#!/usr/bin/env python

"""
$Id$

This file is part of the sqlmap project, http://sqlmap.sourceforge.net.

Copyright (c) 2006-2008 Bernardo Damele A. G. <bernardo.damele@gmail.com>
                        and Daniele Bellucci <daniele.bellucci@gmail.com>

sqlmap is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation version 2 of the License.

sqlmap is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
details.

You should have received a copy of the GNU General Public License along
with sqlmap; if not, write to the Free Software Foundation, Inc., 51
Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
"""



import re

from lib.core.common import formatFingerprint
from lib.core.common import getHtmlErrorFp
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.exception import sqlmapSyntaxException
from lib.core.session import setDbms
from lib.core.settings import PGSQL_ALIASES
from lib.core.unescaper import unescaper
from lib.request import inject
#from lib.utils.fuzzer import passiveFuzzing

from plugins.generic.enumeration import Enumeration
from plugins.generic.filesystem import Filesystem
from plugins.generic.fingerprint import Fingerprint
from plugins.generic.takeover import Takeover


class PostgreSQLMap(Fingerprint, Enumeration, Filesystem, Takeover):
    """
    This class defines PostgreSQL methods
    """

    def __init__(self):
        Enumeration.__init__(self, "PostgreSQL")

        unescaper.setUnescape(PostgreSQLMap.unescape)


    @staticmethod
    def unescape(expression):
        while True:
            index = expression.find("'")
            if index == -1:
                break

            firstIndex = index + 1
            index = expression[firstIndex:].find("'")

            if index == -1:
                raise sqlmapSyntaxException, "Unenclosed ' in '%s'" % expression

            lastIndex = firstIndex + index
            old = "'%s'" % expression[firstIndex:lastIndex]
            unescaped = "("

            for i in range(firstIndex, lastIndex):
                unescaped += "CHR(%d)" % (ord(expression[i]))
                if i < lastIndex - 1:
                    unescaped += "||"

            unescaped += ")"
            expression = expression.replace(old, unescaped)

        return expression


    @staticmethod
    def escape(expression):
        while True:
            index = expression.find("CHR(")
            if index == -1:
                break

            firstIndex = index
            index = expression[firstIndex:].find("))")

            if index == -1:
                raise sqlmapSyntaxException, "Unenclosed ) in '%s'" % expression

            lastIndex = firstIndex + index + 1
            old = expression[firstIndex:lastIndex]
            oldUpper = old.upper()
            oldUpper = oldUpper.replace("CHR(", "").replace(")", "")
            oldUpper = oldUpper.split("||")

            escaped = "'%s'" % "".join([chr(int(char)) for char in oldUpper])
            expression = expression.replace(old, escaped)

        return expression


    def getFingerprint(self):
        if not conf.extensiveFp:
            return "PostgreSQL"

        actVer = formatFingerprint()

        blank = " " * 16
        value = "active fingerprint: %s" % actVer

        if self.banner:
            banVer = re.search("^PostgreSQL ([\d\.]+)", self.banner)
            banVer = banVer.groups()[0]
            banVer = formatFingerprint([banVer])

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

        #passiveFuzzing()
        htmlParsed = getHtmlErrorFp()

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

        return value


    def checkDbms(self):
        if conf.dbms in PGSQL_ALIASES:
            setDbms("PostgreSQL")

            if not conf.extensiveFp:
                return True

        logMsg = "testing PostgreSQL"
        logger.info(logMsg)

        randInt = str(randomInt(1))
        query = "COALESCE(%s, NULL)" % randInt

        if inject.getValue(query) == randInt:
            logMsg = "confirming PostgreSQL"
            logger.info(logMsg)

            query = "LENGTH('%s')" % randInt

            if not inject.getValue(query) == "1":
                warnMsg = "the back-end DMBS is not PostgreSQL"
                logger.warn(warnMsg)

                return False

            setDbms("PostgreSQL")

            if not conf.extensiveFp:
                return True

            if inject.getValue("SUBSTR(TRANSACTION_TIMESTAMP(), 1, 1)") == "2":
                kb.dbmsVersion = [">= 8.2.0"]
            elif inject.getValue("GREATEST(5, 9, 1)") == "9":
                kb.dbmsVersion = [">= 8.1.0", "< 8.2.0"]
            elif inject.getValue("WIDTH_BUCKET(5.35, 0.024, 10.06, 5)") == "3":
                kb.dbmsVersion = [">= 8.0.0", "< 8.1.0"]
            elif inject.getValue("SUBSTR(MD5('sqlmap'), 1, 1)"):
                kb.dbmsVersion = [">= 7.4.0", "< 8.0.0"]
            elif inject.getValue("SUBSTR(CURRENT_SCHEMA(), 1, 1)") == "p":
                kb.dbmsVersion = [">= 7.3.0", "< 7.4.0"]
            elif inject.getValue("BIT_LENGTH(1)") == "8":
                kb.dbmsVersion = [">= 7.2.0", "< 7.3.0"]
            elif inject.getValue("SUBSTR(QUOTE_LITERAL('a'), 2, 1)") == "a":
                kb.dbmsVersion = [">= 7.1.0", "< 7.2.0"]
            elif inject.getValue("POW(2, 3)") == "8":
                kb.dbmsVersion = [">= 7.0.0", "< 7.1.0"]
            elif inject.getValue("MAX('a')") == "a":
                kb.dbmsVersion = [">= 6.5.0", "< 6.5.3"]
            elif re.search("([\d\.]+)", inject.getValue("SUBSTR(VERSION(), 12, 5)")):
                kb.dbmsVersion = [">= 6.4.0", "< 6.5.0"]
            elif inject.getValue("SUBSTR(CURRENT_DATE, 1, 1)") == "2":
                kb.dbmsVersion = [">= 6.3.0", "< 6.4.0"]
            elif inject.getValue("SUBSTRING('sqlmap', 1, 1)") == "s":
                kb.dbmsVersion = [">= 6.2.0", "< 6.3.0"]
            else:
                kb.dbmsVersion = ["< 6.2.0"]

            if conf.getBanner:
                self.banner = inject.getValue("VERSION()")

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

            return False