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98 lines
3.3 KiB
Python
98 lines
3.3 KiB
Python
#!/usr/bin/env python2
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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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import os
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import re
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from lib.core.common import singleTimeWarnMessage
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from lib.core.common import zeroDepthSearch
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from lib.core.enums import DBMS
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from lib.core.enums import PRIORITY
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__priority__ = PRIORITY.HIGHEST
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def dependencies():
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singleTimeWarnMessage("tamper script '%s' is only meant to be run against %s" % (os.path.basename(__file__).split(".")[0], DBMS.MSSQL))
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def tamper(payload, **kwargs):
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"""
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Replaces plus operator ('+') with (MsSQL) ODBC function {fn CONCAT()} counterpart
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Tested against:
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* Microsoft SQL Server 2008
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Requirements:
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* Microsoft SQL Server 2008+
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Notes:
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* Useful in case ('+') character is filtered
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* https://msdn.microsoft.com/en-us/library/bb630290.aspx
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>>> tamper('SELECT CHAR(113)+CHAR(114)+CHAR(115) FROM DUAL')
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'SELECT {fn CONCAT({fn CONCAT(CHAR(113),CHAR(114))},CHAR(115))} FROM DUAL'
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>>> tamper('SELECT (CHAR(113)+CHAR(114)+CHAR(115)) FROM DUAL')
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'SELECT {fn CONCAT({fn CONCAT(CHAR(113),CHAR(114))},CHAR(115))} FROM DUAL'
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"""
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retVal = payload
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if payload:
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prefix, suffix = '+' * len(re.search(r"\A(\+*)", payload).group(0)), '+' * len(re.search(r"(\+*)\Z", payload).group(0))
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retVal = retVal.strip('+')
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while True:
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indexes = zeroDepthSearch(retVal, '+')
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if indexes:
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first, last = 0, 0
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for i in xrange(1, len(indexes)):
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if ' ' in retVal[indexes[0]:indexes[i]]:
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break
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else:
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last = i
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start = retVal[:indexes[first]].rfind(' ') + 1
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end = (retVal[indexes[last] + 1:].find(' ') + indexes[last] + 1) if ' ' in retVal[indexes[last] + 1:] else len(retVal) - 1
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count = 0
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chars = [char for char in retVal]
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for index in indexes[first:last + 1]:
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if count == 0:
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chars[index] = ','
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else:
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chars[index] = '\x01'
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count += 1
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retVal = "%s%s%s)}%s" % (retVal[:start], "{fn CONCAT(" * count, ''.join(chars)[start:end].replace('\x01', ")},"), retVal[end:])
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else:
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match = re.search(r"\((CHAR\(\d+.+\bCHAR\(\d+\))\)", retVal)
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if match:
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part = match.group(0)
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indexes = set(zeroDepthSearch(match.group(1), '+'))
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if not indexes:
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break
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count = 0
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chars = [char for char in part]
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for i in xrange(1, len(chars)):
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if i - 1 in indexes:
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if count == 0:
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chars[i] = ','
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else:
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chars[i] = '\x01'
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count += 1
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replacement = "%s%s}" % (("{fn CONCAT(" * count)[:-1], "".join(chars).replace('\x01', ")},"))
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retVal = retVal.replace(part, replacement)
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else:
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break
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retVal = "%s%s%s" % (prefix, retVal, suffix)
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return retVal
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