/mandos/trunk : revision 482

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# along with this program. If not, see

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# <http://www.gnu.org/licenses/>.

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#

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# Contact the authors at <mandos@recompile.se>.

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# Contact the authors at <mandos@fukt.bsnet.se>.

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#

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from __future__ import (division, absolute_import, print_function,

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import functools

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import cPickle as pickle

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import multiprocessing

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import types

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import binascii

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import tempfile

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import dbus

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import dbus.service

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import ctypes.util

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import xml.dom.minidom

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import inspect

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import GnuPGInterface

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try:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.4.1"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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version = "1.3.0"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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address = str("/dev/log")))

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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(ctypes.util.find_library("c"))

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.if_nametoindex)

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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"Get an interface index the hard way, i.e. using fcntl()"

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SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h

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with contextlib.closing(socket.socket()) as s:

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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struct.pack(str("16s16x"),

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interface))

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interface_index = struct.unpack(str("I"),

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ifreq[16:20])[0]

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return interface_index

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def initlogger(level=logging.WARNING):

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"""init logger and add loglevel"""

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syslogger.setFormatter(logging.Formatter

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('Mandos [%(process)d]: %(levelname)s:'

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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console.setFormatter(logging.Formatter('%(asctime)s %(name)s'

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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"""Exception if encryption/decryption fails"""

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pass

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class PGPEngine(object):

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"""A simple class for OpenPGP symmetric encryption & decryption"""

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def __init__(self):

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self.gnupg = GnuPGInterface.GnuPG()

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self.tempdir = tempfile.mkdtemp(prefix="mandos-")

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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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self.gnupg.options.extra_args.extend(['--force-mdc',

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'--quiet'])

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def __enter__(self):

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return self

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def __exit__ (self, exc_type, exc_value, traceback):

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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for root, dirs, files in os.walk(self.tempdir,

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topdown = False):

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for filename in files:

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os.remove(os.path.join(root, filename))

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for dirname in dirs:

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os.rmdir(os.path.join(root, dirname))

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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# Passphrase can not be empty and can not contain newlines or

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# NUL bytes. So we prefix it and hex encode it.

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return b"mandos" + binascii.hexlify(password)

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def encrypt(self, data, password):

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self.gnupg.passphrase = self.password_encode(password)

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with open(os.devnull) as devnull:

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try:

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proc = self.gnupg.run(['--symmetric'],

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create_fhs=['stdin', 'stdout'],

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attach_fhs={'stderr': devnull})

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with contextlib.closing(proc.handles['stdin']) as f:

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f.write(data)

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with contextlib.closing(proc.handles['stdout']) as f:

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ciphertext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return ciphertext

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def decrypt(self, data, password):

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self.gnupg.passphrase = self.password_encode(password)

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with open(os.devnull) as devnull:

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try:

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proc = self.gnupg.run(['--decrypt'],

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create_fhs=['stdin', 'stdout'],

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attach_fhs={'stderr': devnull})

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with contextlib.closing(proc.handles['stdin'] ) as f:

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f.write(data)

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with contextlib.closing(proc.handles['stdout']) as f:

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decrypted_plaintext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return decrypted_plaintext

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syslogger.setFormatter(logging.Formatter

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('Mandos [%(process)d]: %(levelname)s:'

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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class AvahiError(Exception):

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def __init__(self, value, *args, **kwargs):

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" after %i retries, exiting.",

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self.rename_count)

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raise AvahiServiceError("Too many renames")

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self.name = unicode(self.server

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.GetAlternativeServiceName(self.name))

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self.name = unicode(self.server.GetAlternativeServiceName(self.name))

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logger.info("Changing Zeroconf service name to %r ...",

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self.name)

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syslogger.setFormatter(logging.Formatter

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('Mandos (%s) [%%(process)d]:'

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' %%(levelname)s: %%(message)s'

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% self.name))

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self.remove()

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try:

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self.add()

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self.rename_count += 1

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def remove(self):

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"""Derived from the Avahi example code"""

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException) as e:

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pass

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self.group = None

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match.remove()

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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"""Derived from the Avahi example code"""

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self.remove()

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if self.group is None:

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self.group = dbus.Interface(

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self.bus.get_object(avahi.DBUS_NAME,

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self.server.EntryGroupNew()),

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.group = dbus.Interface(

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self.bus.get_object(avahi.DBUS_NAME,

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self.server.EntryGroupNew(),

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follow_name_owner_changes=True),

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.entry_group_state_changed_match = (

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self.group.connect_to_signal(

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'StateChanged', self.entry_group_state_changed))

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'StateChanged', self .entry_group_state_changed))

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logger.debug("Adding Zeroconf service '%s' of type '%s' ...",

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self.name, self.type)

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self.group.AddService(

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% unicode(error))

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def cleanup(self):

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"""Derived from the Avahi example code"""

326

if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException):

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pass

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self.group = None

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self.remove()

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def server_state_changed(self, state, error=None):

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"""Derived from the Avahi example code"""

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avahi.SERVER_FAILURE:

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"Zeroconf server failure" }

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if state in bad_states:

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if bad_states[state] is not None:

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if error is None:

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logger.error(bad_states[state])

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else:

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logger.error(bad_states[state] + ": %r", error)

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self.cleanup()

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if bad_states[state]:

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logger.error(bad_states[state])

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self.remove()

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elif state == avahi.SERVER_RUNNING:

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self.add()

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else:

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if error is None:

355

logger.debug("Unknown state: %r", state)

356

else:

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logger.debug("Unknown state: %r: %r", state, error)

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logger.debug("Unknown state: %r", state)

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def activate(self):

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"""Derived from the Avahi example code"""

360

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if self.server is None:

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self.server_state_changed)

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self.server_state_changed(self.server.GetState())

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class AvahiServiceToSyslog(AvahiService):

371

def rename(self):

372

"""Add the new name to the syslog messages"""

373

ret = AvahiService.rename(self)

374

syslogger.setFormatter(logging.Formatter

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('Mandos (%s) [%%(process)d]:'

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' %%(levelname)s: %%(message)s'

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% self.name))

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return ret

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def timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

382

return ((td.days * 24 * 60 * 60 * 1000)

383

+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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386

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class Client(object):

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"""A representation of a client host served by this server.

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Attributes:

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approved: bool(); 'None' if not yet approved/disapproved

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_approved: bool(); 'None' if not yet approved/disapproved

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approval_delay: datetime.timedelta(); Time to wait for approval

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approval_duration: datetime.timedelta(); Duration of one approval

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checker: subprocess.Popen(); a running checker process used

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instance %(name)s can be used in the command.

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checker_initiator_tag: a gobject event source tag, or None

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created: datetime.datetime(); (UTC) object creation

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client_structure: Object describing what attributes a client has

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and is used for storing the client at exit

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current_checker_command: string; current running checker_command

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disable_hook: If set, called by disable() as disable_hook(self)

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disable_initiator_tag: a gobject event source tag, or None

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enabled: bool()

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fingerprint: string (40 or 32 hexadecimal digits); used to

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interval: datetime.timedelta(); How often to start a new checker

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last_approval_request: datetime.datetime(); (UTC) or None

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last_checked_ok: datetime.datetime(); (UTC) or None

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, or None.

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last_enabled: datetime.datetime(); (UTC) or None

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last_enabled: datetime.datetime(); (UTC)

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name: string; from the config file, used in log messages and

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D-Bus identifiers

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secret: bytestring; sent verbatim (over TLS) to client

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timeout: datetime.timedelta(); How long from last_checked_ok

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until this client is disabled

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extended_timeout: extra long timeout when password has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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expires: datetime.datetime(); time (UTC) when a client will be

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disabled, or None

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"""

428

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runtime_expansions = ("approval_delay", "approval_duration",

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"created", "enabled", "fingerprint",

431

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"host", "interval", "last_checked_ok",

432

298

"last_enabled", "name", "timeout")

433

client_defaults = { "timeout": "5m",

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"extended_timeout": "15m",

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"interval": "2m",

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"checker": "fping -q -- %%(host)s",

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"host": "",

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"approval_delay": "0s",

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"approval_duration": "1s",

440

"approved_by_default": "True",

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"enabled": "True",

442

}

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@staticmethod

301

def _timedelta_to_milliseconds(td):

302

"Convert a datetime.timedelta() to milliseconds"

303

return ((td.days * 24 * 60 * 60 * 1000)

304

+ (td.seconds * 1000)

305

+ (td.microseconds // 1000))

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444

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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

446

return timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

449

"Return the 'extended_timeout' attribute in milliseconds"

450

return timedelta_to_milliseconds(self.extended_timeout)

309

return self._timedelta_to_milliseconds(self.timeout)

451

310

452

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return timedelta_to_milliseconds(self.interval)

455

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return self._timedelta_to_milliseconds(self.interval)

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456

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def approval_delay_milliseconds(self):

457

return timedelta_to_milliseconds(self.approval_delay)

458

459

@staticmethod

460

def config_parser(config):

461

""" Construct a new dict of client settings of this form:

462

{ client_name: {setting_name: value, ...}, ...}

463

with exceptions for any special settings as defined above"""

464

settings = {}

465

for client_name in config.sections():

466

section = dict(config.items(client_name))

467

client = settings[client_name] = {}

468

469

client["host"] = section["host"]

470

# Reformat values from string types to Python types

471

client["approved_by_default"] = config.getboolean(

472

client_name, "approved_by_default")

473

client["enabled"] = config.getboolean(client_name, "enabled")

474

475

client["fingerprint"] = (section["fingerprint"].upper()

476

.replace(" ", ""))

477

if "secret" in section:

478

client["secret"] = section["secret"].decode("base64")

479

elif "secfile" in section:

480

with open(os.path.expanduser(os.path.expandvars

481

(section["secfile"])),

482

"rb") as secfile:

483

client["secret"] = secfile.read()

484

else:

485

raise TypeError("No secret or secfile for section %s"

486

% section)

487

client["timeout"] = string_to_delta(section["timeout"])

488

client["extended_timeout"] = string_to_delta(

489

section["extended_timeout"])

490

client["interval"] = string_to_delta(section["interval"])

491

client["approval_delay"] = string_to_delta(

492

section["approval_delay"])

493

client["approval_duration"] = string_to_delta(

494

section["approval_duration"])

495

client["checker_command"] = section["checker"]

496

client["last_approval_request"] = None

497

client["last_checked_ok"] = None

498

client["last_checker_status"] = None

499

if client["enabled"]:

500

client["last_enabled"] = datetime.datetime.utcnow()

501

client["expires"] = (datetime.datetime.utcnow()

502

+ client["timeout"])

503

else:

504

client["last_enabled"] = None

505

client["expires"] = None

506

507

return settings

508

509

510

def __init__(self, settings, name = None):

316

return self._timedelta_to_milliseconds(self.approval_delay)

317

318

def __init__(self, name = None, disable_hook=None, config=None):

511

319

"""Note: the 'checker' key in 'config' sets the

512

320

'checker_command' attribute and *not* the 'checker'

513

321

attribute."""

514

322

self.name = name

515

# adding all client settings

516

for setting, value in settings.iteritems():

517

setattr(self, setting, value)

518

323

if config is None:

324

config = {}

519

325

logger.debug("Creating client %r", self.name)

520

326

# Uppercase and remove spaces from fingerprint for later

521

327

# comparison purposes with return value from the fingerprint()

522

328

# function

329

self.fingerprint = (config["fingerprint"].upper()

330

.replace(" ", ""))

523

331

logger.debug(" Fingerprint: %s", self.fingerprint)

524

self.created = settings.get("created", datetime.datetime.utcnow())

525

526

# attributes specific for this server instance

332

if "secret" in config:

333

self.secret = config["secret"].decode("base64")

334

elif "secfile" in config:

335

with open(os.path.expanduser(os.path.expandvars

336

(config["secfile"])),

337

"rb") as secfile:

338

self.secret = secfile.read()

339

else:

340

raise TypeError("No secret or secfile for client %s"

341

% self.name)

342

self.host = config.get("host", "")

343

self.created = datetime.datetime.utcnow()

344

self.enabled = False

345

self.last_approval_request = None

346

self.last_enabled = None

347

self.last_checked_ok = None

348

self.timeout = string_to_delta(config["timeout"])

349

self.interval = string_to_delta(config["interval"])

350

self.disable_hook = disable_hook

527

351

self.checker = None

528

352

self.checker_initiator_tag = None

529

353

self.disable_initiator_tag = None

530

354

self.checker_callback_tag = None

355

self.checker_command = config["checker"]

531

356

self.current_checker_command = None

532

self.approved = None

357

self.last_connect = None

358

self._approved = None

359

self.approved_by_default = config.get("approved_by_default",

360

True)

533

361

self.approvals_pending = 0

534

self.changedstate = (multiprocessing_manager

535

.Condition(multiprocessing_manager

536

.Lock()))

537

self.client_structure = [attr for attr in

538

self.__dict__.iterkeys()

539

if not attr.startswith("_")]

540

self.client_structure.append("client_structure")

541

542

for name, t in inspect.getmembers(type(self),

543

lambda obj:

544

isinstance(obj,

545

property)):

546

if not name.startswith("_"):

547

self.client_structure.append(name)

362

self.approval_delay = string_to_delta(

363

config["approval_delay"])

364

self.approval_duration = string_to_delta(

365

config["approval_duration"])

366

self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())

548

367

549

# Send notice to process children that client state has changed

550

368

def send_changedstate(self):

551

with self.changedstate:

552

self.changedstate.notify_all()

553

369

self.changedstate.acquire()

370

self.changedstate.notify_all()

371

self.changedstate.release()

372

554

373

def enable(self):

555

374

"""Start this client's checker and timeout hooks"""

556

375

if getattr(self, "enabled", False):

557

376

# Already enabled

558

377

return

559

378

self.send_changedstate()

560

self.expires = datetime.datetime.utcnow() + self.timeout

561

self.enabled = True

562

379

self.last_enabled = datetime.datetime.utcnow()

563

self.init_checker()

380

# Schedule a new checker to be started an 'interval' from now,

381

# and every interval from then on.

382

self.checker_initiator_tag = (gobject.timeout_add

383

(self.interval_milliseconds(),

384

self.start_checker))

385

# Schedule a disable() when 'timeout' has passed

386

self.disable_initiator_tag = (gobject.timeout_add

387

(self.timeout_milliseconds(),

388

self.disable))

389

self.enabled = True

390

# Also start a new checker *right now*.

391

self.start_checker()

564

392

565

393

def disable(self, quiet=True):

566

394

"""Disable this client."""

573

401

if getattr(self, "disable_initiator_tag", False):

574

402

gobject.source_remove(self.disable_initiator_tag)

575

403

self.disable_initiator_tag = None

576

self.expires = None

577

404

if getattr(self, "checker_initiator_tag", False):

578

405

gobject.source_remove(self.checker_initiator_tag)

579

406

self.checker_initiator_tag = None

580

407

self.stop_checker()

408

if self.disable_hook:

409

self.disable_hook(self)

581

410

self.enabled = False

582

411

# Do not run this again if called by a gobject.timeout_add

583

412

return False

584

413

585

414

def __del__(self):

415

self.disable_hook = None

586

416

self.disable()

587

417

588

def init_checker(self):

589

# Schedule a new checker to be started an 'interval' from now,

590

# and every interval from then on.

591

self.checker_initiator_tag = (gobject.timeout_add

592

(self.interval_milliseconds(),

593

self.start_checker))

594

# Schedule a disable() when 'timeout' has passed

595

self.disable_initiator_tag = (gobject.timeout_add

596

(self.timeout_milliseconds(),

597

self.disable))

598

# Also start a new checker *right now*.

599

self.start_checker()

600

601

418

def checker_callback(self, pid, condition, command):

602

419

"""The checker has completed, so take appropriate actions."""

603

420

self.checker_callback_tag = None

604

421

self.checker = None

605

422

if os.WIFEXITED(condition):

606

self.last_checker_status = os.WEXITSTATUS(condition)

607

if self.last_checker_status == 0:

423

exitstatus = os.WEXITSTATUS(condition)

424

if exitstatus == 0:

608

425

logger.info("Checker for %(name)s succeeded",

609

426

vars(self))

610

427

self.checked_ok()

612

429

logger.info("Checker for %(name)s failed",

613

430

vars(self))

614

431

else:

615

self.last_checker_status = -1

616

432

logger.warning("Checker for %(name)s crashed?",

617

433

vars(self))

618

434

619

def checked_ok(self, timeout=None):

435

def checked_ok(self):

620

436

"""Bump up the timeout for this client.

621

437

622

438

This should only be called when the client has been seen,

623

439

alive and well.

624

440

"""

625

if timeout is None:

626

timeout = self.timeout

627

441

self.last_checked_ok = datetime.datetime.utcnow()

628

if self.disable_initiator_tag is not None:

629

gobject.source_remove(self.disable_initiator_tag)

630

if getattr(self, "enabled", False):

631

self.disable_initiator_tag = (gobject.timeout_add

632

(timedelta_to_milliseconds

633

(timeout), self.disable))

634

self.expires = datetime.datetime.utcnow() + timeout

442

gobject.source_remove(self.disable_initiator_tag)

443

self.disable_initiator_tag = (gobject.timeout_add

444

(self.timeout_milliseconds(),

445

self.disable))

635

446

636

447

def need_approval(self):

637

448

self.last_approval_request = datetime.datetime.utcnow()

677

488

'replace')))

678

489

for attr in

679

490

self.runtime_expansions)

680

491

681

492

try:

682

493

command = self.checker_command % escaped_attrs

683

494

except TypeError as error:

729

540

raise

730

541

self.checker = None

731

542

732

733

543

def dbus_service_property(dbus_interface, signature="v",

734

544

access="readwrite", byte_arrays=False):

735

545

"""Decorators for marking methods of a DBusObjectWithProperties to

781

591

782

592

class DBusObjectWithProperties(dbus.service.Object):

783

593

"""A D-Bus object with properties.

784

594

785

595

Classes inheriting from this can use the dbus_service_property

786

596

decorator to expose methods as D-Bus properties. It exposes the

787

597

standard Get(), Set(), and GetAll() methods on the D-Bus.

794

604

def _get_all_dbus_properties(self):

795

605

"""Returns a generator of (name, attribute) pairs

796

606

"""

797

return ((prop.__get__(self)._dbus_name, prop.__get__(self))

798

for cls in self.__class__.__mro__

607

return ((prop._dbus_name, prop)

799

608

for name, prop in

800

inspect.getmembers(cls, self._is_dbus_property))

609

inspect.getmembers(self, self._is_dbus_property))

801

610

802

611

def _get_dbus_property(self, interface_name, property_name):

803

612

"""Returns a bound method if one exists which is a D-Bus

804

613

property with the specified name and interface.

805

614

"""

806

for cls in self.__class__.__mro__:

807

for name, value in (inspect.getmembers

808

(cls, self._is_dbus_property)):

809

if (value._dbus_name == property_name

810

and value._dbus_interface == interface_name):

811

return value.__get__(self)

812

615

for name in (property_name,

616

property_name + "_dbus_property"):

617

prop = getattr(self, name, None)

618

if (prop is None

619

or not self._is_dbus_property(prop)

620

or prop._dbus_name != property_name

621

or (interface_name and prop._dbus_interface

622

and interface_name != prop._dbus_interface)):

623

continue

624

return prop

813

625

# No such property

814

626

raise DBusPropertyNotFound(self.dbus_object_path + ":"

815

627

+ interface_name + "."

849

661

def GetAll(self, interface_name):

850

662

"""Standard D-Bus property GetAll() method, see D-Bus

851

663

standard.

852

664

853

665

Note: Will not include properties with access="write".

854

666

"""

855

properties = {}

667

all = {}

856

668

for name, prop in self._get_all_dbus_properties():

857

669

if (interface_name

858

670

and interface_name != prop._dbus_interface):

863

675

continue

864

676

value = prop()

865

677

if not hasattr(value, "variant_level"):

866

properties[name] = value

678

all[name] = value

867

679

continue

868

properties[name] = type(value)(value, variant_level=

869

value.variant_level+1)

870

return dbus.Dictionary(properties, signature="sv")

680

all[name] = type(value)(value, variant_level=

681

value.variant_level+1)

682

return dbus.Dictionary(all, signature="sv")

871

683

872

684

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

873

685

out_signature="s",

917

729

return xmlstring

918

730

919

731

920

def datetime_to_dbus (dt, variant_level=0):

921

"""Convert a UTC datetime.datetime() to a D-Bus type."""

922

if dt is None:

923

return dbus.String("", variant_level = variant_level)

924

return dbus.String(dt.isoformat(),

925

variant_level=variant_level)

926

927

928

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

929

.__metaclass__):

930

"""Applied to an empty subclass of a D-Bus object, this metaclass

931

will add additional D-Bus attributes matching a certain pattern.

932

"""

933

def __new__(mcs, name, bases, attr):

934

# Go through all the base classes which could have D-Bus

935

# methods, signals, or properties in them

936

for base in (b for b in bases

937

if issubclass(b, dbus.service.Object)):

938

# Go though all attributes of the base class

939

for attrname, attribute in inspect.getmembers(base):

940

# Ignore non-D-Bus attributes, and D-Bus attributes

941

# with the wrong interface name

942

if (not hasattr(attribute, "_dbus_interface")

943

or not attribute._dbus_interface

944

.startswith("se.recompile.Mandos")):

945

continue

946

# Create an alternate D-Bus interface name based on

947

# the current name

948

alt_interface = (attribute._dbus_interface

949

.replace("se.recompile.Mandos",

950

"se.bsnet.fukt.Mandos"))

951

# Is this a D-Bus signal?

952

if getattr(attribute, "_dbus_is_signal", False):

953

# Extract the original non-method function by

954

# black magic

955

nonmethod_func = (dict(

956

zip(attribute.func_code.co_freevars,

957

attribute.__closure__))["func"]

958

.cell_contents)

959

# Create a new, but exactly alike, function

960

# object, and decorate it to be a new D-Bus signal

961

# with the alternate D-Bus interface name

962

new_function = (dbus.service.signal

963

(alt_interface,

964

attribute._dbus_signature)

965

(types.FunctionType(

966

nonmethod_func.func_code,

967

nonmethod_func.func_globals,

968

nonmethod_func.func_name,

969

nonmethod_func.func_defaults,

970

nonmethod_func.func_closure)))

971

# Define a creator of a function to call both the

972

# old and new functions, so both the old and new

973

# signals gets sent when the function is called

974

def fixscope(func1, func2):

975

"""This function is a scope container to pass

976

func1 and func2 to the "call_both" function

977

outside of its arguments"""

978

def call_both(*args, **kwargs):

979

"""This function will emit two D-Bus

980

signals by calling func1 and func2"""

981

func1(*args, **kwargs)

982

func2(*args, **kwargs)

983

return call_both

984

# Create the "call_both" function and add it to

985

# the class

986

attr[attrname] = fixscope(attribute,

987

new_function)

988

# Is this a D-Bus method?

989

elif getattr(attribute, "_dbus_is_method", False):

990

# Create a new, but exactly alike, function

991

# object. Decorate it to be a new D-Bus method

992

# with the alternate D-Bus interface name. Add it

993

# to the class.

994

attr[attrname] = (dbus.service.method

995

(alt_interface,

996

attribute._dbus_in_signature,

997

attribute._dbus_out_signature)

998

(types.FunctionType

999

(attribute.func_code,

1000

attribute.func_globals,

1001

attribute.func_name,

1002

attribute.func_defaults,

1003

attribute.func_closure)))

1004

# Is this a D-Bus property?

1005

elif getattr(attribute, "_dbus_is_property", False):

1006

# Create a new, but exactly alike, function

1007

# object, and decorate it to be a new D-Bus

1008

# property with the alternate D-Bus interface

1009

# name. Add it to the class.

1010

attr[attrname] = (dbus_service_property

1011

(alt_interface,

1012

attribute._dbus_signature,

1013

attribute._dbus_access,

1014

attribute

1015

._dbus_get_args_options

1016

["byte_arrays"])

1017

(types.FunctionType

1018

(attribute.func_code,

1019

attribute.func_globals,

1020

attribute.func_name,

1021

attribute.func_defaults,

1022

attribute.func_closure)))

1023

return type.__new__(mcs, name, bases, attr)

1024

1025

1026

732

class ClientDBus(Client, DBusObjectWithProperties):

1027

733

"""A Client class using D-Bus

1028

734

1037

743

# dbus.service.Object doesn't use super(), so we can't either.

1038

744

1039

745

def __init__(self, bus = None, *args, **kwargs):

746

self._approvals_pending = 0

1040

747

self.bus = bus

1041

748

Client.__init__(self, *args, **kwargs)

1042

self._approvals_pending = 0

1043

1044

self._approvals_pending = 0

1045

749

# Only now, when this client is initialized, can it show up on

1046

750

# the D-Bus

1047

751

client_object_name = unicode(self.name).translate(

1052

756

DBusObjectWithProperties.__init__(self, self.bus,

1053

757

self.dbus_object_path)

1054

758

1055

def notifychangeproperty(transform_func,

1056

dbus_name, type_func=lambda x: x,

1057

variant_level=1):

1058

""" Modify a variable so that it's a property which announces

1059

its changes to DBus.

1060

1061

transform_fun: Function that takes a value and a variant_level

1062

and transforms it to a D-Bus type.

1063

dbus_name: D-Bus name of the variable

1064

type_func: Function that transform the value before sending it

1065

to the D-Bus. Default: no transform

1066

variant_level: D-Bus variant level. Default: 1

1067

"""

1068

attrname = "_{0}".format(dbus_name)

1069

def setter(self, value):

1070

if hasattr(self, "dbus_object_path"):

1071

if (not hasattr(self, attrname) or

1072

type_func(getattr(self, attrname, None))

1073

!= type_func(value)):

1074

dbus_value = transform_func(type_func(value),

1075

variant_level

1076

=variant_level)

1077

self.PropertyChanged(dbus.String(dbus_name),

1078

dbus_value)

1079

setattr(self, attrname, value)

1080

1081

return property(lambda self: getattr(self, attrname), setter)

1082

1083

1084

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1085

approvals_pending = notifychangeproperty(dbus.Boolean,

1086

"ApprovalPending",

1087

type_func = bool)

1088

enabled = notifychangeproperty(dbus.Boolean, "Enabled")

1089

last_enabled = notifychangeproperty(datetime_to_dbus,

1090

"LastEnabled")

1091

checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",

1092

type_func = lambda checker:

1093

checker is not None)

1094

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1095

"LastCheckedOK")

1096

last_approval_request = notifychangeproperty(

1097

datetime_to_dbus, "LastApprovalRequest")

1098

approved_by_default = notifychangeproperty(dbus.Boolean,

1099

"ApprovedByDefault")

1100

approval_delay = notifychangeproperty(dbus.UInt64,

1101

"ApprovalDelay",

1102

type_func =

1103

timedelta_to_milliseconds)

1104

approval_duration = notifychangeproperty(

1105

dbus.UInt64, "ApprovalDuration",

1106

type_func = timedelta_to_milliseconds)

1107

host = notifychangeproperty(dbus.String, "Host")

1108

timeout = notifychangeproperty(dbus.UInt64, "Timeout",

1109

type_func =

1110

timedelta_to_milliseconds)

1111

extended_timeout = notifychangeproperty(

1112

dbus.UInt64, "ExtendedTimeout",

1113

type_func = timedelta_to_milliseconds)

1114

interval = notifychangeproperty(dbus.UInt64,

1115

"Interval",

1116

type_func =

1117

timedelta_to_milliseconds)

1118

checker_command = notifychangeproperty(dbus.String, "Checker")

1119

1120

del notifychangeproperty

759

def _get_approvals_pending(self):

760

return self._approvals_pending

761

def _set_approvals_pending(self, value):

762

old_value = self._approvals_pending

763

self._approvals_pending = value

764

bval = bool(value)

765

if (hasattr(self, "dbus_object_path")

766

and bval is not bool(old_value)):

767

dbus_bool = dbus.Boolean(bval, variant_level=1)

768

self.PropertyChanged(dbus.String("ApprovalPending"),

769

dbus_bool)

770

771

approvals_pending = property(_get_approvals_pending,

772

_set_approvals_pending)

773

del _get_approvals_pending, _set_approvals_pending

774

775

@staticmethod

776

def _datetime_to_dbus(dt, variant_level=0):

777

"""Convert a UTC datetime.datetime() to a D-Bus type."""

778

return dbus.String(dt.isoformat(),

779

variant_level=variant_level)

780

781

def enable(self):

782

oldstate = getattr(self, "enabled", False)

783

r = Client.enable(self)

784

if oldstate != self.enabled:

785

# Emit D-Bus signals

786

self.PropertyChanged(dbus.String("Enabled"),

787

dbus.Boolean(True, variant_level=1))

788

self.PropertyChanged(

789

dbus.String("LastEnabled"),

790

self._datetime_to_dbus(self.last_enabled,

791

variant_level=1))

792

return r

793

794

def disable(self, quiet = False):

795

oldstate = getattr(self, "enabled", False)

796

r = Client.disable(self, quiet=quiet)

797

if not quiet and oldstate != self.enabled:

798

# Emit D-Bus signal

799

self.PropertyChanged(dbus.String("Enabled"),

800

dbus.Boolean(False, variant_level=1))

801

return r

1121

802

1122

803

def __del__(self, *args, **kwargs):

1123

804

try:

1132

813

*args, **kwargs):

1133

814

self.checker_callback_tag = None

1134

815

self.checker = None

816

# Emit D-Bus signal

817

self.PropertyChanged(dbus.String("CheckerRunning"),

818

dbus.Boolean(False, variant_level=1))

1135

819

if os.WIFEXITED(condition):

1136

820

exitstatus = os.WEXITSTATUS(condition)

1137

821

# Emit D-Bus signal

1147

831

return Client.checker_callback(self, pid, condition, command,

1148

832

*args, **kwargs)

1149

833

834

def checked_ok(self, *args, **kwargs):

835

Client.checked_ok(self, *args, **kwargs)

836

# Emit D-Bus signal

837

self.PropertyChanged(

838

dbus.String("LastCheckedOK"),

839

(self._datetime_to_dbus(self.last_checked_ok,

840

variant_level=1)))

841

842

def need_approval(self, *args, **kwargs):

843

r = Client.need_approval(self, *args, **kwargs)

844

# Emit D-Bus signal

845

self.PropertyChanged(

846

dbus.String("LastApprovalRequest"),

847

(self._datetime_to_dbus(self.last_approval_request,

848

variant_level=1)))

849

return r

850

1150

851

def start_checker(self, *args, **kwargs):

1151

852

old_checker = self.checker

1152

853

if self.checker is not None:

1159

860

and old_checker_pid != self.checker.pid):

1160

861

# Emit D-Bus signal

1161

862

self.CheckerStarted(self.current_checker_command)

863

self.PropertyChanged(

864

dbus.String("CheckerRunning"),

865

dbus.Boolean(True, variant_level=1))

1162

866

return r

1163

867

868

def stop_checker(self, *args, **kwargs):

869

old_checker = getattr(self, "checker", None)

870

r = Client.stop_checker(self, *args, **kwargs)

871

if (old_checker is not None

872

and getattr(self, "checker", None) is None):

873

self.PropertyChanged(dbus.String("CheckerRunning"),

874

dbus.Boolean(False, variant_level=1))

875

return r

876

1164

877

def _reset_approved(self):

1165

self.approved = None

878

self._approved = None

1166

879

return False

1167

880

1168

881

def approve(self, value=True):

1169

882

self.send_changedstate()

1170

self.approved = value

1171

gobject.timeout_add(timedelta_to_milliseconds

883

self._approved = value

884

gobject.timeout_add(self._timedelta_to_milliseconds

1172

885

(self.approval_duration),

1173

886

self._reset_approved)

1174

887

1175

888

1176

889

## D-Bus methods, signals & properties

1177

_interface = "se.recompile.Mandos.Client"

890

_interface = "se.bsnet.fukt.Mandos.Client"

1178

891

1179

892

## Signals

1180

893

1217

930

"D-Bus signal"

1218

931

return self.need_approval()

1219

932

1220

# NeRwequest - signal

1221

@dbus.service.signal(_interface, signature="s")

1222

def NewRequest(self, ip):

1223

"""D-Bus signal

1224

Is sent after a client request a password.

1225

"""

1226

pass

1227

1228

933

## Methods

1229

934

1230

935

# Approve - method

1274

979

if value is None: # get

1275

980

return dbus.Boolean(self.approved_by_default)

1276

981

self.approved_by_default = bool(value)

982

# Emit D-Bus signal

983

self.PropertyChanged(dbus.String("ApprovedByDefault"),

984

dbus.Boolean(value, variant_level=1))

1277

985

1278

986

# ApprovalDelay - property

1279

987

@dbus_service_property(_interface, signature="t",

1282

990

if value is None: # get

1283

991

return dbus.UInt64(self.approval_delay_milliseconds())

1284

992

self.approval_delay = datetime.timedelta(0, 0, 0, value)

993

# Emit D-Bus signal

994

self.PropertyChanged(dbus.String("ApprovalDelay"),

995

dbus.UInt64(value, variant_level=1))

1285

996

1286

997

# ApprovalDuration - property

1287

998

@dbus_service_property(_interface, signature="t",

1288

999

access="readwrite")

1289

1000

def ApprovalDuration_dbus_property(self, value=None):

1290

1001

if value is None: # get

1291

return dbus.UInt64(timedelta_to_milliseconds(

1002

return dbus.UInt64(self._timedelta_to_milliseconds(

1292

1003

self.approval_duration))

1293

1004

self.approval_duration = datetime.timedelta(0, 0, 0, value)

1005

# Emit D-Bus signal

1006

self.PropertyChanged(dbus.String("ApprovalDuration"),

1007

dbus.UInt64(value, variant_level=1))

1294

1008

1295

1009

# Name - property

1296

1010

@dbus_service_property(_interface, signature="s", access="read")

1308

1022

def Host_dbus_property(self, value=None):

1309

1023

if value is None: # get

1310

1024

return dbus.String(self.host)

1311

self.host = unicode(value)

1025

self.host = value

1026

# Emit D-Bus signal

1027

self.PropertyChanged(dbus.String("Host"),

1028

dbus.String(value, variant_level=1))

1312

1029

1313

1030

# Created - property

1314

1031

@dbus_service_property(_interface, signature="s", access="read")

1315

1032

def Created_dbus_property(self):

1316

return datetime_to_dbus(self.created)

1033

return dbus.String(self._datetime_to_dbus(self.created))

1317

1034

1318

1035

# LastEnabled - property

1319

1036

@dbus_service_property(_interface, signature="s", access="read")

1320

1037

def LastEnabled_dbus_property(self):

1321

return datetime_to_dbus(self.last_enabled)

1038

if self.last_enabled is None:

1039

return dbus.String("")

1040

return dbus.String(self._datetime_to_dbus(self.last_enabled))

1322

1041

1323

1042

# Enabled - property

1324

1043

@dbus_service_property(_interface, signature="b",

1338

1057

if value is not None:

1339

1058

self.checked_ok()

1340

1059

return

1341

return datetime_to_dbus(self.last_checked_ok)

1342

1343

# Expires - property

1344

@dbus_service_property(_interface, signature="s", access="read")

1345

def Expires_dbus_property(self):

1346

return datetime_to_dbus(self.expires)

1060

if self.last_checked_ok is None:

1061

return dbus.String("")

1062

return dbus.String(self._datetime_to_dbus(self

1063

.last_checked_ok))

1347

1064

1348

1065

# LastApprovalRequest - property

1349

1066

@dbus_service_property(_interface, signature="s", access="read")

1350

1067

def LastApprovalRequest_dbus_property(self):

1351

return datetime_to_dbus(self.last_approval_request)

1068

if self.last_approval_request is None:

1069

return dbus.String("")

1070

return dbus.String(self.

1071

_datetime_to_dbus(self

1072

.last_approval_request))

1352

1073

1353

1074

# Timeout - property

1354

1075

@dbus_service_property(_interface, signature="t",

1357

1078

if value is None: # get

1358

1079

return dbus.UInt64(self.timeout_milliseconds())

1359

1080

self.timeout = datetime.timedelta(0, 0, 0, value)

1081

# Emit D-Bus signal

1082

self.PropertyChanged(dbus.String("Timeout"),

1083

dbus.UInt64(value, variant_level=1))

1360

1084

if getattr(self, "disable_initiator_tag", None) is None:

1361

1085

return

1362

1086

# Reschedule timeout

1363

1087

gobject.source_remove(self.disable_initiator_tag)

1364

1088

self.disable_initiator_tag = None

1365

self.expires = None

1366

time_to_die = timedelta_to_milliseconds((self

1367

.last_checked_ok

1368

+ self.timeout)

1369

- datetime.datetime

1370

.utcnow())

1089

time_to_die = (self.

1090

_timedelta_to_milliseconds((self

1091

.last_checked_ok

1092

+ self.timeout)

1093

- datetime.datetime

1094

.utcnow()))

1371

1095

if time_to_die <= 0:

1372

1096

# The timeout has passed

1373

1097

self.disable()

1374

1098

else:

1375

self.expires = (datetime.datetime.utcnow()

1376

+ datetime.timedelta(milliseconds =

1377

time_to_die))

1378

1099

self.disable_initiator_tag = (gobject.timeout_add

1379

1100

(time_to_die, self.disable))

1380

1101

1381

# ExtendedTimeout - property

1382

@dbus_service_property(_interface, signature="t",

1383

access="readwrite")

1384

def ExtendedTimeout_dbus_property(self, value=None):

1385

if value is None: # get

1386

return dbus.UInt64(self.extended_timeout_milliseconds())

1387

self.extended_timeout = datetime.timedelta(0, 0, 0, value)

1388

1389

1102

# Interval - property

1390

1103

@dbus_service_property(_interface, signature="t",

1391

1104

access="readwrite")

1393

1106

if value is None: # get

1394

1107

return dbus.UInt64(self.interval_milliseconds())

1395

1108

self.interval = datetime.timedelta(0, 0, 0, value)

1109

# Emit D-Bus signal

1110

self.PropertyChanged(dbus.String("Interval"),

1111

dbus.UInt64(value, variant_level=1))

1396

1112

if getattr(self, "checker_initiator_tag", None) is None:

1397

1113

return

1398

if self.enabled:

1399

# Reschedule checker run

1400

gobject.source_remove(self.checker_initiator_tag)

1401

self.checker_initiator_tag = (gobject.timeout_add

1402

(value, self.start_checker))

1403

self.start_checker() # Start one now, too

1404

1114

# Reschedule checker run

1115

gobject.source_remove(self.checker_initiator_tag)

1116

self.checker_initiator_tag = (gobject.timeout_add

1117

(value, self.start_checker))

1118

self.start_checker() # Start one now, too

1119

1405

1120

# Checker - property

1406

1121

@dbus_service_property(_interface, signature="s",

1407

1122

access="readwrite")

1408

1123

def Checker_dbus_property(self, value=None):

1409

1124

if value is None: # get

1410

1125

return dbus.String(self.checker_command)

1411

self.checker_command = unicode(value)

1126

self.checker_command = value

1127

# Emit D-Bus signal

1128

self.PropertyChanged(dbus.String("Checker"),

1129

dbus.String(self.checker_command,

1130

variant_level=1))

1412

1131

1413

1132

# CheckerRunning - property

1414

1133

@dbus_service_property(_interface, signature="b",

1441

1160

self._pipe.send(('init', fpr, address))

1442

1161

if not self._pipe.recv():

1443

1162

raise KeyError()

1444

1163

1445

1164

def __getattribute__(self, name):

1446

if name == '_pipe':

1165

if(name == '_pipe'):

1447

1166

return super(ProxyClient, self).__getattribute__(name)

1448

1167

self._pipe.send(('getattr', name))

1449

1168

data = self._pipe.recv()

1454

1173

self._pipe.send(('funcall', name, args, kwargs))

1455

1174

return self._pipe.recv()[1]

1456

1175

return func

1457

1176

1458

1177

def __setattr__(self, name, value):

1459

if name == '_pipe':

1178

if(name == '_pipe'):

1460

1179

return super(ProxyClient, self).__setattr__(name, value)

1461

1180

self._pipe.send(('setattr', name, value))

1462

1181

1463

1182

1464

class ClientDBusTransitional(ClientDBus):

1465

__metaclass__ = AlternateDBusNamesMetaclass

1466

1467

1468

1183

class ClientHandler(socketserver.BaseRequestHandler, object):

1469

1184

"""A class to handle client connections.

1470

1185

1477

1192

unicode(self.client_address))

1478

1193

logger.debug("Pipe FD: %d",

1479

1194

self.server.child_pipe.fileno())

1480

1195

1481

1196

session = (gnutls.connection

1482

1197

.ClientSession(self.request,

1483

1198

gnutls.connection

1484

1199

.X509Credentials()))

1485

1200

1486

1201

# Note: gnutls.connection.X509Credentials is really a

1487

1202

# generic GnuTLS certificate credentials object so long as

1488

1203

# no X.509 keys are added to it. Therefore, we can use it

1489

1204

# here despite using OpenPGP certificates.

1490

1205

1491

1206

#priority = ':'.join(("NONE", "+VERS-TLS1.1",

1492

1207

# "+AES-256-CBC", "+SHA1",

1493

1208

# "+COMP-NULL", "+CTYPE-OPENPGP",

1499

1214

(gnutls.library.functions

1500

1215

.gnutls_priority_set_direct(session._c_object,

1501

1216

priority, None))

1502

1217

1503

1218

# Start communication using the Mandos protocol

1504

1219

# Get protocol number

1505

1220

line = self.request.makefile().readline()

1510

1225

except (ValueError, IndexError, RuntimeError) as error:

1511

1226

logger.error("Unknown protocol version: %s", error)

1512

1227

return

1513

1228

1514

1229

# Start GnuTLS connection

1515

1230

try:

1516

1231

session.handshake()

1520

1235

# established. Just abandon the request.

1521

1236

return

1522

1237

logger.debug("Handshake succeeded")

1523

1238

1524

1239

approval_required = False

1525

1240

try:

1526

1241

try:

1531

1246

logger.warning("Bad certificate: %s", error)

1532

1247

return

1533

1248

logger.debug("Fingerprint: %s", fpr)

1534

1249

1535

1250

try:

1536

1251

client = ProxyClient(child_pipe, fpr,

1537

1252

self.client_address)

1538

1253

except KeyError:

1539

1254

return

1540

1255

1541

if self.server.use_dbus:

1542

# Emit D-Bus signal

1543

client.NewRequest(str(self.client_address))

1544

1545

1256

if client.approval_delay:

1546

1257

delay = client.approval_delay

1547

1258

client.approvals_pending += 1

1549

1260

1550

1261

while True:

1551

1262

if not client.enabled:

1552

logger.info("Client %s is disabled",

1263

logger.warning("Client %s is disabled",

1553

1264

client.name)

1554

1265

if self.server.use_dbus:

1555

1266

# Emit D-Bus signal

1556

client.Rejected("Disabled")

1267

client.Rejected("Disabled")

1557

1268

return

1558

1269

1559

if client.approved or not client.approval_delay:

1270

if client._approved or not client.approval_delay:

1560

1271

#We are approved or approval is disabled

1561

1272

break

1562

elif client.approved is None:

1273

elif client._approved is None:

1563

1274

logger.info("Client %s needs approval",

1564

1275

client.name)

1565

1276

if self.server.use_dbus:

1576

1287

return

1577

1288

1578

1289

#wait until timeout or approved

1290

#x = float(client._timedelta_to_milliseconds(delay))

1579

1291

time = datetime.datetime.now()

1580

1292

client.changedstate.acquire()

1581

(client.changedstate.wait

1582

(float(client.timedelta_to_milliseconds(delay)

1583

/ 1000)))

1293

client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))

1584

1294

client.changedstate.release()

1585

1295

time2 = datetime.datetime.now()

1586

1296

if (time2 - time) >= delay:

1608

1318

sent, len(client.secret)

1609

1319

- (sent_size + sent))

1610

1320

sent_size += sent

1611

1321

1612

1322

logger.info("Sending secret to %s", client.name)

1613

# bump the timeout using extended_timeout

1614

client.checked_ok(client.extended_timeout)

1323

# bump the timeout as if seen

1324

client.checked_ok()

1615

1325

if self.server.use_dbus:

1616

1326

# Emit D-Bus signal

1617

1327

client.GotSecret()

1684

1394

# Convert the buffer to a Python bytestring

1685

1395

fpr = ctypes.string_at(buf, buf_len.value)

1686

1396

# Convert the bytestring to hexadecimal notation

1687

hex_fpr = binascii.hexlify(fpr).upper()

1397

hex_fpr = ''.join("%02X" % ord(char) for char in fpr)

1688

1398

return hex_fpr

1689

1399

1690

1400

1693

1403

def sub_process_main(self, request, address):

1694

1404

try:

1695

1405

self.finish_request(request, address)

1696

except Exception:

1406

except:

1697

1407

self.handle_error(request, address)

1698

1408

self.close_request(request)

1699

1409

1700

1410

def process_request(self, request, address):

1701

1411

"""Start a new process to process the request."""

1702

proc = multiprocessing.Process(target = self.sub_process_main,

1703

args = (request,

1704

address))

1705

proc.start()

1706

return proc

1707

1412

multiprocessing.Process(target = self.sub_process_main,

1413

args = (request, address)).start()

1708

1414

1709

1415

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1710

1416

""" adds a pipe to the MixIn """

1714

1420

This function creates a new pipe in self.pipe

1715

1421

"""

1716

1422

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1717

1718

proc = MultiprocessingMixIn.process_request(self, request,

1719

client_address)

1423

1424

super(MultiprocessingMixInWithPipe,

1425

self).process_request(request, client_address)

1720

1426

self.child_pipe.close()

1721

self.add_pipe(parent_pipe, proc)

1722

1723

def add_pipe(self, parent_pipe, proc):

1427

self.add_pipe(parent_pipe)

1428

1429

def add_pipe(self, parent_pipe):

1724

1430

"""Dummy function; override as necessary"""

1725

1431

raise NotImplementedError

1726

1432

1727

1728

1433

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1729

1434

socketserver.TCPServer, object):

1730

1435

"""IPv6-capable TCP server. Accepts 'None' as address and/or port

1804

1509

self.enabled = False

1805

1510

self.clients = clients

1806

1511

if self.clients is None:

1807

self.clients = {}

1512

self.clients = set()

1808

1513

self.use_dbus = use_dbus

1809

1514

self.gnutls_priority = gnutls_priority

1810

1515

IPv6_TCPServer.__init__(self, server_address,

1814

1519

def server_activate(self):

1815

1520

if self.enabled:

1816

1521

return socketserver.TCPServer.server_activate(self)

1817

1818

1522

def enable(self):

1819

1523

self.enabled = True

1820

1821

def add_pipe(self, parent_pipe, proc):

1524

def add_pipe(self, parent_pipe):

1822

1525

# Call "handle_ipc" for both data and EOF events

1823

1526

gobject.io_add_watch(parent_pipe.fileno(),

1824

1527

gobject.IO_IN | gobject.IO_HUP,

1825

1528

functools.partial(self.handle_ipc,

1826

parent_pipe =

1827

parent_pipe,

1828

proc = proc))

1829

1529

parent_pipe = parent_pipe))

1530

1830

1531

def handle_ipc(self, source, condition, parent_pipe=None,

1831

proc = None, client_object=None):

1532

client_object=None):

1832

1533

condition_names = {

1833

1534

gobject.IO_IN: "IN", # There is data to read.

1834

1535

gobject.IO_OUT: "OUT", # Data can be written (without

1843

1544

for cond, name in

1844

1545

condition_names.iteritems()

1845

1546

if cond & condition)

1846

# error, or the other end of multiprocessing.Pipe has closed

1547

# error or the other end of multiprocessing.Pipe has closed

1847

1548

if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):

1848

# Wait for other process to exit

1849

proc.join()

1850

1549

return False

1851

1550

1852

1551

# Read a request from the child

1857

1556

fpr = request[1]

1858

1557

address = request[2]

1859

1558

1860

for c in self.clients.itervalues():

1559

for c in self.clients:

1861

1560

if c.fingerprint == fpr:

1862

1561

client = c

1863

1562

break

1864

1563

else:

1865

logger.info("Client not found for fingerprint: %s, ad"

1866

"dress: %s", fpr, address)

1564

logger.warning("Client not found for fingerprint: %s, ad"

1565

"dress: %s", fpr, address)

1867

1566

if self.use_dbus:

1868

1567

# Emit D-Bus signal

1869

mandos_dbus_service.ClientNotFound(fpr,

1870

address[0])

1568

mandos_dbus_service.ClientNotFound(fpr, address[0])

1871

1569

parent_pipe.send(False)

1872

1570

return False

1873

1571

1874

1572

gobject.io_add_watch(parent_pipe.fileno(),

1875

1573

gobject.IO_IN | gobject.IO_HUP,

1876

1574

functools.partial(self.handle_ipc,

1877

parent_pipe =

1878

parent_pipe,

1879

proc = proc,

1880

client_object =

1881

client))

1575

parent_pipe = parent_pipe,

1576

client_object = client))

1882

1577

parent_pipe.send(True)

1883

# remove the old hook in favor of the new above hook on

1884

# same fileno

1578

# remove the old hook in favor of the new above hook on same fileno

1885

1579

return False

1886

1580

if command == 'funcall':

1887

1581

funcname = request[1]

1888

1582

args = request[2]

1889

1583

kwargs = request[3]

1890

1584

1891

parent_pipe.send(('data', getattr(client_object,

1892

funcname)(*args,

1893

**kwargs)))

1894

1585

parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))

1586

1895

1587

if command == 'getattr':

1896

1588

attrname = request[1]

1897

1589

if callable(client_object.__getattribute__(attrname)):

1898

1590

parent_pipe.send(('function',))

1899

1591

else:

1900

parent_pipe.send(('data', client_object

1901

.__getattribute__(attrname)))

1592

parent_pipe.send(('data', client_object.__getattribute__(attrname)))

1902

1593

1903

1594

if command == 'setattr':

1904

1595

attrname = request[1]

1905

1596

value = request[2]

1906

1597

setattr(client_object, attrname, value)

1907

1598

1908

1599

return True

1909

1600

1910

1601

1947

1638

return timevalue

1948

1639

1949

1640

1641

def if_nametoindex(interface):

1642

"""Call the C function if_nametoindex(), or equivalent

1643

1644

Note: This function cannot accept a unicode string."""

1645

global if_nametoindex

1646

try:

1647

if_nametoindex = (ctypes.cdll.LoadLibrary

1648

(ctypes.util.find_library("c"))

1649

.if_nametoindex)

1650

except (OSError, AttributeError):

1651

logger.warning("Doing if_nametoindex the hard way")

1652

def if_nametoindex(interface):

1653

"Get an interface index the hard way, i.e. using fcntl()"

1654

SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h

1655

with contextlib.closing(socket.socket()) as s:

1656

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1657

struct.pack(str("16s16x"),

1658

interface))

1659

interface_index = struct.unpack(str("I"),

1660

ifreq[16:20])[0]

1661

return interface_index

1662

return if_nametoindex(interface)

1663

1664

1950

1665

def daemon(nochdir = False, noclose = False):

1951

1666

"""See daemon(3). Standard BSD Unix function.

1952

1667

2007

1722

" system bus interface")

2008

1723

parser.add_argument("--no-ipv6", action="store_false",

2009

1724

dest="use_ipv6", help="Do not use IPv6")

2010

parser.add_argument("--no-restore", action="store_false",

2011

dest="restore", help="Do not restore stored"

2012

" state")

2013

parser.add_argument("--statedir", metavar="DIR",

2014

help="Directory to save/restore state in")

2015

2016

1725

options = parser.parse_args()

2017

1726

2018

1727

if options.check:

2031

1740

"use_dbus": "True",

2032

1741

"use_ipv6": "True",

2033

1742

"debuglevel": "",

2034

"restore": "True",

2035

"statedir": "/var/lib/mandos"

2036

1743

}

2037

1744

2038

1745

# Parse config file for server-global settings

2055

1762

# options, if set.

2056

1763

for option in ("interface", "address", "port", "debug",

2057

1764

"priority", "servicename", "configdir",

2058

"use_dbus", "use_ipv6", "debuglevel", "restore",

2059

"statedir"):

1765

"use_dbus", "use_ipv6", "debuglevel"):

2060

1766

value = getattr(options, option)

2061

1767

if value is not None:

2062

1768

server_settings[option] = value

2074

1780

debuglevel = server_settings["debuglevel"]

2075

1781

use_dbus = server_settings["use_dbus"]

2076

1782

use_ipv6 = server_settings["use_ipv6"]

2077

stored_state_path = os.path.join(server_settings["statedir"],

2078

stored_state_file)

2079

2080

if debug:

2081

initlogger(logging.DEBUG)

2082

else:

2083

if not debuglevel:

2084

initlogger()

2085

else:

2086

level = getattr(logging, debuglevel.upper())

2087

initlogger(level)

2088

1783

2089

1784

if server_settings["servicename"] != "Mandos":

2090

1785

syslogger.setFormatter(logging.Formatter

2091

1786

('Mandos (%s) [%%(process)d]:'

2093

1788

% server_settings["servicename"]))

2094

1789

2095

1790

# Parse config file with clients

2096

client_config = configparser.SafeConfigParser(Client.client_defaults)

1791

client_defaults = { "timeout": "1h",

1792

"interval": "5m",

1793

"checker": "fping -q -- %%(host)s",

1794

"host": "",

1795

"approval_delay": "0s",

1796

"approval_duration": "1s",

1797

}

1798

client_config = configparser.SafeConfigParser(client_defaults)

2097

1799

client_config.read(os.path.join(server_settings["configdir"],

2098

1800

"clients.conf"))

2099

1801

2137

1839

if error[0] != errno.EPERM:

2138

1840

raise error

2139

1841

1842

if not debug and not debuglevel:

1843

syslogger.setLevel(logging.WARNING)

1844

console.setLevel(logging.WARNING)

1845

if debuglevel:

1846

level = getattr(logging, debuglevel.upper())

1847

syslogger.setLevel(level)

1848

console.setLevel(level)

1849

2140

1850

if debug:

2141

1851

# Enable all possible GnuTLS debugging

2142

1852

2173

1883

# End of Avahi example code

2174

1884

if use_dbus:

2175

1885

try:

2176

bus_name = dbus.service.BusName("se.recompile.Mandos",

1886

bus_name = dbus.service.BusName("se.bsnet.fukt.Mandos",

2177

1887

bus, do_not_queue=True)

2178

old_bus_name = (dbus.service.BusName

2179

("se.bsnet.fukt.Mandos", bus,

2180

do_not_queue=True))

2181

1888

except dbus.exceptions.NameExistsException as e:

2182

1889

logger.error(unicode(e) + ", disabling D-Bus")

2183

1890

use_dbus = False

2184

1891

server_settings["use_dbus"] = False

2185

1892

tcp_server.use_dbus = False

2186

1893

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2187

service = AvahiServiceToSyslog(name =

2188

server_settings["servicename"],

2189

servicetype = "_mandos._tcp",

2190

protocol = protocol, bus = bus)

1894

service = AvahiService(name = server_settings["servicename"],

1895

servicetype = "_mandos._tcp",

1896

protocol = protocol, bus = bus)

2191

1897

if server_settings["interface"]:

2192

1898

service.interface = (if_nametoindex

2193

1899

(str(server_settings["interface"])))

2197

1903

2198

1904

client_class = Client

2199

1905

if use_dbus:

2200

client_class = functools.partial(ClientDBusTransitional,

2201

bus = bus)

2202

2203

client_settings = Client.config_parser(client_config)

2204

old_client_settings = {}

2205

clients_data = {}

2206

2207

# Get client data and settings from last running state.

2208

if server_settings["restore"]:

2209

try:

2210

with open(stored_state_path, "rb") as stored_state:

2211

clients_data, old_client_settings = (pickle.load

2212

(stored_state))

2213

os.remove(stored_state_path)

2214

except IOError as e:

2215

logger.warning("Could not load persistent state: {0}"

2216

.format(e))

2217

if e.errno != errno.ENOENT:

2218

raise

2219

2220

with PGPEngine() as pgp:

2221

for client_name, client in clients_data.iteritems():

2222

# Decide which value to use after restoring saved state.

2223

# We have three different values: Old config file,

2224

# new config file, and saved state.

2225

# New config value takes precedence if it differs from old

2226

# config value, otherwise use saved state.

2227

for name, value in client_settings[client_name].items():

2228

try:

2229

# For each value in new config, check if it

2230

# differs from the old config value (Except for

2231

# the "secret" attribute)

2232

if (name != "secret" and

2233

value != old_client_settings[client_name]

2234

[name]):

2235

client[name] = value

2236

except KeyError:

2237

pass

2238

2239

# Clients who has passed its expire date can still be

2240

# enabled if its last checker was successful. Clients

2241

# whose checker failed before we stored its state is

2242

# assumed to have failed all checkers during downtime.

2243

if client["enabled"]:

2244

if datetime.datetime.utcnow() >= client["expires"]:

2245

if not client["last_checked_ok"]:

2246

logger.warning(

2247

"disabling client {0} - Client never "

2248

"performed a successfull checker"

2249

.format(client["name"]))

2250

client["enabled"] = False

2251

elif client["last_checker_status"] != 0:

2252

logger.warning(

2253

"disabling client {0} - Client "

2254

"last checker failed with error code {1}"

2255

.format(client["name"],

2256

client["last_checker_status"]))

2257

client["enabled"] = False

2258

else:

2259

client["expires"] = (datetime.datetime

2260

.utcnow()

2261

+ client["timeout"])

2262

1906

client_class = functools.partial(ClientDBus, bus = bus)

1907

def client_config_items(config, section):

1908

special_settings = {

1909

"approved_by_default":

1910

lambda: config.getboolean(section,

1911

"approved_by_default"),

1912

}

1913

for name, value in config.items(section):

2263

1914

try:

2264

client["secret"] = (

2265

pgp.decrypt(client["encrypted_secret"],

2266

client_settings[client_name]

2267

["secret"]))

2268

except PGPError:

2269

# If decryption fails, we use secret from new settings

2270

logger.debug("Failed to decrypt {0} old secret"

2271

.format(client_name))

2272

client["secret"] = (

2273

client_settings[client_name]["secret"])

2274

2275

2276

# Add/remove clients based on new changes made to config

2277

for client_name in set(old_client_settings) - set(client_settings):

2278

del clients_data[client_name]

2279

for client_name in set(client_settings) - set(old_client_settings):

2280

clients_data[client_name] = client_settings[client_name]

2281

2282

# Create clients all clients

2283

for client_name, client in clients_data.iteritems():

2284

tcp_server.clients[client_name] = client_class(

2285

name = client_name, settings = client)

2286

1915

yield (name, special_settings[name]())

1916

except KeyError:

1917

yield (name, value)

1918

1919

tcp_server.clients.update(set(

1920

client_class(name = section,

1921

config= dict(client_config_items(

1922

client_config, section)))

1923

for section in client_config.sections()))

2287

1924

if not tcp_server.clients:

2288

1925

logger.warning("No clients defined")

2289

1926

2300

1937

# "pidfile" was never created

2301

1938

pass

2302

1939

del pidfilename

1940

2303

1941

signal.signal(signal.SIGINT, signal.SIG_IGN)

2304

1942

2305

1943

signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())

2306

1944

signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())

2307

1945

2310

1948

"""A D-Bus proxy object"""

2311

1949

def __init__(self):

2312

1950

dbus.service.Object.__init__(self, bus, "/")

2313

_interface = "se.recompile.Mandos"

1951

_interface = "se.bsnet.fukt.Mandos"

2314

1952

2315

1953

@dbus.service.signal(_interface, signature="o")

2316

1954

def ClientAdded(self, objpath):

2331

1969

def GetAllClients(self):

2332

1970

"D-Bus method"

2333

1971

return dbus.Array(c.dbus_object_path

2334

for c in

2335

tcp_server.clients.itervalues())

1972

for c in tcp_server.clients)

2336

1973

2337

1974

@dbus.service.method(_interface,

2338

1975

out_signature="a{oa{sv}}")

2340

1977

"D-Bus method"

2341

1978

return dbus.Dictionary(

2342

1979

((c.dbus_object_path, c.GetAll(""))

2343

for c in tcp_server.clients.itervalues()),

1980

for c in tcp_server.clients),

2344

1981

signature="oa{sv}")

2345

1982

2346

1983

@dbus.service.method(_interface, in_signature="o")

2347

1984

def RemoveClient(self, object_path):

2348

1985

"D-Bus method"

2349

for c in tcp_server.clients.itervalues():

1986

for c in tcp_server.clients:

2350

1987

if c.dbus_object_path == object_path:

2351

del tcp_server.clients[c.name]

1988

tcp_server.clients.remove(c)

2352

1989

c.remove_from_connection()

2353

1990

# Don't signal anything except ClientRemoved

2354

1991

c.disable(quiet=True)

2359

1996

2360

1997

del _interface

2361

1998

2362

class MandosDBusServiceTransitional(MandosDBusService):

2363

__metaclass__ = AlternateDBusNamesMetaclass

2364

mandos_dbus_service = MandosDBusServiceTransitional()

1999

mandos_dbus_service = MandosDBusService()

2365

2000

2366

2001

def cleanup():

2367

2002

"Cleanup function; run on exit"

2368

2003

service.cleanup()

2369

2004

2370

multiprocessing.active_children()

2371

if not (tcp_server.clients or client_settings):

2372

return

2373

2374

# Store client before exiting. Secrets are encrypted with key

2375

# based on what config file has. If config file is

2376

# removed/edited, old secret will thus be unrecovable.

2377

clients = {}

2378

with PGPEngine() as pgp:

2379

for client in tcp_server.clients.itervalues():

2380

key = client_settings[client.name]["secret"]

2381

client.encrypted_secret = pgp.encrypt(client.secret,

2382

key)

2383

client_dict = {}

2384

2385

# A list of attributes that can not be pickled

2386

# + secret.

2387

exclude = set(("bus", "changedstate", "secret",

2388

"checker"))

2389

for name, typ in (inspect.getmembers

2390

(dbus.service.Object)):

2391

exclude.add(name)

2392

2393

client_dict["encrypted_secret"] = (client

2394

.encrypted_secret)

2395

for attr in client.client_structure:

2396

if attr not in exclude:

2397

client_dict[attr] = getattr(client, attr)

2398

2399

clients[client.name] = client_dict

2400

del client_settings[client.name]["secret"]

2401

2402

try:

2403

with os.fdopen(os.open(stored_state_path,

2404

os.O_CREAT|os.O_WRONLY|os.O_TRUNC,

2405

0600), "wb") as stored_state:

2406

pickle.dump((clients, client_settings), stored_state)

2407

except (IOError, OSError) as e:

2408

logger.warning("Could not save persistent state: {0}"

2409

.format(e))

2410

if e.errno not in (errno.ENOENT, errno.EACCES):

2411

raise

2412

2413

# Delete all clients, and settings from config

2414

2005

while tcp_server.clients:

2415

name, client = tcp_server.clients.popitem()

2006

client = tcp_server.clients.pop()

2416

2007

if use_dbus:

2417

2008

client.remove_from_connection()

2009

client.disable_hook = None

2418

2010

# Don't signal anything except ClientRemoved

2419

2011

client.disable(quiet=True)

2420

2012

if use_dbus:

2421

2013

# Emit D-Bus signal

2422

mandos_dbus_service.ClientRemoved(client

2423

.dbus_object_path,

2014

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2424

2015

client.name)

2425

client_settings.clear()

2426

2016

2427

2017

atexit.register(cleanup)

2428

2018

2429

for client in tcp_server.clients.itervalues():

2019

for client in tcp_server.clients:

2430

2020

if use_dbus:

2431

2021

# Emit D-Bus signal

2432

2022

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2433

# Need to initiate checking of clients

2434

if client.enabled:

2435

client.init_checker()

2023

client.enable()

2436

2024

2437

2025

tcp_server.enable()

2438

2026

tcp_server.server_activate()