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+<?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
generated by cgit v1.2.3-24-g4f1b (git 2.32.0) at 2024-11-22 22:47:23 +0100