diff options
Diffstat (limited to 'system/core/Security.php')
| -rwxr-xr-x | system/core/Security.php | 83 |
1 files changed, 38 insertions, 45 deletions
diff --git a/system/core/Security.php b/system/core/Security.php index dcc680a11..65338ced3 100755 --- a/system/core/Security.php +++ b/system/core/Security.php @@ -33,6 +33,7 @@ class CI_Security { * @access protected */ protected $_xss_hash = ''; + /** * Random Hash for Cross Site Request Forgery Protection Cookie * @@ -40,6 +41,7 @@ class CI_Security { * @access protected */ protected $_csrf_hash = ''; + /** * Expiration time for Cross Site Request Forgery Protection Cookie * Defaults to two hours (in seconds) @@ -48,6 +50,7 @@ class CI_Security { * @access protected */ protected $_csrf_expire = 7200; + /** * Token name for Cross Site Request Forgery Protection Cookie * @@ -55,6 +58,7 @@ class CI_Security { * @access protected */ protected $_csrf_token_name = 'ci_csrf_token'; + /** * Cookie name for Cross Site Request Forgery Protection Cookie * @@ -62,12 +66,14 @@ class CI_Security { * @access protected */ protected $_csrf_cookie_name = 'ci_csrf_token'; + /** * List of never allowed strings * * @var array * @access protected */ + protected $_never_allowed_str = array( 'document.cookie' => '[removed]', 'document.write' => '[removed]', @@ -80,7 +86,6 @@ class CI_Security { '<![CDATA[' => '<![CDATA[' ); - /* never allowed, regex replacement */ /** * List of never allowed regex replacement * @@ -135,6 +140,16 @@ class CI_Security { 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[$this->_csrf_token_name]) OR ! isset($_COOKIE[$this->_csrf_cookie_name])) @@ -154,10 +169,11 @@ class CI_Security { // Nothing should last forever unset($_COOKIE[$this->_csrf_cookie_name]); + $this->_csrf_hash = ''; $this->_csrf_set_hash(); $this->csrf_set_cookie(); - log_message('debug', "CSRF token verified "); + log_message('debug', "CSRF token verified"); return $this; } @@ -172,7 +188,7 @@ class CI_Security { public function csrf_set_cookie() { $expire = time() + $this->_csrf_expire; - $secure_cookie = (config_item('cookie_secure') === TRUE) ? 1 : 0; + $secure_cookie = (bool) config_item('cookie_secure'); if ($secure_cookie) { @@ -369,16 +385,11 @@ class CI_Security { foreach ($words as $word) { - $temp = ''; - - for ($i = 0, $wordlen = strlen($word); $i < $wordlen; $i++) - { - $temp .= substr($word, $i, 1)."\s*"; - } + $word = implode("\s*", str_split($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" - $str = preg_replace_callback('#('.substr($temp, 0, -3).')(\W)#is', array($this, '_compact_exploded_words'), $str); + $str = preg_replace_callback('#('.substr($word, 0, -3).')(\W)#is', array($this, '_compact_exploded_words'), $str); } /* @@ -457,7 +468,7 @@ class CI_Security { if ($is_image === TRUE) { - return ($str == $converted_string) ? TRUE: FALSE; + return ($str === $converted_string) ? TRUE : FALSE; } log_message('debug', "XSS Filtering completed"); @@ -497,48 +508,30 @@ class CI_Security { * * This function is a replacement for html_entity_decode() * - * In some versions of PHP the native function does not work - * when UTF-8 is the specified character set, so this gives us - * a work-around. More info here: - * http://bugs.php.net/bug.php?id=25670 - * - * NOTE: html_entity_decode() has a bug in some PHP versions when UTF-8 is the - * character set, and the PHP developers said they were not back porting the - * fix to versions other than PHP 5.x. - * * @param string * @param string * @return string */ - public function entity_decode($str, $charset='UTF-8') + public function entity_decode($str, $charset = NULL) { - if (stristr($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')) + if (strpos($str, '&') === FALSE) { - $str = html_entity_decode($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); + return $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) + if (empty($charset)) { - $str = strtr($str, array_flip(get_html_translation_table(HTML_ENTITIES))); + $charset = config_item('charset'); } - 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. + $str = html_entity_decode($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); } // -------------------------------------------------------------------- @@ -862,14 +855,14 @@ class CI_Security { return $this->_csrf_hash = $_COOKIE[$this->_csrf_cookie_name]; } - return $this->_csrf_hash = md5(uniqid(rand(), TRUE)); + $this->_csrf_hash = md5(uniqid(rand(), TRUE)); + $this->csrf_set_cookie(); } return $this->_csrf_hash; } } -// END Security Class /* End of file Security.php */ -/* Location: ./system/libraries/Security.php */ +/* Location: ./system/core/Security.php */ |