removed unescaped variable that could be used in XSS

1 files changed, 639 insertions, 639 deletions

diff --git a/system/libraries/Input.php b/system/libraries/Input.php
index 4fd2061c7..f346cabaa 100644
--- a/system/libraries/Input.php
+++ b/system/libraries/Input.php
@@ -1,640 +1,640 @@
-<?php  if (!defined('BASEPATH')) exit('No direct script access allowed');
-/**
- * Code Igniter
- *
- * An open source application development framework for PHP 4.3.2 or newer
- *
- * @package		CodeIgniter
- * @author		Rick Ellis
- * @copyright	Copyright (c) 2006, pMachine, Inc.
- * @license		http://www.codeignitor.com/user_guide/license.html
- * @link		http://www.codeigniter.com
- * @since		Version 1.0
- * @filesource
- */
-
-// ------------------------------------------------------------------------
-
-/**
- * Input Class
- *
- * Pre-processes global input data for security
- *
- * @package		CodeIgniter
- * @subpackage	Libraries
- * @category	Input
- * @author		Rick Ellis
- * @link		http://www.codeigniter.com/user_guide/libraries/input.html
- */
-class CI_Input {
-	var $use_xss_clean		= FALSE;
-	var $ip_address			= FALSE;
-	var $user_agent			= FALSE;
-	var $allow_get_array	= FALSE;
-	
-	/**
-	 * 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 $_GET data (if query strings are not enabled)
-	 *
-	 * Unsets all globals if register_globals is enabled
-	 *
-	 * Standardizes newline characters to \n
-	 *
-	 * @access	private
-	 * @return	void
-	 */
-	function _sanitize_globals()
-	{
-		// Unset globals. This is effectively the same as register_globals = off
-		foreach (array($_GET, $_POST, $_COOKIE) as $global)
-		{
-			if ( ! is_array($global))
-			{
-				global $global;
-				$$global = NULL;
-			}
-			else
-			{
-				foreach ($global as $key => $val)
-				{
-					global $$key;
-					$$key = NULL;
-				}	
-			}
-		}
-
-		// Is $_GET data allowed? If not we'll set the $_GET to an empty array
-		if ($this->allow_get_array == FALSE)
-		{
-			$_GET = array();
-		}
-		
-		// Clean $_POST Data
-		if (is_array($_POST) AND count($_POST) > 0)
-		{
-			foreach($_POST as $key => $val)
-			{				
-				$_POST[$this->_clean_input_keys($key)] = $this->_clean_input_data($val);
-			}			
-		}
-	
-		// Clean $_COOKIE Data
-		if (is_array($_COOKIE) AND count($_COOKIE) > 0)
-		{
-			foreach($_COOKIE as $key => $val)
-			{			
-				$_COOKIE[$this->_clean_input_keys($key)] = $this->_clean_input_data($val);
-			}	
-		}
-		
-		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 $new_array;
-		}
-		
-		if ($this->use_xss_clean === TRUE)
-		{
-			$str = $this->xss_clean($str);
-		}
-		
-		// Standardize newlines
-		return preg_replace("/\015\012|\015|\012/", "\n", $str);
-	}
-	
-	// --------------------------------------------------------------------
-	
-	/**
-	 * Clean Keys
-	 *
-	 * This is a helper function. To prevent malicious users
-	 * from trying to exploit keys we make sure that keys are
-	 * only named with alpha-numeric text and a few other items.
-	 *
-	 * @access	private
-	 * @param	string
-	 * @return	string
-	 */
-	function _clean_input_keys($str)
-	{	
-		 if ( ! preg_match("/^[a-z0-9:_\/-]+$/i", $str))
-		 {
-			exit('Disallowed Key Characters: '.$str);
-		 }
-	
-		if ( ! get_magic_quotes_gpc())
-		{
-		   return addslashes($str);
-		}
-		
-		return $str;
-	}
-	
-	// --------------------------------------------------------------------
-	
-	/**
-	 * Fetch an item from the POST array
-	 *
-	 * @access	public
-	 * @param	string
-	 * @param	bool
-	 * @return	string
-	 */
-	function post($index = '', $xss_clean = FALSE)
-	{		
-		if ( ! isset($_POST[$index]))
-		{
-			return FALSE;
-		}
-
-		if ($xss_clean === TRUE)
-		{
-			if (is_array($_POST[$index]))
-			{
-				foreach($_POST[$index] as $key => $val)
-				{					
-					$_POST[$index][$key] = $this->xss_clean($val);
-				}
-			}
-			else
-			{
-				return $this->xss_clean($_POST[$index]);
-			}
-		}
-
-		return $_POST[$index];
-	}
-	
-	// --------------------------------------------------------------------
-	
-	/**
-	 * Fetch an item from the COOKIE array
-	 *
-	 * @access	public
-	 * @param	string
-	 * @param	bool
-	 * @return	string
-	 */
-	function cookie($index = '', $xss_clean = FALSE)
-	{
-		if ( ! isset($_COOKIE[$index]))
-		{
-			return FALSE;
-		}
-
-		if ($xss_clean === TRUE)
-		{
-			if (is_array($_COOKIE[$index]))
-			{
-				$cookie = array();
-				foreach($_COOKIE[$index] as $key => $val)
-				{
-					$cookie[$key] = $this->xss_clean($val);
-				}
-		
-				return $cookie;
-			}
-			else
-			{
-				return $this->xss_clean($_COOKIE[$index]);
-			}
-		}
-		else
-		{
-			return $_COOKIE[$index];
-		}
-	}
-
-	// --------------------------------------------------------------------
-	
-	/**
-	 * Fetch an item from the SERVER array
-	 *
-	 * @access	public
-	 * @param	string
-	 * @param	bool
-	 * @return	string
-	 */
-	function server($index = '', $xss_clean = FALSE)
-	{		
-		if ( ! isset($_SERVER[$index]))
-		{
-			return FALSE;
-		}
-
-		if ($xss_clean === TRUE)
-		{
-			return $this->xss_clean($_SERVER[$index]);
-		}
-		
-		return $_SERVER[$index];
-	}
-	
-	// --------------------------------------------------------------------
-	
-	/**
-	 * 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 $this->ip_address;
-	}
-	
-	// --------------------------------------------------------------------
-	
-	/**
-	 * Validate IP Address
-	 *
-	 * @access	public
-	 * @param	string
-	 * @return	string
-	 */
-	function valid_ip($ip)
-	{
-		return ( ! preg_match( "/^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$/", $ip)) ? FALSE : TRUE;
-	}
-	
-	// --------------------------------------------------------------------
-	
-	/**
-	 * User Agent
-	 *
-	 * @access	public
-	 * @return	string
-	 */
-	function user_agent()
-	{
-		if ($this->user_agent !== FALSE)
-		{
-			return $this->user_agent;
-		}
-	
-		$this->user_agent = ( ! isset($_SERVER['HTTP_USER_AGENT'])) ? FALSE : $_SERVER['HTTP_USER_AGENT'];
-		
-		return $this->user_agent;
-	}
-	
-	// --------------------------------------------------------------------
-	
-	/**
-	 * XSS Clean
-	 *
-	 * Sanitizes data so that Cross Site Scripting Hacks can be
-	 * prevented.  This function does a fair amount of work but
-	 * it is extremely thorough, designed to prevent even the
-	 * most obscure XSS attempts.  Nothing is ever 100% foolproof,
-	 * of course, but I haven't been able to get anything passed
-	 * the filter.
-	 *
-	 * Note: This function should only be used to deal with data
-	 * upon submission.  It's not something that should
-	 * be used for general runtime processing.
-	 *
-	 * This function was based in part on some code and ideas I
-	 * got from Bitflux: http://blog.bitflux.ch/wiki/XSS_Prevention
-	 *
-	 * To help develop this script I used this great list of
-	 * vulnerabilities along with a few other hacks I've
-	 * harvested from examining vulnerabilities in other programs:
-	 * http://ha.ckers.org/xss.html
-	 *
-	 * @access	public
-	 * @param	string
-	 * @return	string
-	 */
-	function xss_clean($str, $charset = 'ISO-8859-1')
-	{	
-		/*
-		 * Remove Null Characters
-		 *
-		 * This prevents sandwiching null characters
-		 * between ascii characters, like Java\0script.
-		 *
-		 */
-		$str = preg_replace('/\0+/', '', $str);
-		$str = preg_replace('/(\\\\0)+/', '', $str);
-
-		/*
-		 * Validate standard character entities
-		 *
-		 * Add a semicolon if missing.  We do this to enable
-		 * the conversion of entities to ASCII later.
-		 *
-		 */
-		$str = preg_replace('#(&\#*\w+)[\x00-\x20]+;#u',"\\1;",$str);
-		
-		/*
-		 * Validate UTF16 two byte encoding (x00)
-		 *
-		 * Just as above, adds a semicolon if missing.
-		 *
-		 */
-		$str = preg_replace('#(&\#x*)([0-9A-F]+);*#iu',"\\1\\2;",$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: Normally urldecode() would be easier but it removes plus signs
-		 *
-		 */	
-		$str = preg_replace("/%u0([a-z0-9]{3})/i", "&#x\\1;", $str);
-		$str = preg_replace("/%([a-z0-9]{2})/i", "&#x\\1;", $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.
-		 *
-		 */
-		if (preg_match_all("/<(.+?)>/si", $str, $matches))
-		{		
-			for ($i = 0; $i < count($matches['0']); $i++)
-			{
-				$str = str_replace($matches['1'][$i],
-									$this->_html_entity_decode($matches['1'][$i], $charset),
-									$str);
-			}
-		}
-		
-		/*
-		 * Not Allowed Under Any Conditions
-		 */	
-		$bad = array(
-						'document.cookie'	=> '[removed]',
-						'document.write'	=> '[removed]',
-						'window.location'	=> '[removed]',
-						"javascript\s*:"	=> '[removed]',
-						"Redirect\s+302"	=> '[removed]',
-						'<!--'				=> '&lt;!--',
-						'-->'				=> '--&gt;'
-					);
-	
-		foreach ($bad as $key => $val)
-		{
-			$str = preg_replace("#".$key."#i", $val, $str);   
-		}
-	
-		/*
-		 * Convert all tabs to spaces
-		 *
-		 * This prevents strings like this: ja	vascript
-		 * Note: we deal with spaces between characters later.
-		 *
-		 */		
-		$str = preg_replace("#\t+#", " ", $str);
-	
-		/*
-		 * Makes PHP tags safe
-		 *
-		 *  Note: XML tags are inadvertently replaced too:
-		 *
-		 *	<?xml
-		 *
-		 * But it doesn't seem to pose a problem.
-		 *
-		 */		
-		$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.
-		 *
-		 */		
-		$words = array('javascript', 'vbscript', 'script', 'applet', 'alert', 'document', 'write', 'cookie', 'window');
-		foreach ($words as $word)
-		{
-			$temp = '';
-			for ($i = 0; $i < strlen($word); $i++)
-			{
-				$temp .= substr($word, $i, 1)."\s*";
-			}
-			
-			$temp = substr($temp, 0, -3);
-			$str = preg_replace('#'.$temp.'#s', $word, $str);
-			$str = preg_replace('#'.ucfirst($temp).'#s', ucfirst($word), $str);
-		}
-	
-		/*
-		 * Remove disallowed Javascript in links or img tags
-		 */		
-		 $str = preg_replace("#<a.+?href=.*?(alert\(|alert&\#40;|javascript\:|window\.|document\.|\.cookie|<script|<xss).*?\>.*?</a>#si", "", $str);
-		 $str = preg_replace("#<img.+?src=.*?(alert\(|alert&\#40;|javascript\:|window\.|document\.|\.cookie|<script|<xss).*?\>#si", "", $str);
-		 $str = preg_replace("#<(script|xss).*?\>#si", "", $str);
-
-		/*
-		 * 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.
-		 *
-		 */		
-		 $str = preg_replace('#(<[^>]+.*?)(onblur|onchange|onclick|onfocus|onload|onmouseover|onmouseup|onmousedown|onselect|onsubmit|onunload|onkeypress|onkeydown|onkeyup|onresize)[^>]*>#iU',"\\1>",$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;
-		 *
-		 */		
-		$str = preg_replace('#<(/*\s*)(alert|applet|basefont|base|behavior|bgsound|blink|body|embed|expression|form|frameset|frame|head|html|ilayer|iframe|input|layer|link|meta|object|plaintext|style|script|textarea|title|xml|xss)([^>]*)>#is', "&lt;\\1\\2\\3&gt;", $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|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
-		 *
-		 */	
-		$bad = array(
-						'document.cookie'	=> '[removed]',
-						'document.write'	=> '[removed]',
-						'window.location'	=> '[removed]',
-						"javascript\s*:"	=> '[removed]',
-						"Redirect\s+302"	=> '[removed]',
-						'<!--'				=> '&lt;!--',
-						'-->'				=> '--&gt;'
-					);
-	
-		foreach ($bad as $key => $val)
-		{
-			$str = preg_replace("#".$key."#i", $val, $str);
-		}
-		
-						
-		log_message('debug', "XSS Filtering completed");
-		return $str;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * HTML Entities Decode
-	 *
-	 * This function is a replacement for html_entity_decode()
-	 *
-	 * In some versions of PHP the native function does not work
-	 * when UTF-8 is the specified character set, so this gives us
-	 * a work-around.  More info here:
-	 * http://bugs.php.net/bug.php?id=25670
-	 *
-	 * @access	private
-	 * @param	string
-	 * @param	string
-	 * @return	string
-	 */
-	/* -------------------------------------------------
-	/*  Replacement for html_entity_decode()
-	/* -------------------------------------------------*/
-	
-	/*
-	NOTE: html_entity_decode() has a bug in some PHP versions when UTF-8 is the
-	character set, and the PHP developers said they were not back porting the
-	fix to versions other than PHP 5.x.
-	*/
-	function _html_entity_decode($str, $charset='ISO-8859-1')
-	{
-		if (stristr($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([0-9a-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([0-9a-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;
-	}
-
-}
-// END Input class
+<?php  if (!defined('BASEPATH')) exit('No direct script access allowed');

+/**

+ * Code Igniter

+ *

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

+ *

+ * @package		CodeIgniter

+ * @author		Rick Ellis

+ * @copyright	Copyright (c) 2006, pMachine, Inc.

+ * @license		http://www.codeignitor.com/user_guide/license.html

+ * @link		http://www.codeigniter.com

+ * @since		Version 1.0

+ * @filesource

+ */

+

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

+

+/**

+ * Input Class

+ *

+ * Pre-processes global input data for security

+ *

+ * @package		CodeIgniter

+ * @subpackage	Libraries

+ * @category	Input

+ * @author		Rick Ellis

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

+ */

+class CI_Input {

+	var $use_xss_clean		= FALSE;

+	var $ip_address			= FALSE;

+	var $user_agent			= FALSE;

+	var $allow_get_array	= FALSE;

+	

+	/**

+	 * 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()

+	{

+		// Unset globals. This is effectively the same as register_globals = off

+		foreach (array($_GET, $_POST, $_COOKIE) as $global)

+		{

+			if ( ! is_array($global))

+			{

+				global $global;

+				$$global = NULL;

+			}

+			else

+			{

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

+				{

+					global $$key;

+					$$key = NULL;

+				}	

+			}

+		}

+

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

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

+		{

+			$_GET = array();

+		}

+		

+		// Clean $_POST Data

+		if (is_array($_POST) AND count($_POST) > 0)

+		{

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

+			{				

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

+			}			

+		}

+	

+		// Clean $_COOKIE Data

+		if (is_array($_COOKIE) AND count($_COOKIE) > 0)

+		{

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

+			{			

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

+			}	

+		}

+		

+		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;

+		}

+		

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

+		{

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

+		}

+		

+		// Standardize newlines

+		return preg_replace("/\015\012|\015|\012/", "\n", $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.');

+		 }

+	

+		if ( ! get_magic_quotes_gpc())

+		{

+		   return addslashes($str);

+		}

+		

+		return $str;

+	}

+	

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

+	

+	/**

+	 * Fetch an item from the POST array

+	 *

+	 * @access	public

+	 * @param	string

+	 * @param	bool

+	 * @return	string

+	 */

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

+	{		

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

+		{

+			return FALSE;

+		}

+

+		if ($xss_clean === TRUE)

+		{

+			if (is_array($_POST[$index]))

+			{

+				foreach($_POST[$index] as $key => $val)

+				{					

+					$_POST[$index][$key] = $this->xss_clean($val);

+				}

+			}

+			else

+			{

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

+			}

+		}

+

+		return $_POST[$index];

+	}

+	

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

+	

+	/**

+	 * Fetch an item from the COOKIE array

+	 *

+	 * @access	public

+	 * @param	string

+	 * @param	bool

+	 * @return	string

+	 */

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

+	{

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

+		{

+			return FALSE;

+		}

+

+		if ($xss_clean === TRUE)

+		{

+			if (is_array($_COOKIE[$index]))

+			{

+				$cookie = array();

+				foreach($_COOKIE[$index] as $key => $val)

+				{

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

+				}

+		

+				return $cookie;

+			}

+			else

+			{

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

+			}

+		}

+		else

+		{

+			return $_COOKIE[$index];

+		}

+	}

+

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

+	

+	/**

+	 * Fetch an item from the SERVER array

+	 *

+	 * @access	public

+	 * @param	string

+	 * @param	bool

+	 * @return	string

+	 */

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

+	{		

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

+		{

+			return FALSE;

+		}

+

+		if ($xss_clean === TRUE)

+		{

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

+		}

+		

+		return $_SERVER[$index];

+	}

+	

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

+	

+	/**

+	 * 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

+	 *

+	 * @access	public

+	 * @param	string

+	 * @return	string

+	 */

+	function valid_ip($ip)

+	{

+		return ( ! preg_match( "/^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$/", $ip)) ? FALSE : 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;

+	}

+	

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

+	

+	/**

+	 * 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, $charset = 'ISO-8859-1')

+	{	

+		/*

+		 * Remove Null Characters

+		 *

+		 * This prevents sandwiching null characters

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

+		 *

+		 */

+		$str = preg_replace('/\0+/', '', $str);

+		$str = preg_replace('/(\\\\0)+/', '', $str);

+

+		/*

+		 * Validate standard character entities

+		 *

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

+		 * the conversion of entities to ASCII later.

+		 *

+		 */

+		$str = preg_replace('#(&\#*\w+)[\x00-\x20]+;#u',"\\1;",$str);

+		

+		/*

+		 * Validate UTF16 two byte encoding (x00)

+		 *

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

+		 *

+		 */

+		$str = preg_replace('#(&\#x*)([0-9A-F]+);*#iu',"\\1\\2;",$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: Normally urldecode() would be easier but it removes plus signs

+		 *

+		 */	

+		$str = preg_replace("/%u0([a-z0-9]{3})/i", "&#x\\1;", $str);

+		$str = preg_replace("/%([a-z0-9]{2})/i", "&#x\\1;", $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.

+		 *

+		 */

+		if (preg_match_all("/<(.+?)>/si", $str, $matches))

+		{		

+			for ($i = 0; $i < count($matches['0']); $i++)

+			{

+				$str = str_replace($matches['1'][$i],

+									$this->_html_entity_decode($matches['1'][$i], $charset),

+									$str);

+			}

+		}

+		

+		/*

+		 * Not Allowed Under Any Conditions

+		 */	

+		$bad = array(

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

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

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

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

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

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

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

+					);

+	

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

+		{

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

+		}

+	

+		/*

+		 * Convert all tabs to spaces

+		 *

+		 * This prevents strings like this: ja	vascript

+		 * Note: we deal with spaces between characters later.

+		 *

+		 */		

+		$str = preg_replace("#\t+#", " ", $str);

+	

+		/*

+		 * Makes PHP tags safe

+		 *

+		 *  Note: XML tags are inadvertently replaced too:

+		 *

+		 *	<?xml

+		 *

+		 * But it doesn't seem to pose a problem.

+		 *

+		 */		

+		$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', 'vbscript', 'script', 'applet', 'alert', 'document', 'write', 'cookie', 'window');

+		foreach ($words as $word)

+		{

+			$temp = '';

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

+			{

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

+			}

+			

+			$temp = substr($temp, 0, -3);

+			$str = preg_replace('#'.$temp.'#s', $word, $str);

+			$str = preg_replace('#'.ucfirst($temp).'#s', ucfirst($word), $str);

+		}

+	

+		/*

+		 * Remove disallowed Javascript in links or img tags

+		 */		

+		 $str = preg_replace("#<a.+?href=.*?(alert\(|alert&\#40;|javascript\:|window\.|document\.|\.cookie|<script|<xss).*?\>.*?</a>#si", "", $str);

+		 $str = preg_replace("#<img.+?src=.*?(alert\(|alert&\#40;|javascript\:|window\.|document\.|\.cookie|<script|<xss).*?\>#si", "", $str);

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

+

+		/*

+		 * 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.

+		 *

+		 */		

+		 $str = preg_replace('#(<[^>]+.*?)(onblur|onchange|onclick|onfocus|onload|onmouseover|onmouseup|onmousedown|onselect|onsubmit|onunload|onkeypress|onkeydown|onkeyup|onresize)[^>]*>#iU',"\\1>",$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;

+		 *

+		 */		

+		$str = preg_replace('#<(/*\s*)(alert|applet|basefont|base|behavior|bgsound|blink|body|embed|expression|form|frameset|frame|head|html|ilayer|iframe|input|layer|link|meta|object|plaintext|style|script|textarea|title|xml|xss)([^>]*)>#is', "&lt;\\1\\2\\3&gt;", $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|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

+		 *

+		 */	

+		$bad = array(

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

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

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

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

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

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

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

+					);

+	

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

+		{

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

+		}

+		

+						

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

+		return $str;

+	}

+

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

+

+	/**

+	 * 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='ISO-8859-1')

+	{

+		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([0-9a-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([0-9a-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;

+	}

+

+}

+// END Input class

 ?>
\ No newline at end of file