/mandos/trunk : revision 472

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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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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.

426

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

427

disabled, or None

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"""

429

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runtime_expansions = ("approval_delay", "approval_duration",

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

433

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

434

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281

@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))

287

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

443

292

def interval_milliseconds(self):

444

293

"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

296

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

322

% self.name)

474

323

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

475

324

self.created = datetime.datetime.utcnow()

476

self.enabled = config.get("enabled", True)

325

self.enabled = False

477

326

self.last_approval_request = None

478

if self.enabled:

479

self.last_enabled = datetime.datetime.utcnow()

480

else:

481

self.last_enabled = None

327

self.last_enabled = None

482

328

self.last_checked_ok = None

483

self.last_checker_status = None

484

329

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

485

self.extended_timeout = string_to_delta(config

486

["extended_timeout"])

487

330

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

331

self.disable_hook = disable_hook

488

332

self.checker = None

489

333

self.checker_initiator_tag = None

490

334

self.disable_initiator_tag = None

491

if self.enabled:

492

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

493

else:

494

self.expires = None

495

335

self.checker_callback_tag = None

496

336

self.checker_command = config["checker"]

497

337

self.current_checker_command = None

498

self.approved = None

338

self.last_connect = None

339

self._approved = None

499

340

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

500

341

True)

501

342

self.approvals_pending = 0

503

344

config["approval_delay"])

504

345

self.approval_duration = string_to_delta(

505

346

config["approval_duration"])

506

self.changedstate = (multiprocessing_manager

507

.Condition(multiprocessing_manager

508

.Lock()))

509

self.client_structure = [attr for attr in

510

self.__dict__.iterkeys()

511

if not attr.startswith("_")]

512

self.client_structure.append("client_structure")

513

514

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

515

lambda obj:

516

isinstance(obj,

517

property)):

518

if not name.startswith("_"):

519

self.client_structure.append(name)

347

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

520

348

521

# Send notice to process children that client state has changed

522

349

def send_changedstate(self):

523

with self.changedstate:

524

self.changedstate.notify_all()

525

350

self.changedstate.acquire()

351

self.changedstate.notify_all()

352

self.changedstate.release()

353

526

354

def enable(self):

527

355

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

528

356

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

529

357

# Already enabled

530

358

return

531

359

self.send_changedstate()

532

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

533

self.enabled = True

534

360

self.last_enabled = datetime.datetime.utcnow()

535

self.init_checker()

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))

370

self.enabled = True

371

# Also start a new checker *right now*.

372

self.start_checker()

536

373

537

374

def disable(self, quiet=True):

538

375

"""Disable this client."""

545

382

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

546

383

gobject.source_remove(self.disable_initiator_tag)

547

384

self.disable_initiator_tag = None

548

self.expires = None

549

385

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

550

386

gobject.source_remove(self.checker_initiator_tag)

551

387

self.checker_initiator_tag = None

552

388

self.stop_checker()

389

if self.disable_hook:

390

self.disable_hook(self)

553

391

self.enabled = False

554

392

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

555

393

return False

556

394

557

395

def __del__(self):

396

self.disable_hook = None

558

397

self.disable()

559

398

560

def init_checker(self):

561

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

562

# and every interval from then on.

563

self.checker_initiator_tag = (gobject.timeout_add

564

(self.interval_milliseconds(),

565

self.start_checker))

566

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

567

self.disable_initiator_tag = (gobject.timeout_add

568

(self.timeout_milliseconds(),

569

self.disable))

570

# Also start a new checker *right now*.

571

self.start_checker()

572

573

399

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

574

400

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

575

401

self.checker_callback_tag = None

576

402

self.checker = None

577

403

if os.WIFEXITED(condition):

578

self.last_checker_status = os.WEXITSTATUS(condition)

579

if self.last_checker_status == 0:

404

exitstatus = os.WEXITSTATUS(condition)

405

if exitstatus == 0:

580

406

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

581

407

vars(self))

582

408

self.checked_ok()

584

410

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

585

411

vars(self))

586

412

else:

587

self.last_checker_status = -1

588

413

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

589

414

vars(self))

590

415

591

def checked_ok(self, timeout=None):

416

def checked_ok(self):

592

417

"""Bump up the timeout for this client.

593

418

594

419

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

595

420

alive and well.

596

421

"""

597

if timeout is None:

598

timeout = self.timeout

599

422

self.last_checked_ok = datetime.datetime.utcnow()

600

if self.disable_initiator_tag is not None:

601

gobject.source_remove(self.disable_initiator_tag)

602

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

603

self.disable_initiator_tag = (gobject.timeout_add

604

(timedelta_to_milliseconds

605

(timeout), self.disable))

606

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))

607

427

608

428

def need_approval(self):

609

429

self.last_approval_request = datetime.datetime.utcnow()

625

445

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

626

446

try:

627

447

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

628

except (AttributeError, OSError) as error:

448

except (AttributeError, OSError), error:

629

449

if (isinstance(error, OSError)

630

450

and error.errno != errno.ECHILD):

631

451

raise error

649

469

'replace')))

650

470

for attr in

651

471

self.runtime_expansions)

652

472

653

473

try:

654

474

command = self.checker_command % escaped_attrs

655

except TypeError as error:

475

except TypeError, error:

656

476

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

657

477

' %s', self.checker_command, error)

658

478

return True # Try again later

677

497

if pid:

678

498

gobject.source_remove(self.checker_callback_tag)

679

499

self.checker_callback(pid, status, command)

680

except OSError as error:

500

except OSError, error:

681

501

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

682

502

error)

683

503

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

696

516

#time.sleep(0.5)

697

517

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

698

518

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

699

except OSError as error:

519

except OSError, error:

700

520

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

701

521

raise

702

522

self.checker = None

703

523

704

705

524

def dbus_service_property(dbus_interface, signature="v",

706

525

access="readwrite", byte_arrays=False):

707

526

"""Decorators for marking methods of a DBusObjectWithProperties to

753

572

754

573

class DBusObjectWithProperties(dbus.service.Object):

755

574

"""A D-Bus object with properties.

756

575

757

576

Classes inheriting from this can use the dbus_service_property

758

577

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

759

578

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

766

585

def _get_all_dbus_properties(self):

767

586

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

768

587

"""

769

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

770

for cls in self.__class__.__mro__

588

return ((prop._dbus_name, prop)

771

589

for name, prop in

772

inspect.getmembers(cls, self._is_dbus_property))

590

inspect.getmembers(self, self._is_dbus_property))

773

591

774

592

def _get_dbus_property(self, interface_name, property_name):

775

593

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

776

594

property with the specified name and interface.

777

595

"""

778

for cls in self.__class__.__mro__:

779

for name, value in (inspect.getmembers

780

(cls, self._is_dbus_property)):

781

if (value._dbus_name == property_name

782

and value._dbus_interface == interface_name):

783

return value.__get__(self)

784

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

785

606

# No such property

786

607

raise DBusPropertyNotFound(self.dbus_object_path + ":"

787

608

+ interface_name + "."

821

642

def GetAll(self, interface_name):

822

643

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

823

644

standard.

824

645

825

646

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

826

647

"""

827

properties = {}

648

all = {}

828

649

for name, prop in self._get_all_dbus_properties():

829

650

if (interface_name

830

651

and interface_name != prop._dbus_interface):

835

656

continue

836

657

value = prop()

837

658

if not hasattr(value, "variant_level"):

838

properties[name] = value

659

all[name] = value

839

660

continue

840

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

841

value.variant_level+1)

842

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")

843

664

844

665

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

845

666

out_signature="s",

883

704

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

884

705

document.unlink()

885

706

except (AttributeError, xml.dom.DOMException,

886

xml.parsers.expat.ExpatError) as error:

707

xml.parsers.expat.ExpatError), error:

887

708

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

888

709

error)

889

710

return xmlstring

890

711

891

712

892

def datetime_to_dbus (dt, variant_level=0):

893

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

894

if dt is None:

895

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

896

return dbus.String(dt.isoformat(),

897

variant_level=variant_level)

898

899

900

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

901

.__metaclass__):

902

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

903

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

904

"""

905

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

906

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

907

# methods, signals, or properties in them

908

for base in (b for b in bases

909

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

910

# Go though all attributes of the base class

911

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

912

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

913

# with the wrong interface name

914

if (not hasattr(attribute, "_dbus_interface")

915

or not attribute._dbus_interface

916

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

917

continue

918

# Create an alternate D-Bus interface name based on

919

# the current name

920

alt_interface = (attribute._dbus_interface

921

.replace("se.recompile.Mandos",

922

"se.bsnet.fukt.Mandos"))

923

# Is this a D-Bus signal?

924

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

925

# Extract the original non-method function by

926

# black magic

927

nonmethod_func = (dict(

928

zip(attribute.func_code.co_freevars,

929

attribute.__closure__))["func"]

930

.cell_contents)

931

# Create a new, but exactly alike, function

932

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

933

# with the alternate D-Bus interface name

934

new_function = (dbus.service.signal

935

(alt_interface,

936

attribute._dbus_signature)

937

(types.FunctionType(

938

nonmethod_func.func_code,

939

nonmethod_func.func_globals,

940

nonmethod_func.func_name,

941

nonmethod_func.func_defaults,

942

nonmethod_func.func_closure)))

943

# Define a creator of a function to call both the

944

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

945

# signals gets sent when the function is called

946

def fixscope(func1, func2):

947

"""This function is a scope container to pass

948

func1 and func2 to the "call_both" function

949

outside of its arguments"""

950

def call_both(*args, **kwargs):

951

"""This function will emit two D-Bus

952

signals by calling func1 and func2"""

953

func1(*args, **kwargs)

954

func2(*args, **kwargs)

955

return call_both

956

# Create the "call_both" function and add it to

957

# the class

958

attr[attrname] = fixscope(attribute,

959

new_function)

960

# Is this a D-Bus method?

961

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

962

# Create a new, but exactly alike, function

963

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

964

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

965

# to the class.

966

attr[attrname] = (dbus.service.method

967

(alt_interface,

968

attribute._dbus_in_signature,

969

attribute._dbus_out_signature)

970

(types.FunctionType

971

(attribute.func_code,

972

attribute.func_globals,

973

attribute.func_name,

974

attribute.func_defaults,

975

attribute.func_closure)))

976

# Is this a D-Bus property?

977

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

978

# Create a new, but exactly alike, function

979

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

980

# property with the alternate D-Bus interface

981

# name. Add it to the class.

982

attr[attrname] = (dbus_service_property

983

(alt_interface,

984

attribute._dbus_signature,

985

attribute._dbus_access,

986

attribute

987

._dbus_get_args_options

988

["byte_arrays"])

989

(types.FunctionType

990

(attribute.func_code,

991

attribute.func_globals,

992

attribute.func_name,

993

attribute.func_defaults,

994

attribute.func_closure)))

995

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

996

997

998

713

class ClientDBus(Client, DBusObjectWithProperties):

999

714

"""A Client class using D-Bus

1000

715

1009

724

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

1010

725

1011

726

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

727

self._approvals_pending = 0

1012

728

self.bus = bus

1013

729

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

1014

1015

self._approvals_pending = 0

1016

730

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

1017

731

# the D-Bus

1018

732

client_object_name = unicode(self.name).translate(

1023

737

DBusObjectWithProperties.__init__(self, self.bus,

1024

738

self.dbus_object_path)

1025

739

1026

def notifychangeproperty(transform_func,

1027

dbus_name, type_func=lambda x: x,

1028

variant_level=1):

1029

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

1030

its changes to DBus.

1031

1032

transform_fun: Function that takes a value and a variant_level

1033

and transforms it to a D-Bus type.

1034

dbus_name: D-Bus name of the variable

1035

type_func: Function that transform the value before sending it

1036

to the D-Bus. Default: no transform

1037

variant_level: D-Bus variant level. Default: 1

1038

"""

1039

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

1040

def setter(self, value):

1041

if hasattr(self, "dbus_object_path"):

1042

if (not hasattr(self, attrname) or

1043

type_func(getattr(self, attrname, None))

1044

!= type_func(value)):

1045

dbus_value = transform_func(type_func(value),

1046

variant_level

1047

=variant_level)

1048

self.PropertyChanged(dbus.String(dbus_name),

1049

dbus_value)

1050

setattr(self, attrname, value)

1051

1052

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

1053

1054

1055

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1056

approvals_pending = notifychangeproperty(dbus.Boolean,

1057

"ApprovalPending",

1058

type_func = bool)

1059

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

1060

last_enabled = notifychangeproperty(datetime_to_dbus,

1061

"LastEnabled")

1062

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

1063

type_func = lambda checker:

1064

checker is not None)

1065

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1066

"LastCheckedOK")

1067

last_approval_request = notifychangeproperty(

1068

datetime_to_dbus, "LastApprovalRequest")

1069

approved_by_default = notifychangeproperty(dbus.Boolean,

1070

"ApprovedByDefault")

1071

approval_delay = notifychangeproperty(dbus.UInt16,

1072

"ApprovalDelay",

1073

type_func =

1074

timedelta_to_milliseconds)

1075

approval_duration = notifychangeproperty(

1076

dbus.UInt16, "ApprovalDuration",

1077

type_func = timedelta_to_milliseconds)

1078

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

1079

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

1080

type_func =

1081

timedelta_to_milliseconds)

1082

extended_timeout = notifychangeproperty(

1083

dbus.UInt16, "ExtendedTimeout",

1084

type_func = timedelta_to_milliseconds)

1085

interval = notifychangeproperty(dbus.UInt16,

1086

"Interval",

1087

type_func =

1088

timedelta_to_milliseconds)

1089

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

1090

1091

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

1092

783

1093

784

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

1094

785

try:

1103

794

*args, **kwargs):

1104

795

self.checker_callback_tag = None

1105

796

self.checker = None

797

# Emit D-Bus signal

798

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

799

dbus.Boolean(False, variant_level=1))

1106

800

if os.WIFEXITED(condition):

1107

801

exitstatus = os.WEXITSTATUS(condition)

1108

802

# Emit D-Bus signal

1118

812

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

1119

813

*args, **kwargs)

1120

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

1121

833

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

1122

834

old_checker = self.checker

1123

835

if self.checker is not None:

1130

842

and old_checker_pid != self.checker.pid):

1131

843

# Emit D-Bus signal

1132

844

self.CheckerStarted(self.current_checker_command)

845

self.PropertyChanged(

846

dbus.String("CheckerRunning"),

847

dbus.Boolean(True, variant_level=1))

1133

848

return r

1134

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

1135

859

def _reset_approved(self):

1136

self.approved = None

860

self._approved = None

1137

861

return False

1138

862

1139

863

def approve(self, value=True):

1140

864

self.send_changedstate()

1141

self.approved = value

1142

gobject.timeout_add(timedelta_to_milliseconds

865

self._approved = value

866

gobject.timeout_add(self._timedelta_to_milliseconds

1143

867

(self.approval_duration),

1144

868

self._reset_approved)

1145

869

1146

870

1147

871

## D-Bus methods, signals & properties

1148

_interface = "se.recompile.Mandos.Client"

872

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

1149

873

1150

874

## Signals

1151

875

1188

912

"D-Bus signal"

1189

913

return self.need_approval()

1190

914

1191

# NeRwequest - signal

1192

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

1193

def NewRequest(self, ip):

1194

"""D-Bus signal

1195

Is sent after a client request a password.

1196

"""

1197

pass

1198

1199

915

## Methods

1200

916

1201

917

# Approve - method

1206

922

# CheckedOK - method

1207

923

@dbus.service.method(_interface)

1208

924

def CheckedOK(self):

1209

self.checked_ok()

925

return self.checked_ok()

1210

926

1211

927

# Enable - method

1212

928

@dbus.service.method(_interface)

1245

961

if value is None: # get

1246

962

return dbus.Boolean(self.approved_by_default)

1247

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))

1248

967

1249

968

# ApprovalDelay - property

1250

969

@dbus_service_property(_interface, signature="t",

1253

972

if value is None: # get

1254

973

return dbus.UInt64(self.approval_delay_milliseconds())

1255

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))

1256

978

1257

979

# ApprovalDuration - property

1258

980

@dbus_service_property(_interface, signature="t",

1259

981

access="readwrite")

1260

982

def ApprovalDuration_dbus_property(self, value=None):

1261

983

if value is None: # get

1262

return dbus.UInt64(timedelta_to_milliseconds(

984

return dbus.UInt64(self._timedelta_to_milliseconds(

1263

985

self.approval_duration))

1264

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))

1265

990

1266

991

# Name - property

1267

992

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

1280

1005

if value is None: # get

1281

1006

return dbus.String(self.host)

1282

1007

self.host = value

1008

# Emit D-Bus signal

1009

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

1010

dbus.String(value, variant_level=1))

1283

1011

1284

1012

# Created - property

1285

1013

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

1286

1014

def Created_dbus_property(self):

1287

return datetime_to_dbus(self.created)

1015

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

1288

1016

1289

1017

# LastEnabled - property

1290

1018

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

1291

1019

def LastEnabled_dbus_property(self):

1292

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))

1293

1023

1294

1024

# Enabled - property

1295

1025

@dbus_service_property(_interface, signature="b",

1309

1039

if value is not None:

1310

1040

self.checked_ok()

1311

1041

return

1312

return datetime_to_dbus(self.last_checked_ok)

1313

1314

# Expires - property

1315

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

1316

def Expires_dbus_property(self):

1317

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))

1318

1046

1319

1047

# LastApprovalRequest - property

1320

1048

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

1321

1049

def LastApprovalRequest_dbus_property(self):

1322

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))

1323

1055

1324

1056

# Timeout - property

1325

1057

@dbus_service_property(_interface, signature="t",

1328

1060

if value is None: # get

1329

1061

return dbus.UInt64(self.timeout_milliseconds())

1330

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))

1331

1066

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

1332

1067

return

1333

1068

# Reschedule timeout

1334

1069

gobject.source_remove(self.disable_initiator_tag)

1335

1070

self.disable_initiator_tag = None

1336

self.expires = None

1337

time_to_die = timedelta_to_milliseconds((self

1338

.last_checked_ok

1339

+ self.timeout)

1340

- datetime.datetime

1341

.utcnow())

1071

time_to_die = (self.

1072

_timedelta_to_milliseconds((self

1073

.last_checked_ok

1074

+ self.timeout)

1075

- datetime.datetime

1076

.utcnow()))

1342

1077

if time_to_die <= 0:

1343

1078

# The timeout has passed

1344

1079

self.disable()

1345

1080

else:

1346

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

1347

+ datetime.timedelta(milliseconds =

1348

time_to_die))

1349

1081

self.disable_initiator_tag = (gobject.timeout_add

1350

1082

(time_to_die, self.disable))

1351

1083

1352

# ExtendedTimeout - property

1353

@dbus_service_property(_interface, signature="t",

1354

access="readwrite")

1355

def ExtendedTimeout_dbus_property(self, value=None):

1356

if value is None: # get

1357

return dbus.UInt64(self.extended_timeout_milliseconds())

1358

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

1359

1360

1084

# Interval - property

1361

1085

@dbus_service_property(_interface, signature="t",

1362

1086

access="readwrite")

1364

1088

if value is None: # get

1365

1089

return dbus.UInt64(self.interval_milliseconds())

1366

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))

1367

1094

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

1368

1095

return

1369

if self.enabled:

1370

# Reschedule checker run

1371

gobject.source_remove(self.checker_initiator_tag)

1372

self.checker_initiator_tag = (gobject.timeout_add

1373

(value, self.start_checker))

1374

self.start_checker() # Start one now, too

1375

1096

# Reschedule checker run

1097

gobject.source_remove(self.checker_initiator_tag)

1098

self.checker_initiator_tag = (gobject.timeout_add

1099

(value, self.start_checker))

1100

self.start_checker() # Start one now, too

1101

1376

1102

# Checker - property

1377

1103

@dbus_service_property(_interface, signature="s",

1378

1104

access="readwrite")

1380

1106

if value is None: # get

1381

1107

return dbus.String(self.checker_command)

1382

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))

1383

1113

1384

1114

# CheckerRunning - property

1385

1115

@dbus_service_property(_interface, signature="b",

1412

1142

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

1413

1143

if not self._pipe.recv():

1414

1144

raise KeyError()

1415

1145

1416

1146

def __getattribute__(self, name):

1417

if name == '_pipe':

1147

if(name == '_pipe'):

1418

1148

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

1419

1149

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

1420

1150

data = self._pipe.recv()

1425

1155

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

1426

1156

return self._pipe.recv()[1]

1427

1157

return func

1428

1158

1429

1159

def __setattr__(self, name, value):

1430

if name == '_pipe':

1160

if(name == '_pipe'):

1431

1161

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

1432

1162

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

1433

1163

1434

1164

1435

class ClientDBusTransitional(ClientDBus):

1436

__metaclass__ = AlternateDBusNamesMetaclass

1437

1438

1439

1165

class ClientHandler(socketserver.BaseRequestHandler, object):

1440

1166

"""A class to handle client connections.

1441

1167

1448

1174

unicode(self.client_address))

1449

1175

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

1450

1176

self.server.child_pipe.fileno())

1451

1177

1452

1178

session = (gnutls.connection

1453

1179

.ClientSession(self.request,

1454

1180

gnutls.connection

1455

1181

.X509Credentials()))

1456

1182

1457

1183

# Note: gnutls.connection.X509Credentials is really a

1458

1184

# generic GnuTLS certificate credentials object so long as

1459

1185

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

1460

1186

# here despite using OpenPGP certificates.

1461

1187

1462

1188

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

1463

1189

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

1464

1190

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

1470

1196

(gnutls.library.functions

1471

1197

.gnutls_priority_set_direct(session._c_object,

1472

1198

priority, None))

1473

1199

1474

1200

# Start communication using the Mandos protocol

1475

1201

# Get protocol number

1476

1202

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

1478

1204

try:

1479

1205

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

1480

1206

raise RuntimeError

1481

except (ValueError, IndexError, RuntimeError) as error:

1207

except (ValueError, IndexError, RuntimeError), error:

1482

1208

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

1483

1209

return

1484

1210

1485

1211

# Start GnuTLS connection

1486

1212

try:

1487

1213

session.handshake()

1488

except gnutls.errors.GNUTLSError as error:

1214

except gnutls.errors.GNUTLSError, error:

1489

1215

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

1490

1216

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

1491

1217

# established. Just abandon the request.

1492

1218

return

1493

1219

logger.debug("Handshake succeeded")

1494

1220

1495

1221

approval_required = False

1496

1222

try:

1497

1223

try:

1498

1224

fpr = self.fingerprint(self.peer_certificate

1499

1225

(session))

1500

except (TypeError,

1501

gnutls.errors.GNUTLSError) as error:

1226

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

1502

1227

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

1503

1228

return

1504

1229

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

1505

1230

1506

1231

try:

1507

1232

client = ProxyClient(child_pipe, fpr,

1508

1233

self.client_address)

1509

1234

except KeyError:

1510

1235

return

1511

1236

1512

if self.server.use_dbus:

1513

# Emit D-Bus signal

1514

client.NewRequest(str(self.client_address))

1515

1516

1237

if client.approval_delay:

1517

1238

delay = client.approval_delay

1518

1239

client.approvals_pending += 1

1520

1241

1521

1242

while True:

1522

1243

if not client.enabled:

1523

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

1244

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

1524

1245

client.name)

1525

1246

if self.server.use_dbus:

1526

1247

# Emit D-Bus signal

1527

client.Rejected("Disabled")

1248

client.Rejected("Disabled")

1528

1249

return

1529

1250

1530

if client.approved or not client.approval_delay:

1251

if client._approved or not client.approval_delay:

1531

1252

#We are approved or approval is disabled

1532

1253

break

1533

elif client.approved is None:

1254

elif client._approved is None:

1534

1255

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

1535

1256

client.name)

1536

1257

if self.server.use_dbus:

1547

1268

return

1548

1269

1549

1270

#wait until timeout or approved

1271

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

1550

1272

time = datetime.datetime.now()

1551

1273

client.changedstate.acquire()

1552

(client.changedstate.wait

1553

(float(client.timedelta_to_milliseconds(delay)

1554

/ 1000)))

1274

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

1555

1275

client.changedstate.release()

1556

1276

time2 = datetime.datetime.now()

1557

1277

if (time2 - time) >= delay:

1572

1292

while sent_size < len(client.secret):

1573

1293

try:

1574

1294

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

1575

except gnutls.errors.GNUTLSError as error:

1295

except (gnutls.errors.GNUTLSError), error:

1576

1296

logger.warning("gnutls send failed")

1577

1297

return

1578

1298

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

1579

1299

sent, len(client.secret)

1580

1300

- (sent_size + sent))

1581

1301

sent_size += sent

1582

1302

1583

1303

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

1584

# bump the timeout using extended_timeout

1585

client.checked_ok(client.extended_timeout)

1304

# bump the timeout as if seen

1305

client.checked_ok()

1586

1306

if self.server.use_dbus:

1587

1307

# Emit D-Bus signal

1588

1308

client.GotSecret()

1592

1312

client.approvals_pending -= 1

1593

1313

try:

1594

1314

session.bye()

1595

except gnutls.errors.GNUTLSError as error:

1315

except (gnutls.errors.GNUTLSError), error:

1596

1316

logger.warning("GnuTLS bye failed")

1597

1317

1598

1318

@staticmethod

1655

1375

# Convert the buffer to a Python bytestring

1656

1376

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

1657

1377

# Convert the bytestring to hexadecimal notation

1658

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

1378

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

1659

1379

return hex_fpr

1660

1380

1661

1381

1667

1387

except:

1668

1388

self.handle_error(request, address)

1669

1389

self.close_request(request)

1670

1390

1671

1391

def process_request(self, request, address):

1672

1392

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

1673

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

1674

args = (request,

1675

address))

1676

proc.start()

1677

return proc

1678

1393

multiprocessing.Process(target = self.sub_process_main,

1394

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

1679

1395

1680

1396

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1681

1397

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

1685

1401

This function creates a new pipe in self.pipe

1686

1402

"""

1687

1403

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1688

1689

proc = MultiprocessingMixIn.process_request(self, request,

1690

client_address)

1404

1405

super(MultiprocessingMixInWithPipe,

1406

self).process_request(request, client_address)

1691

1407

self.child_pipe.close()

1692

self.add_pipe(parent_pipe, proc)

1693

1694

def add_pipe(self, parent_pipe, proc):

1408

self.add_pipe(parent_pipe)

1409

1410

def add_pipe(self, parent_pipe):

1695

1411

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

1696

1412

raise NotImplementedError

1697

1413

1698

1699

1414

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1700

1415

socketserver.TCPServer, object):

1701

1416

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

1727

1442

SO_BINDTODEVICE,

1728

1443

str(self.interface

1729

1444

+ '\0'))

1730

except socket.error as error:

1445

except socket.error, error:

1731

1446

if error[0] == errno.EPERM:

1732

1447

logger.error("No permission to"

1733

1448

" bind to interface %s",

1775

1490

self.enabled = False

1776

1491

self.clients = clients

1777

1492

if self.clients is None:

1778

self.clients = {}

1493

self.clients = set()

1779

1494

self.use_dbus = use_dbus

1780

1495

self.gnutls_priority = gnutls_priority

1781

1496

IPv6_TCPServer.__init__(self, server_address,

1785

1500

def server_activate(self):

1786

1501

if self.enabled:

1787

1502

return socketserver.TCPServer.server_activate(self)

1788

1789

1503

def enable(self):

1790

1504

self.enabled = True

1791

1792

def add_pipe(self, parent_pipe, proc):

1505

def add_pipe(self, parent_pipe):

1793

1506

# Call "handle_ipc" for both data and EOF events

1794

1507

gobject.io_add_watch(parent_pipe.fileno(),

1795

1508

gobject.IO_IN | gobject.IO_HUP,

1796

1509

functools.partial(self.handle_ipc,

1797

parent_pipe =

1798

parent_pipe,

1799

proc = proc))

1800

1510

parent_pipe = parent_pipe))

1511

1801

1512

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

1802

proc = None, client_object=None):

1513

client_object=None):

1803

1514

condition_names = {

1804

1515

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

1805

1516

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

1814

1525

for cond, name in

1815

1526

condition_names.iteritems()

1816

1527

if cond & condition)

1817

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

1528

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

1818

1529

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

1819

# Wait for other process to exit

1820

proc.join()

1821

1530

return False

1822

1531

1823

1532

# Read a request from the child

1828

1537

fpr = request[1]

1829

1538

address = request[2]

1830

1539

1831

for c in self.clients.itervalues():

1540

for c in self.clients:

1832

1541

if c.fingerprint == fpr:

1833

1542

client = c

1834

1543

break

1835

1544

else:

1836

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

1837

"dress: %s", fpr, address)

1545

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

1546

"dress: %s", fpr, address)

1838

1547

if self.use_dbus:

1839

1548

# Emit D-Bus signal

1840

mandos_dbus_service.ClientNotFound(fpr,

1841

address[0])

1549

mandos_dbus_service.ClientNotFound(fpr, address[0])

1842

1550

parent_pipe.send(False)

1843

1551

return False

1844

1552

1845

1553

gobject.io_add_watch(parent_pipe.fileno(),

1846

1554

gobject.IO_IN | gobject.IO_HUP,

1847

1555

functools.partial(self.handle_ipc,

1848

parent_pipe =

1849

parent_pipe,

1850

proc = proc,

1851

client_object =

1852

client))

1556

parent_pipe = parent_pipe,

1557

client_object = client))

1853

1558

parent_pipe.send(True)

1854

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

1855

# same fileno

1559

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

1856

1560

return False

1857

1561

if command == 'funcall':

1858

1562

funcname = request[1]

1859

1563

args = request[2]

1860

1564

kwargs = request[3]

1861

1565

1862

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

1863

funcname)(*args,

1864

**kwargs)))

1865

1566

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

1567

1866

1568

if command == 'getattr':

1867

1569

attrname = request[1]

1868

1570

if callable(client_object.__getattribute__(attrname)):

1869

1571

parent_pipe.send(('function',))

1870

1572

else:

1871

parent_pipe.send(('data', client_object

1872

.__getattribute__(attrname)))

1573

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

1873

1574

1874

1575

if command == 'setattr':

1875

1576

attrname = request[1]

1876

1577

value = request[2]

1877

1578

setattr(client_object, attrname, value)

1878

1579

1879

1580

return True

1880

1581

1881

1582

1912

1613

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

1913

1614

else:

1914

1615

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

1915

except (ValueError, IndexError) as e:

1616

except (ValueError, IndexError), e:

1916

1617

raise ValueError(*(e.args))

1917

1618

timevalue += delta

1918

1619

return timevalue

1919

1620

1920

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

1921

1646

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

1922

1647

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

1923

1648

1948

1673

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

1949

1674

# Parsing of options, both command line and config file

1950

1675

1951

parser = argparse.ArgumentParser()

1952

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

1953

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

1954

help="show version number and exit")

1955

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

1956

help="Bind to interface IF")

1957

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

1958

help="Address to listen for requests on")

1959

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

1960

help="Port number to receive requests on")

1961

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

1962

help="Run self-test")

1963

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

1964

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

1965

" to terminal")

1966

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

1967

help="Debug level for stdout output")

1968

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

1969

" priority string (see GnuTLS documentation)")

1970

parser.add_argument("--servicename",

1971

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

1972

parser.add_argument("--configdir",

1973

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

1974

help="Directory to search for configuration"

1975

" files")

1976

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

1977

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

1978

" system bus interface")

1979

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

1980

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

1981

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

1982

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

1983

" state")

1984

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

1985

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

1986

1987

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]

1988

1704

1989

1705

if options.check:

1990

1706

import doctest

2002

1718

"use_dbus": "True",

2003

1719

"use_ipv6": "True",

2004

1720

"debuglevel": "",

2005

"restore": "True",

2006

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

2007

1721

}

2008

1722

2009

1723

# Parse config file for server-global settings

2026

1740

# options, if set.

2027

1741

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

2028

1742

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

2029

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

2030

"statedir"):

1743

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

2031

1744

value = getattr(options, option)

2032

1745

if value is not None:

2033

1746

server_settings[option] = value

2045

1758

debuglevel = server_settings["debuglevel"]

2046

1759

use_dbus = server_settings["use_dbus"]

2047

1760

use_ipv6 = server_settings["use_ipv6"]

2048

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

2049

stored_state_file)

2050

2051

if debug:

2052

initlogger(logging.DEBUG)

2053

else:

2054

if not debuglevel:

2055

initlogger()

2056

else:

2057

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

2058

initlogger(level)

2059

1761

2060

1762

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

2061

1763

syslogger.setFormatter(logging.Formatter

2062

1764

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

2064

1766

% server_settings["servicename"]))

2065

1767

2066

1768

# Parse config file with clients

2067

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

2068

"extended_timeout": "15m",

2069

"interval": "2m",

1769

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

1770

"interval": "5m",

2070

1771

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

2071

1772

"host": "",

2072

1773

"approval_delay": "0s",

2112

1813

try:

2113

1814

os.setgid(gid)

2114

1815

os.setuid(uid)

2115

except OSError as error:

1816

except OSError, error:

2116

1817

if error[0] != errno.EPERM:

2117

1818

raise error

2118

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

2119

1828

if debug:

2120

1829

# Enable all possible GnuTLS debugging

2121

1830

2152

1861

# End of Avahi example code

2153

1862

if use_dbus:

2154

1863

try:

2155

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

1864

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

2156

1865

bus, do_not_queue=True)

2157

old_bus_name = (dbus.service.BusName

2158

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

2159

do_not_queue=True))

2160

except dbus.exceptions.NameExistsException as e:

1866

except dbus.exceptions.NameExistsException, e:

2161

1867

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

2162

1868

use_dbus = False

2163

1869

server_settings["use_dbus"] = False

2164

1870

tcp_server.use_dbus = False

2165

1871

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2166

service = AvahiServiceToSyslog(name =

2167

server_settings["servicename"],

2168

servicetype = "_mandos._tcp",

2169

protocol = protocol, bus = bus)

1872

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

1873

servicetype = "_mandos._tcp",

1874

protocol = protocol, bus = bus)

2170

1875

if server_settings["interface"]:

2171

1876

service.interface = (if_nametoindex

2172

1877

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

2176

1881

2177

1882

client_class = Client

2178

1883

if use_dbus:

2179

client_class = functools.partial(ClientDBusTransitional,

2180

bus = bus)

2181

2182

special_settings = {

2183

# Some settings need to be accessd by special methods;

2184

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

2185

"approved_by_default":

2186

lambda section:

2187

client_config.getboolean(section, "approved_by_default"),

2188

"enabled":

2189

lambda section:

2190

client_config.getboolean(section, "enabled"),

2191

}

2192

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

2193

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

2194

# with exceptions for any special settings as defined above

2195

client_settings = dict((clientname,

2196

dict((setting,

2197

(value

2198

if setting not in special_settings

2199

else special_settings[setting]

2200

(clientname)))

2201

for setting, value in

2202

client_config.items(clientname)))

2203

for clientname in client_config.sections())

2204

2205

old_client_settings = {}

2206

clients_data = []

2207

2208

# Get client data and settings from last running state.

2209

if server_settings["restore"]:

2210

try:

2211

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

2212

clients_data, old_client_settings = (pickle.load

2213

(stored_state))

2214

os.remove(stored_state_path)

2215

except IOError as e:

2216

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

2217

.format(e))

2218

if e.errno != errno.ENOENT:

2219

raise

2220

2221

with Crypto() as crypt:

2222

for client in clients_data:

2223

client_name = client["name"]

2224

2225

# Decide which value to use after restoring saved state.

2226

# We have three different values: Old config file,

2227

# new config file, and saved state.

2228

# New config value takes precedence if it differs from old

2229

# config value, otherwise use saved state.

2230

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

2231

try:

2232

# For each value in new config, check if it

2233

# differs from the old config value (Except for

2234

# the "secret" attribute)

2235

if (name != "secret" and

2236

value != old_client_settings[client_name]

2237

[name]):

2238

setattr(client, name, value)

2239

except KeyError:

2240

pass

2241

2242

# Clients who has passed its expire date can still be

2243

# enabled if its last checker was sucessful. Clients

2244

# whose checker failed before we stored its state is

2245

# assumed to have failed all checkers during downtime.

2246

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

2247

if ((datetime.datetime.utcnow()

2248

- client["last_checked_ok"])

2249

> client["interval"]):

2250

if client["last_checker_status"] != 0:

2251

client["enabled"] = False

2252

else:

2253

client["expires"] = (datetime.datetime

2254

.utcnow()

2255

+ client["timeout"])

2256

2257

client["changedstate"] = (multiprocessing_manager

2258

.Condition

2259

(multiprocessing_manager

2260

.Lock()))

2261

if use_dbus:

2262

new_client = (ClientDBusTransitional.__new__

2263

(ClientDBusTransitional))

2264

tcp_server.clients[client_name] = new_client

2265

new_client.bus = bus

2266

for name, value in client.iteritems():

2267

setattr(new_client, name, value)

2268

client_object_name = unicode(client_name).translate(

2269

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

2270

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

2271

new_client.dbus_object_path = (dbus.ObjectPath

2272

("/clients/"

2273

+ client_object_name))

2274

DBusObjectWithProperties.__init__(new_client,

2275

new_client.bus,

2276

new_client

2277

.dbus_object_path)

2278

else:

2279

tcp_server.clients[client_name] = (Client.__new__

2280

(Client))

2281

for name, value in client.iteritems():

2282

setattr(tcp_server.clients[client_name],

2283

name, value)

2284

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):

2285

1892

try:

2286

tcp_server.clients[client_name].secret = (

2287

crypt.decrypt(tcp_server.clients[client_name]

2288

.encrypted_secret,

2289

client_settings[client_name]

2290

["secret"]))

2291

except CryptoError:

2292

# If decryption fails, we use secret from new settings

2293

tcp_server.clients[client_name].secret = (

2294

client_settings[client_name]["secret"])

2295

2296

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

2297

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

2298

del tcp_server.clients[clientname]

2299

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

2300

tcp_server.clients[clientname] = (client_class(name

2301

= clientname,

2302

config =

2303

client_settings

2304

[clientname]))

2305

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()))

2306

1902

if not tcp_server.clients:

2307

1903

logger.warning("No clients defined")

2308

1904

2321

1917

del pidfilename

2322

1918

2323

1919

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

2324

1920

2325

1921

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

2326

1922

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

2327

1923

2330

1926

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

2331

1927

def __init__(self):

2332

1928

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

2333

_interface = "se.recompile.Mandos"

1929

_interface = "se.bsnet.fukt.Mandos"

2334

1930

2335

1931

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

2336

1932

def ClientAdded(self, objpath):

2351

1947

def GetAllClients(self):

2352

1948

"D-Bus method"

2353

1949

return dbus.Array(c.dbus_object_path

2354

for c in

2355

tcp_server.clients.itervalues())

1950

for c in tcp_server.clients)

2356

1951

2357

1952

@dbus.service.method(_interface,

2358

1953

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

2360

1955

"D-Bus method"

2361

1956

return dbus.Dictionary(

2362

1957

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

2363

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

1958

for c in tcp_server.clients),

2364

1959

signature="oa{sv}")

2365

1960

2366

1961

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

2367

1962

def RemoveClient(self, object_path):

2368

1963

"D-Bus method"

2369

for c in tcp_server.clients.itervalues():

1964

for c in tcp_server.clients:

2370

1965

if c.dbus_object_path == object_path:

2371

del tcp_server.clients[c.name]

1966

tcp_server.clients.remove(c)

2372

1967

c.remove_from_connection()

2373

1968

# Don't signal anything except ClientRemoved

2374

1969

c.disable(quiet=True)

2379

1974

2380

1975

del _interface

2381

1976

2382

class MandosDBusServiceTransitional(MandosDBusService):

2383

__metaclass__ = AlternateDBusNamesMetaclass

2384

mandos_dbus_service = MandosDBusServiceTransitional()

1977

mandos_dbus_service = MandosDBusService()

2385

1978

2386

1979

def cleanup():

2387

1980

"Cleanup function; run on exit"

2388

1981

service.cleanup()

2389

1982

2390

multiprocessing.active_children()

2391

if not (tcp_server.clients or client_settings):

2392

return

2393

2394

# Store client before exiting. Secrets are encrypted with key

2395

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

2396

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

2397

clients = []

2398

with Crypto() as crypt:

2399

for client in tcp_server.clients.itervalues():

2400

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

2401

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

2402

key)

2403

client_dict = {}

2404

2405

# A list of attributes that will not be stored when

2406

# shutting down.

2407

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

2408

for name, typ in (inspect.getmembers

2409

(dbus.service.Object)):

2410

exclude.add(name)

2411

2412

client_dict["encrypted_secret"] = (client

2413

.encrypted_secret)

2414

for attr in client.client_structure:

2415

if attr not in exclude:

2416

client_dict[attr] = getattr(client, attr)

2417

2418

clients.append(client_dict)

2419

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

2420

2421

try:

2422

with os.fdopen(os.open(stored_state_path,

2423

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

2424

0600), "wb") as stored_state:

2425

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

2426

except (IOError, OSError) as e:

2427

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

2428

.format(e))

2429

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

2430

raise

2431

2432

# Delete all clients, and settings from config

2433

1983

while tcp_server.clients:

2434

name, client = tcp_server.clients.popitem()

1984

client = tcp_server.clients.pop()

2435

1985

if use_dbus:

2436

1986

client.remove_from_connection()

1987

client.disable_hook = None

2437

1988

# Don't signal anything except ClientRemoved

2438

1989

client.disable(quiet=True)

2439

1990

if use_dbus:

2440

1991

# Emit D-Bus signal

2441

mandos_dbus_service.ClientRemoved(client

2442

.dbus_object_path,

1992

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2443

1993

client.name)

2444

client_settings.clear()

2445

1994

2446

1995

atexit.register(cleanup)

2447

1996

2448

for client in tcp_server.clients.itervalues():

1997

for client in tcp_server.clients:

2449

1998

if use_dbus:

2450

1999

# Emit D-Bus signal

2451

2000

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2452

# Need to initiate checking of clients

2453

if client.enabled:

2454

client.init_checker()

2001

client.enable()

2455

2002

2456

2003

tcp_server.enable()

2457

2004

tcp_server.server_activate()

2472

2019

# From the Avahi example code

2473

2020

try:

2474

2021

service.activate()

2475

except dbus.exceptions.DBusException as error:

2022

except dbus.exceptions.DBusException, error:

2476

2023

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

2477

2024

cleanup()

2478

2025

sys.exit(1)

2485

2032

2486

2033

logger.debug("Starting main loop")

2487

2034

main_loop.run()

2488

except AvahiError as error:

2035

except AvahiError, error:

2489

2036

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

2490

2037

cleanup()

2491

2038

sys.exit(1)

2497

2044

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

2498

2045

cleanup()

2499

2046

2500

2501

2047

if __name__ == '__main__':

2502

2048

main()