diff options
Diffstat (limited to 'system/core/Security.php')
| -rwxr-xr-x | system/core/Security.php | 66 |
1 files changed, 40 insertions, 26 deletions
diff --git a/system/core/Security.php b/system/core/Security.php index ee4f0a08d..60a64f358 100755 --- a/system/core/Security.php +++ b/system/core/Security.php @@ -95,7 +95,8 @@ class CI_Security { '-moz-binding' => '[removed]', '<!--' => '<!--', '-->' => '-->', - '<![CDATA[' => '<![CDATA[' + '<![CDATA[' => '<![CDATA[', + '<comment>' => '<comment>' ); /** @@ -181,7 +182,7 @@ class CI_Security { // Nothing should last forever unset($_COOKIE[$this->_csrf_cookie_name]); - $this->_csrf_hash = ''; + $this->_csrf_hash = ''; $this->_csrf_set_hash(); $this->csrf_set_cookie(); @@ -498,15 +499,7 @@ class CI_Security { { if ($this->_xss_hash == '') { - if (phpversion() >= 4.2) - { - mt_srand(); - } - else - { - mt_srand(hexdec(substr(md5(microtime()), -8)) & 0x7fffffff); - } - + mt_srand(); $this->_xss_hash = md5(time() + mt_rand(0, 1999999999)); } @@ -520,6 +513,12 @@ class CI_Security { * * This function is 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. + * * @param string * @param string * @return string @@ -536,11 +535,6 @@ class CI_Security { $charset = config_item('charset'); } - // 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)', $str); @@ -637,25 +631,45 @@ class CI_Security { protected function _remove_evil_attributes($str, $is_image) { // All javascript event handlers (e.g. onload, onclick, onmouseover), style, and xmlns - $evil_attributes = array('on\w*', 'style', 'xmlns'); + $evil_attributes = array('on\w*', 'style', 'xmlns', 'formaction'); if ($is_image === TRUE) { /* - * Adobe Photoshop puts XML metadata into JFIF images, + * 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); + $count = 0; + $attribs = array(); + + // 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], '/'); + } + + // 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], '/'); + } + // 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$5', $str, -1, $count); + } + + } while ($count); + return $str; } @@ -877,4 +891,4 @@ class CI_Security { } /* End of file Security.php */ -/* Location: ./system/core/Security.php */ +/* Location: ./system/core/Security.php */
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