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removed menuaction check completly, as only missuse was setting currentapp from it, which get now checked

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improved _check_script_tag and added a lot of tests, thought not all tests really apply here, so low count of ~50% are not as bad
This commit is contained in:
Ralf Becker 2012-03-27 08:29:52 +00:00
parent bed5142764
commit b747f99fc6
2 changed files with 1130 additions and 8 deletions
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1080
phpgwapi/doc/xssAttacks.xml Normal file
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58
phpgwapi/inc/common_functions.inc.php
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@ -1314,16 +1314,17 @@ function _check_script_tag(&$var,$name='')
{
_check_script_tag($var[$key],$name.'['.$key.']');
}
else
elseif(strpos($val, '<') !== false) // speedup: ignore everything without <
{
if (preg_match('/<\/?[^>]*(iframe|script|onabort|onblur|onchange|onclick|ondblclick|onerror|onfocus|onkeydown|onkeypress|onkeyup|onload|onmousedown|onmousemove|onmouseout|onmouseover|onmouseup|onreset|onselect|onsubmit|onunload|javascript)+[^>]*>/i',$val))
static $preg = '/<\/?[^>]*\b(iframe|script|javascript|on(before)?(abort|blur|change|click|dblclick|error|focus|keydown|keypress|keyup|load|mousedown|mousemove|mouseout|mouseover|mouseup|reset|select|submit|unload))\b[^>]*>/i';
if (preg_match($preg,$val))
{
error_log(__FUNCTION__."(,$name) ${name}[$key] = ".$var[$key]);
$GLOBALS['egw_unset_vars'][$name.'['.$key.']'] = $var[$key];
// attempt to clean the thing
$var[$key] = $val = html::purify($val);
// check if we succeeded, if not drop the var anyway, keep the egw_unset_var in any case
if (preg_match('/<\/?[^>]*(iframe|script|onabort|onblur|onchange|onclick|ondblclick|onerror|onfocus|onkeydown|onkeypress|onkeyup|onload|onmousedown|onmousemove|onmouseout|onmouseover|onmouseup|onreset|onselect|onsubmit|onunload|javascript)+[^>]*>/i',$val))
if (preg_match($preg,$val))
{
error_log("*** _check_script_tag($name): unset(${name}[$key]) with value $val***");
unset($var[$key]);
@ -1336,6 +1337,52 @@ function _check_script_tag(&$var,$name='')
}
}
/* some _check_script_tag tests, should be commented out by default
if (isset($_SERVER['SCRIPT_FILENAME']) && $_SERVER['SCRIPT_FILENAME'] == __FILE__) // some tests
{
if (!defined('EGW_INCLUDE_ROOT'))
{
define(EGW_INCLUDE_ROOT, realpath(dirname(__FILE__).'/../..'));
define(EGW_API_INC, realpath(dirname(__FILE__)));
}
$total = $num_failed = 0;
$patterns = array(
// pattern => true: should fail, false: should not fail
'<script>alert(1)</script>' => true,
'<span onmouseover="alert(1)">blah</span>' => true,
'<a href="javascript:alert(1)">Click Me</a>' => true,
'If 1 < 2, what does that mean for description, if 2 > 1.' => false,
'If 1 < 2, what does that mean for a script, if 2 > 1.' => false, // false positive
);
foreach($patterns as $pattern => $should_fail)
{
$test = array($pattern);
unset($GLOBALS['egw_unset_vars']);
_check_script_tag($test,'test');
$failed = isset($GLOBALS['egw_unset_vars']) !== $should_fail;
++$total;
if ($failed) $num_failed++;
echo "<p style='color: ".($failed?'red':'black')."'> ".html::htmlspecialchars($pattern).' '.
(isset($GLOBALS['egw_unset_vars'])?'removed':'passed')."</p>";
}
// no all xss attack vectors from http://ha.ckers.org/xssAttacks.xml are relevant here! (needs interpretation)
$vectors = new SimpleXMLElement(file_get_contents('http://ha.ckers.org/xssAttacks.xml'));
foreach($vectors->attack as $attack)
{
$test = array((string)$attack->code);
unset($GLOBALS['egw_unset_vars']);
_check_script_tag($test, $attack->name);
$failed = !isset($GLOBALS['egw_unset_vars']);
++$total;
if ($failed) $num_failed++;
echo "<p><span style='color: ".($failed?'red':'black')."'>".html::htmlspecialchars($attack->name).": ".html::htmlspecialchars($attack->code)." ".
(isset($GLOBALS['egw_unset_vars'])?'removed':'passed').
"</span><br /><span style='color: gray'>".html::htmlspecialchars($attack->desc)."</span></p>";
}
die("<p>Tests finished: $num_failed / $total failed</p>");
}*/
foreach(array('_GET','_POST','_REQUEST','HTTP_GET_VARS','HTTP_POST_VARS') as $n => $where)
{
$pregs = array(
@ -1358,11 +1405,6 @@ foreach(array('_GET','_POST','_REQUEST','HTTP_GET_VARS','HTTP_POST_VARS') as $n
}
//if (is_array($GLOBALS['egw_unset_vars'])) { echo "egw_unset_vars=<pre>".htmlspecialchars(print_r($GLOBALS['egw_unset_vars'],true))."</pre>"; exit; }
// check menuaction and die if it contains something nasty or unexpected
if (isset($_GET['menuaction']) && !preg_match('/^[A-Za-z0-9_-]+\.[A-Za-z0-9_]+\.[A-Za-z0-9_]+(\.[A-Za-z0-9_]+)?$/',$_GET['menuaction']))
{
die('Invalid menuaction!');
}
// $GLOBALS[egw_info][flags][currentapp] and die if it contains something nasty or unexpected
if (isset($GLOBALS['egw_info']) && isset($GLOBALS['egw_info']['flags']) &&
isset($GLOBALS['egw_info']['flags']['currentapp']) && !preg_match('/^[A-Za-z0-9_-]+$/',$GLOBALS['egw_info']['flags']['currentapp']))