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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 re
from lib.core.common import randomRange
from lib.core.compat import xrange
from lib.core.data import kb
from lib.core.enums import PRIORITY
__priority__ = PRIORITY.NORMAL
def dependencies():
pass
def tamper(payload, **kwargs):
"""
Replaces each keyword character with random case value (e.g. SELECT -> SEleCt)
Tested against:
* Microsoft SQL Server 2005
* MySQL 4, 5.0 and 5.5
* Oracle 10g
* PostgreSQL 8.3, 8.4, 9.0
* SQLite 3
Notes:
* Useful to bypass very weak and bespoke web application firewalls
that has poorly written permissive regular expressions
* This tamper script should work against all (?) databases
>>> import random
>>> random.seed(0)
>>> tamper('INSERT')
'InSeRt'
>>> tamper('f()')
'f()'
>>> tamper('function()')
'FuNcTiOn()'
>>> tamper('SELECT id FROM `user`')
'SeLeCt id FrOm `user`'
"""
retVal = payload
if payload:
for match in re.finditer(r"\b[A-Za-z_]{2,}\b", retVal):
word = match.group()
if (word.upper() in kb.keywords and re.search(r"(?i)[`\"'\[]%s[`\"'\]]" % word, retVal) is None) or ("%s(" % word) in payload:
while True:
_ = ""
for i in xrange(len(word)):
_ += word[i].upper() if randomRange(0, 1) else word[i].lower()
if len(_) > 1 and _ not in (_.lower(), _.upper()):
break
retVal = retVal.replace(word, _)
return retVal
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