/mandos/trunk : revision 518.2.3

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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@fukt.bsnet.se>.

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# Contact the authors at <mandos@recompile.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 optparse

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import argparse

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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 = "1.2.3"

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version = "1.4.1"

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stored_state_file = "clients.pickle"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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logger = logging.getLogger()

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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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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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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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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.GetAlternativeServiceName(self.name))

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self.name = unicode(self.server

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.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, error:

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except dbus.exceptions.DBusException as 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.group.connect_to_signal('StateChanged',

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self

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.entry_group_state_changed)

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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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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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self.group.Free()

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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):

331

pass

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self.group = None

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def server_state_changed(self, state):

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self.remove()

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

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

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

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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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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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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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avahi.DBUS_PATH_SERVER,

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follow_name_owner_changes=True),

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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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379

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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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388

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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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402

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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405

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_enabled: datetime.datetime(); (UTC)

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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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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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422

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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428

"""

275

429

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runtime_expansions = ("approval_delay", "approval_duration",

278

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

279

433

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

280

434

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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))

287

288

435

def timeout_milliseconds(self):

289

436

"Return the 'timeout' attribute in milliseconds"

290

return self._timedelta_to_milliseconds(self.timeout)

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)

291

442

292

443

def interval_milliseconds(self):

293

444

"Return the 'interval' attribute in milliseconds"

294

return self._timedelta_to_milliseconds(self.interval)

295

445

return _timedelta_to_milliseconds(self.interval)

446

296

447

def approval_delay_milliseconds(self):

297

return self._timedelta_to_milliseconds(self.approval_delay)

448

return _timedelta_to_milliseconds(self.approval_delay)

298

449

299

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

450

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

300

451

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

301

452

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

302

453

attribute."""

322

473

% self.name)

323

474

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

324

475

self.created = datetime.datetime.utcnow()

325

self.enabled = False

476

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

326

477

self.last_approval_request = None

327

self.last_enabled = None

478

if self.enabled:

479

self.last_enabled = datetime.datetime.utcnow()

480

else:

481

self.last_enabled = None

328

482

self.last_checked_ok = None

483

self.last_checker_status = None

329

484

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

485

self.extended_timeout = string_to_delta(config

486

["extended_timeout"])

330

487

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

331

self.disable_hook = disable_hook

332

488

self.checker = None

333

489

self.checker_initiator_tag = None

334

490

self.disable_initiator_tag = None

491

if self.enabled:

492

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

493

else:

494

self.expires = None

335

495

self.checker_callback_tag = None

336

496

self.checker_command = config["checker"]

337

497

self.current_checker_command = None

338

self.last_connect = None

339

498

self._approved = None

340

499

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

341

500

True)

344

503

config["approval_delay"])

345

504

self.approval_duration = string_to_delta(

346

505

config["approval_duration"])

347

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

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)

348

520

521

# Send notice to process children that client state has changed

349

522

def send_changedstate(self):

350

self.changedstate.acquire()

351

self.changedstate.notify_all()

352

self.changedstate.release()

353

523

with self.changedstate:

524

self.changedstate.notify_all()

525

354

526

def enable(self):

355

527

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

356

528

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

357

529

# Already enabled

358

530

return

359

531

self.send_changedstate()

532

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

533

self.enabled = True

360

534

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))

370

self.enabled = True

371

# Also start a new checker *right now*.

372

self.start_checker()

535

self.init_checker()

373

536

374

537

def disable(self, quiet=True):

375

538

"""Disable this client."""

382

545

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

383

546

gobject.source_remove(self.disable_initiator_tag)

384

547

self.disable_initiator_tag = None

548

self.expires = None

385

549

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

386

550

gobject.source_remove(self.checker_initiator_tag)

387

551

self.checker_initiator_tag = None

388

552

self.stop_checker()

389

if self.disable_hook:

390

self.disable_hook(self)

391

553

self.enabled = False

392

554

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

393

555

return False

394

556

395

557

def __del__(self):

396

self.disable_hook = None

397

558

self.disable()

398

559

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

399

573

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

400

574

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

401

575

self.checker_callback_tag = None

402

576

self.checker = None

403

577

if os.WIFEXITED(condition):

404

exitstatus = os.WEXITSTATUS(condition)

405

if exitstatus == 0:

578

self.last_checker_status = os.WEXITSTATUS(condition)

579

if self.last_checker_status == 0:

406

580

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

407

581

vars(self))

408

582

self.checked_ok()

410

584

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

411

585

vars(self))

412

586

else:

587

self.last_checker_status = -1

413

588

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

414

589

vars(self))

415

590

416

def checked_ok(self):

591

def checked_ok(self, timeout=None):

417

592

"""Bump up the timeout for this client.

418

593

419

594

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

420

595

alive and well.

421

596

"""

597

if timeout is None:

598

timeout = self.timeout

422

599

self.last_checked_ok = datetime.datetime.utcnow()

423

gobject.source_remove(self.disable_initiator_tag)

424

self.disable_initiator_tag = (gobject.timeout_add

425

(self.timeout_milliseconds(),

426

self.disable))

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

427

607

428

608

def need_approval(self):

429

609

self.last_approval_request = datetime.datetime.utcnow()

445

625

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

446

626

try:

447

627

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

448

except (AttributeError, OSError), error:

628

except (AttributeError, OSError) as error:

449

629

if (isinstance(error, OSError)

450

630

and error.errno != errno.ECHILD):

451

631

raise error

469

649

'replace')))

470

650

for attr in

471

651

self.runtime_expansions)

472

652

473

653

try:

474

654

command = self.checker_command % escaped_attrs

475

except TypeError, error:

655

except TypeError as error:

476

656

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

477

657

' %s', self.checker_command, error)

478

658

return True # Try again later

497

677

if pid:

498

678

gobject.source_remove(self.checker_callback_tag)

499

679

self.checker_callback(pid, status, command)

500

except OSError, error:

680

except OSError as error:

501

681

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

502

682

error)

503

683

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

516

696

#time.sleep(0.5)

517

697

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

518

698

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

519

except OSError, error:

699

except OSError as error:

520

700

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

521

701

raise

522

702

self.checker = None

523

703

704

524

705

def dbus_service_property(dbus_interface, signature="v",

525

706

access="readwrite", byte_arrays=False):

526

707

"""Decorators for marking methods of a DBusObjectWithProperties to

572

753

573

754

class DBusObjectWithProperties(dbus.service.Object):

574

755

"""A D-Bus object with properties.

575

756

576

757

Classes inheriting from this can use the dbus_service_property

577

758

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

578

759

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

585

766

def _get_all_dbus_properties(self):

586

767

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

587

768

"""

588

return ((prop._dbus_name, prop)

769

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

770

for cls in self.__class__.__mro__

589

771

for name, prop in

590

inspect.getmembers(self, self._is_dbus_property))

772

inspect.getmembers(cls, self._is_dbus_property))

591

773

592

774

def _get_dbus_property(self, interface_name, property_name):

593

775

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

594

776

property with the specified name and interface.

595

777

"""

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

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

606

785

# No such property

607

786

raise DBusPropertyNotFound(self.dbus_object_path + ":"

608

787

+ interface_name + "."

642

821

def GetAll(self, interface_name):

643

822

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

644

823

standard.

645

824

646

825

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

647

826

"""

648

all = {}

827

properties = {}

649

828

for name, prop in self._get_all_dbus_properties():

650

829

if (interface_name

651

830

and interface_name != prop._dbus_interface):

656

835

continue

657

836

value = prop()

658

837

if not hasattr(value, "variant_level"):

659

all[name] = value

838

properties[name] = value

660

839

continue

661

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

662

value.variant_level+1)

663

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

840

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

841

value.variant_level+1)

842

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

664

843

665

844

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

666

845

out_signature="s",

704

883

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

705

884

document.unlink()

706

885

except (AttributeError, xml.dom.DOMException,

707

xml.parsers.expat.ExpatError), error:

886

xml.parsers.expat.ExpatError) as error:

708

887

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

709

888

error)

710

889

return xmlstring

711

890

712

891

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

713

998

class ClientDBus(Client, DBusObjectWithProperties):

714

999

"""A Client class using D-Bus

715

1000

724

1009

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

725

1010

726

1011

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

1012

self.bus = bus

1013

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

1014

727

1015

self._approvals_pending = 0

728

self.bus = bus

729

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

730

1016

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

731

1017

# the D-Bus

732

1018

client_object_name = unicode(self.name).translate(

737

1023

DBusObjectWithProperties.__init__(self, self.bus,

738

1024

self.dbus_object_path)

739

1025

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

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

783

1092

784

1093

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

785

1094

try:

794

1103

*args, **kwargs):

795

1104

self.checker_callback_tag = None

796

1105

self.checker = None

797

# Emit D-Bus signal

798

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

799

dbus.Boolean(False, variant_level=1))

800

1106

if os.WIFEXITED(condition):

801

1107

exitstatus = os.WEXITSTATUS(condition)

802

1108

# Emit D-Bus signal

812

1118

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

813

1119

*args, **kwargs)

814

1120

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

833

1121

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

834

1122

old_checker = self.checker

835

1123

if self.checker is not None:

842

1130

and old_checker_pid != self.checker.pid):

843

1131

# Emit D-Bus signal

844

1132

self.CheckerStarted(self.current_checker_command)

845

self.PropertyChanged(

846

dbus.String("CheckerRunning"),

847

dbus.Boolean(True, variant_level=1))

848

1133

return r

849

1134

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

859

1135

def _reset_approved(self):

860

1136

self._approved = None

861

1137

return False

863

1139

def approve(self, value=True):

864

1140

self.send_changedstate()

865

1141

self._approved = value

866

gobject.timeout_add(self._timedelta_to_milliseconds

1142

gobject.timeout_add(_timedelta_to_milliseconds

867

1143

(self.approval_duration),

868

1144

self._reset_approved)

869

1145

870

1146

871

1147

## D-Bus methods, signals & properties

872

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

1148

_interface = "se.recompile.Mandos.Client"

873

1149

874

1150

## Signals

875

1151

912

1188

"D-Bus signal"

913

1189

return self.need_approval()

914

1190

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

915

1199

## Methods

916

1200

917

1201

# Approve - method

922

1206

# CheckedOK - method

923

1207

@dbus.service.method(_interface)

924

1208

def CheckedOK(self):

925

return self.checked_ok()

1209

self.checked_ok()

926

1210

927

1211

# Enable - method

928

1212

@dbus.service.method(_interface)

961

1245

if value is None: # get

962

1246

return dbus.Boolean(self.approved_by_default)

963

1247

self.approved_by_default = bool(value)

964

# Emit D-Bus signal

965

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

966

dbus.Boolean(value, variant_level=1))

967

1248

968

1249

# ApprovalDelay - property

969

1250

@dbus_service_property(_interface, signature="t",

972

1253

if value is None: # get

973

1254

return dbus.UInt64(self.approval_delay_milliseconds())

974

1255

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))

978

1256

979

1257

# ApprovalDuration - property

980

1258

@dbus_service_property(_interface, signature="t",

981

1259

access="readwrite")

982

1260

def ApprovalDuration_dbus_property(self, value=None):

983

1261

if value is None: # get

984

return dbus.UInt64(self._timedelta_to_milliseconds(

1262

return dbus.UInt64(_timedelta_to_milliseconds(

985

1263

self.approval_duration))

986

1264

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))

990

1265

991

1266

# Name - property

992

1267

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

1005

1280

if value is None: # get

1006

1281

return dbus.String(self.host)

1007

1282

self.host = value

1008

# Emit D-Bus signal

1009

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

1010

dbus.String(value, variant_level=1))

1011

1283

1012

1284

# Created - property

1013

1285

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

1014

1286

def Created_dbus_property(self):

1015

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

1287

return datetime_to_dbus(self.created)

1016

1288

1017

1289

# LastEnabled - property

1018

1290

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

1019

1291

def LastEnabled_dbus_property(self):

1020

if self.last_enabled is None:

1021

return dbus.String("")

1022

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

1292

return datetime_to_dbus(self.last_enabled)

1023

1293

1024

1294

# Enabled - property

1025

1295

@dbus_service_property(_interface, signature="b",

1039

1309

if value is not None:

1040

1310

self.checked_ok()

1041

1311

return

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

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)

1046

1318

1047

1319

# LastApprovalRequest - property

1048

1320

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

1049

1321

def LastApprovalRequest_dbus_property(self):

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))

1322

return datetime_to_dbus(self.last_approval_request)

1055

1323

1056

1324

# Timeout - property

1057

1325

@dbus_service_property(_interface, signature="t",

1060

1328

if value is None: # get

1061

1329

return dbus.UInt64(self.timeout_milliseconds())

1062

1330

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))

1066

1331

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

1067

1332

return

1068

1333

# Reschedule timeout

1069

1334

gobject.source_remove(self.disable_initiator_tag)

1070

1335

self.disable_initiator_tag = None

1071

time_to_die = (self.

1072

_timedelta_to_milliseconds((self

1073

.last_checked_ok

1074

+ self.timeout)

1075

- datetime.datetime

1076

.utcnow()))

1336

self.expires = None

1337

time_to_die = _timedelta_to_milliseconds((self

1338

.last_checked_ok

1339

+ self.timeout)

1340

- datetime.datetime

1341

.utcnow())

1077

1342

if time_to_die <= 0:

1078

1343

# The timeout has passed

1079

1344

self.disable()

1080

1345

else:

1346

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

1347

+ datetime.timedelta(milliseconds =

1348

time_to_die))

1081

1349

self.disable_initiator_tag = (gobject.timeout_add

1082

1350

(time_to_die, self.disable))

1083

1351

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

1084

1360

# Interval - property

1085

1361

@dbus_service_property(_interface, signature="t",

1086

1362

access="readwrite")

1088

1364

if value is None: # get

1089

1365

return dbus.UInt64(self.interval_milliseconds())

1090

1366

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))

1094

1367

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

1095

1368

return

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

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

1102

1376

# Checker - property

1103

1377

@dbus_service_property(_interface, signature="s",

1104

1378

access="readwrite")

1106

1380

if value is None: # get

1107

1381

return dbus.String(self.checker_command)

1108

1382

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))

1113

1383

1114

1384

# CheckerRunning - property

1115

1385

@dbus_service_property(_interface, signature="b",

1142

1412

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

1143

1413

if not self._pipe.recv():

1144

1414

raise KeyError()

1145

1415

1146

1416

def __getattribute__(self, name):

1147

1417

if(name == '_pipe'):

1148

1418

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

1155

1425

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

1156

1426

return self._pipe.recv()[1]

1157

1427

return func

1158

1428

1159

1429

def __setattr__(self, name, value):

1160

1430

if(name == '_pipe'):

1161

1431

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

1162

1432

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

1163

1433

1164

1434

1435

class ClientDBusTransitional(ClientDBus):

1436

__metaclass__ = AlternateDBusNamesMetaclass

1437

1438

1165

1439

class ClientHandler(socketserver.BaseRequestHandler, object):

1166

1440

"""A class to handle client connections.

1167

1441

1174

1448

unicode(self.client_address))

1175

1449

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

1176

1450

self.server.child_pipe.fileno())

1177

1451

1178

1452

session = (gnutls.connection

1179

1453

.ClientSession(self.request,

1180

1454

gnutls.connection

1181

1455

.X509Credentials()))

1182

1456

1183

1457

# Note: gnutls.connection.X509Credentials is really a

1184

1458

# generic GnuTLS certificate credentials object so long as

1185

1459

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

1186

1460

# here despite using OpenPGP certificates.

1187

1461

1188

1462

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

1189

1463

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

1190

1464

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

1196

1470

(gnutls.library.functions

1197

1471

.gnutls_priority_set_direct(session._c_object,

1198

1472

priority, None))

1199

1473

1200

1474

# Start communication using the Mandos protocol

1201

1475

# Get protocol number

1202

1476

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

1204

1478

try:

1205

1479

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

1206

1480

raise RuntimeError

1207

except (ValueError, IndexError, RuntimeError), error:

1481

except (ValueError, IndexError, RuntimeError) as error:

1208

1482

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

1209

1483

return

1210

1484

1211

1485

# Start GnuTLS connection

1212

1486

try:

1213

1487

session.handshake()

1214

except gnutls.errors.GNUTLSError, error:

1488

except gnutls.errors.GNUTLSError as error:

1215

1489

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

1216

1490

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

1217

1491

# established. Just abandon the request.

1218

1492

return

1219

1493

logger.debug("Handshake succeeded")

1220

1494

1221

1495

approval_required = False

1222

1496

try:

1223

1497

try:

1224

1498

fpr = self.fingerprint(self.peer_certificate

1225

1499

(session))

1226

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

1500

except (TypeError,

1501

gnutls.errors.GNUTLSError) as error:

1227

1502

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

1228

1503

return

1229

1504

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

1230

1505

if self.server.use_dbus:

1506

# Emit D-Bus signal

1507

client.NewRequest(str(self.client_address))

1508

1231

1509

try:

1232

1510

client = ProxyClient(child_pipe, fpr,

1233

1511

self.client_address)

1241

1519

1242

1520

while True:

1243

1521

if not client.enabled:

1244

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

1522

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

1245

1523

client.name)

1246

1524

if self.server.use_dbus:

1247

1525

# Emit D-Bus signal

1248

client.Rejected("Disabled")

1526

client.Rejected("Disabled")

1249

1527

return

1250

1528

1251

1529

if client._approved or not client.approval_delay:

1268

1546

return

1269

1547

1270

1548

#wait until timeout or approved

1271

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

1272

1549

time = datetime.datetime.now()

1273

1550

client.changedstate.acquire()

1274

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

1551

(client.changedstate.wait

1552

(float(client._timedelta_to_milliseconds(delay)

1553

/ 1000)))

1275

1554

client.changedstate.release()

1276

1555

time2 = datetime.datetime.now()

1277

1556

if (time2 - time) >= delay:

1292

1571

while sent_size < len(client.secret):

1293

1572

try:

1294

1573

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

1295

except (gnutls.errors.GNUTLSError), error:

1574

except gnutls.errors.GNUTLSError as error:

1296

1575

logger.warning("gnutls send failed")

1297

1576

return

1298

1577

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

1299

1578

sent, len(client.secret)

1300

1579

- (sent_size + sent))

1301

1580

sent_size += sent

1302

1581

1303

1582

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

1304

# bump the timeout as if seen

1305

client.checked_ok()

1583

# bump the timeout using extended_timeout

1584

client.checked_ok(client.extended_timeout)

1306

1585

if self.server.use_dbus:

1307

1586

# Emit D-Bus signal

1308

1587

client.GotSecret()

1312

1591

client.approvals_pending -= 1

1313

1592

try:

1314

1593

session.bye()

1315

except (gnutls.errors.GNUTLSError), error:

1594

except gnutls.errors.GNUTLSError as error:

1316

1595

logger.warning("GnuTLS bye failed")

1317

1596

1318

1597

@staticmethod

1375

1654

# Convert the buffer to a Python bytestring

1376

1655

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

1377

1656

# Convert the bytestring to hexadecimal notation

1378

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

1657

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

1379

1658

return hex_fpr

1380

1659

1381

1660

1387

1666

except:

1388

1667

self.handle_error(request, address)

1389

1668

self.close_request(request)

1390

1669

1391

1670

def process_request(self, request, address):

1392

1671

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

1393

multiprocessing.Process(target = self.sub_process_main,

1394

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

1672

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

1673

args = (request,

1674

address))

1675

proc.start()

1676

return proc

1677

1395

1678

1396

1679

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1397

1680

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

1401

1684

This function creates a new pipe in self.pipe

1402

1685

"""

1403

1686

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1404

1405

super(MultiprocessingMixInWithPipe,

1406

self).process_request(request, client_address)

1687

1688

proc = MultiprocessingMixIn.process_request(self, request,

1689

client_address)

1407

1690

self.child_pipe.close()

1408

self.add_pipe(parent_pipe)

1409

1410

def add_pipe(self, parent_pipe):

1691

self.add_pipe(parent_pipe, proc)

1692

1693

def add_pipe(self, parent_pipe, proc):

1411

1694

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

1412

1695

raise NotImplementedError

1413

1696

1697

1414

1698

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1415

1699

socketserver.TCPServer, object):

1416

1700

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

1442

1726

SO_BINDTODEVICE,

1443

1727

str(self.interface

1444

1728

+ '\0'))

1445

except socket.error, error:

1729

except socket.error as error:

1446

1730

if error[0] == errno.EPERM:

1447

1731

logger.error("No permission to"

1448

1732

" bind to interface %s",

1490

1774

self.enabled = False

1491

1775

self.clients = clients

1492

1776

if self.clients is None:

1493

self.clients = set()

1777

self.clients = {}

1494

1778

self.use_dbus = use_dbus

1495

1779

self.gnutls_priority = gnutls_priority

1496

1780

IPv6_TCPServer.__init__(self, server_address,

1500

1784

def server_activate(self):

1501

1785

if self.enabled:

1502

1786

return socketserver.TCPServer.server_activate(self)

1787

1503

1788

def enable(self):

1504

1789

self.enabled = True

1505

def add_pipe(self, parent_pipe):

1790

1791

def add_pipe(self, parent_pipe, proc):

1506

1792

# Call "handle_ipc" for both data and EOF events

1507

1793

gobject.io_add_watch(parent_pipe.fileno(),

1508

1794

gobject.IO_IN | gobject.IO_HUP,

1509

1795

functools.partial(self.handle_ipc,

1510

parent_pipe = parent_pipe))

1511

1796

parent_pipe =

1797

parent_pipe,

1798

proc = proc))

1799

1512

1800

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

1513

client_object=None):

1801

proc = None, client_object=None):

1514

1802

condition_names = {

1515

1803

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

1516

1804

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

1525

1813

for cond, name in

1526

1814

condition_names.iteritems()

1527

1815

if cond & condition)

1528

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

1816

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

1529

1817

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

1818

# Wait for other process to exit

1819

proc.join()

1530

1820

return False

1531

1821

1532

1822

# Read a request from the child

1537

1827

fpr = request[1]

1538

1828

address = request[2]

1539

1829

1540

for c in self.clients:

1830

for c in self.clients.itervalues():

1541

1831

if c.fingerprint == fpr:

1542

1832

client = c

1543

1833

break

1544

1834

else:

1545

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

1546

"dress: %s", fpr, address)

1835

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

1836

"dress: %s", fpr, address)

1547

1837

if self.use_dbus:

1548

1838

# Emit D-Bus signal

1549

mandos_dbus_service.ClientNotFound(fpr, address[0])

1839

mandos_dbus_service.ClientNotFound(fpr,

1840

address[0])

1550

1841

parent_pipe.send(False)

1551

1842

return False

1552

1843

1553

1844

gobject.io_add_watch(parent_pipe.fileno(),

1554

1845

gobject.IO_IN | gobject.IO_HUP,

1555

1846

functools.partial(self.handle_ipc,

1556

parent_pipe = parent_pipe,

1557

client_object = client))

1847

parent_pipe =

1848

parent_pipe,

1849

proc = proc,

1850

client_object =

1851

client))

1558

1852

parent_pipe.send(True)

1559

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

1853

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

1854

# same fileno

1560

1855

return False

1561

1856

if command == 'funcall':

1562

1857

funcname = request[1]

1563

1858

args = request[2]

1564

1859

kwargs = request[3]

1565

1860

1566

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

1567

1861

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

1862

funcname)(*args,

1863

**kwargs)))

1864

1568

1865

if command == 'getattr':

1569

1866

attrname = request[1]

1570

1867

if callable(client_object.__getattribute__(attrname)):

1571

1868

parent_pipe.send(('function',))

1572

1869

else:

1573

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

1870

parent_pipe.send(('data', client_object

1871

.__getattribute__(attrname)))

1574

1872

1575

1873

if command == 'setattr':

1576

1874

attrname = request[1]

1577

1875

value = request[2]

1578

1876

setattr(client_object, attrname, value)

1579

1877

1580

1878

return True

1581

1879

1582

1880

1613

1911

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

1614

1912

else:

1615

1913

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

1616

except (ValueError, IndexError), e:

1914

except (ValueError, IndexError) as e:

1617

1915

raise ValueError(*(e.args))

1618

1916

timevalue += delta

1619

1917

return timevalue

1620

1918

1621

1919

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

1646

1920

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

1647

1921

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

1648

1922

1673

1947

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

1674

1948

# Parsing of options, both command line and config file

1675

1949

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]

1950

parser = argparse.ArgumentParser()

1951

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

1952

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

1953

help="show version number and exit")

1954

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

1955

help="Bind to interface IF")

1956

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

1957

help="Address to listen for requests on")

1958

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

1959

help="Port number to receive requests on")

1960

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

1961

help="Run self-test")

1962

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

1963

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

1964

" to terminal")

1965

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

1966

help="Debug level for stdout output")

1967

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

1968

" priority string (see GnuTLS documentation)")

1969

parser.add_argument("--servicename",

1970

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

1971

parser.add_argument("--configdir",

1972

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

1973

help="Directory to search for configuration"

1974

" files")

1975

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

1976

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

1977

" system bus interface")

1978

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

1979

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

1980

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

1981

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

1982

" state")

1983

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

1984

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

1985

1986

options = parser.parse_args()

1704

1987

1705

1988

if options.check:

1706

1989

import doctest

1718

2001

"use_dbus": "True",

1719

2002

"use_ipv6": "True",

1720

2003

"debuglevel": "",

2004

"restore": "True",

2005

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

1721

2006

}

1722

2007

1723

2008

# Parse config file for server-global settings

1740

2025

# options, if set.

1741

2026

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

1742

2027

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

1743

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

2028

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

2029

"statedir"):

1744

2030

value = getattr(options, option)

1745

2031

if value is not None:

1746

2032

server_settings[option] = value

1758

2044

debuglevel = server_settings["debuglevel"]

1759

2045

use_dbus = server_settings["use_dbus"]

1760

2046

use_ipv6 = server_settings["use_ipv6"]

1761

2047

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

2048

stored_state_file)

2049

2050

if debug:

2051

initlogger(logging.DEBUG)

2052

else:

2053

if not debuglevel:

2054

initlogger()

2055

else:

2056

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

2057

initlogger(level)

2058

1762

2059

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

1763

2060

syslogger.setFormatter(logging.Formatter

1764

2061

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

1766

2063

% server_settings["servicename"]))

1767

2064

1768

2065

# Parse config file with clients

1769

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

1770

"interval": "5m",

2066

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

2067

"extended_timeout": "15m",

2068

"interval": "2m",

1771

2069

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

1772

2070

"host": "",

1773

2071

"approval_delay": "0s",

1813

2111

try:

1814

2112

os.setgid(gid)

1815

2113

os.setuid(uid)

1816

except OSError, error:

2114

except OSError as error:

1817

2115

if error[0] != errno.EPERM:

1818

2116

raise error

1819

2117

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

1828

2118

if debug:

1829

2119

# Enable all possible GnuTLS debugging

1830

2120

1861

2151

# End of Avahi example code

1862

2152

if use_dbus:

1863

2153

try:

1864

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

2154

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

1865

2155

bus, do_not_queue=True)

1866

except dbus.exceptions.NameExistsException, e:

2156

old_bus_name = (dbus.service.BusName

2157

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

2158

do_not_queue=True))

2159

except dbus.exceptions.NameExistsException as e:

1867

2160

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

1868

2161

use_dbus = False

1869

2162

server_settings["use_dbus"] = False

1870

2163

tcp_server.use_dbus = False

1871

2164

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

1872

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

1873

servicetype = "_mandos._tcp",

1874

protocol = protocol, bus = bus)

2165

service = AvahiServiceToSyslog(name =

2166

server_settings["servicename"],

2167

servicetype = "_mandos._tcp",

2168

protocol = protocol, bus = bus)

1875

2169

if server_settings["interface"]:

1876

2170

service.interface = (if_nametoindex

1877

2171

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

1881

2175

1882

2176

client_class = Client

1883

2177

if use_dbus:

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):

2178

client_class = functools.partial(ClientDBusTransitional,

2179

bus = bus)

2180

2181

special_settings = {

2182

# Some settings need to be accessd by special methods;

2183

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

2184

"approved_by_default":

2185

lambda section:

2186

client_config.getboolean(section, "approved_by_default"),

2187

"enabled":

2188

lambda section:

2189

client_config.getboolean(section, "enabled"),

2190

}

2191

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

2192

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

2193

# with exceptions for any special settings as defined above

2194

client_settings = dict((clientname,

2195

dict((setting,

2196

(value

2197

if setting not in special_settings

2198

else special_settings[setting]

2199

(clientname)))

2200

for setting, value in

2201

client_config.items(clientname)))

2202

for clientname in client_config.sections())

2203

2204

old_client_settings = {}

2205

clients_data = []

2206

2207

# Get client data and settings from last running state.

2208

if server_settings["restore"]:

2209

try:

2210

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

2211

clients_data, old_client_settings = (pickle.load

2212

(stored_state))

2213

os.remove(stored_state_path)

2214

except IOError as e:

2215

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

2216

.format(e))

2217

if e.errno != errno.ENOENT:

2218

raise

2219

2220

with Crypto() as crypt:

2221

for client in clients_data:

2222

client_name = client["name"]

2223

2224

# Decide which value to use after restoring saved state.

2225

# We have three different values: Old config file,

2226

# new config file, and saved state.

2227

# New config value takes precedence if it differs from old

2228

# config value, otherwise use saved state.

2229

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

2230

try:

2231

# For each value in new config, check if it

2232

# differs from the old config value (Except for

2233

# the "secret" attribute)

2234

if (name != "secret" and

2235

value != old_client_settings[client_name]

2236

[name]):

2237

setattr(client, name, value)

2238

except KeyError:

2239

pass

2240

2241

# Clients who has passed its expire date can still be

2242

# enabled if its last checker was sucessful. Clients

2243

# whose checker failed before we stored its state is

2244

# assumed to have failed all checkers during downtime.

2245

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

2246

if ((datetime.datetime.utcnow()

2247

- client["last_checked_ok"])

2248

> client["interval"]):

2249

if client["last_checker_status"] != 0:

2250

client["enabled"] = False

2251

else:

2252

client["expires"] = (datetime.datetime

2253

.utcnow()

2254

+ client["timeout"])

2255

2256

client["changedstate"] = (multiprocessing_manager

2257

.Condition

2258

(multiprocessing_manager

2259

.Lock()))

2260

if use_dbus:

2261

new_client = (ClientDBusTransitional.__new__

2262

(ClientDBusTransitional))

2263

tcp_server.clients[client_name] = new_client

2264

new_client.bus = bus

2265

for name, value in client.iteritems():

2266

setattr(new_client, name, value)

2267

client_object_name = unicode(client_name).translate(

2268

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

2269

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

2270

new_client.dbus_object_path = (dbus.ObjectPath

2271

("/clients/"

2272

+ client_object_name))

2273

DBusObjectWithProperties.__init__(new_client,

2274

new_client.bus,

2275

new_client

2276

.dbus_object_path)

2277

else:

2278

tcp_server.clients[client_name] = (Client.__new__

2279

(Client))

2280

for name, value in client.iteritems():

2281

setattr(tcp_server.clients[client_name],

2282

name, value)

2283

1892

2284

try:

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()))

2285

tcp_server.clients[client_name].secret = (

2286

crypt.decrypt(tcp_server.clients[client_name]

2287

.encrypted_secret,

2288

client_settings[client_name]

2289

["secret"]))

2290

except CryptoError:

2291

# If decryption fails, we use secret from new settings

2292

tcp_server.clients[client_name].secret = (

2293

client_settings[client_name]["secret"])

2294

2295

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

2296

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

2297

del tcp_server.clients[clientname]

2298

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

2299

tcp_server.clients[clientname] = (client_class(name

2300

= clientname,

2301

config =

2302

client_settings

2303

[clientname]))

2304

1902

2305

if not tcp_server.clients:

1903

2306

logger.warning("No clients defined")

1904

2307

1917

2320

del pidfilename

1918

2321

1919

2322

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

1920

2323

1921

2324

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

1922

2325

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

1923

2326

1926

2329

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

1927

2330

def __init__(self):

1928

2331

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

1929

_interface = "se.bsnet.fukt.Mandos"

2332

_interface = "se.recompile.Mandos"

1930

2333

1931

2334

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

1932

2335

def ClientAdded(self, objpath):

1947

2350

def GetAllClients(self):

1948

2351

"D-Bus method"

1949

2352

return dbus.Array(c.dbus_object_path

1950

for c in tcp_server.clients)

2353

for c in

2354

tcp_server.clients.itervalues())

1951

2355

1952

2356

@dbus.service.method(_interface,

1953

2357

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

1955

2359

"D-Bus method"

1956

2360

return dbus.Dictionary(

1957

2361

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

1958

for c in tcp_server.clients),

2362

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

1959

2363

signature="oa{sv}")

1960

2364

1961

2365

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

1962

2366

def RemoveClient(self, object_path):

1963

2367

"D-Bus method"

1964

for c in tcp_server.clients:

2368

for c in tcp_server.clients.itervalues():

1965

2369

if c.dbus_object_path == object_path:

1966

tcp_server.clients.remove(c)

2370

del tcp_server.clients[c.name]

1967

2371

c.remove_from_connection()

1968

2372

# Don't signal anything except ClientRemoved

1969

2373

c.disable(quiet=True)

1974

2378

1975

2379

del _interface

1976

2380

1977

mandos_dbus_service = MandosDBusService()

2381

class MandosDBusServiceTransitional(MandosDBusService):

2382

__metaclass__ = AlternateDBusNamesMetaclass

2383

mandos_dbus_service = MandosDBusServiceTransitional()

1978

2384

1979

2385

def cleanup():

1980

2386

"Cleanup function; run on exit"

1981

2387

service.cleanup()

1982

2388

2389

multiprocessing.active_children()

2390

if not (tcp_server.clients or client_settings):

2391

return

2392

2393

# Store client before exiting. Secrets are encrypted with key

2394

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

2395

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

2396

clients = []

2397

with Crypto() as crypt:

2398

for client in tcp_server.clients.itervalues():

2399

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

2400

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

2401

key)

2402

client_dict = {}

2403

2404

# A list of attributes that will not be stored when

2405

# shutting down.

2406

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

2407

for name, typ in (inspect.getmembers

2408

(dbus.service.Object)):

2409

exclude.add(name)

2410

2411

client_dict["encrypted_secret"] = (client

2412

.encrypted_secret)

2413

for attr in client.client_structure:

2414

if attr not in exclude:

2415

client_dict[attr] = getattr(client, attr)

2416

2417

clients.append(client_dict)

2418

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

2419

2420

try:

2421

with os.fdopen(os.open(stored_state_path,

2422

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

2423

0600), "wb") as stored_state:

2424

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

2425

except (IOError, OSError) as e:

2426

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

2427

.format(e))

2428

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

2429

raise

2430

2431

# Delete all clients, and settings from config

1983

2432

while tcp_server.clients:

1984

client = tcp_server.clients.pop()

2433

name, client = tcp_server.clients.popitem()

1985

2434

if use_dbus:

1986

2435

client.remove_from_connection()

1987

client.disable_hook = None

1988

2436

# Don't signal anything except ClientRemoved

1989

2437

client.disable(quiet=True)

1990

2438

if use_dbus:

1991

2439

# Emit D-Bus signal

1992

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2440

mandos_dbus_service.ClientRemoved(client

2441

.dbus_object_path,

1993

2442

client.name)

2443

client_settings.clear()

1994

2444

1995

2445

atexit.register(cleanup)

1996

2446

1997

for client in tcp_server.clients:

2447

for client in tcp_server.clients.itervalues():

1998

2448

if use_dbus:

1999

2449

# Emit D-Bus signal

2000

2450

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2001

client.enable()

2451

# Need to initiate checking of clients

2452

if client.enabled:

2453

client.init_checker()

2002

2454

2003

2455

tcp_server.enable()

2004

2456

tcp_server.server_activate()

2019

2471

# From the Avahi example code

2020

2472

try:

2021

2473

service.activate()

2022

except dbus.exceptions.DBusException, error:

2474

except dbus.exceptions.DBusException as error:

2023

2475

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

2024

2476

cleanup()

2025

2477

sys.exit(1)

2032

2484

2033

2485

logger.debug("Starting main loop")

2034

2486

main_loop.run()

2035

except AvahiError, error:

2487

except AvahiError as error:

2036

2488

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

2037

2489

cleanup()

2038

2490

sys.exit(1)

2044

2496

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

2045

2497

cleanup()

2046

2498

2499

2047

2500

if __name__ == '__main__':

2048

2501

main()