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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 3 | daniel-mar | 1 | <?php |
| 2 | |||
| 3 | // ATTENTION: This is a very simple XSS "Firewall". There ARE many other ways to do an XSS attack, so please don't rely on this script! |
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| 4 | |||
| 5 | $xxx_directories_need_anti_xss = array( |
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| 6 | '/home/' |
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| 7 | ); |
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| 8 | |||
| 9 | // --- |
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| 10 | |||
| 11 | function ___check_xss___($str) { |
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| 6 | daniel-mar | 12 | $ary = is_array($str) ? $str : array($str); |
| 13 | foreach ($ary as $str) { |
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| 14 | if ((stripos($str, '<svg') !== false) || (stripos($str, '<script') !== false)) { |
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| 15 | @header($_SERVER['SERVER_PROTOCOL'] . ' 500 Internal Server Error', true, 500); |
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| 16 | die('There is a problem with the data you have entered. Please write us an email if you think you received this message in error. info at viathinksoft.de'); |
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| 17 | } |
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| 3 | daniel-mar | 18 | } |
| 19 | } |
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| 20 | |||
| 21 | // --- |
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| 22 | |||
| 23 | $xxx_go = false; |
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| 24 | foreach ($xxx_directories_need_anti_xss as $xxx_directory_need_anti_xss) { |
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| 25 | if (strpos($_SERVER['SCRIPT_FILENAME'], $xxx_directory_need_anti_xss) === 0) { |
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| 26 | $xxx_go = true; |
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| 27 | } |
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| 28 | } |
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| 29 | unset($xxx_directories_need_anti_xss); |
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| 30 | unset($xxx_directory_need_anti_xss); |
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| 31 | if ($xxx_go) { |
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| 32 | if (isset($_SERVER['REQUEST_URI'])) ___check_xss___($_SERVER['REQUEST_URI']); |
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| 33 | if (isset($_SERVER['QUERY_STRING'])) ___check_xss___($_SERVER['QUERY_STRING']); |
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| 34 | if (isset($_SERVER['SCRIPT_URI'])) ___check_xss___($_SERVER['SCRIPT_URI']); |
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| 35 | if (isset($_SERVER['SCRIPT_URL'])) ___check_xss___($_SERVER['SCRIPT_URL']); |
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| 36 | if (isset($_SERVER['PHP_SELF'])) ___check_xss___($_SERVER['PHP_SELF']); |
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| 37 | |||
| 38 | # Warum so viele ___ ? Damit man auf keinen Fall ein GET/POST Argument mit diesen Variablen überschreibt! |
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| 39 | foreach ($_REQUEST as $___key___ => $___val___) { |
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| 40 | ___check_xss___($___val___); |
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| 41 | } |
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| 42 | unset($___key___); |
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| 43 | unset($___val___); |
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| 44 | } |
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| 45 | unset($xxx_go); |