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125 lines
4.3 KiB
Python
125 lines
4.3 KiB
Python
#!/usr/bin/env python
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"""
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$Id$
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Copyright (c) 2006-2010 sqlmap developers (http://sqlmap.sourceforge.net/)
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See the file 'doc/COPYING' for copying permission
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"""
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import re
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from difflib import SequenceMatcher
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from lib.core.common import wasLastRequestDBMSError
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from lib.core.data import conf
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from lib.core.data import kb
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from lib.core.data import logger
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from lib.core.settings import CONSTANT_RATIO
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from lib.core.settings import DIFF_TOLERANCE
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def comparison(page, headers=None, getSeqMatcher=False, pageLength=None):
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if page is None and pageLength is None:
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return None
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regExpResults = None
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if page:
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# String to be excluded before calculating page hash
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if conf.eString and conf.eString in page:
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index = page.index(conf.eString)
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length = len(conf.eString)
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pageWithoutString = page[:index]
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pageWithoutString += page[index+length:]
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page = pageWithoutString
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# Regular expression matches to be excluded before calculating page hash
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if conf.eRegexp:
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regExpResults = re.findall(conf.eRegexp, page, re.I | re.M)
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if regExpResults:
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for regExpResult in regExpResults:
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index = page.index(regExpResult)
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length = len(regExpResult)
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pageWithoutRegExp = page[:index]
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pageWithoutRegExp += page[index+length:]
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page = pageWithoutRegExp
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# String to match in page when the query is valid
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if conf.string:
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return conf.string in page
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# Regular expression to match in page when the query is valid
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if conf.regexp:
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return re.search(conf.regexp, page, re.I | re.M) is not None
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# In case of an DBMS error page return None
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if wasLastRequestDBMSError():
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return None
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# Dynamic content lines to be excluded before comparison
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if not kb.nullConnection and not conf.longestCommon:
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for item in kb.dynamicMarkings:
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prefix, suffix = item
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if prefix is None:
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page = re.sub('(?s)^.+%s' % suffix, suffix, page)
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elif suffix is None:
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page = re.sub('(?s)%s.+$' % prefix, prefix, page)
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else:
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page = re.sub('(?s)%s.+%s' % (prefix, suffix), '%s%s' % (prefix, suffix), page)
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if not pageLength:
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pageLength = len(page)
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if kb.locks.seqLock:
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kb.locks.seqLock.acquire()
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if conf.longestCommon:
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(firstPage, secondPage) = (conf.seqMatcher.a, page)
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match = SequenceMatcher(None, firstPage, secondPage).find_longest_match(0, len(firstPage), 0, len(secondPage))
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ratio = round(SequenceMatcher(None, firstPage[match[0]:match[0]+match[2]], secondPage[match[1]:match[1]+match[2]]).ratio(), 3)
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elif not conf.eRegexp and not conf.eString and kb.nullConnection and pageLength:
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ratio = 1. * pageLength / len(conf.seqMatcher.a)
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if ratio > 1.:
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ratio = 1. / ratio
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else:
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conf.seqMatcher.set_seq2(page)
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ratio = round(conf.seqMatcher.ratio(), 3)
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if kb.locks.seqLock:
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kb.locks.seqLock.release()
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# If the url is stable and we did not set yet the match ratio and the
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# current injected value changes the url page content
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if conf.matchRatio is None:
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if conf.thold:
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conf.matchRatio = conf.thold
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elif kb.pageStable and ratio > 0.6 and ratio < 1:
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conf.matchRatio = ratio
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logger.debug("setting match ratio for current parameter to %.3f" % conf.matchRatio)
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elif not kb.pageStable or ( kb.pageStable and ratio < 0.6 ):
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conf.matchRatio = CONSTANT_RATIO
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logger.debug("setting match ratio for current parameter to default value 0.900")
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# If it has been requested to return the ratio and not a comparison
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# response
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if getSeqMatcher:
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return ratio
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elif ratio == 1:
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return True
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elif conf.matchRatio is None:
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return None
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else:
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if conf.matchRatio == CONSTANT_RATIO or conf.thold:
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return ratio > conf.matchRatio
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else:
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return (ratio - conf.matchRatio) > DIFF_TOLERANCE
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