sqlmap/lib/core/target.py

#!/usr/bin/env python

"""
Copyright (c) 2006-2017 sqlmap developers (http://sqlmap.org/)
See the file 'doc/COPYING' for copying permission
"""

import codecs
import functools
import os
import re
import subprocess
import sys
import tempfile
import time
import urlparse

from lib.core.common import Backend
from lib.core.common import getSafeExString
from lib.core.common import getUnicode
from lib.core.common import hashDBRetrieve
from lib.core.common import intersect
from lib.core.common import normalizeUnicode
from lib.core.common import openFile
from lib.core.common import paramToDict
from lib.core.common import randomStr
from lib.core.common import readInput
from lib.core.common import resetCookieJar
from lib.core.common import urldecode
from lib.core.data import conf
from lib.core.data import kb
from lib.core.data import logger
from lib.core.data import mergedOptions
from lib.core.data import paths
from lib.core.datatype import InjectionDict
from lib.core.dicts import DBMS_DICT
from lib.core.dump import dumper
from lib.core.enums import HASHDB_KEYS
from lib.core.enums import HTTP_HEADER
from lib.core.enums import HTTPMETHOD
from lib.core.enums import MKSTEMP_PREFIX
from lib.core.enums import PLACE
from lib.core.enums import POST_HINT
from lib.core.exception import SqlmapFilePathException
from lib.core.exception import SqlmapGenericException
from lib.core.exception import SqlmapMissingPrivileges
from lib.core.exception import SqlmapSystemException
from lib.core.exception import SqlmapUserQuitException
from lib.core.option import _setDBMS
from lib.core.option import _setKnowledgeBaseAttributes
from lib.core.option import _setAuthCred
from lib.core.settings import ASTERISK_MARKER
from lib.core.settings import CSRF_TOKEN_PARAMETER_INFIXES
from lib.core.settings import CUSTOM_INJECTION_MARK_CHAR
from lib.core.settings import DEFAULT_GET_POST_DELIMITER
from lib.core.settings import HOST_ALIASES
from lib.core.settings import ARRAY_LIKE_RECOGNITION_REGEX
from lib.core.settings import JSON_RECOGNITION_REGEX
from lib.core.settings import JSON_LIKE_RECOGNITION_REGEX
from lib.core.settings import MULTIPART_RECOGNITION_REGEX
from lib.core.settings import PROBLEMATIC_CUSTOM_INJECTION_PATTERNS
from lib.core.settings import REFERER_ALIASES
from lib.core.settings import RESTORE_MERGED_OPTIONS
from lib.core.settings import RESULTS_FILE_FORMAT
from lib.core.settings import SUPPORTED_DBMS
from lib.core.settings import UNENCODED_ORIGINAL_VALUE
from lib.core.settings import UNICODE_ENCODING
from lib.core.settings import UNKNOWN_DBMS_VERSION
from lib.core.settings import URI_INJECTABLE_REGEX
from lib.core.settings import USER_AGENT_ALIASES
from lib.core.settings import XML_RECOGNITION_REGEX
from lib.utils.hashdb import HashDB
from thirdparty.odict.odict import OrderedDict

def _setRequestParams():
    """
    Check and set the parameters and perform checks on 'data' option for
    HTTP method POST.
    """

    if conf.direct:
        conf.parameters[None] = "direct connection"
        return

    testableParameters = False

    # Perform checks on GET parameters
    if conf.parameters.get(PLACE.GET):
        parameters = conf.parameters[PLACE.GET]
        paramDict = paramToDict(PLACE.GET, parameters)

        if paramDict:
            conf.paramDict[PLACE.GET] = paramDict
            testableParameters = True

    # Perform checks on POST parameters
    if conf.method == HTTPMETHOD.POST and conf.data is None:
        logger.warn("detected empty POST body")
        conf.data = ""

    if conf.data is not None:
        conf.method = HTTPMETHOD.POST if not conf.method or conf.method == HTTPMETHOD.GET else conf.method
        hintNames = []

        def process(match, repl):
            retVal = match.group(0)

            if not (conf.testParameter and match.group("name") not in conf.testParameter):
                retVal = repl
                while True:
                    _ = re.search(r"\\g<([^>]+)>", retVal)
                    if _:
                        retVal = retVal.replace(_.group(0), match.group(int(_.group(1)) if _.group(1).isdigit() else _.group(1)))
                    else:
                        break
                if CUSTOM_INJECTION_MARK_CHAR in retVal:
                    hintNames.append((retVal.split(CUSTOM_INJECTION_MARK_CHAR)[0], match.group("name")))
            return retVal

        if kb.processUserMarks is None and CUSTOM_INJECTION_MARK_CHAR in conf.data:
            message = "custom injection marking character ('%s') found in option " % CUSTOM_INJECTION_MARK_CHAR
            message += "'--data'. Do you want to process it? [Y/n/q] "
            choice = readInput(message, default='Y')

            if choice == 'Q':
                raise SqlmapUserQuitException
            else:
                kb.processUserMarks = choice == 'Y'

                if kb.processUserMarks:
                    kb.testOnlyCustom = True

        if re.search(JSON_RECOGNITION_REGEX, conf.data):
            message = "JSON data found in %s data. " % conf.method
            message += "Do you want to process it? [Y/n/q] "
            choice = readInput(message, default='Y')

            if choice == 'Q':
                raise SqlmapUserQuitException
            elif choice == 'Y':
                if not (kb.processUserMarks and CUSTOM_INJECTION_MARK_CHAR in conf.data):
                    conf.data = getattr(conf.data, UNENCODED_ORIGINAL_VALUE, conf.data)
                    conf.data = conf.data.replace(CUSTOM_INJECTION_MARK_CHAR, ASTERISK_MARKER)
                    conf.data = re.sub(r'("(?P<name>[^"]+)"\s*:\s*"[^"]+)"', functools.partial(process, repl=r'\g<1>%s"' % CUSTOM_INJECTION_MARK_CHAR), conf.data)
                    conf.data = re.sub(r'("(?P<name>[^"]+)"\s*:\s*)(-?\d[\d\.]*\b)', functools.partial(process, repl=r'\g<0>%s' % CUSTOM_INJECTION_MARK_CHAR), conf.data)
                    match = re.search(r'(?P<name>[^"]+)"\s*:\s*\[([^\]]+)\]', conf.data)
                    if match and not (conf.testParameter and match.group("name") not in conf.testParameter):
                        _ = match.group(2)
                        _ = re.sub(r'("[^"]+)"', '\g<1>%s"' % CUSTOM_INJECTION_MARK_CHAR, _)
                        _ = re.sub(r'(\A|,|\s+)(-?\d[\d\.]*\b)', '\g<0>%s' % CUSTOM_INJECTION_MARK_CHAR, _)
                        conf.data = conf.data.replace(match.group(0), match.group(0).replace(match.group(2), _))

                kb.postHint = POST_HINT.JSON

        elif re.search(JSON_LIKE_RECOGNITION_REGEX, conf.data):
            message = "JSON-like data found in %s data. " % conf.method
            message += "Do you want to process it? [Y/n/q] "
            choice = readInput(message, default='Y').upper()

            if choice == 'Q':
                raise SqlmapUserQuitException
            elif choice == 'Y':
                if not (kb.processUserMarks and CUSTOM_INJECTION_MARK_CHAR in conf.data):
                    conf.data = getattr(conf.data, UNENCODED_ORIGINAL_VALUE, conf.data)
                    conf.data = conf.data.replace(CUSTOM_INJECTION_MARK_CHAR, ASTERISK_MARKER)
                    conf.data = re.sub(r"('(?P<name>[^']+)'\s*:\s*'[^']+)'", functools.partial(process, repl=r"\g<1>%s'" % CUSTOM_INJECTION_MARK_CHAR), conf.data)
                    conf.data = re.sub(r"('(?P<name>[^']+)'\s*:\s*)(-?\d[\d\.]*\b)", functools.partial(process, repl=r"\g<0>%s" % CUSTOM_INJECTION_MARK_CHAR), conf.data)

                kb.postHint = POST_HINT.JSON_LIKE

        elif re.search(ARRAY_LIKE_RECOGNITION_REGEX, conf.data):
            message = "Array-like data found in %s data. " % conf.method
            message += "Do you want to process it? [Y/n/q] "
            choice = readInput(message, default='Y').upper()

            if choice == 'Q':
                raise SqlmapUserQuitException
            elif choice == 'Y':
                if not (kb.processUserMarks and CUSTOM_INJECTION_MARK_CHAR in conf.data):
                    conf.data = conf.data.replace(CUSTOM_INJECTION_MARK_CHAR, ASTERISK_MARKER)
                    conf.data = re.sub(r"(=[^%s]+)" % DEFAULT_GET_POST_DELIMITER, r"\g<1>%s" % CUSTOM_INJECTION_MARK_CHAR, conf.data)

                kb.postHint = POST_HINT.ARRAY_LIKE

        elif re.search(XML_RECOGNITION_REGEX, conf.data):
            message = "SOAP/XML data found in %s data. " % conf.method
            message += "Do you want to process it? [Y/n/q] "
            choice = readInput(message, default='Y').upper()

            if choice == 'Q':
                raise SqlmapUserQuitException
            elif choice == 'Y':
                if not (kb.processUserMarks and CUSTOM_INJECTION_MARK_CHAR in conf.data):
                    conf.data = getattr(conf.data, UNENCODED_ORIGINAL_VALUE, conf.data)
                    conf.data = conf.data.replace(CUSTOM_INJECTION_MARK_CHAR, ASTERISK_MARKER)
                    conf.data = re.sub(r"(<(?P<name>[^>]+)( [^<]*)?>)([^<]+)(</\2)", functools.partial(process, repl=r"\g<1>\g<4>%s\g<5>" % CUSTOM_INJECTION_MARK_CHAR), conf.data)

                kb.postHint = POST_HINT.SOAP if "soap" in conf.data.lower() else POST_HINT.XML

        elif re.search(MULTIPART_RECOGNITION_REGEX, conf.data):
            message = "Multipart-like data found in %s data. " % conf.method
            message += "Do you want to process it? [Y/n/q] "
            choice = readInput(message, default='Y').upper()

            if choice == 'Q':
                raise SqlmapUserQuitException
            elif choice == 'Y':
                if not (kb.processUserMarks and CUSTOM_INJECTION_MARK_CHAR in conf.data):
                    conf.data = getattr(conf.data, UNENCODED_ORIGINAL_VALUE, conf.data)
                    conf.data = conf.data.replace(CUSTOM_INJECTION_MARK_CHAR, ASTERISK_MARKER)
                    conf.data = re.sub(r"(?si)((Content-Disposition[^\n]+?name\s*=\s*[\"'](?P<name>[^\n]+?)[\"']).+?)(((\r)?\n)+--)", functools.partial(process, repl=r"\g<1>%s\g<4>" % CUSTOM_INJECTION_MARK_CHAR), conf.data)

                kb.postHint = POST_HINT.MULTIPART

        if not kb.postHint:
            if CUSTOM_INJECTION_MARK_CHAR in conf.data:  # later processed
                pass
            else:
                place = PLACE.POST

                conf.parameters[place] = conf.data
                paramDict = paramToDict(place, conf.data)

                if paramDict:
                    conf.paramDict[place] = paramDict
                    testableParameters = True
        else:
            if CUSTOM_INJECTION_MARK_CHAR not in conf.data:  # in case that no usable parameter values has been found
                conf.parameters[PLACE.POST] = conf.data

    kb.processUserMarks = True if (kb.postHint and CUSTOM_INJECTION_MARK_CHAR in conf.data) else kb.processUserMarks

    if re.search(URI_INJECTABLE_REGEX, conf.url, re.I) and not any(place in conf.parameters for place in (PLACE.GET, PLACE.POST)) and not kb.postHint and not CUSTOM_INJECTION_MARK_CHAR in (conf.data or "") and conf.url.startswith("http"):
        warnMsg = "you've provided target URL without any GET "
        warnMsg += "parameters (e.g. 'http://www.site.com/article.php?id=1') "
        warnMsg += "and without providing any POST parameters "
        warnMsg += "through option '--data'"
        logger.warn(warnMsg)

        message = "do you want to try URI injections "
        message += "in the target URL itself? [Y/n/q] "
        choice = readInput(message, default='Y').upper()

        if choice == 'Q':
            raise SqlmapUserQuitException
        elif choice == 'Y':
            conf.url = "%s%s" % (conf.url, CUSTOM_INJECTION_MARK_CHAR)
            kb.processUserMarks = True

    for place, value in ((PLACE.URI, conf.url), (PLACE.CUSTOM_POST, conf.data), (PLACE.CUSTOM_HEADER, str(conf.httpHeaders))):
        _ = re.sub(PROBLEMATIC_CUSTOM_INJECTION_PATTERNS, "", value or "") if place == PLACE.CUSTOM_HEADER else value or ""
        if CUSTOM_INJECTION_MARK_CHAR in _:
            if kb.processUserMarks is None:
                lut = {PLACE.URI: '-u', PLACE.CUSTOM_POST: '--data', PLACE.CUSTOM_HEADER: '--headers/--user-agent/--referer/--cookie'}
                message = "custom injection marking character ('%s') found in option " % CUSTOM_INJECTION_MARK_CHAR
                message += "'%s'. Do you want to process it? [Y/n/q] " % lut[place]
                choice = readInput(message, default='Y').upper()

                if choice == 'Q':
                    raise SqlmapUserQuitException
                else:
                    kb.processUserMarks = choice == 'Y'

                    if kb.processUserMarks:
                        kb.testOnlyCustom = True

                        if "=%s" % CUSTOM_INJECTION_MARK_CHAR in _:
                            warnMsg = "it seems that you've provided empty parameter value(s) "
                            warnMsg += "for testing. Please, always use only valid parameter values "
                            warnMsg += "so sqlmap could be able to run properly"
                            logger.warn(warnMsg)

            if not kb.processUserMarks:
                if place == PLACE.URI:
                    query = urlparse.urlsplit(value).query
                    if query:
                        parameters = conf.parameters[PLACE.GET] = query
                        paramDict = paramToDict(PLACE.GET, parameters)

                        if paramDict:
                            conf.url = conf.url.split('?')[0]
                            conf.paramDict[PLACE.GET] = paramDict
                            testableParameters = True
                elif place == PLACE.CUSTOM_POST:
                    conf.parameters[PLACE.POST] = conf.data
                    paramDict = paramToDict(PLACE.POST, conf.data)

                    if paramDict:
                        conf.paramDict[PLACE.POST] = paramDict
                        testableParameters = True

            else:
                conf.parameters[place] = value
                conf.paramDict[place] = OrderedDict()

                if place == PLACE.CUSTOM_HEADER:
                    for index in xrange(len(conf.httpHeaders)):
                        header, value = conf.httpHeaders[index]
                        if CUSTOM_INJECTION_MARK_CHAR in re.sub(PROBLEMATIC_CUSTOM_INJECTION_PATTERNS, "", value):
                            parts = value.split(CUSTOM_INJECTION_MARK_CHAR)
                            for i in xrange(len(parts) - 1):
                                conf.paramDict[place]["%s #%d%s" % (header, i + 1, CUSTOM_INJECTION_MARK_CHAR)] = "%s,%s" % (header, "".join("%s%s" % (parts[j], CUSTOM_INJECTION_MARK_CHAR if i == j else "") for j in xrange(len(parts))))
                            conf.httpHeaders[index] = (header, value.replace(CUSTOM_INJECTION_MARK_CHAR, ""))
                else:
                    parts = value.split(CUSTOM_INJECTION_MARK_CHAR)

                    for i in xrange(len(parts) - 1):
                        name = None
                        if kb.postHint:
                            for ending, _ in hintNames:
                                if parts[i].endswith(ending):
                                    name = "%s %s" % (kb.postHint, _)
                                    break
                        if name is None:
                            name = "%s#%s%s" % (("%s " % kb.postHint) if kb.postHint else "", i + 1, CUSTOM_INJECTION_MARK_CHAR)
                        conf.paramDict[place][name] = "".join("%s%s" % (parts[j], CUSTOM_INJECTION_MARK_CHAR if i == j else "") for j in xrange(len(parts)))

                    if place == PLACE.URI and PLACE.GET in conf.paramDict:
                        del conf.paramDict[PLACE.GET]
                    elif place == PLACE.CUSTOM_POST and PLACE.POST in conf.paramDict:
                        del conf.paramDict[PLACE.POST]

                testableParameters = True

    if kb.processUserMarks:
        for item in ("url", "data", "agent", "referer", "cookie"):
            if conf.get(item):
                conf[item] = conf[item].replace(CUSTOM_INJECTION_MARK_CHAR, "")

    # Perform checks on Cookie parameters
    if conf.cookie:
        conf.parameters[PLACE.COOKIE] = conf.cookie
        paramDict = paramToDict(PLACE.COOKIE, conf.cookie)

        if paramDict:
            conf.paramDict[PLACE.COOKIE] = paramDict
            testableParameters = True

    # Perform checks on header values
    if conf.httpHeaders:
        for httpHeader, headerValue in list(conf.httpHeaders):
            # Url encoding of the header values should be avoided
            # Reference: http://stackoverflow.com/questions/5085904/is-ok-to-urlencode-the-value-in-headerlocation-value

            if httpHeader.title() == HTTP_HEADER.USER_AGENT:
                conf.parameters[PLACE.USER_AGENT] = urldecode(headerValue)

                condition = any((not conf.testParameter, intersect(conf.testParameter, USER_AGENT_ALIASES, True)))

                if condition:
                    conf.paramDict[PLACE.USER_AGENT] = {PLACE.USER_AGENT: headerValue}
                    testableParameters = True

            elif httpHeader.title() == HTTP_HEADER.REFERER:
                conf.parameters[PLACE.REFERER] = urldecode(headerValue)

                condition = any((not conf.testParameter, intersect(conf.testParameter, REFERER_ALIASES, True)))

                if condition:
                    conf.paramDict[PLACE.REFERER] = {PLACE.REFERER: headerValue}
                    testableParameters = True

            elif httpHeader.title() == HTTP_HEADER.HOST:
                conf.parameters[PLACE.HOST] = urldecode(headerValue)

                condition = any((not conf.testParameter, intersect(conf.testParameter, HOST_ALIASES, True)))

                if condition:
                    conf.paramDict[PLACE.HOST] = {PLACE.HOST: headerValue}
                    testableParameters = True

            else:
                condition = intersect(conf.testParameter, [httpHeader], True)

                if condition:
                    conf.parameters[PLACE.CUSTOM_HEADER] = str(conf.httpHeaders)
                    conf.paramDict[PLACE.CUSTOM_HEADER] = {httpHeader: "%s,%s%s" % (httpHeader, headerValue, CUSTOM_INJECTION_MARK_CHAR)}
                    conf.httpHeaders = [(header, value.replace(CUSTOM_INJECTION_MARK_CHAR, "")) for header, value in conf.httpHeaders]
                    testableParameters = True

    if not conf.parameters:
        errMsg = "you did not provide any GET, POST and Cookie "
        errMsg += "parameter, neither an User-Agent, Referer or Host header value"
        raise SqlmapGenericException(errMsg)

    elif not testableParameters:
        errMsg = "all testable parameters you provided are not present "
        errMsg += "within the given request data"
        raise SqlmapGenericException(errMsg)

    if conf.csrfToken:
        if not any(conf.csrfToken in _ for _ in (conf.paramDict.get(PLACE.GET, {}), conf.paramDict.get(PLACE.POST, {}))) and not re.search(r"\b%s\b" % re.escape(conf.csrfToken), conf.data or "") and not conf.csrfToken in set(_[0].lower() for _ in conf.httpHeaders) and not conf.csrfToken in conf.paramDict.get(PLACE.COOKIE, {}):
            errMsg = "anti-CSRF token parameter '%s' not " % conf.csrfToken
            errMsg += "found in provided GET, POST, Cookie or header values"
            raise SqlmapGenericException(errMsg)
    else:
        for place in (PLACE.GET, PLACE.POST, PLACE.COOKIE):
            for parameter in conf.paramDict.get(place, {}):
                if any(parameter.lower().count(_) for _ in CSRF_TOKEN_PARAMETER_INFIXES):
                    message = "%s parameter '%s' appears to hold anti-CSRF token. " % (place, parameter)
                    message += "Do you want sqlmap to automatically update it in further requests? [y/N] "

                    if readInput(message, default='N', boolean=True):
                        conf.csrfToken = parameter
                    break

def _setHashDB():
    """
    Check and set the HashDB SQLite file for query resume functionality.
    """

    if not conf.hashDBFile:
        conf.hashDBFile = conf.sessionFile or os.path.join(conf.outputPath, "session.sqlite")

    if os.path.exists(conf.hashDBFile):
        if conf.flushSession:
            try:
                os.remove(conf.hashDBFile)
                logger.info("flushing session file")
            except OSError, msg:
                errMsg = "unable to flush the session file (%s)" % msg
                raise SqlmapFilePathException(errMsg)

    conf.hashDB = HashDB(conf.hashDBFile)

def _resumeHashDBValues():
    """
    Resume stored data values from HashDB
    """

    kb.absFilePaths = hashDBRetrieve(HASHDB_KEYS.KB_ABS_FILE_PATHS, True) or kb.absFilePaths
    kb.brute.tables = hashDBRetrieve(HASHDB_KEYS.KB_BRUTE_TABLES, True) or kb.brute.tables
    kb.brute.columns = hashDBRetrieve(HASHDB_KEYS.KB_BRUTE_COLUMNS, True) or kb.brute.columns
    kb.chars = hashDBRetrieve(HASHDB_KEYS.KB_CHARS, True) or kb.chars
    kb.dynamicMarkings = hashDBRetrieve(HASHDB_KEYS.KB_DYNAMIC_MARKINGS, True) or kb.dynamicMarkings
    kb.xpCmdshellAvailable = hashDBRetrieve(HASHDB_KEYS.KB_XP_CMDSHELL_AVAILABLE) or kb.xpCmdshellAvailable

    kb.errorChunkLength = hashDBRetrieve(HASHDB_KEYS.KB_ERROR_CHUNK_LENGTH)
    if kb.errorChunkLength and kb.errorChunkLength.isdigit():
        kb.errorChunkLength = int(kb.errorChunkLength)
    else:
        kb.errorChunkLength = None

    conf.tmpPath = conf.tmpPath or hashDBRetrieve(HASHDB_KEYS.CONF_TMP_PATH)

    for injection in hashDBRetrieve(HASHDB_KEYS.KB_INJECTIONS, True) or []:
        if isinstance(injection, InjectionDict) and injection.place in conf.paramDict and \
            injection.parameter in conf.paramDict[injection.place]:

            if not conf.tech or intersect(conf.tech, injection.data.keys()):
                if intersect(conf.tech, injection.data.keys()):
                    injection.data = dict(_ for _ in injection.data.items() if _[0] in conf.tech)

                if injection not in kb.injections:
                    kb.injections.append(injection)

    _resumeDBMS()
    _resumeOS()

def _resumeDBMS():
    """
    Resume stored DBMS information from HashDB
    """

    value = hashDBRetrieve(HASHDB_KEYS.DBMS)

    if not value:
        return

    dbms = value.lower()
    dbmsVersion = [UNKNOWN_DBMS_VERSION]
    _ = "(%s)" % ("|".join([alias for alias in SUPPORTED_DBMS]))
    _ = re.search(r"\A%s (.*)" % _, dbms, re.I)

    if _:
        dbms = _.group(1).lower()
        dbmsVersion = [_.group(2)]

    if conf.dbms:
        check = True
        for aliases, _, _, _ in DBMS_DICT.values():
            if conf.dbms.lower() in aliases and dbms not in aliases:
                check = False
                break

        if not check:
            message = "you provided '%s' as a back-end DBMS, " % conf.dbms
            message += "but from a past scan information on the target URL "
            message += "sqlmap assumes the back-end DBMS is '%s'. " % dbms
            message += "Do you really want to force the back-end "
            message += "DBMS value? [y/N] "

            if not readInput(message, default='N', boolean=True):
                conf.dbms = None
                Backend.setDbms(dbms)
                Backend.setVersionList(dbmsVersion)
    else:
        infoMsg = "resuming back-end DBMS '%s' " % dbms
        logger.info(infoMsg)

        Backend.setDbms(dbms)
        Backend.setVersionList(dbmsVersion)

def _resumeOS():
    """
    Resume stored OS information from HashDB
    """

    value = hashDBRetrieve(HASHDB_KEYS.OS)

    if not value:
        return

    os = value

    if os and os != 'None':
        infoMsg = "resuming back-end DBMS operating system '%s' " % os
        logger.info(infoMsg)

        if conf.os and conf.os.lower() != os.lower():
            message = "you provided '%s' as back-end DBMS operating " % conf.os
            message += "system, but from a past scan information on the "
            message += "target URL sqlmap assumes the back-end DBMS "
            message += "operating system is %s. " % os
            message += "Do you really want to force the back-end DBMS "
            message += "OS value? [y/N] "

            if not readInput(message, default='N', boolean=True):
                conf.os = os
        else:
            conf.os = os

        Backend.setOs(conf.os)

def _setResultsFile():
    """
    Create results file for storing results of running in a
    multiple target mode.
    """

    if not conf.multipleTargets:
        return

    if not conf.resultsFP:
        conf.resultsFilename = os.path.join(paths.SQLMAP_OUTPUT_PATH, time.strftime(RESULTS_FILE_FORMAT).lower())
        try:
            conf.resultsFP = openFile(conf.resultsFilename, "w+", UNICODE_ENCODING, buffering=0)
        except (OSError, IOError), ex:
            try:
                warnMsg = "unable to create results file '%s' ('%s'). " % (conf.resultsFilename, getUnicode(ex))
                handle, conf.resultsFilename = tempfile.mkstemp(prefix=MKSTEMP_PREFIX.RESULTS, suffix=".csv")
                os.close(handle)
                conf.resultsFP = openFile(conf.resultsFilename, "w+", UNICODE_ENCODING, buffering=0)
                warnMsg += "Using temporary file '%s' instead" % conf.resultsFilename
                logger.warn(warnMsg)
            except IOError, _:
                errMsg = "unable to write to the temporary directory ('%s'). " % _
                errMsg += "Please make sure that your disk is not full and "
                errMsg += "that you have sufficient write permissions to "
                errMsg += "create temporary files and/or directories"
                raise SqlmapSystemException(errMsg)

        conf.resultsFP.writelines("Target URL,Place,Parameter,Technique(s),Note(s)%s" % os.linesep)

        logger.info("using '%s' as the CSV results file in multiple targets mode" % conf.resultsFilename)

def _createFilesDir():
    """
    Create the file directory.
    """

    if not conf.rFile:
        return

    conf.filePath = paths.SQLMAP_FILES_PATH % conf.hostname

    if not os.path.isdir(conf.filePath):
        try:
            os.makedirs(conf.filePath, 0755)
        except OSError, ex:
            tempDir = tempfile.mkdtemp(prefix="sqlmapfiles")
            warnMsg = "unable to create files directory "
            warnMsg += "'%s' (%s). " % (conf.filePath, getUnicode(ex))
            warnMsg += "Using temporary directory '%s' instead" % tempDir
            logger.warn(warnMsg)

            conf.filePath = tempDir

def _createDumpDir():
    """
    Create the dump directory.
    """

    if not conf.dumpTable and not conf.dumpAll and not conf.search:
        return

    conf.dumpPath = paths.SQLMAP_DUMP_PATH % conf.hostname

    if not os.path.isdir(conf.dumpPath):
        try:
            os.makedirs(conf.dumpPath, 0755)
        except OSError, ex:
            tempDir = tempfile.mkdtemp(prefix="sqlmapdump")
            warnMsg = "unable to create dump directory "
            warnMsg += "'%s' (%s). " % (conf.dumpPath, getUnicode(ex))
            warnMsg += "Using temporary directory '%s' instead" % tempDir
            logger.warn(warnMsg)

            conf.dumpPath = tempDir

def _configureDumper():
    conf.dumper = dumper
    conf.dumper.setOutputFile()

def _createTargetDirs():
    """
    Create the output directory.
    """

    try:
        if not os.path.isdir(paths.SQLMAP_OUTPUT_PATH):
            os.makedirs(paths.SQLMAP_OUTPUT_PATH, 0755)

        _ = os.path.join(paths.SQLMAP_OUTPUT_PATH, randomStr())
        open(_, "w+b").close()
        os.remove(_)

        if conf.outputDir:
            warnMsg = "using '%s' as the output directory" % paths.SQLMAP_OUTPUT_PATH
            logger.warn(warnMsg)
    except (OSError, IOError), ex:
        try:
            tempDir = tempfile.mkdtemp(prefix="sqlmapoutput")
        except Exception, _:
            errMsg = "unable to write to the temporary directory ('%s'). " % _
            errMsg += "Please make sure that your disk is not full and "
            errMsg += "that you have sufficient write permissions to "
            errMsg += "create temporary files and/or directories"
            raise SqlmapSystemException(errMsg)

        warnMsg = "unable to %s output directory " % ("create" if not os.path.isdir(paths.SQLMAP_OUTPUT_PATH) else "write to the")
        warnMsg += "'%s' (%s). " % (paths.SQLMAP_OUTPUT_PATH, getUnicode(ex))
        warnMsg += "Using temporary directory '%s' instead" % getUnicode(tempDir)
        logger.warn(warnMsg)

        paths.SQLMAP_OUTPUT_PATH = tempDir

    conf.outputPath = os.path.join(getUnicode(paths.SQLMAP_OUTPUT_PATH), normalizeUnicode(getUnicode(conf.hostname)))

    if not os.path.isdir(conf.outputPath):
        try:
            os.makedirs(conf.outputPath, 0755)
        except (OSError, IOError), ex:
            try:
                tempDir = tempfile.mkdtemp(prefix="sqlmapoutput")
            except Exception, _:
                errMsg = "unable to write to the temporary directory ('%s'). " % _
                errMsg += "Please make sure that your disk is not full and "
                errMsg += "that you have sufficient write permissions to "
                errMsg += "create temporary files and/or directories"
                raise SqlmapSystemException(errMsg)

            warnMsg = "unable to create output directory "
            warnMsg += "'%s' (%s). " % (conf.outputPath, getUnicode(ex))
            warnMsg += "Using temporary directory '%s' instead" % getUnicode(tempDir)
            logger.warn(warnMsg)

            conf.outputPath = tempDir

    try:
        with codecs.open(os.path.join(conf.outputPath, "target.txt"), "w+", UNICODE_ENCODING) as f:
            f.write(kb.originalUrls.get(conf.url) or conf.url or conf.hostname)
            f.write(" (%s)" % (HTTPMETHOD.POST if conf.data else HTTPMETHOD.GET))
            f.write("  # %s" % getUnicode(subprocess.list2cmdline(sys.argv), encoding=sys.stdin.encoding))
            if conf.data:
                f.write("\n\n%s" % getUnicode(conf.data))
    except IOError, ex:
        if "denied" in getUnicode(ex):
            errMsg = "you don't have enough permissions "
        else:
            errMsg = "something went wrong while trying "
        errMsg += "to write to the output directory '%s' (%s)" % (paths.SQLMAP_OUTPUT_PATH, getSafeExString(ex))

        raise SqlmapMissingPrivileges(errMsg)

    _createDumpDir()
    _createFilesDir()
    _configureDumper()

def _restoreMergedOptions():
    """
    Restore merged options (command line, configuration file and default values)
    that could be possibly changed during the testing of previous target.
    """

    for option in RESTORE_MERGED_OPTIONS:
        conf[option] = mergedOptions[option]

def initTargetEnv():
    """
    Initialize target environment.
    """

    if conf.multipleTargets:
        if conf.hashDB:
            conf.hashDB.close()

        if conf.cj:
            resetCookieJar(conf.cj)

        conf.paramDict = {}
        conf.parameters = {}
        conf.hashDBFile = None

        _setKnowledgeBaseAttributes(False)
        _restoreMergedOptions()
        _setDBMS()

    if conf.data:
        class _(unicode):
            pass

        kb.postUrlEncode = True

        for key, value in conf.httpHeaders:
            if key.upper() == HTTP_HEADER.CONTENT_TYPE.upper():
                kb.postUrlEncode = "urlencoded" in value
                break

        if kb.postUrlEncode:
            original = conf.data
            conf.data = _(urldecode(conf.data))
            setattr(conf.data, UNENCODED_ORIGINAL_VALUE, original)
            kb.postSpaceToPlus = '+' in original

def setupTargetEnv():
    _createTargetDirs()
    _setRequestParams()
    _setHashDB()
    _resumeHashDBValues()
    _setResultsFile()
    _setAuthCred()