/mandos/trunk : revision 502

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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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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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"""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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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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"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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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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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 _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 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 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")

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elif "secfile" in section:

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

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(section["secfile"])),

488

"rb") as secfile:

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

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else:

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

492

% section)

493

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

504

client["last_checker_status"] = None

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return settings

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

330

return _timedelta_to_milliseconds(self.approval_delay)

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

510

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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

336

self.name = name

514

# 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

337

if config is None:

338

config = {}

528

339

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

529

340

# Uppercase and remove spaces from fingerprint for later

530

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# comparison purposes with return value from the fingerprint()

531

342

# function

343

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

344

.replace(" ", ""))

532

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

533

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

534

datetime.datetime.utcnow())

535

536

# attributes specific for this server instance

346

if "secret" in config:

347

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

348

elif "secfile" in config:

349

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

350

(config["secfile"])),

351

"rb") as secfile:

352

self.secret = secfile.read()

353

else:

354

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

355

% self.name)

356

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

357

self.created = datetime.datetime.utcnow()

358

self.enabled = False

359

self.last_approval_request = None

360

self.last_enabled = None

361

self.last_checked_ok = None

362

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

363

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

364

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

365

self.disable_hook = disable_hook

537

366

self.checker = None

538

367

self.checker_initiator_tag = None

539

368

self.disable_initiator_tag = None

369

self.expires = None

540

370

self.checker_callback_tag = None

371

self.checker_command = config["checker"]

541

372

self.current_checker_command = None

542

self.approved = None

373

self.last_connect = None

374

self._approved = None

375

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

376

True)

543

377

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)

378

self.approval_delay = string_to_delta(

379

config["approval_delay"])

380

self.approval_duration = string_to_delta(

381

config["approval_duration"])

382

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

558

383

559

# Send notice to process children that client state has changed

560

384

def send_changedstate(self):

561

with self.changedstate:

562

self.changedstate.notify_all()

563

385

self.changedstate.acquire()

386

self.changedstate.notify_all()

387

self.changedstate.release()

388

564

389

def enable(self):

565

390

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

566

391

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

567

392

# Already enabled

568

393

return

569

394

self.send_changedstate()

395

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

396

# and every interval from then on.

397

self.checker_initiator_tag = (gobject.timeout_add

398

(self.interval_milliseconds(),

399

self.start_checker))

400

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

570

401

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

402

self.disable_initiator_tag = (gobject.timeout_add

403

(self.timeout_milliseconds(),

404

self.disable))

571

405

self.enabled = True

572

406

self.last_enabled = datetime.datetime.utcnow()

573

self.init_checker()

407

# Also start a new checker *right now*.

408

self.start_checker()

574

409

575

410

def disable(self, quiet=True):

576

411

"""Disable this client."""

588

423

gobject.source_remove(self.checker_initiator_tag)

589

424

self.checker_initiator_tag = None

590

425

self.stop_checker()

426

if self.disable_hook:

427

self.disable_hook(self)

591

428

self.enabled = False

592

429

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

593

430

return False

594

431

595

432

def __del__(self):

433

self.disable_hook = None

596

434

self.disable()

597

435

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

436

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

612

437

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

613

438

self.checker_callback_tag = None

614

439

self.checker = None

615

440

if os.WIFEXITED(condition):

616

self.last_checker_status = os.WEXITSTATUS(condition)

617

if self.last_checker_status == 0:

441

exitstatus = os.WEXITSTATUS(condition)

442

if exitstatus == 0:

618

443

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

619

444

vars(self))

620

445

self.checked_ok()

622

447

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

623

448

vars(self))

624

449

else:

625

self.last_checker_status = -1

626

450

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

627

451

vars(self))

628

452

635

459

if timeout is None:

636

460

timeout = self.timeout

637

461

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

462

gobject.source_remove(self.disable_initiator_tag)

463

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

464

self.disable_initiator_tag = (gobject.timeout_add

465

(_timedelta_to_milliseconds(timeout),

466

self.disable))

645

467

646

468

def need_approval(self):

647

469

self.last_approval_request = datetime.datetime.utcnow()

687

509

'replace')))

688

510

for attr in

689

511

self.runtime_expansions)

690

512

691

513

try:

692

514

command = self.checker_command % escaped_attrs

693

515

except TypeError as error:

739

561

raise

740

562

self.checker = None

741

563

742

743

564

def dbus_service_property(dbus_interface, signature="v",

744

565

access="readwrite", byte_arrays=False):

745

566

"""Decorators for marking methods of a DBusObjectWithProperties to

791

612

792

613

class DBusObjectWithProperties(dbus.service.Object):

793

614

"""A D-Bus object with properties.

794

615

795

616

Classes inheriting from this can use the dbus_service_property

796

617

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

797

618

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

804

625

def _get_all_dbus_properties(self):

805

626

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

806

627

"""

807

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

808

for cls in self.__class__.__mro__

628

return ((prop._dbus_name, prop)

809

629

for name, prop in

810

inspect.getmembers(cls, self._is_dbus_property))

630

inspect.getmembers(self, self._is_dbus_property))

811

631

812

632

def _get_dbus_property(self, interface_name, property_name):

813

633

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

814

634

property with the specified name and interface.

815

635

"""

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

636

for name in (property_name,

637

property_name + "_dbus_property"):

638

prop = getattr(self, name, None)

639

if (prop is None

640

or not self._is_dbus_property(prop)

641

or prop._dbus_name != property_name

642

or (interface_name and prop._dbus_interface

643

and interface_name != prop._dbus_interface)):

644

continue

645

return prop

823

646

# No such property

824

647

raise DBusPropertyNotFound(self.dbus_object_path + ":"

825

648

+ interface_name + "."

850

673

# signatures other than "ay".

851

674

if prop._dbus_signature != "ay":

852

675

raise ValueError

853

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

854

for byte in value))

676

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

677

for byte in value))

855

678

prop(value)

856

679

857

680

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

859

682

def GetAll(self, interface_name):

860

683

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

861

684

standard.

862

685

863

686

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

864

687

"""

865

properties = {}

688

all = {}

866

689

for name, prop in self._get_all_dbus_properties():

867

690

if (interface_name

868

691

and interface_name != prop._dbus_interface):

873

696

continue

874

697

value = prop()

875

698

if not hasattr(value, "variant_level"):

876

properties[name] = value

699

all[name] = value

877

700

continue

878

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

879

value.variant_level+1)

880

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

701

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

702

value.variant_level+1)

703

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

881

704

882

705

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

883

706

out_signature="s",

934

757

return dbus.String(dt.isoformat(),

935

758

variant_level=variant_level)

936

759

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

760

class ClientDBus(Client, DBusObjectWithProperties):

1037

761

"""A Client class using D-Bus

1038

762

1047

771

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

1048

772

1049

773

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

774

self._approvals_pending = 0

1050

775

self.bus = bus

1051

776

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

1052

777

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

1062

787

def notifychangeproperty(transform_func,

1063

788

dbus_name, type_func=lambda x: x,

1064

789

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

790

""" Modify a variable so that its a property that announce its

791

changes to DBus.

792

transform_fun: Function that takes a value and transform it to

793

DBus type.

794

dbus_name: DBus name of the variable

1071

795

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

796

to DBus

797

variant_level: DBus variant level. default: 1

1074

798

"""

1075

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

799

real_value = [None,]

1076

800

def setter(self, value):

801

old_value = real_value[0]

802

real_value[0] = value

1077

803

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)

804

if type_func(old_value) != type_func(real_value[0]):

805

dbus_value = transform_func(type_func(real_value[0]),

806

variant_level)

1084

807

self.PropertyChanged(dbus.String(dbus_name),

1085

808

dbus_value)

1086

setattr(self, attrname, value)

1087

1088

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

1089

1090

809

810

return property(lambda self: real_value[0], setter)

811

812

1091

813

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1092

814

approvals_pending = notifychangeproperty(dbus.Boolean,

1093

815

"ApprovalPending",

1096

818

last_enabled = notifychangeproperty(datetime_to_dbus,

1097

819

"LastEnabled")

1098

820

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

1099

type_func = lambda checker:

1100

checker is not None)

821

type_func = lambda checker: checker is not None)

1101

822

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1102

823

"LastCheckedOK")

1103

last_approval_request = notifychangeproperty(

1104

datetime_to_dbus, "LastApprovalRequest")

824

last_approval_request = notifychangeproperty(datetime_to_dbus,

825

"LastApprovalRequest")

1105

826

approved_by_default = notifychangeproperty(dbus.Boolean,

1106

827

"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)

828

approval_delay = notifychangeproperty(dbus.UInt16, "ApprovalDelay",

829

type_func = _timedelta_to_milliseconds)

830

approval_duration = notifychangeproperty(dbus.UInt16, "ApprovalDuration",

831

type_func = _timedelta_to_milliseconds)

1114

832

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)

833

timeout = notifychangeproperty(dbus.UInt16, "Timeout",

834

type_func = _timedelta_to_milliseconds)

835

extended_timeout = notifychangeproperty(dbus.UInt16, "ExtendedTimeout",

836

type_func = _timedelta_to_milliseconds)

837

interval = notifychangeproperty(dbus.UInt16, "Interval",

838

type_func = _timedelta_to_milliseconds)

1125

839

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

1126

840

1127

841

del notifychangeproperty

1153

867

1154

868

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

1155

869

*args, **kwargs)

1156

870

1157

871

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

1158

872

old_checker = self.checker

1159

873

if self.checker is not None:

1169

883

return r

1170

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(_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

1287

1001

access="readwrite")

1288

1002

def ApprovalDuration_dbus_property(self, value=None):

1289

1003

if value is None: # get

1290

return dbus.UInt64(timedelta_to_milliseconds(

1004

return dbus.UInt64(_timedelta_to_milliseconds(

1291

1005

self.approval_duration))

1292

1006

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

1293

1007

1307

1021

def Host_dbus_property(self, value=None):

1308

1022

if value is None: # get

1309

1023

return dbus.String(self.host)

1310

self.host = unicode(value)

1024

self.host = value

1311

1025

1312

1026

# Created - property

1313

1027

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

1314

1028

def Created_dbus_property(self):

1315

return datetime_to_dbus(self.created)

1029

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

1316

1030

1317

1031

# LastEnabled - property

1318

1032

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

1356

1070

if value is None: # get

1357

1071

return dbus.UInt64(self.timeout_milliseconds())

1358

1072

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

1073

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

1074

return

1359

1075

# 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

1076

gobject.source_remove(self.disable_initiator_tag)

1077

self.disable_initiator_tag = None

1078

self.expires = None

1079

time_to_die = (self.

1080

_timedelta_to_milliseconds((self

1081

.last_checked_ok

1082

+ self.timeout)

1083

- datetime.datetime

1084

.utcnow()))

1085

if time_to_die <= 0:

1086

# The timeout has passed

1087

self.disable()

1088

else:

1089

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

1090

+ datetime.timedelta(milliseconds = time_to_die))

1091

self.disable_initiator_tag = (gobject.timeout_add

1092

(time_to_die, self.disable))

1093

1379

1094

# ExtendedTimeout - property

1380

1095

@dbus_service_property(_interface, signature="t",

1381

1096

access="readwrite")

1383

1098

if value is None: # get

1384

1099

return dbus.UInt64(self.extended_timeout_milliseconds())

1385

1100

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

1386

1101

1387

1102

# Interval - property

1388

1103

@dbus_service_property(_interface, signature="t",

1389

1104

access="readwrite")

1393

1108

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

1394

1109

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

1395

1110

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

1111

# Reschedule checker run

1112

gobject.source_remove(self.checker_initiator_tag)

1113

self.checker_initiator_tag = (gobject.timeout_add

1114

(value, self.start_checker))

1115

self.start_checker() # Start one now, too

1116

1403

1117

# Checker - property

1404

1118

@dbus_service_property(_interface, signature="s",

1405

1119

access="readwrite")

1406

1120

def Checker_dbus_property(self, value=None):

1407

1121

if value is None: # get

1408

1122

return dbus.String(self.checker_command)

1409

self.checker_command = unicode(value)

1123

self.checker_command = value

1410

1124

1411

1125

# CheckerRunning - property

1412

1126

@dbus_service_property(_interface, signature="b",

1439

1153

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

1440

1154

if not self._pipe.recv():

1441

1155

raise KeyError()

1442

1156

1443

1157

def __getattribute__(self, name):

1444

if name == '_pipe':

1158

if(name == '_pipe'):

1445

1159

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

1446

1160

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

1447

1161

data = self._pipe.recv()

1452

1166

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

1453

1167

return self._pipe.recv()[1]

1454

1168

return func

1455

1169

1456

1170

def __setattr__(self, name, value):

1457

if name == '_pipe':

1171

if(name == '_pipe'):

1458

1172

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

1459

1173

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

1460

1174

1461

1175

1462

class ClientDBusTransitional(ClientDBus):

1463

__metaclass__ = AlternateDBusNamesMetaclass

1464

1465

1466

1176

class ClientHandler(socketserver.BaseRequestHandler, object):

1467

1177

"""A class to handle client connections.

1468

1178

1475

1185

unicode(self.client_address))

1476

1186

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

1477

1187

self.server.child_pipe.fileno())

1478

1188

1479

1189

session = (gnutls.connection

1480

1190

.ClientSession(self.request,

1481

1191

gnutls.connection

1482

1192

.X509Credentials()))

1483

1193

1484

1194

# Note: gnutls.connection.X509Credentials is really a

1485

1195

# generic GnuTLS certificate credentials object so long as

1486

1196

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

1487

1197

# here despite using OpenPGP certificates.

1488

1198

1489

1199

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

1490

1200

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

1491

1201

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

1497

1207

(gnutls.library.functions

1498

1208

.gnutls_priority_set_direct(session._c_object,

1499

1209

priority, None))

1500

1210

1501

1211

# Start communication using the Mandos protocol

1502

1212

# Get protocol number

1503

1213

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

1508

1218

except (ValueError, IndexError, RuntimeError) as error:

1509

1219

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

1510

1220

return

1511

1221

1512

1222

# Start GnuTLS connection

1513

1223

try:

1514

1224

session.handshake()

1518

1228

# established. Just abandon the request.

1519

1229

return

1520

1230

logger.debug("Handshake succeeded")

1521

1231

1522

1232

approval_required = False

1523

1233

try:

1524

1234

try:

1529

1239

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

1530

1240

return

1531

1241

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

1532

1242

1533

1243

try:

1534

1244

client = ProxyClient(child_pipe, fpr,

1535

1245

self.client_address)

1547

1257

client.name)

1548

1258

if self.server.use_dbus:

1549

1259

# Emit D-Bus signal

1550

client.Rejected("Disabled")

1260

client.Rejected("Disabled")

1551

1261

return

1552

1262

1553

if client.approved or not client.approval_delay:

1263

if client._approved or not client.approval_delay:

1554

1264

#We are approved or approval is disabled

1555

1265

break

1556

elif client.approved is None:

1266

elif client._approved is None:

1557

1267

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

1558

1268

client.name)

1559

1269

if self.server.use_dbus:

1570

1280

return

1571

1281

1572

1282

#wait until timeout or approved

1283

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

1573

1284

time = datetime.datetime.now()

1574

1285

client.changedstate.acquire()

1575

(client.changedstate.wait

1576

(float(client.timedelta_to_milliseconds(delay)

1577

/ 1000)))

1286

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

1578

1287

client.changedstate.release()

1579

1288

time2 = datetime.datetime.now()

1580

1289

if (time2 - time) >= delay:

1602

1311

sent, len(client.secret)

1603

1312

- (sent_size + sent))

1604

1313

sent_size += sent

1605

1314

1606

1315

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

1607

# bump the timeout using extended_timeout

1316

# bump the timeout as if seen

1608

1317

client.checked_ok(client.extended_timeout)

1609

1318

if self.server.use_dbus:

1610

1319

# Emit D-Bus signal

1678

1387

# Convert the buffer to a Python bytestring

1679

1388

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

1680

1389

# Convert the bytestring to hexadecimal notation

1681

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

1390

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

1682

1391

return hex_fpr

1683

1392

1684

1393

1687

1396

def sub_process_main(self, request, address):

1688

1397

try:

1689

1398

self.finish_request(request, address)

1690

except Exception:

1399

except:

1691

1400

self.handle_error(request, address)

1692

1401

self.close_request(request)

1693

1402

1694

1403

def process_request(self, request, address):

1695

1404

"""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

1405

multiprocessing.Process(target = self.sub_process_main,

1406

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

1702

1407

1703

1408

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1704

1409

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

1708

1413

This function creates a new pipe in self.pipe

1709

1414

"""

1710

1415

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1711

1712

proc = MultiprocessingMixIn.process_request(self, request,

1713

client_address)

1416

1417

super(MultiprocessingMixInWithPipe,

1418

self).process_request(request, client_address)

1714

1419

self.child_pipe.close()

1715

self.add_pipe(parent_pipe, proc)

1716

1717

def add_pipe(self, parent_pipe, proc):

1420

self.add_pipe(parent_pipe)

1421

1422

def add_pipe(self, parent_pipe):

1718

1423

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

1719

1424

raise NotImplementedError

1720

1425

1721

1722

1426

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1723

1427

socketserver.TCPServer, object):

1724

1428

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

1798

1502

self.enabled = False

1799

1503

self.clients = clients

1800

1504

if self.clients is None:

1801

self.clients = {}

1505

self.clients = set()

1802

1506

self.use_dbus = use_dbus

1803

1507

self.gnutls_priority = gnutls_priority

1804

1508

IPv6_TCPServer.__init__(self, server_address,

1808

1512

def server_activate(self):

1809

1513

if self.enabled:

1810

1514

return socketserver.TCPServer.server_activate(self)

1811

1812

1515

def enable(self):

1813

1516

self.enabled = True

1814

1815

def add_pipe(self, parent_pipe, proc):

1517

def add_pipe(self, parent_pipe):

1816

1518

# Call "handle_ipc" for both data and EOF events

1817

1519

gobject.io_add_watch(parent_pipe.fileno(),

1818

1520

gobject.IO_IN | gobject.IO_HUP,

1819

1521

functools.partial(self.handle_ipc,

1820

parent_pipe =

1821

parent_pipe,

1822

proc = proc))

1823

1522

parent_pipe = parent_pipe))

1523

1824

1524

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

1825

proc = None, client_object=None):

1525

client_object=None):

1826

1526

condition_names = {

1827

1527

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

1828

1528

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

1837

1537

for cond, name in

1838

1538

condition_names.iteritems()

1839

1539

if cond & condition)

1840

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

1540

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

1841

1541

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

1842

# Wait for other process to exit

1843

proc.join()

1844

1542

return False

1845

1543

1846

1544

# Read a request from the child

1851

1549

fpr = request[1]

1852

1550

address = request[2]

1853

1551

1854

for c in self.clients.itervalues():

1552

for c in self.clients:

1855

1553

if c.fingerprint == fpr:

1856

1554

client = c

1857

1555

break

1860

1558

"dress: %s", fpr, address)

1861

1559

if self.use_dbus:

1862

1560

# Emit D-Bus signal

1863

mandos_dbus_service.ClientNotFound(fpr,

1864

address[0])

1561

mandos_dbus_service.ClientNotFound(fpr, address[0])

1865

1562

parent_pipe.send(False)

1866

1563

return False

1867

1564

1868

1565

gobject.io_add_watch(parent_pipe.fileno(),

1869

1566

gobject.IO_IN | gobject.IO_HUP,

1870

1567

functools.partial(self.handle_ipc,

1871

parent_pipe =

1872

parent_pipe,

1873

proc = proc,

1874

client_object =

1875

client))

1568

parent_pipe = parent_pipe,

1569

client_object = client))

1876

1570

parent_pipe.send(True)

1877

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

1878

# same fileno

1571

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

1879

1572

return False

1880

1573

if command == 'funcall':

1881

1574

funcname = request[1]

1882

1575

args = request[2]

1883

1576

kwargs = request[3]

1884

1577

1885

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

1886

funcname)(*args,

1887

**kwargs)))

1888

1578

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

1579

1889

1580

if command == 'getattr':

1890

1581

attrname = request[1]

1891

1582

if callable(client_object.__getattribute__(attrname)):

1892

1583

parent_pipe.send(('function',))

1893

1584

else:

1894

parent_pipe.send(('data', client_object

1895

.__getattribute__(attrname)))

1585

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

1896

1586

1897

1587

if command == 'setattr':

1898

1588

attrname = request[1]

1899

1589

value = request[2]

1900

1590

setattr(client_object, attrname, value)

1901

1591

1902

1592

return True

1903

1593

1904

1594

1941

1631

return timevalue

1942

1632

1943

1633

1634

def if_nametoindex(interface):

1635

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

1636

1637

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

1638

global if_nametoindex

1639

try:

1640

if_nametoindex = (ctypes.cdll.LoadLibrary

1641

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

1642

.if_nametoindex)

1643

except (OSError, AttributeError):

1644

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

1645

def if_nametoindex(interface):

1646

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

1647

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

1648

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

1649

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1650

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

1651

interface))

1652

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

1653

ifreq[16:20])[0]

1654

return interface_index

1655

return if_nametoindex(interface)

1656

1657

1944

1658

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

1945

1659

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

1946

1660

2001

1715

" system bus interface")

2002

1716

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

2003

1717

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

1718

options = parser.parse_args()

2011

1719

2012

1720

if options.check:

2025

1733

"use_dbus": "True",

2026

1734

"use_ipv6": "True",

2027

1735

"debuglevel": "",

2028

"restore": "True",

2029

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

2030

1736

}

2031

1737

2032

1738

# Parse config file for server-global settings

2049

1755

# options, if set.

2050

1756

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

2051

1757

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

2052

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

2053

"statedir"):

1758

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

2054

1759

value = getattr(options, option)

2055

1760

if value is not None:

2056

1761

server_settings[option] = value

2068

1773

debuglevel = server_settings["debuglevel"]

2069

1774

use_dbus = server_settings["use_dbus"]

2070

1775

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

1776

2083

1777

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

2084

1778

syslogger.setFormatter(logging.Formatter

2085

1779

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

2087

1781

% server_settings["servicename"]))

2088

1782

2089

1783

# Parse config file with clients

2090

client_config = configparser.SafeConfigParser(Client

2091

.client_defaults)

1784

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

1785

"extended_timeout": "15m",

1786

"interval": "2m",

1787

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

1788

"host": "",

1789

"approval_delay": "0s",

1790

"approval_duration": "1s",

1791

}

1792

client_config = configparser.SafeConfigParser(client_defaults)

2092

1793

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

2093

1794

"clients.conf"))

2094

1795

2132

1833

if error[0] != errno.EPERM:

2133

1834

raise error

2134

1835

1836

if not debug and not debuglevel:

1837

syslogger.setLevel(logging.WARNING)

1838

console.setLevel(logging.WARNING)

1839

if debuglevel:

1840

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

1841

syslogger.setLevel(level)

1842

console.setLevel(level)

1843

2135

1844

if debug:

2136

1845

# Enable all possible GnuTLS debugging

2137

1846

2151

1860

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

2152

1861

if null > 2:

2153

1862

os.close(null)

1863

else:

1864

# No console logging

1865

logger.removeHandler(console)

2154

1866

2155

1867

# Need to fork before connecting to D-Bus

2156

1868

if not debug:

2157

1869

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

2158

1870

daemon()

2159

1871

2160

gobject.threads_init()

2161

2162

1872

global main_loop

2163

1873

# From the Avahi example code

2164

1874

DBusGMainLoop(set_as_default=True )

2167

1877

# End of Avahi example code

2168

1878

if use_dbus:

2169

1879

try:

2170

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

1880

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

2171

1881

bus, do_not_queue=True)

2172

old_bus_name = (dbus.service.BusName

2173

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

2174

do_not_queue=True))

2175

1882

except dbus.exceptions.NameExistsException as e:

2176

1883

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

2177

1884

use_dbus = False

2178

1885

server_settings["use_dbus"] = False

2179

1886

tcp_server.use_dbus = False

2180

1887

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)

1888

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

1889

servicetype = "_mandos._tcp",

1890

protocol = protocol, bus = bus)

2185

1891

if server_settings["interface"]:

2186

1892

service.interface = (if_nametoindex

2187

1893

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

2191

1897

2192

1898

client_class = Client

2193

1899

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))

1900

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

1901

def client_config_items(config, section):

1902

special_settings = {

1903

"approved_by_default":

1904

lambda: config.getboolean(section,

1905

"approved_by_default"),

1906

}

1907

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

2263

1908

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

1909

yield (name, special_settings[name]())

1910

except KeyError:

1911

yield (name, value)

1912

1913

tcp_server.clients.update(set(

1914

client_class(name = section,

1915

config= dict(client_config_items(

1916

client_config, section)))

1917

for section in client_config.sections()))

2289

1918

if not tcp_server.clients:

2290

1919

logger.warning("No clients defined")

2291

1920

2302

1931

# "pidfile" was never created

2303

1932

pass

2304

1933

del pidfilename

1934

2305

1935

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

2306

1936

2307

1937

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

2308

1938

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

2309

1939

2312

1942

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

2313

1943

def __init__(self):

2314

1944

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

2315

_interface = "se.recompile.Mandos"

1945

_interface = "se.bsnet.fukt.Mandos"

2316

1946

2317

1947

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

2318

1948

def ClientAdded(self, objpath):

2333

1963

def GetAllClients(self):

2334

1964

"D-Bus method"

2335

1965

return dbus.Array(c.dbus_object_path

2336

for c in

2337

tcp_server.clients.itervalues())

1966

for c in tcp_server.clients)

2338

1967

2339

1968

@dbus.service.method(_interface,

2340

1969

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

2342

1971

"D-Bus method"

2343

1972

return dbus.Dictionary(

2344

1973

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

2345

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

1974

for c in tcp_server.clients),

2346

1975

signature="oa{sv}")

2347

1976

2348

1977

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

2349

1978

def RemoveClient(self, object_path):

2350

1979

"D-Bus method"

2351

for c in tcp_server.clients.itervalues():

1980

for c in tcp_server.clients:

2352

1981

if c.dbus_object_path == object_path:

2353

del tcp_server.clients[c.name]

1982

tcp_server.clients.remove(c)

2354

1983

c.remove_from_connection()

2355

1984

# Don't signal anything except ClientRemoved

2356

1985

c.disable(quiet=True)

2361

1990

2362

1991

del _interface

2363

1992

2364

class MandosDBusServiceTransitional(MandosDBusService):

2365

__metaclass__ = AlternateDBusNamesMetaclass

2366

mandos_dbus_service = MandosDBusServiceTransitional()

1993

mandos_dbus_service = MandosDBusService()

2367

1994

2368

1995

def cleanup():

2369

1996

"Cleanup function; run on exit"

2370

1997

service.cleanup()

2371

1998

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

1999

while tcp_server.clients:

2426

name, client = tcp_server.clients.popitem()

2000

client = tcp_server.clients.pop()

2427

2001

if use_dbus:

2428

2002

client.remove_from_connection()

2003

client.disable_hook = None

2429

2004

# Don't signal anything except ClientRemoved

2430

2005

client.disable(quiet=True)

2431

2006

if use_dbus:

2432

2007

# Emit D-Bus signal

2433

mandos_dbus_service.ClientRemoved(client

2434

.dbus_object_path,

2008

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2435

2009

client.name)

2436

client_settings.clear()

2437

2010

2438

2011

atexit.register(cleanup)

2439

2012

2440

for client in tcp_server.clients.itervalues():

2013

for client in tcp_server.clients:

2441

2014

if use_dbus:

2442

2015

# Emit D-Bus signal

2443

2016

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2444

# Need to initiate checking of clients

2445

if client.enabled:

2446

client.init_checker()

2017

client.enable()

2447

2018

2448

2019

tcp_server.enable()

2449

2020

tcp_server.server_activate()