<?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 { /** * IP address of the current user * * @var string */ var $ip_address = FALSE; /** * user agent (web browser) being used by the current user * * @var string */ var $user_agent = FALSE; /** * If FALSE, then $_GET will be set to an empty array * * @var bool */ var $_allow_get_array = TRUE; /** * If TRUE, then newlines are standardized * * @var bool */ var $_standardize_newlines = TRUE; /** * Determines whether the XSS filter is always active when GET, POST or COOKIE data is encountered * Set automatically based on config setting * * @var bool */ var $_enable_xss = FALSE; /** * Enables a CSRF cookie token to be set. * Set automatically based on config setting * * @var bool */ var $_enable_csrf = FALSE; /** * List of all HTTP request headers * * @var array */ 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); global $SEC; $this->security =& $SEC; // 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) { return $this->security->xss_clean($array[$index]); } return $array[$index]; } // -------------------------------------------------------------------- /** * Fetch an item from the GET array * * @access public * @param string * @param bool * @return string */ function get($index = NULL, $xss_clean = FALSE) { // Check if a field has been provided if ($index === NULL AND ! empty($_GET)) { $get = array(); // loop through the full _GET array foreach (array_keys($_GET) as $key) { $get[$key] = $this->_fetch_from_array($_GET, $key, $xss_clean); } return $get; } 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 = NULL, $xss_clean = FALSE) { // Check if a field has been provided if ($index === NULL AND ! empty($_POST)) { $post = array(); // Loop through the full _POST array and return it foreach (array_keys($_POST) as $key) { $post[$key] = $this->_fetch_from_array($_POST, $key, $xss_clean); } return $post; } 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, $xss_clean); } // ------------------------------------------------------------------------ /** * Set cookie * * Accepts six parameter, or you can submit an associative * array in the first parameter containing all the values. * * @access public * @param mixed * @param string the value of the cookie * @param string the number of seconds until expiration * @param string the cookie domain. Usually: .yourdomain.com * @param string the cookie path * @param string the cookie prefix * @param bool true makes the cookie secure * @return void */ function set_cookie($name = '', $value = '', $expire = '', $domain = '', $path = '/', $prefix = '', $secure = FALSE) { if (is_array($name)) { // always leave 'name' in last place, as the loop will break otherwise, due to $$item foreach (array('value', 'expire', 'domain', 'path', 'prefix', 'secure', 'name') as $item) { if (isset($name[$item])) { $$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') != '/') { $path = config_item('cookie_path'); } if ($secure == FALSE AND config_item('cookie_secure') != FALSE) { $secure = config_item('cookie_secure'); } if ( ! is_numeric($expire)) { $expire = time() - 86500; } else { $expire = ($expire > 0) ? time() + $expire : 0; } setcookie($prefix.$name, $value, $expire, $path, $domain, $secure); } // -------------------------------------------------------------------- /** * Fetch an item from the SERVER array * * @access public * @param string * @param bool * @return string */ function server($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); } // Remove control characters $str = remove_invisible_characters($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", "\r\n\n"), 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 $str; } // -------------------------------------------------------------------- /** * Request Headers * * In Apache, you can simply call apache_request_headers(), however for * people running other webservers the function is undefined. * * @param bool XSS cleaning * * @return array */ public function request_headers($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) { return $this->security->xss_clean($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 (php_sapi_name() == 'cli') or defined('STDIN'); } } // END Input class /* End of file Input.php */ /* Location: ./system/core/Input.php */