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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 os
import string
from lib.core.common import singleTimeWarnMessage
from lib.core.enums import PRIORITY
__priority__ = PRIORITY.LOWEST
def dependencies():
singleTimeWarnMessage("tamper script '%s' is only meant to be run against ASP or ASP.NET web applications" % os.path.basename(__file__).split(".")[0])
def tamper(payload, **kwargs):
"""
Unicode-URL-encodes all characters in a given payload (not processing already encoded) (e.g. SELECT -> %u0053%u0045%u004C%u0045%u0043%u0054)
Requirement:
* ASP
* ASP.NET
Tested against:
* Microsoft SQL Server 2000
* Microsoft SQL Server 2005
* MySQL 5.1.56
* PostgreSQL 9.0.3
Notes:
* Useful to bypass weak web application firewalls that do not unicode URL-decode the request before processing it through their ruleset
>>> tamper('SELECT FIELD%20FROM TABLE')
'%u0053%u0045%u004C%u0045%u0043%u0054%u0020%u0046%u0049%u0045%u004C%u0044%u0020%u0046%u0052%u004F%u004D%u0020%u0054%u0041%u0042%u004C%u0045'
"""
retVal = payload
if payload:
retVal = ""
i = 0
while i < len(payload):
if payload[i] == '%' and (i < len(payload) - 2) and payload[i + 1:i + 2] in string.hexdigits and payload[i + 2:i + 3] in string.hexdigits:
retVal += "%%u00%s" % payload[i + 1:i + 3]
i += 3
else:
retVal += '%%u%.4X' % ord(payload[i])
i += 1
return retVal
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