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-rw-r--r--system/libraries/Input.php1278
1 files changed, 639 insertions, 639 deletions
diff --git a/system/libraries/Input.php b/system/libraries/Input.php
index 4fd2061c7..f346cabaa 100644
--- a/system/libraries/Input.php
+++ b/system/libraries/Input.php
@@ -1,640 +1,640 @@
-<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
-/**
- * Code Igniter
- *
- * An open source application development framework for PHP 4.3.2 or newer
- *
- * @package CodeIgniter
- * @author Rick Ellis
- * @copyright Copyright (c) 2006, pMachine, Inc.
- * @license http://www.codeignitor.com/user_guide/license.html
- * @link http://www.codeigniter.com
- * @since Version 1.0
- * @filesource
- */
-
-// ------------------------------------------------------------------------
-
-/**
- * Input Class
- *
- * Pre-processes global input data for security
- *
- * @package CodeIgniter
- * @subpackage Libraries
- * @category Input
- * @author Rick Ellis
- * @link http://www.codeigniter.com/user_guide/libraries/input.html
- */
-class CI_Input {
- var $use_xss_clean = FALSE;
- var $ip_address = FALSE;
- var $user_agent = FALSE;
- var $allow_get_array = FALSE;
-
- /**
- * Constructor
- *
- * Sets whether to globally enable the XSS processing
- * and whether to allow the $_GET array
- *
- * @access public
- */
- function CI_Input()
- {
- log_message('debug', "Input Class Initialized");
-
- $CFG =& load_class('Config');
- $this->use_xss_clean = ($CFG->item('global_xss_filtering') === TRUE) ? TRUE : FALSE;
- $this->allow_get_array = ($CFG->item('enable_query_strings') === TRUE) ? TRUE : FALSE;
- $this->_sanitize_globals();
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Sanitize Globals
- *
- * This function does the following:
- *
- * Unsets $_GET data (if query strings are not enabled)
- *
- * Unsets all globals if register_globals is enabled
- *
- * Standardizes newline characters to \n
- *
- * @access private
- * @return void
- */
- function _sanitize_globals()
- {
- // Unset globals. This is effectively the same as register_globals = off
- foreach (array($_GET, $_POST, $_COOKIE) as $global)
- {
- if ( ! is_array($global))
- {
- global $global;
- $$global = NULL;
- }
- else
- {
- foreach ($global as $key => $val)
- {
- global $$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();
- }
-
- // 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($_COOKIE) > 0)
- {
- foreach($_COOKIE as $key => $val)
- {
- $_COOKIE[$this->_clean_input_keys($key)] = $this->_clean_input_data($val);
- }
- }
-
- 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 $new_array;
- }
-
- if ($this->use_xss_clean === TRUE)
- {
- $str = $this->xss_clean($str);
- }
-
- // Standardize newlines
- return preg_replace("/\015\012|\015|\012/", "\n", $str);
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Clean Keys
- *
- * This is a helper function. To prevent malicious users
- * from trying to exploit keys we make sure that keys are
- * only named with alpha-numeric text and a few other items.
- *
- * @access private
- * @param string
- * @return string
- */
- function _clean_input_keys($str)
- {
- if ( ! preg_match("/^[a-z0-9:_\/-]+$/i", $str))
- {
- exit('Disallowed Key Characters: '.$str);
- }
-
- if ( ! get_magic_quotes_gpc())
- {
- return addslashes($str);
- }
-
- return $str;
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Fetch an item from the POST array
- *
- * @access public
- * @param string
- * @param bool
- * @return string
- */
- function post($index = '', $xss_clean = FALSE)
- {
- if ( ! isset($_POST[$index]))
- {
- return FALSE;
- }
-
- if ($xss_clean === TRUE)
- {
- if (is_array($_POST[$index]))
- {
- foreach($_POST[$index] as $key => $val)
- {
- $_POST[$index][$key] = $this->xss_clean($val);
- }
- }
- else
- {
- return $this->xss_clean($_POST[$index]);
- }
- }
-
- return $_POST[$index];
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Fetch an item from the COOKIE array
- *
- * @access public
- * @param string
- * @param bool
- * @return string
- */
- function cookie($index = '', $xss_clean = FALSE)
- {
- if ( ! isset($_COOKIE[$index]))
- {
- return FALSE;
- }
-
- if ($xss_clean === TRUE)
- {
- if (is_array($_COOKIE[$index]))
- {
- $cookie = array();
- foreach($_COOKIE[$index] as $key => $val)
- {
- $cookie[$key] = $this->xss_clean($val);
- }
-
- return $cookie;
- }
- else
- {
- return $this->xss_clean($_COOKIE[$index]);
- }
- }
- else
- {
- return $_COOKIE[$index];
- }
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Fetch an item from the SERVER array
- *
- * @access public
- * @param string
- * @param bool
- * @return string
- */
- function server($index = '', $xss_clean = FALSE)
- {
- if ( ! isset($_SERVER[$index]))
- {
- return FALSE;
- }
-
- if ($xss_clean === TRUE)
- {
- return $this->xss_clean($_SERVER[$index]);
- }
-
- return $_SERVER[$index];
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Fetch the IP Address
- *
- * @access public
- * @return string
- */
- function ip_address()
- {
- if ($this->ip_address !== FALSE)
- {
- return $this->ip_address;
- }
-
- if ($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 $this->ip_address;
- }
-
- if (strstr($this->ip_address, ','))
- {
- $x = explode(',', $this->ip_address);
- $this->ip_address = end($x);
- }
-
- if ( ! $this->valid_ip($this->ip_address))
- {
- $this->ip_address = '0.0.0.0';
- }
-
- return $this->ip_address;
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Validate IP Address
- *
- * @access public
- * @param string
- * @return string
- */
- function valid_ip($ip)
- {
- return ( ! preg_match( "/^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$/", $ip)) ? FALSE : TRUE;
- }
-
- // --------------------------------------------------------------------
-
- /**
- * User Agent
- *
- * @access public
- * @return string
- */
- function user_agent()
- {
- if ($this->user_agent !== FALSE)
- {
- return $this->user_agent;
- }
-
- $this->user_agent = ( ! isset($_SERVER['HTTP_USER_AGENT'])) ? FALSE : $_SERVER['HTTP_USER_AGENT'];
-
- return $this->user_agent;
- }
-
- // --------------------------------------------------------------------
-
- /**
- * XSS Clean
- *
- * Sanitizes data so that Cross Site Scripting Hacks can be
- * prevented.  This function does a fair amount of work but
- * it is extremely thorough, designed to prevent even the
- * most obscure XSS attempts.  Nothing is ever 100% foolproof,
- * of course, but I haven't been able to get anything passed
- * the filter.
- *
- * Note: This function should only be used to deal with data
- * upon submission.  It's not something that should
- * be used for general runtime processing.
- *
- * This function was based in part on some code and ideas I
- * got from Bitflux: http://blog.bitflux.ch/wiki/XSS_Prevention
- *
- * To help develop this script I used this great list of
- * vulnerabilities along with a few other hacks I've
- * harvested from examining vulnerabilities in other programs:
- * http://ha.ckers.org/xss.html
- *
- * @access public
- * @param string
- * @return string
- */
- function xss_clean($str, $charset = 'ISO-8859-1')
- {
- /*
- * Remove Null Characters
- *
- * This prevents sandwiching null characters
- * between ascii characters, like Java\0script.
- *
- */
- $str = preg_replace('/\0+/', '', $str);
- $str = preg_replace('/(\\\\0)+/', '', $str);
-
- /*
- * Validate standard character entities
- *
- * Add a semicolon if missing. We do this to enable
- * the conversion of entities to ASCII later.
- *
- */
- $str = preg_replace('#(&\#*\w+)[\x00-\x20]+;#u',"\\1;",$str);
-
- /*
- * Validate UTF16 two byte encoding (x00)
- *
- * Just as above, adds a semicolon if missing.
- *
- */
- $str = preg_replace('#(&\#x*)([0-9A-F]+);*#iu',"\\1\\2;",$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: Normally urldecode() would be easier but it removes plus signs
- *
- */
- $str = preg_replace("/%u0([a-z0-9]{3})/i", "&#x\\1;", $str);
- $str = preg_replace("/%([a-z0-9]{2})/i", "&#x\\1;", $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.
- *
- */
- if (preg_match_all("/<(.+?)>/si", $str, $matches))
- {
- for ($i = 0; $i < count($matches['0']); $i++)
- {
- $str = str_replace($matches['1'][$i],
- $this->_html_entity_decode($matches['1'][$i], $charset),
- $str);
- }
- }
-
- /*
- * Not Allowed Under Any Conditions
- */
- $bad = array(
- 'document.cookie' => '[removed]',
- 'document.write' => '[removed]',
- 'window.location' => '[removed]',
- "javascript\s*:" => '[removed]',
- "Redirect\s+302" => '[removed]',
- '<!--' => '&lt;!--',
- '-->' => '--&gt;'
- );
-
- foreach ($bad as $key => $val)
- {
- $str = preg_replace("#".$key."#i", $val, $str);
- }
-
- /*
- * Convert all tabs to spaces
- *
- * This prevents strings like this: ja vascript
- * Note: we deal with spaces between characters later.
- *
- */
- $str = preg_replace("#\t+#", " ", $str);
-
- /*
- * Makes PHP tags safe
- *
- * Note: XML tags are inadvertently replaced too:
- *
- * <?xml
- *
- * But it doesn't seem to pose a problem.
- *
- */
- $str = str_replace(array('<?php', '<?PHP', '<?', '?>'), array('&lt;?php', '&lt;?PHP', '&lt;?', '?&gt;'), $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.
- *
- */
- $words = array('javascript', 'vbscript', 'script', 'applet', 'alert', 'document', 'write', 'cookie', 'window');
- foreach ($words as $word)
- {
- $temp = '';
- for ($i = 0; $i < strlen($word); $i++)
- {
- $temp .= substr($word, $i, 1)."\s*";
- }
-
- $temp = substr($temp, 0, -3);
- $str = preg_replace('#'.$temp.'#s', $word, $str);
- $str = preg_replace('#'.ucfirst($temp).'#s', ucfirst($word), $str);
- }
-
- /*
- * Remove disallowed Javascript in links or img tags
- */
- $str = preg_replace("#<a.+?href=.*?(alert\(|alert&\#40;|javascript\:|window\.|document\.|\.cookie|<script|<xss).*?\>.*?</a>#si", "", $str);
- $str = preg_replace("#<img.+?src=.*?(alert\(|alert&\#40;|javascript\:|window\.|document\.|\.cookie|<script|<xss).*?\>#si", "", $str);
- $str = preg_replace("#<(script|xss).*?\>#si", "", $str);
-
- /*
- * Remove JavaScript Event Handlers
- *
- * Note: This code is a little blunt. It removes
- * the event handler and anything up to the closing >,
- * but it's unlikely to be a problem.
- *
- */
- $str = preg_replace('#(<[^>]+.*?)(onblur|onchange|onclick|onfocus|onload|onmouseover|onmouseup|onmousedown|onselect|onsubmit|onunload|onkeypress|onkeydown|onkeyup|onresize)[^>]*>#iU',"\\1>",$str);
-
- /*
- * 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: &lt;blink&gt;
- *
- */
- $str = preg_replace('#<(/*\s*)(alert|applet|basefont|base|behavior|bgsound|blink|body|embed|expression|form|frameset|frame|head|html|ilayer|iframe|input|layer|link|meta|object|plaintext|style|script|textarea|title|xml|xss)([^>]*)>#is', "&lt;\\1\\2\\3&gt;", $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&#40;'some code'&#41;
- *
- */
- $str = preg_replace('#(alert|cmd|passthru|eval|exec|system|fopen|fsockopen|file|file_get_contents|readfile|unlink)(\s*)\((.*?)\)#si', "\\1\\2&#40;\\3&#41;", $str);
-
- /*
- * Final clean up
- *
- * This adds a bit of extra precaution in case
- * something got through the above filters
- *
- */
- $bad = array(
- 'document.cookie' => '[removed]',
- 'document.write' => '[removed]',
- 'window.location' => '[removed]',
- "javascript\s*:" => '[removed]',
- "Redirect\s+302" => '[removed]',
- '<!--' => '&lt;!--',
- '-->' => '--&gt;'
- );
-
- foreach ($bad as $key => $val)
- {
- $str = preg_replace("#".$key."#i", $val, $str);
- }
-
-
- log_message('debug', "XSS Filtering completed");
- return $str;
- }
-
- // --------------------------------------------------------------------
-
- /**
- * HTML Entities Decode
- *
- * This function is a replacement for html_entity_decode()
- *
- * In some versions of PHP the native function does not work
- * when UTF-8 is the specified character set, so this gives us
- * a work-around. More info here:
- * http://bugs.php.net/bug.php?id=25670
- *
- * @access private
- * @param string
- * @param string
- * @return string
- */
- /* -------------------------------------------------
- /* Replacement for html_entity_decode()
- /* -------------------------------------------------*/
-
- /*
- NOTE: html_entity_decode() has a bug in some PHP versions when UTF-8 is the
- character set, and the PHP developers said they were not back porting the
- fix to versions other than PHP 5.x.
- */
- function _html_entity_decode($str, $charset='ISO-8859-1')
- {
- if (stristr($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' OR version_compare(phpversion(), '5.0.0', '>=')))
- {
- $str = html_entity_decode($str, ENT_COMPAT, $charset);
- $str = preg_replace('~&#x([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([0-9a-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;
- }
-
-}
-// END Input class
+<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
+/**
+ * Code Igniter
+ *
+ * An open source application development framework for PHP 4.3.2 or newer
+ *
+ * @package CodeIgniter
+ * @author Rick Ellis
+ * @copyright Copyright (c) 2006, pMachine, Inc.
+ * @license http://www.codeignitor.com/user_guide/license.html
+ * @link http://www.codeigniter.com
+ * @since Version 1.0
+ * @filesource
+ */
+
+// ------------------------------------------------------------------------
+
+/**
+ * Input Class
+ *
+ * Pre-processes global input data for security
+ *
+ * @package CodeIgniter
+ * @subpackage Libraries
+ * @category Input
+ * @author Rick Ellis
+ * @link http://www.codeigniter.com/user_guide/libraries/input.html
+ */
+class CI_Input {
+ var $use_xss_clean = FALSE;
+ var $ip_address = FALSE;
+ var $user_agent = FALSE;
+ var $allow_get_array = FALSE;
+
+ /**
+ * Constructor
+ *
+ * Sets whether to globally enable the XSS processing
+ * and whether to allow the $_GET array
+ *
+ * @access public
+ */
+ function CI_Input()
+ {
+ log_message('debug', "Input Class Initialized");
+
+ $CFG =& load_class('Config');
+ $this->use_xss_clean = ($CFG->item('global_xss_filtering') === TRUE) ? TRUE : FALSE;
+ $this->allow_get_array = ($CFG->item('enable_query_strings') === TRUE) ? TRUE : FALSE;
+ $this->_sanitize_globals();
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Sanitize Globals
+ *
+ * This function does the following:
+ *
+ * Unsets $_GET data (if query strings are not enabled)
+ *
+ * Unsets all globals if register_globals is enabled
+ *
+ * Standardizes newline characters to \n
+ *
+ * @access private
+ * @return void
+ */
+ function _sanitize_globals()
+ {
+ // Unset globals. This is effectively the same as register_globals = off
+ foreach (array($_GET, $_POST, $_COOKIE) as $global)
+ {
+ if ( ! is_array($global))
+ {
+ global $global;
+ $$global = NULL;
+ }
+ else
+ {
+ foreach ($global as $key => $val)
+ {
+ global $$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();
+ }
+
+ // 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($_COOKIE) > 0)
+ {
+ foreach($_COOKIE as $key => $val)
+ {
+ $_COOKIE[$this->_clean_input_keys($key)] = $this->_clean_input_data($val);
+ }
+ }
+
+ 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 $new_array;
+ }
+
+ if ($this->use_xss_clean === TRUE)
+ {
+ $str = $this->xss_clean($str);
+ }
+
+ // Standardize newlines
+ return preg_replace("/\015\012|\015|\012/", "\n", $str);
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Clean Keys
+ *
+ * This is a helper function. To prevent malicious users
+ * from trying to exploit keys we make sure that keys are
+ * only named with alpha-numeric text and a few other items.
+ *
+ * @access private
+ * @param string
+ * @return string
+ */
+ function _clean_input_keys($str)
+ {
+ if ( ! preg_match("/^[a-z0-9:_\/-]+$/i", $str))
+ {
+ exit('Disallowed Key Characters.');
+ }
+
+ if ( ! get_magic_quotes_gpc())
+ {
+ return addslashes($str);
+ }
+
+ return $str;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Fetch an item from the POST array
+ *
+ * @access public
+ * @param string
+ * @param bool
+ * @return string
+ */
+ function post($index = '', $xss_clean = FALSE)
+ {
+ if ( ! isset($_POST[$index]))
+ {
+ return FALSE;
+ }
+
+ if ($xss_clean === TRUE)
+ {
+ if (is_array($_POST[$index]))
+ {
+ foreach($_POST[$index] as $key => $val)
+ {
+ $_POST[$index][$key] = $this->xss_clean($val);
+ }
+ }
+ else
+ {
+ return $this->xss_clean($_POST[$index]);
+ }
+ }
+
+ return $_POST[$index];
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Fetch an item from the COOKIE array
+ *
+ * @access public
+ * @param string
+ * @param bool
+ * @return string
+ */
+ function cookie($index = '', $xss_clean = FALSE)
+ {
+ if ( ! isset($_COOKIE[$index]))
+ {
+ return FALSE;
+ }
+
+ if ($xss_clean === TRUE)
+ {
+ if (is_array($_COOKIE[$index]))
+ {
+ $cookie = array();
+ foreach($_COOKIE[$index] as $key => $val)
+ {
+ $cookie[$key] = $this->xss_clean($val);
+ }
+
+ return $cookie;
+ }
+ else
+ {
+ return $this->xss_clean($_COOKIE[$index]);
+ }
+ }
+ else
+ {
+ return $_COOKIE[$index];
+ }
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Fetch an item from the SERVER array
+ *
+ * @access public
+ * @param string
+ * @param bool
+ * @return string
+ */
+ function server($index = '', $xss_clean = FALSE)
+ {
+ if ( ! isset($_SERVER[$index]))
+ {
+ return FALSE;
+ }
+
+ if ($xss_clean === TRUE)
+ {
+ return $this->xss_clean($_SERVER[$index]);
+ }
+
+ return $_SERVER[$index];
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Fetch the IP Address
+ *
+ * @access public
+ * @return string
+ */
+ function ip_address()
+ {
+ if ($this->ip_address !== FALSE)
+ {
+ return $this->ip_address;
+ }
+
+ if ($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 $this->ip_address;
+ }
+
+ if (strstr($this->ip_address, ','))
+ {
+ $x = explode(',', $this->ip_address);
+ $this->ip_address = end($x);
+ }
+
+ if ( ! $this->valid_ip($this->ip_address))
+ {
+ $this->ip_address = '0.0.0.0';
+ }
+
+ return $this->ip_address;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Validate IP Address
+ *
+ * @access public
+ * @param string
+ * @return string
+ */
+ function valid_ip($ip)
+ {
+ return ( ! preg_match( "/^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$/", $ip)) ? FALSE : TRUE;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * User Agent
+ *
+ * @access public
+ * @return string
+ */
+ function user_agent()
+ {
+ if ($this->user_agent !== FALSE)
+ {
+ return $this->user_agent;
+ }
+
+ $this->user_agent = ( ! isset($_SERVER['HTTP_USER_AGENT'])) ? FALSE : $_SERVER['HTTP_USER_AGENT'];
+
+ return $this->user_agent;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * XSS Clean
+ *
+ * Sanitizes data so that Cross Site Scripting Hacks can be
+ * prevented.  This function does a fair amount of work but
+ * it is extremely thorough, designed to prevent even the
+ * most obscure XSS attempts.  Nothing is ever 100% foolproof,
+ * of course, but I haven't been able to get anything passed
+ * the filter.
+ *
+ * Note: This function should only be used to deal with data
+ * upon submission.  It's not something that should
+ * be used for general runtime processing.
+ *
+ * This function was based in part on some code and ideas I
+ * got from Bitflux: http://blog.bitflux.ch/wiki/XSS_Prevention
+ *
+ * To help develop this script I used this great list of
+ * vulnerabilities along with a few other hacks I've
+ * harvested from examining vulnerabilities in other programs:
+ * http://ha.ckers.org/xss.html
+ *
+ * @access public
+ * @param string
+ * @return string
+ */
+ function xss_clean($str, $charset = 'ISO-8859-1')
+ {
+ /*
+ * Remove Null Characters
+ *
+ * This prevents sandwiching null characters
+ * between ascii characters, like Java\0script.
+ *
+ */
+ $str = preg_replace('/\0+/', '', $str);
+ $str = preg_replace('/(\\\\0)+/', '', $str);
+
+ /*
+ * Validate standard character entities
+ *
+ * Add a semicolon if missing. We do this to enable
+ * the conversion of entities to ASCII later.
+ *
+ */
+ $str = preg_replace('#(&\#*\w+)[\x00-\x20]+;#u',"\\1;",$str);
+
+ /*
+ * Validate UTF16 two byte encoding (x00)
+ *
+ * Just as above, adds a semicolon if missing.
+ *
+ */
+ $str = preg_replace('#(&\#x*)([0-9A-F]+);*#iu',"\\1\\2;",$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: Normally urldecode() would be easier but it removes plus signs
+ *
+ */
+ $str = preg_replace("/%u0([a-z0-9]{3})/i", "&#x\\1;", $str);
+ $str = preg_replace("/%([a-z0-9]{2})/i", "&#x\\1;", $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.
+ *
+ */
+ if (preg_match_all("/<(.+?)>/si", $str, $matches))
+ {
+ for ($i = 0; $i < count($matches['0']); $i++)
+ {
+ $str = str_replace($matches['1'][$i],
+ $this->_html_entity_decode($matches['1'][$i], $charset),
+ $str);
+ }
+ }
+
+ /*
+ * Not Allowed Under Any Conditions
+ */
+ $bad = array(
+ 'document.cookie' => '[removed]',
+ 'document.write' => '[removed]',
+ 'window.location' => '[removed]',
+ "javascript\s*:" => '[removed]',
+ "Redirect\s+302" => '[removed]',
+ '<!--' => '&lt;!--',
+ '-->' => '--&gt;'
+ );
+
+ foreach ($bad as $key => $val)
+ {
+ $str = preg_replace("#".$key."#i", $val, $str);
+ }
+
+ /*
+ * Convert all tabs to spaces
+ *
+ * This prevents strings like this: ja vascript
+ * Note: we deal with spaces between characters later.
+ *
+ */
+ $str = preg_replace("#\t+#", " ", $str);
+
+ /*
+ * Makes PHP tags safe
+ *
+ * Note: XML tags are inadvertently replaced too:
+ *
+ * <?xml
+ *
+ * But it doesn't seem to pose a problem.
+ *
+ */
+ $str = str_replace(array('<?php', '<?PHP', '<?', '?>'), array('&lt;?php', '&lt;?PHP', '&lt;?', '?&gt;'), $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.
+ *
+ */
+ $words = array('javascript', 'vbscript', 'script', 'applet', 'alert', 'document', 'write', 'cookie', 'window');
+ foreach ($words as $word)
+ {
+ $temp = '';
+ for ($i = 0; $i < strlen($word); $i++)
+ {
+ $temp .= substr($word, $i, 1)."\s*";
+ }
+
+ $temp = substr($temp, 0, -3);
+ $str = preg_replace('#'.$temp.'#s', $word, $str);
+ $str = preg_replace('#'.ucfirst($temp).'#s', ucfirst($word), $str);
+ }
+
+ /*
+ * Remove disallowed Javascript in links or img tags
+ */
+ $str = preg_replace("#<a.+?href=.*?(alert\(|alert&\#40;|javascript\:|window\.|document\.|\.cookie|<script|<xss).*?\>.*?</a>#si", "", $str);
+ $str = preg_replace("#<img.+?src=.*?(alert\(|alert&\#40;|javascript\:|window\.|document\.|\.cookie|<script|<xss).*?\>#si", "", $str);
+ $str = preg_replace("#<(script|xss).*?\>#si", "", $str);
+
+ /*
+ * Remove JavaScript Event Handlers
+ *
+ * Note: This code is a little blunt. It removes
+ * the event handler and anything up to the closing >,
+ * but it's unlikely to be a problem.
+ *
+ */
+ $str = preg_replace('#(<[^>]+.*?)(onblur|onchange|onclick|onfocus|onload|onmouseover|onmouseup|onmousedown|onselect|onsubmit|onunload|onkeypress|onkeydown|onkeyup|onresize)[^>]*>#iU',"\\1>",$str);
+
+ /*
+ * 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: &lt;blink&gt;
+ *
+ */
+ $str = preg_replace('#<(/*\s*)(alert|applet|basefont|base|behavior|bgsound|blink|body|embed|expression|form|frameset|frame|head|html|ilayer|iframe|input|layer|link|meta|object|plaintext|style|script|textarea|title|xml|xss)([^>]*)>#is', "&lt;\\1\\2\\3&gt;", $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&#40;'some code'&#41;
+ *
+ */
+ $str = preg_replace('#(alert|cmd|passthru|eval|exec|system|fopen|fsockopen|file|file_get_contents|readfile|unlink)(\s*)\((.*?)\)#si', "\\1\\2&#40;\\3&#41;", $str);
+
+ /*
+ * Final clean up
+ *
+ * This adds a bit of extra precaution in case
+ * something got through the above filters
+ *
+ */
+ $bad = array(
+ 'document.cookie' => '[removed]',
+ 'document.write' => '[removed]',
+ 'window.location' => '[removed]',
+ "javascript\s*:" => '[removed]',
+ "Redirect\s+302" => '[removed]',
+ '<!--' => '&lt;!--',
+ '-->' => '--&gt;'
+ );
+
+ foreach ($bad as $key => $val)
+ {
+ $str = preg_replace("#".$key."#i", $val, $str);
+ }
+
+
+ log_message('debug', "XSS Filtering completed");
+ return $str;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * HTML Entities Decode
+ *
+ * This function is a replacement for html_entity_decode()
+ *
+ * In some versions of PHP the native function does not work
+ * when UTF-8 is the specified character set, so this gives us
+ * a work-around. More info here:
+ * http://bugs.php.net/bug.php?id=25670
+ *
+ * @access private
+ * @param string
+ * @param string
+ * @return string
+ */
+ /* -------------------------------------------------
+ /* Replacement for html_entity_decode()
+ /* -------------------------------------------------*/
+
+ /*
+ NOTE: html_entity_decode() has a bug in some PHP versions when UTF-8 is the
+ character set, and the PHP developers said they were not back porting the
+ fix to versions other than PHP 5.x.
+ */
+ function _html_entity_decode($str, $charset='ISO-8859-1')
+ {
+ if (stristr($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' OR version_compare(phpversion(), '5.0.0', '>=')))
+ {
+ $str = html_entity_decode($str, ENT_COMPAT, $charset);
+ $str = preg_replace('~&#x([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([0-9a-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;
+ }
+
+}
+// END Input class
?> \ No newline at end of file
generated by cgit v1.2.3-24-g4f1b (git 2.32.0) at 2024-11-02 05:06:38 +0100