/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 = "1.5.2"

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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, -2 means no checker completed yet.

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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,

479

"enabled")

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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"

492

% 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

503

client["last_checked_ok"] = None

504

client["last_checker_status"] = -2

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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

518

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)

529

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# Uppercase and remove spaces from fingerprint for later

530

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# comparison purposes with return value from the fingerprint()

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# function

329

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

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.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:

340

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

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% self.name)

342

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

343

self.created = datetime.datetime.utcnow()

344

self.enabled = False

345

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"])

349

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

540

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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

542

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

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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

569

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

587

404

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

588

405

gobject.source_remove(self.checker_initiator_tag)

589

406

self.checker_initiator_tag = None

590

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

412

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

435

def checked_ok(self):

630

"""Assert that the client has been seen, alive and well."""

436

"""Bump up the timeout for this client.

437

438

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

439

alive and well.

440

"""

631

441

self.last_checked_ok = datetime.datetime.utcnow()

632

self.last_checker_status = 0

633

self.bump_timeout()

634

635

def bump_timeout(self, timeout=None):

636

"""Bump up the timeout for this client."""

637

if timeout is None:

638

timeout = self.timeout

639

if self.disable_initiator_tag is not None:

640

gobject.source_remove(self.disable_initiator_tag)

641

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

642

self.disable_initiator_tag = (gobject.timeout_add

643

(timedelta_to_milliseconds

644

(timeout), self.disable))

645

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))

646

446

647

447

def need_approval(self):

648

448

self.last_approval_request = datetime.datetime.utcnow()

688

488

'replace')))

689

489

for attr in

690

490

self.runtime_expansions)

691

491

692

492

try:

693

493

command = self.checker_command % escaped_attrs

694

494

except TypeError as error:

740

540

raise

741

541

self.checker = None

742

542

743

744

543

def dbus_service_property(dbus_interface, signature="v",

745

544

access="readwrite", byte_arrays=False):

746

545

"""Decorators for marking methods of a DBusObjectWithProperties to

792

591

793

592

class DBusObjectWithProperties(dbus.service.Object):

794

593

"""A D-Bus object with properties.

795

594

796

595

Classes inheriting from this can use the dbus_service_property

797

596

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

798

597

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

805

604

def _get_all_dbus_properties(self):

806

605

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

807

606

"""

808

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

809

for cls in self.__class__.__mro__

607

return ((prop._dbus_name, prop)

810

608

for name, prop in

811

inspect.getmembers(cls, self._is_dbus_property))

609

inspect.getmembers(self, self._is_dbus_property))

812

610

813

611

def _get_dbus_property(self, interface_name, property_name):

814

612

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

815

613

property with the specified name and interface.

816

614

"""

817

for cls in self.__class__.__mro__:

818

for name, value in (inspect.getmembers

819

(cls, self._is_dbus_property)):

820

if (value._dbus_name == property_name

821

and value._dbus_interface == interface_name):

822

return value.__get__(self)

823

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

824

625

# No such property

825

626

raise DBusPropertyNotFound(self.dbus_object_path + ":"

826

627

+ interface_name + "."

851

652

# signatures other than "ay".

852

653

if prop._dbus_signature != "ay":

853

654

raise ValueError

854

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

855

for byte in value))

655

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

656

for byte in value))

856

657

prop(value)

857

658

858

659

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

860

661

def GetAll(self, interface_name):

861

662

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

862

663

standard.

863

664

864

665

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

865

666

"""

866

properties = {}

667

all = {}

867

668

for name, prop in self._get_all_dbus_properties():

868

669

if (interface_name

869

670

and interface_name != prop._dbus_interface):

874

675

continue

875

676

value = prop()

876

677

if not hasattr(value, "variant_level"):

877

properties[name] = value

678

all[name] = value

878

679

continue

879

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

880

value.variant_level+1)

881

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")

882

683

883

684

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

884

685

out_signature="s",

928

729

return xmlstring

929

730

930

731

931

def datetime_to_dbus (dt, variant_level=0):

932

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

933

if dt is None:

934

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

935

return dbus.String(dt.isoformat(),

936

variant_level=variant_level)

937

938

939

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

940

.__metaclass__):

941

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

942

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

943

"""

944

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

945

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

946

# methods, signals, or properties in them

947

for base in (b for b in bases

948

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

949

# Go though all attributes of the base class

950

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

951

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

952

# with the wrong interface name

953

if (not hasattr(attribute, "_dbus_interface")

954

or not attribute._dbus_interface

955

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

956

continue

957

# Create an alternate D-Bus interface name based on

958

# the current name

959

alt_interface = (attribute._dbus_interface

960

.replace("se.recompile.Mandos",

961

"se.bsnet.fukt.Mandos"))

962

# Is this a D-Bus signal?

963

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

964

# Extract the original non-method function by

965

# black magic

966

nonmethod_func = (dict(

967

zip(attribute.func_code.co_freevars,

968

attribute.__closure__))["func"]

969

.cell_contents)

970

# Create a new, but exactly alike, function

971

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

972

# with the alternate D-Bus interface name

973

new_function = (dbus.service.signal

974

(alt_interface,

975

attribute._dbus_signature)

976

(types.FunctionType(

977

nonmethod_func.func_code,

978

nonmethod_func.func_globals,

979

nonmethod_func.func_name,

980

nonmethod_func.func_defaults,

981

nonmethod_func.func_closure)))

982

# Define a creator of a function to call both the

983

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

984

# signals gets sent when the function is called

985

def fixscope(func1, func2):

986

"""This function is a scope container to pass

987

func1 and func2 to the "call_both" function

988

outside of its arguments"""

989

def call_both(*args, **kwargs):

990

"""This function will emit two D-Bus

991

signals by calling func1 and func2"""

992

func1(*args, **kwargs)

993

func2(*args, **kwargs)

994

return call_both

995

# Create the "call_both" function and add it to

996

# the class

997

attr[attrname] = fixscope(attribute,

998

new_function)

999

# Is this a D-Bus method?

1000

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

1001

# Create a new, but exactly alike, function

1002

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

1003

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

1004

# to the class.

1005

attr[attrname] = (dbus.service.method

1006

(alt_interface,

1007

attribute._dbus_in_signature,

1008

attribute._dbus_out_signature)

1009

(types.FunctionType

1010

(attribute.func_code,

1011

attribute.func_globals,

1012

attribute.func_name,

1013

attribute.func_defaults,

1014

attribute.func_closure)))

1015

# Is this a D-Bus property?

1016

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

1017

# Create a new, but exactly alike, function

1018

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

1019

# property with the alternate D-Bus interface

1020

# name. Add it to the class.

1021

attr[attrname] = (dbus_service_property

1022

(alt_interface,

1023

attribute._dbus_signature,

1024

attribute._dbus_access,

1025

attribute

1026

._dbus_get_args_options

1027

["byte_arrays"])

1028

(types.FunctionType

1029

(attribute.func_code,

1030

attribute.func_globals,

1031

attribute.func_name,

1032

attribute.func_defaults,

1033

attribute.func_closure)))

1034

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

1035

1036

1037

732

class ClientDBus(Client, DBusObjectWithProperties):

1038

733

"""A Client class using D-Bus

1039

734

1048

743

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

1049

744

1050

745

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

746

self._approvals_pending = 0

1051

747

self.bus = bus

1052

748

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

1053

749

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

1060

756

DBusObjectWithProperties.__init__(self, self.bus,

1061

757

self.dbus_object_path)

1062

758

1063

def notifychangeproperty(transform_func,

1064

dbus_name, type_func=lambda x: x,

1065

variant_level=1):

1066

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

1067

its changes to DBus.

1068

1069

transform_fun: Function that takes a value and a variant_level

1070

and transforms it to a D-Bus type.

1071

dbus_name: D-Bus name of the variable

1072

type_func: Function that transform the value before sending it

1073

to the D-Bus. Default: no transform

1074

variant_level: D-Bus variant level. Default: 1

1075

"""

1076

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

1077

def setter(self, value):

1078

if hasattr(self, "dbus_object_path"):

1079

if (not hasattr(self, attrname) or

1080

type_func(getattr(self, attrname, None))

1081

!= type_func(value)):

1082

dbus_value = transform_func(type_func(value),

1083

variant_level

1084

=variant_level)

1085

self.PropertyChanged(dbus.String(dbus_name),

1086

dbus_value)

1087

setattr(self, attrname, value)

1088

1089

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

1090

1091

1092

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1093

approvals_pending = notifychangeproperty(dbus.Boolean,

1094

"ApprovalPending",

1095

type_func = bool)

1096

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

1097

last_enabled = notifychangeproperty(datetime_to_dbus,

1098

"LastEnabled")

1099

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

1100

type_func = lambda checker:

1101

checker is not None)

1102

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1103

"LastCheckedOK")

1104

last_checker_status = notifychangeproperty(dbus.Int16,

1105

"LastCheckerStatus")

1106

last_approval_request = notifychangeproperty(

1107

datetime_to_dbus, "LastApprovalRequest")

1108

approved_by_default = notifychangeproperty(dbus.Boolean,

1109

"ApprovedByDefault")

1110

approval_delay = notifychangeproperty(dbus.UInt64,

1111

"ApprovalDelay",

1112

type_func =

1113

timedelta_to_milliseconds)

1114

approval_duration = notifychangeproperty(

1115

dbus.UInt64, "ApprovalDuration",

1116

type_func = timedelta_to_milliseconds)

1117

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

1118

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

1119

type_func =

1120

timedelta_to_milliseconds)

1121

extended_timeout = notifychangeproperty(

1122

dbus.UInt64, "ExtendedTimeout",

1123

type_func = timedelta_to_milliseconds)

1124

interval = notifychangeproperty(dbus.UInt64,

1125

"Interval",

1126

type_func =

1127

timedelta_to_milliseconds)

1128

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

1129

1130

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

1131

802

1132

803

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

1133

804

try:

1142

813

*args, **kwargs):

1143

814

self.checker_callback_tag = None

1144

815

self.checker = None

816

# Emit D-Bus signal

817

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

818

dbus.Boolean(False, variant_level=1))

1145

819

if os.WIFEXITED(condition):

1146

820

exitstatus = os.WEXITSTATUS(condition)

1147

821

# Emit D-Bus signal

1157

831

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

1158

832

*args, **kwargs)

1159

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

1160

851

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

1161

852

old_checker = self.checker

1162

853

if self.checker is not None:

1169

860

and old_checker_pid != self.checker.pid):

1170

861

# Emit D-Bus signal

1171

862

self.CheckerStarted(self.current_checker_command)

863

self.PropertyChanged(

864

dbus.String("CheckerRunning"),

865

dbus.Boolean(True, variant_level=1))

1172

866

return r

1173

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

1174

877

def _reset_approved(self):

1175

self.approved = None

878

self._approved = None

1176

879

return False

1177

880

1178

881

def approve(self, value=True):

1179

882

self.send_changedstate()

1180

self.approved = value

1181

gobject.timeout_add(timedelta_to_milliseconds

883

self._approved = value

884

gobject.timeout_add(self._timedelta_to_milliseconds

1182

885

(self.approval_duration),

1183

886

self._reset_approved)

1184

887

1185

888

1186

889

## D-Bus methods, signals & properties

1187

_interface = "se.recompile.Mandos.Client"

890

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

1188

891

1189

892

## Signals

1190

893

1276

979

if value is None: # get

1277

980

return dbus.Boolean(self.approved_by_default)

1278

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))

1279

985

1280

986

# ApprovalDelay - property

1281

987

@dbus_service_property(_interface, signature="t",

1284

990

if value is None: # get

1285

991

return dbus.UInt64(self.approval_delay_milliseconds())

1286

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))

1287

996

1288

997

# ApprovalDuration - property

1289

998

@dbus_service_property(_interface, signature="t",

1290

999

access="readwrite")

1291

1000

def ApprovalDuration_dbus_property(self, value=None):

1292

1001

if value is None: # get

1293

return dbus.UInt64(timedelta_to_milliseconds(

1002

return dbus.UInt64(self._timedelta_to_milliseconds(

1294

1003

self.approval_duration))

1295

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))

1296

1008

1297

1009

# Name - property

1298

1010

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

1310

1022

def Host_dbus_property(self, value=None):

1311

1023

if value is None: # get

1312

1024

return dbus.String(self.host)

1313

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))

1314

1029

1315

1030

# Created - property

1316

1031

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

1317

1032

def Created_dbus_property(self):

1318

return datetime_to_dbus(self.created)

1033

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

1319

1034

1320

1035

# LastEnabled - property

1321

1036

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

1322

1037

def LastEnabled_dbus_property(self):

1323

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))

1324

1041

1325

1042

# Enabled - property

1326

1043

@dbus_service_property(_interface, signature="b",

1340

1057

if value is not None:

1341

1058

self.checked_ok()

1342

1059

return

1343

return datetime_to_dbus(self.last_checked_ok)

1344

1345

# LastCheckerStatus - property

1346

@dbus_service_property(_interface, signature="n",

1347

access="read")

1348

def LastCheckerStatus_dbus_property(self):

1349

return dbus.Int16(self.last_checker_status)

1350

1351

# Expires - property

1352

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

1353

def Expires_dbus_property(self):

1354

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))

1355

1064

1356

1065

# LastApprovalRequest - property

1357

1066

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

1358

1067

def LastApprovalRequest_dbus_property(self):

1359

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))

1360

1073

1361

1074

# Timeout - property

1362

1075

@dbus_service_property(_interface, signature="t",

1365

1078

if value is None: # get

1366

1079

return dbus.UInt64(self.timeout_milliseconds())

1367

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

1368

1086

# Reschedule timeout

1369

if self.enabled:

1370

now = datetime.datetime.utcnow()

1371

time_to_die = timedelta_to_milliseconds(

1372

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

1373

if time_to_die <= 0:

1374

# The timeout has passed

1375

self.disable()

1376

else:

1377

self.expires = (now +

1378

datetime.timedelta(milliseconds =

1379

time_to_die))

1380

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

1381

is None):

1382

return

1383

gobject.source_remove(self.disable_initiator_tag)

1384

self.disable_initiator_tag = (gobject.timeout_add

1385

(time_to_die,

1386

self.disable))

1387

1388

# ExtendedTimeout - property

1389

@dbus_service_property(_interface, signature="t",

1390

access="readwrite")

1391

def ExtendedTimeout_dbus_property(self, value=None):

1392

if value is None: # get

1393

return dbus.UInt64(self.extended_timeout_milliseconds())

1394

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))

1395

1101

1396

1102

# Interval - property

1397

1103

@dbus_service_property(_interface, signature="t",

1400

1106

if value is None: # get

1401

1107

return dbus.UInt64(self.interval_milliseconds())

1402

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))

1403

1112

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

1404

1113

return

1405

if self.enabled:

1406

# Reschedule checker run

1407

gobject.source_remove(self.checker_initiator_tag)

1408

self.checker_initiator_tag = (gobject.timeout_add

1409

(value, self.start_checker))

1410

self.start_checker() # Start one now, too

1411

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

1412

1120

# Checker - property

1413

1121

@dbus_service_property(_interface, signature="s",

1414

1122

access="readwrite")

1415

1123

def Checker_dbus_property(self, value=None):

1416

1124

if value is None: # get

1417

1125

return dbus.String(self.checker_command)

1418

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))

1419

1131

1420

1132

# CheckerRunning - property

1421

1133

@dbus_service_property(_interface, signature="b",

1448

1160

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

1449

1161

if not self._pipe.recv():

1450

1162

raise KeyError()

1451

1163

1452

1164

def __getattribute__(self, name):

1453

if name == '_pipe':

1165

if(name == '_pipe'):

1454

1166

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

1455

1167

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

1456

1168

data = self._pipe.recv()

1461

1173

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

1462

1174

return self._pipe.recv()[1]

1463

1175

return func

1464

1176

1465

1177

def __setattr__(self, name, value):

1466

if name == '_pipe':

1178

if(name == '_pipe'):

1467

1179

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

1468

1180

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

1469

1181

1470

1182

1471

class ClientDBusTransitional(ClientDBus):

1472

__metaclass__ = AlternateDBusNamesMetaclass

1473

1474

1475

1183

class ClientHandler(socketserver.BaseRequestHandler, object):

1476

1184

"""A class to handle client connections.

1477

1185

1484

1192

unicode(self.client_address))

1485

1193

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

1486

1194

self.server.child_pipe.fileno())

1487

1195

1488

1196

session = (gnutls.connection

1489

1197

.ClientSession(self.request,

1490

1198

gnutls.connection

1491

1199

.X509Credentials()))

1492

1200

1493

1201

# Note: gnutls.connection.X509Credentials is really a

1494

1202

# generic GnuTLS certificate credentials object so long as

1495

1203

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

1496

1204

# here despite using OpenPGP certificates.

1497

1205

1498

1206

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

1499

1207

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

1500

1208

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

1506

1214

(gnutls.library.functions

1507

1215

.gnutls_priority_set_direct(session._c_object,

1508

1216

priority, None))

1509

1217

1510

1218

# Start communication using the Mandos protocol

1511

1219

# Get protocol number

1512

1220

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

1517

1225

except (ValueError, IndexError, RuntimeError) as error:

1518

1226

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

1519

1227

return

1520

1228

1521

1229

# Start GnuTLS connection

1522

1230

try:

1523

1231

session.handshake()

1527

1235

# established. Just abandon the request.

1528

1236

return

1529

1237

logger.debug("Handshake succeeded")

1530

1238

1531

1239

approval_required = False

1532

1240

try:

1533

1241

try:

1538

1246

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

1539

1247

return

1540

1248

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

1541

1249

1542

1250

try:

1543

1251

client = ProxyClient(child_pipe, fpr,

1544

1252

self.client_address)

1552

1260

1553

1261

while True:

1554

1262

if not client.enabled:

1555

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

1263

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

1556

1264

client.name)

1557

1265

if self.server.use_dbus:

1558

1266

# Emit D-Bus signal

1559

client.Rejected("Disabled")

1267

client.Rejected("Disabled")

1560

1268

return

1561

1269

1562

if client.approved or not client.approval_delay:

1270

if client._approved or not client.approval_delay:

1563

1271

#We are approved or approval is disabled

1564

1272

break

1565

elif client.approved is None:

1273

elif client._approved is None:

1566

1274

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

1567

1275

client.name)

1568

1276

if self.server.use_dbus:

1579

1287

return

1580

1288

1581

1289

#wait until timeout or approved

1290

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

1582

1291

time = datetime.datetime.now()

1583

1292

client.changedstate.acquire()

1584

(client.changedstate.wait

1585

(float(client.timedelta_to_milliseconds(delay)

1586

/ 1000)))

1293

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

1587

1294

client.changedstate.release()

1588

1295

time2 = datetime.datetime.now()

1589

1296

if (time2 - time) >= delay:

1611

1318

sent, len(client.secret)

1612

1319

- (sent_size + sent))

1613

1320

sent_size += sent

1614

1321

1615

1322

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

1616

# bump the timeout using extended_timeout

1617

client.bump_timeout(client.extended_timeout)

1323

# bump the timeout as if seen

1324

client.checked_ok()

1618

1325

if self.server.use_dbus:

1619

1326

# Emit D-Bus signal

1620

1327

client.GotSecret()

1687

1394

# Convert the buffer to a Python bytestring

1688

1395

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

1689

1396

# Convert the bytestring to hexadecimal notation

1690

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

1397

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

1691

1398

return hex_fpr

1692

1399

1693

1400

1696

1403

def sub_process_main(self, request, address):

1697

1404

try:

1698

1405

self.finish_request(request, address)

1699

except Exception:

1406

except:

1700

1407

self.handle_error(request, address)

1701

1408

self.close_request(request)

1702

1409

1703

1410

def process_request(self, request, address):

1704

1411

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

1705

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

1706

args = (request,

1707

address))

1708

proc.start()

1709

return proc

1710

1412

multiprocessing.Process(target = self.sub_process_main,

1413

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

1711

1414

1712

1415

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1713

1416

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

1717

1420

This function creates a new pipe in self.pipe

1718

1421

"""

1719

1422

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1720

1721

proc = MultiprocessingMixIn.process_request(self, request,

1722

client_address)

1423

1424

super(MultiprocessingMixInWithPipe,

1425

self).process_request(request, client_address)

1723

1426

self.child_pipe.close()

1724

self.add_pipe(parent_pipe, proc)

1725

1726

def add_pipe(self, parent_pipe, proc):

1427

self.add_pipe(parent_pipe)

1428

1429

def add_pipe(self, parent_pipe):

1727

1430

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

1728

1431

raise NotImplementedError

1729

1432

1730

1731

1433

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1732

1434

socketserver.TCPServer, object):

1733

1435

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

1807

1509

self.enabled = False

1808

1510

self.clients = clients

1809

1511

if self.clients is None:

1810

self.clients = {}

1512

self.clients = set()

1811

1513

self.use_dbus = use_dbus

1812

1514

self.gnutls_priority = gnutls_priority

1813

1515

IPv6_TCPServer.__init__(self, server_address,

1817

1519

def server_activate(self):

1818

1520

if self.enabled:

1819

1521

return socketserver.TCPServer.server_activate(self)

1820

1821

1522

def enable(self):

1822

1523

self.enabled = True

1823

1824

def add_pipe(self, parent_pipe, proc):

1524

def add_pipe(self, parent_pipe):

1825

1525

# Call "handle_ipc" for both data and EOF events

1826

1526

gobject.io_add_watch(parent_pipe.fileno(),

1827

1527

gobject.IO_IN | gobject.IO_HUP,

1828

1528

functools.partial(self.handle_ipc,

1829

parent_pipe =

1830

parent_pipe,

1831

proc = proc))

1832

1529

parent_pipe = parent_pipe))

1530

1833

1531

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

1834

proc = None, client_object=None):

1532

client_object=None):

1835

1533

condition_names = {

1836

1534

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

1837

1535

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

1846

1544

for cond, name in

1847

1545

condition_names.iteritems()

1848

1546

if cond & condition)

1849

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

1547

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

1850

1548

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

1851

# Wait for other process to exit

1852

proc.join()

1853

1549

return False

1854

1550

1855

1551

# Read a request from the child

1860

1556

fpr = request[1]

1861

1557

address = request[2]

1862

1558

1863

for c in self.clients.itervalues():

1559

for c in self.clients:

1864

1560

if c.fingerprint == fpr:

1865

1561

client = c

1866

1562

break

1867

1563

else:

1868

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

1869

"dress: %s", fpr, address)

1564

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

1565

"dress: %s", fpr, address)

1870

1566

if self.use_dbus:

1871

1567

# Emit D-Bus signal

1872

mandos_dbus_service.ClientNotFound(fpr,

1873

address[0])

1568

mandos_dbus_service.ClientNotFound(fpr, address[0])

1874

1569

parent_pipe.send(False)

1875

1570

return False

1876

1571

1877

1572

gobject.io_add_watch(parent_pipe.fileno(),

1878

1573

gobject.IO_IN | gobject.IO_HUP,

1879

1574

functools.partial(self.handle_ipc,

1880

parent_pipe =

1881

parent_pipe,

1882

proc = proc,

1883

client_object =

1884

client))

1575

parent_pipe = parent_pipe,

1576

client_object = client))

1885

1577

parent_pipe.send(True)

1886

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

1887

# same fileno

1578

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

1888

1579

return False

1889

1580

if command == 'funcall':

1890

1581

funcname = request[1]

1891

1582

args = request[2]

1892

1583

kwargs = request[3]

1893

1584

1894

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

1895

funcname)(*args,

1896

**kwargs)))

1897

1585

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

1586

1898

1587

if command == 'getattr':

1899

1588

attrname = request[1]

1900

1589

if callable(client_object.__getattribute__(attrname)):

1901

1590

parent_pipe.send(('function',))

1902

1591

else:

1903

parent_pipe.send(('data', client_object

1904

.__getattribute__(attrname)))

1592

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

1905

1593

1906

1594

if command == 'setattr':

1907

1595

attrname = request[1]

1908

1596

value = request[2]

1909

1597

setattr(client_object, attrname, value)

1910

1598

1911

1599

return True

1912

1600

1913

1601

1950

1638

return timevalue

1951

1639

1952

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

1953

1665

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

1954

1666

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

1955

1667

2010

1722

" system bus interface")

2011

1723

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

2012

1724

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

2013

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

2014

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

2015

" state")

2016

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

2017

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

2018

2019

1725

options = parser.parse_args()

2020

1726

2021

1727

if options.check:

2034

1740

"use_dbus": "True",

2035

1741

"use_ipv6": "True",

2036

1742

"debuglevel": "",

2037

"restore": "True",

2038

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

2039

1743

}

2040

1744

2041

1745

# Parse config file for server-global settings

2058

1762

# options, if set.

2059

1763

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

2060

1764

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

2061

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

2062

"statedir"):

1765

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

2063

1766

value = getattr(options, option)

2064

1767

if value is not None:

2065

1768

server_settings[option] = value

2077

1780

debuglevel = server_settings["debuglevel"]

2078

1781

use_dbus = server_settings["use_dbus"]

2079

1782

use_ipv6 = server_settings["use_ipv6"]

2080

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

2081

stored_state_file)

2082

2083

if debug:

2084

initlogger(debug, logging.DEBUG)

2085

else:

2086

if not debuglevel:

2087

initlogger(debug)

2088

else:

2089

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

2090

initlogger(debug, level)

2091

1783

2092

1784

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

2093

1785

syslogger.setFormatter(logging.Formatter

2094

1786

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

2096

1788

% server_settings["servicename"]))

2097

1789

2098

1790

# Parse config file with clients

2099

client_config = configparser.SafeConfigParser(Client

2100

.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)

2101

1799

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

2102

1800

"clients.conf"))

2103

1801

2141

1839

if error[0] != errno.EPERM:

2142

1840

raise error

2143

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

2144

1850

if debug:

2145

1851

# Enable all possible GnuTLS debugging

2146

1852

2160

1866

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

2161

1867

if null > 2:

2162

1868

os.close(null)

1869

else:

1870

# No console logging

1871

logger.removeHandler(console)

2163

1872

2164

1873

# Need to fork before connecting to D-Bus

2165

1874

if not debug:

2166

1875

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

2167

1876

daemon()

2168

1877

2169

gobject.threads_init()

2170

2171

1878

global main_loop

2172

1879

# From the Avahi example code

2173

1880

DBusGMainLoop(set_as_default=True )

2176

1883

# End of Avahi example code

2177

1884

if use_dbus:

2178

1885

try:

2179

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

1886

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

2180

1887

bus, do_not_queue=True)

2181

old_bus_name = (dbus.service.BusName

2182

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

2183

do_not_queue=True))

2184

1888

except dbus.exceptions.NameExistsException as e:

2185

1889

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

2186

1890

use_dbus = False

2187

1891

server_settings["use_dbus"] = False

2188

1892

tcp_server.use_dbus = False

2189

1893

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2190

service = AvahiServiceToSyslog(name =

2191

server_settings["servicename"],

2192

servicetype = "_mandos._tcp",

2193

protocol = protocol, bus = bus)

1894

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

1895

servicetype = "_mandos._tcp",

1896

protocol = protocol, bus = bus)

2194

1897

if server_settings["interface"]:

2195

1898

service.interface = (if_nametoindex

2196

1899

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

2200

1903

2201

1904

client_class = Client

2202

1905

if use_dbus:

2203

client_class = functools.partial(ClientDBusTransitional,

2204

bus = bus)

2205

2206

client_settings = Client.config_parser(client_config)

2207

old_client_settings = {}

2208

clients_data = {}

2209

2210

# Get client data and settings from last running state.

2211

if server_settings["restore"]:

2212

try:

2213

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

2214

clients_data, old_client_settings = (pickle.load

2215

(stored_state))

2216

os.remove(stored_state_path)

2217

except IOError as e:

2218

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

2219

.format(e))

2220

if e.errno != errno.ENOENT:

2221

raise

2222

except EOFError as e:

2223

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

2224

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

2225

2226

with PGPEngine() as pgp:

2227

for client_name, client in clients_data.iteritems():

2228

# Decide which value to use after restoring saved state.

2229

# We have three different values: Old config file,

2230

# new config file, and saved state.

2231

# New config value takes precedence if it differs from old

2232

# config value, otherwise use saved state.

2233

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

2234

try:

2235

# For each value in new config, check if it

2236

# differs from the old config value (Except for

2237

# the "secret" attribute)

2238

if (name != "secret" and

2239

value != old_client_settings[client_name]

2240

[name]):

2241

client[name] = value

2242

except KeyError:

2243

pass

2244

2245

# Clients who has passed its expire date can still be

2246

# enabled if its last checker was successful. Clients

2247

# whose checker succeeded before we stored its state is

2248

# assumed to have successfully run all checkers during

2249

# downtime.

2250

if client["enabled"]:

2251

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

2252

if not client["last_checked_ok"]:

2253

logger.warning(

2254

"disabling client {0} - Client never "

2255

"performed a successful checker"

2256

.format(client_name))

2257

client["enabled"] = False

2258

elif client["last_checker_status"] != 0:

2259

logger.warning(

2260

"disabling client {0} - Client "

2261

"last checker failed with error code {1}"

2262

.format(client_name,

2263

client["last_checker_status"]))

2264

client["enabled"] = False

2265

else:

2266

client["expires"] = (datetime.datetime

2267

.utcnow()

2268

+ client["timeout"])

2269

logger.debug("Last checker succeeded,"

2270

" keeping {0} enabled"

2271

.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):

2272

1914

try:

2273

client["secret"] = (

2274

pgp.decrypt(client["encrypted_secret"],

2275

client_settings[client_name]

2276

["secret"]))

2277

except PGPError:

2278

# If decryption fails, we use secret from new settings

2279

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

2280

.format(client_name))

2281

client["secret"] = (

2282

client_settings[client_name]["secret"])

2283

2284

2285

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

2286

for client_name in (set(old_client_settings)

2287

- set(client_settings)):

2288

del clients_data[client_name]

2289

for client_name in (set(client_settings)

2290

- set(old_client_settings)):

2291

clients_data[client_name] = client_settings[client_name]

2292

2293

# Create all client objects

2294

for client_name, client in clients_data.iteritems():

2295

tcp_server.clients[client_name] = client_class(

2296

name = client_name, settings = client)

2297

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()))

2298

1924

if not tcp_server.clients:

2299

1925

logger.warning("No clients defined")

2300

1926

2311

1937

# "pidfile" was never created

2312

1938

pass

2313

1939

del pidfilename

1940

2314

1941

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

2315

1942

2316

1943

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

2317

1944

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

2318

1945

2321

1948

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

2322

1949

def __init__(self):

2323

1950

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

2324

_interface = "se.recompile.Mandos"

1951

_interface = "se.bsnet.fukt.Mandos"

2325

1952

2326

1953

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

2327

1954

def ClientAdded(self, objpath):

2342

1969

def GetAllClients(self):

2343

1970

"D-Bus method"

2344

1971

return dbus.Array(c.dbus_object_path

2345

for c in

2346

tcp_server.clients.itervalues())

1972

for c in tcp_server.clients)

2347

1973

2348

1974

@dbus.service.method(_interface,

2349

1975

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

2351

1977

"D-Bus method"

2352

1978

return dbus.Dictionary(

2353

1979

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

2354

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

1980

for c in tcp_server.clients),

2355

1981

signature="oa{sv}")

2356

1982

2357

1983

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

2358

1984

def RemoveClient(self, object_path):

2359

1985

"D-Bus method"

2360

for c in tcp_server.clients.itervalues():

1986

for c in tcp_server.clients:

2361

1987

if c.dbus_object_path == object_path:

2362

del tcp_server.clients[c.name]

1988

tcp_server.clients.remove(c)

2363

1989

c.remove_from_connection()

2364

1990

# Don't signal anything except ClientRemoved

2365

1991

c.disable(quiet=True)

2370

1996

2371

1997

del _interface

2372

1998

2373

class MandosDBusServiceTransitional(MandosDBusService):

2374

__metaclass__ = AlternateDBusNamesMetaclass

2375

mandos_dbus_service = MandosDBusServiceTransitional()

1999

mandos_dbus_service = MandosDBusService()

2376

2000

2377

2001

def cleanup():

2378

2002

"Cleanup function; run on exit"

2379

2003

service.cleanup()

2380

2004

2381

multiprocessing.active_children()

2382

if not (tcp_server.clients or client_settings):

2383

return

2384

2385

# Store client before exiting. Secrets are encrypted with key

2386

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

2387

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

2388

clients = {}

2389

with PGPEngine() as pgp:

2390

for client in tcp_server.clients.itervalues():

2391

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

2392

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

2393

key)

2394

client_dict = {}

2395

2396

# A list of attributes that can not be pickled

2397

# + secret.

2398

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

2399

"checker"))

2400

for name, typ in (inspect.getmembers

2401

(dbus.service.Object)):

2402

exclude.add(name)

2403

2404

client_dict["encrypted_secret"] = (client

2405

.encrypted_secret)

2406

for attr in client.client_structure:

2407

if attr not in exclude:

2408

client_dict[attr] = getattr(client, attr)

2409

2410

clients[client.name] = client_dict

2411

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

2412

2413

try:

2414

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

2415

prefix="clients-",

2416

dir=os.path.dirname

2417

(stored_state_path))

2418

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

2419

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

2420

os.rename(tempname, stored_state_path)

2421

except (IOError, OSError) as e:

2422

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

2423

.format(e))

2424

if not debug:

2425

try:

2426

os.remove(tempname)

2427

except NameError:

2428

pass

2429

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

2430

errno.EEXIST)):

2431

raise e

2432

2433

# Delete all clients, and settings from config

2434

2005

while tcp_server.clients:

2435

name, client = tcp_server.clients.popitem()

2006

client = tcp_server.clients.pop()

2436

2007

if use_dbus:

2437

2008

client.remove_from_connection()

2009

client.disable_hook = None

2438

2010

# Don't signal anything except ClientRemoved

2439

2011

client.disable(quiet=True)

2440

2012

if use_dbus:

2441

2013

# Emit D-Bus signal

2442

mandos_dbus_service.ClientRemoved(client

2443

.dbus_object_path,

2014

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2444

2015

client.name)

2445

client_settings.clear()

2446

2016

2447

2017

atexit.register(cleanup)

2448

2018

2449

for client in tcp_server.clients.itervalues():

2019

for client in tcp_server.clients:

2450

2020

if use_dbus:

2451

2021

# Emit D-Bus signal

2452

2022

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2453

# Need to initiate checking of clients

2454

if client.enabled:

2455

client.init_checker()

2023

client.enable()

2456

2024

2457

2025

tcp_server.enable()

2458

2026

tcp_server.server_activate()