--- /dev/null
+<?php defined('SYSPATH') OR die('No direct access allowed.');
+/**
+ * Input library.
+ *
+ * $Id: Input.php 4346 2009-05-11 17:08:15Z zombor $
+ *
+ * @package Core
+ * @author Kohana Team
+ * @copyright (c) 2007-2008 Kohana Team
+ * @license http://kohanaphp.com/license.html
+ */
+class Input_Core {
+
+ // Enable or disable automatic XSS cleaning
+ protected $use_xss_clean = FALSE;
+
+ // Are magic quotes enabled?
+ protected $magic_quotes_gpc = FALSE;
+
+ // IP address of current user
+ public $ip_address;
+
+ // Input singleton
+ protected static $instance;
+
+ /**
+ * Retrieve a singleton instance of Input. This will always be the first
+ * created instance of this class.
+ *
+ * @return object
+ */
+ public static function instance()
+ {
+ if (Input::$instance === NULL)
+ {
+ // Create a new instance
+ return new Input;
+ }
+
+ return Input::$instance;
+ }
+
+ /**
+ * Sanitizes global GET, POST and COOKIE data. Also takes care of
+ * magic_quotes and register_globals, if they have been enabled.
+ *
+ * @return void
+ */
+ public function __construct()
+ {
+ // Use XSS clean?
+ $this->use_xss_clean = (bool) Kohana::config('core.global_xss_filtering');
+
+ if (Input::$instance === NULL)
+ {
+ // magic_quotes_runtime is enabled
+ if (get_magic_quotes_runtime())
+ {
+ set_magic_quotes_runtime(0);
+ Kohana::log('debug', 'Disable magic_quotes_runtime! It is evil and deprecated: http://php.net/magic_quotes');
+ }
+
+ // magic_quotes_gpc is enabled
+ if (get_magic_quotes_gpc())
+ {
+ $this->magic_quotes_gpc = TRUE;
+ Kohana::log('debug', 'Disable magic_quotes_gpc! It is evil and deprecated: http://php.net/magic_quotes');
+ }
+
+ // register_globals is enabled
+ if (ini_get('register_globals'))
+ {
+ if (isset($_REQUEST['GLOBALS']))
+ {
+ // Prevent GLOBALS override attacks
+ exit('Global variable overload attack.');
+ }
+
+ // Destroy the REQUEST global
+ $_REQUEST = array();
+
+ // These globals are standard and should not be removed
+ $preserve = array('GLOBALS', '_REQUEST', '_GET', '_POST', '_FILES', '_COOKIE', '_SERVER', '_ENV', '_SESSION');
+
+ // This loop has the same effect as disabling register_globals
+ foreach (array_diff(array_keys($GLOBALS), $preserve) as $key)
+ {
+ global $$key;
+ $$key = NULL;
+
+ // Unset the global variable
+ unset($GLOBALS[$key], $$key);
+ }
+
+ // Warn the developer about register globals
+ Kohana::log('debug', 'Disable register_globals! It is evil and deprecated: http://php.net/register_globals');
+ }
+
+ if (is_array($_GET))
+ {
+ foreach ($_GET as $key => $val)
+ {
+ // Sanitize $_GET
+ $_GET[$this->clean_input_keys($key)] = $this->clean_input_data($val);
+ }
+ }
+ else
+ {
+ $_GET = array();
+ }
+
+ if (is_array($_POST))
+ {
+ foreach ($_POST as $key => $val)
+ {
+ // Sanitize $_POST
+ $_POST[$this->clean_input_keys($key)] = $this->clean_input_data($val);
+ }
+ }
+ else
+ {
+ $_POST = array();
+ }
+
+ if (is_array($_COOKIE))
+ {
+ foreach ($_COOKIE as $key => $val)
+ {
+ // Ignore special attributes in RFC2109 compliant cookies
+ if ($key == '$Version' OR $key == '$Path' OR $key == '$Domain')
+ continue;
+
+ // Sanitize $_COOKIE
+ $_COOKIE[$this->clean_input_keys($key)] = $this->clean_input_data($val);
+ }
+ }
+ else
+ {
+ $_COOKIE = array();
+ }
+
+ // Create a singleton
+ Input::$instance = $this;
+
+ Kohana::log('debug', 'Global GET, POST and COOKIE data sanitized');
+ }
+ }
+
+ /**
+ * Fetch an item from the $_GET array.
+ *
+ * @param string key to find
+ * @param mixed default value
+ * @param boolean XSS clean the value
+ * @return mixed
+ */
+ public function get($key = array(), $default = NULL, $xss_clean = FALSE)
+ {
+ return $this->search_array($_GET, $key, $default, $xss_clean);
+ }
+
+ /**
+ * Fetch an item from the $_POST array.
+ *
+ * @param string key to find
+ * @param mixed default value
+ * @param boolean XSS clean the value
+ * @return mixed
+ */
+ public function post($key = array(), $default = NULL, $xss_clean = FALSE)
+ {
+ return $this->search_array($_POST, $key, $default, $xss_clean);
+ }
+
+ /**
+ * Fetch an item from the $_COOKIE array.
+ *
+ * @param string key to find
+ * @param mixed default value
+ * @param boolean XSS clean the value
+ * @return mixed
+ */
+ public function cookie($key = array(), $default = NULL, $xss_clean = FALSE)
+ {
+ return $this->search_array($_COOKIE, $key, $default, $xss_clean);
+ }
+
+ /**
+ * Fetch an item from the $_SERVER array.
+ *
+ * @param string key to find
+ * @param mixed default value
+ * @param boolean XSS clean the value
+ * @return mixed
+ */
+ public function server($key = array(), $default = NULL, $xss_clean = FALSE)
+ {
+ return $this->search_array($_SERVER, $key, $default, $xss_clean);
+ }
+
+ /**
+ * Fetch an item from a global array.
+ *
+ * @param array array to search
+ * @param string key to find
+ * @param mixed default value
+ * @param boolean XSS clean the value
+ * @return mixed
+ */
+ protected function search_array($array, $key, $default = NULL, $xss_clean = FALSE)
+ {
+ if ($key === array())
+ return $array;
+
+ if ( ! isset($array[$key]))
+ return $default;
+
+ // Get the value
+ $value = $array[$key];
+
+ if ($this->use_xss_clean === FALSE AND $xss_clean === TRUE)
+ {
+ // XSS clean the value
+ $value = $this->xss_clean($value);
+ }
+
+ return $value;
+ }
+
+ /**
+ * Fetch the IP Address.
+ *
+ * @return string
+ */
+ public function ip_address()
+ {
+ if ($this->ip_address !== NULL)
+ return $this->ip_address;
+
+ // Server keys that could contain the client IP address
+ $keys = array('HTTP_X_FORWARDED_FOR', 'HTTP_CLIENT_IP', 'REMOTE_ADDR');
+
+ foreach ($keys as $key)
+ {
+ if ($ip = $this->server($key))
+ {
+ $this->ip_address = $ip;
+
+ // An IP address has been found
+ break;
+ }
+ }
+
+ if ($comma = strrpos($this->ip_address, ',') !== FALSE)
+ {
+ $this->ip_address = substr($this->ip_address, $comma + 1);
+ }
+
+ if ( ! valid::ip($this->ip_address))
+ {
+ // Use an empty IP
+ $this->ip_address = '0.0.0.0';
+ }
+
+ return $this->ip_address;
+ }
+
+ /**
+ * Clean cross site scripting exploits from string.
+ * HTMLPurifier may be used if installed, otherwise defaults to built in method.
+ * Note - This function should only be used to deal with data upon submission.
+ * It's not something that should be used for general runtime processing
+ * since it requires a fair amount of processing overhead.
+ *
+ * @param string data to clean
+ * @param string xss_clean method to use ('htmlpurifier' or defaults to built-in method)
+ * @return string
+ */
+ public function xss_clean($data, $tool = NULL)
+ {
+ if ($tool === NULL)
+ {
+ // Use the default tool
+ $tool = Kohana::config('core.global_xss_filtering');
+ }
+
+ if (is_array($data))
+ {
+ foreach ($data as $key => $val)
+ {
+ $data[$key] = $this->xss_clean($val, $tool);
+ }
+
+ return $data;
+ }
+
+ // Do not clean empty strings
+ if (trim($data) === '')
+ return $data;
+
+ if ($tool === TRUE)
+ {
+ // NOTE: This is necessary because switch is NOT type-sensative!
+ $tool = 'default';
+ }
+
+ switch ($tool)
+ {
+ case 'htmlpurifier':
+ /**
+ * @todo License should go here, http://htmlpurifier.org/
+ */
+ if ( ! class_exists('HTMLPurifier_Config', FALSE))
+ {
+ // Load HTMLPurifier
+ require Kohana::find_file('vendor', 'htmlpurifier/HTMLPurifier.auto', TRUE);
+ require 'HTMLPurifier.func.php';
+ }
+
+ // Set configuration
+ $config = HTMLPurifier_Config::createDefault();
+ $config->set('HTML', 'TidyLevel', 'none'); // Only XSS cleaning now
+
+ // Run HTMLPurifier
+ $data = HTMLPurifier($data, $config);
+ break;
+ default:
+ // http://svn.bitflux.ch/repos/public/popoon/trunk/classes/externalinput.php
+ // +----------------------------------------------------------------------+
+ // | Copyright (c) 2001-2006 Bitflux GmbH |
+ // +----------------------------------------------------------------------+
+ // | Licensed under the Apache License, Version 2.0 (the "License"); |
+ // | you may not use this file except in compliance with the License. |
+ // | You may obtain a copy of the License at |
+ // | http://www.apache.org/licenses/LICENSE-2.0 |
+ // | Unless required by applicable law or agreed to in writing, software |
+ // | distributed under the License is distributed on an "AS IS" BASIS, |
+ // | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
+ // | implied. See the License for the specific language governing |
+ // | permissions and limitations under the License. |
+ // +----------------------------------------------------------------------+
+ // | Author: Christian Stocker <chregu@bitflux.ch> |
+ // +----------------------------------------------------------------------+
+ //
+ // Kohana Modifications:
+ // * Changed double quotes to single quotes, changed indenting and spacing
+ // * Removed magic_quotes stuff
+ // * Increased regex readability:
+ // * Used delimeters that aren't found in the pattern
+ // * Removed all unneeded escapes
+ // * Deleted U modifiers and swapped greediness where needed
+ // * Increased regex speed:
+ // * Made capturing parentheses non-capturing where possible
+ // * Removed parentheses where possible
+ // * Split up alternation alternatives
+ // * Made some quantifiers possessive
+
+ // Fix &entity\n;
+ $data = str_replace(array('&','<','>'), array('&amp;','&lt;','&gt;'), $data);
+ $data = preg_replace('/(&#*\w+)[\x00-\x20]+;/u', '$1;', $data);
+ $data = preg_replace('/(&#x*[0-9A-F]+);*/iu', '$1;', $data);
+ $data = html_entity_decode($data, ENT_COMPAT, 'UTF-8');
+
+ // Remove any attribute starting with "on" or xmlns
+ $data = preg_replace('#(<[^>]+?[\x00-\x20"\'])(?:on|xmlns)[^>]*+>#iu', '$1>', $data);
+
+ // Remove javascript: and vbscript: protocols
+ $data = preg_replace('#([a-z]*)[\x00-\x20]*=[\x00-\x20]*([`\'"]*)[\x00-\x20]*j[\x00-\x20]*a[\x00-\x20]*v[\x00-\x20]*a[\x00-\x20]*s[\x00-\x20]*c[\x00-\x20]*r[\x00-\x20]*i[\x00-\x20]*p[\x00-\x20]*t[\x00-\x20]*:#iu', '$1=$2nojavascript...', $data);
+ $data = preg_replace('#([a-z]*)[\x00-\x20]*=([\'"]*)[\x00-\x20]*v[\x00-\x20]*b[\x00-\x20]*s[\x00-\x20]*c[\x00-\x20]*r[\x00-\x20]*i[\x00-\x20]*p[\x00-\x20]*t[\x00-\x20]*:#iu', '$1=$2novbscript...', $data);
+ $data = preg_replace('#([a-z]*)[\x00-\x20]*=([\'"]*)[\x00-\x20]*-moz-binding[\x00-\x20]*:#u', '$1=$2nomozbinding...', $data);
+
+ // Only works in IE: <span style="width: expression(alert('Ping!'));"></span>
+ $data = preg_replace('#(<[^>]+?)style[\x00-\x20]*=[\x00-\x20]*[`\'"]*.*?expression[\x00-\x20]*\([^>]*+>#i', '$1>', $data);
+ $data = preg_replace('#(<[^>]+?)style[\x00-\x20]*=[\x00-\x20]*[`\'"]*.*?behaviour[\x00-\x20]*\([^>]*+>#i', '$1>', $data);
+ $data = preg_replace('#(<[^>]+?)style[\x00-\x20]*=[\x00-\x20]*[`\'"]*.*?s[\x00-\x20]*c[\x00-\x20]*r[\x00-\x20]*i[\x00-\x20]*p[\x00-\x20]*t[\x00-\x20]*:*[^>]*+>#iu', '$1>', $data);
+
+ // Remove namespaced elements (we do not need them)
+ $data = preg_replace('#</*\w+:\w[^>]*+>#i', '', $data);
+
+ do
+ {
+ // Remove really unwanted tags
+ $old_data = $data;
+ $data = preg_replace('#</*(?:applet|b(?:ase|gsound|link)|embed|frame(?:set)?|i(?:frame|layer)|l(?:ayer|ink)|meta|object|s(?:cript|tyle)|title|xml)[^>]*+>#i', '', $data);
+ }
+ while ($old_data !== $data);
+ break;
+ }
+
+ return $data;
+ }
+
+ /**
+ * This is a helper method. It enforces W3C specifications for allowed
+ * key name strings, to prevent malicious exploitation.
+ *
+ * @param string string to clean
+ * @return string
+ */
+ public function clean_input_keys($str)
+ {
+ $chars = PCRE_UNICODE_PROPERTIES ? '\pL' : 'a-zA-Z';
+
+ if ( ! preg_match('#^['.$chars.'0-9:_.-]++$#uD', $str))
+ {
+ exit('Disallowed key characters in global data.');
+ }
+
+ return $str;
+ }
+
+ /**
+ * This is a helper method. It escapes data and forces all newline
+ * characters to "\n".
+ *
+ * @param unknown_type string to clean
+ * @return string
+ */
+ public function clean_input_data($str)
+ {
+ if (is_array($str))
+ {
+ $new_array = array();
+ foreach ($str as $key => $val)
+ {
+ // Recursion!
+ $new_array[$this->clean_input_keys($key)] = $this->clean_input_data($val);
+ }
+ return $new_array;
+ }
+
+ if ($this->magic_quotes_gpc === TRUE)
+ {
+ // Remove annoying magic quotes
+ $str = stripslashes($str);
+ }
+
+ if ($this->use_xss_clean === TRUE)
+ {
+ $str = $this->xss_clean($str);
+ }
+
+ if (strpos($str, "\r") !== FALSE)
+ {
+ // Standardize newlines
+ $str = str_replace(array("\r\n", "\r"), "\n", $str);
+ }
+
+ return $str;
+ }
+
+} // End Input Class
projects / speedfreak / blobdiff