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#!/usr/bin/env python
"""
Copyright (c) 2006-2025 sqlmap developers (https://sqlmap.org)
See the file 'LICENSE' for copying permission
"""
from lib.core.compat import xrange
from lib.core.enums import PRIORITY
__priority__ = PRIORITY.HIGHEST
def dependencies():
pass
def tamper(payload, **kwargs):
"""
Replaces instances like 'IFNULL(A, B)' with 'IF(ISNULL(A), B, A)' counterpart
Requirement:
* MySQL
* SQLite (possibly)
* SAP MaxDB (possibly)
Tested against:
* MySQL 5.0 and 5.5
Notes:
* Useful to bypass very weak and bespoke web application firewalls
that filter the IFNULL() function
>>> tamper('IFNULL(1, 2)')
'IF(ISNULL(1),2,1)'
"""
if payload and payload.find("IFNULL") > -1:
while payload.find("IFNULL(") > -1:
index = payload.find("IFNULL(")
depth = 1
comma, end = None, None
for i in xrange(index + len("IFNULL("), len(payload)):
if depth == 1 and payload[i] == ',':
comma = i
elif depth == 1 and payload[i] == ')':
end = i
break
elif payload[i] == '(':
depth += 1
elif payload[i] == ')':
depth -= 1
if comma and end:
_ = payload[index + len("IFNULL("):comma]
__ = payload[comma + 1:end].lstrip()
newVal = "IF(ISNULL(%s),%s,%s)" % (_, __, _)
payload = payload[:index] + newVal + payload[end + 1:]
else:
break
return payload
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