/mandos/trunk : revision 491

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

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#

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# Everything else is

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#

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

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

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# along with this program. If not, see

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

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#

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

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

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#

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from __future__ import (division, absolute_import, print_function,

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import functools

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import cPickle as pickle

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import multiprocessing

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import types

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import binascii

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import tempfile

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import dbus

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import dbus.service

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import ctypes.util

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import xml.dom.minidom

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import inspect

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import GnuPGInterface

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try:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.5.1"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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version = "1.3.1"

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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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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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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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dbus.exceptions.DBusException) as e:

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pass

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self.group = None

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self.remove()

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self.server_state_changed)

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

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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return ret

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def timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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

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Attributes:

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

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

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

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

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

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

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checker_initiator_tag: a gobject event source tag, or None

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

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client_structure: Object describing what attributes a client has

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and is used for storing the client at exit

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current_checker_command: string; current running checker_command

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

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disable_initiator_tag: a gobject event source tag, or None

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enabled: bool()

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

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

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

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

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, or None.

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

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last_enabled: datetime.datetime(); (UTC)

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when secret has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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

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

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"extended_timeout": "15m",

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"interval": "2m",

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

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"host": "",

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"approval_delay": "0s",

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"approval_duration": "1s",

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"approved_by_default": "True",

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"enabled": "True",

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}

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@staticmethod

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def _timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.extended_timeout)

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return self._timedelta_to_milliseconds(self.timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return timedelta_to_milliseconds(self.interval)

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return self._timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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

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

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with exceptions for any special settings as defined above.

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

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value given the same arguments.

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"""

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settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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client = settings[client_name] = {}

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

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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

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"enabled")

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

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.replace(" ", ""))

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if "secret" in section:

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

485

elif "secfile" in section:

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

487

(section["secfile"])),

488

"rb") as secfile:

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

490

else:

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

492

% 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"]

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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):

324

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

330

self.name = name

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# adding all client settings

515

for setting, value in settings.iteritems():

516

setattr(self, setting, value)

517

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if self.enabled:

519

if not hasattr(self, "last_enabled"):

520

self.last_enabled = datetime.datetime.utcnow()

521

if not hasattr(self, "expires"):

522

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

523

+ self.timeout)

524

else:

525

self.last_enabled = None

526

self.expires = None

527

331

if config is None:

332

config = {}

528

333

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

529

334

# Uppercase and remove spaces from fingerprint for later

530

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# comparison purposes with return value from the fingerprint()

531

336

# function

337

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

338

.replace(" ", ""))

532

339

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

533

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

534

datetime.datetime.utcnow())

535

536

# attributes specific for this server instance

340

if "secret" in config:

341

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

342

elif "secfile" in config:

343

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

344

(config["secfile"])),

345

"rb") as secfile:

346

self.secret = secfile.read()

347

else:

348

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

349

% self.name)

350

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

351

self.created = datetime.datetime.utcnow()

352

self.enabled = False

353

self.last_approval_request = None

354

self.last_enabled = None

355

self.last_checked_ok = None

356

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

357

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

358

self.disable_hook = disable_hook

537

359

self.checker = None

538

360

self.checker_initiator_tag = None

539

361

self.disable_initiator_tag = None

540

362

self.checker_callback_tag = None

363

self.checker_command = config["checker"]

541

364

self.current_checker_command = None

542

self.approved = None

365

self.last_connect = None

366

self._approved = None

367

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

368

True)

543

369

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)

370

self.approval_delay = string_to_delta(

371

config["approval_delay"])

372

self.approval_duration = string_to_delta(

373

config["approval_duration"])

374

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

558

375

559

# Send notice to process children that client state has changed

560

376

def send_changedstate(self):

561

with self.changedstate:

562

self.changedstate.notify_all()

563

377

self.changedstate.acquire()

378

self.changedstate.notify_all()

379

self.changedstate.release()

380

564

381

def enable(self):

565

382

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

566

383

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

567

384

# Already enabled

568

385

return

569

386

self.send_changedstate()

570

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

571

self.enabled = True

572

387

self.last_enabled = datetime.datetime.utcnow()

573

self.init_checker()

388

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

389

# and every interval from then on.

390

self.checker_initiator_tag = (gobject.timeout_add

391

(self.interval_milliseconds(),

392

self.start_checker))

393

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

394

self.disable_initiator_tag = (gobject.timeout_add

395

(self.timeout_milliseconds(),

396

self.disable))

397

self.enabled = True

398

# Also start a new checker *right now*.

399

self.start_checker()

574

400

575

401

def disable(self, quiet=True):

576

402

"""Disable this client."""

583

409

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

584

410

gobject.source_remove(self.disable_initiator_tag)

585

411

self.disable_initiator_tag = None

586

self.expires = None

587

412

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

588

413

gobject.source_remove(self.checker_initiator_tag)

589

414

self.checker_initiator_tag = None

590

415

self.stop_checker()

416

if self.disable_hook:

417

self.disable_hook(self)

591

418

self.enabled = False

592

419

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

593

420

return False

594

421

595

422

def __del__(self):

423

self.disable_hook = None

596

424

self.disable()

597

425

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

426

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

612

427

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

613

428

self.checker_callback_tag = None

614

429

self.checker = None

615

430

if os.WIFEXITED(condition):

616

self.last_checker_status = os.WEXITSTATUS(condition)

617

if self.last_checker_status == 0:

431

exitstatus = os.WEXITSTATUS(condition)

432

if exitstatus == 0:

618

433

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

619

434

vars(self))

620

435

self.checked_ok()

622

437

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

623

438

vars(self))

624

439

else:

625

self.last_checker_status = -1

626

440

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

627

441

vars(self))

628

442

629

def checked_ok(self, timeout=None):

443

def checked_ok(self):

630

444

"""Bump up the timeout for this client.

631

445

632

446

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

633

447

alive and well.

634

448

"""

635

if timeout is None:

636

timeout = self.timeout

637

449

self.last_checked_ok = datetime.datetime.utcnow()

638

if self.disable_initiator_tag is not None:

639

gobject.source_remove(self.disable_initiator_tag)

640

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

641

self.disable_initiator_tag = (gobject.timeout_add

642

(timedelta_to_milliseconds

643

(timeout), self.disable))

644

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

450

gobject.source_remove(self.disable_initiator_tag)

451

self.disable_initiator_tag = (gobject.timeout_add

452

(self.timeout_milliseconds(),

453

self.disable))

645

454

646

455

def need_approval(self):

647

456

self.last_approval_request = datetime.datetime.utcnow()

687

496

'replace')))

688

497

for attr in

689

498

self.runtime_expansions)

690

499

691

500

try:

692

501

command = self.checker_command % escaped_attrs

693

502

except TypeError as error:

739

548

raise

740

549

self.checker = None

741

550

742

743

551

def dbus_service_property(dbus_interface, signature="v",

744

552

access="readwrite", byte_arrays=False):

745

553

"""Decorators for marking methods of a DBusObjectWithProperties to

791

599

792

600

class DBusObjectWithProperties(dbus.service.Object):

793

601

"""A D-Bus object with properties.

794

602

795

603

Classes inheriting from this can use the dbus_service_property

796

604

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

797

605

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

804

612

def _get_all_dbus_properties(self):

805

613

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

806

614

"""

807

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

808

for cls in self.__class__.__mro__

615

return ((prop._dbus_name, prop)

809

616

for name, prop in

810

inspect.getmembers(cls, self._is_dbus_property))

617

inspect.getmembers(self, self._is_dbus_property))

811

618

812

619

def _get_dbus_property(self, interface_name, property_name):

813

620

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

814

621

property with the specified name and interface.

815

622

"""

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

623

for name in (property_name,

624

property_name + "_dbus_property"):

625

prop = getattr(self, name, None)

626

if (prop is None

627

or not self._is_dbus_property(prop)

628

or prop._dbus_name != property_name

629

or (interface_name and prop._dbus_interface

630

and interface_name != prop._dbus_interface)):

631

continue

632

return prop

823

633

# No such property

824

634

raise DBusPropertyNotFound(self.dbus_object_path + ":"

825

635

+ interface_name + "."

850

660

# signatures other than "ay".

851

661

if prop._dbus_signature != "ay":

852

662

raise ValueError

853

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

854

for byte in value))

663

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

664

for byte in value))

855

665

prop(value)

856

666

857

667

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

859

669

def GetAll(self, interface_name):

860

670

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

861

671

standard.

862

672

863

673

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

864

674

"""

865

properties = {}

675

all = {}

866

676

for name, prop in self._get_all_dbus_properties():

867

677

if (interface_name

868

678

and interface_name != prop._dbus_interface):

873

683

continue

874

684

value = prop()

875

685

if not hasattr(value, "variant_level"):

876

properties[name] = value

686

all[name] = value

877

687

continue

878

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

879

value.variant_level+1)

880

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

688

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

689

value.variant_level+1)

690

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

881

691

882

692

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

883

693

out_signature="s",

927

737

return xmlstring

928

738

929

739

930

def datetime_to_dbus (dt, variant_level=0):

931

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

932

if dt is None:

933

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

934

return dbus.String(dt.isoformat(),

935

variant_level=variant_level)

936

937

938

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

939

.__metaclass__):

940

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

941

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

942

"""

943

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

944

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

945

# methods, signals, or properties in them

946

for base in (b for b in bases

947

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

948

# Go though all attributes of the base class

949

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

950

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

951

# with the wrong interface name

952

if (not hasattr(attribute, "_dbus_interface")

953

or not attribute._dbus_interface

954

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

955

continue

956

# Create an alternate D-Bus interface name based on

957

# the current name

958

alt_interface = (attribute._dbus_interface

959

.replace("se.recompile.Mandos",

960

"se.bsnet.fukt.Mandos"))

961

# Is this a D-Bus signal?

962

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

963

# Extract the original non-method function by

964

# black magic

965

nonmethod_func = (dict(

966

zip(attribute.func_code.co_freevars,

967

attribute.__closure__))["func"]

968

.cell_contents)

969

# Create a new, but exactly alike, function

970

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

971

# with the alternate D-Bus interface name

972

new_function = (dbus.service.signal

973

(alt_interface,

974

attribute._dbus_signature)

975

(types.FunctionType(

976

nonmethod_func.func_code,

977

nonmethod_func.func_globals,

978

nonmethod_func.func_name,

979

nonmethod_func.func_defaults,

980

nonmethod_func.func_closure)))

981

# Define a creator of a function to call both the

982

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

983

# signals gets sent when the function is called

984

def fixscope(func1, func2):

985

"""This function is a scope container to pass

986

func1 and func2 to the "call_both" function

987

outside of its arguments"""

988

def call_both(*args, **kwargs):

989

"""This function will emit two D-Bus

990

signals by calling func1 and func2"""

991

func1(*args, **kwargs)

992

func2(*args, **kwargs)

993

return call_both

994

# Create the "call_both" function and add it to

995

# the class

996

attr[attrname] = fixscope(attribute,

997

new_function)

998

# Is this a D-Bus method?

999

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

1000

# Create a new, but exactly alike, function

1001

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

1002

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

1003

# to the class.

1004

attr[attrname] = (dbus.service.method

1005

(alt_interface,

1006

attribute._dbus_in_signature,

1007

attribute._dbus_out_signature)

1008

(types.FunctionType

1009

(attribute.func_code,

1010

attribute.func_globals,

1011

attribute.func_name,

1012

attribute.func_defaults,

1013

attribute.func_closure)))

1014

# Is this a D-Bus property?

1015

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

1016

# Create a new, but exactly alike, function

1017

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

1018

# property with the alternate D-Bus interface

1019

# name. Add it to the class.

1020

attr[attrname] = (dbus_service_property

1021

(alt_interface,

1022

attribute._dbus_signature,

1023

attribute._dbus_access,

1024

attribute

1025

._dbus_get_args_options

1026

["byte_arrays"])

1027

(types.FunctionType

1028

(attribute.func_code,

1029

attribute.func_globals,

1030

attribute.func_name,

1031

attribute.func_defaults,

1032

attribute.func_closure)))

1033

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

1034

1035

1036

740

class ClientDBus(Client, DBusObjectWithProperties):

1037

741

"""A Client class using D-Bus

1038

742

1047

751

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

1048

752

1049

753

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

754

self._approvals_pending = 0

1050

755

self.bus = bus

1051

756

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

1052

757

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

1059

764

DBusObjectWithProperties.__init__(self, self.bus,

1060

765

self.dbus_object_path)

1061

766

1062

def notifychangeproperty(transform_func,

1063

dbus_name, type_func=lambda x: x,

1064

variant_level=1):

1065

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

1066

its changes to DBus.

1067

1068

transform_fun: Function that takes a value and a variant_level

1069

and transforms it to a D-Bus type.

1070

dbus_name: D-Bus name of the variable

1071

type_func: Function that transform the value before sending it

1072

to the D-Bus. Default: no transform

1073

variant_level: D-Bus variant level. Default: 1

1074

"""

1075

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

1076

def setter(self, value):

1077

if hasattr(self, "dbus_object_path"):

1078

if (not hasattr(self, attrname) or

1079

type_func(getattr(self, attrname, None))

1080

!= type_func(value)):

1081

dbus_value = transform_func(type_func(value),

1082

variant_level

1083

=variant_level)

1084

self.PropertyChanged(dbus.String(dbus_name),

1085

dbus_value)

1086

setattr(self, attrname, value)

1087

1088

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

1089

1090

1091

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1092

approvals_pending = notifychangeproperty(dbus.Boolean,

1093

"ApprovalPending",

1094

type_func = bool)

1095

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

1096

last_enabled = notifychangeproperty(datetime_to_dbus,

1097

"LastEnabled")

1098

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

1099

type_func = lambda checker:

1100

checker is not None)

1101

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1102

"LastCheckedOK")

1103

last_approval_request = notifychangeproperty(

1104

datetime_to_dbus, "LastApprovalRequest")

1105

approved_by_default = notifychangeproperty(dbus.Boolean,

1106

"ApprovedByDefault")

1107

approval_delay = notifychangeproperty(dbus.UInt64,

1108

"ApprovalDelay",

1109

type_func =

1110

timedelta_to_milliseconds)

1111

approval_duration = notifychangeproperty(

1112

dbus.UInt64, "ApprovalDuration",

1113

type_func = timedelta_to_milliseconds)

1114

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

1115

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

1116

type_func =

1117

timedelta_to_milliseconds)

1118

extended_timeout = notifychangeproperty(

1119

dbus.UInt64, "ExtendedTimeout",

1120

type_func = timedelta_to_milliseconds)

1121

interval = notifychangeproperty(dbus.UInt64,

1122

"Interval",

1123

type_func =

1124

timedelta_to_milliseconds)

1125

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

1126

1127

del notifychangeproperty

767

def _get_approvals_pending(self):

768

return self._approvals_pending

769

def _set_approvals_pending(self, value):

770

old_value = self._approvals_pending

771

self._approvals_pending = value

772

bval = bool(value)

773

if (hasattr(self, "dbus_object_path")

774

and bval is not bool(old_value)):

775

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

776

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

777

dbus_bool)

778

779

approvals_pending = property(_get_approvals_pending,

780

_set_approvals_pending)

781

del _get_approvals_pending, _set_approvals_pending

782

783

@staticmethod

784

def _datetime_to_dbus(dt, variant_level=0):

785

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

786

return dbus.String(dt.isoformat(),

787

variant_level=variant_level)

788

789

def enable(self):

790

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

791

r = Client.enable(self)

792

if oldstate != self.enabled:

793

# Emit D-Bus signals

794

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

795

dbus.Boolean(True, variant_level=1))

796

self.PropertyChanged(

797

dbus.String("LastEnabled"),

798

self._datetime_to_dbus(self.last_enabled,

799

variant_level=1))

800

return r

801

802

def disable(self, quiet = False):

803

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

804

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

805

if not quiet and oldstate != self.enabled:

806

# Emit D-Bus signal

807

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

808

dbus.Boolean(False, variant_level=1))

809

return r

1128

810

1129

811

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

1130

812

try:

1139

821

*args, **kwargs):

1140

822

self.checker_callback_tag = None

1141

823

self.checker = None

824

# Emit D-Bus signal

825

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

826

dbus.Boolean(False, variant_level=1))

1142

827

if os.WIFEXITED(condition):

1143

828

exitstatus = os.WEXITSTATUS(condition)

1144

829

# Emit D-Bus signal

1154

839

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

1155

840

*args, **kwargs)

1156

841

842

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

843

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

844

# Emit D-Bus signal

845

self.PropertyChanged(

846

dbus.String("LastCheckedOK"),

847

(self._datetime_to_dbus(self.last_checked_ok,

848

variant_level=1)))

849

850

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

851

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

852

# Emit D-Bus signal

853

self.PropertyChanged(

854

dbus.String("LastApprovalRequest"),

855

(self._datetime_to_dbus(self.last_approval_request,

856

variant_level=1)))

857

return r

858

1157

859

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

1158

860

old_checker = self.checker

1159

861

if self.checker is not None:

1166

868

and old_checker_pid != self.checker.pid):

1167

869

# Emit D-Bus signal

1168

870

self.CheckerStarted(self.current_checker_command)

871

self.PropertyChanged(

872

dbus.String("CheckerRunning"),

873

dbus.Boolean(True, variant_level=1))

1169

874

return r

1170

875

876

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

877

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

878

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

879

if (old_checker is not None

880

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

881

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

882

dbus.Boolean(False, variant_level=1))

883

return r

884

1171

885

def _reset_approved(self):

1172

self.approved = None

886

self._approved = None

1173

887

return False

1174

888

1175

889

def approve(self, value=True):

1176

890

self.send_changedstate()

1177

self.approved = value

1178

gobject.timeout_add(timedelta_to_milliseconds

891

self._approved = value

892

gobject.timeout_add(self._timedelta_to_milliseconds

1179

893

(self.approval_duration),

1180

894

self._reset_approved)

1181

895

1182

896

1183

897

## D-Bus methods, signals & properties

1184

_interface = "se.recompile.Mandos.Client"

898

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

1185

899

1186

900

## Signals

1187

901

1273

987

if value is None: # get

1274

988

return dbus.Boolean(self.approved_by_default)

1275

989

self.approved_by_default = bool(value)

990

# Emit D-Bus signal

991

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

992

dbus.Boolean(value, variant_level=1))

1276

993

1277

994

# ApprovalDelay - property

1278

995

@dbus_service_property(_interface, signature="t",

1281

998

if value is None: # get

1282

999

return dbus.UInt64(self.approval_delay_milliseconds())

1283

1000

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

1001

# Emit D-Bus signal

1002

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

1003

dbus.UInt64(value, variant_level=1))

1284

1004

1285

1005

# ApprovalDuration - property

1286

1006

@dbus_service_property(_interface, signature="t",

1287

1007

access="readwrite")

1288

1008

def ApprovalDuration_dbus_property(self, value=None):

1289

1009

if value is None: # get

1290

return dbus.UInt64(timedelta_to_milliseconds(

1010

return dbus.UInt64(self._timedelta_to_milliseconds(

1291

1011

self.approval_duration))

1292

1012

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

1013

# Emit D-Bus signal

1014

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

1015

dbus.UInt64(value, variant_level=1))

1293

1016

1294

1017

# Name - property

1295

1018

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

1307

1030

def Host_dbus_property(self, value=None):

1308

1031

if value is None: # get

1309

1032

return dbus.String(self.host)

1310

self.host = unicode(value)

1033

self.host = value

1034

# Emit D-Bus signal

1035

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

1036

dbus.String(value, variant_level=1))

1311

1037

1312

1038

# Created - property

1313

1039

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

1314

1040

def Created_dbus_property(self):

1315

return datetime_to_dbus(self.created)

1041

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

1316

1042

1317

1043

# LastEnabled - property

1318

1044

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

1319

1045

def LastEnabled_dbus_property(self):

1320

return datetime_to_dbus(self.last_enabled)

1046

if self.last_enabled is None:

1047

return dbus.String("")

1048

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

1321

1049

1322

1050

# Enabled - property

1323

1051

@dbus_service_property(_interface, signature="b",

1337

1065

if value is not None:

1338

1066

self.checked_ok()

1339

1067

return

1340

return datetime_to_dbus(self.last_checked_ok)

1341

1342

# Expires - property

1343

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

1344

def Expires_dbus_property(self):

1345

return datetime_to_dbus(self.expires)

1068

if self.last_checked_ok is None:

1069

return dbus.String("")

1070

return dbus.String(self._datetime_to_dbus(self

1071

.last_checked_ok))

1346

1072

1347

1073

# LastApprovalRequest - property

1348

1074

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

1349

1075

def LastApprovalRequest_dbus_property(self):

1350

return datetime_to_dbus(self.last_approval_request)

1076

if self.last_approval_request is None:

1077

return dbus.String("")

1078

return dbus.String(self.

1079

_datetime_to_dbus(self

1080

.last_approval_request))

1351

1081

1352

1082

# Timeout - property

1353

1083

@dbus_service_property(_interface, signature="t",

1356

1086

if value is None: # get

1357

1087

return dbus.UInt64(self.timeout_milliseconds())

1358

1088

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

1089

# Emit D-Bus signal

1090

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

1091

dbus.UInt64(value, variant_level=1))

1092

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

1093

return

1359

1094

# Reschedule timeout

1360

if self.enabled:

1361

now = datetime.datetime.utcnow()

1362

time_to_die = timedelta_to_milliseconds(

1363

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

1364

if time_to_die <= 0:

1365

# The timeout has passed

1366

self.disable()

1367

else:

1368

self.expires = (now +

1369

datetime.timedelta(milliseconds =

1370

time_to_die))

1371

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

1372

is None):

1373

return

1374

gobject.source_remove(self.disable_initiator_tag)

1375

self.disable_initiator_tag = (gobject.timeout_add

1376

(time_to_die,

1377

self.disable))

1378

1379

# ExtendedTimeout - property

1380

@dbus_service_property(_interface, signature="t",

1381

access="readwrite")

1382

def ExtendedTimeout_dbus_property(self, value=None):

1383

if value is None: # get

1384

return dbus.UInt64(self.extended_timeout_milliseconds())

1385

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

1095

gobject.source_remove(self.disable_initiator_tag)

1096

self.disable_initiator_tag = None

1097

time_to_die = (self.

1098

_timedelta_to_milliseconds((self

1099

.last_checked_ok

1100

+ self.timeout)

1101

- datetime.datetime

1102

.utcnow()))

1103

if time_to_die <= 0:

1104

# The timeout has passed

1105

self.disable()

1106

else:

1107

self.disable_initiator_tag = (gobject.timeout_add

1108

(time_to_die, self.disable))

1386

1109

1387

1110

# Interval - property

1388

1111

@dbus_service_property(_interface, signature="t",

1391

1114

if value is None: # get

1392

1115

return dbus.UInt64(self.interval_milliseconds())

1393

1116

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

1117

# Emit D-Bus signal

1118

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

1119

dbus.UInt64(value, variant_level=1))

1394

1120

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

1395

1121

return

1396

if self.enabled:

1397

# Reschedule checker run

1398

gobject.source_remove(self.checker_initiator_tag)

1399

self.checker_initiator_tag = (gobject.timeout_add

1400

(value, self.start_checker))

1401

self.start_checker() # Start one now, too

1402

1122

# Reschedule checker run

1123

gobject.source_remove(self.checker_initiator_tag)

1124

self.checker_initiator_tag = (gobject.timeout_add

1125

(value, self.start_checker))

1126

self.start_checker() # Start one now, too

1127

1403

1128

# Checker - property

1404

1129

@dbus_service_property(_interface, signature="s",

1405

1130

access="readwrite")

1406

1131

def Checker_dbus_property(self, value=None):

1407

1132

if value is None: # get

1408

1133

return dbus.String(self.checker_command)

1409

self.checker_command = unicode(value)

1134

self.checker_command = value

1135

# Emit D-Bus signal

1136

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

1137

dbus.String(self.checker_command,

1138

variant_level=1))

1410

1139

1411

1140

# CheckerRunning - property

1412

1141

@dbus_service_property(_interface, signature="b",

1439

1168

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

1440

1169

if not self._pipe.recv():

1441

1170

raise KeyError()

1442

1171

1443

1172

def __getattribute__(self, name):

1444

if name == '_pipe':

1173

if(name == '_pipe'):

1445

1174

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

1446

1175

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

1447

1176

data = self._pipe.recv()

1452

1181

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

1453

1182

return self._pipe.recv()[1]

1454

1183

return func

1455

1184

1456

1185

def __setattr__(self, name, value):

1457

if name == '_pipe':

1186

if(name == '_pipe'):

1458

1187

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

1459

1188

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

1460

1189

1461

1190

1462

class ClientDBusTransitional(ClientDBus):

1463

__metaclass__ = AlternateDBusNamesMetaclass

1464

1465

1466

1191

class ClientHandler(socketserver.BaseRequestHandler, object):

1467

1192

"""A class to handle client connections.

1468

1193

1475

1200

unicode(self.client_address))

1476

1201

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

1477

1202

self.server.child_pipe.fileno())

1478

1203

1479

1204

session = (gnutls.connection

1480

1205

.ClientSession(self.request,

1481

1206

gnutls.connection

1482

1207

.X509Credentials()))

1483

1208

1484

1209

# Note: gnutls.connection.X509Credentials is really a

1485

1210

# generic GnuTLS certificate credentials object so long as

1486

1211

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

1487

1212

# here despite using OpenPGP certificates.

1488

1213

1489

1214

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

1490

1215

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

1491

1216

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

1497

1222

(gnutls.library.functions

1498

1223

.gnutls_priority_set_direct(session._c_object,

1499

1224

priority, None))

1500

1225

1501

1226

# Start communication using the Mandos protocol

1502

1227

# Get protocol number

1503

1228

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

1508

1233

except (ValueError, IndexError, RuntimeError) as error:

1509

1234

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

1510

1235

return

1511

1236

1512

1237

# Start GnuTLS connection

1513

1238

try:

1514

1239

session.handshake()

1518

1243

# established. Just abandon the request.

1519

1244

return

1520

1245

logger.debug("Handshake succeeded")

1521

1246

1522

1247

approval_required = False

1523

1248

try:

1524

1249

try:

1529

1254

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

1530

1255

return

1531

1256

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

1532

1257

1533

1258

try:

1534

1259

client = ProxyClient(child_pipe, fpr,

1535

1260

self.client_address)

1547

1272

client.name)

1548

1273

if self.server.use_dbus:

1549

1274

# Emit D-Bus signal

1550

client.Rejected("Disabled")

1275

client.Rejected("Disabled")

1551

1276

return

1552

1277

1553

if client.approved or not client.approval_delay:

1278

if client._approved or not client.approval_delay:

1554

1279

#We are approved or approval is disabled

1555

1280

break

1556

elif client.approved is None:

1281

elif client._approved is None:

1557

1282

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

1558

1283

client.name)

1559

1284

if self.server.use_dbus:

1570

1295

return

1571

1296

1572

1297

#wait until timeout or approved

1298

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

1573

1299

time = datetime.datetime.now()

1574

1300

client.changedstate.acquire()

1575

(client.changedstate.wait

1576

(float(client.timedelta_to_milliseconds(delay)

1577

/ 1000)))

1301

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

1578

1302

client.changedstate.release()

1579

1303

time2 = datetime.datetime.now()

1580

1304

if (time2 - time) >= delay:

1602

1326

sent, len(client.secret)

1603

1327

- (sent_size + sent))

1604

1328

sent_size += sent

1605

1329

1606

1330

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

1607

# bump the timeout using extended_timeout

1608

client.checked_ok(client.extended_timeout)

1331

# bump the timeout as if seen

1332

client.checked_ok()

1609

1333

if self.server.use_dbus:

1610

1334

# Emit D-Bus signal

1611

1335

client.GotSecret()

1678

1402

# Convert the buffer to a Python bytestring

1679

1403

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

1680

1404

# Convert the bytestring to hexadecimal notation

1681

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

1405

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

1682

1406

return hex_fpr

1683

1407

1684

1408

1687

1411

def sub_process_main(self, request, address):

1688

1412

try:

1689

1413

self.finish_request(request, address)

1690

except Exception:

1414

except:

1691

1415

self.handle_error(request, address)

1692

1416

self.close_request(request)

1693

1417

1694

1418

def process_request(self, request, address):

1695

1419

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

1696

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

1697

args = (request,

1698

address))

1699

proc.start()

1700

return proc

1701

1420

multiprocessing.Process(target = self.sub_process_main,

1421

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

1702

1422

1703

1423

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1704

1424

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

1708

1428

This function creates a new pipe in self.pipe

1709

1429

"""

1710

1430

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1711

1712

proc = MultiprocessingMixIn.process_request(self, request,

1713

client_address)

1431

1432

super(MultiprocessingMixInWithPipe,

1433

self).process_request(request, client_address)

1714

1434

self.child_pipe.close()

1715

self.add_pipe(parent_pipe, proc)

1716

1717

def add_pipe(self, parent_pipe, proc):

1435

self.add_pipe(parent_pipe)

1436

1437

def add_pipe(self, parent_pipe):

1718

1438

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

1719

1439

raise NotImplementedError

1720

1440

1721

1722

1441

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1723

1442

socketserver.TCPServer, object):

1724

1443

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

1798

1517

self.enabled = False

1799

1518

self.clients = clients

1800

1519

if self.clients is None:

1801

self.clients = {}

1520

self.clients = set()

1802

1521

self.use_dbus = use_dbus

1803

1522

self.gnutls_priority = gnutls_priority

1804

1523

IPv6_TCPServer.__init__(self, server_address,

1808

1527

def server_activate(self):

1809

1528

if self.enabled:

1810

1529

return socketserver.TCPServer.server_activate(self)

1811

1812

1530

def enable(self):

1813

1531

self.enabled = True

1814

1815

def add_pipe(self, parent_pipe, proc):

1532

def add_pipe(self, parent_pipe):

1816

1533

# Call "handle_ipc" for both data and EOF events

1817

1534

gobject.io_add_watch(parent_pipe.fileno(),

1818

1535

gobject.IO_IN | gobject.IO_HUP,

1819

1536

functools.partial(self.handle_ipc,

1820

parent_pipe =

1821

parent_pipe,

1822

proc = proc))

1823

1537

parent_pipe = parent_pipe))

1538

1824

1539

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

1825

proc = None, client_object=None):

1540

client_object=None):

1826

1541

condition_names = {

1827

1542

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

1828

1543

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

1837

1552

for cond, name in

1838

1553

condition_names.iteritems()

1839

1554

if cond & condition)

1840

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

1555

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

1841

1556

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

1842

# Wait for other process to exit

1843

proc.join()

1844

1557

return False

1845

1558

1846

1559

# Read a request from the child

1851

1564

fpr = request[1]

1852

1565

address = request[2]

1853

1566

1854

for c in self.clients.itervalues():

1567

for c in self.clients:

1855

1568

if c.fingerprint == fpr:

1856

1569

client = c

1857

1570

break

1860

1573

"dress: %s", fpr, address)

1861

1574

if self.use_dbus:

1862

1575

# Emit D-Bus signal

1863

mandos_dbus_service.ClientNotFound(fpr,

1864

address[0])

1576

mandos_dbus_service.ClientNotFound(fpr, address[0])

1865

1577

parent_pipe.send(False)

1866

1578

return False

1867

1579

1868

1580

gobject.io_add_watch(parent_pipe.fileno(),

1869

1581

gobject.IO_IN | gobject.IO_HUP,

1870

1582

functools.partial(self.handle_ipc,

1871

parent_pipe =

1872

parent_pipe,

1873

proc = proc,

1874

client_object =

1875

client))

1583

parent_pipe = parent_pipe,

1584

client_object = client))

1876

1585

parent_pipe.send(True)

1877

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

1878

# same fileno

1586

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

1879

1587

return False

1880

1588

if command == 'funcall':

1881

1589

funcname = request[1]

1882

1590

args = request[2]

1883

1591

kwargs = request[3]

1884

1592

1885

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

1886

funcname)(*args,

1887

**kwargs)))

1888

1593

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

1594

1889

1595

if command == 'getattr':

1890

1596

attrname = request[1]

1891

1597

if callable(client_object.__getattribute__(attrname)):

1892

1598

parent_pipe.send(('function',))

1893

1599

else:

1894

parent_pipe.send(('data', client_object

1895

.__getattribute__(attrname)))

1600

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

1896

1601

1897

1602

if command == 'setattr':

1898

1603

attrname = request[1]

1899

1604

value = request[2]

1900

1605

setattr(client_object, attrname, value)

1901

1606

1902

1607

return True

1903

1608

1904

1609

1941

1646

return timevalue

1942

1647

1943

1648

1649

def if_nametoindex(interface):

1650

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

1651

1652

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

1653

global if_nametoindex

1654

try:

1655

if_nametoindex = (ctypes.cdll.LoadLibrary

1656

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

1657

.if_nametoindex)

1658

except (OSError, AttributeError):

1659

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

1660

def if_nametoindex(interface):

1661

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

1662

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

1663

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

1664

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1665

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

1666

interface))

1667

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

1668

ifreq[16:20])[0]

1669

return interface_index

1670

return if_nametoindex(interface)

1671

1672

1944

1673

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

1945

1674

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

1946

1675

2001

1730

" system bus interface")

2002

1731

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

2003

1732

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

2004

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

2005

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

2006

" state")

2007

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

2008

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

2009

2010

1733

options = parser.parse_args()

2011

1734

2012

1735

if options.check:

2025

1748

"use_dbus": "True",

2026

1749

"use_ipv6": "True",

2027

1750

"debuglevel": "",

2028

"restore": "True",

2029

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

2030

1751

}

2031

1752

2032

1753

# Parse config file for server-global settings

2049

1770

# options, if set.

2050

1771

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

2051

1772

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

2052

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

2053

"statedir"):

1773

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

2054

1774

value = getattr(options, option)

2055

1775

if value is not None:

2056

1776

server_settings[option] = value

2068

1788

debuglevel = server_settings["debuglevel"]

2069

1789

use_dbus = server_settings["use_dbus"]

2070

1790

use_ipv6 = server_settings["use_ipv6"]

2071

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

2072

stored_state_file)

2073

2074

if debug:

2075

initlogger(debug, logging.DEBUG)

2076

else:

2077

if not debuglevel:

2078

initlogger(debug)

2079

else:

2080

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

2081

initlogger(debug, level)

2082

1791

2083

1792

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

2084

1793

syslogger.setFormatter(logging.Formatter

2085

1794

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

2087

1796

% server_settings["servicename"]))

2088

1797

2089

1798

# Parse config file with clients

2090

client_config = configparser.SafeConfigParser(Client

2091

.client_defaults)

1799

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

1800

"interval": "5m",

1801

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

1802

"host": "",

1803

"approval_delay": "0s",

1804

"approval_duration": "1s",

1805

}

1806

client_config = configparser.SafeConfigParser(client_defaults)

2092

1807

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

2093

1808

"clients.conf"))

2094

1809

2132

1847

if error[0] != errno.EPERM:

2133

1848

raise error

2134

1849

1850

if not debug and not debuglevel:

1851

syslogger.setLevel(logging.WARNING)

1852

console.setLevel(logging.WARNING)

1853

if debuglevel:

1854

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

1855

syslogger.setLevel(level)

1856

console.setLevel(level)

1857

2135

1858

if debug:

2136

1859

# Enable all possible GnuTLS debugging

2137

1860

2151

1874

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

2152

1875

if null > 2:

2153

1876

os.close(null)

1877

else:

1878

# No console logging

1879

logger.removeHandler(console)

2154

1880

2155

1881

# Need to fork before connecting to D-Bus

2156

1882

if not debug:

2157

1883

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

2158

1884

daemon()

2159

1885

2160

gobject.threads_init()

2161

2162

1886

global main_loop

2163

1887

# From the Avahi example code

2164

1888

DBusGMainLoop(set_as_default=True )

2167

1891

# End of Avahi example code

2168

1892

if use_dbus:

2169

1893

try:

2170

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

1894

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

2171

1895

bus, do_not_queue=True)

2172

old_bus_name = (dbus.service.BusName

2173

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

2174

do_not_queue=True))

2175

1896

except dbus.exceptions.NameExistsException as e:

2176

1897

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

2177

1898

use_dbus = False

2178

1899

server_settings["use_dbus"] = False

2179

1900

tcp_server.use_dbus = False

2180

1901

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2181

service = AvahiServiceToSyslog(name =

2182

server_settings["servicename"],

2183

servicetype = "_mandos._tcp",

2184

protocol = protocol, bus = bus)

1902

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

1903

servicetype = "_mandos._tcp",

1904

protocol = protocol, bus = bus)

2185

1905

if server_settings["interface"]:

2186

1906

service.interface = (if_nametoindex

2187

1907

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

2191

1911

2192

1912

client_class = Client

2193

1913

if use_dbus:

2194

client_class = functools.partial(ClientDBusTransitional,

2195

bus = bus)

2196

2197

client_settings = Client.config_parser(client_config)

2198

old_client_settings = {}

2199

clients_data = {}

2200

2201

# Get client data and settings from last running state.

2202

if server_settings["restore"]:

2203

try:

2204

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

2205

clients_data, old_client_settings = (pickle.load

2206

(stored_state))

2207

os.remove(stored_state_path)

2208

except IOError as e:

2209

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

2210

.format(e))

2211

if e.errno != errno.ENOENT:

2212

raise

2213

except EOFError as e:

2214

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

2215

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

2216

2217

with PGPEngine() as pgp:

2218

for client_name, client in clients_data.iteritems():

2219

# Decide which value to use after restoring saved state.

2220

# We have three different values: Old config file,

2221

# new config file, and saved state.

2222

# New config value takes precedence if it differs from old

2223

# config value, otherwise use saved state.

2224

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

2225

try:

2226

# For each value in new config, check if it

2227

# differs from the old config value (Except for

2228

# the "secret" attribute)

2229

if (name != "secret" and

2230

value != old_client_settings[client_name]

2231

[name]):

2232

client[name] = value

2233

except KeyError:

2234

pass

2235

2236

# Clients who has passed its expire date can still be

2237

# enabled if its last checker was successful. Clients

2238

# whose checker succeeded before we stored its state is

2239

# assumed to have successfully run all checkers during

2240

# downtime.

2241

if client["enabled"]:

2242

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

2243

if not client["last_checked_ok"]:

2244

logger.warning(

2245

"disabling client {0} - Client never "

2246

"performed a successful checker"

2247

.format(client_name))

2248

client["enabled"] = False

2249

elif client["last_checker_status"] != 0:

2250

logger.warning(

2251

"disabling client {0} - Client "

2252

"last checker failed with error code {1}"

2253

.format(client_name,

2254

client["last_checker_status"]))

2255

client["enabled"] = False

2256

else:

2257

client["expires"] = (datetime.datetime

2258

.utcnow()

2259

+ client["timeout"])

2260

logger.debug("Last checker succeeded,"

2261

" keeping {0} enabled"

2262

.format(client_name))

1914

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

1915

def client_config_items(config, section):

1916

special_settings = {

1917

"approved_by_default":

1918

lambda: config.getboolean(section,

1919

"approved_by_default"),

1920

}

1921

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

2263

1922

try:

2264

client["secret"] = (

2265

pgp.decrypt(client["encrypted_secret"],

2266

client_settings[client_name]

2267

["secret"]))

2268

except PGPError:

2269

# If decryption fails, we use secret from new settings

2270

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

2271

.format(client_name))

2272

client["secret"] = (

2273

client_settings[client_name]["secret"])

2274

2275

2276

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

2277

for client_name in (set(old_client_settings)

2278

- set(client_settings)):

2279

del clients_data[client_name]

2280

for client_name in (set(client_settings)

2281

- set(old_client_settings)):

2282

clients_data[client_name] = client_settings[client_name]

2283

2284

# Create all client objects

2285

for client_name, client in clients_data.iteritems():

2286

tcp_server.clients[client_name] = client_class(

2287

name = client_name, settings = client)

2288

1923

yield (name, special_settings[name]())

1924

except KeyError:

1925

yield (name, value)

1926

1927

tcp_server.clients.update(set(

1928

client_class(name = section,

1929

config= dict(client_config_items(

1930

client_config, section)))

1931

for section in client_config.sections()))

2289

1932

if not tcp_server.clients:

2290

1933

logger.warning("No clients defined")

2291

1934

2302

1945

# "pidfile" was never created

2303

1946

pass

2304

1947

del pidfilename

1948

2305

1949

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

2306

1950

2307

1951

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

2308

1952

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

2309

1953

2312

1956

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

2313

1957

def __init__(self):

2314

1958

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

2315

_interface = "se.recompile.Mandos"

1959

_interface = "se.bsnet.fukt.Mandos"

2316

1960

2317

1961

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

2318

1962

def ClientAdded(self, objpath):

2333

1977

def GetAllClients(self):

2334

1978

"D-Bus method"

2335

1979

return dbus.Array(c.dbus_object_path

2336

for c in

2337

tcp_server.clients.itervalues())

1980

for c in tcp_server.clients)

2338

1981

2339

1982

@dbus.service.method(_interface,

2340

1983

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

2342

1985

"D-Bus method"

2343

1986

return dbus.Dictionary(

2344

1987

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

2345

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

1988

for c in tcp_server.clients),

2346

1989

signature="oa{sv}")

2347

1990

2348

1991

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

2349

1992

def RemoveClient(self, object_path):

2350

1993

"D-Bus method"

2351

for c in tcp_server.clients.itervalues():

1994

for c in tcp_server.clients:

2352

1995

if c.dbus_object_path == object_path:

2353

del tcp_server.clients[c.name]

1996

tcp_server.clients.remove(c)

2354

1997

c.remove_from_connection()

2355

1998

# Don't signal anything except ClientRemoved

2356

1999

c.disable(quiet=True)

2361

2004

2362

2005

del _interface

2363

2006

2364

class MandosDBusServiceTransitional(MandosDBusService):

2365

__metaclass__ = AlternateDBusNamesMetaclass

2366

mandos_dbus_service = MandosDBusServiceTransitional()

2007

mandos_dbus_service = MandosDBusService()

2367

2008

2368

2009

def cleanup():

2369

2010

"Cleanup function; run on exit"

2370

2011

service.cleanup()

2371

2012

2372

multiprocessing.active_children()

2373

if not (tcp_server.clients or client_settings):

2374

return

2375

2376

# Store client before exiting. Secrets are encrypted with key

2377

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

2378

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

2379

clients = {}

2380

with PGPEngine() as pgp:

2381

for client in tcp_server.clients.itervalues():

2382

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

2383

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

2384

key)

2385

client_dict = {}

2386

2387

# A list of attributes that can not be pickled

2388

# + secret.

2389

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

2390

"checker"))

2391

for name, typ in (inspect.getmembers

2392

(dbus.service.Object)):

2393

exclude.add(name)

2394

2395

client_dict["encrypted_secret"] = (client

2396

.encrypted_secret)

2397

for attr in client.client_structure:

2398

if attr not in exclude:

2399

client_dict[attr] = getattr(client, attr)

2400

2401

clients[client.name] = client_dict

2402

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

2403

2404

try:

2405

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

2406

prefix="clients-",

2407

dir=os.path.dirname

2408

(stored_state_path))

2409

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

2410

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

2411

os.rename(tempname, stored_state_path)

2412

except (IOError, OSError) as e:

2413

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

2414

.format(e))

2415

if not debug:

2416

try:

2417

os.remove(tempname)

2418

except NameError:

2419

pass

2420

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

2421

errno.EEXIST)):

2422

raise e

2423

2424

# Delete all clients, and settings from config

2425

2013

while tcp_server.clients:

2426

name, client = tcp_server.clients.popitem()

2014

client = tcp_server.clients.pop()

2427

2015

if use_dbus:

2428

2016

client.remove_from_connection()

2017

client.disable_hook = None

2429

2018

# Don't signal anything except ClientRemoved

2430

2019

client.disable(quiet=True)

2431

2020

if use_dbus:

2432

2021

# Emit D-Bus signal

2433

mandos_dbus_service.ClientRemoved(client

2434

.dbus_object_path,

2022

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2435

2023

client.name)

2436

client_settings.clear()

2437

2024

2438

2025

atexit.register(cleanup)

2439

2026

2440

for client in tcp_server.clients.itervalues():

2027

for client in tcp_server.clients:

2441

2028

if use_dbus:

2442

2029

# Emit D-Bus signal

2443

2030

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2444

# Need to initiate checking of clients

2445

if client.enabled:

2446

client.init_checker()

2031

client.enable()

2447

2032

2448

2033

tcp_server.enable()

2449

2034

tcp_server.server_activate()