/mandos/release : revision 282

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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 PGPError(Exception):

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

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pass

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class PGPEngine(object):

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

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def __init__(self):

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self.gnupg = GnuPGInterface.GnuPG()

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

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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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

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'--quiet'])

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def __enter__(self):

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return self

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

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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

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topdown = False):

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for filename in files:

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

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for dirname in dirs:

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

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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

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

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

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def encrypt(self, data, password):

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

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with open(os.devnull) as devnull:

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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ciphertext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return ciphertext

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def decrypt(self, data, password):

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

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with open(os.devnull) as devnull:

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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decrypted_plaintext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return decrypted_plaintext

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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class AvahiError(Exception):

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

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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

424

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until this client is disabled

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extended_timeout: extra long timeout when password has been sent

426

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runtime_expansions: Allowed attributes for runtime expansion.

427

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

428

disabled, or None

429

274

"""

430

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431

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runtime_expansions = ("approval_delay", "approval_duration",

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

434

279

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

435

280

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

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def timeout_milliseconds(self):

437

289

"Return the 'timeout' attribute in milliseconds"

438

return timedelta_to_milliseconds(self.timeout)

439

440

def extended_timeout_milliseconds(self):

441

"Return the 'extended_timeout' attribute in milliseconds"

442

return timedelta_to_milliseconds(self.extended_timeout)

290

return self._timedelta_to_milliseconds(self.timeout)

443

291

444

292

def interval_milliseconds(self):

445

293

"Return the 'interval' attribute in milliseconds"

446

return timedelta_to_milliseconds(self.interval)

447

294

return self._timedelta_to_milliseconds(self.interval)

295

448

296

def approval_delay_milliseconds(self):

449

return timedelta_to_milliseconds(self.approval_delay)

297

return self._timedelta_to_milliseconds(self.approval_delay)

450

298

451

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

299

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

452

300

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

453

301

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

454

302

attribute."""

474

322

% self.name)

475

323

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

476

324

self.created = datetime.datetime.utcnow()

477

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

325

self.enabled = False

478

326

self.last_approval_request = None

479

if self.enabled:

480

self.last_enabled = datetime.datetime.utcnow()

481

else:

482

self.last_enabled = None

327

self.last_enabled = None

483

328

self.last_checked_ok = None

484

self.last_checker_status = None

485

329

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

486

self.extended_timeout = string_to_delta(config

487

["extended_timeout"])

488

330

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

331

self.disable_hook = disable_hook

489

332

self.checker = None

490

333

self.checker_initiator_tag = None

491

334

self.disable_initiator_tag = None

492

if self.enabled:

493

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

494

else:

495

self.expires = None

496

335

self.checker_callback_tag = None

497

336

self.checker_command = config["checker"]

498

337

self.current_checker_command = None

499

self.approved = None

338

self.last_connect = None

339

self._approved = None

500

340

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

501

341

True)

502

342

self.approvals_pending = 0

504

344

config["approval_delay"])

505

345

self.approval_duration = string_to_delta(

506

346

config["approval_duration"])

507

self.changedstate = (multiprocessing_manager

508

.Condition(multiprocessing_manager

509

.Lock()))

510

self.client_structure = [attr for attr in

511

self.__dict__.iterkeys()

512

if not attr.startswith("_")]

513

self.client_structure.append("client_structure")

514

515

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

516

lambda obj:

517

isinstance(obj,

518

property)):

519

if not name.startswith("_"):

520

self.client_structure.append(name)

347

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

521

348

522

# Send notice to process children that client state has changed

523

349

def send_changedstate(self):

524

with self.changedstate:

525

self.changedstate.notify_all()

526

350

self.changedstate.acquire()

351

self.changedstate.notify_all()

352

self.changedstate.release()

353

527

354

def enable(self):

528

355

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

529

356

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

530

357

# Already enabled

531

358

return

532

359

self.send_changedstate()

533

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

534

self.enabled = True

535

360

self.last_enabled = datetime.datetime.utcnow()

536

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()

537

373

538

374

def disable(self, quiet=True):

539

375

"""Disable this client."""

546

382

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

547

383

gobject.source_remove(self.disable_initiator_tag)

548

384

self.disable_initiator_tag = None

549

self.expires = None

550

385

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

551

386

gobject.source_remove(self.checker_initiator_tag)

552

387

self.checker_initiator_tag = None

553

388

self.stop_checker()

389

if self.disable_hook:

390

self.disable_hook(self)

554

391

self.enabled = False

555

392

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

556

393

return False

557

394

558

395

def __del__(self):

396

self.disable_hook = None

559

397

self.disable()

560

398

561

def init_checker(self):

562

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

563

# and every interval from then on.

564

self.checker_initiator_tag = (gobject.timeout_add

565

(self.interval_milliseconds(),

566

self.start_checker))

567

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

568

self.disable_initiator_tag = (gobject.timeout_add

569

(self.timeout_milliseconds(),

570

self.disable))

571

# Also start a new checker *right now*.

572

self.start_checker()

573

574

399

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

575

400

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

576

401

self.checker_callback_tag = None

577

402

self.checker = None

578

403

if os.WIFEXITED(condition):

579

self.last_checker_status = os.WEXITSTATUS(condition)

580

if self.last_checker_status == 0:

404

exitstatus = os.WEXITSTATUS(condition)

405

if exitstatus == 0:

581

406

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

582

407

vars(self))

583

408

self.checked_ok()

585

410

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

586

411

vars(self))

587

412

else:

588

self.last_checker_status = -1

589

413

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

590

414

vars(self))

591

415

592

def checked_ok(self, timeout=None):

416

def checked_ok(self):

593

417

"""Bump up the timeout for this client.

594

418

595

419

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

596

420

alive and well.

597

421

"""

598

if timeout is None:

599

timeout = self.timeout

600

422

self.last_checked_ok = datetime.datetime.utcnow()

601

if self.disable_initiator_tag is not None:

602

gobject.source_remove(self.disable_initiator_tag)

603

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

604

self.disable_initiator_tag = (gobject.timeout_add

605

(timedelta_to_milliseconds

606

(timeout), self.disable))

607

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))

608

427

609

428

def need_approval(self):

610

429

self.last_approval_request = datetime.datetime.utcnow()

626

445

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

627

446

try:

628

447

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

629

except (AttributeError, OSError) as error:

448

except (AttributeError, OSError), error:

630

449

if (isinstance(error, OSError)

631

450

and error.errno != errno.ECHILD):

632

451

raise error

650

469

'replace')))

651

470

for attr in

652

471

self.runtime_expansions)

653

472

654

473

try:

655

474

command = self.checker_command % escaped_attrs

656

except TypeError as error:

475

except TypeError, error:

657

476

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

658

477

' %s', self.checker_command, error)

659

478

return True # Try again later

678

497

if pid:

679

498

gobject.source_remove(self.checker_callback_tag)

680

499

self.checker_callback(pid, status, command)

681

except OSError as error:

500

except OSError, error:

682

501

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

683

502

error)

684

503

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

697

516

#time.sleep(0.5)

698

517

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

699

518

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

700

except OSError as error:

519

except OSError, error:

701

520

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

702

521

raise

703

522

self.checker = None

704

523

705

706

524

def dbus_service_property(dbus_interface, signature="v",

707

525

access="readwrite", byte_arrays=False):

708

526

"""Decorators for marking methods of a DBusObjectWithProperties to

754

572

755

573

class DBusObjectWithProperties(dbus.service.Object):

756

574

"""A D-Bus object with properties.

757

575

758

576

Classes inheriting from this can use the dbus_service_property

759

577

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

760

578

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

767

585

def _get_all_dbus_properties(self):

768

586

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

769

587

"""

770

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

771

for cls in self.__class__.__mro__

588

return ((prop._dbus_name, prop)

772

589

for name, prop in

773

inspect.getmembers(cls, self._is_dbus_property))

590

inspect.getmembers(self, self._is_dbus_property))

774

591

775

592

def _get_dbus_property(self, interface_name, property_name):

776

593

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

777

594

property with the specified name and interface.

778

595

"""

779

for cls in self.__class__.__mro__:

780

for name, value in (inspect.getmembers

781

(cls, self._is_dbus_property)):

782

if (value._dbus_name == property_name

783

and value._dbus_interface == interface_name):

784

return value.__get__(self)

785

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

786

606

# No such property

787

607

raise DBusPropertyNotFound(self.dbus_object_path + ":"

788

608

+ interface_name + "."

822

642

def GetAll(self, interface_name):

823

643

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

824

644

standard.

825

645

826

646

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

827

647

"""

828

properties = {}

648

all = {}

829

649

for name, prop in self._get_all_dbus_properties():

830

650

if (interface_name

831

651

and interface_name != prop._dbus_interface):

836

656

continue

837

657

value = prop()

838

658

if not hasattr(value, "variant_level"):

839

properties[name] = value

659

all[name] = value

840

660

continue

841

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

842

value.variant_level+1)

843

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")

844

664

845

665

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

846

666

out_signature="s",

884

704

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

885

705

document.unlink()

886

706

except (AttributeError, xml.dom.DOMException,

887

xml.parsers.expat.ExpatError) as error:

707

xml.parsers.expat.ExpatError), error:

888

708

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

889

709

error)

890

710

return xmlstring

891

711

892

712

893

def datetime_to_dbus (dt, variant_level=0):

894

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

895

if dt is None:

896

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

897

return dbus.String(dt.isoformat(),

898

variant_level=variant_level)

899

900

901

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

902

.__metaclass__):

903

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

904

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

905

"""

906

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

907

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

908

# methods, signals, or properties in them

909

for base in (b for b in bases

910

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

911

# Go though all attributes of the base class

912

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

913

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

914

# with the wrong interface name

915

if (not hasattr(attribute, "_dbus_interface")

916

or not attribute._dbus_interface

917

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

918

continue

919

# Create an alternate D-Bus interface name based on

920

# the current name

921

alt_interface = (attribute._dbus_interface

922

.replace("se.recompile.Mandos",

923

"se.bsnet.fukt.Mandos"))

924

# Is this a D-Bus signal?

925

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

926

# Extract the original non-method function by

927

# black magic

928

nonmethod_func = (dict(

929

zip(attribute.func_code.co_freevars,

930

attribute.__closure__))["func"]

931

.cell_contents)

932

# Create a new, but exactly alike, function

933

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

934

# with the alternate D-Bus interface name

935

new_function = (dbus.service.signal

936

(alt_interface,

937

attribute._dbus_signature)

938

(types.FunctionType(

939

nonmethod_func.func_code,

940

nonmethod_func.func_globals,

941

nonmethod_func.func_name,

942

nonmethod_func.func_defaults,

943

nonmethod_func.func_closure)))

944

# Define a creator of a function to call both the

945

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

946

# signals gets sent when the function is called

947

def fixscope(func1, func2):

948

"""This function is a scope container to pass

949

func1 and func2 to the "call_both" function

950

outside of its arguments"""

951

def call_both(*args, **kwargs):

952

"""This function will emit two D-Bus

953

signals by calling func1 and func2"""

954

func1(*args, **kwargs)

955

func2(*args, **kwargs)

956

return call_both

957

# Create the "call_both" function and add it to

958

# the class

959

attr[attrname] = fixscope(attribute,

960

new_function)

961

# Is this a D-Bus method?

962

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

963

# Create a new, but exactly alike, function

964

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

965

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

966

# to the class.

967

attr[attrname] = (dbus.service.method

968

(alt_interface,

969

attribute._dbus_in_signature,

970

attribute._dbus_out_signature)

971

(types.FunctionType

972

(attribute.func_code,

973

attribute.func_globals,

974

attribute.func_name,

975

attribute.func_defaults,

976

attribute.func_closure)))

977

# Is this a D-Bus property?

978

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

979

# Create a new, but exactly alike, function

980

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

981

# property with the alternate D-Bus interface

982

# name. Add it to the class.

983

attr[attrname] = (dbus_service_property

984

(alt_interface,

985

attribute._dbus_signature,

986

attribute._dbus_access,

987

attribute

988

._dbus_get_args_options

989

["byte_arrays"])

990

(types.FunctionType

991

(attribute.func_code,

992

attribute.func_globals,

993

attribute.func_name,

994

attribute.func_defaults,

995

attribute.func_closure)))

996

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

997

998

999

713

class ClientDBus(Client, DBusObjectWithProperties):

1000

714

"""A Client class using D-Bus

1001

715

1010

724

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

1011

725

1012

726

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

727

self._approvals_pending = 0

1013

728

self.bus = bus

1014

729

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

1015

1016

self._approvals_pending = 0

1017

730

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

1018

731

# the D-Bus

1019

732

client_object_name = unicode(self.name).translate(

1024

737

DBusObjectWithProperties.__init__(self, self.bus,

1025

738

self.dbus_object_path)

1026

739

1027

def notifychangeproperty(transform_func,

1028

dbus_name, type_func=lambda x: x,

1029

variant_level=1):

1030

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

1031

its changes to DBus.

1032

1033

transform_fun: Function that takes a value and a variant_level

1034

and transforms it to a D-Bus type.

1035

dbus_name: D-Bus name of the variable

1036

type_func: Function that transform the value before sending it

1037

to the D-Bus. Default: no transform

1038

variant_level: D-Bus variant level. Default: 1

1039

"""

1040

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

1041

def setter(self, value):

1042

if hasattr(self, "dbus_object_path"):

1043

if (not hasattr(self, attrname) or

1044

type_func(getattr(self, attrname, None))

1045

!= type_func(value)):

1046

dbus_value = transform_func(type_func(value),

1047

variant_level

1048

=variant_level)

1049

self.PropertyChanged(dbus.String(dbus_name),

1050

dbus_value)

1051

setattr(self, attrname, value)

1052

1053

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

1054

1055

1056

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1057

approvals_pending = notifychangeproperty(dbus.Boolean,

1058

"ApprovalPending",

1059

type_func = bool)

1060

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

1061

last_enabled = notifychangeproperty(datetime_to_dbus,

1062

"LastEnabled")

1063

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

1064

type_func = lambda checker:

1065

checker is not None)

1066

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1067

"LastCheckedOK")

1068

last_approval_request = notifychangeproperty(

1069

datetime_to_dbus, "LastApprovalRequest")

1070

approved_by_default = notifychangeproperty(dbus.Boolean,

1071

"ApprovedByDefault")

1072

approval_delay = notifychangeproperty(dbus.UInt64,

1073

"ApprovalDelay",

1074

type_func =

1075

timedelta_to_milliseconds)

1076

approval_duration = notifychangeproperty(

1077

dbus.UInt64, "ApprovalDuration",

1078

type_func = timedelta_to_milliseconds)

1079

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

1080

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

1081

type_func =

1082

timedelta_to_milliseconds)

1083

extended_timeout = notifychangeproperty(

1084

dbus.UInt64, "ExtendedTimeout",

1085

type_func = timedelta_to_milliseconds)

1086

interval = notifychangeproperty(dbus.UInt64,

1087

"Interval",

1088

type_func =

1089

timedelta_to_milliseconds)

1090

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

1091

1092

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

1093

783

1094

784

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

1095

785

try:

1104

794

*args, **kwargs):

1105

795

self.checker_callback_tag = None

1106

796

self.checker = None

797

# Emit D-Bus signal

798

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

799

dbus.Boolean(False, variant_level=1))

1107

800

if os.WIFEXITED(condition):

1108

801

exitstatus = os.WEXITSTATUS(condition)

1109

802

# Emit D-Bus signal

1119

812

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

1120

813

*args, **kwargs)

1121

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

1122

833

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

1123

834

old_checker = self.checker

1124

835

if self.checker is not None:

1131

842

and old_checker_pid != self.checker.pid):

1132

843

# Emit D-Bus signal

1133

844

self.CheckerStarted(self.current_checker_command)

845

self.PropertyChanged(

846

dbus.String("CheckerRunning"),

847

dbus.Boolean(True, variant_level=1))

1134

848

return r

1135

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

1136

859

def _reset_approved(self):

1137

self.approved = None

860

self._approved = None

1138

861

return False

1139

862

1140

863

def approve(self, value=True):

1141

864

self.send_changedstate()

1142

self.approved = value

1143

gobject.timeout_add(timedelta_to_milliseconds

865

self._approved = value

866

gobject.timeout_add(self._timedelta_to_milliseconds

1144

867

(self.approval_duration),

1145

868

self._reset_approved)

1146

869

1147

870

1148

871

## D-Bus methods, signals & properties

1149

_interface = "se.recompile.Mandos.Client"

872

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

1150

873

1151

874

## Signals

1152

875

1189

912

"D-Bus signal"

1190

913

return self.need_approval()

1191

914

1192

# NeRwequest - signal

1193

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

1194

def NewRequest(self, ip):

1195

"""D-Bus signal

1196

Is sent after a client request a password.

1197

"""

1198

pass

1199

1200

915

## Methods

1201

916

1202

917

# Approve - method

1207

922

# CheckedOK - method

1208

923

@dbus.service.method(_interface)

1209

924

def CheckedOK(self):

1210

self.checked_ok()

925

return self.checked_ok()

1211

926

1212

927

# Enable - method

1213

928

@dbus.service.method(_interface)

1246

961

if value is None: # get

1247

962

return dbus.Boolean(self.approved_by_default)

1248

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))

1249

967

1250

968

# ApprovalDelay - property

1251

969

@dbus_service_property(_interface, signature="t",

1254

972

if value is None: # get

1255

973

return dbus.UInt64(self.approval_delay_milliseconds())

1256

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))

1257

978

1258

979

# ApprovalDuration - property

1259

980

@dbus_service_property(_interface, signature="t",

1260

981

access="readwrite")

1261

982

def ApprovalDuration_dbus_property(self, value=None):

1262

983

if value is None: # get

1263

return dbus.UInt64(timedelta_to_milliseconds(

984

return dbus.UInt64(self._timedelta_to_milliseconds(

1264

985

self.approval_duration))

1265

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))

1266

990

1267

991

# Name - property

1268

992

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

1280

1004

def Host_dbus_property(self, value=None):

1281

1005

if value is None: # get

1282

1006

return dbus.String(self.host)

1283

self.host = unicode(value)

1007

self.host = value

1008

# Emit D-Bus signal

1009

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

1010

dbus.String(value, variant_level=1))

1284

1011

1285

1012

# Created - property

1286

1013

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

1287

1014

def Created_dbus_property(self):

1288

return datetime_to_dbus(self.created)

1015

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

1289

1016

1290

1017

# LastEnabled - property

1291

1018

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

1292

1019

def LastEnabled_dbus_property(self):

1293

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))

1294

1023

1295

1024

# Enabled - property

1296

1025

@dbus_service_property(_interface, signature="b",

1310

1039

if value is not None:

1311

1040

self.checked_ok()

1312

1041

return

1313

return datetime_to_dbus(self.last_checked_ok)

1314

1315

# Expires - property

1316

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

1317

def Expires_dbus_property(self):

1318

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))

1319

1046

1320

1047

# LastApprovalRequest - property

1321

1048

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

1322

1049

def LastApprovalRequest_dbus_property(self):

1323

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))

1324

1055

1325

1056

# Timeout - property

1326

1057

@dbus_service_property(_interface, signature="t",

1329

1060

if value is None: # get

1330

1061

return dbus.UInt64(self.timeout_milliseconds())

1331

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))

1332

1066

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

1333

1067

return

1334

1068

# Reschedule timeout

1335

1069

gobject.source_remove(self.disable_initiator_tag)

1336

1070

self.disable_initiator_tag = None

1337

self.expires = None

1338

time_to_die = timedelta_to_milliseconds((self

1339

.last_checked_ok

1340

+ self.timeout)

1341

- datetime.datetime

1342

.utcnow())

1071

time_to_die = (self.

1072

_timedelta_to_milliseconds((self

1073

.last_checked_ok

1074

+ self.timeout)

1075

- datetime.datetime

1076

.utcnow()))

1343

1077

if time_to_die <= 0:

1344

1078

# The timeout has passed

1345

1079

self.disable()

1346

1080

else:

1347

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

1348

+ datetime.timedelta(milliseconds =

1349

time_to_die))

1350

1081

self.disable_initiator_tag = (gobject.timeout_add

1351

1082

(time_to_die, self.disable))

1352

1083

1353

# ExtendedTimeout - property

1354

@dbus_service_property(_interface, signature="t",

1355

access="readwrite")

1356

def ExtendedTimeout_dbus_property(self, value=None):

1357

if value is None: # get

1358

return dbus.UInt64(self.extended_timeout_milliseconds())

1359

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

1360

1361

1084

# Interval - property

1362

1085

@dbus_service_property(_interface, signature="t",

1363

1086

access="readwrite")

1365

1088

if value is None: # get

1366

1089

return dbus.UInt64(self.interval_milliseconds())

1367

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))

1368

1094

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

1369

1095

return

1370

if self.enabled:

1371

# Reschedule checker run

1372

gobject.source_remove(self.checker_initiator_tag)

1373

self.checker_initiator_tag = (gobject.timeout_add

1374

(value, self.start_checker))

1375

self.start_checker() # Start one now, too

1376

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

1377

1102

# Checker - property

1378

1103

@dbus_service_property(_interface, signature="s",

1379

1104

access="readwrite")

1380

1105

def Checker_dbus_property(self, value=None):

1381

1106

if value is None: # get

1382

1107

return dbus.String(self.checker_command)

1383

self.checker_command = unicode(value)

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))

1384

1113

1385

1114

# CheckerRunning - property

1386

1115

@dbus_service_property(_interface, signature="b",

1413

1142

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

1414

1143

if not self._pipe.recv():

1415

1144

raise KeyError()

1416

1145

1417

1146

def __getattribute__(self, name):

1418

if name == '_pipe':

1147

if(name == '_pipe'):

1419

1148

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

1420

1149

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

1421

1150

data = self._pipe.recv()

1426

1155

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

1427

1156

return self._pipe.recv()[1]

1428

1157

return func

1429

1158

1430

1159

def __setattr__(self, name, value):

1431

if name == '_pipe':

1160

if(name == '_pipe'):

1432

1161

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

1433

1162

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

1434

1163

1435

1164

1436

class ClientDBusTransitional(ClientDBus):

1437

__metaclass__ = AlternateDBusNamesMetaclass

1438

1439

1440

1165

class ClientHandler(socketserver.BaseRequestHandler, object):

1441

1166

"""A class to handle client connections.

1442

1167

1449

1174

unicode(self.client_address))

1450

1175

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

1451

1176

self.server.child_pipe.fileno())

1452

1177

1453

1178

session = (gnutls.connection

1454

1179

.ClientSession(self.request,

1455

1180

gnutls.connection

1456

1181

.X509Credentials()))

1457

1182

1458

1183

# Note: gnutls.connection.X509Credentials is really a

1459

1184

# generic GnuTLS certificate credentials object so long as

1460

1185

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

1461

1186

# here despite using OpenPGP certificates.

1462

1187

1463

1188

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

1464

1189

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

1465

1190

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

1471

1196

(gnutls.library.functions

1472

1197

.gnutls_priority_set_direct(session._c_object,

1473

1198

priority, None))

1474

1199

1475

1200

# Start communication using the Mandos protocol

1476

1201

# Get protocol number

1477

1202

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

1479

1204

try:

1480

1205

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

1481

1206

raise RuntimeError

1482

except (ValueError, IndexError, RuntimeError) as error:

1207

except (ValueError, IndexError, RuntimeError), error:

1483

1208

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

1484

1209

return

1485

1210

1486

1211

# Start GnuTLS connection

1487

1212

try:

1488

1213

session.handshake()

1489

except gnutls.errors.GNUTLSError as error:

1214

except gnutls.errors.GNUTLSError, error:

1490

1215

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

1491

1216

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

1492

1217

# established. Just abandon the request.

1493

1218

return

1494

1219

logger.debug("Handshake succeeded")

1495

1220

1496

1221

approval_required = False

1497

1222

try:

1498

1223

try:

1499

1224

fpr = self.fingerprint(self.peer_certificate

1500

1225

(session))

1501

except (TypeError,

1502

gnutls.errors.GNUTLSError) as error:

1226

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

1503

1227

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

1504

1228

return

1505

1229

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

1506

1230

1507

1231

try:

1508

1232

client = ProxyClient(child_pipe, fpr,

1509

1233

self.client_address)

1510

1234

except KeyError:

1511

1235

return

1512

1236

1513

if self.server.use_dbus:

1514

# Emit D-Bus signal

1515

client.NewRequest(str(self.client_address))

1516

1517

1237

if client.approval_delay:

1518

1238

delay = client.approval_delay

1519

1239

client.approvals_pending += 1

1521

1241

1522

1242

while True:

1523

1243

if not client.enabled:

1524

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

1244

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

1525

1245

client.name)

1526

1246

if self.server.use_dbus:

1527

1247

# Emit D-Bus signal

1528

client.Rejected("Disabled")

1248

client.Rejected("Disabled")

1529

1249

return

1530

1250

1531

if client.approved or not client.approval_delay:

1251

if client._approved or not client.approval_delay:

1532

1252

#We are approved or approval is disabled

1533

1253

break

1534

elif client.approved is None:

1254

elif client._approved is None:

1535

1255

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

1536

1256

client.name)

1537

1257

if self.server.use_dbus:

1548

1268

return

1549

1269

1550

1270

#wait until timeout or approved

1271

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

1551

1272

time = datetime.datetime.now()

1552

1273

client.changedstate.acquire()

1553

(client.changedstate.wait

1554

(float(client.timedelta_to_milliseconds(delay)

1555

/ 1000)))

1274

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

1556

1275

client.changedstate.release()

1557

1276

time2 = datetime.datetime.now()

1558

1277

if (time2 - time) >= delay:

1573

1292

while sent_size < len(client.secret):

1574

1293

try:

1575

1294

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

1576

except gnutls.errors.GNUTLSError as error:

1295

except (gnutls.errors.GNUTLSError), error:

1577

1296

logger.warning("gnutls send failed")

1578

1297

return

1579

1298

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

1580

1299

sent, len(client.secret)

1581

1300

- (sent_size + sent))

1582

1301

sent_size += sent

1583

1302

1584

1303

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

1585

# bump the timeout using extended_timeout

1586

client.checked_ok(client.extended_timeout)

1304

# bump the timeout as if seen

1305

client.checked_ok()

1587

1306

if self.server.use_dbus:

1588

1307

# Emit D-Bus signal

1589

1308

client.GotSecret()

1593

1312

client.approvals_pending -= 1

1594

1313

try:

1595

1314

session.bye()

1596

except gnutls.errors.GNUTLSError as error:

1315

except (gnutls.errors.GNUTLSError), error:

1597

1316

logger.warning("GnuTLS bye failed")

1598

1317

1599

1318

@staticmethod

1656

1375

# Convert the buffer to a Python bytestring

1657

1376

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

1658

1377

# Convert the bytestring to hexadecimal notation

1659

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

1378

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

1660

1379

return hex_fpr

1661

1380

1662

1381

1668

1387

except:

1669

1388

self.handle_error(request, address)

1670

1389

self.close_request(request)

1671

1390

1672

1391

def process_request(self, request, address):

1673

1392

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

1674

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

1675

args = (request,

1676

address))

1677

proc.start()

1678

return proc

1679

1393

multiprocessing.Process(target = self.sub_process_main,

1394

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

1680

1395

1681

1396

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1682

1397

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

1686

1401

This function creates a new pipe in self.pipe

1687

1402

"""

1688

1403

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1689

1690

proc = MultiprocessingMixIn.process_request(self, request,

1691

client_address)

1404

1405

super(MultiprocessingMixInWithPipe,

1406

self).process_request(request, client_address)

1692

1407

self.child_pipe.close()

1693

self.add_pipe(parent_pipe, proc)

1694

1695

def add_pipe(self, parent_pipe, proc):

1408

self.add_pipe(parent_pipe)

1409

1410

def add_pipe(self, parent_pipe):

1696

1411

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

1697

1412

raise NotImplementedError

1698

1413

1699

1700

1414

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1701

1415

socketserver.TCPServer, object):

1702

1416

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

1728

1442

SO_BINDTODEVICE,

1729

1443

str(self.interface

1730

1444

+ '\0'))

1731

except socket.error as error:

1445

except socket.error, error:

1732

1446

if error[0] == errno.EPERM:

1733

1447

logger.error("No permission to"

1734

1448

" bind to interface %s",

1776

1490

self.enabled = False

1777

1491

self.clients = clients

1778

1492

if self.clients is None:

1779

self.clients = {}

1493

self.clients = set()

1780

1494

self.use_dbus = use_dbus

1781

1495

self.gnutls_priority = gnutls_priority

1782

1496

IPv6_TCPServer.__init__(self, server_address,

1786

1500

def server_activate(self):

1787

1501

if self.enabled:

1788

1502

return socketserver.TCPServer.server_activate(self)

1789

1790

1503

def enable(self):

1791

1504

self.enabled = True

1792

1793

def add_pipe(self, parent_pipe, proc):

1505

def add_pipe(self, parent_pipe):

1794

1506

# Call "handle_ipc" for both data and EOF events

1795

1507

gobject.io_add_watch(parent_pipe.fileno(),

1796

1508

gobject.IO_IN | gobject.IO_HUP,

1797

1509

functools.partial(self.handle_ipc,

1798

parent_pipe =

1799

parent_pipe,

1800

proc = proc))

1801

1510

parent_pipe = parent_pipe))

1511

1802

1512

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

1803

proc = None, client_object=None):

1513

client_object=None):

1804

1514

condition_names = {

1805

1515

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

1806

1516

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

1815

1525

for cond, name in

1816

1526

condition_names.iteritems()

1817

1527

if cond & condition)

1818

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

1528

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

1819

1529

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

1820

# Wait for other process to exit

1821

proc.join()

1822

1530

return False

1823

1531

1824

1532

# Read a request from the child

1829

1537

fpr = request[1]

1830

1538

address = request[2]

1831

1539

1832

for c in self.clients.itervalues():

1540

for c in self.clients:

1833

1541

if c.fingerprint == fpr:

1834

1542

client = c

1835

1543

break

1836

1544

else:

1837

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

1838

"dress: %s", fpr, address)

1545

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

1546

"dress: %s", fpr, address)

1839

1547

if self.use_dbus:

1840

1548

# Emit D-Bus signal

1841

mandos_dbus_service.ClientNotFound(fpr,

1842

address[0])

1549

mandos_dbus_service.ClientNotFound(fpr, address[0])

1843

1550

parent_pipe.send(False)

1844

1551

return False

1845

1552

1846

1553

gobject.io_add_watch(parent_pipe.fileno(),

1847

1554

gobject.IO_IN | gobject.IO_HUP,

1848

1555

functools.partial(self.handle_ipc,

1849

parent_pipe =

1850

parent_pipe,

1851

proc = proc,

1852

client_object =

1853

client))

1556

parent_pipe = parent_pipe,

1557

client_object = client))

1854

1558

parent_pipe.send(True)

1855

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

1856

# same fileno

1559

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

1857

1560

return False

1858

1561

if command == 'funcall':

1859

1562

funcname = request[1]

1860

1563

args = request[2]

1861

1564

kwargs = request[3]

1862

1565

1863

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

1864

funcname)(*args,

1865

**kwargs)))

1866

1566

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

1567

1867

1568

if command == 'getattr':

1868

1569

attrname = request[1]

1869

1570

if callable(client_object.__getattribute__(attrname)):

1870

1571

parent_pipe.send(('function',))

1871

1572

else:

1872

parent_pipe.send(('data', client_object

1873

.__getattribute__(attrname)))

1573

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

1874

1574

1875

1575

if command == 'setattr':

1876

1576

attrname = request[1]

1877

1577

value = request[2]

1878

1578

setattr(client_object, attrname, value)

1879

1579

1880

1580

return True

1881

1581

1882

1582

1913

1613

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

1914

1614

else:

1915

1615

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

1916

except (ValueError, IndexError) as e:

1616

except (ValueError, IndexError), e:

1917

1617

raise ValueError(*(e.args))

1918

1618

timevalue += delta

1919

1619

return timevalue

1920

1620

1921

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

1922

1646

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

1923

1647

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

1924

1648

1949

1673

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

1950

1674

# Parsing of options, both command line and config file

1951

1675

1952

parser = argparse.ArgumentParser()

1953

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

1954

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

1955

help="show version number and exit")

1956

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

1957

help="Bind to interface IF")

1958

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

1959

help="Address to listen for requests on")

1960

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

1961

help="Port number to receive requests on")

1962

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

1963

help="Run self-test")

1964

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

1965

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

1966

" to terminal")

1967

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

1968

help="Debug level for stdout output")

1969

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

1970

" priority string (see GnuTLS documentation)")

1971

parser.add_argument("--servicename",

1972

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

1973

parser.add_argument("--configdir",

1974

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

1975

help="Directory to search for configuration"

1976

" files")

1977

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

1978

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

1979

" system bus interface")

1980

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

1981

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

1982

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

1983

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

1984

" state")

1985

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

1986

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

1987

1988

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]

1989

1704

1990

1705

if options.check:

1991

1706

import doctest

2003

1718

"use_dbus": "True",

2004

1719

"use_ipv6": "True",

2005

1720

"debuglevel": "",

2006

"restore": "True",

2007

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

2008

1721

}

2009

1722

2010

1723

# Parse config file for server-global settings

2027

1740

# options, if set.

2028

1741

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

2029

1742

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

2030

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

2031

"statedir"):

1743

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

2032

1744

value = getattr(options, option)

2033

1745

if value is not None:

2034

1746

server_settings[option] = value

2046

1758

debuglevel = server_settings["debuglevel"]

2047

1759

use_dbus = server_settings["use_dbus"]

2048

1760

use_ipv6 = server_settings["use_ipv6"]

2049

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

2050

stored_state_file)

2051

2052

if debug:

2053

initlogger(logging.DEBUG)

2054

else:

2055

if not debuglevel:

2056

initlogger()

2057

else:

2058

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

2059

initlogger(level)

2060

1761

2061

1762

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

2062

1763

syslogger.setFormatter(logging.Formatter

2063

1764

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

2065

1766

% server_settings["servicename"]))

2066

1767

2067

1768

# Parse config file with clients

2068

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

2069

"extended_timeout": "15m",

2070

"interval": "2m",

1769

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

1770

"interval": "5m",

2071

1771

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

2072

1772

"host": "",

2073

1773

"approval_delay": "0s",

2113

1813

try:

2114

1814

os.setgid(gid)

2115

1815

os.setuid(uid)

2116

except OSError as error:

1816

except OSError, error:

2117

1817

if error[0] != errno.EPERM:

2118

1818

raise error

2119

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

2120

1828

if debug:

2121

1829

# Enable all possible GnuTLS debugging

2122

1830

2153

1861

# End of Avahi example code

2154

1862

if use_dbus:

2155

1863

try:

2156

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

1864

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

2157

1865

bus, do_not_queue=True)

2158

old_bus_name = (dbus.service.BusName

2159

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

2160

do_not_queue=True))

2161

except dbus.exceptions.NameExistsException as e:

1866

except dbus.exceptions.NameExistsException, e:

2162

1867

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

2163

1868

use_dbus = False

2164

1869

server_settings["use_dbus"] = False

2165

1870

tcp_server.use_dbus = False

2166

1871

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2167

service = AvahiServiceToSyslog(name =

2168

server_settings["servicename"],

2169

servicetype = "_mandos._tcp",

2170

protocol = protocol, bus = bus)

1872

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

1873

servicetype = "_mandos._tcp",

1874

protocol = protocol, bus = bus)

2171

1875

if server_settings["interface"]:

2172

1876

service.interface = (if_nametoindex

2173

1877

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

2177

1881

2178

1882

client_class = Client

2179

1883

if use_dbus:

2180

client_class = functools.partial(ClientDBusTransitional,

2181

bus = bus)

2182

2183

special_settings = {

2184

# Some settings need to be accessd by special methods;

2185

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

2186

"approved_by_default":

2187

lambda section:

2188

client_config.getboolean(section, "approved_by_default"),

2189

"enabled":

2190

lambda section:

2191

client_config.getboolean(section, "enabled"),

2192

}

2193

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

2194

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

2195

# with exceptions for any special settings as defined above

2196

client_settings = dict((clientname,

2197

dict((setting,

2198

(value

2199

if setting not in special_settings

2200

else special_settings[setting]

2201

(clientname)))

2202

for setting, value in

2203

client_config.items(clientname)))

2204

for clientname in client_config.sections())

2205

2206

old_client_settings = {}

2207

clients_data = []

2208

2209

# Get client data and settings from last running state.

2210

if server_settings["restore"]:

2211

try:

2212

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

2213

clients_data, old_client_settings = (pickle.load

2214

(stored_state))

2215

os.remove(stored_state_path)

2216

except IOError as e:

2217

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

2218

.format(e))

2219

if e.errno != errno.ENOENT:

2220

raise

2221

2222

with PGPEngine() as pgp:

2223

for client in clients_data:

2224

client_name = client["name"]

2225

2226

# Decide which value to use after restoring saved state.

2227

# We have three different values: Old config file,

2228

# new config file, and saved state.

2229

# New config value takes precedence if it differs from old

2230

# config value, otherwise use saved state.

2231

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

2232

try:

2233

# For each value in new config, check if it

2234

# differs from the old config value (Except for

2235

# the "secret" attribute)

2236

if (name != "secret" and

2237

value != old_client_settings[client_name]

2238

[name]):

2239

client[name] = value

2240

except KeyError:

2241

pass

2242

2243

# Clients who has passed its expire date can still be

2244

# enabled if its last checker was sucessful. Clients

2245

# whose checker failed before we stored its state is

2246

# assumed to have failed all checkers during downtime.

2247

if client["enabled"]:

2248

if client["expires"] <= (datetime.datetime

2249

.utcnow()):

2250

# Client has expired

2251

if client["last_checker_status"] != 0:

2252

client["enabled"] = False

2253

else:

2254

client["expires"] = (datetime.datetime

2255

.utcnow()

2256

+ client["timeout"])

2257

2258

client["changedstate"] = (multiprocessing_manager

2259

.Condition

2260

(multiprocessing_manager

2261

.Lock()))

2262

if use_dbus:

2263

new_client = (ClientDBusTransitional.__new__

2264

(ClientDBusTransitional))

2265

tcp_server.clients[client_name] = new_client

2266

new_client.bus = bus

2267

for name, value in client.iteritems():

2268

setattr(new_client, name, value)

2269

client_object_name = unicode(client_name).translate(

2270

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

2271

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

2272

new_client.dbus_object_path = (dbus.ObjectPath

2273

("/clients/"

2274

+ client_object_name))

2275

DBusObjectWithProperties.__init__(new_client,

2276

new_client.bus,

2277

new_client

2278

.dbus_object_path)

2279

else:

2280

tcp_server.clients[client_name] = (Client.__new__

2281

(Client))

2282

for name, value in client.iteritems():

2283

setattr(tcp_server.clients[client_name],

2284

name, value)

2285

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):

2286

1892

try:

2287

tcp_server.clients[client_name].secret = (

2288

pgp.decrypt(tcp_server.clients[client_name]

2289

.encrypted_secret,

2290

client_settings[client_name]

2291

["secret"]))

2292

except PGPError:

2293

# If decryption fails, we use secret from new settings

2294

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

2295

.format(client_name))

2296

tcp_server.clients[client_name].secret = (

2297

client_settings[client_name]["secret"])

2298

2299

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

2300

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

2301

del tcp_server.clients[clientname]

2302

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

2303

tcp_server.clients[clientname] = (client_class(name

2304

= clientname,

2305

config =

2306

client_settings

2307

[clientname]))

2308

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()))

2309

1902

if not tcp_server.clients:

2310

1903

logger.warning("No clients defined")

2311

1904

2324

1917

del pidfilename

2325

1918

2326

1919

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

2327

1920

2328

1921

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

2329

1922

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

2330

1923

2333

1926

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

2334

1927

def __init__(self):

2335

1928

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

2336

_interface = "se.recompile.Mandos"

1929

_interface = "se.bsnet.fukt.Mandos"

2337

1930

2338

1931

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

2339

1932

def ClientAdded(self, objpath):

2354

1947

def GetAllClients(self):

2355

1948

"D-Bus method"

2356

1949

return dbus.Array(c.dbus_object_path

2357

for c in

2358

tcp_server.clients.itervalues())

1950

for c in tcp_server.clients)

2359

1951

2360

1952

@dbus.service.method(_interface,

2361

1953

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

2363

1955

"D-Bus method"

2364

1956

return dbus.Dictionary(

2365

1957

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

2366

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

1958

for c in tcp_server.clients),

2367

1959

signature="oa{sv}")

2368

1960

2369

1961

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

2370

1962

def RemoveClient(self, object_path):

2371

1963

"D-Bus method"

2372

for c in tcp_server.clients.itervalues():

1964

for c in tcp_server.clients:

2373

1965

if c.dbus_object_path == object_path:

2374

del tcp_server.clients[c.name]

1966

tcp_server.clients.remove(c)

2375

1967

c.remove_from_connection()

2376

1968

# Don't signal anything except ClientRemoved

2377

1969

c.disable(quiet=True)

2382

1974

2383

1975

del _interface

2384

1976

2385

class MandosDBusServiceTransitional(MandosDBusService):

2386

__metaclass__ = AlternateDBusNamesMetaclass

2387

mandos_dbus_service = MandosDBusServiceTransitional()

1977

mandos_dbus_service = MandosDBusService()

2388

1978

2389

1979

def cleanup():

2390

1980

"Cleanup function; run on exit"

2391

1981

service.cleanup()

2392

1982

2393

multiprocessing.active_children()

2394

if not (tcp_server.clients or client_settings):

2395

return

2396

2397

# Store client before exiting. Secrets are encrypted with key

2398

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

2399

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

2400

clients = []

2401

with PGPEngine() as pgp:

2402

for client in tcp_server.clients.itervalues():

2403

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

2404

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

2405

key)

2406

client_dict = {}

2407

2408

# A list of attributes that will not be stored when

2409

# shutting down.

2410

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

2411

for name, typ in (inspect.getmembers

2412

(dbus.service.Object)):

2413

exclude.add(name)

2414

2415

client_dict["encrypted_secret"] = (client

2416

.encrypted_secret)

2417

for attr in client.client_structure:

2418

if attr not in exclude:

2419

client_dict[attr] = getattr(client, attr)

2420

2421

clients.append(client_dict)

2422

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

2423

2424

try:

2425

with os.fdopen(os.open(stored_state_path,

2426

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

2427

0600), "wb") as stored_state:

2428

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

2429

except (IOError, OSError) as e:

2430

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

2431

.format(e))

2432

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

2433

raise

2434

2435

# Delete all clients, and settings from config

2436

1983

while tcp_server.clients:

2437

name, client = tcp_server.clients.popitem()

1984

client = tcp_server.clients.pop()

2438

1985

if use_dbus:

2439

1986

client.remove_from_connection()

1987

client.disable_hook = None

2440

1988

# Don't signal anything except ClientRemoved

2441

1989

client.disable(quiet=True)

2442

1990

if use_dbus:

2443

1991

# Emit D-Bus signal

2444

mandos_dbus_service.ClientRemoved(client

2445

.dbus_object_path,

1992

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2446

1993

client.name)

2447

client_settings.clear()

2448

1994

2449

1995

atexit.register(cleanup)

2450

1996

2451

for client in tcp_server.clients.itervalues():

1997

for client in tcp_server.clients:

2452

1998

if use_dbus:

2453

1999

# Emit D-Bus signal

2454

2000

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2455

# Need to initiate checking of clients

2456

if client.enabled:

2457

client.init_checker()

2001

client.enable()

2458

2002

2459

2003

tcp_server.enable()

2460

2004

tcp_server.server_activate()

2475

2019

# From the Avahi example code

2476

2020

try:

2477

2021

service.activate()

2478

except dbus.exceptions.DBusException as error:

2022

except dbus.exceptions.DBusException, error:

2479

2023

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

2480

2024

cleanup()

2481

2025

sys.exit(1)

2488

2032

2489

2033

logger.debug("Starting main loop")

2490

2034

main_loop.run()

2491

except AvahiError as error:

2035

except AvahiError, error:

2492

2036

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

2493

2037

cleanup()

2494

2038

sys.exit(1)

2500

2044

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

2501

2045

cleanup()

2502

2046

2503

2504

2047

if __name__ == '__main__':

2505

2048

main()