/mandos/trunk : revision 550

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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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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) as e:

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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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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")

485

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:

491

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

492

% section)

493

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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

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client["last_approval_request"] = None

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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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510

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

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

329

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attribute."""

330

513

self.name = name

331

if config is None:

332

config = {}

514

# adding all client settings

515

for setting, value in settings.iteritems():

516

setattr(self, setting, value)

517

518

if self.enabled:

519

if not hasattr(self, "last_enabled"):

520

self.last_enabled = datetime.datetime.utcnow()

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

333

528

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

334

529

# Uppercase and remove spaces from fingerprint for later

335

530

# comparison purposes with return value from the fingerprint()

336

531

# function

337

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

338

.replace(" ", ""))

339

532

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

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

533

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

534

datetime.datetime.utcnow())

535

536

# attributes specific for this server instance

359

537

self.checker = None

360

538

self.checker_initiator_tag = None

361

539

self.disable_initiator_tag = None

362

540

self.checker_callback_tag = None

363

self.checker_command = config["checker"]

364

541

self.current_checker_command = None

365

self.last_connect = None

366

self._approved = None

367

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

368

True)

542

self.approved = None

369

543

self.approvals_pending = 0

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())

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)

375

558

559

# Send notice to process children that client state has changed

376

560

def send_changedstate(self):

377

self.changedstate.acquire()

378

self.changedstate.notify_all()

379

self.changedstate.release()

380

561

with self.changedstate:

562

self.changedstate.notify_all()

563

381

564

def enable(self):

382

565

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

383

566

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

384

567

# Already enabled

385

568

return

386

569

self.send_changedstate()

570

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

571

self.enabled = True

387

572

self.last_enabled = datetime.datetime.utcnow()

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()

573

self.init_checker()

400

574

401

575

def disable(self, quiet=True):

402

576

"""Disable this client."""

409

583

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

410

584

gobject.source_remove(self.disable_initiator_tag)

411

585

self.disable_initiator_tag = None

586

self.expires = None

412

587

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

413

588

gobject.source_remove(self.checker_initiator_tag)

414

589

self.checker_initiator_tag = None

415

590

self.stop_checker()

416

if self.disable_hook:

417

self.disable_hook(self)

418

591

self.enabled = False

419

592

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

420

593

return False

421

594

422

595

def __del__(self):

423

self.disable_hook = None

424

596

self.disable()

425

597

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

426

611

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

427

612

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

428

613

self.checker_callback_tag = None

429

614

self.checker = None

430

615

if os.WIFEXITED(condition):

431

exitstatus = os.WEXITSTATUS(condition)

432

if exitstatus == 0:

616

self.last_checker_status = os.WEXITSTATUS(condition)

617

if self.last_checker_status == 0:

433

618

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

434

619

vars(self))

435

620

self.checked_ok()

437

622

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

438

623

vars(self))

439

624

else:

625

self.last_checker_status = -1

440

626

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

441

627

vars(self))

442

628

443

def checked_ok(self):

629

def checked_ok(self, timeout=None):

444

630

"""Bump up the timeout for this client.

445

631

446

632

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

447

633

alive and well.

448

634

"""

635

if timeout is None:

636

timeout = self.timeout

449

637

self.last_checked_ok = datetime.datetime.utcnow()

450

gobject.source_remove(self.disable_initiator_tag)

451

self.disable_initiator_tag = (gobject.timeout_add

452

(self.timeout_milliseconds(),

453

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

454

645

455

646

def need_approval(self):

456

647

self.last_approval_request = datetime.datetime.utcnow()

496

687

'replace')))

497

688

for attr in

498

689

self.runtime_expansions)

499

690

500

691

try:

501

692

command = self.checker_command % escaped_attrs

502

693

except TypeError as error:

548

739

raise

549

740

self.checker = None

550

741

742

551

743

def dbus_service_property(dbus_interface, signature="v",

552

744

access="readwrite", byte_arrays=False):

553

745

"""Decorators for marking methods of a DBusObjectWithProperties to

599

791

600

792

class DBusObjectWithProperties(dbus.service.Object):

601

793

"""A D-Bus object with properties.

602

794

603

795

Classes inheriting from this can use the dbus_service_property

604

796

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

605

797

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

612

804

def _get_all_dbus_properties(self):

613

805

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

614

806

"""

615

return ((prop._dbus_name, prop)

807

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

808

for cls in self.__class__.__mro__

616

809

for name, prop in

617

inspect.getmembers(self, self._is_dbus_property))

810

inspect.getmembers(cls, self._is_dbus_property))

618

811

619

812

def _get_dbus_property(self, interface_name, property_name):

620

813

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

621

814

property with the specified name and interface.

622

815

"""

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

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

633

823

# No such property

634

824

raise DBusPropertyNotFound(self.dbus_object_path + ":"

635

825

+ interface_name + "."

660

850

# signatures other than "ay".

661

851

if prop._dbus_signature != "ay":

662

852

raise ValueError

663

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

664

for byte in value))

853

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

854

for byte in value))

665

855

prop(value)

666

856

667

857

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

669

859

def GetAll(self, interface_name):

670

860

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

671

861

standard.

672

862

673

863

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

674

864

"""

675

all = {}

865

properties = {}

676

866

for name, prop in self._get_all_dbus_properties():

677

867

if (interface_name

678

868

and interface_name != prop._dbus_interface):

683

873

continue

684

874

value = prop()

685

875

if not hasattr(value, "variant_level"):

686

all[name] = value

876

properties[name] = value

687

877

continue

688

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

689

value.variant_level+1)

690

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")

691

881

692

882

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

693

883

out_signature="s",

737

927

return xmlstring

738

928

739

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

740

1036

class ClientDBus(Client, DBusObjectWithProperties):

741

1037

"""A Client class using D-Bus

742

1038

751

1047

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

752

1048

753

1049

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

754

self._approvals_pending = 0

755

1050

self.bus = bus

756

1051

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

1052

self._approvals_pending = 0

1053

1054

self._approvals_pending = 0

757

1055

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

758

1056

# the D-Bus

759

1057

client_object_name = unicode(self.name).translate(

764

1062

DBusObjectWithProperties.__init__(self, self.bus,

765

1063

self.dbus_object_path)

766

1064

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

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

810

1131

811

1132

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

812

1133

try:

821

1142

*args, **kwargs):

822

1143

self.checker_callback_tag = None

823

1144

self.checker = None

824

# Emit D-Bus signal

825

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

826

dbus.Boolean(False, variant_level=1))

827

1145

if os.WIFEXITED(condition):

828

1146

exitstatus = os.WEXITSTATUS(condition)

829

1147

# Emit D-Bus signal

839

1157

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

840

1158

*args, **kwargs)

841

1159

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

859

1160

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

860

1161

old_checker = self.checker

861

1162

if self.checker is not None:

868

1169

and old_checker_pid != self.checker.pid):

869

1170

# Emit D-Bus signal

870

1171

self.CheckerStarted(self.current_checker_command)

871

self.PropertyChanged(

872

dbus.String("CheckerRunning"),

873

dbus.Boolean(True, variant_level=1))

874

1172

return r

875

1173

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

885

1174

def _reset_approved(self):

886

self._approved = None

1175

self.approved = None

887

1176

return False

888

1177

889

1178

def approve(self, value=True):

890

1179

self.send_changedstate()

891

self._approved = value

892

gobject.timeout_add(self._timedelta_to_milliseconds

1180

self.approved = value

1181

gobject.timeout_add(timedelta_to_milliseconds

893

1182

(self.approval_duration),

894

1183

self._reset_approved)

895

1184

896

1185

897

1186

## D-Bus methods, signals & properties

898

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

1187

_interface = "se.recompile.Mandos.Client"

899

1188

900

1189

## Signals

901

1190

938

1227

"D-Bus signal"

939

1228

return self.need_approval()

940

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

941

1238

## Methods

942

1239

943

1240

# Approve - method

987

1284

if value is None: # get

988

1285

return dbus.Boolean(self.approved_by_default)

989

1286

self.approved_by_default = bool(value)

990

# Emit D-Bus signal

991

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

992

dbus.Boolean(value, variant_level=1))

993

1287

994

1288

# ApprovalDelay - property

995

1289

@dbus_service_property(_interface, signature="t",

998

1292

if value is None: # get

999

1293

return dbus.UInt64(self.approval_delay_milliseconds())

1000

1294

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))

1004

1295

1005

1296

# ApprovalDuration - property

1006

1297

@dbus_service_property(_interface, signature="t",

1007

1298

access="readwrite")

1008

1299

def ApprovalDuration_dbus_property(self, value=None):

1009

1300

if value is None: # get

1010

return dbus.UInt64(self._timedelta_to_milliseconds(

1301

return dbus.UInt64(timedelta_to_milliseconds(

1011

1302

self.approval_duration))

1012

1303

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))

1016

1304

1017

1305

# Name - property

1018

1306

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

1030

1318

def Host_dbus_property(self, value=None):

1031

1319

if value is None: # get

1032

1320

return dbus.String(self.host)

1033

self.host = value

1034

# Emit D-Bus signal

1035

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

1036

dbus.String(value, variant_level=1))

1321

self.host = unicode(value)

1037

1322

1038

1323

# Created - property

1039

1324

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

1040

1325

def Created_dbus_property(self):

1041

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

1326

return datetime_to_dbus(self.created)

1042

1327

1043

1328

# LastEnabled - property

1044

1329

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

1045

1330

def LastEnabled_dbus_property(self):

1046

if self.last_enabled is None:

1047

return dbus.String("")

1048

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

1331

return datetime_to_dbus(self.last_enabled)

1049

1332

1050

1333

# Enabled - property

1051

1334

@dbus_service_property(_interface, signature="b",

1065

1348

if value is not None:

1066

1349

self.checked_ok()

1067

1350

return

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))

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)

1072

1357

1073

1358

# LastApprovalRequest - property

1074

1359

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

1075

1360

def LastApprovalRequest_dbus_property(self):

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))

1361

return datetime_to_dbus(self.last_approval_request)

1081

1362

1082

1363

# Timeout - property

1083

1364

@dbus_service_property(_interface, signature="t",

1086

1367

if value is None: # get

1087

1368

return dbus.UInt64(self.timeout_milliseconds())

1088

1369

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

1094

1370

# Reschedule timeout

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))

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)

1109

1397

1110

1398

# Interval - property

1111

1399

@dbus_service_property(_interface, signature="t",

1114

1402

if value is None: # get

1115

1403

return dbus.UInt64(self.interval_milliseconds())

1116

1404

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))

1120

1405

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

1121

1406

return

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

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

1128

1414

# Checker - property

1129

1415

@dbus_service_property(_interface, signature="s",

1130

1416

access="readwrite")

1131

1417

def Checker_dbus_property(self, value=None):

1132

1418

if value is None: # get

1133

1419

return dbus.String(self.checker_command)

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))

1420

self.checker_command = unicode(value)

1139

1421

1140

1422

# CheckerRunning - property

1141

1423

@dbus_service_property(_interface, signature="b",

1168

1450

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

1169

1451

if not self._pipe.recv():

1170

1452

raise KeyError()

1171

1453

1172

1454

def __getattribute__(self, name):

1173

if(name == '_pipe'):

1455

if name == '_pipe':

1174

1456

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

1175

1457

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

1176

1458

data = self._pipe.recv()

1181

1463

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

1182

1464

return self._pipe.recv()[1]

1183

1465

return func

1184

1466

1185

1467

def __setattr__(self, name, value):

1186

if(name == '_pipe'):

1468

if name == '_pipe':

1187

1469

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

1188

1470

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

1189

1471

1190

1472

1473

class ClientDBusTransitional(ClientDBus):

1474

__metaclass__ = AlternateDBusNamesMetaclass

1475

1476

1191

1477

class ClientHandler(socketserver.BaseRequestHandler, object):

1192

1478

"""A class to handle client connections.

1193

1479

1200

1486

unicode(self.client_address))

1201

1487

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

1202

1488

self.server.child_pipe.fileno())

1203

1489

1204

1490

session = (gnutls.connection

1205

1491

.ClientSession(self.request,

1206

1492

gnutls.connection

1207

1493

.X509Credentials()))

1208

1494

1209

1495

# Note: gnutls.connection.X509Credentials is really a

1210

1496

# generic GnuTLS certificate credentials object so long as

1211

1497

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

1212

1498

# here despite using OpenPGP certificates.

1213

1499

1214

1500

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

1215

1501

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

1216

1502

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

1222

1508

(gnutls.library.functions

1223

1509

.gnutls_priority_set_direct(session._c_object,

1224

1510

priority, None))

1225

1511

1226

1512

# Start communication using the Mandos protocol

1227

1513

# Get protocol number

1228

1514

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

1233

1519

except (ValueError, IndexError, RuntimeError) as error:

1234

1520

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

1235

1521

return

1236

1522

1237

1523

# Start GnuTLS connection

1238

1524

try:

1239

1525

session.handshake()

1243

1529

# established. Just abandon the request.

1244

1530

return

1245

1531

logger.debug("Handshake succeeded")

1246

1532

1247

1533

approval_required = False

1248

1534

try:

1249

1535

try:

1254

1540

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

1255

1541

return

1256

1542

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

1257

1543

1258

1544

try:

1259

1545

client = ProxyClient(child_pipe, fpr,

1260

1546

self.client_address)

1261

1547

except KeyError:

1262

1548

return

1263

1549

1550

if self.server.use_dbus:

1551

# Emit D-Bus signal

1552

client.NewRequest(str(self.client_address))

1553

1264

1554

if client.approval_delay:

1265

1555

delay = client.approval_delay

1266

1556

client.approvals_pending += 1

1272

1562

client.name)

1273

1563

if self.server.use_dbus:

1274

1564

# Emit D-Bus signal

1275

client.Rejected("Disabled")

1565

client.Rejected("Disabled")

1276

1566

return

1277

1567

1278

if client._approved or not client.approval_delay:

1568

if client.approved or not client.approval_delay:

1279

1569

#We are approved or approval is disabled

1280

1570

break

1281

elif client._approved is None:

1571

elif client.approved is None:

1282

1572

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

1283

1573

client.name)

1284

1574

if self.server.use_dbus:

1295

1585

return

1296

1586

1297

1587

#wait until timeout or approved

1298

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

1299

1588

time = datetime.datetime.now()

1300

1589

client.changedstate.acquire()

1301

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

1590

(client.changedstate.wait

1591

(float(client.timedelta_to_milliseconds(delay)

1592

/ 1000)))

1302

1593

client.changedstate.release()

1303

1594

time2 = datetime.datetime.now()

1304

1595

if (time2 - time) >= delay:

1326

1617

sent, len(client.secret)

1327

1618

- (sent_size + sent))

1328

1619

sent_size += sent

1329

1620

1330

1621

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

1331

# bump the timeout as if seen

1332

client.checked_ok()

1622

# bump the timeout using extended_timeout

1623

client.checked_ok(client.extended_timeout)

1333

1624

if self.server.use_dbus:

1334

1625

# Emit D-Bus signal

1335

1626

client.GotSecret()

1402

1693

# Convert the buffer to a Python bytestring

1403

1694

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

1404

1695

# Convert the bytestring to hexadecimal notation

1405

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

1696

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

1406

1697

return hex_fpr

1407

1698

1408

1699

1411

1702

def sub_process_main(self, request, address):

1412

1703

try:

1413

1704

self.finish_request(request, address)

1414

except:

1705

except Exception:

1415

1706

self.handle_error(request, address)

1416

1707

self.close_request(request)

1417

1708

1418

1709

def process_request(self, request, address):

1419

1710

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

1420

multiprocessing.Process(target = self.sub_process_main,

1421

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

1422

1717

1423

1718

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1424

1719

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

1428

1723

This function creates a new pipe in self.pipe

1429

1724

"""

1430

1725

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1431

1432

super(MultiprocessingMixInWithPipe,

1433

self).process_request(request, client_address)

1726

1727

proc = MultiprocessingMixIn.process_request(self, request,

1728

client_address)

1434

1729

self.child_pipe.close()

1435

self.add_pipe(parent_pipe)

1436

1437

def add_pipe(self, parent_pipe):

1730

self.add_pipe(parent_pipe, proc)

1731

1732

def add_pipe(self, parent_pipe, proc):

1438

1733

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

1439

1734

raise NotImplementedError

1440

1735

1736

1441

1737

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1442

1738

socketserver.TCPServer, object):

1443

1739

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

1517

1813

self.enabled = False

1518

1814

self.clients = clients

1519

1815

if self.clients is None:

1520

self.clients = set()

1816

self.clients = {}

1521

1817

self.use_dbus = use_dbus

1522

1818

self.gnutls_priority = gnutls_priority

1523

1819

IPv6_TCPServer.__init__(self, server_address,

1527

1823

def server_activate(self):

1528

1824

if self.enabled:

1529

1825

return socketserver.TCPServer.server_activate(self)

1826

1530

1827

def enable(self):

1531

1828

self.enabled = True

1532

def add_pipe(self, parent_pipe):

1829

1830

def add_pipe(self, parent_pipe, proc):

1533

1831

# Call "handle_ipc" for both data and EOF events

1534

1832

gobject.io_add_watch(parent_pipe.fileno(),

1535

1833

gobject.IO_IN | gobject.IO_HUP,

1536

1834

functools.partial(self.handle_ipc,

1537

parent_pipe = parent_pipe))

1538

1835

parent_pipe =

1836

parent_pipe,

1837

proc = proc))

1838

1539

1839

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

1540

client_object=None):

1840

proc = None, client_object=None):

1541

1841

condition_names = {

1542

1842

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

1543

1843

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

1552

1852

for cond, name in

1553

1853

condition_names.iteritems()

1554

1854

if cond & condition)

1555

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

1855

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

1556

1856

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

1857

# Wait for other process to exit

1858

proc.join()

1557

1859

return False

1558

1860

1559

1861

# Read a request from the child

1564

1866

fpr = request[1]

1565

1867

address = request[2]

1566

1868

1567

for c in self.clients:

1869

for c in self.clients.itervalues():

1568

1870

if c.fingerprint == fpr:

1569

1871

client = c

1570

1872

break

1573

1875

"dress: %s", fpr, address)

1574

1876

if self.use_dbus:

1575

1877

# Emit D-Bus signal

1576

mandos_dbus_service.ClientNotFound(fpr, address[0])

1878

mandos_dbus_service.ClientNotFound(fpr,

1879

address[0])

1577

1880

parent_pipe.send(False)

1578

1881

return False

1579

1882

1580

1883

gobject.io_add_watch(parent_pipe.fileno(),

1581

1884

gobject.IO_IN | gobject.IO_HUP,

1582

1885

functools.partial(self.handle_ipc,

1583

parent_pipe = parent_pipe,

1584

client_object = client))

1886

parent_pipe =

1887

parent_pipe,

1888

proc = proc,

1889

client_object =

1890

client))

1585

1891

parent_pipe.send(True)

1586

# 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

1587

1894

return False

1588

1895

if command == 'funcall':

1589

1896

funcname = request[1]

1590

1897

args = request[2]

1591

1898

kwargs = request[3]

1592

1899

1593

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

1594

1900

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

1901

funcname)(*args,

1902

**kwargs)))

1903

1595

1904

if command == 'getattr':

1596

1905

attrname = request[1]

1597

1906

if callable(client_object.__getattribute__(attrname)):

1598

1907

parent_pipe.send(('function',))

1599

1908

else:

1600

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

1909

parent_pipe.send(('data', client_object

1910

.__getattribute__(attrname)))

1601

1911

1602

1912

if command == 'setattr':

1603

1913

attrname = request[1]

1604

1914

value = request[2]

1605

1915

setattr(client_object, attrname, value)

1606

1916

1607

1917

return True

1608

1918

1609

1919

1646

1956

return timevalue

1647

1957

1648

1958

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

1673

1959

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

1674

1960

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

1675

1961

1730

2016

" system bus interface")

1731

2017

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

1732

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

1733

2025

options = parser.parse_args()

1734

2026

1735

2027

if options.check:

1748

2040

"use_dbus": "True",

1749

2041

"use_ipv6": "True",

1750

2042

"debuglevel": "",

2043

"restore": "True",

2044

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

1751

2045

}

1752

2046

1753

2047

# Parse config file for server-global settings

1770

2064

# options, if set.

1771

2065

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

1772

2066

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

1773

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

2067

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

2068

"statedir"):

1774

2069

value = getattr(options, option)

1775

2070

if value is not None:

1776

2071

server_settings[option] = value

1788

2083

debuglevel = server_settings["debuglevel"]

1789

2084

use_dbus = server_settings["use_dbus"]

1790

2085

use_ipv6 = server_settings["use_ipv6"]

1791

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

1792

2098

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

1793

2099

syslogger.setFormatter(logging.Formatter

1794

2100

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

1796

2102

% server_settings["servicename"]))

1797

2103

1798

2104

# Parse config file with clients

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)

2105

client_config = configparser.SafeConfigParser(Client

2106

.client_defaults)

1807

2107

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

1808

2108

"clients.conf"))

1809

2109

1847

2147

if error[0] != errno.EPERM:

1848

2148

raise error

1849

2149

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

1858

2150

if debug:

1859

2151

# Enable all possible GnuTLS debugging

1860

2152

1874

2166

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

1875

2167

if null > 2:

1876

2168

os.close(null)

1877

else:

1878

# No console logging

1879

logger.removeHandler(console)

1880

2169

1881

2170

# Need to fork before connecting to D-Bus

1882

2171

if not debug:

1883

2172

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

1884

2173

daemon()

1885

2174

2175

gobject.threads_init()

2176

1886

2177

global main_loop

1887

2178

# From the Avahi example code

1888

2179

DBusGMainLoop(set_as_default=True )

1891

2182

# End of Avahi example code

1892

2183

if use_dbus:

1893

2184

try:

1894

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

2185

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

1895

2186

bus, do_not_queue=True)

2187

old_bus_name = (dbus.service.BusName

2188

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

2189

do_not_queue=True))

1896

2190

except dbus.exceptions.NameExistsException as e:

1897

2191

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

1898

2192

use_dbus = False

1899

2193

server_settings["use_dbus"] = False

1900

2194

tcp_server.use_dbus = False

1901

2195

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

1902

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

1903

servicetype = "_mandos._tcp",

1904

protocol = protocol, bus = bus)

2196

service = AvahiServiceToSyslog(name =

2197

server_settings["servicename"],

2198

servicetype = "_mandos._tcp",

2199

protocol = protocol, bus = bus)

1905

2200

if server_settings["interface"]:

1906

2201

service.interface = (if_nametoindex

1907

2202

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

1911

2206

1912

2207

client_class = Client

1913

2208

if use_dbus:

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):

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"]))

1922

2277

try:

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()))

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

1932

2303

if not tcp_server.clients:

1933

2304

logger.warning("No clients defined")

1934

2305

1945

2316

# "pidfile" was never created

1946

2317

pass

1947

2318

del pidfilename

1948

1949

2319

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

1950

2320

1951

2321

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

1952

2322

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

1953

2323

1956

2326

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

1957

2327

def __init__(self):

1958

2328

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

1959

_interface = "se.bsnet.fukt.Mandos"

2329

_interface = "se.recompile.Mandos"

1960

2330

1961

2331

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

1962

2332

def ClientAdded(self, objpath):

1977

2347

def GetAllClients(self):

1978

2348

"D-Bus method"

1979

2349

return dbus.Array(c.dbus_object_path

1980

for c in tcp_server.clients)

2350

for c in

2351

tcp_server.clients.itervalues())

1981

2352

1982

2353

@dbus.service.method(_interface,

1983

2354

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

1985

2356

"D-Bus method"

1986

2357

return dbus.Dictionary(

1987

2358

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

1988

for c in tcp_server.clients),

2359

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

1989

2360

signature="oa{sv}")

1990

2361

1991

2362

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

1992

2363

def RemoveClient(self, object_path):

1993

2364

"D-Bus method"

1994

for c in tcp_server.clients:

2365

for c in tcp_server.clients.itervalues():

1995

2366

if c.dbus_object_path == object_path:

1996

tcp_server.clients.remove(c)

2367

del tcp_server.clients[c.name]

1997

2368

c.remove_from_connection()

1998

2369

# Don't signal anything except ClientRemoved

1999

2370

c.disable(quiet=True)

2004

2375

2005

2376

del _interface

2006

2377

2007

mandos_dbus_service = MandosDBusService()

2378

class MandosDBusServiceTransitional(MandosDBusService):

2379

__metaclass__ = AlternateDBusNamesMetaclass

2380

mandos_dbus_service = MandosDBusServiceTransitional()

2008

2381

2009

2382

def cleanup():

2010

2383

"Cleanup function; run on exit"

2011

2384

service.cleanup()

2012

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

2013

2439

while tcp_server.clients:

2014

client = tcp_server.clients.pop()

2440

name, client = tcp_server.clients.popitem()

2015

2441

if use_dbus:

2016

2442

client.remove_from_connection()

2017

client.disable_hook = None

2018

2443

# Don't signal anything except ClientRemoved

2019

2444

client.disable(quiet=True)

2020

2445

if use_dbus:

2021

2446

# Emit D-Bus signal

2022

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2447

mandos_dbus_service.ClientRemoved(client

2448

.dbus_object_path,

2023

2449

client.name)

2450

client_settings.clear()

2024

2451

2025

2452

atexit.register(cleanup)

2026

2453

2027

for client in tcp_server.clients:

2454

for client in tcp_server.clients.itervalues():

2028

2455

if use_dbus:

2029

2456

# Emit D-Bus signal

2030

2457

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2031

client.enable()

2458

# Need to initiate checking of clients

2459

if client.enabled:

2460

client.init_checker()

2032

2461

2033

2462

tcp_server.enable()

2034

2463

tcp_server.server_activate()