update to CI 2.0

Signed-off-by: Florian Pritz <bluewind@server-speed.net>

1 files changed, 652 insertions, 0 deletions

diff --git a/system/core/Input.php b/system/core/Input.php
new file mode 100755
index 000000000..3e82874fd
--- /dev/null
+++ b/system/core/Input.php
@@ -0,0 +1,652 @@
+<?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
+ */
+
+// ------------------------------------------------------------------------
+
+/**
+ * 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 $ip_address				= FALSE;
+	var $user_agent				= FALSE;
+	var $_allow_get_array		= TRUE;
+	var $_standardize_newlines	= TRUE;
+	var $_enable_xss			= FALSE; // Set automatically based on config setting
+	var $_enable_csrf			= FALSE; // Set automatically based on config setting
+
+	protected $headers			= array();
+	
+
+	/**
+	 * Constructor
+	 *
+	 * Sets whether to globally enable the XSS processing
+	 * and whether to allow the $_GET array
+	 *
+	 */
+	public function __construct()
+	{
+		log_message('debug', "Input Class Initialized");
+
+		$this->_allow_get_array	= (config_item('allow_get_array') === TRUE);
+		$this->_enable_xss		= (config_item('global_xss_filtering') === TRUE);
+		$this->_enable_csrf		= (config_item('csrf_protection') === TRUE);
+
+		// Do we need to load the security class?
+		if ($this->_enable_xss == TRUE OR $this->_enable_csrf == TRUE)
+		{
+			$this->security =& load_class('Security');
+		}
+
+		// Do we need the UTF-8 class?
+		if (UTF8_ENABLED === TRUE)
+		{
+			global $UNI;
+			$this->uni =& $UNI;
+		}
+
+		// Sanitize global arrays
+		$this->_sanitize_globals();
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Fetch from array
+	 *
+	 * This is a helper function to retrieve values from global arrays
+	 *
+	 * @access	private
+	 * @param	array
+	 * @param	string
+	 * @param	bool
+	 * @return	string
+	 */
+	function _fetch_from_array(&$array, $index = '', $xss_clean = FALSE)
+	{
+		if ( ! isset($array[$index]))
+		{
+			return FALSE;
+		}
+
+		if ($xss_clean === TRUE)
+		{
+			$_security =& load_class('Security');
+			return $_security->xss_clean($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, $xss_clean);
+	}
+
+	// ------------------------------------------------------------------------
+
+	/**
+	* Set cookie
+	*
+	* Accepts six parameter, or you can submit an associative
+	* array in the first parameter containing all the values.
+	*
+	* @access	public
+	* @param	mixed
+	* @param	string	the value of the cookie
+	* @param	string	the number of seconds until expiration
+	* @param	string	the cookie domain.  Usually:  .yourdomain.com
+	* @param	string	the cookie path
+	* @param	string	the cookie prefix
+	* @return	void
+	*/
+	function set_cookie($name = '', $value = '', $expire = '', $domain = '', $path = '/', $prefix = '')
+	{
+		if (is_array($name))
+		{
+			foreach (array('value', 'expire', 'domain', 'path', 'prefix', 'name') as $item)
+			{
+				if (isset($name[$item]))
+				{
+					$$item = $name[$item];
+				}
+			}
+		}
+
+		if ($prefix == '' AND config_item('cookie_prefix') != '')
+		{
+			$prefix = config_item('cookie_prefix');
+		}
+		if ($domain == '' AND config_item('cookie_domain') != '')
+		{
+			$domain = config_item('cookie_domain');
+		}
+		if ($path == '/' AND config_item('cookie_path') != '/')
+		{
+			$path = config_item('cookie_path');
+		}
+
+		if ( ! is_numeric($expire))
+		{
+			$expire = time() - 86500;
+		}
+		else
+		{
+			$expire = ($expire > 0) ? time() + $expire : 0;
+		}
+
+		setcookie($prefix.$name, $value, $expire, $path, $domain, 0);
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	* 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 (config_item('proxy_ips') != '' && $this->server('HTTP_X_FORWARDED_FOR') && $this->server('REMOTE_ADDR'))
+		{
+			$proxies = preg_split('/[\s,]/', config_item('proxy_ips'), -1, PREG_SPLIT_NO_EMPTY);
+			$proxies = is_array($proxies) ? $proxies : array($proxies);
+
+			$this->ip_address = in_array($_SERVER['REMOTE_ADDR'], $proxies) ? $_SERVER['HTTP_X_FORWARDED_FOR'] : $_SERVER['REMOTE_ADDR'];
+		}
+		elseif ($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 (strpos($this->ip_address, ',') !== FALSE)
+		{
+			$x = explode(',', $this->ip_address);
+			$this->ip_address = trim(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;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	* 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()
+	{
+		// It would 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 securiy.
+		// This is effectively the same as register_globals = off
+		foreach (array($_GET, $_POST, $_COOKIE) as $global)
+		{
+			if ( ! is_array($global))
+			{
+				if ( ! in_array($global, $protected))
+				{
+					global $$global;
+					$$global = NULL;
+				}
+			}
+			else
+			{
+				foreach ($global as $key => $val)
+				{
+					if ( ! in_array($key, $protected))
+					{
+						global $$key;
+						$$key = NULL;
+					}
+				}
+			}
+		}
+
+		// Is $_GET data allowed? If not we'll set the $_GET to an empty array
+		if ($this->_allow_get_array == FALSE)
+		{
+			$_GET = array();
+		}
+		else
+		{
+			if (is_array($_GET) AND count($_GET) > 0)
+			{
+				foreach($_GET as $key => $val)
+				{
+					$_GET[$this->_clean_input_keys($key)] = $this->_clean_input_data($val);
+				}
+			}
+		}
+
+		// 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($_COOKIE) > 0)
+		{
+			// Also get rid of specially treated cookies that might be set by a server
+			// or silly application, that are of no use to a CI application anyway
+			// but that when present will trip our 'Disallowed Key Characters' alarm
+			// http://www.ietf.org/rfc/rfc2109.txt
+			// note that the key names below are single quoted strings, and are not PHP variables
+			unset($_COOKIE['$Version']);
+			unset($_COOKIE['$Path']);
+			unset($_COOKIE['$Domain']);
+
+			foreach($_COOKIE as $key => $val)
+			{
+				$_COOKIE[$this->_clean_input_keys($key)] = $this->_clean_input_data($val);
+			}
+		}
+
+		// Sanitize PHP_SELF
+		$_SERVER['PHP_SELF'] = strip_tags($_SERVER['PHP_SELF']);
+
+
+		// CSRF Protection check
+		if ($this->_enable_csrf == TRUE)
+		{
+			$this->security->csrf_verify();
+		}
+
+		log_message('debug', "Global POST and COOKIE data sanitized");
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	* Clean Input Data
+	*
+	* This is a helper function. It escapes data and
+	* standardizes newline characters to \n
+	*
+	* @access	private
+	* @param	string
+	* @return	string
+	*/
+	function _clean_input_data($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 (function_exists('get_magic_quotes_gpc') AND get_magic_quotes_gpc())
+		{
+			$str = stripslashes($str);
+		}
+
+		// Clean UTF-8 if supported
+		if (UTF8_ENABLED === TRUE)
+		{
+			$str = $this->uni->clean_string($str);
+		}
+
+		// Should we filter the input data?
+		if ($this->_enable_xss === TRUE)
+		{
+			$str = $this->security->xss_clean($str);
+		}
+
+		// Standardize newlines if needed
+		if ($this->_standardize_newlines == TRUE)
+		{
+			if (strpos($str, "\r") !== FALSE)
+			{
+				$str = str_replace(array("\r\n", "\r"), PHP_EOL, $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.');
+		}
+
+		// Clean UTF-8 if supported
+		if (UTF8_ENABLED === TRUE)
+		{
+			$str = $this->uni->clean_string($str);
+		}
+
+		return $str;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Request Headers
+	 *
+	 * In Apache, you can simply call apache_request_headers(), however for 
+	 * people running other webservers the function is undefined.
+	 *
+	 * @return array
+	 */
+	public function request_headers($xss_clean = FALSE)
+	{
+		// Look at Apache go!
+		if (function_exists('apache_request_headers'))
+		{
+			$headers = apache_request_headers();
+		}
+		else
+		{
+			$headers['Content-Type'] = (isset($_SERVER['CONTENT_TYPE'])) ? $_SERVER['CONTENT_TYPE'] : @getenv('CONTENT_TYPE');
+
+			foreach ($_SERVER as $key => $val)
+			{
+				if (strncmp($key, 'HTTP_', 5) === 0)
+				{
+					$headers[substr($key, 5)] = $this->_fetch_from_array($_SERVER, $key, $xss_clean);
+				}
+			}
+		}
+
+		// take SOME_HEADER and turn it into Some-Header
+		foreach ($headers as $key => $val)
+		{
+			$key = str_replace('_', ' ', strtolower($key));
+			$key = str_replace(' ', '-', ucwords($key));
+			
+			$this->headers[$key] = $val;
+		}
+		
+		return $this->headers;
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Get Request Header
+	 *
+	 * Returns the value of a single member of the headers class member
+	 *
+	 * @param 	string		array key for $this->headers
+	 * @param	boolean		XSS Clean or not
+	 * @return 	mixed		FALSE on failure, string on success
+	 */
+	public function get_request_header($index, $xss_clean = FALSE)
+	{
+		if (empty($this->headers))
+		{
+			$this->request_headers();
+		}
+		
+		if ( ! isset($this->headers[$index]))
+		{
+			return FALSE;
+		}
+
+		if ($xss_clean === TRUE)
+		{
+			$_security =& load_class('Security');
+			return $_security->xss_clean($this->headers[$index]);
+		}
+
+		return $this->headers[$index];		
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Is ajax Request?
+	 *
+	 * Test to see if a request contains the HTTP_X_REQUESTED_WITH header
+	 *
+	 * @return 	boolean
+	 */
+	public function is_ajax_request()
+	{
+		return ($this->server('HTTP_X_REQUESTED_WITH') === 'XMLHttpRequest');
+	}
+
+	// --------------------------------------------------------------------
+
+	/**
+	 * Is cli Request?
+	 *
+	 * Test to see if a request was made from the command line
+	 *
+	 * @return 	boolean
+	 */
+	public function is_cli_request()
+	{
+		return (bool) defined('STDIN');
+	}
+
+}
+// END Input class
+
+/* End of file Input.php */
+/* Location: ./system/core/Input.php */
\ No newline at end of file