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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
from lib.core.compat import xrange
from lib.core.enums import PRIORITY
__priority__ = PRIORITY.LOW
def dependencies():
pass
def tamper(payload, **kwargs):
"""
Replaces space character (' ') with a random blank character from a valid set of alternate characters
Tested against:
* Microsoft SQL Server 2005
* MySQL 4, 5.0 and 5.5
* Oracle 10g
* PostgreSQL 8.3, 8.4, 9.0
Notes:
* Useful to bypass several web application firewalls
>>> random.seed(0)
>>> tamper('SELECT id FROM users')
'SELECT%0Did%0CFROM%0Ausers'
"""
# ASCII table:
# TAB 09 horizontal TAB
# LF 0A new line
# FF 0C new page
# CR 0D carriage return
blanks = ("%09", "%0A", "%0C", "%0D")
retVal = payload
if payload:
retVal = ""
quote, doublequote, firstspace = False, False, False
for i in xrange(len(payload)):
if not firstspace:
if payload[i].isspace():
firstspace = True
retVal += random.choice(blanks)
continue
elif payload[i] == '\'':
quote = not quote
elif payload[i] == '"':
doublequote = not doublequote
elif payload[i] == ' ' and not doublequote and not quote:
retVal += random.choice(blanks)
continue
retVal += payload[i]
return retVal
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