diff options
Diffstat (limited to 'system/core')
| -rwxr-xr-x | system/core/CodeIgniter.php | 50 | ||||
| -rwxr-xr-x | system/core/Common.php | 44 | ||||
| -rwxr-xr-x | system/core/Config.php | 30 | ||||
| -rwxr-xr-x | system/core/Hooks.php | 10 | ||||
| -rwxr-xr-x | system/core/Input.php | 68 | ||||
| -rwxr-xr-x | system/core/Lang.php | 7 | ||||
| -rwxr-xr-x | system/core/Loader.php | 45 | ||||
| -rwxr-xr-x | system/core/Output.php | 77 | ||||
| -rwxr-xr-x | system/core/Router.php | 12 | ||||
| -rwxr-xr-x | system/core/Security.php | 820 | ||||
| -rwxr-xr-x | system/core/URI.php | 69 | ||||
| -rwxr-xr-x | system/core/Utf8.php | 2 |
12 files changed, 1127 insertions, 107 deletions
diff --git a/system/core/CodeIgniter.php b/system/core/CodeIgniter.php index 2d3f24958..e022e1b46 100755 --- a/system/core/CodeIgniter.php +++ b/system/core/CodeIgniter.php @@ -32,7 +32,14 @@ * Define the CodeIgniter Version * ------------------------------------------------------ */ - define('CI_VERSION', '2.0'); + define('CI_VERSION', '2.0.2'); + +/* + * ------------------------------------------------------ + * Define the CodeIgniter Branch (Core = TRUE, Reactor = FALSE) + * ------------------------------------------------------ + */ + define('CI_CORE', FALSE); /* * ------------------------------------------------------ @@ -46,7 +53,14 @@ * Load the framework constants * ------------------------------------------------------ */ - require(APPPATH.'config/constants'.EXT); + if (defined('ENVIRONMENT') AND file_exists(APPPATH.'config/'.ENVIRONMENT.'/constants'.EXT)) + { + require(APPPATH.'config/'.ENVIRONMENT.'/constants'.EXT); + } + else + { + require(APPPATH.'config/constants'.EXT); + } /* * ------------------------------------------------------ @@ -80,7 +94,7 @@ { get_config(array('subclass_prefix' => $assign_to_config['subclass_prefix'])); } - + /* * ------------------------------------------------------ * Set a liberal script execution time limit @@ -183,6 +197,13 @@ } /* + * ----------------------------------------------------- + * Load the security class for xss and csrf support + * ----------------------------------------------------- + */ + $SEC =& load_class('Security', 'core'); + +/* * ------------------------------------------------------ * Load the Input class and sanitize globals * ------------------------------------------------------ @@ -289,7 +310,28 @@ // methods, so we'll use this workaround for consistent behavior if ( ! in_array(strtolower($method), array_map('strtolower', get_class_methods($CI)))) { - show_404("{$class}/{$method}"); + // Check and see if we are using a 404 override and use it. + if ( ! empty($RTR->routes['404_override'])) + { + $x = explode('/', $RTR->routes['404_override']); + $class = $x[0]; + $method = (isset($x[1]) ? $x[1] : 'index'); + if ( ! class_exists($class)) + { + if ( ! file_exists(APPPATH.'controllers/'.$class.EXT)) + { + show_404("{$class}/{$method}"); + } + + include_once(APPPATH.'controllers/'.$class.EXT); + unset($CI); + $CI = new $class(); + } + } + else + { + show_404("{$class}/{$method}"); + } } // Call the requested method. diff --git a/system/core/Common.php b/system/core/Common.php index b5adfacb3..1aca809ab 100755 --- a/system/core/Common.php +++ b/system/core/Common.php @@ -88,7 +88,7 @@ @unlink($file); return TRUE; } - elseif (($fp = @fopen($file, FOPEN_WRITE_CREATE)) === FALSE) + elseif ( ! is_file($file) OR ($fp = @fopen($file, FOPEN_WRITE_CREATE)) === FALSE) { return FALSE; } @@ -208,16 +208,20 @@ return $_config[0]; } - // Fetch the config file - if ( ! file_exists(APPPATH.'config/config'.EXT)) + // Is the config file in the environment folder? + if ( ! defined('ENVIRONMENT') OR ! file_exists($file_path = APPPATH.'config/'.ENVIRONMENT.'/config'.EXT)) { - exit('The configuration file does not exist.'); + $file_path = APPPATH.'config/config'.EXT; } - else + + // Fetch the config file + if ( ! file_exists($file_path)) { - require(APPPATH.'config/config'.EXT); + exit('The configuration file does not exist.'); } + require($file_path); + // Does the $config array exist in the file? if ( ! isset($config) OR ! is_array($config)) { @@ -472,28 +476,26 @@ * @param string * @return string */ - function remove_invisible_characters($str) + function remove_invisible_characters($str, $url_encoded = TRUE) { - static $non_displayables; - - if ( ! isset($non_displayables)) + $non_displayables = array(); + + // every control character except newline (dec 10) + // carriage return (dec 13), and horizontal tab (dec 09) + + if ($url_encoded) { - // every control character except newline (dec 10), carriage return (dec 13), and horizontal tab (dec 09), - $non_displayables = array( - '/%0[0-8bcef]/', // url encoded 00-08, 11, 12, 14, 15 - '/%1[0-9a-f]/', // url encoded 16-31 - '/[\x00-\x08]/', // 00-08 - '/\x0b/', '/\x0c/', // 11, 12 - '/[\x0e-\x1f]/' // 14-31 - ); + $non_displayables[] = '/%0[0-8bcef]/'; // url encoded 00-08, 11, 12, 14, 15 + $non_displayables[] = '/%1[0-9a-f]/'; // url encoded 16-31 } + + $non_displayables[] = '/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F]+/S'; // 00-08, 11, 12, 14-31, 127 do { - $cleaned = $str; - $str = preg_replace($non_displayables, '', $str); + $str = preg_replace($non_displayables, '', $str, -1, $count); } - while ($cleaned != $str); + while ($count); return $str; } diff --git a/system/core/Config.php b/system/core/Config.php index bfb60fa44..863c5ef4b 100755 --- a/system/core/Config.php +++ b/system/core/Config.php @@ -51,7 +51,7 @@ class CI_Config { // Set the base_url automatically if none was provided if ($this->config['base_url'] == '') { - if(isset($_SERVER['HTTP_HOST'])) + if (isset($_SERVER['HTTP_HOST'])) { $base_url = isset($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) !== 'off' ? 'https' : 'http'; $base_url .= '://'. $_SERVER['HTTP_HOST']; @@ -74,24 +74,40 @@ class CI_Config { * * @access public * @param string the config file name + * @param boolean if configuration values should be loaded into their own section + * @param boolean true if errors should just return false, false if an error message should be displayed * @return boolean if the file was loaded correctly */ function load($file = '', $use_sections = FALSE, $fail_gracefully = FALSE) { $file = ($file == '') ? 'config' : str_replace(EXT, '', $file); + $found = FALSE; $loaded = FALSE; - foreach($this->_config_paths as $path) + foreach ($this->_config_paths as $path) { - $file_path = $path.'config/'.$file.EXT; + $check_locations = defined('ENVIRONMENT') + ? array(ENVIRONMENT.'/'.$file, $file) + : array($file); - if (in_array($file_path, $this->is_loaded, TRUE)) + foreach ($check_locations as $location) { - $loaded = TRUE; - continue; + $file_path = $path.'config/'.$location.EXT; + + if (in_array($file_path, $this->is_loaded, TRUE)) + { + $loaded = TRUE; + continue 2; + } + + if (file_exists($file_path)) + { + $found = TRUE; + break; + } } - if ( ! file_exists($path.'config/'.$file.EXT)) + if ($found === FALSE) { continue; } diff --git a/system/core/Hooks.php b/system/core/Hooks.php index 75fd811b0..24fa1055b 100755 --- a/system/core/Hooks.php +++ b/system/core/Hooks.php @@ -65,7 +65,15 @@ class CI_Hooks { // Grab the "hooks" definition file. // If there are no hooks, we're done. - @include(APPPATH.'config/hooks'.EXT); + if (defined('ENVIRONMENT') AND is_file(APPPATH.'config/'.ENVIRONMENT.'/hooks'.EXT)) + { + include(APPPATH.'config/'.ENVIRONMENT.'/hooks'.EXT); + } + elseif (is_file(APPPATH.'config/hooks'.EXT)) + { + include(APPPATH.'config/hooks'.EXT); + } + if ( ! isset($hook) OR ! is_array($hook)) { diff --git a/system/core/Input.php b/system/core/Input.php index 3e82874fd..dc7612e64 100755 --- a/system/core/Input.php +++ b/system/core/Input.php @@ -53,11 +53,8 @@ class CI_Input { $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'); - } + global $SEC; + $this->security =& $SEC; // Do we need the UTF-8 class? if (UTF8_ENABLED === TRUE) @@ -92,8 +89,7 @@ class CI_Input { if ($xss_clean === TRUE) { - $_security =& load_class('Security'); - return $_security->xss_clean($array[$index]); + return $this->security->xss_clean($array[$index]); } return $array[$index]; @@ -109,8 +105,21 @@ class CI_Input { * @param bool * @return string */ - function get($index = '', $xss_clean = FALSE) + function get($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, $xss_clean); } @@ -124,8 +133,21 @@ class CI_Input { * @param bool * @return string */ - function post($index = '', $xss_clean = FALSE) + function post($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, $xss_clean); } @@ -182,13 +204,15 @@ class CI_Input { * @param string the cookie domain. Usually: .yourdomain.com * @param string the cookie path * @param string the cookie prefix + * @param bool true makes the cookie secure * @return void */ - function set_cookie($name = '', $value = '', $expire = '', $domain = '', $path = '/', $prefix = '') + function set_cookie($name = '', $value = '', $expire = '', $domain = '', $path = '/', $prefix = '', $secure = FALSE) { if (is_array($name)) { - foreach (array('value', 'expire', 'domain', 'path', 'prefix', 'name') as $item) + // 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])) { @@ -209,6 +233,10 @@ class CI_Input { { $path = config_item('cookie_path'); } + if ($secure == FALSE AND config_item('cookie_secure') != FALSE) + { + $secure = config_item('cookie_secure'); + } if ( ! is_numeric($expire)) { @@ -219,7 +247,7 @@ class CI_Input { $expire = ($expire > 0) ? time() + $expire : 0; } - setcookie($prefix.$name, $value, $expire, $path, $domain, 0); + setcookie($prefix.$name, $value, $expire, $path, $domain, $secure); } // -------------------------------------------------------------------- @@ -413,7 +441,7 @@ class CI_Input { { if (is_array($_GET) AND count($_GET) > 0) { - foreach($_GET as $key => $val) + foreach ($_GET as $key => $val) { $_GET[$this->_clean_input_keys($key)] = $this->_clean_input_data($val); } @@ -423,7 +451,7 @@ class CI_Input { // Clean $_POST Data if (is_array($_POST) AND count($_POST) > 0) { - foreach($_POST as $key => $val) + foreach ($_POST as $key => $val) { $_POST[$this->_clean_input_keys($key)] = $this->_clean_input_data($val); } @@ -441,7 +469,7 @@ class CI_Input { unset($_COOKIE['$Path']); unset($_COOKIE['$Domain']); - foreach($_COOKIE as $key => $val) + foreach ($_COOKIE as $key => $val) { $_COOKIE[$this->_clean_input_keys($key)] = $this->_clean_input_data($val); } @@ -495,6 +523,9 @@ class CI_Input { { $str = $this->uni->clean_string($str); } + + // Remove control characters + $str = remove_invisible_characters($str); // Should we filter the input data? if ($this->_enable_xss === TRUE) @@ -507,7 +538,7 @@ class CI_Input { { if (strpos($str, "\r") !== FALSE) { - $str = str_replace(array("\r\n", "\r"), PHP_EOL, $str); + $str = str_replace(array("\r\n", "\r", "\r\n\n"), PHP_EOL, $str); } } @@ -610,8 +641,7 @@ class CI_Input { if ($xss_clean === TRUE) { - $_security =& load_class('Security'); - return $_security->xss_clean($this->headers[$index]); + return $this->security->xss_clean($this->headers[$index]); } return $this->headers[$index]; @@ -649,4 +679,4 @@ class CI_Input { // END Input class /* End of file Input.php */ -/* Location: ./system/core/Input.php */
\ No newline at end of file +/* Location: ./system/core/Input.php */ diff --git a/system/core/Lang.php b/system/core/Lang.php index fb177902e..0b926a303 100755 --- a/system/core/Lang.php +++ b/system/core/Lang.php @@ -130,6 +130,13 @@ class CI_Lang { function line($line = '') { $line = ($line == '' OR ! isset($this->language[$line])) ? FALSE : $this->language[$line]; + + // Because killer robots like unicorns! + if ($line === FALSE) + { + log_message('error', 'Could not find the language line "'.$line.'"'); + } + return $line; } diff --git a/system/core/Loader.php b/system/core/Loader.php index 07166188e..e75805d0e 100755 --- a/system/core/Loader.php +++ b/system/core/Loader.php @@ -79,9 +79,9 @@ class CI_Loader { { if (is_array($library)) { - foreach($library as $read) + foreach ($library as $class) { - $this->library($read); + $this->library($class, $params); } return; @@ -97,17 +97,7 @@ class CI_Loader { $params = NULL; } - if (is_array($library)) - { - foreach ($library as $class) - { - $this->_ci_load_class($class, $params, $object_name); - } - } - else - { - $this->_ci_load_class($library, $params, $object_name); - } + $this->_ci_load_class($library, $params, $object_name); } // -------------------------------------------------------------------- @@ -127,7 +117,7 @@ class CI_Loader { { if (is_array($model)) { - foreach($model as $babe) + foreach ($model as $babe) { $this->model($babe); } @@ -880,8 +870,19 @@ class CI_Loader { foreach ($config_component->_config_paths as $path) { // We test for both uppercase and lowercase, for servers that - // are case-sensitive with regard to file names - if (file_exists($path .'config/'.strtolower($class).EXT)) + // are case-sensitive with regard to file names. Check for environment + // first, global next + if (defined('ENVIRONMENT') AND file_exists($path .'config/'.ENVIRONMENT.'/'.strtolower($class).EXT)) + { + include_once($path .'config/'.ENVIRONMENT.'/'.strtolower($class).EXT); + break; + } + elseif (defined('ENVIRONMENT') AND file_exists($path .'config/'.ENVIRONMENT.'/'.ucfirst(strtolower($class)).EXT)) + { + include_once($path .'config/'.ENVIRONMENT.'/'.ucfirst(strtolower($class)).EXT); + break; + } + elseif (file_exists($path .'config/'.strtolower($class).EXT)) { include_once($path .'config/'.strtolower($class).EXT); break; @@ -964,7 +965,15 @@ class CI_Loader { */ function _ci_autoloader() { - include_once(APPPATH.'config/autoload'.EXT); + if (defined('ENVIRONMENT') AND file_exists(APPPATH.'config/'.ENVIRONMENT.'/autoload'.EXT)) + { + include_once(APPPATH.'config/'.ENVIRONMENT.'/autoload'.EXT); + } + else + { + include_once(APPPATH.'config/autoload'.EXT); + } + if ( ! isset($autoload)) { @@ -1092,4 +1101,4 @@ class CI_Loader { } /* End of file Loader.php */ -/* Location: ./system/core/Loader.php */
\ No newline at end of file +/* Location: ./system/core/Loader.php */ diff --git a/system/core/Output.php b/system/core/Output.php index 7fb9f7916..45a82f3cb 100755 --- a/system/core/Output.php +++ b/system/core/Output.php @@ -28,19 +28,32 @@ */ class CI_Output { - var $final_output; - var $cache_expiration = 0; - var $headers = array(); - var $enable_profiler = FALSE; - var $parse_exec_vars = TRUE; // whether or not to parse variables like {elapsed_time} and {memory_usage} - - var $_zlib_oc = FALSE; - var $_profiler_sections = array(); + protected $final_output; + protected $cache_expiration = 0; + protected $headers = array(); + protected $mime_types = array(); + protected $enable_profiler = FALSE; + protected $_zlib_oc = FALSE; + protected $_profiler_sections = array(); + protected $parse_exec_vars = TRUE; // whether or not to parse variables like {elapsed_time} and {memory_usage} function __construct() { $this->_zlib_oc = @ini_get('zlib.output_compression'); + // Get mime types for later + if (defined('ENVIRONMENT') AND file_exists(APPPATH.'config/'.ENVIRONMENT.'/mimes'.EXT)) + { + include APPPATH.'config/'.ENVIRONMENT.'/mimes'.EXT; + } + else + { + include APPPATH.'config/mimes'.EXT; + } + + + $this->mime_types = $mimes; + log_message('debug', "Output Class Initialized"); } @@ -73,6 +86,8 @@ class CI_Output { function set_output($output) { $this->final_output = $output; + + return $this; } // -------------------------------------------------------------------- @@ -96,6 +111,8 @@ class CI_Output { { $this->final_output .= $output; } + + return $this; } // -------------------------------------------------------------------- @@ -125,6 +142,42 @@ class CI_Output { } $this->headers[] = array($header, $replace); + + return $this; + } + + // -------------------------------------------------------------------- + + /** + * Set Content Type Header + * + * @access public + * @param string extension of the file we're outputting + * @return void + */ + function set_content_type($mime_type) + { + if (strpos($mime_type, '/') === FALSE) + { + $extension = ltrim($mime_type, '.'); + + // Is this extension supported? + if (isset($this->mime_types[$extension])) + { + $mime_type =& $this->mime_types[$extension]; + + if (is_array($mime_type)) + { + $mime_type = current($mime_type); + } + } + } + + $header = 'Content-Type: '.$mime_type; + + $this->headers[] = array($header, TRUE); + + return $this; } // -------------------------------------------------------------------- @@ -141,6 +194,8 @@ class CI_Output { function set_status_header($code = 200, $text = '') { set_status_header($code, $text); + + return $this; } // -------------------------------------------------------------------- @@ -155,6 +210,8 @@ class CI_Output { function enable_profiler($val = TRUE) { $this->enable_profiler = (is_bool($val)) ? $val : TRUE; + + return $this; } // -------------------------------------------------------------------- @@ -174,6 +231,8 @@ class CI_Output { { $this->_profiler_sections[$section] = ($enable !== FALSE) ? TRUE : FALSE; } + + return $this; } // -------------------------------------------------------------------- @@ -188,6 +247,8 @@ class CI_Output { function cache($time) { $this->cache_expiration = ( ! is_numeric($time)) ? 0 : $time; + + return $this; } // -------------------------------------------------------------------- diff --git a/system/core/Router.php b/system/core/Router.php index 7be508fef..d451aab68 100755 --- a/system/core/Router.php +++ b/system/core/Router.php @@ -87,7 +87,15 @@ class CI_Router { } // Load the routes.php file. - @include(APPPATH.'config/routes'.EXT); + if (defined('ENVIRONMENT') AND is_file(APPPATH.'config/'.ENVIRONMENT.'/routes'.EXT)) + { + include(APPPATH.'config/'.ENVIRONMENT.'/routes'.EXT); + } + elseif (is_file(APPPATH.'config/routes'.EXT)) + { + include(APPPATH.'config/routes'.EXT); + } + $this->routes = ( ! isset($route) OR ! is_array($route)) ? array() : $route; unset($route); @@ -270,7 +278,7 @@ class CI_Router { // If we've gotten this far it means that the URI does not correlate to a valid // controller class. We will now see if there is an override - if (!empty($this->routes['404_override'])) + if ( ! empty($this->routes['404_override'])) { $x = explode('/', $this->routes['404_override']); diff --git a/system/core/Security.php b/system/core/Security.php new file mode 100755 index 000000000..ceef9779c --- /dev/null +++ b/system/core/Security.php @@ -0,0 +1,820 @@ +<?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]', + '<!--' => '<!--', + '-->' => '-->', + '<![CDATA[' => '<![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', "<?\\1", $str); + } + else + { + $str = str_replace(array('<?', '?'.'>'), array('<?', '?>'), $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: <blink> + */ + $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('some code') + */ + $str = preg_replace('#(alert|cmd|passthru|eval|exec|expression|system|fopen|fsockopen|file|file_get_contents|readfile|unlink)(\s*)\((.*?)\)#si', "\\1\\2(\\3)", $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 + $str = '<'.$matches[1].$matches[2].$matches[3]; + + // encode captured opening or closing brace to prevent recursive vectors + $str .= str_replace(array('>', '<'), array('>', '<'), + $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('>', '<', '\\\\'), $match[0]); + } + + // -------------------------------------------------------------------- + + /** + * Filter Attributes + * + * Filters tag attributes for consistency and safety + * + * @param string + * @return string + */ + protected function _filter_attributes($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 $this->_csrf_hash; + } + +} +// END Security Class + +/* End of file Security.php */ +/* Location: ./system/libraries/Security.php */
\ No newline at end of file diff --git a/system/core/URI.php b/system/core/URI.php index 88f237bcf..80dc62e58 100755 --- a/system/core/URI.php +++ b/system/core/URI.php @@ -61,17 +61,17 @@ class CI_URI { { if (strtoupper($this->config->item('uri_protocol')) == 'AUTO') { - // Arguments exist, it must be a command line request - if ( ! empty($_SERVER['argv'])) + // Is the request coming from the command line? + if (defined('STDIN')) { - $this->uri_string = $this->_parse_cli_args(); + $this->_set_uri_string($this->_parse_cli_args()); return; } // Let's try the REQUEST_URI first, this will work in most situations if ($uri = $this->_detect_uri()) { - $this->uri_string = $uri; + $this->_set_uri_string($uri); return; } @@ -80,7 +80,7 @@ class CI_URI { $path = (isset($_SERVER['PATH_INFO'])) ? $_SERVER['PATH_INFO'] : @getenv('PATH_INFO'); if (trim($path, '/') != '' && $path != "/".SELF) { - $this->uri_string = $path; + $this->_set_uri_string($path); return; } @@ -88,43 +88,54 @@ class CI_URI { $path = (isset($_SERVER['QUERY_STRING'])) ? $_SERVER['QUERY_STRING'] : @getenv('QUERY_STRING'); if (trim($path, '/') != '') { - $this->uri_string = $path; + $this->_set_uri_string($path); return; } // As a last ditch effort lets try using the $_GET array if (is_array($_GET) && count($_GET) == 1 && trim(key($_GET), '/') != '') { - $this->uri_string = key($_GET); + $this->_set_uri_string(key($_GET)); return; } // We've exhausted all our options... $this->uri_string = ''; + return; } - else - { - $uri = strtoupper($this->config->item('uri_protocol')); - if ($uri == 'REQUEST_URI') - { - $this->uri_string = $this->_detect_uri(); - return; - } - elseif ($uri == 'CLI') - { - $this->uri_string = $this->_parse_cli_args(); - return; - } + $uri = strtoupper($this->config->item('uri_protocol')); - $this->uri_string = (isset($_SERVER[$uri])) ? $_SERVER[$uri] : @getenv($uri); + if ($uri == 'REQUEST_URI') + { + $this->_set_uri_string($this->_detect_uri()); + return; } - - // If the URI contains only a slash we'll kill it - if ($this->uri_string == '/') + elseif ($uri == 'CLI') { - $this->uri_string = ''; + $this->_set_uri_string($this->_parse_cli_args()); + return; } + + $path = (isset($_SERVER[$uri])) ? $_SERVER[$uri] : @getenv($uri); + $this->_set_uri_string($path); + } + + // -------------------------------------------------------------------- + + /** + * Set the URI String + * + * @access public + * @return string + */ + function _set_uri_string($str) + { + // Filter out control characters + $str = remove_invisible_characters($str, FALSE); + + // If the URI contains only a slash we'll kill it + $this->uri_string = ($str == '/') ? '' : $str; } // -------------------------------------------------------------------- @@ -173,10 +184,16 @@ class CI_URI { $_SERVER['QUERY_STRING'] = ''; $_GET = array(); } + + if ($uri == '/' || empty($uri)) + { + return '/'; + } + $uri = parse_url($uri, PHP_URL_PATH); // Do some final cleaning of the URI and return it - return str_replace(array('//', '../'), '/', ltrim($uri, '/')); + return str_replace(array('//', '../'), '/', trim($uri, '/')); } // -------------------------------------------------------------------- diff --git a/system/core/Utf8.php b/system/core/Utf8.php index 5d5a7ef72..2a27d1f35 100755 --- a/system/core/Utf8.php +++ b/system/core/Utf8.php @@ -107,7 +107,7 @@ class CI_Utf8 { */ function safe_ascii_for_xml($str) { - return preg_replace('/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F]+/S', '', $str); + return remove_invisible_characters($str, FALSE); } // -------------------------------------------------------------------- |