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Enhance WAF and dol_sanitizeUrl

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This commit is contained in:
Laurent Destailleur 2021-03-14 18:57:18 +01:00
parent bd838d0b8a
commit 45579edd43
4 changed files with 42 additions and 16 deletions
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27
htdocs/core/lib/functions.lib.php
View File

@ -613,7 +613,13 @@ function GETPOST($paramname, $check = 'alphanohtml', $method = 0, $filter = null
// Sanitizing for special parameters. There is no reason to allow the backtopage parameter to contains an external URL.
if ($paramname == 'backtopage' || $paramname == 'backtolist') {
$out = str_replace('\\', '/', $out);
$out = str_replace(array(':', '@'), '', $out);
$out = str_replace(array(':', ';', '@'), '', $out);
do {
$oldstringtoclean = $out;
$out = str_ireplace(array('javascript', 'vbscript', '&colon', '&#x3a'), '', $out);
} while ($oldstringtoclean != $out);
$out = preg_replace(array('/^[a-z]*\/\/+/i'), '', $out);
}
@ -1010,20 +1016,20 @@ function dol_sanitizePathName($str, $newstr = '_', $unaccent = 1)
function dol_sanitizeUrl($stringtoclean, $type = 1)
{
// We clean string because some hacks try to obfuscate evil strings by inserting non printable chars. Example: 'java(ascci09)scr(ascii00)ipt' is processed like 'javascript' (whatever is place of evil ascii char)
// We should use dol_string_nounprintableascii but function is not yet loaded/available
// We should use dol_string_nounprintableascii but function may not be yet loaded/available
$stringtoclean = preg_replace('/[\x00-\x1F\x7F]/u', '', $stringtoclean); // /u operator makes UTF8 valid characters being ignored so are not included into the replace
// We clean html comments because some hacks try to obfuscate evil strings by inserting HTML comments. Example: on<!-- -->error=alert(1)
$stringtoclean = preg_replace('/<!--[^>]*-->/', '', $stringtoclean);
$stringtoclean = str_replace('\\', '/', $stringtoclean);
$stringtoclean = str_replace(array(':', '@'), '', $stringtoclean);
if ($type == 1) {
$stringtoclean = str_replace(array(':', ';', '@'), '', $stringtoclean);
}
do {
$oldstringtoclean = $stringtoclean;
$stringtoclean = str_replace(array('javascript', 'vbscript'), '', $stringtoclean);
if ($type == 1) {
$stringtoclean = str_replace(array(':', '&colon', ';'), '', $stringtoclean);
}
$stringtoclean = str_ireplace(array('javascript', 'vbscript', '&colon', '&#x3a'), '', $stringtoclean);
} while ($oldstringtoclean != $stringtoclean);
if ($type == 1) {
@ -6240,10 +6246,11 @@ function dol_string_onlythesehtmltags($stringtoclean, $cleanalsosomestyles = 1,
$stringtoclean = str_replace('<!DOCTYPE html>', '__!DOCTYPE_HTML__', $stringtoclean); // Replace DOCTYPE to avoid to have it removed by the strip_tags
$stringtoclean = dol_string_nounprintableascii($stringtoclean, 0);
$stringtoclean = preg_replace('/&colon;/i', ':', $stringtoclean);
$stringtoclean = preg_replace('/<!--[^>]*-->/', '', $stringtoclean);
$stringtoclean = preg_replace('/&#58;|&#0000058|&#x3A/i', '', $stringtoclean); // refused string ':' encoded (no reason to have it encoded) to lock 'javascript:...'
$stringtoclean = preg_replace('/&colon;/i', ':', $stringtoclean);
$stringtoclean = preg_replace('/&#58;|&#0+58|&#x3A/i', '', $stringtoclean); // refused string ':' encoded (no reason to have a : encoded like this) to disable 'javascript:...'
$stringtoclean = preg_replace('/javascript\s*:/i', '', $stringtoclean);
$temp = strip_tags($stringtoclean, $allowed_tags_string);
@ -6256,7 +6263,7 @@ function dol_string_onlythesehtmltags($stringtoclean, $cleanalsosomestyles = 1,
}
// Remove 'javascript:' that we should not find into a text with
// Warning: This is not reliable to fight against obfuscated javascript, there is a lot of other solution to include js into a common html tag (only filtered by the GETPOST).
// Warning: This is not reliable to fight against obfuscated javascript, there is a lot of other solution to include js into a common html tag (only filtered by a GETPOST(.., powerfullfilter)).
if ($cleanalsojavascript) {
$temp = preg_replace('/javascript\s*:/i', '', $temp);
}

2
htdocs/main.inc.php
View File

@ -68,7 +68,7 @@ function testSqlAndScriptInject($val, $type)
$oldval = $val;
$val = html_entity_decode($val, ENT_QUOTES | ENT_HTML5);
} while ($oldval != $val);
//print "after decoding $val\n";
//print "after decoding $val\n";
// We clean string because some hacks try to obfuscate evil strings by inserting non printable chars. Example: 'java(ascci09)scr(ascii00)ipt' is processed like 'javascript' (whatever is place of evil ascii char)
// We should use dol_string_nounprintableascii but function is not yet loaded/available

2
htdocs/product/class/productcustomerprice.class.php
View File

@ -455,7 +455,7 @@ class Productcustomerprice extends CommonObject
$line->socname = $obj->socname;
$line->prodref = $obj->prodref;
$this->lines [] = $line;
$this->lines[] = $line;
}
$this->db->free($resql);

27
test/phpunit/SecurityTest.php
View File

@ -207,7 +207,7 @@ class SecurityTest extends PHPUnit\Framework\TestCase
$test = 'javascript&colon&#x3B;alert(1)';
$result=testSqlAndScriptInject($test, 0);
$this->assertEquals($expectedresult, $result, 'Error on testSqlAndScriptInject expected 1b');
$this->assertEquals($expectedresult, $result, 'Error on testSqlAndScriptInject expected 1a');
$test="<img src='1.jpg' onerror =javascript:alert('XSS')>";
$result=testSqlAndScriptInject($test, 0);
@ -327,7 +327,8 @@ class SecurityTest extends PHPUnit\Framework\TestCase
$_POST["param10"]='is_object($object) ? ($object->id < 10 ? round($object->id / 2, 2) : (2 * $user->id) * (int) substr($mysoc->zip, 1, 2)) : \'<abc>objnotdefined\'';
$_POST["param11"]=' Name <email@email.com> ';
$_POST["param12"]='<!DOCTYPE html><html>aaa</html>';
$_POST["param13"]='javascript%26colon%26%23x3B%3Balert(1)';
//$_POST["param13"]='javascript%26colon%26%23x3B%3Balert(1)';
//$_POST["param14"]='javascripT&javascript#x3a alert(1)';
$result=GETPOST('id', 'int'); // Must return nothing
print __METHOD__." result=".$result."\n";
@ -436,6 +437,15 @@ class SecurityTest extends PHPUnit\Framework\TestCase
print __METHOD__." result=".$result."\n";
$this->assertEquals(trim($_POST["param12"]), $result, 'Test a string with DOCTYPE and restricthtml');
/*$result=GETPOST("param13", 'alphanohtml');
print __METHOD__." result=".$result."\n";
$this->assertEquals(trim($_POST["param13"]), $result, 'Test a string and alphanohtml');
$result=GETPOST("param14", 'alphanohtml');
print __METHOD__." result=".$result."\n";
$this->assertEquals(trim($_POST["param14"]), $result, 'Test a string and alphanohtml');
*/
// Special test for GETPOST of backtopage or backtolist parameter
$_POST["backtopage"]='//www.google.com';
@ -463,6 +473,11 @@ class SecurityTest extends PHPUnit\Framework\TestCase
print __METHOD__." result=".$result."\n";
$this->assertEquals('/mydir/mypage.php?aa=a%10a', $result, 'Test for backtopage param');
$_POST["backtopage"]='javascripT&javascript#javascriptxjavascript3a alert(1)';
$result=GETPOST("backtopage");
print __METHOD__." result=".$result."\n";
$this->assertEquals(' alert(1)', $result, 'Test for backtopage param');
return $result;
}
@ -674,13 +689,17 @@ class SecurityTest extends PHPUnit\Framework\TestCase
$langs=$this->savlangs;
$db=$this->savdb;
$test = 'javascripT&javascript#x3a alert(1)';
$result=dol_sanitizeUrl($test);
$this->assertEquals(' alert(1)', $result, 'Test on dol_sanitizeUrl A');
$test = 'javajavascriptscript&cjavascriptolon;alert(1)';
$result=dol_sanitizeUrl($test);
$this->assertEquals('alert(1)', $result, 'Test on dol_sanitizeUrl');
$this->assertEquals('alert(1)', $result, 'Test on dol_sanitizeUrl B');
$test = '/javas:cript/google.com';
$result=dol_sanitizeUrl($test);
$this->assertEquals('google.com', $result, 'Test on dol_sanitizeUrl');
$this->assertEquals('google.com', $result, 'Test on dol_sanitizeUrl C');
}
/**