[php] <?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 * 當前用戶的ip地址 * @var string */ var $ip_address = FALSE; /** * user agent (web browser) being used by the current user * 當前用戶（web浏覽器）代理 * @var string */ var $user_agent = FALSE; /** * If FALSE, then $_GET will be set to an empty array * 如果是FALSE ， $_GET將被設置為空數組 * @var bool */ var $_allow_get_array = TRUE; /** * If TRUE, then newlines are standardized * 如果為TRUR，新行將被標准化 * * @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 * 決定是否總是在GET ,POST , COOKIE數據中進行XSS過濾 * 在配置選項裡面配置是否自動開啟 * * @var bool */ var $_enable_xss = FALSE; /** * Enables a CSRF cookie token to be set. * Set automatically based on config setting * 允許CSRF cookie令牌 * * @var bool */ var $_enable_csrf = FALSE; /** * List of all HTTP request headers * HTTP請求頭部的列表 * @var array */ protected $headers = array(); /** * Constructor * 設置是否全局允許XSS處理和是否允許使用$_GET數組 * Sets whether to globally enable the XSS processing * and whether to allow the $_GET array * * @return void */ public function __construct() { log_message('debug', "Input Class Initialized"); // 從配置文件中獲取是否進行全局允許使用$_GET XSS過濾和csrf保護 $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); // 清除globals變量，在開啟了globals_register的情況下，相當於關閉了此配置。 // 開啟一道 安全防護 global $SEC; $this->security =& $SEC; // Do we need the UTF-8 class? if (UTF8_ENABLED === TRUE) { global $UNI; $this->uni =& $UNI; } // Sanitize global arrays $this->_sanitize_globals(); } // -------------------------------------------------------------------- /** * Fetch from array * 從$array獲取值，如果設置了xss_clean 那麼進行過濾 * This is a helper function to retrieve 檢索 values from global arrays * 這是一個幫助函數用來從全局數組中檢索 * * @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 * 獲取過濾後的GET數組 * @access public * @param string * @param bool * @return string */ function get($index = NULL, $xss_clean = FALSE) { // Check if a field has been provided // 檢查是否一個字段已經被提供 if ($index === NULL AND ! emptyempty($_GET)) { $get = array(); // loop through the full _GET array // 遍歷_GET數組 foreach (array_keys($_GET) as $key) { $get[$key] = $this->_fetch_from_array($_GET, $key, $xss_clean); } return $get; } return $this->_fetch_from_array($_GET, $index, $xss_clean); } // -------------------------------------------------------------------- /** * Fetch an item from the POST array * 獲取過濾後的$_POST值 * @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 ! emptyempty($_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, $xss_clean); } // -------------------------------------------------------------------- /** * Fetch an item from either the GET array or the POST * 從get和post中獲取值， post優先 * @access public * @param string The index key * @param bool XSS cleaning * @return string */ function get_post($index = '', $xss_clean = FALSE) { if ( ! isset($_POST[$index]) ) { return $this->get($index, $xss_clean); } else { return $this->post($index, $xss_clean); } } // -------------------------------------------------------------------- /** * Fetch an item from the COOKIE array * 返回過濾後的COOKIE值 * @access public * @param string * @param bool * @return string */ function cookie($index = '', $xss_clean = FALSE) { return $this->_fetch_from_array($_COOKIE, $index, $xss_clean); } // ------------------------------------------------------------------------ /** * Set cookie * * Accepts six parameter, or you can submit an associative * array in the first parameter containing all the values. * 接收6個參數或者接收一個關聯數組裡面包含所有的值 * @access public * @param mixed * @param string the value of the cookie * @param string the number of seconds until expiration * @param string the cookie domain. Usually: .yourdomain.com * @param string the cookie path * @param string the cookie prefix * @param bool true makes the cookie secure * @return void */ function set_cookie($name = '', $value = '', $expire = '', $domain = '', $path = '/', $prefix = '', $secure = FALSE) { // 如果第一個值是數組 將數組中的值分別賦值給留個參數 if (is_array($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]; } } } // 如果某個參數為默認值但是config.php中的配置不是默認值 // 則使用config.php中的配置值 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, $secure); } // -------------------------------------------------------------------- /** * Fetch an item from the SERVER array * 返回過濾後的$_SERVER值 * @access public * @param string * @param bool * @return string */ function server($index = '', $xss_clean = FALSE) { return $this->_fetch_from_array($_SERVER, $index, $xss_clean); } // -------------------------------------------------------------------- /** * Fetch the IP Address * 返回當前用戶的IP。如果IP地址無效，返回0.0.0.0的IP： * @return string */ public function ip_address() { // 如果已經有了ip_address 則返回 if ($this->ip_address !== FALSE) { return $this->ip_address; } $proxy_ips = config_item('proxy_ips'); if ( ! emptyempty($proxy_ips)) { $proxy_ips = explode(',', str_replace(' ', '', $proxy_ips)); foreach (array('HTTP_X_FORWARDED_FOR', 'HTTP_CLIENT_IP', 'HTTP_X_CLIENT_IP', 'HTTP_X_CLUSTER_CLIENT_IP') as $header) { if (($spoof = $this->server($header)) !== FALSE) { // Some proxies typically list the whole chain of IP // addresses through which the client has reached us. // e.g. client_ip, proxy_ip1, proxy_ip2, etc. if (strpos($spoof, ',') !== FALSE) { $spoof = explode(',', $spoof, 2); $spoof = $spoof[0]; } if ( ! $this->valid_ip($spoof)) { $spoof = FALSE; } else { break; } } } $this->ip_address = ($spoof !== FALSE && in_array($_SERVER['REMOTE_ADDR'], $proxy_ips, TRUE)) ? $spoof : $_SERVER['REMOTE_ADDR']; } else { $this->ip_address = $_SERVER['REMOTE_ADDR']; } if ( ! $this->valid_ip($this->ip_address)) { $this->ip_address = '0.0.0.0'; } return $this->ip_address; } // -------------------------------------------------------------------- /** * Validate IP Address * 測試輸入的IP地址是不是有效，返回布爾值TRUE或者FALSE。 * 注意：$this->input->ip_address()自動測試輸入的IP地址本身格式是不是有效。 * @access public * @param string * @param string ipv4 or ipv6 * @return bool */ public function valid_ip($ip, $which = '') { $which = strtolower($which); // First check if filter_var is available if (is_callable('filter_var')) { switch ($which) { case 'ipv4': $flag = FILTER_FLAG_IPV4; break; case 'ipv6': $flag = FILTER_FLAG_IPV6; break; default: $flag = ''; break; } return (bool) filter_var($ip, FILTER_VALIDATE_IP, $flag); } if ($which !== 'ipv6' && $which !== 'ipv4') { if (strpos($ip, ':') !== FALSE) { $which = 'ipv6'; } elseif (strpos($ip, '.') !== FALSE) { $which = 'ipv4'; } else { return FALSE; } } $func = '_valid_'.$which; return $this->$func($ip); } // -------------------------------------------------------------------- /** * Validate IPv4 Address * 驗證ipv4地址 * Updated version suggested by Geert De Deckere * * @access protected * @param string * @return bool */ protected function _valid_ipv4($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; } // -------------------------------------------------------------------- /** * Validate IPv6 Address * 驗證ipv6地址 * @access protected * @param string * @return bool */ protected function _valid_ipv6($str) { // 8 groups, separated by : // 0-ffff per group // one set of consecutive 0 groups can be collapsed to :: $groups = 8; $collapsed = FALSE; $chunks = array_filter( preg_split('/(:{1,2})/', $str, NULL, PREG_SPLIT_DELIM_CAPTURE) ); // Rule out easy nonsense if (current($chunks) == ':' OR end($chunks) == ':') { return FALSE; } // PHP supports IPv4-mapped IPv6 addresses, so we'll expect those as well if (strpos(end($chunks), '.') !== FALSE) { $ipv4 = array_pop($chunks); if ( ! $this->_valid_ipv4($ipv4)) { return FALSE; } $groups--; } while ($seg = array_pop($chunks)) { if ($seg[0] == ':') { if (--$groups == 0) { return FALSE; // too many groups } if (strlen($seg) > 2) { return FALSE; // long separator } if ($seg == '::') { if ($collapsed) { return FALSE; // multiple collapsed } $collapsed = TRUE; } } elseif (preg_match("/[^0-9a-f]/i", $seg) OR strlen($seg) > 4) { return FALSE; // invalid segment } } return $collapsed OR $groups == 1; } // -------------------------------------------------------------------- /** * User Agent * 返回當前用戶正在使用的浏覽器的user agent信息。 如果不能得到數據，返回FALSE。 * 一般user_agent為空的時候被認定為手機訪問，或者curl的抓取，或則會蜘蛛抓取 * @access public * @return string */ function user_agent() { if ($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 * 清理全局數組 * This function does the following: * 這個函數做了下面的操作： * Unsets $_GET data (if query strings are not enabled) * 銷毀$_GET （如果query strings 沒有開啟） * Unsets all globals if register_globals is enabled * 銷毀所有全局數組如果register_globals開啟 * * Standardizes newline characters to \n * 標准化換行符\n * @access private * @return void */ function _sanitize_globals() { // It would be "wrong" to unset any of these GLOBALS. // 銷毀下面的全局數組將是錯誤的。 $protected = array('_SERVER', '_GET', '_POST', '_FILES', '_REQUEST', '_SESSION', '_ENV', 'GLOBALS', 'HTTP_RAW_POST_DATA', 'system_folder', 'application_folder', 'BM', 'EXT', 'CFG', 'URI', 'RTR', 'OUT', 'IN'); // Unset globals for securiy.為了安全銷毀除了上面之外的全局數組 // This is effectively the same as register_globals = off // 這樣的效果和register_globals是相同的 // 經過下面處理後，所有的非保護的全局變量將被刪除掉 foreach (array($_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 $_GET to an empty array // 是否允許$_GET數據？ 如果不允許的話，設置$_GET為空數組 if ($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 $_POST Data // 過濾$_POST 數組 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 $_COOKIE Data // 過濾$_COOKIE數組 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 on HTTP requests // ＣＳＲＦ保護檢測http請求 if ($this->_enable_csrf == TRUE && ! $this->is_cli_request()) { $this->security->csrf_verify(); } log_message('debug', "Global POST and COOKIE data sanitized"); } // -------------------------------------------------------------------- /** * Clean Input Data * 過濾input數據 * This is a helper function. It escapes data and * standardizes newline characters to \n * * @access private * @param string * @return string */ function _clean_input_data($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 如果小於PHP5.4版本，並且get_magic_quotes_gpc開啟了，則去掉斜線。 NOTE: In PHP 5.4 get_magic_quotes_gpc() will always return 0 and it will probably not exist in future versions at all。 注意：在PHP5.4及之後版本，get_magic_quotes_gpc()將總是返回0， 在後續版本中可能會移除該特性 */ if ( ! is_php('5.4') && get_magic_quotes_gpc()) { $str = stripslashes($str); } // Clean UTF-8 if supported 如果支持清理utf8 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 $str; } // -------------------------------------------------------------------- /** * Clean Keys * 過濾鍵值 * This is a helper function. To prevent malicious users * from trying to exploit keys we make sure that keys are * only named with alpha-numeric text and a few other items. * * @access private * @param string * @return string */ function _clean_input_keys($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 $str; } // -------------------------------------------------------------------- /** * Request Headers * 返回請求頭（header）數組。 * In Apache, you can simply call apache_request_headers(), however for * people running other webservers the function is undefined. * * @param bool XSS cleaning * * @return array */ public function request_headers($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 * 返回請求頭（request header）數組中某一個元素的值 * 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, $xss_clean = FALSE) { if (emptyempty($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? * 判斷是否為ajax請求 * 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? * 判斷是否來自cli請求 * Test to see if a request was made from the command line * * @return bool */ public function is_cli_request() { return (php_sapi_name() === 'cli' OR defined('STDIN')); } } /* End of file Input.php */ /* Location: ./system/core/Input.php */
