/mandos/trunk : revision 549

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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@fukt.bsnet.se>.

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

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#

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from __future__ import (division, absolute_import, print_function,

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import 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 = "1.3.0"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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version = "1.5.0"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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

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.if_nametoindex)

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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

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

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

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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

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interface))

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

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ifreq[16:20])[0]

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return interface_index

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def initlogger(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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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.GetAlternativeServiceName(self.name))

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self.name = unicode(self.server

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.GetAlternativeServiceName(self.name))

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

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self.name)

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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self.remove()

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try:

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self.add()

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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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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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if self.group is None:

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self.group = dbus.Interface(

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self.bus.get_object(avahi.DBUS_NAME,

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self.server.EntryGroupNew()),

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.entry_group_state_changed_match = (

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self.group.connect_to_signal(

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'StateChanged', self .entry_group_state_changed))

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'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]:

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logger.error(bad_states[state])

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self.remove()

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if bad_states[state] is not None:

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if error is None:

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logger.error(bad_states[state])

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else:

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

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self.cleanup()

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elif state == avahi.SERVER_RUNNING:

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self.add()

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else:

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

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if error is None:

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

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else:

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

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def activate(self):

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

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if self.server is None:

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self.server_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_enabled: datetime.datetime(); (UTC)

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, or None.

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

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when password has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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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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@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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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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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return self._timedelta_to_milliseconds(self.timeout)

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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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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return self._timedelta_to_milliseconds(self.interval)

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return timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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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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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")

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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)

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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"]

502

client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = None

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return settings

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

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

320

511

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

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attribute."""

322

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self.name = name

323

if config is None:

324

config = {}

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# adding all client settings

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for setting, value in settings.iteritems():

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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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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()

328

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# function

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

330

.replace(" ", ""))

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532

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

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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", "")

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

348

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

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

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self.disable_hook = disable_hook

533

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

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datetime.datetime.utcnow())

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# attributes specific for this server instance

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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

357

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)

542

self.approved = None

361

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self.approvals_pending = 0

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self.approval_delay = string_to_delta(

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config["approval_delay"])

364

self.approval_duration = string_to_delta(

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config["approval_duration"])

366

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

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)

367

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559

# Send notice to process children that client state has changed

368

560

def send_changedstate(self):

369

self.changedstate.acquire()

370

self.changedstate.notify_all()

371

self.changedstate.release()

372

561

with self.changedstate:

562

self.changedstate.notify_all()

563

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564

def enable(self):

374

565

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

375

566

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

376

567

# Already enabled

377

568

return

378

569

self.send_changedstate()

570

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

571

self.enabled = True

379

572

self.last_enabled = datetime.datetime.utcnow()

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(),

384

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()

573

self.init_checker()

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def disable(self, quiet=True):

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"""Disable this client."""

401

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

402

584

gobject.source_remove(self.disable_initiator_tag)

403

585

self.disable_initiator_tag = None

586

self.expires = None

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

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gobject.source_remove(self.checker_initiator_tag)

406

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self.checker_initiator_tag = None

407

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self.stop_checker()

408

if self.disable_hook:

409

self.disable_hook(self)

410

591

self.enabled = False

411

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

412

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return False

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414

595

def __del__(self):

415

self.disable_hook = None

416

596

self.disable()

417

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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(),

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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

418

611

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

419

612

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

420

613

self.checker_callback_tag = None

421

614

self.checker = None

422

615

if os.WIFEXITED(condition):

423

exitstatus = os.WEXITSTATUS(condition)

424

if exitstatus == 0:

616

self.last_checker_status = os.WEXITSTATUS(condition)

617

if self.last_checker_status == 0:

425

618

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

426

619

vars(self))

427

620

self.checked_ok()

429

622

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

430

623

vars(self))

431

624

else:

625

self.last_checker_status = -1

432

626

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

433

627

vars(self))

434

628

435

def checked_ok(self):

629

def checked_ok(self, timeout=None):

436

630

"""Bump up the timeout for this client.

437

631

438

632

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

439

633

alive and well.

440

634

"""

635

if timeout is None:

636

timeout = self.timeout

441

637

self.last_checked_ok = datetime.datetime.utcnow()

442

gobject.source_remove(self.disable_initiator_tag)

443

self.disable_initiator_tag = (gobject.timeout_add

444

(self.timeout_milliseconds(),

445

self.disable))

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

446

645

447

646

def need_approval(self):

448

647

self.last_approval_request = datetime.datetime.utcnow()

488

687

'replace')))

489

688

for attr in

490

689

self.runtime_expansions)

491

690

492

691

try:

493

692

command = self.checker_command % escaped_attrs

494

693

except TypeError as error:

540

739

raise

541

740

self.checker = None

542

741

742

543

743

def dbus_service_property(dbus_interface, signature="v",

544

744

access="readwrite", byte_arrays=False):

545

745

"""Decorators for marking methods of a DBusObjectWithProperties to

591

791

592

792

class DBusObjectWithProperties(dbus.service.Object):

593

793

"""A D-Bus object with properties.

594

794

595

795

Classes inheriting from this can use the dbus_service_property

596

796

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

597

797

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

604

804

def _get_all_dbus_properties(self):

605

805

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

606

806

"""

607

return ((prop._dbus_name, prop)

807

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

808

for cls in self.__class__.__mro__

608

809

for name, prop in

609

inspect.getmembers(self, self._is_dbus_property))

810

inspect.getmembers(cls, self._is_dbus_property))

610

811

611

812

def _get_dbus_property(self, interface_name, property_name):

612

813

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

613

814

property with the specified name and interface.

614

815

"""

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

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

625

823

# No such property

626

824

raise DBusPropertyNotFound(self.dbus_object_path + ":"

627

825

+ interface_name + "."

652

850

# signatures other than "ay".

653

851

if prop._dbus_signature != "ay":

654

852

raise ValueError

655

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

656

for byte in value))

853

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

854

for byte in value))

657

855

prop(value)

658

856

659

857

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

661

859

def GetAll(self, interface_name):

662

860

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

663

861

standard.

664

862

665

863

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

666

864

"""

667

all = {}

865

properties = {}

668

866

for name, prop in self._get_all_dbus_properties():

669

867

if (interface_name

670

868

and interface_name != prop._dbus_interface):

675

873

continue

676

874

value = prop()

677

875

if not hasattr(value, "variant_level"):

678

all[name] = value

876

properties[name] = value

679

877

continue

680

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

681

value.variant_level+1)

682

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

878

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

879

value.variant_level+1)

880

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

683

881

684

882

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

685

883

out_signature="s",

729

927

return xmlstring

730

928

731

929

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

732

1036

class ClientDBus(Client, DBusObjectWithProperties):

733

1037

"""A Client class using D-Bus

734

1038

743

1047

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

744

1048

745

1049

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

746

self._approvals_pending = 0

747

1050

self.bus = bus

748

1051

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

1052

self._approvals_pending = 0

1053

1054

self._approvals_pending = 0

749

1055

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

750

1056

# the D-Bus

751

1057

client_object_name = unicode(self.name).translate(

756

1062

DBusObjectWithProperties.__init__(self, self.bus,

757

1063

self.dbus_object_path)

758

1064

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

1065

def notifychangeproperty(transform_func,

1066

dbus_name, type_func=lambda x: x,

1067

variant_level=1):

1068

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

1069

its changes to DBus.

1070

1071

transform_fun: Function that takes a value and a variant_level

1072

and transforms it to a D-Bus type.

1073

dbus_name: D-Bus name of the variable

1074

type_func: Function that transform the value before sending it

1075

to the D-Bus. Default: no transform

1076

variant_level: D-Bus variant level. Default: 1

1077

"""

1078

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

1079

def setter(self, value):

1080

if hasattr(self, "dbus_object_path"):

1081

if (not hasattr(self, attrname) or

1082

type_func(getattr(self, attrname, None))

1083

!= type_func(value)):

1084

dbus_value = transform_func(type_func(value),

1085

variant_level

1086

=variant_level)

1087

self.PropertyChanged(dbus.String(dbus_name),

1088

dbus_value)

1089

setattr(self, attrname, value)

1090

1091

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

1092

1093

1094

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1095

approvals_pending = notifychangeproperty(dbus.Boolean,

1096

"ApprovalPending",

1097

type_func = bool)

1098

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

1099

last_enabled = notifychangeproperty(datetime_to_dbus,

1100

"LastEnabled")

1101

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

1102

type_func = lambda checker:

1103

checker is not None)

1104

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1105

"LastCheckedOK")

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

802

1131

803

1132

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

804

1133

try:

813

1142

*args, **kwargs):

814

1143

self.checker_callback_tag = None

815

1144

self.checker = None

816

# Emit D-Bus signal

817

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

818

dbus.Boolean(False, variant_level=1))

819

1145

if os.WIFEXITED(condition):

820

1146

exitstatus = os.WEXITSTATUS(condition)

821

1147

# Emit D-Bus signal

831

1157

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

832

1158

*args, **kwargs)

833

1159

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

851

1160

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

852

1161

old_checker = self.checker

853

1162

if self.checker is not None:

860

1169

and old_checker_pid != self.checker.pid):

861

1170

# Emit D-Bus signal

862

1171

self.CheckerStarted(self.current_checker_command)

863

self.PropertyChanged(

864

dbus.String("CheckerRunning"),

865

dbus.Boolean(True, variant_level=1))

866

1172

return r

867

1173

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

877

1174

def _reset_approved(self):

878

self._approved = None

1175

self.approved = None

879

1176

return False

880

1177

881

1178

def approve(self, value=True):

882

1179

self.send_changedstate()

883

self._approved = value

884

gobject.timeout_add(self._timedelta_to_milliseconds

1180

self.approved = value

1181

gobject.timeout_add(timedelta_to_milliseconds

885

1182

(self.approval_duration),

886

1183

self._reset_approved)

887

1184

888

1185

889

1186

## D-Bus methods, signals & properties

890

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

1187

_interface = "se.recompile.Mandos.Client"

891

1188

892

1189

## Signals

893

1190

930

1227

"D-Bus signal"

931

1228

return self.need_approval()

932

1229

1230

# NeRwequest - signal

1231

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

1232

def NewRequest(self, ip):

1233

"""D-Bus signal

1234

Is sent after a client request a password.

1235

"""

1236

pass

1237

933

1238

## Methods

934

1239

935

1240

# Approve - method

979

1284

if value is None: # get

980

1285

return dbus.Boolean(self.approved_by_default)

981

1286

self.approved_by_default = bool(value)

982

# Emit D-Bus signal

983

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

984

dbus.Boolean(value, variant_level=1))

985

1287

986

1288

# ApprovalDelay - property

987

1289

@dbus_service_property(_interface, signature="t",

990

1292

if value is None: # get

991

1293

return dbus.UInt64(self.approval_delay_milliseconds())

992

1294

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))

996

1295

997

1296

# ApprovalDuration - property

998

1297

@dbus_service_property(_interface, signature="t",

999

1298

access="readwrite")

1000

1299

def ApprovalDuration_dbus_property(self, value=None):

1001

1300

if value is None: # get

1002

return dbus.UInt64(self._timedelta_to_milliseconds(

1301

return dbus.UInt64(timedelta_to_milliseconds(

1003

1302

self.approval_duration))

1004

1303

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))

1008

1304

1009

1305

# Name - property

1010

1306

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

1022

1318

def Host_dbus_property(self, value=None):

1023

1319

if value is None: # get

1024

1320

return dbus.String(self.host)

1025

self.host = value

1026

# Emit D-Bus signal

1027

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

1028

dbus.String(value, variant_level=1))

1321

self.host = unicode(value)

1029

1322

1030

1323

# Created - property

1031

1324

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

1032

1325

def Created_dbus_property(self):

1033

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

1326

return datetime_to_dbus(self.created)

1034

1327

1035

1328

# LastEnabled - property

1036

1329

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

1037

1330

def LastEnabled_dbus_property(self):

1038

if self.last_enabled is None:

1039

return dbus.String("")

1040

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

1331

return datetime_to_dbus(self.last_enabled)

1041

1332

1042

1333

# Enabled - property

1043

1334

@dbus_service_property(_interface, signature="b",

1057

1348

if value is not None:

1058

1349

self.checked_ok()

1059

1350

return

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))

1351

return datetime_to_dbus(self.last_checked_ok)

1352

1353

# Expires - property

1354

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

1355

def Expires_dbus_property(self):

1356

return datetime_to_dbus(self.expires)

1064

1357

1065

1358

# LastApprovalRequest - property

1066

1359

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

1067

1360

def LastApprovalRequest_dbus_property(self):

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))

1361

return datetime_to_dbus(self.last_approval_request)

1073

1362

1074

1363

# Timeout - property

1075

1364

@dbus_service_property(_interface, signature="t",

1078

1367

if value is None: # get

1079

1368

return dbus.UInt64(self.timeout_milliseconds())

1080

1369

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

1086

1370

# Reschedule timeout

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))

1371

if self.enabled:

1372

now = datetime.datetime.utcnow()

1373

time_to_die = timedelta_to_milliseconds(

1374

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

1375

if time_to_die <= 0:

1376

# The timeout has passed

1377

self.disable()

1378

else:

1379

self.expires = (now +

1380

datetime.timedelta(milliseconds =

1381

time_to_die))

1382

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

1383

is None):

1384

return

1385

gobject.source_remove(self.disable_initiator_tag)

1386

self.disable_initiator_tag = (gobject.timeout_add

1387

(time_to_die,

1388

self.disable))

1389

1390

# ExtendedTimeout - property

1391

@dbus_service_property(_interface, signature="t",

1392

access="readwrite")

1393

def ExtendedTimeout_dbus_property(self, value=None):

1394

if value is None: # get

1395

return dbus.UInt64(self.extended_timeout_milliseconds())

1396

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

1101

1397

1102

1398

# Interval - property

1103

1399

@dbus_service_property(_interface, signature="t",

1106

1402

if value is None: # get

1107

1403

return dbus.UInt64(self.interval_milliseconds())

1108

1404

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))

1112

1405

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

1113

1406

return

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

1407

if self.enabled:

1408

# Reschedule checker run

1409

gobject.source_remove(self.checker_initiator_tag)

1410

self.checker_initiator_tag = (gobject.timeout_add

1411

(value, self.start_checker))

1412

self.start_checker() # Start one now, too

1413

1120

1414

# Checker - property

1121

1415

@dbus_service_property(_interface, signature="s",

1122

1416

access="readwrite")

1123

1417

def Checker_dbus_property(self, value=None):

1124

1418

if value is None: # get

1125

1419

return dbus.String(self.checker_command)

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))

1420

self.checker_command = unicode(value)

1131

1421

1132

1422

# CheckerRunning - property

1133

1423

@dbus_service_property(_interface, signature="b",

1160

1450

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

1161

1451

if not self._pipe.recv():

1162

1452

raise KeyError()

1163

1453

1164

1454

def __getattribute__(self, name):

1165

if(name == '_pipe'):

1455

if name == '_pipe':

1166

1456

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

1167

1457

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

1168

1458

data = self._pipe.recv()

1173

1463

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

1174

1464

return self._pipe.recv()[1]

1175

1465

return func

1176

1466

1177

1467

def __setattr__(self, name, value):

1178

if(name == '_pipe'):

1468

if name == '_pipe':

1179

1469

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

1180

1470

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

1181

1471

1182

1472

1473

class ClientDBusTransitional(ClientDBus):

1474

__metaclass__ = AlternateDBusNamesMetaclass

1475

1476

1183

1477

class ClientHandler(socketserver.BaseRequestHandler, object):

1184

1478

"""A class to handle client connections.

1185

1479

1192

1486

unicode(self.client_address))

1193

1487

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

1194

1488

self.server.child_pipe.fileno())

1195

1489

1196

1490

session = (gnutls.connection

1197

1491

.ClientSession(self.request,

1198

1492

gnutls.connection

1199

1493

.X509Credentials()))

1200

1494

1201

1495

# Note: gnutls.connection.X509Credentials is really a

1202

1496

# generic GnuTLS certificate credentials object so long as

1203

1497

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

1204

1498

# here despite using OpenPGP certificates.

1205

1499

1206

1500

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

1207

1501

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

1208

1502

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

1214

1508

(gnutls.library.functions

1215

1509

.gnutls_priority_set_direct(session._c_object,

1216

1510

priority, None))

1217

1511

1218

1512

# Start communication using the Mandos protocol

1219

1513

# Get protocol number

1220

1514

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

1225

1519

except (ValueError, IndexError, RuntimeError) as error:

1226

1520

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

1227

1521

return

1228

1522

1229

1523

# Start GnuTLS connection

1230

1524

try:

1231

1525

session.handshake()

1235

1529

# established. Just abandon the request.

1236

1530

return

1237

1531

logger.debug("Handshake succeeded")

1238

1532

1239

1533

approval_required = False

1240

1534

try:

1241

1535

try:

1246

1540

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

1247

1541

return

1248

1542

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

1249

1543

1250

1544

try:

1251

1545

client = ProxyClient(child_pipe, fpr,

1252

1546

self.client_address)

1253

1547

except KeyError:

1254

1548

return

1255

1549

1550

if self.server.use_dbus:

1551

# Emit D-Bus signal

1552

client.NewRequest(str(self.client_address))

1553

1256

1554

if client.approval_delay:

1257

1555

delay = client.approval_delay

1258

1556

client.approvals_pending += 1

1260

1558

1261

1559

while True:

1262

1560

if not client.enabled:

1263

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

1561

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

1264

1562

client.name)

1265

1563

if self.server.use_dbus:

1266

1564

# Emit D-Bus signal

1267

client.Rejected("Disabled")

1565

client.Rejected("Disabled")

1268

1566

return

1269

1567

1270

if client._approved or not client.approval_delay:

1568

if client.approved or not client.approval_delay:

1271

1569

#We are approved or approval is disabled

1272

1570

break

1273

elif client._approved is None:

1571

elif client.approved is None:

1274

1572

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

1275

1573

client.name)

1276

1574

if self.server.use_dbus:

1287

1585

return

1288

1586

1289

1587

#wait until timeout or approved

1290

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

1291

1588

time = datetime.datetime.now()

1292

1589

client.changedstate.acquire()

1293

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

1590

(client.changedstate.wait

1591

(float(client.timedelta_to_milliseconds(delay)

1592

/ 1000)))

1294

1593

client.changedstate.release()

1295

1594

time2 = datetime.datetime.now()

1296

1595

if (time2 - time) >= delay:

1318

1617

sent, len(client.secret)

1319

1618

- (sent_size + sent))

1320

1619

sent_size += sent

1321

1620

1322

1621

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

1323

# bump the timeout as if seen

1324

client.checked_ok()

1622

# bump the timeout using extended_timeout

1623

client.checked_ok(client.extended_timeout)

1325

1624

if self.server.use_dbus:

1326

1625

# Emit D-Bus signal

1327

1626

client.GotSecret()

1394

1693

# Convert the buffer to a Python bytestring

1395

1694

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

1396

1695

# Convert the bytestring to hexadecimal notation

1397

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

1696

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

1398

1697

return hex_fpr

1399

1698

1400

1699

1403

1702

def sub_process_main(self, request, address):

1404

1703

try:

1405

1704

self.finish_request(request, address)

1406

except:

1705

except Exception:

1407

1706

self.handle_error(request, address)

1408

1707

self.close_request(request)

1409

1708

1410

1709

def process_request(self, request, address):

1411

1710

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

1412

multiprocessing.Process(target = self.sub_process_main,

1413

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

1711

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

1712

args = (request,

1713

address))

1714

proc.start()

1715

return proc

1716

1414

1717

1415

1718

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1416

1719

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

1420

1723

This function creates a new pipe in self.pipe

1421

1724

"""

1422

1725

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1423

1424

super(MultiprocessingMixInWithPipe,

1425

self).process_request(request, client_address)

1726

1727

proc = MultiprocessingMixIn.process_request(self, request,

1728

client_address)

1426

1729

self.child_pipe.close()

1427

self.add_pipe(parent_pipe)

1428

1429

def add_pipe(self, parent_pipe):

1730

self.add_pipe(parent_pipe, proc)

1731

1732

def add_pipe(self, parent_pipe, proc):

1430

1733

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

1431

1734

raise NotImplementedError

1432

1735

1736

1433

1737

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1434

1738

socketserver.TCPServer, object):

1435

1739

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

1509

1813

self.enabled = False

1510

1814

self.clients = clients

1511

1815

if self.clients is None:

1512

self.clients = set()

1816

self.clients = {}

1513

1817

self.use_dbus = use_dbus

1514

1818

self.gnutls_priority = gnutls_priority

1515

1819

IPv6_TCPServer.__init__(self, server_address,

1519

1823

def server_activate(self):

1520

1824

if self.enabled:

1521

1825

return socketserver.TCPServer.server_activate(self)

1826

1522

1827

def enable(self):

1523

1828

self.enabled = True

1524

def add_pipe(self, parent_pipe):

1829

1830

def add_pipe(self, parent_pipe, proc):

1525

1831

# Call "handle_ipc" for both data and EOF events

1526

1832

gobject.io_add_watch(parent_pipe.fileno(),

1527

1833

gobject.IO_IN | gobject.IO_HUP,

1528

1834

functools.partial(self.handle_ipc,

1529

parent_pipe = parent_pipe))

1530

1835

parent_pipe =

1836

parent_pipe,

1837

proc = proc))

1838

1531

1839

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

1532

client_object=None):

1840

proc = None, client_object=None):

1533

1841

condition_names = {

1534

1842

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

1535

1843

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

1544

1852

for cond, name in

1545

1853

condition_names.iteritems()

1546

1854

if cond & condition)

1547

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

1855

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

1548

1856

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

1857

# Wait for other process to exit

1858

proc.join()

1549

1859

return False

1550

1860

1551

1861

# Read a request from the child

1556

1866

fpr = request[1]

1557

1867

address = request[2]

1558

1868

1559

for c in self.clients:

1869

for c in self.clients.itervalues():

1560

1870

if c.fingerprint == fpr:

1561

1871

client = c

1562

1872

break

1563

1873

else:

1564

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

1565

"dress: %s", fpr, address)

1874

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

1875

"dress: %s", fpr, address)

1566

1876

if self.use_dbus:

1567

1877

# Emit D-Bus signal

1568

mandos_dbus_service.ClientNotFound(fpr, address[0])

1878

mandos_dbus_service.ClientNotFound(fpr,

1879

address[0])

1569

1880

parent_pipe.send(False)

1570

1881

return False

1571

1882

1572

1883

gobject.io_add_watch(parent_pipe.fileno(),

1573

1884

gobject.IO_IN | gobject.IO_HUP,

1574

1885

functools.partial(self.handle_ipc,

1575

parent_pipe = parent_pipe,

1576

client_object = client))

1886

parent_pipe =

1887

parent_pipe,

1888

proc = proc,

1889

client_object =

1890

client))

1577

1891

parent_pipe.send(True)

1578

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

1892

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

1893

# same fileno

1579

1894

return False

1580

1895

if command == 'funcall':

1581

1896

funcname = request[1]

1582

1897

args = request[2]

1583

1898

kwargs = request[3]

1584

1899

1585

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

1586

1900

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

1901

funcname)(*args,

1902

**kwargs)))

1903

1587

1904

if command == 'getattr':

1588

1905

attrname = request[1]

1589

1906

if callable(client_object.__getattribute__(attrname)):

1590

1907

parent_pipe.send(('function',))

1591

1908

else:

1592

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

1909

parent_pipe.send(('data', client_object

1910

.__getattribute__(attrname)))

1593

1911

1594

1912

if command == 'setattr':

1595

1913

attrname = request[1]

1596

1914

value = request[2]

1597

1915

setattr(client_object, attrname, value)

1598

1916

1599

1917

return True

1600

1918

1601

1919

1638

1956

return timevalue

1639

1957

1640

1958

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

1665

1959

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

1666

1960

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

1667

1961

1722

2016

" system bus interface")

1723

2017

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

1724

2018

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

2019

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

2020

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

2021

" state")

2022

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

2023

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

2024

1725

2025

options = parser.parse_args()

1726

2026

1727

2027

if options.check:

1740

2040

"use_dbus": "True",

1741

2041

"use_ipv6": "True",

1742

2042

"debuglevel": "",

2043

"restore": "True",

2044

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

1743

2045

}

1744

2046

1745

2047

# Parse config file for server-global settings

1762

2064

# options, if set.

1763

2065

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

1764

2066

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

1765

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

2067

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

2068

"statedir"):

1766

2069

value = getattr(options, option)

1767

2070

if value is not None:

1768

2071

server_settings[option] = value

1780

2083

debuglevel = server_settings["debuglevel"]

1781

2084

use_dbus = server_settings["use_dbus"]

1782

2085

use_ipv6 = server_settings["use_ipv6"]

1783

2086

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

2087

stored_state_file)

2088

2089

if debug:

2090

initlogger(debug, logging.DEBUG)

2091

else:

2092

if not debuglevel:

2093

initlogger(debug)

2094

else:

2095

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

2096

initlogger(debug, level)

2097

1784

2098

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

1785

2099

syslogger.setFormatter(logging.Formatter

1786

2100

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

1788

2102

% server_settings["servicename"]))

1789

2103

1790

2104

# Parse config file with clients

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)

2105

client_config = configparser.SafeConfigParser(Client

2106

.client_defaults)

1799

2107

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

1800

2108

"clients.conf"))

1801

2109

1839

2147

if error[0] != errno.EPERM:

1840

2148

raise error

1841

2149

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

1850

2150

if debug:

1851

2151

# Enable all possible GnuTLS debugging

1852

2152

1866

2166

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

1867

2167

if null > 2:

1868

2168

os.close(null)

1869

else:

1870

# No console logging

1871

logger.removeHandler(console)

1872

2169

1873

2170

# Need to fork before connecting to D-Bus

1874

2171

if not debug:

1875

2172

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

1876

2173

daemon()

1877

2174

2175

gobject.threads_init()

2176

1878

2177

global main_loop

1879

2178

# From the Avahi example code

1880

2179

DBusGMainLoop(set_as_default=True )

1883

2182

# End of Avahi example code

1884

2183

if use_dbus:

1885

2184

try:

1886

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

2185

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

1887

2186

bus, do_not_queue=True)

2187

old_bus_name = (dbus.service.BusName

2188

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

2189

do_not_queue=True))

1888

2190

except dbus.exceptions.NameExistsException as e:

1889

2191

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

1890

2192

use_dbus = False

1891

2193

server_settings["use_dbus"] = False

1892

2194

tcp_server.use_dbus = False

1893

2195

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

1894

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

1895

servicetype = "_mandos._tcp",

1896

protocol = protocol, bus = bus)

2196

service = AvahiServiceToSyslog(name =

2197

server_settings["servicename"],

2198

servicetype = "_mandos._tcp",

2199

protocol = protocol, bus = bus)

1897

2200

if server_settings["interface"]:

1898

2201

service.interface = (if_nametoindex

1899

2202

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

1903

2206

1904

2207

client_class = Client

1905

2208

if use_dbus:

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):

2209

client_class = functools.partial(ClientDBusTransitional,

2210

bus = bus)

2211

2212

client_settings = Client.config_parser(client_config)

2213

old_client_settings = {}

2214

clients_data = {}

2215

2216

# Get client data and settings from last running state.

2217

if server_settings["restore"]:

2218

try:

2219

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

2220

clients_data, old_client_settings = (pickle.load

2221

(stored_state))

2222

os.remove(stored_state_path)

2223

except IOError as e:

2224

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

2225

.format(e))

2226

if e.errno != errno.ENOENT:

2227

raise

2228

except EOFError as e:

2229

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

2230

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

2231

2232

with PGPEngine() as pgp:

2233

for client_name, client in clients_data.iteritems():

2234

# Decide which value to use after restoring saved state.

2235

# We have three different values: Old config file,

2236

# new config file, and saved state.

2237

# New config value takes precedence if it differs from old

2238

# config value, otherwise use saved state.

2239

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

2240

try:

2241

# For each value in new config, check if it

2242

# differs from the old config value (Except for

2243

# the "secret" attribute)

2244

if (name != "secret" and

2245

value != old_client_settings[client_name]

2246

[name]):

2247

client[name] = value

2248

except KeyError:

2249

pass

2250

2251

# Clients who has passed its expire date can still be

2252

# enabled if its last checker was successful. Clients

2253

# whose checker failed before we stored its state is

2254

# assumed to have failed all checkers during downtime.

2255

if client["enabled"]:

2256

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

2257

if not client["last_checked_ok"]:

2258

logger.warning(

2259

"disabling client {0} - Client never "

2260

"performed a successfull checker"

2261

.format(client["name"]))

2262

client["enabled"] = False

2263

elif client["last_checker_status"] != 0:

2264

logger.warning(

2265

"disabling client {0} - Client "

2266

"last checker failed with error code {1}"

2267

.format(client["name"],

2268

client["last_checker_status"]))

2269

client["enabled"] = False

2270

else:

2271

client["expires"] = (datetime.datetime

2272

.utcnow()

2273

+ client["timeout"])

2274

logger.debug("Last checker succeeded,"

2275

" keeping {0} enabled"

2276

.format(client["name"]))

1914

2277

try:

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()))

2278

client["secret"] = (

2279

pgp.decrypt(client["encrypted_secret"],

2280

client_settings[client_name]

2281

["secret"]))

2282

except PGPError:

2283

# If decryption fails, we use secret from new settings

2284

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

2285

.format(client_name))

2286

client["secret"] = (

2287

client_settings[client_name]["secret"])

2288

2289

2290

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

2291

for client_name in (set(old_client_settings)

2292

- set(client_settings)):

2293

del clients_data[client_name]

2294

for client_name in (set(client_settings)

2295

- set(old_client_settings)):

2296

clients_data[client_name] = client_settings[client_name]

2297

2298

# Create clients all clients

2299

for client_name, client in clients_data.iteritems():

2300

tcp_server.clients[client_name] = client_class(

2301

name = client_name, settings = client)

2302

1924

2303

if not tcp_server.clients:

1925

2304

logger.warning("No clients defined")

1926

2305

1937

2316

# "pidfile" was never created

1938

2317

pass

1939

2318

del pidfilename

1940

1941

2319

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

1942

2320

1943

2321

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

1944

2322

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

1945

2323

1948

2326

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

1949

2327

def __init__(self):

1950

2328

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

1951

_interface = "se.bsnet.fukt.Mandos"

2329

_interface = "se.recompile.Mandos"

1952

2330

1953

2331

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

1954

2332

def ClientAdded(self, objpath):

1969

2347

def GetAllClients(self):

1970

2348

"D-Bus method"

1971

2349

return dbus.Array(c.dbus_object_path

1972

for c in tcp_server.clients)

2350

for c in

2351

tcp_server.clients.itervalues())

1973

2352

1974

2353

@dbus.service.method(_interface,

1975

2354

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

1977

2356

"D-Bus method"

1978

2357

return dbus.Dictionary(

1979

2358

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

1980

for c in tcp_server.clients),

2359

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

1981

2360

signature="oa{sv}")

1982

2361

1983

2362

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

1984

2363

def RemoveClient(self, object_path):

1985

2364

"D-Bus method"

1986

for c in tcp_server.clients:

2365

for c in tcp_server.clients.itervalues():

1987

2366

if c.dbus_object_path == object_path:

1988

tcp_server.clients.remove(c)

2367

del tcp_server.clients[c.name]

1989

2368

c.remove_from_connection()

1990

2369

# Don't signal anything except ClientRemoved

1991

2370

c.disable(quiet=True)

1996

2375

1997

2376

del _interface

1998

2377

1999

mandos_dbus_service = MandosDBusService()

2378

class MandosDBusServiceTransitional(MandosDBusService):

2379

__metaclass__ = AlternateDBusNamesMetaclass

2380

mandos_dbus_service = MandosDBusServiceTransitional()

2000

2381

2001

2382

def cleanup():

2002

2383

"Cleanup function; run on exit"

2003

2384

service.cleanup()

2004

2385

2386

multiprocessing.active_children()

2387

if not (tcp_server.clients or client_settings):

2388

return

2389

2390

# Store client before exiting. Secrets are encrypted with key

2391

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

2392

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

2393

clients = {}

2394

with PGPEngine() as pgp:

2395

for client in tcp_server.clients.itervalues():

2396

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

2397

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

2398

key)

2399

client_dict = {}

2400

2401

# A list of attributes that can not be pickled

2402

# + secret.

2403

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

2404

"checker"))

2405

for name, typ in (inspect.getmembers

2406

(dbus.service.Object)):

2407

exclude.add(name)

2408

2409

client_dict["encrypted_secret"] = (client

2410

.encrypted_secret)

2411

for attr in client.client_structure:

2412

if attr not in exclude:

2413

client_dict[attr] = getattr(client, attr)

2414

2415

clients[client.name] = client_dict

2416

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

2417

2418

try:

2419

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

2420

prefix="clients-",

2421

dir=os.path.dirname

2422

(stored_state_path))

2423

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

2424

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

2425

os.rename(tempname, stored_state_path)

2426

except (IOError, OSError) as e:

2427

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

2428

.format(e))

2429

if not debug:

2430

try:

2431

os.remove(tempname)

2432

except NameError:

2433

pass

2434

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

2435

errno.EEXIST)):

2436

raise e

2437

2438

# Delete all clients, and settings from config

2005

2439

while tcp_server.clients:

2006

client = tcp_server.clients.pop()

2440

name, client = tcp_server.clients.popitem()

2007

2441

if use_dbus:

2008

2442

client.remove_from_connection()

2009

client.disable_hook = None

2010

2443

# Don't signal anything except ClientRemoved

2011

2444

client.disable(quiet=True)

2012

2445

if use_dbus:

2013

2446

# Emit D-Bus signal

2014

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2447

mandos_dbus_service.ClientRemoved(client

2448

.dbus_object_path,

2015

2449

client.name)

2450

client_settings.clear()

2016

2451

2017

2452

atexit.register(cleanup)

2018

2453

2019

for client in tcp_server.clients:

2454

for client in tcp_server.clients.itervalues():

2020

2455

if use_dbus:

2021

2456

# Emit D-Bus signal

2022

2457

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2023

client.enable()

2458

# Need to initiate checking of clients

2459

if client.enabled:

2460

client.init_checker()

2024

2461

2025

2462

tcp_server.enable()

2026

2463

tcp_server.server_activate()