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72 lines
2.1 KiB
72 lines
2.1 KiB
#!/usr/bin/env python
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"""
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Copyright (c) 2006-2024 sqlmap developers (https://sqlmap.org/)
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See the file 'doc/COPYING' for copying permission
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"""
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from lib.core.compat import xrange
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from lib.core.enums import PRIORITY
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from lib.core.settings import REPLACEMENT_MARKER
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__priority__ = PRIORITY.HIGHEST
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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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Replaces instances like 'IF(A, B, C)' with 'CASE WHEN (A) THEN (B) ELSE (C) END' counterpart
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Requirement:
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* MySQL
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* SQLite (possibly)
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* SAP MaxDB (possibly)
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Tested against:
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* MySQL 5.0 and 5.5
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Notes:
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* Useful to bypass very weak and bespoke web application firewalls
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that filter the IF() functions
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>>> tamper('IF(1, 2, 3)')
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'CASE WHEN (1) THEN (2) ELSE (3) END'
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>>> tamper('SELECT IF((1=1), (SELECT "foo"), NULL)')
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'SELECT CASE WHEN (1=1) THEN (SELECT "foo") ELSE (NULL) END'
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"""
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if payload and payload.find("IF") > -1:
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payload = payload.replace("()", REPLACEMENT_MARKER)
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while payload.find("IF(") > -1:
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index = payload.find("IF(")
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depth = 1
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commas, end = [], None
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for i in xrange(index + len("IF("), len(payload)):
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if depth == 1 and payload[i] == ',':
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commas.append(i)
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elif depth == 1 and payload[i] == ')':
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end = i
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break
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elif payload[i] == '(':
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depth += 1
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elif payload[i] == ')':
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depth -= 1
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if len(commas) == 2 and end:
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a = payload[index + len("IF("):commas[0]].strip("()")
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b = payload[commas[0] + 1:commas[1]].lstrip().strip("()")
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c = payload[commas[1] + 1:end].lstrip().strip("()")
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newVal = "CASE WHEN (%s) THEN (%s) ELSE (%s) END" % (a, b, c)
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payload = payload[:index] + newVal + payload[end + 1:]
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else:
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break
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payload = payload.replace(REPLACEMENT_MARKER, "()")
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return payload
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