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50 lines
1.2 KiB
Python
50 lines
1.2 KiB
Python
#!/usr/bin/env python
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"""
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Copyright (c) 2006-2018 sqlmap developers (http://sqlmap.org/)
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See the file 'LICENSE' for copying permission
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"""
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import random
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import re
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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.NORMAL
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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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Adds multiple spaces around SQL keywords
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Notes:
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* Useful to bypass very weak and bespoke web application firewalls
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that has poorly written permissive regular expressions
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Reference: https://www.owasp.org/images/7/74/Advanced_SQL_Injection.ppt
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>>> random.seed(0)
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>>> tamper('1 UNION SELECT foobar')
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'1 UNION SELECT foobar'
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"""
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retVal = payload
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if payload:
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words = set()
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for match in re.finditer(r"[A-Za-z_]+", payload):
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word = match.group()
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if word.upper() in kb.keywords:
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words.add(word)
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for word in words:
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retVal = re.sub("(?<=\W)%s(?=[^A-Za-z_(]|\Z)" % word, "%s%s%s" % (' ' * random.randrange(1, 4), word, ' ' * random.randrange(1, 4)), retVal)
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retVal = re.sub("(?<=\W)%s(?=[(])" % word, "%s%s" % (' ' * random.randrange(1, 4), word), retVal)
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return retVal
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