mirror of
https://github.com/sqlmapproject/sqlmap.git
synced 2024-11-22 09:36:35 +03:00
72 lines
2.1 KiB
Python
72 lines
2.1 KiB
Python
#!/usr/bin/env python
|
|
|
|
"""
|
|
Copyright (c) 2006-2023 sqlmap developers (https://sqlmap.org/)
|
|
See the file 'doc/COPYING' for copying permission
|
|
"""
|
|
|
|
from lib.core.compat import xrange
|
|
from lib.core.enums import PRIORITY
|
|
from lib.core.settings import REPLACEMENT_MARKER
|
|
|
|
__priority__ = PRIORITY.HIGHEST
|
|
|
|
def dependencies():
|
|
pass
|
|
|
|
def tamper(payload, **kwargs):
|
|
"""
|
|
Replaces instances like 'IF(A, B, C)' with 'CASE WHEN (A) THEN (B) ELSE (C) END' 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 IF() functions
|
|
|
|
>>> tamper('IF(1, 2, 3)')
|
|
'CASE WHEN (1) THEN (2) ELSE (3) END'
|
|
>>> tamper('SELECT IF((1=1), (SELECT "foo"), NULL)')
|
|
'SELECT CASE WHEN (1=1) THEN (SELECT "foo") ELSE (NULL) END'
|
|
"""
|
|
|
|
if payload and payload.find("IF") > -1:
|
|
payload = payload.replace("()", REPLACEMENT_MARKER)
|
|
while payload.find("IF(") > -1:
|
|
index = payload.find("IF(")
|
|
depth = 1
|
|
commas, end = [], None
|
|
|
|
for i in xrange(index + len("IF("), len(payload)):
|
|
if depth == 1 and payload[i] == ',':
|
|
commas.append(i)
|
|
|
|
elif depth == 1 and payload[i] == ')':
|
|
end = i
|
|
break
|
|
|
|
elif payload[i] == '(':
|
|
depth += 1
|
|
|
|
elif payload[i] == ')':
|
|
depth -= 1
|
|
|
|
if len(commas) == 2 and end:
|
|
a = payload[index + len("IF("):commas[0]].strip("()")
|
|
b = payload[commas[0] + 1:commas[1]].lstrip().strip("()")
|
|
c = payload[commas[1] + 1:end].lstrip().strip("()")
|
|
newVal = "CASE WHEN (%s) THEN (%s) ELSE (%s) END" % (a, b, c)
|
|
payload = payload[:index] + newVal + payload[end + 1:]
|
|
else:
|
|
break
|
|
|
|
payload = payload.replace(REPLACEMENT_MARKER, "()")
|
|
|
|
return payload
|