Moving security to core.

1 files changed, 0 insertions, 820 deletions

diff --git a/system/libraries/Security.php b/system/libraries/Security.php
deleted file mode 100644
index ceef9779c..000000000
--- a/system/libraries/Security.php
+++ /dev/null
@@ -1,820 +0,0 @@
-<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
-/**
- * CodeIgniter
- *
- * An open source application development framework for PHP 5.1.6 or newer
- *
- * @package		CodeIgniter
- * @author		ExpressionEngine Dev Team
- * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.
- * @license		http://codeigniter.com/user_guide/license.html
- * @link		http://codeigniter.com
- * @since		Version 1.0
- * @filesource
- */
-
-// ------------------------------------------------------------------------
-
-/**
- * Security Class
- *
- * @package		CodeIgniter
- * @subpackage	Libraries
- * @category	Security
- * @author		ExpressionEngine Dev Team
- * @link		http://codeigniter.com/user_guide/libraries/security.html
- */
-class CI_Security {
-	
-	protected $_xss_hash			= '';
-	protected $_csrf_hash			= '';
-	protected $_csrf_expire			= 7200;  // Two hours (in seconds)
-	protected $_csrf_token_name		= 'ci_csrf_token';
-	protected $_csrf_cookie_name	= 'ci_csrf_token';
-
-	/* never allowed, string replacement */
-	protected $_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 */
-	protected $_never_allowed_regex = array(
-					"javascript\s*:"			=> '[removed]',
-					"expression\s*(\(|&\#40;)"	=> '[removed]', // CSS and IE
-					"vbscript\s*:"				=> '[removed]', // IE, surprise!
-					"Redirect\s+302"			=> '[removed]'
-	);
-	
-	/**
-	 * Constructor
-	 */
-	public function __construct()
-	{
-		// Append application specific cookie prefix to token name
-		$this->_csrf_cookie_name = (config_item('cookie_prefix')) ? config_item('cookie_prefix').$this->_csrf_token_name : $this->_csrf_token_name;
-
-		// Set the CSRF hash
-		$this->_csrf_set_hash();
-
-		log_message('debug', "Security Class Initialized");
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Verify Cross Site Request Forgery Protection
-	 *
-	 * @return	object
-	 */
-	public function csrf_verify()
-	{
-		// If no POST data exists we will set the CSRF cookie
-		if (count($_POST) == 0)
-		{
-			return $this->csrf_set_cookie();
-		}
-
-		// Do the tokens exist in both the _POST and _COOKIE arrays?
-		if ( ! isset($_POST[$this->_csrf_token_name]) OR 
-			 ! isset($_COOKIE[$this->_csrf_cookie_name]))
-		{
-			$this->csrf_show_error();
-		}
-
-		// Do the tokens match?
-		if ($_POST[$this->_csrf_token_name] != $_COOKIE[$this->_csrf_cookie_name])
-		{
-			$this->csrf_show_error();
-		}
-
-		// We kill this since we're done and we don't want to 
-		// polute the _POST array
-		unset($_POST[$this->_csrf_token_name]);
-
-		// Nothing should last forever
-		unset($_COOKIE[$this->_csrf_cookie_name]);
-		$this->_csrf_set_hash();
-		$this->csrf_set_cookie();
-
-		log_message('debug', "CSRF token verified ");
-		
-		return $this;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Set Cross Site Request Forgery Protection Cookie
-	 *
-	 * @return	object
-	 */
-	public function csrf_set_cookie()
-	{
-		$expire = time() + $this->_csrf_expire;
-		$secure_cookie = (config_item('cookie_secure') === TRUE) ? 1 : 0;
-
-		if ($secure_cookie)
-		{
-			$req = isset($_SERVER['HTTPS']) ? $_SERVER['HTTPS'] : FALSE;
-
-			if ( ! $req OR $req == 'off')
-			{
-				return FALSE;
-			}
-		}
-
-		setcookie($this->_csrf_cookie_name, $this->_csrf_hash, $expire, config_item('cookie_path'), config_item('cookie_domain'), $secure_cookie);
-
-		log_message('debug', "CRSF cookie Set");
-		
-		return $this;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Show CSRF Error
-	 *
-	 * @return	void
-	 */
-	public function csrf_show_error()
-	{
-		show_error('The action you have requested is not allowed.');
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Get CSRF Hash 
-	 *
-	 * Getter Method 
-	 *
-	 * @return 	string 	self::_csrf_hash
-	 */
-	public function get_csrf_hash()
-	{
-		return $this->_csrf_hash;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Get CSRF Token Name
-	 *
-	 * Getter Method
-	 *
-	 * @return 	string 	self::csrf_token_name
-	 */
-	public function get_csrf_token_name()
-	{
-		return $this->_csrf_token_name;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * XSS Clean
-	 *
-	 * Sanitizes data so that Cross Site Scripting Hacks can be
-	 * prevented.  This function does a fair amount of work but
-	 * it is extremely thorough, designed to prevent even the
-	 * most obscure XSS attempts.  Nothing is ever 100% foolproof,
-	 * of course, but I haven't been able to get anything passed
-	 * the filter.
-	 *
-	 * Note: This function should only be used to deal with data
-	 * upon submission.  It's not something that should
-	 * be used for general runtime processing.
-	 *
-	 * This function was based in part on some code and ideas I
-	 * got from Bitflux: http://channel.bitflux.ch/wiki/XSS_Prevention
-	 *
-	 * To help develop this script I used this great list of
-	 * vulnerabilities along with a few other hacks I've
-	 * harvested from examining vulnerabilities in other programs:
-	 * http://ha.ckers.org/xss.html
-	 *
-	 * @param	mixed	string or array
-	 * @return	string
-	 */
-	public function xss_clean($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
-		 */
-		$str = remove_invisible_characters($str);
-
-		// Validate Entities in URLs
-		$str = $this->_validate_entities($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, '_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.
-		 */
-
-		if (strpos($str, "\t") !== FALSE)
-		{
-			$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', "&lt;?\\1", $str);
-		}
-		else
-		{
-			$str = str_replace(array('<?', '?'.'>'),  array('&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 evil attributes such as style, onclick and xmlns
-		$str = $this->_remove_evil_attributes($str, $is_image);
-
-		/*
-		 * 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
-		$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) ? TRUE: FALSE;
-		}
-
-		log_message('debug', "XSS Filtering completed");
-		return $str;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Random Hash for protecting URLs
-	 *
-	 * @return	string
-	 */
-	public function xss_hash()
-	{
-		if ($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 $this->_xss_hash;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * HTML Entities Decode
-	 *
-	 * This function is a replacement for html_entity_decode()
-	 *
-	 * In some versions of PHP the native function does not work
-	 * when UTF-8 is the specified character set, so this gives us
-	 * a work-around.  More info here:
-	 * http://bugs.php.net/bug.php?id=25670
-	 *
-	 * NOTE: html_entity_decode() has a bug in some PHP versions when UTF-8 is the
-	 * character set, and the PHP developers said they were not back porting the
-	 * fix to versions other than PHP 5.x.
-	 *
-	 * @param	string
-	 * @param	string
-	 * @return	string
-	 */
-	public function entity_decode($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'))
-		{
-			$str = html_entity_decode($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 $str;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Filename Security
-	 *
-	 * @param	string
-	 * @return	string
-	 */
-	public function sanitize_filename($str, $relative_path = FALSE)
-	{
-		$bad = array(
-						"../",
-						"<!--",
-						"-->",
-						"<",
-						">",
-						"'",
-						'"',
-						'&',
-						'$',
-						'#',
-						'{',
-						'}',
-						'[',
-						']',
-						'=',
-						';',
-						'?',
-						"%20",
-						"%22",
-						"%3c",		// <
-						"%253c",	// <
-						"%3e",		// >
-						"%0e",		// >
-						"%28",		// (
-						"%29",		// )
-						"%2528",	// (
-						"%26",		// &
-						"%24",		// $
-						"%3f",		// ?
-						"%3b",		// ;
-						"%3d"		// =
-					);
-		
-		if ( ! $relative_path)
-		{
-			$bad[] = './';
-			$bad[] = '/';
-		}
-
-		$str = remove_invisible_characters($str, FALSE);
-		return stripslashes(str_replace($bad, '', $str));
-	}
-
-	// ----------------------------------------------------------------
-
-	/**
-	 * Compact Exploded Words
-	 *
-	 * Callback function for xss_clean() to remove whitespace from
-	 * things like j a v a s c r i p t
-	 *
-	 * @param	type
-	 * @return	type
-	 */
-	protected function _compact_exploded_words($matches)
-	{
-		return preg_replace('/\s+/s', '', $matches[1]).$matches[2];
-	}
-
-	// --------------------------------------------------------------------
-	
-	/*
-	 * Remove Evil HTML Attributes (like evenhandlers and style)
-	 *
-	 * It removes the evil attribute and either:
-	 * 	- Everything up until a space
-	 *		For example, everything between the pipes:
-	 *		<a |style=document.write('hello');alert('world');| class=link>
-	 * 	- Everything inside the quotes 
-	 *		For example, everything between the pipes:
-	 *		<a |style="document.write('hello'); alert('world');"| class="link">
-	 *
-	 * @param string $str The string to check
-	 * @param boolean $is_image TRUE if this is an image
-	 * @return string The string with the evil attributes removed
-	 */
-	protected function _remove_evil_attributes($str, $is_image)
-	{
-		// All javascript event handlers (e.g. onload, onclick, onmouseover), style, and xmlns
-		$evil_attributes = array('on\w*', 'style', 'xmlns');
-
-		if ($is_image === TRUE)
-		{
-			/*
-			 * Adobe Photoshop puts XML metadata into JFIF images, 
-			 * including namespacing, so we have to allow this for images.
-			 */
-			unset($evil_attributes[array_search('xmlns', $evil_attributes)]);
-		}
-		
-		do {
-			$str = preg_replace(
-				"#<(/?[^><]+?)([^A-Za-z\-])(".implode('|', $evil_attributes).")(\s*=\s*)([\"][^>]*?[\"]|[\'][^>]*?[\']|[^>]*?)([\s><])([><]*)#i",
-				"<$1$6",
-				$str, -1, $count
-			);
-		} while ($count);
-		
-		return $str;
-	}
-	
-	// --------------------------------------------------------------------
-
-	/**
-	 * Sanitize Naughty HTML
-	 *
-	 * Callback function for xss_clean() to remove naughty HTML elements
-	 *
-	 * @param	array
-	 * @return	string
-	 */
-	protected function _sanitize_naughty_html($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 $str;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * JS Link Removal
-	 *
-	 * Callback function for xss_clean() to sanitize links
-	 * This limits the PCRE backtracks, making it more performance friendly
-	 * and prevents PREG_BACKTRACK_LIMIT_ERROR from being triggered in
-	 * PHP 5.2+ on link-heavy strings
-	 *
-	 * @param	array
-	 * @return	string
-	 */
-	protected function _js_link_removal($match)
-	{
-		$attributes = $this->_filter_attributes(str_replace(array('<', '>'), '', $match[1]));
-		
-		return str_replace($match[1], preg_replace("#href=.*?(alert\(|alert&\#40;|javascript\:|livescript\:|mocha\:|charset\=|window\.|document\.|\.cookie|<script|<xss|base64\s*,)#si", "", $attributes), $match[0]);
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * JS Image Removal
-	 *
-	 * Callback function for xss_clean() to sanitize image tags
-	 * This limits the PCRE backtracks, making it more performance friendly
-	 * and prevents PREG_BACKTRACK_LIMIT_ERROR from being triggered in
-	 * PHP 5.2+ on image tag heavy strings
-	 *
-	 * @param	array
-	 * @return	string
-	 */
-	protected function _js_img_removal($match)
-	{
-		$attributes = $this->_filter_attributes(str_replace(array('<', '>'), '', $match[1]));
-		
-		return str_replace($match[1], preg_replace("#src=.*?(alert\(|alert&\#40;|javascript\:|livescript\:|mocha\:|charset\=|window\.|document\.|\.cookie|<script|<xss|base64\s*,)#si", "", $attributes), $match[0]);
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Attribute Conversion
-	 *
-	 * Used as a callback for XSS Clean
-	 *
-	 * @param	array
-	 * @return	string
-	 */
-	protected function _convert_attribute($match)
-	{
-		return str_replace(array('>', '<', '\\'), array('&gt;', '&lt;', '\\\\'), $match[0]);
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Filter Attributes
-	 *
-	 * Filters tag attributes for consistency and safety
-	 *
-	 * @param	string
-	 * @return	string
-	 */
-	protected function _filter_attributes($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 $out;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * HTML Entity Decode Callback
-	 *
-	 * Used as a callback for XSS Clean
-	 *
-	 * @param	array
-	 * @return	string
-	 */
-	protected function _decode_entity($match)
-	{
-		return $this->entity_decode($match[0], strtoupper(config_item('charset')));
-	}
-
-	// --------------------------------------------------------------------
-	
-	/**
-	 * Validate URL entities
-	 *
-	 * Called by xss_clean()
-	 *
-	 * @param 	string	
-	 * @return 	string
-	 */
-	protected function _validate_entities($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;\\2", $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);
-		
-		return $str;
-	}
-
-	// ----------------------------------------------------------------------
-
-	/**
-	 * Do Never Allowed
-	 *
-	 * A utility function for xss_clean()
-	 *
-	 * @param 	string
-	 * @return 	string
-	 */
-	protected function _do_never_allowed($str)
-	{
-		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);
-		}
-		
-		return $str;
-	}
-
-	// --------------------------------------------------------------------
-
-	/**
-	 * Set Cross Site Request Forgery Protection Cookie
-	 *
-	 * @return	string
-	 */
-	protected function _csrf_set_hash()
-	{
-		if ($this->_csrf_hash == '')
-		{
-			// If the cookie exists we will use it's value.  
-			// We don't necessarily want to regenerate it with
-			// each page load since a page could contain embedded 
-			// sub-pages causing this feature to fail
-			if (isset($_COOKIE[$this->_csrf_cookie_name]) && 
-				$_COOKIE[$this->_csrf_cookie_name] != '')
-			{
-				return $this->_csrf_hash = $_COOKIE[$this->_csrf_cookie_name];
-			}
-			
-			return $this->_csrf_hash = md5(uniqid(rand(), TRUE));
-		}
-
-		return $this->_csrf_hash;
-	}
-
-}
-// END Security Class
-
-/* End of file Security.php */
-/* Location: ./system/libraries/Security.php */
\ No newline at end of file