/system/core/Security.php
PHP | 901 lines | 470 code | 85 blank | 346 comment | 18 complexity | a269359d961f4e00c9a26b2588cbfcbf MD5 | raw file
- <?php
- /**
- * CodeIgniter
- *
- * An open source application development framework for PHP 5.2.4 or newer
- *
- * NOTICE OF LICENSE
- *
- * Licensed under the Open Software License version 3.0
- *
- * This source file is subject to the Open Software License (OSL 3.0) that is
- * bundled with this package in the files license.txt / license.rst. It is
- * also available through the world wide web at this URL:
- * http://opensource.org/licenses/OSL-3.0
- * If you did not receive a copy of the license and are unable to obtain it
- * through the world wide web, please send an email to
- * licensing@ellislab.com so we can send you a copy immediately.
- *
- * @package CodeIgniter
- * @author EllisLab Dev Team
- * @copyright Copyright (c) 2008 - 2013, EllisLab, Inc. (http://ellislab.com/)
- * @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
- * @link http://codeigniter.com
- * @since Version 1.0
- * @filesource
- */
- defined('BASEPATH') OR exit('No direct script access allowed');
- /**
- * Security Class
- *
- * @package CodeIgniter
- * @subpackage Libraries
- * @category Security
- * @author EllisLab Dev Team
- * @link http://codeigniter.com/user_guide/libraries/security.html
- */
- class CI_Security {
- /**
- * XSS Hash
- *
- * Random Hash for protecting URLs.
- *
- * @var string
- */
- protected $_xss_hash = '';
- /**
- * CSRF Hash
- *
- * Random hash for Cross Site Request Forgery protection cookie
- *
- * @var string
- */
- protected $_csrf_hash = '';
- /**
- * CSRF Expire time
- *
- * Expiration time for Cross Site Request Forgery protection cookie.
- * Defaults to two hours (in seconds).
- *
- * @var int
- */
- protected $_csrf_expire = 7200;
- /**
- * CSRF Token name
- *
- * Token name for Cross Site Request Forgery protection cookie.
- *
- * @var string
- */
- protected $_csrf_token_name = 'ci_csrf_token';
- /**
- * CSRF Cookie name
- *
- * Cookie name for Cross Site Request Forgery protection cookie.
- *
- * @var string
- */
- protected $_csrf_cookie_name = 'ci_csrf_token';
- /**
- * List of never allowed strings
- *
- * @var array
- */
- protected $_never_allowed_str = array(
- 'document.cookie' => '[removed]',
- 'document.write' => '[removed]',
- '.parentNode' => '[removed]',
- '.innerHTML' => '[removed]',
- 'window.location' => '[removed]',
- '-moz-binding' => '[removed]',
- '<!--' => '<!--',
- '-->' => '-->',
- '<![CDATA[' => '<![CDATA[',
- '<comment>' => '<comment>'
- );
- /**
- * List of never allowed regex replacements
- *
- * @var array
- */
- protected $_never_allowed_regex = array(
- 'javascript\s*:',
- 'expression\s*(\(|&\#40;)', // CSS and IE
- 'vbscript\s*:', // IE, surprise!
- 'Redirect\s+302',
- "([\"'])?data\s*:[^\\1]*?base64[^\\1]*?,[^\\1]*?\\1?"
- );
- /**
- * Class constructor
- *
- * @return void
- */
- public function __construct()
- {
- // Is CSRF protection enabled?
- if (config_item('csrf_protection') === TRUE)
- {
- // CSRF config
- foreach (array('csrf_expire', 'csrf_token_name', 'csrf_cookie_name') as $key)
- {
- if (FALSE !== ($val = config_item($key)))
- {
- $this->{'_'.$key} = $val;
- }
- }
- // Append application specific cookie prefix
- if (config_item('cookie_prefix'))
- {
- $this->_csrf_cookie_name = config_item('cookie_prefix').$this->_csrf_cookie_name;
- }
- // Set the CSRF hash
- $this->_csrf_set_hash();
- }
- log_message('debug', 'Security Class Initialized');
- }
- // --------------------------------------------------------------------
- /**
- * CSRF Verify
- *
- * @return CI_Security
- */
- public function csrf_verify()
- {
- // If it's not a POST request we will set the CSRF cookie
- if (strtoupper($_SERVER['REQUEST_METHOD']) !== 'POST')
- {
- return $this->csrf_set_cookie();
- }
- // Check if URI has been whitelisted from CSRF checks
- if ($exclude_uris = config_item('csrf_exclude_uris'))
- {
- $uri = load_class('URI', 'core');
- if (in_array($uri->uri_string(), $exclude_uris))
- {
- return $this;
- }
- }
- // Do the tokens exist in both the _POST and _COOKIE arrays?
- if ( ! isset($_POST[$this->_csrf_token_name], $_COOKIE[$this->_csrf_cookie_name])
- OR $_POST[$this->_csrf_token_name] !== $_COOKIE[$this->_csrf_cookie_name]) // Do the tokens match?
- {
- $this->csrf_show_error();
- }
- // We kill this since we're done and we don't want to polute the _POST array
- unset($_POST[$this->_csrf_token_name]);
- // Regenerate on every submission?
- if (config_item('csrf_regenerate'))
- {
- // Nothing should last forever
- unset($_COOKIE[$this->_csrf_cookie_name]);
- $this->_csrf_hash = '';
- }
- $this->_csrf_set_hash();
- $this->csrf_set_cookie();
- log_message('debug', 'CSRF token verified');
- return $this;
- }
- // --------------------------------------------------------------------
- /**
- * CSRF Set Cookie
- *
- * @codeCoverageIgnore
- * @return CI_Security
- */
- public function csrf_set_cookie()
- {
- $expire = time() + $this->_csrf_expire;
- $secure_cookie = (bool) config_item('cookie_secure');
- if ($secure_cookie && ! is_https())
- {
- return FALSE;
- }
- setcookie(
- $this->_csrf_cookie_name,
- $this->_csrf_hash,
- $expire,
- config_item('cookie_path'),
- config_item('cookie_domain'),
- $secure_cookie,
- config_item('cookie_httponly')
- );
- log_message('debug', 'CRSF cookie Set');
- return $this;
- }
- // --------------------------------------------------------------------
- /**
- * Show CSRF Error
- *
- * @return void
- */
- public function csrf_show_error()
- {
- show_error('The action you have requested is not allowed.');
- }
- // --------------------------------------------------------------------
- /**
- * Get CSRF Hash
- *
- * @see CI_Security::$_csrf_hash
- * @return string CSRF hash
- */
- public function get_csrf_hash()
- {
- return $this->_csrf_hash;
- }
- // --------------------------------------------------------------------
- /**
- * Get CSRF Token Name
- *
- * @see CI_Security::$_csrf_token_name
- * @return string 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 method 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: Should only be used to deal with data upon submission.
- * It's not something that should be used for general
- * runtime processing.
- *
- * @link http://channel.bitflux.ch/wiki/XSS_Prevention
- * Based in part on some code and ideas from Bitflux.
- *
- * @link http://ha.ckers.org/xss.html
- * 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.
- *
- * @param string|string[] $str Input data
- * @param bool $is_image Whether the input is an image
- * @return string
- */
- public function xss_clean($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 and validate entities in URLs
- $str = $this->_validate_entities(remove_invisible_characters($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.
- */
- $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.
- */
- $words = array(
- 'javascript', 'expression', 'vbscript', 'script', 'base64',
- 'applet', 'alert', 'document', 'write', 'cookie', 'window'
- );
- foreach ($words as $word)
- {
- $word = implode('\s*', str_split($word)).'\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"
- $str = preg_replace_callback('#('.substr($word, 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|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);
- }
- log_message('debug', 'XSS Filtering completed');
- return $str;
- }
- // --------------------------------------------------------------------
- /**
- * XSS Hash
- *
- * Generates the XSS hash if needed and returns it.
- *
- * @see CI_Security::$_xss_hash
- * @return string XSS hash
- */
- public function xss_hash()
- {
- if ($this->_xss_hash === '')
- {
- mt_srand();
- $this->_xss_hash = md5(time() + mt_rand(0, 1999999999));
- }
- return $this->_xss_hash;
- }
- // --------------------------------------------------------------------
- /**
- * HTML Entities Decode
- *
- * A replacement for html_entity_decode()
- *
- * 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.
- *
- * @link http://php.net/html-entity-decode
- *
- * @param string $str Input
- * @param string $charset Character set
- * @return string
- */
- public function entity_decode($str, $charset = NULL)
- {
- if (strpos($str, '&') === FALSE)
- {
- return $str;
- }
- if (empty($charset))
- {
- $charset = config_item('charset');
- }
- do
- {
- $matches = $matches1 = 0;
- $str = html_entity_decode($str, ENT_COMPAT, $charset);
- $str = preg_replace('~&#x(0*[0-9a-f]{2,5})~ei', 'chr(hexdec("\\1"))', $str, -1, $matches);
- $str = preg_replace('~&#([0-9]{2,4})~e', 'chr(\\1)', $str, -1, $matches1);
- }
- while ($matches OR $matches1);
- return $str;
- }
- // --------------------------------------------------------------------
- /**
- * Sanitize Filename
- *
- * @param string $str Input file name
- * @param bool $relative_path Whether to preserve paths
- * @return string
- */
- public function sanitize_filename($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);
- do
- {
- $old = $str;
- $str = str_replace($bad, '', $str);
- }
- while ($old !== $str);
- return stripslashes($str);
- }
- // ----------------------------------------------------------------
- /**
- * Strip Image Tags
- *
- * @param string $str
- * @return string
- */
- public function strip_image_tags($str)
- {
- return preg_replace(array('#<img\s+.*?src\s*=\s*["\'](.+?)["\'].*?\>#', '#<img\s+.*?src\s*=\s*(.+?).*?\>#'), '\\1', $str);
- }
- // ----------------------------------------------------------------
- /**
- * Compact Exploded Words
- *
- * Callback method for xss_clean() to remove whitespace from
- * things like 'j a v a s c r i p t'.
- *
- * @used-by CI_Security::xss_clean()
- * @param array $matches
- * @return string
- */
- protected function _compact_exploded_words($matches)
- {
- return preg_replace('/\s+/s', '', $matches[1]).$matches[2];
- }
- // --------------------------------------------------------------------
- /**
- * Remove Evil HTML Attributes (like event handlers and style)
- *
- * It removes the evil attribute and either:
- *
- * - Everything up until a space. For example, everything between the pipes:
- *
- * <code>
- * <a |style=document.write('hello');alert('world');| class=link>
- * </code>
- *
- * - Everything inside the quotes. For example, everything between the pipes:
- *
- * <code>
- * <a |style="document.write('hello'); alert('world');"| class="link">
- * </code>
- *
- * @param string $str The string to check
- * @param bool $is_image Whether the input is an image
- * @return string The string with the evil attributes removed
- */
- protected function _remove_evil_attributes($str, $is_image)
- {
- // All javascript event handlers (e.g. onload, onclick, onmouseover), style, and xmlns
- $evil_attributes = array('on\w*', 'style', 'xmlns', 'formaction');
- if ($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 {
- $count = 0;
- $attribs = array();
- // find occurrences of illegal attribute strings with quotes (042 and 047 are octal quotes)
- preg_match_all('/('.implode('|', $evil_attributes).')\s*=\s*(\042|\047)([^\\2]*?)(\\2)/is', $str, $matches, PREG_SET_ORDER);
- foreach ($matches as $attr)
- {
- $attribs[] = preg_quote($attr[0], '/');
- }
- // find occurrences of illegal attribute strings without quotes
- preg_match_all('/('.implode('|', $evil_attributes).')\s*=\s*([^\s>]*)/is', $str, $matches, PREG_SET_ORDER);
- foreach ($matches as $attr)
- {
- $attribs[] = preg_quote($attr[0], '/');
- }
- // replace illegal attribute strings that are inside an html tag
- if (count($attribs) > 0)
- {
- $str = preg_replace('/(<?)(\/?[^><]+?)([^A-Za-z<>\-])(.*?)('.implode('|', $attribs).')(.*?)([\s><]?)([><]*)/i', '$1$2 $4$6$7$8', $str, -1, $count);
- }
- }
- while ($count);
- return $str;
- }
- // --------------------------------------------------------------------
- /**
- * Sanitize Naughty HTML
- *
- * Callback method for xss_clean() to remove naughty HTML elements.
- *
- * @used-by CI_Security::xss_clean()
- * @param array $matches
- * @return string
- */
- protected function _sanitize_naughty_html($matches)
- {
- return '<'.$matches[1].$matches[2].$matches[3] // encode opening brace
- // encode captured opening or closing brace to prevent recursive vectors:
- .str_replace(array('>', '<'), array('>', '<'), $matches[4]);
- }
- // --------------------------------------------------------------------
- /**
- * JS Link Removal
- *
- * Callback method 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.
- *
- * @used-by CI_Security::xss_clean()
- * @param array $match
- * @return string
- */
- protected function _js_link_removal($match)
- {
- return str_replace($match[1],
- preg_replace('#href=.*?(?:alert\(|alert&\#40;|javascript:|livescript:|mocha:|charset=|window\.|document\.|\.cookie|<script|<xss|data\s*:)#si',
- '',
- $this->_filter_attributes(str_replace(array('<', '>'), '', $match[1]))
- ),
- $match[0]);
- }
- // --------------------------------------------------------------------
- /**
- * JS Image Removal
- *
- * Callback method 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.
- *
- * @used-by CI_Security::xss_clean()
- * @param array $match
- * @return string
- */
- protected function _js_img_removal($match)
- {
- return str_replace($match[1],
- preg_replace('#src=.*?(?:alert\(|alert&\#40;|javascript:|livescript:|mocha:|charset=|window\.|document\.|\.cookie|<script|<xss|base64\s*,)#si',
- '',
- $this->_filter_attributes(str_replace(array('<', '>'), '', $match[1]))
- ),
- $match[0]);
- }
- // --------------------------------------------------------------------
- /**
- * Attribute Conversion
- *
- * @used-by CI_Security::xss_clean()
- * @param array $match
- * @return string
- */
- protected function _convert_attribute($match)
- {
- return str_replace(array('>', '<', '\\'), array('>', '<', '\\\\'), $match[0]);
- }
- // --------------------------------------------------------------------
- /**
- * Filter Attributes
- *
- * Filters tag attributes for consistency and safety.
- *
- * @used-by CI_Security::_js_img_removal()
- * @used-by CI_Security::_js_link_removal()
- * @param string $str
- * @return string
- */
- protected function _filter_attributes($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-by CI_Security::xss_clean()
- * @param array $match
- * @return string
- */
- protected function _decode_entity($match)
- {
- return $this->entity_decode($match[0], strtoupper(config_item('charset')));
- }
- // --------------------------------------------------------------------
- /**
- * Validate URL entities
- *
- * @used-by CI_Security::xss_clean()
- * @param string $str
- * @return string
- */
- protected function _validate_entities($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;', $str);
- /*
- * Un-Protect GET variables in URLs
- */
- return str_replace($this->xss_hash(), '&', $str);
- }
- // ----------------------------------------------------------------------
- /**
- * Do Never Allowed
- *
- * @used-by CI_Security::xss_clean()
- * @param string
- * @return string
- */
- protected function _do_never_allowed($str)
- {
- $str = str_replace(array_keys($this->_never_allowed_str), $this->_never_allowed_str, $str);
- foreach ($this->_never_allowed_regex as $regex)
- {
- $str = preg_replace('#'.$regex.'#is', '[removed]', $str);
- }
- return $str;
- }
- // --------------------------------------------------------------------
- /**
- * Set CSRF Hash and Cookie
- *
- * @return string
- */
- protected function _csrf_set_hash()
- {
- if ($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]) &&
- preg_match('#^[0-9a-f]{32}$#iS', $_COOKIE[$this->_csrf_cookie_name]) === 1)
- {
- return $this->_csrf_hash = $_COOKIE[$this->_csrf_cookie_name];
- }
- $this->_csrf_hash = md5(uniqid(rand(), TRUE));
- $this->csrf_set_cookie();
- }
- return $this->_csrf_hash;
- }
- }
- /* End of file Security.php */
- /* Location: ./system/core/Security.php */