/mandos/trunk : revision 482

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# "AvahiService" class, and some lines in "main".

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#

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# Everything else is

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#

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# This program is free software: you can redistribute it and/or modify

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# it under the terms of the GNU General Public License as published by

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# along with this program. If not, see

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

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#

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

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

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#

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from __future__ import (division, absolute_import, print_function,

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import functools

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import cPickle as pickle

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import multiprocessing

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import types

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import binascii

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import tempfile

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import dbus

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import dbus.service

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import ctypes.util

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import xml.dom.minidom

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import inspect

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import GnuPGInterface

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try:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.5.1"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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version = "1.3.0"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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

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.if_nametoindex)

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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

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

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

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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

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interface))

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

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ifreq[16:20])[0]

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return interface_index

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def initlogger(debug, 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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if debug:

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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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'--no-use-agent'])

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def __enter__(self):

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return self

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

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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

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topdown = False):

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for filename in files:

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

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for dirname in dirs:

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

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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

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

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

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def encrypt(self, data, password):

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

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with open(os.devnull) as devnull:

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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ciphertext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return ciphertext

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def decrypt(self, data, password):

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

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with open(os.devnull) as devnull:

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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decrypted_plaintext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return decrypted_plaintext

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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class AvahiError(Exception):

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

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" after %i retries, exiting.",

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self.rename_count)

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raise AvahiServiceError("Too many renames")

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self.name = unicode(self.server

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.GetAlternativeServiceName(self.name))

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

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

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self.name)

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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self.remove()

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try:

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self.add()

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self.rename_count += 1

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def remove(self):

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

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException) as e:

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pass

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self.group = None

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match.remove()

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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if self.group is None:

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self.group = dbus.Interface(

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self.bus.get_object(avahi.DBUS_NAME,

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self.server.EntryGroupNew()),

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.group = dbus.Interface(

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self.bus.get_object(avahi.DBUS_NAME,

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self.server.EntryGroupNew(),

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follow_name_owner_changes=True),

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.entry_group_state_changed_match = (

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self.group.connect_to_signal(

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'StateChanged', self.entry_group_state_changed))

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'StateChanged', self .entry_group_state_changed))

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

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self.name, self.type)

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self.group.AddService(

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% unicode(error))

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def cleanup(self):

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

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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 = None

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self.remove()

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

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

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avahi.SERVER_FAILURE:

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"Zeroconf server failure" }

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if state in bad_states:

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if bad_states[state] is not None:

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if error is None:

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logger.error(bad_states[state])

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else:

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

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self.cleanup()

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if bad_states[state]:

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logger.error(bad_states[state])

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self.remove()

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elif state == avahi.SERVER_RUNNING:

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self.add()

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else:

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if error is None:

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

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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_state_changed)

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

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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return ret

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def timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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

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Attributes:

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

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

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

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

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

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

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checker_initiator_tag: a gobject event source tag, or None

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

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client_structure: Object describing what attributes a client has

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and is used for storing the client at exit

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current_checker_command: string; current running checker_command

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

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disable_initiator_tag: a gobject event source tag, or None

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enabled: bool()

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

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

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

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

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, or None.

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

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last_enabled: datetime.datetime(); (UTC)

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when secret has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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

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

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"extended_timeout": "15m",

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"interval": "2m",

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

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"host": "",

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"approval_delay": "0s",

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"approval_duration": "1s",

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"approved_by_default": "True",

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"enabled": "True",

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}

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@staticmethod

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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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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.extended_timeout)

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return self._timedelta_to_milliseconds(self.timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return timedelta_to_milliseconds(self.interval)

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return self._timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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

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

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with exceptions for any special settings as defined above.

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NOTE: Must be a pure function. Must return the same result

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value given the same arguments.

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"""

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settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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client = settings[client_name] = {}

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

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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

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"enabled")

480

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

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.replace(" ", ""))

483

if "secret" in section:

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

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elif "secfile" in section:

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

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(section["secfile"])),

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"rb") as secfile:

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

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else:

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

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% section)

493

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

504

client["last_checker_status"] = None

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506

return settings

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

316

return self._timedelta_to_milliseconds(self.approval_delay)

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

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

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

512

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attribute."""

513

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self.name = name

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# adding all client settings

515

for setting, value in settings.iteritems():

516

setattr(self, setting, value)

517

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if self.enabled:

519

if not hasattr(self, "last_enabled"):

520

self.last_enabled = datetime.datetime.utcnow()

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if not hasattr(self, "expires"):

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

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+ self.timeout)

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else:

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self.last_enabled = None

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self.expires = None

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if config is None:

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config = {}

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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# function

329

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

330

.replace(" ", ""))

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

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self.created = settings.get("created",

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datetime.datetime.utcnow())

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# attributes specific for this server instance

332

if "secret" in config:

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

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elif "secfile" in config:

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

336

(config["secfile"])),

337

"rb") as secfile:

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self.secret = secfile.read()

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else:

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

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% self.name)

342

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

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self.created = datetime.datetime.utcnow()

344

self.enabled = False

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self.last_approval_request = None

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self.last_enabled = None

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self.last_checked_ok = None

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

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

350

self.disable_hook = disable_hook

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self.checker = None

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self.checker_initiator_tag = None

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self.disable_initiator_tag = None

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self.checker_callback_tag = None

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self.checker_command = config["checker"]

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self.current_checker_command = None

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self.approved = None

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self.last_connect = None

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self._approved = None

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

360

True)

543

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self.approvals_pending = 0

544

self.changedstate = (multiprocessing_manager

545

.Condition(multiprocessing_manager

546

.Lock()))

547

self.client_structure = [attr for attr in

548

self.__dict__.iterkeys()

549

if not attr.startswith("_")]

550

self.client_structure.append("client_structure")

551

552

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

553

lambda obj:

554

isinstance(obj,

555

property)):

556

if not name.startswith("_"):

557

self.client_structure.append(name)

362

self.approval_delay = string_to_delta(

363

config["approval_delay"])

364

self.approval_duration = string_to_delta(

365

config["approval_duration"])

366

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

558

367

559

# Send notice to process children that client state has changed

560

368

def send_changedstate(self):

561

with self.changedstate:

562

self.changedstate.notify_all()

563

369

self.changedstate.acquire()

370

self.changedstate.notify_all()

371

self.changedstate.release()

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def enable(self):

565

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

566

375

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

567

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# Already enabled

568

377

return

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378

self.send_changedstate()

570

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

571

self.enabled = True

572

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self.last_enabled = datetime.datetime.utcnow()

573

self.init_checker()

380

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

381

# and every interval from then on.

382

self.checker_initiator_tag = (gobject.timeout_add

383

(self.interval_milliseconds(),

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self.start_checker))

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

386

self.disable_initiator_tag = (gobject.timeout_add

387

(self.timeout_milliseconds(),

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self.disable))

389

self.enabled = True

390

# Also start a new checker *right now*.

391

self.start_checker()

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def disable(self, quiet=True):

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"""Disable this client."""

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401

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

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402

gobject.source_remove(self.disable_initiator_tag)

585

403

self.disable_initiator_tag = None

586

self.expires = None

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

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405

gobject.source_remove(self.checker_initiator_tag)

589

406

self.checker_initiator_tag = None

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407

self.stop_checker()

408

if self.disable_hook:

409

self.disable_hook(self)

591

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self.enabled = False

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

593

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return False

594

413

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def __del__(self):

415

self.disable_hook = None

596

416

self.disable()

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598

def init_checker(self):

599

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

600

# and every interval from then on.

601

self.checker_initiator_tag = (gobject.timeout_add

602

(self.interval_milliseconds(),

603

self.start_checker))

604

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

605

self.disable_initiator_tag = (gobject.timeout_add

606

(self.timeout_milliseconds(),

607

self.disable))

608

# Also start a new checker *right now*.

609

self.start_checker()

610

611

418

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

612

419

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

613

420

self.checker_callback_tag = None

614

421

self.checker = None

615

422

if os.WIFEXITED(condition):

616

self.last_checker_status = os.WEXITSTATUS(condition)

617

if self.last_checker_status == 0:

423

exitstatus = os.WEXITSTATUS(condition)

424

if exitstatus == 0:

618

425

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

619

426

vars(self))

620

427

self.checked_ok()

622

429

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

623

430

vars(self))

624

431

else:

625

self.last_checker_status = -1

626

432

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

627

433

vars(self))

628

434

629

def checked_ok(self, timeout=None):

435

def checked_ok(self):

630

436

"""Bump up the timeout for this client.

631

437

632

438

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

633

439

alive and well.

634

440

"""

635

if timeout is None:

636

timeout = self.timeout

637

441

self.last_checked_ok = datetime.datetime.utcnow()

638

if self.disable_initiator_tag is not None:

639

gobject.source_remove(self.disable_initiator_tag)

640

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

641

self.disable_initiator_tag = (gobject.timeout_add

642

(timedelta_to_milliseconds

643

(timeout), self.disable))

644

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

442

gobject.source_remove(self.disable_initiator_tag)

443

self.disable_initiator_tag = (gobject.timeout_add

444

(self.timeout_milliseconds(),

445

self.disable))

645

446

646

447

def need_approval(self):

647

448

self.last_approval_request = datetime.datetime.utcnow()

687

488

'replace')))

688

489

for attr in

689

490

self.runtime_expansions)

690

491

691

492

try:

692

493

command = self.checker_command % escaped_attrs

693

494

except TypeError as error:

739

540

raise

740

541

self.checker = None

741

542

742

743

543

def dbus_service_property(dbus_interface, signature="v",

744

544

access="readwrite", byte_arrays=False):

745

545

"""Decorators for marking methods of a DBusObjectWithProperties to

791

591

792

592

class DBusObjectWithProperties(dbus.service.Object):

793

593

"""A D-Bus object with properties.

794

594

795

595

Classes inheriting from this can use the dbus_service_property

796

596

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

797

597

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

804

604

def _get_all_dbus_properties(self):

805

605

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

806

606

"""

807

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

808

for cls in self.__class__.__mro__

607

return ((prop._dbus_name, prop)

809

608

for name, prop in

810

inspect.getmembers(cls, self._is_dbus_property))

609

inspect.getmembers(self, self._is_dbus_property))

811

610

812

611

def _get_dbus_property(self, interface_name, property_name):

813

612

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

814

613

property with the specified name and interface.

815

614

"""

816

for cls in self.__class__.__mro__:

817

for name, value in (inspect.getmembers

818

(cls, self._is_dbus_property)):

819

if (value._dbus_name == property_name

820

and value._dbus_interface == interface_name):

821

return value.__get__(self)

822

615

for name in (property_name,

616

property_name + "_dbus_property"):

617

prop = getattr(self, name, None)

618

if (prop is None

619

or not self._is_dbus_property(prop)

620

or prop._dbus_name != property_name

621

or (interface_name and prop._dbus_interface

622

and interface_name != prop._dbus_interface)):

623

continue

624

return prop

823

625

# No such property

824

626

raise DBusPropertyNotFound(self.dbus_object_path + ":"

825

627

+ interface_name + "."

850

652

# signatures other than "ay".

851

653

if prop._dbus_signature != "ay":

852

654

raise ValueError

853

value = dbus.ByteArray(b''.join(chr(byte)

854

for byte in value))

655

value = dbus.ByteArray(''.join(unichr(byte)

656

for byte in value))

855

657

prop(value)

856

658

857

659

@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",

859

661

def GetAll(self, interface_name):

860

662

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

861

663

standard.

862

664

863

665

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

864

666

"""

865

properties = {}

667

all = {}

866

668

for name, prop in self._get_all_dbus_properties():

867

669

if (interface_name

868

670

and interface_name != prop._dbus_interface):

873

675

continue

874

676

value = prop()

875

677

if not hasattr(value, "variant_level"):

876

properties[name] = value

678

all[name] = value

877

679

continue

878

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

879

value.variant_level+1)

880

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

680

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

681

value.variant_level+1)

682

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

881

683

882

684

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

883

685

out_signature="s",

927

729

return xmlstring

928

730

929

731

930

def datetime_to_dbus (dt, variant_level=0):

931

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

932

if dt is None:

933

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

934

return dbus.String(dt.isoformat(),

935

variant_level=variant_level)

936

937

938

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

939

.__metaclass__):

940

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

941

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

942

"""

943

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

944

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

945

# methods, signals, or properties in them

946

for base in (b for b in bases

947

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

948

# Go though all attributes of the base class

949

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

950

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

951

# with the wrong interface name

952

if (not hasattr(attribute, "_dbus_interface")

953

or not attribute._dbus_interface

954

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

955

continue

956

# Create an alternate D-Bus interface name based on

957

# the current name

958

alt_interface = (attribute._dbus_interface

959

.replace("se.recompile.Mandos",

960

"se.bsnet.fukt.Mandos"))

961

# Is this a D-Bus signal?

962

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

963

# Extract the original non-method function by

964

# black magic

965

nonmethod_func = (dict(

966

zip(attribute.func_code.co_freevars,

967

attribute.__closure__))["func"]

968

.cell_contents)

969

# Create a new, but exactly alike, function

970

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

971

# with the alternate D-Bus interface name

972

new_function = (dbus.service.signal

973

(alt_interface,

974

attribute._dbus_signature)

975

(types.FunctionType(

976

nonmethod_func.func_code,

977

nonmethod_func.func_globals,

978

nonmethod_func.func_name,

979

nonmethod_func.func_defaults,

980

nonmethod_func.func_closure)))

981

# Define a creator of a function to call both the

982

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

983

# signals gets sent when the function is called

984

def fixscope(func1, func2):

985

"""This function is a scope container to pass

986

func1 and func2 to the "call_both" function

987

outside of its arguments"""

988

def call_both(*args, **kwargs):

989

"""This function will emit two D-Bus

990

signals by calling func1 and func2"""

991

func1(*args, **kwargs)

992

func2(*args, **kwargs)

993

return call_both

994

# Create the "call_both" function and add it to

995

# the class

996

attr[attrname] = fixscope(attribute,

997

new_function)

998

# Is this a D-Bus method?

999

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

1000

# Create a new, but exactly alike, function

1001

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

1002

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

1003

# to the class.

1004

attr[attrname] = (dbus.service.method

1005

(alt_interface,

1006

attribute._dbus_in_signature,

1007

attribute._dbus_out_signature)

1008

(types.FunctionType

1009

(attribute.func_code,

1010

attribute.func_globals,

1011

attribute.func_name,

1012

attribute.func_defaults,

1013

attribute.func_closure)))

1014

# Is this a D-Bus property?

1015

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

1016

# Create a new, but exactly alike, function

1017

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

1018

# property with the alternate D-Bus interface

1019

# name. Add it to the class.

1020

attr[attrname] = (dbus_service_property

1021

(alt_interface,

1022

attribute._dbus_signature,

1023

attribute._dbus_access,

1024

attribute

1025

._dbus_get_args_options

1026

["byte_arrays"])

1027

(types.FunctionType

1028

(attribute.func_code,

1029

attribute.func_globals,

1030

attribute.func_name,

1031

attribute.func_defaults,

1032

attribute.func_closure)))

1033

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

1034

1035

1036

732

class ClientDBus(Client, DBusObjectWithProperties):

1037

733

"""A Client class using D-Bus

1038

734

1047

743

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

1048

744

1049

745

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

746

self._approvals_pending = 0

1050

747

self.bus = bus

1051

748

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

1052

749

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

1059

756

DBusObjectWithProperties.__init__(self, self.bus,

1060

757

self.dbus_object_path)

1061

758

1062

def notifychangeproperty(transform_func,

1063

dbus_name, type_func=lambda x: x,

1064

variant_level=1):

1065

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

1066

its changes to DBus.

1067

1068

transform_fun: Function that takes a value and a variant_level

1069

and transforms it to a D-Bus type.

1070

dbus_name: D-Bus name of the variable

1071

type_func: Function that transform the value before sending it

1072

to the D-Bus. Default: no transform

1073

variant_level: D-Bus variant level. Default: 1

1074

"""

1075

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

1076

def setter(self, value):

1077

if hasattr(self, "dbus_object_path"):

1078

if (not hasattr(self, attrname) or

1079

type_func(getattr(self, attrname, None))

1080

!= type_func(value)):

1081

dbus_value = transform_func(type_func(value),

1082

variant_level

1083

=variant_level)

1084

self.PropertyChanged(dbus.String(dbus_name),

1085

dbus_value)

1086

setattr(self, attrname, value)

1087

1088

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

1089

1090

1091

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1092

approvals_pending = notifychangeproperty(dbus.Boolean,

1093

"ApprovalPending",

1094

type_func = bool)

1095

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

1096

last_enabled = notifychangeproperty(datetime_to_dbus,

1097

"LastEnabled")

1098

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

1099

type_func = lambda checker:

1100

checker is not None)

1101

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1102

"LastCheckedOK")

1103

last_approval_request = notifychangeproperty(

1104

datetime_to_dbus, "LastApprovalRequest")

1105

approved_by_default = notifychangeproperty(dbus.Boolean,

1106

"ApprovedByDefault")

1107

approval_delay = notifychangeproperty(dbus.UInt64,

1108

"ApprovalDelay",

1109

type_func =

1110

timedelta_to_milliseconds)

1111

approval_duration = notifychangeproperty(

1112

dbus.UInt64, "ApprovalDuration",

1113

type_func = timedelta_to_milliseconds)

1114

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

1115

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

1116

type_func =

1117

timedelta_to_milliseconds)

1118

extended_timeout = notifychangeproperty(

1119

dbus.UInt64, "ExtendedTimeout",

1120

type_func = timedelta_to_milliseconds)

1121

interval = notifychangeproperty(dbus.UInt64,

1122

"Interval",

1123

type_func =

1124

timedelta_to_milliseconds)

1125

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

1126

1127

del notifychangeproperty

759

def _get_approvals_pending(self):

760

return self._approvals_pending

761

def _set_approvals_pending(self, value):

762

old_value = self._approvals_pending

763

self._approvals_pending = value

764

bval = bool(value)

765

if (hasattr(self, "dbus_object_path")

766

and bval is not bool(old_value)):

767

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

768

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

769

dbus_bool)

770

771

approvals_pending = property(_get_approvals_pending,

772

_set_approvals_pending)

773

del _get_approvals_pending, _set_approvals_pending

774

775

@staticmethod

776

def _datetime_to_dbus(dt, variant_level=0):

777

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

778

return dbus.String(dt.isoformat(),

779

variant_level=variant_level)

780

781

def enable(self):

782

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

783

r = Client.enable(self)

784

if oldstate != self.enabled:

785

# Emit D-Bus signals

786

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

787

dbus.Boolean(True, variant_level=1))

788

self.PropertyChanged(

789

dbus.String("LastEnabled"),

790

self._datetime_to_dbus(self.last_enabled,

791

variant_level=1))

792

return r

793

794

def disable(self, quiet = False):

795

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

796

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

797

if not quiet and oldstate != self.enabled:

798

# Emit D-Bus signal

799

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

800

dbus.Boolean(False, variant_level=1))

801

return r

1128

802

1129

803

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

1130

804

try:

1139

813

*args, **kwargs):

1140

814

self.checker_callback_tag = None

1141

815

self.checker = None

816

# Emit D-Bus signal

817

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

818

dbus.Boolean(False, variant_level=1))

1142

819

if os.WIFEXITED(condition):

1143

820

exitstatus = os.WEXITSTATUS(condition)

1144

821

# Emit D-Bus signal

1154

831

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

1155

832

*args, **kwargs)

1156

833

834

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

835

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

836

# Emit D-Bus signal

837

self.PropertyChanged(

838

dbus.String("LastCheckedOK"),

839

(self._datetime_to_dbus(self.last_checked_ok,

840

variant_level=1)))

841

842

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

843

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

844

# Emit D-Bus signal

845

self.PropertyChanged(

846

dbus.String("LastApprovalRequest"),

847

(self._datetime_to_dbus(self.last_approval_request,

848

variant_level=1)))

849

return r

850

1157

851

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

1158

852

old_checker = self.checker

1159

853

if self.checker is not None:

1166

860

and old_checker_pid != self.checker.pid):

1167

861

# Emit D-Bus signal

1168

862

self.CheckerStarted(self.current_checker_command)

863

self.PropertyChanged(

864

dbus.String("CheckerRunning"),

865

dbus.Boolean(True, variant_level=1))

1169

866

return r

1170

867

868

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

869

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

870

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

871

if (old_checker is not None

872

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

873

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

874

dbus.Boolean(False, variant_level=1))

875

return r

876

1171

877

def _reset_approved(self):

1172

self.approved = None

878

self._approved = None

1173

879

return False

1174

880

1175

881

def approve(self, value=True):

1176

882

self.send_changedstate()

1177

self.approved = value

1178

gobject.timeout_add(timedelta_to_milliseconds

883

self._approved = value

884

gobject.timeout_add(self._timedelta_to_milliseconds

1179

885

(self.approval_duration),

1180

886

self._reset_approved)

1181

887

1182

888

1183

889

## D-Bus methods, signals & properties

1184

_interface = "se.recompile.Mandos.Client"

890

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

1185

891

1186

892

## Signals

1187

893

1273

979

if value is None: # get

1274

980

return dbus.Boolean(self.approved_by_default)

1275

981

self.approved_by_default = bool(value)

982

# Emit D-Bus signal

983

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

984

dbus.Boolean(value, variant_level=1))

1276

985

1277

986

# ApprovalDelay - property

1278

987

@dbus_service_property(_interface, signature="t",

1281

990

if value is None: # get

1282

991

return dbus.UInt64(self.approval_delay_milliseconds())

1283

992

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

993

# Emit D-Bus signal

994

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

995

dbus.UInt64(value, variant_level=1))

1284

996

1285

997

# ApprovalDuration - property

1286

998

@dbus_service_property(_interface, signature="t",

1287

999

access="readwrite")

1288

1000

def ApprovalDuration_dbus_property(self, value=None):

1289

1001

if value is None: # get

1290

return dbus.UInt64(timedelta_to_milliseconds(

1002

return dbus.UInt64(self._timedelta_to_milliseconds(

1291

1003

self.approval_duration))

1292

1004

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

1005

# Emit D-Bus signal

1006

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

1007

dbus.UInt64(value, variant_level=1))

1293

1008

1294

1009

# Name - property

1295

1010

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

1307

1022

def Host_dbus_property(self, value=None):

1308

1023

if value is None: # get

1309

1024

return dbus.String(self.host)

1310

self.host = unicode(value)

1025

self.host = value

1026

# Emit D-Bus signal

1027

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

1028

dbus.String(value, variant_level=1))

1311

1029

1312

1030

# Created - property

1313

1031

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

1314

1032

def Created_dbus_property(self):

1315

return datetime_to_dbus(self.created)

1033

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

1316

1034

1317

1035

# LastEnabled - property

1318

1036

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

1319

1037

def LastEnabled_dbus_property(self):

1320

return datetime_to_dbus(self.last_enabled)

1038

if self.last_enabled is None:

1039

return dbus.String("")

1040

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

1321

1041

1322

1042

# Enabled - property

1323

1043

@dbus_service_property(_interface, signature="b",

1337

1057

if value is not None:

1338

1058

self.checked_ok()

1339

1059

return

1340

return datetime_to_dbus(self.last_checked_ok)

1341

1342

# Expires - property

1343

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

1344

def Expires_dbus_property(self):

1345

return datetime_to_dbus(self.expires)

1060

if self.last_checked_ok is None:

1061

return dbus.String("")

1062

return dbus.String(self._datetime_to_dbus(self

1063

.last_checked_ok))

1346

1064

1347

1065

# LastApprovalRequest - property

1348

1066

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

1349

1067

def LastApprovalRequest_dbus_property(self):

1350

return datetime_to_dbus(self.last_approval_request)

1068

if self.last_approval_request is None:

1069

return dbus.String("")

1070

return dbus.String(self.

1071

_datetime_to_dbus(self

1072

.last_approval_request))

1351

1073

1352

1074

# Timeout - property

1353

1075

@dbus_service_property(_interface, signature="t",

1356

1078

if value is None: # get

1357

1079

return dbus.UInt64(self.timeout_milliseconds())

1358

1080

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

1081

# Emit D-Bus signal

1082

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

1083

dbus.UInt64(value, variant_level=1))

1084

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

1085

return

1359

1086

# Reschedule timeout

1360

if self.enabled:

1361

now = datetime.datetime.utcnow()

1362

time_to_die = timedelta_to_milliseconds(

1363

(self.last_checked_ok + self.timeout) - now)

1364

if time_to_die <= 0:

1365

# The timeout has passed

1366

self.disable()

1367

else:

1368

self.expires = (now +

1369

datetime.timedelta(milliseconds =

1370

time_to_die))

1371

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

1372

is None):

1373

return

1374

gobject.source_remove(self.disable_initiator_tag)

1375

self.disable_initiator_tag = (gobject.timeout_add

1376

(time_to_die,

1377

self.disable))

1378

1379

# ExtendedTimeout - property

1380

@dbus_service_property(_interface, signature="t",

1381

access="readwrite")

1382

def ExtendedTimeout_dbus_property(self, value=None):

1383

if value is None: # get

1384

return dbus.UInt64(self.extended_timeout_milliseconds())

1385

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

1087

gobject.source_remove(self.disable_initiator_tag)

1088

self.disable_initiator_tag = None

1089

time_to_die = (self.

1090

_timedelta_to_milliseconds((self

1091

.last_checked_ok

1092

+ self.timeout)

1093

- datetime.datetime

1094

.utcnow()))

1095

if time_to_die <= 0:

1096

# The timeout has passed

1097

self.disable()

1098

else:

1099

self.disable_initiator_tag = (gobject.timeout_add

1100

(time_to_die, self.disable))

1386

1101

1387

1102

# Interval - property

1388

1103

@dbus_service_property(_interface, signature="t",

1391

1106

if value is None: # get

1392

1107

return dbus.UInt64(self.interval_milliseconds())

1393

1108

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

1109

# Emit D-Bus signal

1110

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

1111

dbus.UInt64(value, variant_level=1))

1394

1112

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

1395

1113

return

1396

if self.enabled:

1397

# Reschedule checker run

1398

gobject.source_remove(self.checker_initiator_tag)

1399

self.checker_initiator_tag = (gobject.timeout_add

1400

(value, self.start_checker))

1401

self.start_checker() # Start one now, too

1402

1114

# Reschedule checker run

1115

gobject.source_remove(self.checker_initiator_tag)

1116

self.checker_initiator_tag = (gobject.timeout_add

1117

(value, self.start_checker))

1118

self.start_checker() # Start one now, too

1119

1403

1120

# Checker - property

1404

1121

@dbus_service_property(_interface, signature="s",

1405

1122

access="readwrite")

1406

1123

def Checker_dbus_property(self, value=None):

1407

1124

if value is None: # get

1408

1125

return dbus.String(self.checker_command)

1409

self.checker_command = unicode(value)

1126

self.checker_command = value

1127

# Emit D-Bus signal

1128

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

1129

dbus.String(self.checker_command,

1130

variant_level=1))

1410

1131

1411

1132

# CheckerRunning - property

1412

1133

@dbus_service_property(_interface, signature="b",

1439

1160

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

1440

1161

if not self._pipe.recv():

1441

1162

raise KeyError()

1442

1163

1443

1164

def __getattribute__(self, name):

1444

if name == '_pipe':

1165

if(name == '_pipe'):

1445

1166

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

1446

1167

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

1447

1168

data = self._pipe.recv()

1452

1173

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

1453

1174

return self._pipe.recv()[1]

1454

1175

return func

1455

1176

1456

1177

def __setattr__(self, name, value):

1457

if name == '_pipe':

1178

if(name == '_pipe'):

1458

1179

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

1459

1180

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

1460

1181

1461

1182

1462

class ClientDBusTransitional(ClientDBus):

1463

__metaclass__ = AlternateDBusNamesMetaclass

1464

1465

1466

1183

class ClientHandler(socketserver.BaseRequestHandler, object):

1467

1184

"""A class to handle client connections.

1468

1185

1475

1192

unicode(self.client_address))

1476

1193

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

1477

1194

self.server.child_pipe.fileno())

1478

1195

1479

1196

session = (gnutls.connection

1480

1197

.ClientSession(self.request,

1481

1198

gnutls.connection

1482

1199

.X509Credentials()))

1483

1200

1484

1201

# Note: gnutls.connection.X509Credentials is really a

1485

1202

# generic GnuTLS certificate credentials object so long as

1486

1203

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

1487

1204

# here despite using OpenPGP certificates.

1488

1205

1489

1206

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

1490

1207

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

1491

1208

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

1497

1214

(gnutls.library.functions

1498

1215

.gnutls_priority_set_direct(session._c_object,

1499

1216

priority, None))

1500

1217

1501

1218

# Start communication using the Mandos protocol

1502

1219

# Get protocol number

1503

1220

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

1508

1225

except (ValueError, IndexError, RuntimeError) as error:

1509

1226

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

1510

1227

return

1511

1228

1512

1229

# Start GnuTLS connection

1513

1230

try:

1514

1231

session.handshake()

1518

1235

# established. Just abandon the request.

1519

1236

return

1520

1237

logger.debug("Handshake succeeded")

1521

1238

1522

1239

approval_required = False

1523

1240

try:

1524

1241

try:

1529

1246

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

1530

1247

return

1531

1248

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

1532

1249

1533

1250

try:

1534

1251

client = ProxyClient(child_pipe, fpr,

1535

1252

self.client_address)

1543

1260

1544

1261

while True:

1545

1262

if not client.enabled:

1546

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

1263

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

1547

1264

client.name)

1548

1265

if self.server.use_dbus:

1549

1266

# Emit D-Bus signal

1550

client.Rejected("Disabled")

1267

client.Rejected("Disabled")

1551

1268

return

1552

1269

1553

if client.approved or not client.approval_delay:

1270

if client._approved or not client.approval_delay:

1554

1271

#We are approved or approval is disabled

1555

1272

break

1556

elif client.approved is None:

1273

elif client._approved is None:

1557

1274

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

1558

1275

client.name)

1559

1276

if self.server.use_dbus:

1570

1287

return

1571

1288

1572

1289

#wait until timeout or approved

1290

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

1573

1291

time = datetime.datetime.now()

1574

1292

client.changedstate.acquire()

1575

(client.changedstate.wait

1576

(float(client.timedelta_to_milliseconds(delay)

1577

/ 1000)))

1293

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

1578

1294

client.changedstate.release()

1579

1295

time2 = datetime.datetime.now()

1580

1296

if (time2 - time) >= delay:

1602

1318

sent, len(client.secret)

1603

1319

- (sent_size + sent))

1604

1320

sent_size += sent

1605

1321

1606

1322

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

1607

# bump the timeout using extended_timeout

1608

client.checked_ok(client.extended_timeout)

1323

# bump the timeout as if seen

1324

client.checked_ok()

1609

1325

if self.server.use_dbus:

1610

1326

# Emit D-Bus signal

1611

1327

client.GotSecret()

1678

1394

# Convert the buffer to a Python bytestring

1679

1395

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

1680

1396

# Convert the bytestring to hexadecimal notation

1681

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

1397

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

1682

1398

return hex_fpr

1683

1399

1684

1400

1687

1403

def sub_process_main(self, request, address):

1688

1404

try:

1689

1405

self.finish_request(request, address)

1690

except Exception:

1406

except:

1691

1407

self.handle_error(request, address)

1692

1408

self.close_request(request)

1693

1409

1694

1410

def process_request(self, request, address):

1695

1411

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

1696

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

1697

args = (request,

1698

address))

1699

proc.start()

1700

return proc

1701

1412

multiprocessing.Process(target = self.sub_process_main,

1413

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

1702

1414

1703

1415

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1704

1416

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

1708

1420

This function creates a new pipe in self.pipe

1709

1421

"""

1710

1422

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1711

1712

proc = MultiprocessingMixIn.process_request(self, request,

1713

client_address)

1423

1424

super(MultiprocessingMixInWithPipe,

1425

self).process_request(request, client_address)

1714

1426

self.child_pipe.close()

1715

self.add_pipe(parent_pipe, proc)

1716

1717

def add_pipe(self, parent_pipe, proc):

1427

self.add_pipe(parent_pipe)

1428

1429

def add_pipe(self, parent_pipe):

1718

1430

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

1719

1431

raise NotImplementedError

1720

1432

1721

1722

1433

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1723

1434

socketserver.TCPServer, object):

1724

1435

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

1798

1509

self.enabled = False

1799

1510

self.clients = clients

1800

1511

if self.clients is None:

1801

self.clients = {}

1512

self.clients = set()

1802

1513

self.use_dbus = use_dbus

1803

1514

self.gnutls_priority = gnutls_priority

1804

1515

IPv6_TCPServer.__init__(self, server_address,

1808

1519

def server_activate(self):

1809

1520

if self.enabled:

1810

1521

return socketserver.TCPServer.server_activate(self)

1811

1812

1522

def enable(self):

1813

1523

self.enabled = True

1814

1815

def add_pipe(self, parent_pipe, proc):

1524

def add_pipe(self, parent_pipe):

1816

1525

# Call "handle_ipc" for both data and EOF events

1817

1526

gobject.io_add_watch(parent_pipe.fileno(),

1818

1527

gobject.IO_IN | gobject.IO_HUP,

1819

1528

functools.partial(self.handle_ipc,

1820

parent_pipe =

1821

parent_pipe,

1822

proc = proc))

1823

1529

parent_pipe = parent_pipe))

1530

1824

1531

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

1825

proc = None, client_object=None):

1532

client_object=None):

1826

1533

condition_names = {

1827

1534

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

1828

1535

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

1837

1544

for cond, name in

1838

1545

condition_names.iteritems()

1839

1546

if cond & condition)

1840

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

1547

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

1841

1548

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

1842

# Wait for other process to exit

1843

proc.join()

1844

1549

return False

1845

1550

1846

1551

# Read a request from the child

1851

1556

fpr = request[1]

1852

1557

address = request[2]

1853

1558

1854

for c in self.clients.itervalues():

1559

for c in self.clients:

1855

1560

if c.fingerprint == fpr:

1856

1561

client = c

1857

1562

break

1858

1563

else:

1859

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

1860

"dress: %s", fpr, address)

1564

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

1565

"dress: %s", fpr, address)

1861

1566

if self.use_dbus:

1862

1567

# Emit D-Bus signal

1863

mandos_dbus_service.ClientNotFound(fpr,

1864

address[0])

1568

mandos_dbus_service.ClientNotFound(fpr, address[0])

1865

1569

parent_pipe.send(False)

1866

1570

return False

1867

1571

1868

1572

gobject.io_add_watch(parent_pipe.fileno(),

1869

1573

gobject.IO_IN | gobject.IO_HUP,

1870

1574

functools.partial(self.handle_ipc,

1871

parent_pipe =

1872

parent_pipe,

1873

proc = proc,

1874

client_object =

1875

client))

1575

parent_pipe = parent_pipe,

1576

client_object = client))

1876

1577

parent_pipe.send(True)

1877

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

1878

# same fileno

1578

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

1879

1579

return False

1880

1580

if command == 'funcall':

1881

1581

funcname = request[1]

1882

1582

args = request[2]

1883

1583

kwargs = request[3]

1884

1584

1885

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

1886

funcname)(*args,

1887

**kwargs)))

1888

1585

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

1586

1889

1587

if command == 'getattr':

1890

1588

attrname = request[1]

1891

1589

if callable(client_object.__getattribute__(attrname)):

1892

1590

parent_pipe.send(('function',))

1893

1591

else:

1894

parent_pipe.send(('data', client_object

1895

.__getattribute__(attrname)))

1592

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

1896

1593

1897

1594

if command == 'setattr':

1898

1595

attrname = request[1]

1899

1596

value = request[2]

1900

1597

setattr(client_object, attrname, value)

1901

1598

1902

1599

return True

1903

1600

1904

1601

1941

1638

return timevalue

1942

1639

1943

1640

1641

def if_nametoindex(interface):

1642

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

1643

1644

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

1645

global if_nametoindex

1646

try:

1647

if_nametoindex = (ctypes.cdll.LoadLibrary

1648

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

1649

.if_nametoindex)

1650

except (OSError, AttributeError):

1651

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

1652

def if_nametoindex(interface):

1653

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

1654

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

1655

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

1656

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1657

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

1658

interface))

1659

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

1660

ifreq[16:20])[0]

1661

return interface_index

1662

return if_nametoindex(interface)

1663

1664

1944

1665

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

1945

1666

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

1946

1667

2001

1722

" system bus interface")

2002

1723

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

2003

1724

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

2004

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

2005

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

2006

" state")

2007

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

2008

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

2009

2010

1725

options = parser.parse_args()

2011

1726

2012

1727

if options.check:

2025

1740

"use_dbus": "True",

2026

1741

"use_ipv6": "True",

2027

1742

"debuglevel": "",

2028

"restore": "True",

2029

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

2030

1743

}

2031

1744

2032

1745

# Parse config file for server-global settings

2049

1762

# options, if set.

2050

1763

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

2051

1764

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

2052

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

2053

"statedir"):

1765

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

2054

1766

value = getattr(options, option)

2055

1767

if value is not None:

2056

1768

server_settings[option] = value

2068

1780

debuglevel = server_settings["debuglevel"]

2069

1781

use_dbus = server_settings["use_dbus"]

2070

1782

use_ipv6 = server_settings["use_ipv6"]

2071

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

2072

stored_state_file)

2073

2074

if debug:

2075

initlogger(debug, logging.DEBUG)

2076

else:

2077

if not debuglevel:

2078

initlogger(debug)

2079

else:

2080

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

2081

initlogger(debug, level)

2082

1783

2083

1784

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

2084

1785

syslogger.setFormatter(logging.Formatter

2085

1786

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

2087

1788

% server_settings["servicename"]))

2088

1789

2089

1790

# Parse config file with clients

2090

client_config = configparser.SafeConfigParser(Client

2091

.client_defaults)

1791

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

1792

"interval": "5m",

1793

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

1794

"host": "",

1795

"approval_delay": "0s",

1796

"approval_duration": "1s",

1797

}

1798

client_config = configparser.SafeConfigParser(client_defaults)

2092

1799

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

2093

1800

"clients.conf"))

2094

1801

2132

1839

if error[0] != errno.EPERM:

2133

1840

raise error

2134

1841

1842

if not debug and not debuglevel:

1843

syslogger.setLevel(logging.WARNING)

1844

console.setLevel(logging.WARNING)

1845

if debuglevel:

1846

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

1847

syslogger.setLevel(level)

1848

console.setLevel(level)

1849

2135

1850

if debug:

2136

1851

# Enable all possible GnuTLS debugging

2137

1852

2151

1866

os.dup2(null, sys.stdin.fileno())

2152

1867

if null > 2:

2153

1868

os.close(null)

1869

else:

1870

# No console logging

1871

logger.removeHandler(console)

2154

1872

2155

1873

# Need to fork before connecting to D-Bus

2156

1874

if not debug:

2157

1875

# Close all input and output, do double fork, etc.

2158

1876

daemon()

2159

1877

2160

gobject.threads_init()

2161

2162

1878

global main_loop

2163

1879

# From the Avahi example code

2164

1880

DBusGMainLoop(set_as_default=True )

2167

1883

# End of Avahi example code

2168

1884

if use_dbus:

2169

1885

try:

2170

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

1886

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

2171

1887

bus, do_not_queue=True)

2172

old_bus_name = (dbus.service.BusName

2173

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

2174

do_not_queue=True))

2175

1888

except dbus.exceptions.NameExistsException as e:

2176

1889

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

2177

1890

use_dbus = False

2178

1891

server_settings["use_dbus"] = False

2179

1892

tcp_server.use_dbus = False

2180

1893

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2181

service = AvahiServiceToSyslog(name =

2182

server_settings["servicename"],

2183

servicetype = "_mandos._tcp",

2184

protocol = protocol, bus = bus)

1894

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

1895

servicetype = "_mandos._tcp",

1896

protocol = protocol, bus = bus)

2185

1897

if server_settings["interface"]:

2186

1898

service.interface = (if_nametoindex

2187

1899

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

2191

1903

2192

1904

client_class = Client

2193

1905

if use_dbus:

2194

client_class = functools.partial(ClientDBusTransitional,

2195

bus = bus)

2196

2197

client_settings = Client.config_parser(client_config)

2198

old_client_settings = {}

2199

clients_data = {}

2200

2201

# Get client data and settings from last running state.

2202

if server_settings["restore"]:

2203

try:

2204

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

2205

clients_data, old_client_settings = (pickle.load

2206

(stored_state))

2207

os.remove(stored_state_path)

2208

except IOError as e:

2209

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

2210

.format(e))

2211

if e.errno != errno.ENOENT:

2212

raise

2213

except EOFError as e:

2214

logger.warning("Could not load persistent state: "

2215

"EOFError: {0}".format(e))

2216

2217

with PGPEngine() as pgp:

2218

for client_name, client in clients_data.iteritems():

2219

# Decide which value to use after restoring saved state.

2220

# We have three different values: Old config file,

2221

# new config file, and saved state.

2222

# New config value takes precedence if it differs from old

2223

# config value, otherwise use saved state.

2224

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

2225

try:

2226

# For each value in new config, check if it

2227

# differs from the old config value (Except for

2228

# the "secret" attribute)

2229

if (name != "secret" and

2230

value != old_client_settings[client_name]

2231

[name]):

2232

client[name] = value

2233

except KeyError:

2234

pass

2235

2236

# Clients who has passed its expire date can still be

2237

# enabled if its last checker was successful. Clients

2238

# whose checker succeeded before we stored its state is

2239

# assumed to have successfully run all checkers during

2240

# downtime.

2241

if client["enabled"]:

2242

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

2243

if not client["last_checked_ok"]:

2244

logger.warning(

2245

"disabling client {0} - Client never "

2246

"performed a successful checker"

2247

.format(client_name))

2248

client["enabled"] = False

2249

elif client["last_checker_status"] != 0:

2250

logger.warning(

2251

"disabling client {0} - Client "

2252

"last checker failed with error code {1}"

2253

.format(client_name,

2254

client["last_checker_status"]))

2255

client["enabled"] = False

2256

else:

2257

client["expires"] = (datetime.datetime

2258

.utcnow()

2259

+ client["timeout"])

2260

logger.debug("Last checker succeeded,"

2261

" keeping {0} enabled"

2262

.format(client_name))

1906

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

1907

def client_config_items(config, section):

1908

special_settings = {

1909

"approved_by_default":

1910

lambda: config.getboolean(section,

1911

"approved_by_default"),

1912

}

1913

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

2263

1914

try:

2264

client["secret"] = (

2265

pgp.decrypt(client["encrypted_secret"],

2266

client_settings[client_name]

2267

["secret"]))

2268

except PGPError:

2269

# If decryption fails, we use secret from new settings

2270

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

2271

.format(client_name))

2272

client["secret"] = (

2273

client_settings[client_name]["secret"])

2274

2275

2276

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

2277

for client_name in (set(old_client_settings)

2278

- set(client_settings)):

2279

del clients_data[client_name]

2280

for client_name in (set(client_settings)

2281

- set(old_client_settings)):

2282

clients_data[client_name] = client_settings[client_name]

2283

2284

# Create all client objects

2285

for client_name, client in clients_data.iteritems():

2286

tcp_server.clients[client_name] = client_class(

2287

name = client_name, settings = client)

2288

1915

yield (name, special_settings[name]())

1916

except KeyError:

1917

yield (name, value)

1918

1919

tcp_server.clients.update(set(

1920

client_class(name = section,

1921

config= dict(client_config_items(

1922

client_config, section)))

1923

for section in client_config.sections()))

2289

1924

if not tcp_server.clients:

2290

1925

logger.warning("No clients defined")

2291

1926

2302

1937

# "pidfile" was never created

2303

1938

pass

2304

1939

del pidfilename

1940

2305

1941

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

2306

1942

2307

1943

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

2308

1944

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

2309

1945

2312

1948

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

2313

1949

def __init__(self):

2314

1950

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

2315

_interface = "se.recompile.Mandos"

1951

_interface = "se.bsnet.fukt.Mandos"

2316

1952

2317

1953

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

2318

1954

def ClientAdded(self, objpath):

2333

1969

def GetAllClients(self):

2334

1970

"D-Bus method"

2335

1971

return dbus.Array(c.dbus_object_path

2336

for c in

2337

tcp_server.clients.itervalues())

1972

for c in tcp_server.clients)

2338

1973

2339

1974

@dbus.service.method(_interface,

2340

1975

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

2342

1977

"D-Bus method"

2343

1978

return dbus.Dictionary(

2344

1979

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

2345

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

1980

for c in tcp_server.clients),

2346

1981

signature="oa{sv}")

2347

1982

2348

1983

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

2349

1984

def RemoveClient(self, object_path):

2350

1985

"D-Bus method"

2351

for c in tcp_server.clients.itervalues():

1986

for c in tcp_server.clients:

2352

1987

if c.dbus_object_path == object_path:

2353

del tcp_server.clients[c.name]

1988

tcp_server.clients.remove(c)

2354

1989

c.remove_from_connection()

2355

1990

# Don't signal anything except ClientRemoved

2356

1991

c.disable(quiet=True)

2361

1996

2362

1997

del _interface

2363

1998

2364

class MandosDBusServiceTransitional(MandosDBusService):

2365

__metaclass__ = AlternateDBusNamesMetaclass

2366

mandos_dbus_service = MandosDBusServiceTransitional()

1999

mandos_dbus_service = MandosDBusService()

2367

2000

2368

2001

def cleanup():

2369

2002

"Cleanup function; run on exit"

2370

2003

service.cleanup()

2371

2004

2372

multiprocessing.active_children()

2373

if not (tcp_server.clients or client_settings):

2374

return

2375

2376

# Store client before exiting. Secrets are encrypted with key

2377

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

2378

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

2379

clients = {}

2380

with PGPEngine() as pgp:

2381

for client in tcp_server.clients.itervalues():

2382

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

2383

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

2384

key)

2385

client_dict = {}

2386

2387

# A list of attributes that can not be pickled

2388

# + secret.

2389

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

2390

"checker"))

2391

for name, typ in (inspect.getmembers

2392

(dbus.service.Object)):

2393

exclude.add(name)

2394

2395

client_dict["encrypted_secret"] = (client

2396

.encrypted_secret)

2397

for attr in client.client_structure:

2398

if attr not in exclude:

2399

client_dict[attr] = getattr(client, attr)

2400

2401

clients[client.name] = client_dict

2402

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

2403

2404

try:

2405

tempfd, tempname = tempfile.mkstemp(suffix=".pickle",

2406

prefix="clients-",

2407

dir=os.path.dirname

2408

(stored_state_path))

2409

with os.fdopen(tempfd, "wb") as stored_state:

2410

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

2411

os.rename(tempname, stored_state_path)

2412

except (IOError, OSError) as e:

2413

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

2414

.format(e))

2415

if not debug:

2416

try:

2417

os.remove(tempname)

2418

except NameError:

2419

pass

2420

if e.errno not in set((errno.ENOENT, errno.EACCES,

2421

errno.EEXIST)):

2422

raise e

2423

2424

# Delete all clients, and settings from config

2425

2005

while tcp_server.clients:

2426

name, client = tcp_server.clients.popitem()

2006

client = tcp_server.clients.pop()

2427

2007

if use_dbus:

2428

2008

client.remove_from_connection()

2009

client.disable_hook = None

2429

2010

# Don't signal anything except ClientRemoved

2430

2011

client.disable(quiet=True)

2431

2012

if use_dbus:

2432

2013

# Emit D-Bus signal

2433

mandos_dbus_service.ClientRemoved(client

2434

.dbus_object_path,

2014

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2435

2015

client.name)

2436

client_settings.clear()

2437

2016

2438

2017

atexit.register(cleanup)

2439

2018

2440

for client in tcp_server.clients.itervalues():

2019

for client in tcp_server.clients:

2441

2020

if use_dbus:

2442

2021

# Emit D-Bus signal

2443

2022

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2444

# Need to initiate checking of clients

2445

if client.enabled:

2446

client.init_checker()

2023

client.enable()

2447

2024

2448

2025

tcp_server.enable()

2449

2026

tcp_server.server_activate()