set, so this gives us
-	* a work-around.  More info here:
-	* http://bugs.php.net/bug.php?id=25670
-	*
-	* @access	private
-	* @param	string
-	* @param	string
-	* @return	string
-	*/
-	/* -------------------------------------------------
-	/*  Replacement for html_entity_decode()
-	/* -------------------------------------------------*/
-
-	/*
-	NOTE: html_entity_decode() has a bug in some PHP versions when UTF-8 is the
-	character set, and the PHP developers said they were not back porting the
-	fix to versions other than PHP 5.x.
-	*/
-	function _html_entity_decode($str, $charset='UTF-8')
-	{
-		if (stristr($str, '&') === FALSE) return $str;
-
-		// The reason we are not using html_entity_decode() by itself is because
-		// while it is not technically correct to leave out the semicolon
-		// at the end of an entity most browsers will still interpret the entity
-		// correctly.  html_entity_decode() does not convert entities without
-		// semicolons, so we are left with our own little solution here. Bummer.
-
-		if (function_exists('html_entity_decode') && (strtolower($charset) != 'utf-8' OR version_compare(phpversion(), '5.0.0', '>=')))
-		{
-			$str = html_entity_decode($str, ENT_COMPAT, $charset);
-			$str = preg_replace('~&#x(0*[0-9a-f]{2,5})~ei', 'chr(hexdec("\\1"))', $str);
-			return preg_replace('~&#([0-9]{2,4})~e', 'chr(\\1)', $str);
-		}
-
-		// Numeric Entities
-		$str = preg_replace('~&#x(0*[0-9a-f]{2,5});{0,1}~ei', 'chr(hexdec("\\1"))', $str);
-		$str = preg_replace('~&#([0-9]{2,4});{0,1}~e', 'chr(\\1)', $str);
-
-		// Literal Entities - Slightly slow so we do another check
-		if (stristr($str, '&') === FALSE)
-		{
-			$str = strtr($str, array_flip(get_html_translation_table(HTML_ENTITIES)));
-		}
-
-		return $str;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	* Filter Attributes
-	*
-	* Filters tag attributes for consistency and safety
-	*
-	* @access	public
-	* @param	string
-	* @return	string
-	*/
-	function _filter_attributes($str)
-	{
-		$out = '';
-
-		if (preg_match_all('#\s*[a-z\-]+\s*=\s*(\042|\047)([^\\1]*?)\\1#is', $str, $matches))
-		{
-			foreach ($matches[0] as $match)
-			{
-				$out .= "{$match}";
-			}
-		}
-
-		return $out;
-	}
-
-	// --------------------------------------------------------------------
-
-}
-// END Input class
-
-/* End of file Input.php */
+<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');

+/**

+ * CodeIgniter

+ *

+ * An open source application development framework for PHP 4.3.2 or newer

+ *

+ * @package		CodeIgniter

+ * @author		ExpressionEngine Dev Team

+ * @copyright	Copyright (c) 2008, EllisLab, Inc.

+ * @license		http://codeigniter.com/user_guide/license.html

+ * @link		http://codeigniter.com

+ * @since		Version 1.0

+ * @filesource

+ */

+

+// ------------------------------------------------------------------------

+

+/**

+ * Input Class

+ *

+ * Pre-processes global input data for security

+ *

+ * @package		CodeIgniter

+ * @subpackage	Libraries

+ * @category	Input

+ * @author		ExpressionEngine Dev Team

+ * @link		http://codeigniter.com/user_guide/libraries/input.html

+ */

+class CI_Input {

+	var $use_xss_clean		= FALSE;

+	var $xss_hash			= '';

+	var $ip_address			= FALSE;

+	var $user_agent			= FALSE;

+	var $allow_get_array	= FALSE;

+

+	/* never allowed, string replacement */

+	var $never_allowed_str = array(

+									'document.cookie'	=> '[removed]',

+									'document.write'	=> '[removed]',

+									'.parentNode'		=> '[removed]',

+									'.innerHTML'		=> '[removed]',

+									'window.location'	=> '[removed]',

+									'-moz-binding'		=> '[removed]',

+									'<!--'				=> '&lt;!--',

+									'-->'				=> '--&gt;',

+									'<![CDATA['			=> '&lt;![CDATA['

+									);

+	/* never allowed, regex replacement */

+	var $never_allowed_regex = array(

+										"javascript\s*:"	=> '[removed]',

+										"expression\s*\("	=> '[removed]', // CSS and IE

+										"Redirect\s+302"	=> '[removed]'

+									);

+

+	/**

+	* Constructor

+	*

+	* Sets whether to globally enable the XSS processing

+	* and whether to allow the $_GET array

+	*

+	* @access	public

+	*/

+	function CI_Input()

+	{

+		log_message('debug', "Input Class Initialized");

+

+		$CFG =& load_class('Config');

+		$this->use_xss_clean	= ($CFG->item('global_xss_filtering') === TRUE) ? TRUE : FALSE;

+		$this->allow_get_array	= ($CFG->item('enable_query_strings') === TRUE) ? TRUE : FALSE;

+		$this->_sanitize_globals();

+	}

+

+	// --------------------------------------------------------------------

+

+	/**

+	* Sanitize Globals

+	*

+	* This function does the following:

+	*

+	* Unsets $_GET data (if query strings are not enabled)

+	*

+	* Unsets all globals if register_globals is enabled

+	*

+	* Standardizes newline characters to \n

+	*

+	* @access	private

+	* @return	void

+	*/

+	function _sanitize_globals()

+	{

+		// Would kind of be "wrong" to unset any of these GLOBALS

+		$protected = array('_SERVER', '_GET', '_POST', '_FILES', '_REQUEST', '_SESSION', '_ENV', 'GLOBALS', 'HTTP_RAW_POST_DATA',

+							'system_folder', 'application_folder', 'BM', 'EXT', 'CFG', 'URI', 'RTR', 'OUT', 'IN');

+

+		// Unset globals for security. 

+		// This is effectively the same as register_globals = off

+		foreach (array($_GET, $_POST, $_COOKIE, $_SERVER, $_FILES, $_ENV, (isset($_SESSION) && is_array($_SESSION)) ? $_SESSION : array()) as $global)

+		{

+			if ( ! is_array($global))

+			{

+				if ( ! in_array($global, $protected))

+				{

+					unset($GLOBALS[$global]);

+				}

+			}

+			else

+			{

+				foreach ($global as $key => $val)

+				{

+					if ( ! in_array($key, $protected))

+					{

+						unset($GLOBALS[$key]);

+					}

+

+					if (is_array($val))

+					{

+						foreach($val as $k => $v)

+						{

+							if ( ! in_array($k, $protected))

+							{

+								unset($GLOBALS[$k]);

+							}

+						}

+					}

+				}

+			}

+		}

+

+		// Is $_GET data allowed? If not we'll set the $_GET to an empty array

+		if ($this->allow_get_array == FALSE)

+		{

+			$_GET = array();

+		}

+		else

+		{

+			$_GET = $this->_clean_input_data($_GET);

+		}

+

+		// Clean $_POST Data

+		$_POST = $this->_clean_input_data($_POST);

+

+		// Clean $_COOKIE Data

+		// Also get rid of specially treated cookies that might be set by a server

+		// or silly application, that are of no use to a CI application anyway

+		// but that when present will trip our 'Disallowed Key Characters' alarm

+		// http://www.ietf.org/rfc/rfc2109.txt

+		// note that the key names below are single quoted strings, and are not PHP variables

+		unset($_COOKIE['$Version']);

+		unset($_COOKIE['$Path']);

+		unset($_COOKIE['$Domain']);

+		$_COOKIE = $this->_clean_input_data($_COOKIE);

+

+		log_message('debug', "Global POST and COOKIE data sanitized");

+	}

+

+	// --------------------------------------------------------------------

+

+	/**

+	* Clean Input Data

+	*

+	* This is a helper function. It escapes data and

+	* standardizes newline characters to \n

+	*

+	* @access	private

+	* @param	string

+	* @return	string

+	*/

+	function _clean_input_data($str)

+	{

+		if (is_array($str))

+		{

+			$new_array = array();

+			foreach ($str as $key => $val)

+			{

+				$new_array[$this->_clean_input_keys($key)] = $this->_clean_input_data($val);

+			}

+			return $new_array;

+		}

+

+		// We strip slashes if magic quotes is on to keep things consistent

+		if (get_magic_quotes_gpc())

+		{

+			$str = stripslashes($str);

+		}

+

+		// Should we filter the input data?

+		if ($this->use_xss_clean === TRUE)

+		{

+			$str = $this->xss_clean($str);

+		}

+

+		// Standardize newlines

+		if (strpos($str, "\r") !== FALSE)

+		{

+			$str = str_replace(array("\r\n", "\r"), "\n", $str);

+		}

+

+		return $str;

+	}

+

+	// --------------------------------------------------------------------

+

+	/**

+	* Clean Keys

+	*

+	* This is a helper function. To prevent malicious users

+	* from trying to exploit keys we make sure that keys are

+	* only named with alpha-numeric text and a few other items.

+	*

+	* @access	private

+	* @param	string

+	* @return	string

+	*/

+	function _clean_input_keys($str)

+	{

+		if ( ! preg_match("/^[a-z0-9:_\/-]+$/i", $str))

+		{

+			exit('Disallowed Key Characters.');

+		}

+

+		return $str;

+	}

+

+	// --------------------------------------------------------------------

+

+	/**

+	* Fetch from array

+	*

+	* This is a helper function to retrieve values from global arrays

+	*

+	* @access	private

+	* @param	array

+	* @param	string

+	* @param	bool

+	* @return	string

+	*/

+	function _fetch_from_array(&$array, $index = '', $xss_clean = FALSE)

+	{

+		if ( ! isset($array[$index]))

+		{

+			return FALSE;

+		}

+

+		if ($xss_clean === TRUE)

+		{

+			return $this->xss_clean($array[$index]);

+		}

+

+		return $array[$index];

+	}

+

+	// --------------------------------------------------------------------

+

+	/**

+	* Fetch an item from the GET array

+	*

+	* @access	public

+	* @param	string

+	* @param	bool

+	* @return	string

+	*/

+	function get($index = '', $xss_clean = FALSE)

+	{

+		return $this->_fetch_from_array($_GET, $index, $xss_clean);

+	}

+

+	// --------------------------------------------------------------------

+

+	/**

+	* Fetch an item from the POST array

+	*

+	* @access	public

+	* @param	string

+	* @param	bool

+	* @return	string

+	*/

+	function post($index = '', $xss_clean = FALSE)

+	{

+		return $this->_fetch_from_array($_POST, $index, $xss_clean);

+	}

+

+	// --------------------------------------------------------------------

+

+	/**

+	* Fetch an item from either the GET array or the POST

+	*

+	* @access	public

+	* @param	string	The index key

+	* @param	bool	XSS cleaning

+	* @return	string

+	*/

+	function get_post($index = '', $xss_clean = FALSE)

+	{

+		if ( ! isset($_POST[$index]) )

+		{

+			return $this->get($index, $xss_clean);

+		}

+		else

+		{

+			return $this->post($index, $xss_clean);

+		}

+	}

+

+	// --------------------------------------------------------------------

+

+	/**

+	* Fetch an item from the COOKIE array

+	*

+	* @access	public

+	* @param	string

+	* @param	bool

+	* @return	string

+	*/

+	function cookie($index = '', $xss_clean = FALSE)

+	{

+		return $this->_fetch_from_array($_COOKIE, $index, $xss_clean);

+	}

+

+	// --------------------------------------------------------------------

+

+	/**

+	* Fetch an item from the SERVER array

+	*

+	* @access	public

+	* @param	string

+	* @param	bool

+	* @return	string

+	*/

+	function server($index = '', $xss_clean = FALSE)

+	{

+		return $this->_fetch_from_array($_SERVER, $index, $xss_clean);

+	}

+

+	// --------------------------------------------------------------------

+

+	/**

+	* Fetch the IP Address

+	*

+	* @access	public

+	* @return	string

+	*/

+	function ip_address()

+	{

+		if ($this->ip_address !== FALSE)

+		{

+			return $this->ip_address;

+		}

+

+		if ($this->server('REMOTE_ADDR') AND $this->server('HTTP_CLIENT_IP'))

+		{

+			$this->ip_address = $_SERVER['HTTP_CLIENT_IP'];

+		}

+		elseif ($this->server('REMOTE_ADDR'))

+		{

+			$this->ip_address = $_SERVER['REMOTE_ADDR'];

+		}

+		elseif ($this->server('HTTP_CLIENT_IP'))

+		{

+			$this->ip_address = $_SERVER['HTTP_CLIENT_IP'];

+		}

+		elseif ($this->server('HTTP_X_FORWARDED_FOR'))

+		{

+			$this->ip_address = $_SERVER['HTTP_X_FORWARDED_FOR'];

+		}

+

+		if ($this->ip_address === FALSE)

+		{

+			$this->ip_address = '0.0.0.0';

+			return $this->ip_address;

+		}

+

+		if (strstr($this->ip_address, ','))

+		{

+			$x = explode(',', $this->ip_address);

+			$this->ip_address = end($x);

+		}

+

+		if ( ! $this->valid_ip($this->ip_address))

+		{

+			$this->ip_address = '0.0.0.0';

+		}

+

+		return $this->ip_address;

+	}

+

+	// --------------------------------------------------------------------

+

+	/**

+	* Validate IP Address

+	*

+	* Updated version suggested by Geert De Deckere

+	* 

+	* @access	public

+	* @param	string

+	* @return	string

+	*/

+	function valid_ip($ip)

+	{

+		$ip_segments = explode('.', $ip);

+

+		// Always 4 segments needed

+		if (count($ip_segments) != 4)

+		{

+			return FALSE;

+		}

+		// IP can not start with 0

+		if ($ip_segments[0][0] == '0')

+		{

+			return FALSE;

+		}

+		// Check each segment

+		foreach ($ip_segments as $segment)

+		{

+			// IP segments must be digits and can not be 

+			// longer than 3 digits or greater then 255

+			if ($segment == '' OR preg_match("/[^0-9]/", $segment) OR $segment > 255 OR strlen($segment) > 3)

+			{

+				return FALSE;

+			}

+		}

+

+		return TRUE;

+	}

+

+	// --------------------------------------------------------------------

+

+	/**

+	* User Agent

+	*

+	* @access	public

+	* @return	string

+	*/

+	function user_agent()

+	{

+		if ($this->user_agent !== FALSE)

+		{

+			return $this->user_agent;

+		}

+

+		$this->user_agent = ( ! isset($_SERVER['HTTP_USER_AGENT'])) ? FALSE : $_SERVER['HTTP_USER_AGENT'];

+

+		return $this->user_agent;

+	}

+

+	// --------------------------------------------------------------------

+

+	/**

+	* Filename Security

+	*

+	* @access	public

+	* @param	string

+	* @return	string

+	*/

+	function filename_security($str)

+	{

+		$bad = array(

+						"../",

+						"./",

+						"<!--",

+						"-->",

+						"<",

+						">",

+						"'",

+						'"',

+						'&',

+						'$',

+						'#',

+						'{',

+						'}',

+						'[',

+						']',

+						'=',

+						';',

+						'?',

+						"%20",

+						"%22",

+						"%3c",		// <

+						"%253c", 	// <

+						"%3e", 		// >

+						"%0e", 		// >

+						"%28", 		// (  

+						"%29", 		// ) 

+						"%2528", 	// (

+						"%26", 		// &

+						"%24", 		// $

+						"%3f", 		// ?

+						"%3b", 		// ;

+						"%3d"		// =

+					);

+

+		return stripslashes(str_replace($bad, '', $str));

+	}

+

+	// --------------------------------------------------------------------

+

+	/**

+	* XSS Clean

+	*

+	* Sanitizes data so that Cross Site Scripting Hacks can be

+	* prevented.  This function 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: This function should only be used to deal with data

+	* upon submission.  It's not something that should

+	* be used for general runtime processing.

+	*

+	* This function was based in part on some code and ideas I

+	* got from Bitflux: http://blog.bitflux.ch/wiki/XSS_Prevention

+	*

+	* 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:

+	* http://ha.ckers.org/xss.html

+	*

+	* @access	public

+	* @param	string

+	* @return	string

+	*/

+	function xss_clean($str, $is_image = FALSE)

+	{

+		/*

+		* Is the string an array?

+		*

+		*/

+		if (is_array($str))

+		{

+			while (list($key) = each($str))

+			{

+				$str[$key] = $this->xss_clean($str[$key]);

+			}

+

+			return $str;

+		}

+

+		/*

+		* Remove Invisible Characters

+		*/

+		$str = $this->_remove_invisible_characters($str);

+

+		/*

+		* Protect GET variables in URLs

+		*/

+

+		// 901119URL5918AMP18930PROTECT8198

+

+		$str = preg_replace('|\&([a-z\_0-9]+)\=([a-z\_0-9]+)|i', $this->xss_hash()."\\1=\\2", $str);

+

+		/*

+		* Validate standard character entities

+		*

+		* Add a semicolon if missing.  We do this to enable

+		* the conversion of entities to ASCII later.

+		*

+		*/

+		$str = preg_replace('#(&\#?[0-9a-z]{2,})[\x00-\x20]*;?#i', "\\1;", $str);

+

+		/*

+		* Validate UTF16 two byte encoding (x00) 

+		*

+		* Just as above, adds a semicolon if missing.

+		*

+		*/

+		$str = preg_replace('#(&\#x?)([0-9A-F]+);?#i',"\\1\\2;",$str);

+

+		/*

+		* Un-Protect GET variables in URLs

+		*/

+		$str = str_replace($this->xss_hash(), '&', $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

+		*

+		*/

+		$str = rawurldecode($str);

+

+		/*

+		* 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.

+		*

+		*/

+

+		$str = preg_replace_callback("/[a-z]+=([\'\"]).*?\\1/si", array($this, '_convert_attribute'), $str);

+

+		$str = preg_replace_callback("/<\w+.*?(?=>|<|$)/si", array($this, '_html_entity_decode_callback'), $str);

+

+		/*

+		* Remove Invisible Characters Again!

+		*/

+		$str = $this->_remove_invisible_characters($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.

+		*

+		*/

+

+ 		if (strpos($str, "\t") !== FALSE)

+		{

+			$str = str_replace("\t", ' ', $str);

+		}

+

+		/*

+		* Capture converted string for later comparison

+		*/

+		$converted_string = $str;

+

+		/*

+		* Not Allowed Under Any Conditions

+		*/

+

+		foreach ($this->never_allowed_str as $key => $val)

+		{

+			$str = str_replace($key, $val, $str);   

+		}

+

+		foreach ($this->never_allowed_regex as $key => $val)

+		{

+			$str = preg_replace("#".$key."#i", $val, $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 = str_replace(array('<?php', '<?PHP'),  array('&lt;?php', '&lt;?PHP'), $str);

+		}

+		else

+		{

+			$str = str_replace(array('<?php', '<?PHP', '<?', '?'.'>'),  array('&lt;?php', '&lt;?PHP', '&lt;?', '?&gt;'), $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', 'script', 'applet', 'alert', 'document', 'write', 'cookie', 'window');

+		foreach ($words as $word)

+		{

+			$temp = '';

+

+			for ($i = 0, $wordlen = strlen($word); $i < $wordlen; $i++)

+			{

+				$temp .= substr($word, $i, 1)."\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"

+			$str = preg_replace_callback('#('.substr($temp, 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 for PHP5, but it is dog slow compared

+		* to these simplified non-capturing preg_match(), especially if the pattern exists in the string

+		*/

+		do

+		{

+			$original = $str;

+

+			if (preg_match("/<a/i", $str))

+			{

+				$str = preg_replace_callback("#<a\s+([^>]*?)(>|$)#si", array($this, '_js_link_removal'), $str);

+			}

+

+			if (preg_match("/<img/i", $str))

+			{

+				$str = preg_replace_callback("#<img\s+([^>]*?)(\s?/?>|$)#si", array($this, '_js_img_removal'), $str);

+			}

+

+			if (preg_match("/script/i", $str) OR preg_match("/xss/i", $str))

+			{

+				$str = preg_replace("#<(/*)(script|xss)(.*?)\>#si", '[removed]', $str);

+			}

+		}

+		while($original != $str);

+

+		unset($original);

+

+		/*

+		* Remove JavaScript Event Handlers

+		*

+		* Note: This code is a little blunt.  It removes

+		* the event handler and anything up to the closing >,

+		* but it's unlikely to be a problem.

+		*

+		*/

+		$event_handlers = array('[^a-z_\-]on\w*','xmlns');

+

+		if ($is_image === TRUE)

+		{

+			/*

+			* Adobe Photoshop puts XML metadata into JFIF images, including namespacing, 

+			* so we have to allow this for images. -Paul

+			*/

+			unset($event_handlers[array_search('xmlns', $event_handlers)]);

+		}

+

+		$str = preg_replace("#<([^><]+?)(".implode('|', $event_handlers).")(\s*=\s*[^><]*)([><]*)#i", "<\\1\\4", $str);

+

+		/*

+		* 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: &lt;blink&gt;

+		*

+		*/

+		$naughty = 'alert|applet|audio|basefont|base|behavior|bgsound|blink|body|embed|expression|form|frameset|frame|head|html|ilayer|iframe|input|isindex|layer|link|meta|object|plaintext|style|script|textarea|title|video|xml|xss';

+		$str = preg_replace_callback('#<(/*\s*)('.$naughty.')([^><]*)([><]*)#is', array($this, '_sanitize_naughty_html'), $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&#40;'some code'&#41;

+		*

+		*/

+		$str = preg_replace('#(alert|cmd|passthru|eval|exec|expression|system|fopen|fsockopen|file|file_get_contents|readfile|unlink)(\s*)\((.*?)\)#si', "\\1\\2&#40;\\3&#41;", $str);

+

+		/*

+		* Final clean up

+		*

+		* This adds a bit of extra precaution in case

+		* something got through the above filters

+		*

+		*/

+		foreach ($this->never_allowed_str as $key => $val)

+		{

+			$str = str_replace($key, $val, $str);   

+		}

+

+		foreach ($this->never_allowed_regex as $key => $val)

+		{

+			$str = preg_replace("#".$key."#i", $val, $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)

+		{

+			if ($str == $converted_string)

+			{

+				return TRUE;

+			}

+			else

+			{

+				return FALSE;

+			}

+		}

+

+		log_message('debug', "XSS Filtering completed");

+		return $str;

+	}

+

+	// --------------------------------------------------------------------

+

+	/**

+	* Random Hash for protecting URLs

+	*

+	* @access	public

+	* @return	string

+	*/

+	function xss_hash()

+	{

+		if ($this->xss_hash == '')

+		{

+			if (phpversion() >= 4.2)

+				mt_srand();

+			else

+				mt_srand(hexdec(substr(md5(microtime()), -8)) & 0x7fffffff);

+

+			$this->xss_hash = md5(time() + mt_rand(0, 1999999999));

+		}

+

+		return $this->xss_hash;

+	}

+

+	// --------------------------------------------------------------------

+

+	/**

+	* Remove Invisible Characters

+	*

+	* This prevents sandwiching null characters

+	* between ascii characters, like Java\0script.

+	*

+	* @access	public

+	* @param	string

+	* @return	string

+	*/

+	function _remove_invisible_characters($str)

+	{

+		static $non_displayables;

+

+		if ( ! isset($non_displayables))

+		{

+			// every control character except newline (dec 10), carriage return (dec 13), and horizontal tab (dec 09),

+			$non_displayables = array(

+										'/%0[0-8bcef]/',			// url encoded 00-08, 11, 12, 14, 15

+										'/%1[0-9a-f]/',				// url encoded 16-31

+										'/[\x00-\x08]/',			// 00-08

+										'/\x0b/', '/\x0c/',			// 11, 12

+										'/[\x0e-\x1f]/'				// 14-31

+									);

+		}

+

+		do

+		{

+			$cleaned = $str;

+			$str = preg_replace($non_displayables, '', $str);

+		}

+		while ($cleaned != $str);

+

+		return $str;

+	}

+

+	// --------------------------------------------------------------------

+

+	/**

+	* Compact Exploded Words

+	*

+	* Callback function for xss_clean() to remove whitespace from

+	* things like j a v a s c r i p t

+	*

+	* @access	public

+	* @param	type

+	* @return	type

+	*/

+	function _compact_exploded_words($matches)

+	{

+		return preg_replace('/\s+/s', '', $matches[1]).$matches[2];

+	}

+

+	// --------------------------------------------------------------------

+

+	/**

+	* Sanitize Naughty HTML

+	*

+	* Callback function for xss_clean() to remove naughty HTML elements

+	*

+	* @access	private

+	* @param	array

+	* @return	string

+	*/

+	function _sanitize_naughty_html($matches)

+	{

+		// encode opening brace

+		$str = '&lt;'.$matches[1].$matches[2].$matches[3];

+

+		// encode captured opening or closing brace to prevent recursive vectors

+		$str .= str_replace(array('>', '<'), array('&gt;', '&lt;'), $matches[4]);

+

+		return $str;

+	}

+

+	// --------------------------------------------------------------------

+

+	/**

+	* JS Link Removal

+	*

+	* Callback function 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

+	*

+	* @access	private

+	* @param	array

+	* @return	string

+	*/

+	function _js_link_removal($match)

+	{

+		$attributes = $this->_filter_attributes(str_replace(array('<', '>'), '', $match[1]));

+		return str_replace($match[1], preg_replace("#href=.*?(alert\(|alert&\#40;|javascript\:|charset\=|window\.|document\.|\.cookie|<script|<xss|base64\s*,)#si", "", $attributes), $match[0]);

+	}

+

+	/**

+	* JS Image Removal

+	*

+	* Callback function 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

+	*

+	* @access	private

+	* @param	array

+	* @return	string

+	*/

+	function _js_img_removal($match)

+	{

+		$attributes = $this->_filter_attributes(str_replace(array('<', '>'), '', $match[1]));

+		return str_replace($match[1], preg_replace("#src=.*?(alert\(|alert&\#40;|javascript\:|charset\=|window\.|document\.|\.cookie|<script|<xss|base64\s*,)#si", "", $attributes), $match[0]);

+	}

+

+	// --------------------------------------------------------------------

+

+	/**

+	* Attribute Conversion

+	*

+	* Used as a callback for XSS Clean

+	*

+	* @access	public

+	* @param	array

+	* @return	string

+	*/

+	function _convert_attribute($match)

+	{

+		return str_replace(array('>', '<'), array('&gt;', '&lt;'), $match[0]);

+	}

+

+	// --------------------------------------------------------------------

+

+	/**

+	* HTML Entity Decode Callback

+	*

+	* Used as a callback for XSS Clean

+	*

+	* @access	public

+	* @param	array

+	* @return	string

+	*/

+	function _html_entity_decode_callback($match)

+	{

+		$CFG =& load_class('Config');

+		$charset = $CFG->item('charset');

+

+		return $this->_html_entity_decode($match[0], strtoupper($charset));

+	}

+

+	// --------------------------------------------------------------------

+

+	/**

+	* HTML Entities Decode

+	*

+	* This function is a replacement for html_entity_decode()

+	*

+	* In some versions of PHP the native function does not work

+	* when UTF-8 is the specified character set, so this gives us

+	* a work-around.  More info here:

+	* http://bugs.php.net/bug.php?id=25670

+	*

+	* @access	private

+	* @param	string

+	* @param	string

+	* @return	string

+	*/

+	/* -------------------------------------------------

+	/*  Replacement for html_entity_decode()

+	/* -------------------------------------------------*/

+

+	/*

+	NOTE: html_entity_decode() has a bug in some PHP versions when UTF-8 is the

+	character set, and the PHP developers said they were not back porting the

+	fix to versions other than PHP 5.x.

+	*/

+	function _html_entity_decode($str, $charset='UTF-8')

+	{

+		if (stristr($str, '&') === FALSE) return $str;

+

+		// 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.

+

+		if (function_exists('html_entity_decode') && (strtolower($charset) != 'utf-8' OR version_compare(phpversion(), '5.0.0', '>=')))

+		{

+			$str = html_entity_decode($str, ENT_COMPAT, $charset);

+			$str = preg_replace('~&#x(0*[0-9a-f]{2,5})~ei', 'chr(hexdec("\\1"))', $str);

+			return preg_replace('~&#([0-9]{2,4})~e', 'chr(\\1)', $str);

+		}

+

+		// Numeric Entities

+		$str = preg_replace('~&#x(0*[0-9a-f]{2,5});{0,1}~ei', 'chr(hexdec("\\1"))', $str);

+		$str = preg_replace('~&#([0-9]{2,4});{0,1}~e', 'chr(\\1)', $str);

+

+		// Literal Entities - Slightly slow so we do another check

+		if (stristr($str, '&') === FALSE)

+		{

+			$str = strtr($str, array_flip(get_html_translation_table(HTML_ENTITIES)));

+		}

+

+		return $str;

+	}

+

+	// --------------------------------------------------------------------

+

+	/**

+	* Filter Attributes

+	*

+	* Filters tag attributes for consistency and safety

+	*

+	* @access	public

+	* @param	string

+	* @return	string

+	*/

+	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)

+			{

+				$out .= "{$match}";

+			}

+		}

+

+		return $out;

+	}

+

+	// --------------------------------------------------------------------

+

+}

+// END Input class

+

+/* End of file Input.php */

 /* Location: ./system/libraries/Input.php */
\ No newline at end of file