Synnefo » snf-image-creator

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"""This module hosts OS-specific code common for the various Microsoft

Windows OSs."""

from image_creator.os_type import OSBase, sysprep

from image_creator.util import FatalError, check_guestfs_version, get_command

import hivex

import tempfile

import os

import time

import random

import string

import subprocess

kvm = get_command('kvm')

BOOT_TIMEOUT = 300

class Windows(OSBase):

    """OS class for Windows"""

    def needed_sysprep_params(self):

        """Returns a list of needed sysprep parameters. Each element in the

        list is a SysprepParam object.

        """

        password = self.SysprepParam(

            'password', 'Image Administrator Password', 20, lambda x: True)

        return [password]

    @sysprep('Disabling IPv6 privacy extensions')

    def disable_ipv6_privacy_extensions(self):

        """Disable IPv6 privacy extensions"""

        self._guest_exec('netsh interface ipv6 set global '

                         'randomizeidentifiers=disabled store=persistent')

    @sysprep('Executing sysprep on the image (may take more that 10 minutes)')

    def microsoft_sysprep(self):

        """Run the Microsoft System Preparation Tool on the Image. This will

        remove system-specific data and will make the image ready to be

        deployed. After this no other task may run.

        """

        self._guest_exec(r'C:\Windows\system32\sysprep\sysprep '

                         r'/quiet /generalize /oobe /shutdown')

        self.syspreped = True

    def do_sysprep(self):

        """Prepare system for image creation."""

        if getattr(self, 'syspreped', False):

            raise FatalError("Image is already syspreped!")

        txt = "System preparation parameter: `%s' is needed but missing!"

        for param in self.needed_sysprep_params():

            if param[0] not in self.sysprep_params:

                raise FatalError(txt % param[0])

        self.mount(readonly=False)

        try:

            disabled_uac = self._update_uac_remote_setting(1)

            token = self._enable_os_monitor()

        finally:

            self.umount()

        self.out.output("Shutting down helper VM ...", False)

        self.g.sync()

        # guestfs_shutdown which is the prefered way to shutdown the backend

        # process was introduced in version 1.19.16

        if check_guestfs_version(self.g, 1, 19, 16) >= 0:

            ret = self.g.shutdown()

        else:

            ret = self.g.kill_subprocess()

        self.out.success('done')

        vm = None

        monitor = None

        try:

            self.out.output("Starting windows VM ...", False)

            monitorfd, monitor = tempfile.mkstemp()

            os.close(monitorfd)

            vm, display = self._create_vm(monitor)

            self.out.success("started (console on vnc display: %d)." % display)

            self.out.output("Waiting for OS to boot ...", False)

            if not self._wait_on_file(monitor, token):

                raise FatalError("Windows booting timed out.")

            else:

                self.out.success('done')

            self.out.output("Disabling automatic logon ...", False)

            self._disable_autologon()

            self.out.success('done')

            self.out.output('Preparing system from image creation:')

            tasks = self.list_syspreps()

            enabled = filter(lambda x: x.enabled, tasks)

            size = len(enabled)

            # Make sure the ms sysprep is the last task to run if it is enabled

            enabled = filter(

                lambda x: x.im_func.func_name != 'microsoft_sysprep', enabled)

            ms_sysprep_enabled = False

            if len(enabled) != size:

                enabled.append(self.ms_sysprep)

                ms_sysprep_enabled = True

            cnt = 0

            for task in enabled:

                cnt += 1

                self.out.output(('(%d/%d)' % (cnt, size)).ljust(7), False)

                task()

                setattr(task.im_func, 'executed', True)

            self.out.output("Shutting down windows VM ...", False)

            if not ms_sysprep_enabled:

                self._shutdown()

            self.out.success("done")

            vm.wait()

        finally:

            if monitor is not None:

                os.unlink(monitor)

            if vm is not None:

                self._destroy_vm(vm)

            self.out.output("Relaunching helper VM (may take a while) ...",

                            False)

            self.g.launch()

            self.out.success('done')

        if disabled_uac:

            self._update_uac_remote_setting(0)

    def _create_vm(self, monitor):

        """Create a VM with the image attached as the disk

            monitor: a file to be used to monitor when the OS is up

        """

        def random_mac():

            mac = [0x00, 0x16, 0x3e,

                   random.randint(0x00, 0x7f),

                   random.randint(0x00, 0xff),

                   random.randint(0x00, 0xff)]

            return ':'.join(map(lambda x: "%02x" % x, mac))

        # Use ganeti's VNC port range for a random vnc port

        vnc_port = random.randint(11000, 14999)

        display = vnc_port - 5900

        vm = kvm('-smp', '1', '-m', '1024', '-drive',

                 'file=%s,format=raw,cache=none,if=virtio' % self.image.device,

                 '-netdev', 'type=user,hostfwd=tcp::445-:445,id=netdev0',

                 '-device', 'virtio-net-pci,mac=%s,netdev=netdev0' %

                 random_mac(), '-vnc', ':%d' % display, '-serial',

                 'file:%s' % monitor, _bg=True)

        return vm, display

    def _destroy_vm(self, vm):

        """Destroy a VM previously created by _create_vm"""

        if vm.process.alive:

            vm.terminate()

    def _shutdown(self):

        """Shuts down the windows VM"""

        self._guest_exec(r'shutdown /s /t 5')

    def _wait_on_file(self, fname, msg):

        """Wait until a message appears on a file"""

        for i in range(BOOT_TIMEOUT):

            time.sleep(1)

            with open(fname) as f:

                for line in f:

                    if line.startswith(msg):

                        return True

        return False

    def _disable_autologon(self):

        """Disable automatic logon on the windows image"""

        winlogon = \

            r'"HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon"'

        self._guest_exec('REG DELETE %s /v DefaultUserName /f' % winlogon)

        self._guest_exec('REG DELETE %s /v DefaultPassword /f' % winlogon)

        self._guest_exec('REG DELETE %s /v AutoAdminLogon /f' % winlogon)

    def _registry_file_path(self, regfile):

        """Retrieves the case sensitive path to a registry file"""

        systemroot = self.g.inspect_get_windows_systemroot(self.root)

        path = "%s/system32/config/%s" % (systemroot, regfile)

        try:

            path = self.g.case_sensitive_path(path)

        except RuntimeError as e:

            raise FatalError("Unable to retrieve registry file: %s. Reason: %s"

                             % (regfile, str(e)))

        return path

    def _enable_os_monitor(self):

        """Add a script in the registry that will send a random string to the

        first serial port when the windows image finishes booting.

        """

        token = "".join(random.choice(string.ascii_letters) for x in range(16))

        path = self._registry_file_path('SOFTWARE')

        softwarefd, software = tempfile.mkstemp()

        try:

            os.close(softwarefd)

            self.g.download(path, software)

            h = hivex.Hivex(software, write=True)

            # Enable automatic logon.

            # This is needed because we need to execute a script that we add in

            # the RunOnce registry entry and those programs only get executed

            # when a user logs on. There is a RunServicesOnce registry entry

            # whose keys get executed in the background when the logon dialog

            # box first appears, but they seem to only work with services and

            # not arbitrary command line expressions :-(

            #

            # Instructions on how to turn on automatic logon in Windows can be

            # found here: http://support.microsoft.com/kb/324737

            #

            # Warning: Registry change will not work if the “Logon Banner” is

            # defined on the server either by a Group Policy object (GPO) or by

            # a local policy.

            winlogon = h.root()

            for child in ('Microsoft', 'Windows NT', 'CurrentVersion',

                          'Winlogon'):

                winlogon = h.node_get_child(winlogon, child)

            h.node_set_value(

                winlogon,

                {'key': 'DefaultUserName', 't': 1,

                 'value': "Administrator".encode('utf-16le')})

            h.node_set_value(

                winlogon,

                {'key': 'DefaultPassword', 't': 1,

                 'value':  self.sysprep_params['password'].encode('utf-16le')})

            h.node_set_value(

                winlogon,

                {'key': 'AutoAdminLogon', 't': 1,

                 'value': "1".encode('utf-16le')})

            key = h.root()

            for child in ('Microsoft', 'Windows', 'CurrentVersion'):

                key = h.node_get_child(key, child)

            runonce = h.node_get_child(key, "RunOnce")

            if runonce is None:

                runonce = h.node_add_child(key, "RunOnce")

            value = (

                r'C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe '

                r'-ExecutionPolicy RemoteSigned '

                r'"&{$port=new-Object System.IO.Ports.SerialPort COM1,9600,'

                r'None,8,one;$port.open();$port.WriteLine(\"' + token + r'\");'

                r'$port.Close()}"').encode('utf-16le')

            h.node_set_value(runonce,

                             {'key': "BootMonitor", 't': 1, 'value': value})

            h.commit(None)

            self.g.upload(software, path)

        finally:

            os.unlink(software)

        return token

    def _update_uac_remote_setting(self, value):

        """Updates the registry key value:

        [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies

        \System]"LocalAccountTokenFilterPolicy"

        value = 1 will disable the UAC remote restrictions

        value = 0 will enable the UAC remote restrictions

        For more info see here: http://support.microsoft.com/kb/951016

        Returns:

            True if the key is changed

            False if the key is unchanged

        """

        if value not in (0, 1):

            raise ValueError("Valid values for value parameter are 0 and 1")

        path = self._registry_file_path('SOFTWARE')

        softwarefd, software = tempfile.mkstemp()

        try:

            os.close(softwarefd)

            self.g.download(path, software)

            h = hivex.Hivex(software, write=True)

            key = h.root()

            for child in ('Microsoft', 'Windows', 'CurrentVersion', 'Policies',

                          'System'):

                key = h.node_get_child(key, child)

            policy = None

            for val in h.node_values(key):

                if h.value_key(val) == "LocalAccountTokenFilterPolicy":

                    policy = val

            if policy is not None:

                dword = h.value_dword(policy)

                if dword == value:

                    return False

            elif value == 0:

                return False

            new_value = {

                'key': "LocalAccountTokenFilterPolicy", 't': 4L,

                'value': '%s\x00\x00\x00' % '\x00' if value == 0 else '\x01'}

            h.node_set_value(key, new_value)

            h.commit(None)

            self.g.upload(software, path)

        finally:

            os.unlink(software)

        return True

    def _do_collect_metadata(self):

        """Collect metadata about the OS"""

        super(Windows, self)._do_collect_metadata()

        self.meta["USERS"] = " ".join(self._get_users())

    def _get_users(self):

        """Returns a list of users found in the images"""

        path = self._registry_file_path('SAM')

        samfd, sam = tempfile.mkstemp()

        try:

            os.close(samfd)

            self.g.download(path, sam)

            h = hivex.Hivex(sam)

            key = h.root()

            # Navigate to /SAM/Domains/Account/Users/Names

            for child in ('SAM', 'Domains', 'Account', 'Users', 'Names'):

                key = h.node_get_child(key, child)

            users = [h.node_name(x) for x in h.node_children(key)]

        finally:

            os.unlink(sam)

        # Filter out the guest account

        return filter(lambda x: x != "Guest", users)

    def _guest_exec(self, command, fatal=True):

        """Execute a command on a windows VM"""

        user = "Administrator%" + self.sysprep_params['password']

        addr = 'localhost'

        runas = '--runas=%s' % user

        winexe = subprocess.Popen(

            ['winexe', '-U', user, "//%s" % addr, runas, command],

            stdout=subprocess.PIPE, stderr=subprocess.PIPE)

        stdout, stderr = winexe.communicate()

        rc = winexe.poll()

        if rc != 0 and fatal:

            reason = stderr if len(stderr) else stdout

            raise FatalError("Command: `%s' failed. Reason: %s" %

                             (command, reason))

        return (stdout, stderr, rc)

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