/mandos/trunk : revision 471

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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 SocketServer as socketserver

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import socket

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import argparse

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import optparse

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import datetime

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import errno

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import gnutls.crypto

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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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SO_BINDTODEVICE = None

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version = "1.4.1"

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stored_state_file = "clients.pickle"

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version = "1.2.3"

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logger = logging.getLogger()

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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 CryptoError(Exception):

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pass

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class Crypto(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 CryptoError(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 CryptoError(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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self.group = None # our entry group

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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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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except dbus.exceptions.DBusException as error:

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except dbus.exceptions.DBusException, error:

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logger.critical("DBusException: %s", error)

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self.cleanup()

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os._exit(1)

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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.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.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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self.group.connect_to_signal('StateChanged',

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self

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.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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def cleanup(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):

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pass

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self.group.Free()

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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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def server_state_changed(self, state):

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

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logger.debug("Avahi server state change: %i", state)

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bad_states = { avahi.SERVER_INVALID:

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"Zeroconf server invalid",

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avahi.SERVER_REGISTERING: None,

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avahi.SERVER_COLLISION:

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"Zeroconf server name collision",

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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 state == avahi.SERVER_COLLISION:

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logger.error("Zeroconf server name collision")

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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:

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

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else:

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

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def activate(self):

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

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if self.server is None:

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self.server = dbus.Interface(

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self.bus.get_object(avahi.DBUS_NAME,

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avahi.DBUS_PATH_SERVER,

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follow_name_owner_changes=True),

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avahi.DBUS_PATH_SERVER),

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avahi.DBUS_INTERFACE_SERVER)

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self.server.connect_to_signal("StateChanged",

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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):

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def rename(self):

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

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ret = AvahiService.rename(self)

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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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return ret

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def _timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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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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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)

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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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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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@staticmethod

282

def _timedelta_to_milliseconds(td):

283

"Convert a datetime.timedelta() to milliseconds"

284

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

285

+ (td.seconds * 1000)

286

+ (td.microseconds // 1000))

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435

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def timeout_milliseconds(self):

436

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"Return the 'timeout' attribute in milliseconds"

437

return _timedelta_to_milliseconds(self.timeout)

438

439

def extended_timeout_milliseconds(self):

440

"Return the 'extended_timeout' attribute in milliseconds"

441

return _timedelta_to_milliseconds(self.extended_timeout)

290

return self._timedelta_to_milliseconds(self.timeout)

442

291

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def interval_milliseconds(self):

444

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"Return the 'interval' attribute in milliseconds"

445

return _timedelta_to_milliseconds(self.interval)

446

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return self._timedelta_to_milliseconds(self.interval)

295

447

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def approval_delay_milliseconds(self):

448

return _timedelta_to_milliseconds(self.approval_delay)

297

return self._timedelta_to_milliseconds(self.approval_delay)

449

298

450

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

299

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

451

300

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

452

301

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

453

302

attribute."""

473

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% self.name)

474

323

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

475

324

self.created = datetime.datetime.utcnow()

476

self.enabled = True

325

self.enabled = False

477

326

self.last_approval_request = None

478

self.last_enabled = datetime.datetime.utcnow()

327

self.last_enabled = None

479

328

self.last_checked_ok = None

480

self.last_checker_status = None

481

329

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

482

self.extended_timeout = string_to_delta(config

483

["extended_timeout"])

484

330

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

331

self.disable_hook = disable_hook

485

332

self.checker = None

486

333

self.checker_initiator_tag = None

487

334

self.disable_initiator_tag = None

488

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

489

335

self.checker_callback_tag = None

490

336

self.checker_command = config["checker"]

491

337

self.current_checker_command = None

338

self.last_connect = None

492

339

self._approved = None

493

340

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

494

341

True)

497

344

config["approval_delay"])

498

345

self.approval_duration = string_to_delta(

499

346

config["approval_duration"])

500

self.changedstate = (multiprocessing_manager

501

.Condition(multiprocessing_manager

502

.Lock()))

503

self.client_structure = [attr for attr in

504

self.__dict__.iterkeys()

505

if not attr.startswith("_")]

506

self.client_structure.append("client_structure")

507

508

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

509

lambda obj:

510

isinstance(obj,

511

property)):

512

if not name.startswith("_"):

513

self.client_structure.append(name)

347

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

514

348

515

# Send notice to process children that client state has changed

516

349

def send_changedstate(self):

517

with self.changedstate:

518

self.changedstate.notify_all()

519

350

self.changedstate.acquire()

351

self.changedstate.notify_all()

352

self.changedstate.release()

353

520

354

def enable(self):

521

355

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

522

356

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

523

357

# Already enabled

524

358

return

525

359

self.send_changedstate()

526

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

360

self.last_enabled = datetime.datetime.utcnow()

361

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

362

# and every interval from then on.

363

self.checker_initiator_tag = (gobject.timeout_add

364

(self.interval_milliseconds(),

365

self.start_checker))

366

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

367

self.disable_initiator_tag = (gobject.timeout_add

368

(self.timeout_milliseconds(),

369

self.disable))

527

370

self.enabled = True

528

self.last_enabled = datetime.datetime.utcnow()

529

self.init_checker()

371

# Also start a new checker *right now*.

372

self.start_checker()

530

373

531

374

def disable(self, quiet=True):

532

375

"""Disable this client."""

539

382

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

540

383

gobject.source_remove(self.disable_initiator_tag)

541

384

self.disable_initiator_tag = None

542

self.expires = None

543

385

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

544

386

gobject.source_remove(self.checker_initiator_tag)

545

387

self.checker_initiator_tag = None

546

388

self.stop_checker()

389

if self.disable_hook:

390

self.disable_hook(self)

547

391

self.enabled = False

548

392

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

549

393

return False

550

394

551

395

def __del__(self):

396

self.disable_hook = None

552

397

self.disable()

553

398

554

def init_checker(self):

555

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

556

# and every interval from then on.

557

self.checker_initiator_tag = (gobject.timeout_add

558

(self.interval_milliseconds(),

559

self.start_checker))

560

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

561

self.disable_initiator_tag = (gobject.timeout_add

562

(self.timeout_milliseconds(),

563

self.disable))

564

# Also start a new checker *right now*.

565

self.start_checker()

566

567

399

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

568

400

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

569

401

self.checker_callback_tag = None

570

402

self.checker = None

571

403

if os.WIFEXITED(condition):

572

self.last_checker_status = os.WEXITSTATUS(condition)

573

if self.last_checker_status == 0:

404

exitstatus = os.WEXITSTATUS(condition)

405

if exitstatus == 0:

574

406

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

575

407

vars(self))

576

408

self.checked_ok()

578

410

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

579

411

vars(self))

580

412

else:

581

self.last_checker_status = -1

582

413

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

583

414

vars(self))

584

415

585

def checked_ok(self, timeout=None):

416

def checked_ok(self):

586

417

"""Bump up the timeout for this client.

587

418

588

419

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

589

420

alive and well.

590

421

"""

591

if timeout is None:

592

timeout = self.timeout

593

422

self.last_checked_ok = datetime.datetime.utcnow()

594

if self.disable_initiator_tag is not None:

595

gobject.source_remove(self.disable_initiator_tag)

596

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

597

self.disable_initiator_tag = (gobject.timeout_add

598

(_timedelta_to_milliseconds

599

(timeout), self.disable))

600

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

423

gobject.source_remove(self.disable_initiator_tag)

424

self.disable_initiator_tag = (gobject.timeout_add

425

(self.timeout_milliseconds(),

426

self.disable))

601

427

602

428

def need_approval(self):

603

429

self.last_approval_request = datetime.datetime.utcnow()

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445

# If a checker exists, make sure it is not a zombie

620

446

try:

621

447

pid, status = os.waitpid(self.checker.pid, os.WNOHANG)

622

except (AttributeError, OSError) as error:

448

except (AttributeError, OSError), error:

623

449

if (isinstance(error, OSError)

624

450

and error.errno != errno.ECHILD):

625

451

raise error

643

469

'replace')))

644

470

for attr in

645

471

self.runtime_expansions)

646

472

647

473

try:

648

474

command = self.checker_command % escaped_attrs

649

except TypeError as error:

475

except TypeError, error:

650

476

logger.error('Could not format string "%s":'

651

477

' %s', self.checker_command, error)

652

478

return True # Try again later

671

497

if pid:

672

498

gobject.source_remove(self.checker_callback_tag)

673

499

self.checker_callback(pid, status, command)

674

except OSError as error:

500

except OSError, error:

675

501

logger.error("Failed to start subprocess: %s",

676

502

error)

677

503

# Re-run this periodically if run by gobject.timeout_add

690

516

#time.sleep(0.5)

691

517

#if self.checker.poll() is None:

692

518

# os.kill(self.checker.pid, signal.SIGKILL)

693

except OSError as error:

519

except OSError, error:

694

520

if error.errno != errno.ESRCH: # No such process

695

521

raise

696

522

self.checker = None

697

523

698

699

524

def dbus_service_property(dbus_interface, signature="v",

700

525

access="readwrite", byte_arrays=False):

701

526

"""Decorators for marking methods of a DBusObjectWithProperties to

747

572

748

573

class DBusObjectWithProperties(dbus.service.Object):

749

574

"""A D-Bus object with properties.

750

575

751

576

Classes inheriting from this can use the dbus_service_property

752

577

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

753

578

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

760

585

def _get_all_dbus_properties(self):

761

586

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

762

587

"""

763

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

764

for cls in self.__class__.__mro__

588

return ((prop._dbus_name, prop)

765

589

for name, prop in

766

inspect.getmembers(cls, self._is_dbus_property))

590

inspect.getmembers(self, self._is_dbus_property))

767

591

768

592

def _get_dbus_property(self, interface_name, property_name):

769

593

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

770

594

property with the specified name and interface.

771

595

"""

772

for cls in self.__class__.__mro__:

773

for name, value in (inspect.getmembers

774

(cls, self._is_dbus_property)):

775

if (value._dbus_name == property_name

776

and value._dbus_interface == interface_name):

777

return value.__get__(self)

778

596

for name in (property_name,

597

property_name + "_dbus_property"):

598

prop = getattr(self, name, None)

599

if (prop is None

600

or not self._is_dbus_property(prop)

601

or prop._dbus_name != property_name

602

or (interface_name and prop._dbus_interface

603

and interface_name != prop._dbus_interface)):

604

continue

605

return prop

779

606

# No such property

780

607

raise DBusPropertyNotFound(self.dbus_object_path + ":"

781

608

+ interface_name + "."

815

642

def GetAll(self, interface_name):

816

643

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

817

644

standard.

818

645

819

646

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

820

647

"""

821

properties = {}

648

all = {}

822

649

for name, prop in self._get_all_dbus_properties():

823

650

if (interface_name

824

651

and interface_name != prop._dbus_interface):

829

656

continue

830

657

value = prop()

831

658

if not hasattr(value, "variant_level"):

832

properties[name] = value

659

all[name] = value

833

660

continue

834

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

835

value.variant_level+1)

836

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

661

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

662

value.variant_level+1)

663

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

837

664

838

665

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

839

666

out_signature="s",

877

704

xmlstring = document.toxml("utf-8")

878

705

document.unlink()

879

706

except (AttributeError, xml.dom.DOMException,

880

xml.parsers.expat.ExpatError) as error:

707

xml.parsers.expat.ExpatError), error:

881

708

logger.error("Failed to override Introspection method",

882

709

error)

883

710

return xmlstring

884

711

885

712

886

def datetime_to_dbus (dt, variant_level=0):

887

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

888

if dt is None:

889

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

890

return dbus.String(dt.isoformat(),

891

variant_level=variant_level)

892

893

894

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

895

.__metaclass__):

896

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

897

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

898

"""

899

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

900

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

901

# methods, signals, or properties in them

902

for base in (b for b in bases

903

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

904

# Go though all attributes of the base class

905

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

906

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

907

# with the wrong interface name

908

if (not hasattr(attribute, "_dbus_interface")

909

or not attribute._dbus_interface

910

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

911

continue

912

# Create an alternate D-Bus interface name based on

913

# the current name

914

alt_interface = (attribute._dbus_interface

915

.replace("se.recompile.Mandos",

916

"se.bsnet.fukt.Mandos"))

917

# Is this a D-Bus signal?

918

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

919

# Extract the original non-method function by

920

# black magic

921

nonmethod_func = (dict(

922

zip(attribute.func_code.co_freevars,

923

attribute.__closure__))["func"]

924

.cell_contents)

925

# Create a new, but exactly alike, function

926

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

927

# with the alternate D-Bus interface name

928

new_function = (dbus.service.signal

929

(alt_interface,

930

attribute._dbus_signature)

931

(types.FunctionType(

932

nonmethod_func.func_code,

933

nonmethod_func.func_globals,

934

nonmethod_func.func_name,

935

nonmethod_func.func_defaults,

936

nonmethod_func.func_closure)))

937

# Define a creator of a function to call both the

938

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

939

# signals gets sent when the function is called

940

def fixscope(func1, func2):

941

"""This function is a scope container to pass

942

func1 and func2 to the "call_both" function

943

outside of its arguments"""

944

def call_both(*args, **kwargs):

945

"""This function will emit two D-Bus

946

signals by calling func1 and func2"""

947

func1(*args, **kwargs)

948

func2(*args, **kwargs)

949

return call_both

950

# Create the "call_both" function and add it to

951

# the class

952

attr[attrname] = fixscope(attribute,

953

new_function)

954

# Is this a D-Bus method?

955

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

956

# Create a new, but exactly alike, function

957

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

958

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

959

# to the class.

960

attr[attrname] = (dbus.service.method

961

(alt_interface,

962

attribute._dbus_in_signature,

963

attribute._dbus_out_signature)

964

(types.FunctionType

965

(attribute.func_code,

966

attribute.func_globals,

967

attribute.func_name,

968

attribute.func_defaults,

969

attribute.func_closure)))

970

# Is this a D-Bus property?

971

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

972

# Create a new, but exactly alike, function

973

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

974

# property with the alternate D-Bus interface

975

# name. Add it to the class.

976

attr[attrname] = (dbus_service_property

977

(alt_interface,

978

attribute._dbus_signature,

979

attribute._dbus_access,

980

attribute

981

._dbus_get_args_options

982

["byte_arrays"])

983

(types.FunctionType

984

(attribute.func_code,

985

attribute.func_globals,

986

attribute.func_name,

987

attribute.func_defaults,

988

attribute.func_closure)))

989

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

990

991

992

713

class ClientDBus(Client, DBusObjectWithProperties):

993

714

"""A Client class using D-Bus

994

715

1003

724

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

1004

725

1005

726

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

727

self._approvals_pending = 0

1006

728

self.bus = bus

1007

729

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

1008

1009

self._approvals_pending = 0

1010

730

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

1011

731

# the D-Bus

1012

732

client_object_name = unicode(self.name).translate(

1017

737

DBusObjectWithProperties.__init__(self, self.bus,

1018

738

self.dbus_object_path)

1019

739

1020

def notifychangeproperty(transform_func,

1021

dbus_name, type_func=lambda x: x,

1022

variant_level=1):

1023

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

1024

its changes to DBus.

1025

1026

transform_fun: Function that takes a value and a variant_level

1027

and transforms it to a D-Bus type.

1028

dbus_name: D-Bus name of the variable

1029

type_func: Function that transform the value before sending it

1030

to the D-Bus. Default: no transform

1031

variant_level: D-Bus variant level. Default: 1

1032

"""

1033

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

1034

def setter(self, value):

1035

if hasattr(self, "dbus_object_path"):

1036

if (not hasattr(self, attrname) or

1037

type_func(getattr(self, attrname, None))

1038

!= type_func(value)):

1039

dbus_value = transform_func(type_func(value),

1040

variant_level

1041

=variant_level)

1042

self.PropertyChanged(dbus.String(dbus_name),

1043

dbus_value)

1044

setattr(self, attrname, value)

1045

1046

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

1047

1048

1049

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1050

approvals_pending = notifychangeproperty(dbus.Boolean,

1051

"ApprovalPending",

1052

type_func = bool)

1053

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

1054

last_enabled = notifychangeproperty(datetime_to_dbus,

1055

"LastEnabled")

1056

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

1057

type_func = lambda checker:

1058

checker is not None)

1059

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1060

"LastCheckedOK")

1061

last_approval_request = notifychangeproperty(

1062

datetime_to_dbus, "LastApprovalRequest")

1063

approved_by_default = notifychangeproperty(dbus.Boolean,

1064

"ApprovedByDefault")

1065

approval_delay = notifychangeproperty(dbus.UInt16,

1066

"ApprovalDelay",

1067

type_func =

1068

_timedelta_to_milliseconds)

1069

approval_duration = notifychangeproperty(

1070

dbus.UInt16, "ApprovalDuration",

1071

type_func = _timedelta_to_milliseconds)

1072

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

1073

timeout = notifychangeproperty(dbus.UInt16, "Timeout",

1074

type_func =

1075

_timedelta_to_milliseconds)

1076

extended_timeout = notifychangeproperty(

1077

dbus.UInt16, "ExtendedTimeout",

1078

type_func = _timedelta_to_milliseconds)

1079

interval = notifychangeproperty(dbus.UInt16,

1080

"Interval",

1081

type_func =

1082

_timedelta_to_milliseconds)

1083

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

1084

1085

del notifychangeproperty

740

def _get_approvals_pending(self):

741

return self._approvals_pending

742

def _set_approvals_pending(self, value):

743

old_value = self._approvals_pending

744

self._approvals_pending = value

745

bval = bool(value)

746

if (hasattr(self, "dbus_object_path")

747

and bval is not bool(old_value)):

748

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

749

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

750

dbus_bool)

751

752

approvals_pending = property(_get_approvals_pending,

753

_set_approvals_pending)

754

del _get_approvals_pending, _set_approvals_pending

755

756

@staticmethod

757

def _datetime_to_dbus(dt, variant_level=0):

758

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

759

return dbus.String(dt.isoformat(),

760

variant_level=variant_level)

761

762

def enable(self):

763

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

764

r = Client.enable(self)

765

if oldstate != self.enabled:

766

# Emit D-Bus signals

767

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

768

dbus.Boolean(True, variant_level=1))

769

self.PropertyChanged(

770

dbus.String("LastEnabled"),

771

self._datetime_to_dbus(self.last_enabled,

772

variant_level=1))

773

return r

774

775

def disable(self, quiet = False):

776

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

777

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

778

if not quiet and oldstate != self.enabled:

779

# Emit D-Bus signal

780

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

781

dbus.Boolean(False, variant_level=1))

782

return r

1086

783

1087

784

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

1088

785

try:

1097

794

*args, **kwargs):

1098

795

self.checker_callback_tag = None

1099

796

self.checker = None

797

# Emit D-Bus signal

798

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

799

dbus.Boolean(False, variant_level=1))

1100

800

if os.WIFEXITED(condition):

1101

801

exitstatus = os.WEXITSTATUS(condition)

1102

802

# Emit D-Bus signal

1112

812

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

1113

813

*args, **kwargs)

1114

814

815

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

816

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

817

# Emit D-Bus signal

818

self.PropertyChanged(

819

dbus.String("LastCheckedOK"),

820

(self._datetime_to_dbus(self.last_checked_ok,

821

variant_level=1)))

822

return r

823

824

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

825

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

826

# Emit D-Bus signal

827

self.PropertyChanged(

828

dbus.String("LastApprovalRequest"),

829

(self._datetime_to_dbus(self.last_approval_request,

830

variant_level=1)))

831

return r

832

1115

833

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

1116

834

old_checker = self.checker

1117

835

if self.checker is not None:

1124

842

and old_checker_pid != self.checker.pid):

1125

843

# Emit D-Bus signal

1126

844

self.CheckerStarted(self.current_checker_command)

845

self.PropertyChanged(

846

dbus.String("CheckerRunning"),

847

dbus.Boolean(True, variant_level=1))

1127

848

return r

1128

849

850

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

851

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

852

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

853

if (old_checker is not None

854

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

855

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

856

dbus.Boolean(False, variant_level=1))

857

return r

858

1129

859

def _reset_approved(self):

1130

860

self._approved = None

1131

861

return False

1133

863

def approve(self, value=True):

1134

864

self.send_changedstate()

1135

865

self._approved = value

1136

gobject.timeout_add(_timedelta_to_milliseconds

866

gobject.timeout_add(self._timedelta_to_milliseconds

1137

867

(self.approval_duration),

1138

868

self._reset_approved)

1139

869

1140

870

1141

871

## D-Bus methods, signals & properties

1142

_interface = "se.recompile.Mandos.Client"

872

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

1143

873

1144

874

## Signals

1145

875

1182

912

"D-Bus signal"

1183

913

return self.need_approval()

1184

914

1185

# NeRwequest - signal

1186

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

1187

def NewRequest(self, ip):

1188

"""D-Bus signal

1189

Is sent after a client request a password.

1190

"""

1191

pass

1192

1193

915

## Methods

1194

916

1195

917

# Approve - method

1200

922

# CheckedOK - method

1201

923

@dbus.service.method(_interface)

1202

924

def CheckedOK(self):

1203

self.checked_ok()

925

return self.checked_ok()

1204

926

1205

927

# Enable - method

1206

928

@dbus.service.method(_interface)

1239

961

if value is None: # get

1240

962

return dbus.Boolean(self.approved_by_default)

1241

963

self.approved_by_default = bool(value)

964

# Emit D-Bus signal

965

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

966

dbus.Boolean(value, variant_level=1))

1242

967

1243

968

# ApprovalDelay - property

1244

969

@dbus_service_property(_interface, signature="t",

1247

972

if value is None: # get

1248

973

return dbus.UInt64(self.approval_delay_milliseconds())

1249

974

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

975

# Emit D-Bus signal

976

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

977

dbus.UInt64(value, variant_level=1))

1250

978

1251

979

# ApprovalDuration - property

1252

980

@dbus_service_property(_interface, signature="t",

1253

981

access="readwrite")

1254

982

def ApprovalDuration_dbus_property(self, value=None):

1255

983

if value is None: # get

1256

return dbus.UInt64(_timedelta_to_milliseconds(

984

return dbus.UInt64(self._timedelta_to_milliseconds(

1257

985

self.approval_duration))

1258

986

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

987

# Emit D-Bus signal

988

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

989

dbus.UInt64(value, variant_level=1))

1259

990

1260

991

# Name - property

1261

992

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

1274

1005

if value is None: # get

1275

1006

return dbus.String(self.host)

1276

1007

self.host = value

1008

# Emit D-Bus signal

1009

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

1010

dbus.String(value, variant_level=1))

1277

1011

1278

1012

# Created - property

1279

1013

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

1280

1014

def Created_dbus_property(self):

1281

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

1015

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

1282

1016

1283

1017

# LastEnabled - property

1284

1018

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

1285

1019

def LastEnabled_dbus_property(self):

1286

return datetime_to_dbus(self.last_enabled)

1020

if self.last_enabled is None:

1021

return dbus.String("")

1022

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

1287

1023

1288

1024

# Enabled - property

1289

1025

@dbus_service_property(_interface, signature="b",

1303

1039

if value is not None:

1304

1040

self.checked_ok()

1305

1041

return

1306

return datetime_to_dbus(self.last_checked_ok)

1307

1308

# Expires - property

1309

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

1310

def Expires_dbus_property(self):

1311

return datetime_to_dbus(self.expires)

1042

if self.last_checked_ok is None:

1043

return dbus.String("")

1044

return dbus.String(self._datetime_to_dbus(self

1045

.last_checked_ok))

1312

1046

1313

1047

# LastApprovalRequest - property

1314

1048

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

1315

1049

def LastApprovalRequest_dbus_property(self):

1316

return datetime_to_dbus(self.last_approval_request)

1050

if self.last_approval_request is None:

1051

return dbus.String("")

1052

return dbus.String(self.

1053

_datetime_to_dbus(self

1054

.last_approval_request))

1317

1055

1318

1056

# Timeout - property

1319

1057

@dbus_service_property(_interface, signature="t",

1322

1060

if value is None: # get

1323

1061

return dbus.UInt64(self.timeout_milliseconds())

1324

1062

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

1063

# Emit D-Bus signal

1064

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

1065

dbus.UInt64(value, variant_level=1))

1325

1066

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

1326

1067

return

1327

1068

# Reschedule timeout

1328

1069

gobject.source_remove(self.disable_initiator_tag)

1329

1070

self.disable_initiator_tag = None

1330

self.expires = None

1331

time_to_die = _timedelta_to_milliseconds((self

1332

.last_checked_ok

1333

+ self.timeout)

1334

- datetime.datetime

1335

.utcnow())

1071

time_to_die = (self.

1072

_timedelta_to_milliseconds((self

1073

.last_checked_ok

1074

+ self.timeout)

1075

- datetime.datetime

1076

.utcnow()))

1336

1077

if time_to_die <= 0:

1337

1078

# The timeout has passed

1338

1079

self.disable()

1339

1080

else:

1340

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

1341

+ datetime.timedelta(milliseconds =

1342

time_to_die))

1343

1081

self.disable_initiator_tag = (gobject.timeout_add

1344

1082

(time_to_die, self.disable))

1345

1083

1346

# ExtendedTimeout - property

1347

@dbus_service_property(_interface, signature="t",

1348

access="readwrite")

1349

def ExtendedTimeout_dbus_property(self, value=None):

1350

if value is None: # get

1351

return dbus.UInt64(self.extended_timeout_milliseconds())

1352

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

1353

1354

1084

# Interval - property

1355

1085

@dbus_service_property(_interface, signature="t",

1356

1086

access="readwrite")

1358

1088

if value is None: # get

1359

1089

return dbus.UInt64(self.interval_milliseconds())

1360

1090

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

1091

# Emit D-Bus signal

1092

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

1093

dbus.UInt64(value, variant_level=1))

1361

1094

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

1362

1095

return

1363

1096

# Reschedule checker run

1365

1098

self.checker_initiator_tag = (gobject.timeout_add

1366

1099

(value, self.start_checker))

1367

1100

self.start_checker() # Start one now, too

1368

1101

1369

1102

# Checker - property

1370

1103

@dbus_service_property(_interface, signature="s",

1371

1104

access="readwrite")

1373

1106

if value is None: # get

1374

1107

return dbus.String(self.checker_command)

1375

1108

self.checker_command = value

1109

# Emit D-Bus signal

1110

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

1111

dbus.String(self.checker_command,

1112

variant_level=1))

1376

1113

1377

1114

# CheckerRunning - property

1378

1115

@dbus_service_property(_interface, signature="b",

1405

1142

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

1406

1143

if not self._pipe.recv():

1407

1144

raise KeyError()

1408

1145

1409

1146

def __getattribute__(self, name):

1410

1147

if(name == '_pipe'):

1411

1148

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

1418

1155

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

1419

1156

return self._pipe.recv()[1]

1420

1157

return func

1421

1158

1422

1159

def __setattr__(self, name, value):

1423

1160

if(name == '_pipe'):

1424

1161

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

1425

1162

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

1426

1163

1427

1164

1428

class ClientDBusTransitional(ClientDBus):

1429

__metaclass__ = AlternateDBusNamesMetaclass

1430

1431

1432

1165

class ClientHandler(socketserver.BaseRequestHandler, object):

1433

1166

"""A class to handle client connections.

1434

1167

1441

1174

unicode(self.client_address))

1442

1175

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

1443

1176

self.server.child_pipe.fileno())

1444

1177

1445

1178

session = (gnutls.connection

1446

1179

.ClientSession(self.request,

1447

1180

gnutls.connection

1448

1181

.X509Credentials()))

1449

1182

1450

1183

# Note: gnutls.connection.X509Credentials is really a

1451

1184

# generic GnuTLS certificate credentials object so long as

1452

1185

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

1453

1186

# here despite using OpenPGP certificates.

1454

1187

1455

1188

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

1456

1189

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

1457

1190

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

1463

1196

(gnutls.library.functions

1464

1197

.gnutls_priority_set_direct(session._c_object,

1465

1198

priority, None))

1466

1199

1467

1200

# Start communication using the Mandos protocol

1468

1201

# Get protocol number

1469

1202

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

1471

1204

try:

1472

1205

if int(line.strip().split()[0]) > 1:

1473

1206

raise RuntimeError

1474

except (ValueError, IndexError, RuntimeError) as error:

1207

except (ValueError, IndexError, RuntimeError), error:

1475

1208

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

1476

1209

return

1477

1210

1478

1211

# Start GnuTLS connection

1479

1212

try:

1480

1213

session.handshake()

1481

except gnutls.errors.GNUTLSError as error:

1214

except gnutls.errors.GNUTLSError, error:

1482

1215

logger.warning("Handshake failed: %s", error)

1483

1216

# Do not run session.bye() here: the session is not

1484

1217

# established. Just abandon the request.

1485

1218

return

1486

1219

logger.debug("Handshake succeeded")

1487

1220

1488

1221

approval_required = False

1489

1222

try:

1490

1223

try:

1491

1224

fpr = self.fingerprint(self.peer_certificate

1492

1225

(session))

1493

except (TypeError,

1494

gnutls.errors.GNUTLSError) as error:

1226

except (TypeError, gnutls.errors.GNUTLSError), error:

1495

1227

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

1496

1228

return

1497

1229

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

1498

if self.server.use_dbus:

1499

# Emit D-Bus signal

1500

client.NewRequest(str(self.client_address))

1501

1230

1502

1231

try:

1503

1232

client = ProxyClient(child_pipe, fpr,

1504

1233

self.client_address)

1512

1241

1513

1242

while True:

1514

1243

if not client.enabled:

1515

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

1244

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

1516

1245

client.name)

1517

1246

if self.server.use_dbus:

1518

1247

# Emit D-Bus signal

1519

client.Rejected("Disabled")

1248

client.Rejected("Disabled")

1520

1249

return

1521

1250

1522

1251

if client._approved or not client.approval_delay:

1539

1268

return

1540

1269

1541

1270

#wait until timeout or approved

1271

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

1542

1272

time = datetime.datetime.now()

1543

1273

client.changedstate.acquire()

1544

(client.changedstate.wait

1545

(float(client._timedelta_to_milliseconds(delay)

1546

/ 1000)))

1274

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

1547

1275

client.changedstate.release()

1548

1276

time2 = datetime.datetime.now()

1549

1277

if (time2 - time) >= delay:

1564

1292

while sent_size < len(client.secret):

1565

1293

try:

1566

1294

sent = session.send(client.secret[sent_size:])

1567

except gnutls.errors.GNUTLSError as error:

1295

except (gnutls.errors.GNUTLSError), error:

1568

1296

logger.warning("gnutls send failed")

1569

1297

return

1570

1298

logger.debug("Sent: %d, remaining: %d",

1571

1299

sent, len(client.secret)

1572

1300

- (sent_size + sent))

1573

1301

sent_size += sent

1574

1302

1575

1303

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

1576

# bump the timeout using extended_timeout

1577

client.checked_ok(client.extended_timeout)

1304

# bump the timeout as if seen

1305

client.checked_ok()

1578

1306

if self.server.use_dbus:

1579

1307

# Emit D-Bus signal

1580

1308

client.GotSecret()

1584

1312

client.approvals_pending -= 1

1585

1313

try:

1586

1314

session.bye()

1587

except gnutls.errors.GNUTLSError as error:

1315

except (gnutls.errors.GNUTLSError), error:

1588

1316

logger.warning("GnuTLS bye failed")

1589

1317

1590

1318

@staticmethod

1647

1375

# Convert the buffer to a Python bytestring

1648

1376

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

1649

1377

# Convert the bytestring to hexadecimal notation

1650

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

1378

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

1651

1379

return hex_fpr

1652

1380

1653

1381

1659

1387

except:

1660

1388

self.handle_error(request, address)

1661

1389

self.close_request(request)

1662

1390

1663

1391

def process_request(self, request, address):

1664

1392

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

1665

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

1666

args = (request,

1667

address))

1668

proc.start()

1669

return proc

1670

1393

multiprocessing.Process(target = self.sub_process_main,

1394

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

1671

1395

1672

1396

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1673

1397

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

1677

1401

This function creates a new pipe in self.pipe

1678

1402

"""

1679

1403

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1680

1681

proc = MultiprocessingMixIn.process_request(self, request,

1682

client_address)

1404

1405

super(MultiprocessingMixInWithPipe,

1406

self).process_request(request, client_address)

1683

1407

self.child_pipe.close()

1684

self.add_pipe(parent_pipe, proc)

1685

1686

def add_pipe(self, parent_pipe, proc):

1408

self.add_pipe(parent_pipe)

1409

1410

def add_pipe(self, parent_pipe):

1687

1411

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

1688

1412

raise NotImplementedError

1689

1413

1690

1691

1414

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1692

1415

socketserver.TCPServer, object):

1693

1416

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

1719

1442

SO_BINDTODEVICE,

1720

1443

str(self.interface

1721

1444

+ '\0'))

1722

except socket.error as error:

1445

except socket.error, error:

1723

1446

if error[0] == errno.EPERM:

1724

1447

logger.error("No permission to"

1725

1448

" bind to interface %s",

1767

1490

self.enabled = False

1768

1491

self.clients = clients

1769

1492

if self.clients is None:

1770

self.clients = {}

1493

self.clients = set()

1771

1494

self.use_dbus = use_dbus

1772

1495

self.gnutls_priority = gnutls_priority

1773

1496

IPv6_TCPServer.__init__(self, server_address,

1777

1500

def server_activate(self):

1778

1501

if self.enabled:

1779

1502

return socketserver.TCPServer.server_activate(self)

1780

1781

1503

def enable(self):

1782

1504

self.enabled = True

1783

1784

def add_pipe(self, parent_pipe, proc):

1505

def add_pipe(self, parent_pipe):

1785

1506

# Call "handle_ipc" for both data and EOF events

1786

1507

gobject.io_add_watch(parent_pipe.fileno(),

1787

1508

gobject.IO_IN | gobject.IO_HUP,

1788

1509

functools.partial(self.handle_ipc,

1789

parent_pipe =

1790

parent_pipe,

1791

proc = proc))

1792

1510

parent_pipe = parent_pipe))

1511

1793

1512

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

1794

proc = None, client_object=None):

1513

client_object=None):

1795

1514

condition_names = {

1796

1515

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

1797

1516

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

1806

1525

for cond, name in

1807

1526

condition_names.iteritems()

1808

1527

if cond & condition)

1809

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

1528

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

1810

1529

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

1811

# Wait for other process to exit

1812

proc.join()

1813

1530

return False

1814

1531

1815

1532

# Read a request from the child

1820

1537

fpr = request[1]

1821

1538

address = request[2]

1822

1539

1823

for c in self.clients.itervalues():

1540

for c in self.clients:

1824

1541

if c.fingerprint == fpr:

1825

1542

client = c

1826

1543

break

1827

1544

else:

1828

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

1829

"dress: %s", fpr, address)

1545

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

1546

"dress: %s", fpr, address)

1830

1547

if self.use_dbus:

1831

1548

# Emit D-Bus signal

1832

mandos_dbus_service.ClientNotFound(fpr,

1833

address[0])

1549

mandos_dbus_service.ClientNotFound(fpr, address[0])

1834

1550

parent_pipe.send(False)

1835

1551

return False

1836

1552

1837

1553

gobject.io_add_watch(parent_pipe.fileno(),

1838

1554

gobject.IO_IN | gobject.IO_HUP,

1839

1555

functools.partial(self.handle_ipc,

1840

parent_pipe =

1841

parent_pipe,

1842

proc = proc,

1843

client_object =

1844

client))

1556

parent_pipe = parent_pipe,

1557

client_object = client))

1845

1558

parent_pipe.send(True)

1846

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

1847

# same fileno

1559

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

1848

1560

return False

1849

1561

if command == 'funcall':

1850

1562

funcname = request[1]

1851

1563

args = request[2]

1852

1564

kwargs = request[3]

1853

1565

1854

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

1855

funcname)(*args,

1856

**kwargs)))

1857

1566

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

1567

1858

1568

if command == 'getattr':

1859

1569

attrname = request[1]

1860

1570

if callable(client_object.__getattribute__(attrname)):

1861

1571

parent_pipe.send(('function',))

1862

1572

else:

1863

parent_pipe.send(('data', client_object

1864

.__getattribute__(attrname)))

1573

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

1865

1574

1866

1575

if command == 'setattr':

1867

1576

attrname = request[1]

1868

1577

value = request[2]

1869

1578

setattr(client_object, attrname, value)

1870

1579

1871

1580

return True

1872

1581

1873

1582

1904

1613

delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)

1905

1614

else:

1906

1615

raise ValueError("Unknown suffix %r" % suffix)

1907

except (ValueError, IndexError) as e:

1616

except (ValueError, IndexError), e:

1908

1617

raise ValueError(*(e.args))

1909

1618

timevalue += delta

1910

1619

return timevalue

1911

1620

1912

1621

1622

def if_nametoindex(interface):

1623

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

1624

1625

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

1626

global if_nametoindex

1627

try:

1628

if_nametoindex = (ctypes.cdll.LoadLibrary

1629

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

1630

.if_nametoindex)

1631

except (OSError, AttributeError):

1632

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

1633

def if_nametoindex(interface):

1634

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

1635

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

1636

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

1637

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1638

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

1639

interface))

1640

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

1641

ifreq[16:20])[0]

1642

return interface_index

1643

return if_nametoindex(interface)

1644

1645

1913

1646

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

1914

1647

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

1915

1648

1940

1673

##################################################################

1941

1674

# Parsing of options, both command line and config file

1942

1675

1943

parser = argparse.ArgumentParser()

1944

parser.add_argument("-v", "--version", action="version",

1945

version = "%%(prog)s %s" % version,

1946

help="show version number and exit")

1947

parser.add_argument("-i", "--interface", metavar="IF",

1948

help="Bind to interface IF")

1949

parser.add_argument("-a", "--address",

1950

help="Address to listen for requests on")

1951

parser.add_argument("-p", "--port", type=int,

1952

help="Port number to receive requests on")

1953

parser.add_argument("--check", action="store_true",

1954

help="Run self-test")

1955

parser.add_argument("--debug", action="store_true",

1956

help="Debug mode; run in foreground and log"

1957

" to terminal")

1958

parser.add_argument("--debuglevel", metavar="LEVEL",

1959

help="Debug level for stdout output")

1960

parser.add_argument("--priority", help="GnuTLS"

1961

" priority string (see GnuTLS documentation)")

1962

parser.add_argument("--servicename",

1963

metavar="NAME", help="Zeroconf service name")

1964

parser.add_argument("--configdir",

1965

default="/etc/mandos", metavar="DIR",

1966

help="Directory to search for configuration"

1967

" files")

1968

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

1969

dest="use_dbus", help="Do not provide D-Bus"

1970

" system bus interface")

1971

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

1972

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

1973

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

1974

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

1975

" state")

1976

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

1977

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

1978

1979

options = parser.parse_args()

1676

parser = optparse.OptionParser(version = "%%prog %s" % version)

1677

parser.add_option("-i", "--interface", type="string",

1678

metavar="IF", help="Bind to interface IF")

1679

parser.add_option("-a", "--address", type="string",

1680

help="Address to listen for requests on")

1681

parser.add_option("-p", "--port", type="int",

1682

help="Port number to receive requests on")

1683

parser.add_option("--check", action="store_true",

1684

help="Run self-test")

1685

parser.add_option("--debug", action="store_true",

1686

help="Debug mode; run in foreground and log to"

1687

" terminal")

1688

parser.add_option("--debuglevel", type="string", metavar="LEVEL",

1689

help="Debug level for stdout output")

1690

parser.add_option("--priority", type="string", help="GnuTLS"

1691

" priority string (see GnuTLS documentation)")

1692

parser.add_option("--servicename", type="string",

1693

metavar="NAME", help="Zeroconf service name")

1694

parser.add_option("--configdir", type="string",

1695

default="/etc/mandos", metavar="DIR",

1696

help="Directory to search for configuration"

1697

" files")

1698

parser.add_option("--no-dbus", action="store_false",

1699

dest="use_dbus", help="Do not provide D-Bus"

1700

" system bus interface")

1701

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

1702

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

1703

options = parser.parse_args()[0]

1980

1704

1981

1705

if options.check:

1982

1706

import doctest

1994

1718

"use_dbus": "True",

1995

1719

"use_ipv6": "True",

1996

1720

"debuglevel": "",

1997

"restore": "True",

1998

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

1999

1721

}

2000

1722

2001

1723

# Parse config file for server-global settings

2018

1740

# options, if set.

2019

1741

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

2020

1742

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

2021

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

2022

"statedir"):

1743

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

2023

1744

value = getattr(options, option)

2024

1745

if value is not None:

2025

1746

server_settings[option] = value

2037

1758

debuglevel = server_settings["debuglevel"]

2038

1759

use_dbus = server_settings["use_dbus"]

2039

1760

use_ipv6 = server_settings["use_ipv6"]

2040

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

2041

stored_state_file)

2042

2043

if debug:

2044

initlogger(logging.DEBUG)

2045

else:

2046

if not debuglevel:

2047

initlogger()

2048

else:

2049

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

2050

initlogger(level)

2051

1761

2052

1762

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

2053

1763

syslogger.setFormatter(logging.Formatter

2054

1764

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

2056

1766

% server_settings["servicename"]))

2057

1767

2058

1768

# Parse config file with clients

2059

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

2060

"extended_timeout": "15m",

2061

"interval": "2m",

1769

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

1770

"interval": "5m",

2062

1771

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

2063

1772

"host": "",

2064

1773

"approval_delay": "0s",

2104

1813

try:

2105

1814

os.setgid(gid)

2106

1815

os.setuid(uid)

2107

except OSError as error:

1816

except OSError, error:

2108

1817

if error[0] != errno.EPERM:

2109

1818

raise error

2110

1819

1820

if not debug and not debuglevel:

1821

syslogger.setLevel(logging.WARNING)

1822

console.setLevel(logging.WARNING)

1823

if debuglevel:

1824

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

1825

syslogger.setLevel(level)

1826

console.setLevel(level)

1827

2111

1828

if debug:

2112

1829

# Enable all possible GnuTLS debugging

2113

1830

2144

1861

# End of Avahi example code

2145

1862

if use_dbus:

2146

1863

try:

2147

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

1864

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

2148

1865

bus, do_not_queue=True)

2149

old_bus_name = (dbus.service.BusName

2150

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

2151

do_not_queue=True))

2152

except dbus.exceptions.NameExistsException as e:

1866

except dbus.exceptions.NameExistsException, e:

2153

1867

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

2154

1868

use_dbus = False

2155

1869

server_settings["use_dbus"] = False

2156

1870

tcp_server.use_dbus = False

2157

1871

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2158

service = AvahiServiceToSyslog(name =

2159

server_settings["servicename"],

2160

servicetype = "_mandos._tcp",

2161

protocol = protocol, bus = bus)

1872

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

1873

servicetype = "_mandos._tcp",

1874

protocol = protocol, bus = bus)

2162

1875

if server_settings["interface"]:

2163

1876

service.interface = (if_nametoindex

2164

1877

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

2168

1881

2169

1882

client_class = Client

2170

1883

if use_dbus:

2171

client_class = functools.partial(ClientDBusTransitional,

2172

bus = bus)

2173

2174

special_settings = {

2175

# Some settings need to be accessd by special methods;

2176

# booleans need .getboolean(), etc. Here is a list of them:

2177

"approved_by_default":

2178

lambda section:

2179

client_config.getboolean(section, "approved_by_default"),

2180

}

2181

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

2182

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

2183

# with exceptions for any special settings as defined above

2184

client_settings = dict((clientname,

2185

dict((setting,

2186

(value

2187

if setting not in special_settings

2188

else special_settings[setting]

2189

(clientname)))

2190

for setting, value in

2191

client_config.items(clientname)))

2192

for clientname in client_config.sections())

2193

2194

old_client_settings = {}

2195

clients_data = []

2196

2197

# Get client data and settings from last running state.

2198

if server_settings["restore"]:

2199

try:

2200

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

2201

clients_data, old_client_settings = (pickle.load

2202

(stored_state))

2203

os.remove(stored_state_path)

2204

except IOError as e:

2205

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

2206

.format(e))

2207

if e.errno != errno.ENOENT:

2208

raise

2209

2210

with Crypto() as crypt:

2211

for client in clients_data:

2212

client_name = client["name"]

2213

2214

# Decide which value to use after restoring saved state.

2215

# We have three different values: Old config file,

2216

# new config file, and saved state.

2217

# New config value takes precedence if it differs from old

2218

# config value, otherwise use saved state.

2219

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

2220

try:

2221

# For each value in new config, check if it

2222

# differs from the old config value (Except for

2223

# the "secret" attribute)

2224

if (name != "secret" and

2225

value != old_client_settings[client_name]

2226

[name]):

2227

setattr(client, name, value)

2228

except KeyError:

2229

pass

2230

2231

# Clients who has passed its expire date can still be

2232

# enabled if its last checker was sucessful. Clients

2233

# whose checker failed before we stored its state is

2234

# assumed to have failed all checkers during downtime.

2235

if client["enabled"] and client["last_checked_ok"]:

2236

if ((datetime.datetime.utcnow()

2237

- client["last_checked_ok"])

2238

> client["interval"]):

2239

if client["last_checker_status"] != 0:

2240

client["enabled"] = False

2241

else:

2242

client["expires"] = (datetime.datetime

2243

.utcnow()

2244

+ client["timeout"])

2245

2246

client["changedstate"] = (multiprocessing_manager

2247

.Condition

2248

(multiprocessing_manager

2249

.Lock()))

2250

if use_dbus:

2251

new_client = (ClientDBusTransitional.__new__

2252

(ClientDBusTransitional))

2253

tcp_server.clients[client_name] = new_client

2254

new_client.bus = bus

2255

for name, value in client.iteritems():

2256

setattr(new_client, name, value)

2257

client_object_name = unicode(client_name).translate(

2258

{ord("."): ord("_"),

2259

ord("-"): ord("_")})

2260

new_client.dbus_object_path = (dbus.ObjectPath

2261

("/clients/"

2262

+ client_object_name))

2263

DBusObjectWithProperties.__init__(new_client,

2264

new_client.bus,

2265

new_client

2266

.dbus_object_path)

2267

else:

2268

tcp_server.clients[client_name] = (Client.__new__

2269

(Client))

2270

for name, value in client.iteritems():

2271

setattr(tcp_server.clients[client_name],

2272

name, value)

2273

1884

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

1885

def client_config_items(config, section):

1886

special_settings = {

1887

"approved_by_default":

1888

lambda: config.getboolean(section,

1889

"approved_by_default"),

1890

}

1891

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

2274

1892

try:

2275

tcp_server.clients[client_name].secret = (

2276

crypt.decrypt(tcp_server.clients[client_name]

2277

.encrypted_secret,

2278

client_settings[client_name]

2279

["secret"]))

2280

except CryptoError:

2281

# If decryption fails, we use secret from new settings

2282

tcp_server.clients[client_name].secret = (

2283

client_settings[client_name]["secret"])

2284

2285

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

2286

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

2287

del tcp_server.clients[clientname]

2288

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

2289

tcp_server.clients[clientname] = (client_class(name

2290

= clientname,

2291

config =

2292

client_settings

2293

[clientname]))

2294

1893

yield (name, special_settings[name]())

1894

except KeyError:

1895

yield (name, value)

1896

1897

tcp_server.clients.update(set(

1898

client_class(name = section,

1899

config= dict(client_config_items(

1900

client_config, section)))

1901

for section in client_config.sections()))

2295

1902

if not tcp_server.clients:

2296

1903

logger.warning("No clients defined")

2297

1904

2310

1917

del pidfilename

2311

1918

2312

1919

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

2313

1920

2314

1921

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

2315

1922

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

2316

1923

2319

1926

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

2320

1927

def __init__(self):

2321

1928

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

2322

_interface = "se.recompile.Mandos"

1929

_interface = "se.bsnet.fukt.Mandos"

2323

1930

2324

1931

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

2325

1932

def ClientAdded(self, objpath):

2340

1947

def GetAllClients(self):

2341

1948

"D-Bus method"

2342

1949

return dbus.Array(c.dbus_object_path

2343

for c in

2344

tcp_server.clients.itervalues())

1950

for c in tcp_server.clients)

2345

1951

2346

1952

@dbus.service.method(_interface,

2347

1953

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

2349

1955

"D-Bus method"

2350

1956

return dbus.Dictionary(

2351

1957

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

2352

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

1958

for c in tcp_server.clients),

2353

1959

signature="oa{sv}")

2354

1960

2355

1961

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

2356

1962

def RemoveClient(self, object_path):

2357

1963

"D-Bus method"

2358

for c in tcp_server.clients.itervalues():

1964

for c in tcp_server.clients:

2359

1965

if c.dbus_object_path == object_path:

2360

del tcp_server.clients[c.name]

1966

tcp_server.clients.remove(c)

2361

1967

c.remove_from_connection()

2362

1968

# Don't signal anything except ClientRemoved

2363

1969

c.disable(quiet=True)

2368

1974

2369

1975

del _interface

2370

1976

2371

class MandosDBusServiceTransitional(MandosDBusService):

2372

__metaclass__ = AlternateDBusNamesMetaclass

2373

mandos_dbus_service = MandosDBusServiceTransitional()

1977

mandos_dbus_service = MandosDBusService()

2374

1978

2375

1979

def cleanup():

2376

1980

"Cleanup function; run on exit"

2377

1981

service.cleanup()

2378

1982

2379

multiprocessing.active_children()

2380

if not (tcp_server.clients or client_settings):

2381

return

2382

2383

# Store client before exiting. Secrets are encrypted with key

2384

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

2385

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

2386

clients = []

2387

with Crypto() as crypt:

2388

for client in tcp_server.clients.itervalues():

2389

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

2390

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

2391

key)

2392

client_dict = {}

2393

2394

# A list of attributes that will not be stored when

2395

# shutting down.

2396

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

2397

for name, typ in (inspect.getmembers

2398

(dbus.service.Object)):

2399

exclude.add(name)

2400

2401

client_dict["encrypted_secret"] = (client

2402

.encrypted_secret)

2403

for attr in client.client_structure:

2404

if attr not in exclude:

2405

client_dict[attr] = getattr(client, attr)

2406

2407

clients.append(client_dict)

2408

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

2409

2410

try:

2411

with os.fdopen(os.open(stored_state_path,

2412

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

2413

0600), "wb") as stored_state:

2414

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

2415

except (IOError, OSError) as e:

2416

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

2417

.format(e))

2418

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

2419

raise

2420

2421

# Delete all clients, and settings from config

2422

1983

while tcp_server.clients:

2423

name, client = tcp_server.clients.popitem()

1984

client = tcp_server.clients.pop()

2424

1985

if use_dbus:

2425

1986

client.remove_from_connection()

1987

client.disable_hook = None

2426

1988

# Don't signal anything except ClientRemoved

2427

1989

client.disable(quiet=True)

2428

1990

if use_dbus:

2429

1991

# Emit D-Bus signal

2430

mandos_dbus_service.ClientRemoved(client

2431

.dbus_object_path,

1992

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2432

1993

client.name)

2433

client_settings.clear()

2434

1994

2435

1995

atexit.register(cleanup)

2436

1996

2437

for client in tcp_server.clients.itervalues():

1997

for client in tcp_server.clients:

2438

1998

if use_dbus:

2439

1999

# Emit D-Bus signal

2440

2000

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2441

# Need to initiate checking of clients

2442

if client.enabled:

2443

client.init_checker()

2001

client.enable()

2444

2002

2445

2003

tcp_server.enable()

2446

2004

tcp_server.server_activate()

2461

2019

# From the Avahi example code

2462

2020

try:

2463

2021

service.activate()

2464

except dbus.exceptions.DBusException as error:

2022

except dbus.exceptions.DBusException, error:

2465

2023

logger.critical("DBusException: %s", error)

2466

2024

cleanup()

2467

2025

sys.exit(1)

2474

2032

2475

2033

logger.debug("Starting main loop")

2476

2034

main_loop.run()

2477

except AvahiError as error:

2035

except AvahiError, error:

2478

2036

logger.critical("AvahiError: %s", error)

2479

2037

cleanup()

2480

2038

sys.exit(1)

2486

2044

# Must run before the D-Bus bus name gets deregistered

2487

2045

cleanup()

2488

2046

2489

2490

2047

if __name__ == '__main__':

2491

2048

main()