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106 lines
3.9 KiB
Python
106 lines
3.9 KiB
Python
#!/usr/bin/env python
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"""
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$Id$
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Copyright (c) 2006-2011 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 lib.core.common import getFilteredPageContent
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from lib.core.common import removeDynamicContent
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from lib.core.common import wasLastRequestDBMSError
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from lib.core.common import wasLastRequestHTTPError
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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.exception import sqlmapNoneDataException
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from lib.core.settings import DEFAULT_PAGE_ENCODING
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from lib.core.settings import DIFF_TOLERANCE
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from lib.core.settings import MIN_RATIO
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from lib.core.settings import MAX_RATIO
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from lib.core.settings import LOWER_RATIO_BOUND
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from lib.core.settings import UPPER_RATIO_BOUND
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from lib.core.threads import getCurrentThreadData
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def comparison(page, getRatioValue=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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seqMatcher = getCurrentThreadData().seqMatcher
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seqMatcher.set_seq1(kb.pageTemplate)
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if page:
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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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condition = conf.string in page
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return condition if not getRatioValue else (MAX_RATIO if condition else MIN_RATIO)
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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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condition = re.search(conf.regexp, page, re.I | re.M) is not None
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return condition if not getRatioValue else (MAX_RATIO if condition else MIN_RATIO)
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# In case of an DBMS error page return None
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if kb.errorIsNone and (wasLastRequestDBMSError() or wasLastRequestHTTPError()):
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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:
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page = removeDynamicContent(page)
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seqMatcher.set_seq1(removeDynamicContent(kb.pageTemplate))
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if not pageLength:
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pageLength = len(page)
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if kb.nullConnection and pageLength:
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if not seqMatcher.a:
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errMsg = "problem occured while retrieving original page content "
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errMsg += "which prevents sqlmap from continuation. Please rerun, "
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errMsg += "and if the problem persists turn off any optimization switches"
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raise sqlmapNoneDataException, errMsg
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ratio = 1. * pageLength / len(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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# Preventing "Unicode equal comparison failed to convert both arguments to Unicode"
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# (e.g. if one page is PDF and the other is HTML)
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if isinstance(seqMatcher.a, str) and isinstance(page, unicode):
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page = page.encode(kb.pageEncoding or DEFAULT_PAGE_ENCODING)
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elif isinstance(seqMatcher.a, unicode) and isinstance(page, str):
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seqMatcher.a = seqMatcher.a.encode(kb.pageEncoding or DEFAULT_PAGE_ENCODING)
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seqMatcher.set_seq1(getFilteredPageContent(seqMatcher.a, True) if conf.textOnly else seqMatcher.a)
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seqMatcher.set_seq2(getFilteredPageContent(page, True) if conf.textOnly else page)
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if seqMatcher.a is None or seqMatcher.b is None:
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ratio = None
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else:
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ratio = round(seqMatcher.quick_ratio(), 3)
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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 kb.matchRatio is None:
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if ratio >= LOWER_RATIO_BOUND and ratio <= UPPER_RATIO_BOUND:
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kb.matchRatio = ratio
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logger.debug("setting match ratio for current parameter to %.3f" % kb.matchRatio)
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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 getRatioValue:
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return ratio
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elif ratio > UPPER_RATIO_BOUND:
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return True
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elif kb.matchRatio is None:
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return None
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else:
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return (ratio - kb.matchRatio) > DIFF_TOLERANCE
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