'''

Created on Nov 19, 2013

@author: BarthaM

'''

import os

import os.path

from subprocess import Popen, PIPE, call

import subprocess

import sys

import re

import _winreg

from cygwin import Cygwin

from environment import Environment

import threading

import time

import string

import shutil

import stat

import tempfile

DEBUG = True

class VMManagerException(Exception):

    def __init__(self, value):

        self.value = value

    def __str__(self):

        return repr(self.value)

class USBFilter:

    vendorid = ""

    productid = ""

    revision = ""

    def __init__(self, vendorid, productid, revision):

        self.vendorid = vendorid.lower()

        self.productid = productid.lower()

        self.revision = revision.lower()

        return

    def __eq__(self, other):

        return self.vendorid == other.vendorid and self.productid == other.productid and self.revision == other.revision

    def __hash__(self):

        return hash(self.vendorid) ^ hash(self.productid) ^ hash(self.revision)

    def __repr__(self):

        return "VendorId = \'" + str(self.vendorid) + "\' ProductId = \'" + str(self.productid) + "\' Revision = \'" + str(self.revision) + "\'"

class VMManager(object):

    vmRootName = "SecurityDVM"

    systemProperties = None

    cygwin_path = 'c:\\cygwin64\\bin\\'

    vboxManage = 'VBoxManage'

    startNotifications = list()

    _instance = None

    #def __new__(cls, *args, **kwargs):

    #    if not cls._instance:

    #        cls._instance = super(VMManager, cls).__new__(cls, *args, **kwargs)

    #    return cls._instance

    _instance = None

    #def __new__(cls, *args, **kwargs):

    #    if not cls._instance:

    #        cls._instance = super(VMManager, cls).__new__(cls, *args, **kwargs)

    #    return cls._instance

    def __init__(self):

        self.cygwin_path = os.path.join(Cygwin.root(), 'bin') + os.path.sep

        self.vboxManage = os.path.join(self.getVBoxManagePath(), 'VBoxManage')

        self.systemProperties = self.getSystemProperties()

        return

    @staticmethod

    def getInstance():

        if VMManager._instance == None:

            VMManager._instance = VMManager()

        return VMManager._instance

    def putStartNotification(self, ip):

        self.startNotifications.append(ip)

    def isSDVMStarted(self, ip):

        return self.startNotifications.contains(ip)

    def execute(self, cmd, wait_return=True ):

        if DEBUG:

            print('trying to launch: ' + cmd)

        process = Popen(cmd, stdout=PIPE, stderr=PIPE) #shell = True

        if DEBUG:

            print('launched: ' + cmd)

        if not wait_return:

            return [0, 'working in background', '']

        result = process.wait()

        res_stdout = process.stdout.read();

        res_stderr = process.stderr.read();

        if DEBUG:

            if res_stdout != "":

                print res_stdout

            if res_stderr != "":

                print res_stderr

        if result !=0:

            raise VMManagerException(res_stderr)

        return result, res_stdout, res_stderr

    def getVBoxManagePath(self):

        """get the path to the VirtualBox installation on this system"""

        p = None

        try:

            k = _winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE, 'SOFTWARE\Oracle\VirtualBox')

            p = _winreg.QueryValueEx(k, 'InstallDir')[0]

            _winreg.CloseKey(k)

        except:

            pass

        return p

    # return hosty system properties

    def getSystemProperties(self):

        cmd = self.vboxManage + ' list systemproperties'

        result = self.execute(cmd)

        if result[1]=='':

            return None

        props = dict((k.strip(),v.strip().strip('"')) for k,v in (line.split(':', 1) for line in result[1].strip().splitlines()))

        return props

    # return the folder containing the guest VMs     

    def getDefaultMachineFolder(self):

        return self.systemProperties["Default machine folder"]

    #list the hostonly IFs exposed by the VBox host

    def getHostOnlyIFs(self):

        cmd = 'VBoxManage list hostonlyifs'

        result = self.execute(cmd)[1]

        if result=='':

            return None

        props = dict((k.strip(),v.strip().strip('"')) for k,v in (line.split(':', 1) for line in result.strip().splitlines()))

        return props

    def listRSDS(self):

        cmd = 'VBoxManage list usbhost'

        results = self.execute(cmd)[1]

        results = results.split('Host USB Devices:')[1].strip()

        items = list( "UUID:"+result for result in results.split('UUID:') if result != '')

        rsds = dict()   

        for item in items:

            props = dict()

            for line in item.splitlines():

                if line != "":         

                    k,v = line[:line.index(':')].strip(), line[line.index(':')+1:].strip()

                    props[k] = v;

            if 'Product' in props.keys() and props['Product'] == 'Mass Storage':

                usb_filter = USBFilter( re.search(r"\((?P<vid>[0-9A-Fa-f]+)\)", props['VendorId']).groupdict()['vid'], 

                                        re.search(r"\((?P<pid>[0-9A-Fa-f]+)\)", props['ProductId']).groupdict()['pid'],

                                        re.search(r"\((?P<rev>[0-9A-Fa-f]+)\)", props['Revision']).groupdict()['rev'] )

                rsds[props['UUID']] = usb_filter;

                if DEBUG:

                    print usb_filter

        return rsds

    # list all existing VMs registered with VBox

    def listVM(self):

        cmd = 'VBoxManage list vms'

        result = self.execute(cmd)[1]

        vms = list(k.strip().strip('"') for k,_ in (line.split(' ') for line in result.splitlines()))

        return vms

    # list existing SDVMs

    def listSDVM(self):

        vms = self.listVM()

        svdms = []

        for vm in vms:

            if vm.startswith(self.vmRootName) and vm != self.vmRootName:

                svdms.append(vm)

        return svdms

    # generate valid (not already existing SDVM name). necessary for creating a new VM

    def generateSDVMName(self):

        vms = self.listVM()

        for i in range(0,999):

            if(not self.vmRootName+str(i) in vms):

                return self.vmRootName+str(i)

        return ''

    # return the RSDs attached to all existing SDVMs

    def getAttachedRSDs(self):

        vms = self.listSDVM()

        attached_devices = dict()

        for vm in vms:

            rsd_filter = self.getUSBFilter(vm)

            if rsd_filter != None:

                attached_devices[vm] = rsd_filter

        return attached_devices

    # configures hostonly networking and DHCP server. requires admin rights

    def configureHostNetworking(self):

        #cmd = 'vboxmanage list hostonlyifs'

        #self.execute(cmd)

        #cmd = 'vboxmanage hostonlyif remove \"VirtualBox Host-Only Ethernet Adapter\"'

        #self.execute(cmd)

        #cmd = 'vboxmanage hostonlyif create'

        #self.execute(cmd)

        cmd = 'VBoxManage hostonlyif ipconfig \"VirtualBox Host-Only Ethernet Adapter\" --ip 192.168.56.1 --netmask 255.255.255.0'

        self.execute(cmd)

        #cmd = 'vboxmanage dhcpserver add'

        #self.execute(cmd)

        cmd = 'VBoxManage dhcpserver modify --ifname \"VirtualBox Host-Only Ethernet Adapter\" --ip 192.168.56.100 --netmask 255.255.255.0 --lowerip 192.168.56.101 --upperip 192.168.56.200'

        self.execute(cmd)

    #create new virtual machine instance based on template vm named SecurityDVM (\SecurityDVM\SecurityDVM.vmdk)

    def createVM(self, vm_name):

        hostonly_if = self.getHostOnlyIFs()

        machineFolder = self.getDefaultMachineFolder()

        cmd = 'VBoxManage createvm --name ' + vm_name + ' --ostype Debian --register'

        self.execute(cmd)

        cmd = 'VBoxManage modifyvm ' + vm_name + ' --memory 512 --vram 10 --cpus 1 --usb on --usbehci on --nic1 hostonly --hostonlyadapter1 \"' + hostonly_if['Name'] + '\" --nic2 nat' 

        self.execute(cmd)

        cmd = 'VBoxManage storagectl ' + vm_name + ' --name contr1 --add sata --portcount 2'

        self.execute(cmd)

        cmd = 'VBoxManage storageattach ' + vm_name + ' --storagectl contr1 --port 0 --device 0 --type hdd --medium \"'+ machineFolder + '\SecurityDVM\SecurityDVM.vmdk\"' #--mtype immutable

        self.execute(cmd)

        return

    #remove VM from the system. should be used on VMs returned by listSDVMs    

    def removeVM(self, vm_name):

        print('removing ' + vm_name)

        cmd = 'VBoxManage unregistervm ' + vm_name + ' --delete'

        print self.execute(cmd)

        machineFolder = self.getDefaultMachineFolder()

        cmd = self.cygwin_path + 'bash.exe --login -c \"rm -rf ' + machineFolder + '\\' + vm_name + '*\"'

        print self.execute(cmd)

    # start VM

    def startVM(self, vm_name):

        print('starting ' +  vm_name)

        cmd = 'VBoxManage startvm ' + vm_name + ' --type headless' 

        result = self.execute(cmd)

        while not string.find(str(result), 'successfully started',):

            print "Failed to start SDVM: ", vm_name, " retrying"

            time.sleep(1)

            result = self.execute(cmd)

        return result[0]

    # stop VM    

    def stopVM(self, vm_name):

        print('stopping ' + vm_name)

        cmd = 'VBoxManage controlvm ' + vm_name + ' poweroff'

        self.execute(cmd)

    # return the hostOnly IP for a running guest    

    def getHostOnlyIP(self, vm_name):

        print('gettting hostOnly IP address ' + vm_name)

        cmd = 'VBoxManage guestproperty get ' + vm_name + ' /VirtualBox/GuestInfo/Net/0/V4/IP'

        result = self.execute(cmd)

        if result=='':

            return None

        result = result[1]

        if result.startswith('No value set!'):

            return None

        return result[result.index(':')+1:].strip()

    # attach removable storage device to VM by provision of filter

    def attachRSD(self, vm_name, rsd_filter):

        cmd = 'VBoxManage usbfilter add 0 --target ' + vm_name + ' --name OpenSecurityRSD --vendorid ' + rsd_filter.vendorid + ' --productid ' + rsd_filter.productid + ' --revision ' + rsd_filter.revision

        print self.execute(cmd)

    # return the description set for an existing VM

    def getVMInfo(self, vm_name):

        cmd = 'VBoxManage showvminfo ' + vm_name + ' --machinereadable'

        results = self.execute(cmd)[1]

        props = dict((k.strip(),v.strip().strip('"')) for k,v in (line.split('=', 1) for line in results.splitlines()))

        return props

    # return the configured USB filter for an existing VM 

    def getUSBFilter(self, vm_name):

        props = self.getVMInfo(vm_name)

        keys = set(['USBFilterVendorId1', 'USBFilterProductId1', 'USBFilterRevision1'])

        keyset = set(props.keys())

        usb_filter = None

        if keyset.issuperset(keys):

            usb_filter = USBFilter(props['USBFilterVendorId1'], props['USBFilterProductId1'], props['USBFilterRevision1'])

        return usb_filter

    #generates ISO containing authorized_keys for use with guest VM

    def genCertificateISO(self, vm_name):

        # create a SSH key pair in a machine subfolder

        #

        # to avoid any DOS window popping up we use

        # the cygwin's class which relies on the

        # shadowrun.exe.

        #

        # shadowrun.exe is derived from a run.exe of

        # the cygwin utilities but with a fix to

        # avoid Console Windows to pop up.

        # 

        # However, run.exe suffers from bad

        # argument handling, when there are spaces

        # within and so does shadowrun.exe

        #

        # In order to avoid any complex mechanics

        # we start a bash script, which creates the

        # SSH certificate in the local folder.

        #

        # Even more: to get rid of any potential

        # space ' ' hazard in path names, we copy

        # the script to the creation side as well.

        #

        # ... and yes: shadowrun.exe terminates

        # with a ACCESS_VIOLATION and creates another

        # stack-trace-dump file in the folder.

        #

        # But so does the original cygwin's run.exe

        # too.

        #           -.-

        #

        # (On the good side: the access violation happens

        # *after* the wrapped process has been launched)

        #

        machineFolder = self.getDefaultMachineFolder()

        vm_folder = os.path.join(machineFolder, vm_name)

        old_dir = os.getcwd()

        os.chdir(vm_folder)

        print(os.path.join(sys.path[0], 'create-cert-and-iso.sh'))

        shutil.copy(os.path.join(sys.path[0], 'create-cert-and-iso.sh'), vm_folder)

        p = Cygwin()(['/bin/bash', '-c', './create-cert-and-iso.sh'])

        p.communicate()

        os.chdir(old_dir)

    # attaches generated ssh public cert to guest vm

    def attachCertificateISO(self, vm_name):

        machineFolder = self.getDefaultMachineFolder()

        cmd = 'vboxmanage storageattach ' + vm_name + ' --storagectl contr1 --port 1 --device 0 --type dvddrive --mtype readonly --medium \"' + machineFolder + '\\' + vm_name + '\\'+ vm_name + '.iso\"'

        result = self.execute(cmd)

        return result

    handleDeviceChangeLock = threading.Lock()

    # handles device change events

    def handleDeviceChange(self):

        if VMManager.handleDeviceChangeLock.acquire(True):

            #destroy unused vms

            new_ip = None

            attached_devices = self.getAttachedRSDs()

            connected_devices = self.listRSDS()

            for vm_name in attached_devices.keys():

                if attached_devices[vm_name] not in connected_devices.values():

                    self.unmapNetworkDrive('h:')

                    self.stopVM(vm_name)

                    self.removeVM(vm_name)

            #create new vm for attached device if any

            attached_devices = self.getAttachedRSDs()

            for connected_device in connected_devices.values():

                if (attached_devices and False) or (connected_device not in attached_devices.values()):

                    new_sdvm = self.generateSDVMName()

                    self.createVM(new_sdvm)

                    self.attachRSD(new_sdvm, connected_device)

                    self.startVM(new_sdvm)

                    # wait for machine to come up

                    while new_ip == None:

                        time.sleep(1)

                        new_ip = self.getHostOnlyIP(new_sdvm)

                    while new_ip not in self.startNotifications:

                        time.sleep(1)

                    if new_ip != None:

                        self.mapNetworkDrive('h:', '\\\\' + new_ip + '\\USB', None, None)

                    #TODO: cleanup notifications somwhere else (eg. machine shutdown)

                    self.startNotifications.remove(new_ip)

            VMManager.handleDeviceChangeLock.release()

            return new_ip

    def handleBrowsingRequest(self):

        if VMManager.handleDeviceChangeLock.acquire(True):

            new_ip = None

            new_sdvm = self.generateSDVMName()

            self.createVM(new_sdvm)

            self.genCertificateISO(new_sdvm)

            self.attachCertificateISO(new_sdvm)

            self.startVM(new_sdvm)

            # wait for machine to come up

            while new_ip == None:

                time.sleep(1)

                new_ip = self.getHostOnlyIP(new_sdvm)

            while new_ip not in self.startNotifications:

                time.sleep(1)

            if new_ip != None:

                self.mapNetworkDrive('g:', '\\\\' + new_ip + '\\Download', None, None)

            #TODO: cleanup notifications somwhere else (eg. machine shutdown)

            self.startNotifications.remove(new_ip)

            VMManager.handleDeviceChangeLock.release()

        return new_sdvm

    # executes command over ssh on guest vm

    def sshGuestExecute(self, vm_name, prog, user_name='osecuser'):

        # get vm ip

        address = self.getHostOnlyIP(vm_name)

        machineFolder = self.getDefaultMachineFolder()

        # run command

        cmd = self.cygwin_path+'bash.exe --login -c \"ssh -o StrictHostKeyChecking=no -i \\\"' + machineFolder + '\\' + vm_name + '\\dvm_key\\\"  ' + user_name + '@' + address + ' ' + prog + '\"'

        return self.execute(cmd)

    # executes command over ssh on guest vm with X forwarding

    def sshGuestX11Execute(self, vm_name, prog, user_name='osecuser'):

        #TODO: verify if X server is running on user account 

        #TODO: set DISPLAY accordingly

        address = self.getHostOnlyIP(vm_name)

        machineFolder = self.getDefaultMachineFolder()

        # run command

        #--login

        #cmd = self.cygwin_path+'bash.exe --login -c \"DISPLAY=:0 ssh -v -Y -i \\\"' + machineFolder + '\\' + vm_name + '\\dvm_key\\\"  '  + user_name + '@' + address + ' ' + prog + '\"'

        cmd = self.cygwin_path+'mintty.exe -e /bin/env DISPLAY=:0 /usr/bin/ssh -o StrictHostKeyChecking=no -v -Y -i \"' + machineFolder + '\\' + vm_name + '\\dvm_key\"  '  + user_name + '@' + address + ' ' + prog + ''

        #cmd = self.cygwin_path+'mintty.exe -e /bin/bash --login -c \"DISPLAY=:0 /usr/bin/ssh -v -Y -i \\\"' + machineFolder + '\\' + vm_name + '\\dvm_key\\\"  '  + user_name + '@' + address + ' ' + prog + '\"'

        if DEBUG:

            print('trying to launch: ' + cmd)

        process = Popen(cmd)

        if DEBUG:

            print('launched: ' + cmd)

        return     

    #Small function to check the availability of network resource.

    def isAvailable(self, path):

        cmd = 'IF EXIST ' + path + ' echo YES'

        result = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=True).communicate()

        return string.find(str(result), 'YES',)

    #Small function to check if the mention location is a directory

    def isDirectory(self, path):

        cmd = 'dir ' + path + ' | FIND ".."'

        result = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=True).communicate()

        return string.find(str(result), 'DIR',)

    def mapNetworkDrive(self, drive, networkPath, user, password):

        self.unmapNetworkDrive('h:')

        #Check for drive availability

        if self.isAvailable(drive) > -1:

            print "Drive letter is already in use: ", drive

            return -1

        #Check for network resource availability

        while self.isAvailable(networkPath) == -1:

            time.sleep(1)

            print "Path not accessible: ", networkPath, " retrying"

            #return -1

        #Prepare 'NET USE' commands

        cmd = 'NET USE ' + drive + ' ' + networkPath

        if user != None:

            cmd = cmd + ' ' + password + ' /User' + user

        print "cmd = ", cmd

        #Execute 'NET USE' command with authentication

        result = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=True).communicate()

        print "Executed: ", cmd

        if string.find(str(result), 'successfully',) == -1:

            print cmd, " FAILED"

            return -1

        #Mapped with first try

        return 1

    def unmapNetworkDrive(self, drive):

        #Check if the drive is in use

        if self.isAvailable(drive) == -1:

            #Drive is not in use

            return -1

        #Prepare 'NET USE' command

        cmd = 'net use ' + drive + ' /DELETE'

        result = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=True).communicate()

        if string.find(str(result), 'successfully',) == -1:

            return -1

        return 1

if __name__ == '__main__':

    man = VMManager.getInstance()

    #man.removeVM('SecurityDVM0')

    #man.netUse('192.168.56.134', 'USB\\')

    #ip = '192.168.56.139'

    #man.mapNetworkDrive('h:', '\\\\' + ip + '\USB', None, None)

    #man.cygwin_path = 'c:\\cygwin64\\bin\\'

    #man.handleDeviceChange()

    #print man.listSDVM()

    #man.configureHostNetworking()

    #new_vm = man.generateSDVMName()

    #man.createVM(new_vm)

    #man.genCertificateISO(new_vm)

    #man.attachCertificateISO(new_vm)

    #man.attachCertificateISO(vm_name)

    #man.sshGuestExecute(vm_name, "ls")

    man.sshGuestX11Execute('SecurityDVM1', '/usr/bin/iceweasel')

    time.sleep(60)

    #cmd = "c:\\cygwin64\\bin\\bash.exe --login -c \"/bin/ls\""

    #man.execute(cmd)