/mandos/trunk : revision 549

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

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#

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# Everything else is

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#

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

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

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# along with this program. If not, see

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

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#

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

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

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#

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from __future__ import (division, absolute_import, print_function,

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import functools

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import cPickle as pickle

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import multiprocessing

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import types

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import binascii

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import tempfile

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import dbus

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import dbus.service

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import ctypes.util

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import xml.dom.minidom

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import inspect

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import GnuPGInterface

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try:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.3.0"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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version = "1.5.0"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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

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.if_nametoindex)

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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

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

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

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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

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interface))

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

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ifreq[16:20])[0]

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return interface_index

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def initlogger(debug, level=logging.WARNING):

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"""init logger and add loglevel"""

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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console.setFormatter(logging.Formatter('%(asctime)s %(name)s'

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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"""Exception if encryption/decryption fails"""

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pass

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class PGPEngine(object):

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"""A simple class for OpenPGP symmetric encryption & decryption"""

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def __init__(self):

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self.gnupg = GnuPGInterface.GnuPG()

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self.tempdir = tempfile.mkdtemp(prefix="mandos-")

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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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self.gnupg.options.extra_args.extend(['--force-mdc',

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'--quiet',

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'--no-use-agent'])

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def __enter__(self):

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return self

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def __exit__ (self, exc_type, exc_value, traceback):

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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for root, dirs, files in os.walk(self.tempdir,

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topdown = False):

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for filename in files:

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os.remove(os.path.join(root, filename))

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for dirname in dirs:

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os.rmdir(os.path.join(root, dirname))

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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# Passphrase can not be empty and can not contain newlines or

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# NUL bytes. So we prefix it and hex encode it.

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return b"mandos" + binascii.hexlify(password)

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def encrypt(self, data, password):

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self.gnupg.passphrase = self.password_encode(password)

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with open(os.devnull) as devnull:

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try:

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proc = self.gnupg.run(['--symmetric'],

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create_fhs=['stdin', 'stdout'],

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attach_fhs={'stderr': devnull})

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with contextlib.closing(proc.handles['stdin']) as f:

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f.write(data)

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with contextlib.closing(proc.handles['stdout']) as f:

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ciphertext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return ciphertext

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def decrypt(self, data, password):

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self.gnupg.passphrase = self.password_encode(password)

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with open(os.devnull) as devnull:

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try:

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proc = self.gnupg.run(['--decrypt'],

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create_fhs=['stdin', 'stdout'],

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attach_fhs={'stderr': devnull})

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with contextlib.closing(proc.handles['stdin'] ) as f:

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f.write(data)

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with contextlib.closing(proc.handles['stdout']) as f:

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decrypted_plaintext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return decrypted_plaintext

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class AvahiError(Exception):

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def __init__(self, value, *args, **kwargs):

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self.group = None # our entry group

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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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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except dbus.exceptions.DBusException, error:

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except dbus.exceptions.DBusException as error:

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logger.critical("DBusException: %s", error)

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match.remove()

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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if self.group is None:

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self.group = dbus.Interface(

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self.bus.get_object(avahi.DBUS_NAME,

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self.server.EntryGroupNew()),

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.group.connect_to_signal('StateChanged',

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self

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.entry_group_state_changed)

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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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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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def cleanup(self):

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

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if self.group is not None:

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self.group.Free()

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException):

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pass

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self.group = None

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def server_state_changed(self, state):

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self.remove()

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def server_state_changed(self, state, error=None):

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

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logger.debug("Avahi server state change: %i", state)

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if state == avahi.SERVER_COLLISION:

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logger.error("Zeroconf server name collision")

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self.remove()

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bad_states = { avahi.SERVER_INVALID:

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"Zeroconf server invalid",

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avahi.SERVER_REGISTERING: None,

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avahi.SERVER_COLLISION:

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"Zeroconf server name collision",

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avahi.SERVER_FAILURE:

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"Zeroconf server failure" }

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if state in bad_states:

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if bad_states[state] is not None:

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if error is None:

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logger.error(bad_states[state])

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else:

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

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self.cleanup()

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elif state == avahi.SERVER_RUNNING:

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self.add()

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else:

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if error is None:

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

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else:

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

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def activate(self):

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

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if self.server is None:

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self.server = dbus.Interface(

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self.bus.get_object(avahi.DBUS_NAME,

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avahi.DBUS_PATH_SERVER),

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avahi.DBUS_PATH_SERVER,

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follow_name_owner_changes=True),

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avahi.DBUS_INTERFACE_SERVER)

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self.server.connect_to_signal("StateChanged",

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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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"""

469

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

476

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()

482

.replace(" ", ""))

483

if "secret" in section:

484

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

485

elif "secfile" in section:

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

487

(section["secfile"])),

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"rb") as secfile:

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

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else:

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

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% section)

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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

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

301

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

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attribute."""

303

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self.name = name

304

if config is None:

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config = {}

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# adding all client settings

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for setting, value in settings.iteritems():

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setattr(self, setting, value)

517

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if self.enabled:

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if not hasattr(self, "last_enabled"):

520

self.last_enabled = datetime.datetime.utcnow()

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if not hasattr(self, "expires"):

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

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+ self.timeout)

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else:

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self.last_enabled = None

526

self.expires = None

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

309

531

# function

310

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

311

.replace(" ", ""))

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532

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

313

if "secret" in config:

314

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

315

elif "secfile" in config:

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

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(config["secfile"])),

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"rb") as secfile:

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self.secret = secfile.read()

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else:

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

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% self.name)

323

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

324

self.created = datetime.datetime.utcnow()

325

self.enabled = False

326

self.last_approval_request = None

327

self.last_enabled = None

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self.last_checked_ok = None

329

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

330

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

331

self.disable_hook = disable_hook

533

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

534

datetime.datetime.utcnow())

535

536

# attributes specific for this server instance

332

537

self.checker = None

333

538

self.checker_initiator_tag = None

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539

self.disable_initiator_tag = None

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540

self.checker_callback_tag = None

336

self.checker_command = config["checker"]

337

541

self.current_checker_command = None

338

self.last_connect = None

339

self._approved = None

340

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

341

True)

542

self.approved = None

342

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self.approvals_pending = 0

343

self.approval_delay = string_to_delta(

344

config["approval_delay"])

345

self.approval_duration = string_to_delta(

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config["approval_duration"])

347

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)

348

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559

# Send notice to process children that client state has changed

349

560

def send_changedstate(self):

350

self.changedstate.acquire()

351

self.changedstate.notify_all()

352

self.changedstate.release()

353

561

with self.changedstate:

562

self.changedstate.notify_all()

563

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564

def enable(self):

355

565

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

356

566

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

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# Already enabled

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568

return

359

569

self.send_changedstate()

570

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

571

self.enabled = True

360

572

self.last_enabled = datetime.datetime.utcnow()

361

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

362

# and every interval from then on.

363

self.checker_initiator_tag = (gobject.timeout_add

364

(self.interval_milliseconds(),

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self.start_checker))

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

367

self.disable_initiator_tag = (gobject.timeout_add

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(self.timeout_milliseconds(),

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self.disable))

370

self.enabled = True

371

# Also start a new checker *right now*.

372

self.start_checker()

573

self.init_checker()

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def disable(self, quiet=True):

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"""Disable this client."""

382

583

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

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584

gobject.source_remove(self.disable_initiator_tag)

384

585

self.disable_initiator_tag = None

586

self.expires = None

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

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gobject.source_remove(self.checker_initiator_tag)

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589

self.checker_initiator_tag = None

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590

self.stop_checker()

389

if self.disable_hook:

390

self.disable_hook(self)

391

591

self.enabled = False

392

592

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

393

593

return False

394

594

395

595

def __del__(self):

396

self.disable_hook = None

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596

self.disable()

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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))

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

605

self.disable_initiator_tag = (gobject.timeout_add

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(self.timeout_milliseconds(),

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self.disable))

608

# Also start a new checker *right now*.

609

self.start_checker()

610

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

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612

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

401

613

self.checker_callback_tag = None

402

614

self.checker = None

403

615

if os.WIFEXITED(condition):

404

exitstatus = os.WEXITSTATUS(condition)

405

if exitstatus == 0:

616

self.last_checker_status = os.WEXITSTATUS(condition)

617

if self.last_checker_status == 0:

406

618

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

407

619

vars(self))

408

620

self.checked_ok()

410

622

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

411

623

vars(self))

412

624

else:

625

self.last_checker_status = -1

413

626

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

414

627

vars(self))

415

628

416

def checked_ok(self):

629

def checked_ok(self, timeout=None):

417

630

"""Bump up the timeout for this client.

418

631

419

632

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

420

633

alive and well.

421

634

"""

635

if timeout is None:

636

timeout = self.timeout

422

637

self.last_checked_ok = datetime.datetime.utcnow()

423

gobject.source_remove(self.disable_initiator_tag)

424

self.disable_initiator_tag = (gobject.timeout_add

425

(self.timeout_milliseconds(),

426

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

427

645

428

646

def need_approval(self):

429

647

self.last_approval_request = datetime.datetime.utcnow()

445

663

# If a checker exists, make sure it is not a zombie

446

664

try:

447

665

pid, status = os.waitpid(self.checker.pid, os.WNOHANG)

448

except (AttributeError, OSError), error:

666

except (AttributeError, OSError) as error:

449

667

if (isinstance(error, OSError)

450

668

and error.errno != errno.ECHILD):

451

669

raise error

469

687

'replace')))

470

688

for attr in

471

689

self.runtime_expansions)

472

690

473

691

try:

474

692

command = self.checker_command % escaped_attrs

475

except TypeError, error:

693

except TypeError as error:

476

694

logger.error('Could not format string "%s":'

477

695

' %s', self.checker_command, error)

478

696

return True # Try again later

497

715

if pid:

498

716

gobject.source_remove(self.checker_callback_tag)

499

717

self.checker_callback(pid, status, command)

500

except OSError, error:

718

except OSError as error:

501

719

logger.error("Failed to start subprocess: %s",

502

720

error)

503

721

# Re-run this periodically if run by gobject.timeout_add

516

734

#time.sleep(0.5)

517

735

#if self.checker.poll() is None:

518

736

# os.kill(self.checker.pid, signal.SIGKILL)

519

except OSError, error:

737

except OSError as error:

520

738

if error.errno != errno.ESRCH: # No such process

521

739

raise

522

740

self.checker = None

523

741

742

524

743

def dbus_service_property(dbus_interface, signature="v",

525

744

access="readwrite", byte_arrays=False):

526

745

"""Decorators for marking methods of a DBusObjectWithProperties to

572

791

573

792

class DBusObjectWithProperties(dbus.service.Object):

574

793

"""A D-Bus object with properties.

575

794

576

795

Classes inheriting from this can use the dbus_service_property

577

796

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

578

797

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

585

804

def _get_all_dbus_properties(self):

586

805

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

587

806

"""

588

return ((prop._dbus_name, prop)

807

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

808

for cls in self.__class__.__mro__

589

809

for name, prop in

590

inspect.getmembers(self, self._is_dbus_property))

810

inspect.getmembers(cls, self._is_dbus_property))

591

811

592

812

def _get_dbus_property(self, interface_name, property_name):

593

813

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

594

814

property with the specified name and interface.

595

815

"""

596

for name in (property_name,

597

property_name + "_dbus_property"):

598

prop = getattr(self, name, None)

599

if (prop is None

600

or not self._is_dbus_property(prop)

601

or prop._dbus_name != property_name

602

or (interface_name and prop._dbus_interface

603

and interface_name != prop._dbus_interface)):

604

continue

605

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

606

823

# No such property

607

824

raise DBusPropertyNotFound(self.dbus_object_path + ":"

608

825

+ interface_name + "."

633

850

# signatures other than "ay".

634

851

if prop._dbus_signature != "ay":

635

852

raise ValueError

636

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

637

for byte in value))

853

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

854

for byte in value))

638

855

prop(value)

639

856

640

857

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

642

859

def GetAll(self, interface_name):

643

860

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

644

861

standard.

645

862

646

863

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

647

864

"""

648

all = {}

865

properties = {}

649

866

for name, prop in self._get_all_dbus_properties():

650

867

if (interface_name

651

868

and interface_name != prop._dbus_interface):

656

873

continue

657

874

value = prop()

658

875

if not hasattr(value, "variant_level"):

659

all[name] = value

876

properties[name] = value

660

877

continue

661

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

662

value.variant_level+1)

663

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")

664

881

665

882

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

666

883

out_signature="s",

704

921

xmlstring = document.toxml("utf-8")

705

922

document.unlink()

706

923

except (AttributeError, xml.dom.DOMException,

707

xml.parsers.expat.ExpatError), error:

924

xml.parsers.expat.ExpatError) as error:

708

925

logger.error("Failed to override Introspection method",

709

926

error)

710

927

return xmlstring

711

928

712

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

713

1036

class ClientDBus(Client, DBusObjectWithProperties):

714

1037

"""A Client class using D-Bus

715

1038

724

1047

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

725

1048

726

1049

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

727

self._approvals_pending = 0

728

1050

self.bus = bus

729

1051

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

1052

self._approvals_pending = 0

1053

1054

self._approvals_pending = 0

730

1055

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

731

1056

# the D-Bus

732

1057

client_object_name = unicode(self.name).translate(

737

1062

DBusObjectWithProperties.__init__(self, self.bus,

738

1063

self.dbus_object_path)

739

1064

740

def _get_approvals_pending(self):

741

return self._approvals_pending

742

def _set_approvals_pending(self, value):

743

old_value = self._approvals_pending

744

self._approvals_pending = value

745

bval = bool(value)

746

if (hasattr(self, "dbus_object_path")

747

and bval is not bool(old_value)):

748

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

749

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

750

dbus_bool)

751

752

approvals_pending = property(_get_approvals_pending,

753

_set_approvals_pending)

754

del _get_approvals_pending, _set_approvals_pending

755

756

@staticmethod

757

def _datetime_to_dbus(dt, variant_level=0):

758

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

759

return dbus.String(dt.isoformat(),

760

variant_level=variant_level)

761

762

def enable(self):

763

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

764

r = Client.enable(self)

765

if oldstate != self.enabled:

766

# Emit D-Bus signals

767

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

768

dbus.Boolean(True, variant_level=1))

769

self.PropertyChanged(

770

dbus.String("LastEnabled"),

771

self._datetime_to_dbus(self.last_enabled,

772

variant_level=1))

773

return r

774

775

def disable(self, quiet = False):

776

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

777

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

778

if not quiet and oldstate != self.enabled:

779

# Emit D-Bus signal

780

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

781

dbus.Boolean(False, variant_level=1))

782

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

783

1131

784

1132

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

785

1133

try:

794

1142

*args, **kwargs):

795

1143

self.checker_callback_tag = None

796

1144

self.checker = None

797

# Emit D-Bus signal

798

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

799

dbus.Boolean(False, variant_level=1))

800

1145

if os.WIFEXITED(condition):

801

1146

exitstatus = os.WEXITSTATUS(condition)

802

1147

# Emit D-Bus signal

812

1157

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

813

1158

*args, **kwargs)

814

1159

815

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

816

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

817

# Emit D-Bus signal

818

self.PropertyChanged(

819

dbus.String("LastCheckedOK"),

820

(self._datetime_to_dbus(self.last_checked_ok,

821

variant_level=1)))

822

return r

823

824

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

825

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

826

# Emit D-Bus signal

827

self.PropertyChanged(

828

dbus.String("LastApprovalRequest"),

829

(self._datetime_to_dbus(self.last_approval_request,

830

variant_level=1)))

831

return r

832

833

1160

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

834

1161

old_checker = self.checker

835

1162

if self.checker is not None:

842

1169

and old_checker_pid != self.checker.pid):

843

1170

# Emit D-Bus signal

844

1171

self.CheckerStarted(self.current_checker_command)

845

self.PropertyChanged(

846

dbus.String("CheckerRunning"),

847

dbus.Boolean(True, variant_level=1))

848

1172

return r

849

1173

850

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

851

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

852

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

853

if (old_checker is not None

854

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

855

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

856

dbus.Boolean(False, variant_level=1))

857

return r

858

859

1174

def _reset_approved(self):

860

self._approved = None

1175

self.approved = None

861

1176

return False

862

1177

863

1178

def approve(self, value=True):

864

1179

self.send_changedstate()

865

self._approved = value

866

gobject.timeout_add(self._timedelta_to_milliseconds

1180

self.approved = value

1181

gobject.timeout_add(timedelta_to_milliseconds

867

1182

(self.approval_duration),

868

1183

self._reset_approved)

869

1184

870

1185

871

1186

## D-Bus methods, signals & properties

872

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

1187

_interface = "se.recompile.Mandos.Client"

873

1188

874

1189

## Signals

875

1190

912

1227

"D-Bus signal"

913

1228

return self.need_approval()

914

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

915

1238

## Methods

916

1239

917

1240

# Approve - method

922

1245

# CheckedOK - method

923

1246

@dbus.service.method(_interface)

924

1247

def CheckedOK(self):

925

return self.checked_ok()

1248

self.checked_ok()

926

1249

927

1250

# Enable - method

928

1251

@dbus.service.method(_interface)

961

1284

if value is None: # get

962

1285

return dbus.Boolean(self.approved_by_default)

963

1286

self.approved_by_default = bool(value)

964

# Emit D-Bus signal

965

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

966

dbus.Boolean(value, variant_level=1))

967

1287

968

1288

# ApprovalDelay - property

969

1289

@dbus_service_property(_interface, signature="t",

972

1292

if value is None: # get

973

1293

return dbus.UInt64(self.approval_delay_milliseconds())

974

1294

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

975

# Emit D-Bus signal

976

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

977

dbus.UInt64(value, variant_level=1))

978

1295

979

1296

# ApprovalDuration - property

980

1297

@dbus_service_property(_interface, signature="t",

981

1298

access="readwrite")

982

1299

def ApprovalDuration_dbus_property(self, value=None):

983

1300

if value is None: # get

984

return dbus.UInt64(self._timedelta_to_milliseconds(

1301

return dbus.UInt64(timedelta_to_milliseconds(

985

1302

self.approval_duration))

986

1303

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

987

# Emit D-Bus signal

988

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

989

dbus.UInt64(value, variant_level=1))

990

1304

991

1305

# Name - property

992

1306

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

1004

1318

def Host_dbus_property(self, value=None):

1005

1319

if value is None: # get

1006

1320

return dbus.String(self.host)

1007

self.host = value

1008

# Emit D-Bus signal

1009

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

1010

dbus.String(value, variant_level=1))

1321

self.host = unicode(value)

1011

1322

1012

1323

# Created - property

1013

1324

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

1014

1325

def Created_dbus_property(self):

1015

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

1326

return datetime_to_dbus(self.created)

1016

1327

1017

1328

# LastEnabled - property

1018

1329

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

1019

1330

def LastEnabled_dbus_property(self):

1020

if self.last_enabled is None:

1021

return dbus.String("")

1022

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

1331

return datetime_to_dbus(self.last_enabled)

1023

1332

1024

1333

# Enabled - property

1025

1334

@dbus_service_property(_interface, signature="b",

1039

1348

if value is not None:

1040

1349

self.checked_ok()

1041

1350

return

1042

if self.last_checked_ok is None:

1043

return dbus.String("")

1044

return dbus.String(self._datetime_to_dbus(self

1045

.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)

1046

1357

1047

1358

# LastApprovalRequest - property

1048

1359

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

1049

1360

def LastApprovalRequest_dbus_property(self):

1050

if self.last_approval_request is None:

1051

return dbus.String("")

1052

return dbus.String(self.

1053

_datetime_to_dbus(self

1054

.last_approval_request))

1361

return datetime_to_dbus(self.last_approval_request)

1055

1362

1056

1363

# Timeout - property

1057

1364

@dbus_service_property(_interface, signature="t",

1060

1367

if value is None: # get

1061

1368

return dbus.UInt64(self.timeout_milliseconds())

1062

1369

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

1063

# Emit D-Bus signal

1064

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

1065

dbus.UInt64(value, variant_level=1))

1066

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

1067

return

1068

1370

# Reschedule timeout

1069

gobject.source_remove(self.disable_initiator_tag)

1070

self.disable_initiator_tag = None

1071

time_to_die = (self.

1072

_timedelta_to_milliseconds((self

1073

.last_checked_ok

1074

+ self.timeout)

1075

- datetime.datetime

1076

.utcnow()))

1077

if time_to_die <= 0:

1078

# The timeout has passed

1079

self.disable()

1080

else:

1081

self.disable_initiator_tag = (gobject.timeout_add

1082

(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)

1083

1397

1084

1398

# Interval - property

1085

1399

@dbus_service_property(_interface, signature="t",

1088

1402

if value is None: # get

1089

1403

return dbus.UInt64(self.interval_milliseconds())

1090

1404

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

1091

# Emit D-Bus signal

1092

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

1093

dbus.UInt64(value, variant_level=1))

1094

1405

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

1095

1406

return

1096

# Reschedule checker run

1097

gobject.source_remove(self.checker_initiator_tag)

1098

self.checker_initiator_tag = (gobject.timeout_add

1099

(value, self.start_checker))

1100

self.start_checker() # Start one now, too

1101

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

1102

1414

# Checker - property

1103

1415

@dbus_service_property(_interface, signature="s",

1104

1416

access="readwrite")

1105

1417

def Checker_dbus_property(self, value=None):

1106

1418

if value is None: # get

1107

1419

return dbus.String(self.checker_command)

1108

self.checker_command = value

1109

# Emit D-Bus signal

1110

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

1111

dbus.String(self.checker_command,

1112

variant_level=1))

1420

self.checker_command = unicode(value)

1113

1421

1114

1422

# CheckerRunning - property

1115

1423

@dbus_service_property(_interface, signature="b",

1142

1450

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

1143

1451

if not self._pipe.recv():

1144

1452

raise KeyError()

1145

1453

1146

1454

def __getattribute__(self, name):

1147

if(name == '_pipe'):

1455

if name == '_pipe':

1148

1456

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

1149

1457

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

1150

1458

data = self._pipe.recv()

1155

1463

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

1156

1464

return self._pipe.recv()[1]

1157

1465

return func

1158

1466

1159

1467

def __setattr__(self, name, value):

1160

if(name == '_pipe'):

1468

if name == '_pipe':

1161

1469

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

1162

1470

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

1163

1471

1164

1472

1473

class ClientDBusTransitional(ClientDBus):

1474

__metaclass__ = AlternateDBusNamesMetaclass

1475

1476

1165

1477

class ClientHandler(socketserver.BaseRequestHandler, object):

1166

1478

"""A class to handle client connections.

1167

1479

1174

1486

unicode(self.client_address))

1175

1487

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

1176

1488

self.server.child_pipe.fileno())

1177

1489

1178

1490

session = (gnutls.connection

1179

1491

.ClientSession(self.request,

1180

1492

gnutls.connection

1181

1493

.X509Credentials()))

1182

1494

1183

1495

# Note: gnutls.connection.X509Credentials is really a

1184

1496

# generic GnuTLS certificate credentials object so long as

1185

1497

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

1186

1498

# here despite using OpenPGP certificates.

1187

1499

1188

1500

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

1189

1501

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

1190

1502

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

1196

1508

(gnutls.library.functions

1197

1509

.gnutls_priority_set_direct(session._c_object,

1198

1510

priority, None))

1199

1511

1200

1512

# Start communication using the Mandos protocol

1201

1513

# Get protocol number

1202

1514

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

1204

1516

try:

1205

1517

if int(line.strip().split()[0]) > 1:

1206

1518

raise RuntimeError

1207

except (ValueError, IndexError, RuntimeError), error:

1519

except (ValueError, IndexError, RuntimeError) as error:

1208

1520

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

1209

1521

return

1210

1522

1211

1523

# Start GnuTLS connection

1212

1524

try:

1213

1525

session.handshake()

1214

except gnutls.errors.GNUTLSError, error:

1526

except gnutls.errors.GNUTLSError as error:

1215

1527

logger.warning("Handshake failed: %s", error)

1216

1528

# Do not run session.bye() here: the session is not

1217

1529

# established. Just abandon the request.

1218

1530

return

1219

1531

logger.debug("Handshake succeeded")

1220

1532

1221

1533

approval_required = False

1222

1534

try:

1223

1535

try:

1224

1536

fpr = self.fingerprint(self.peer_certificate

1225

1537

(session))

1226

except (TypeError, gnutls.errors.GNUTLSError), error:

1538

except (TypeError,

1539

gnutls.errors.GNUTLSError) as error:

1227

1540

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

1228

1541

return

1229

1542

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

1230

1543

1231

1544

try:

1232

1545

client = ProxyClient(child_pipe, fpr,

1233

1546

self.client_address)

1234

1547

except KeyError:

1235

1548

return

1236

1549

1550

if self.server.use_dbus:

1551

# Emit D-Bus signal

1552

client.NewRequest(str(self.client_address))

1553

1237

1554

if client.approval_delay:

1238

1555

delay = client.approval_delay

1239

1556

client.approvals_pending += 1

1241

1558

1242

1559

while True:

1243

1560

if not client.enabled:

1244

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

1561

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

1245

1562

client.name)

1246

1563

if self.server.use_dbus:

1247

1564

# Emit D-Bus signal

1248

client.Rejected("Disabled")

1565

client.Rejected("Disabled")

1249

1566

return

1250

1567

1251

if client._approved or not client.approval_delay:

1568

if client.approved or not client.approval_delay:

1252

1569

#We are approved or approval is disabled

1253

1570

break

1254

elif client._approved is None:

1571

elif client.approved is None:

1255

1572

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

1256

1573

client.name)

1257

1574

if self.server.use_dbus:

1268

1585

return

1269

1586

1270

1587

#wait until timeout or approved

1271

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

1272

1588

time = datetime.datetime.now()

1273

1589

client.changedstate.acquire()

1274

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

1590

(client.changedstate.wait

1591

(float(client.timedelta_to_milliseconds(delay)

1592

/ 1000)))

1275

1593

client.changedstate.release()

1276

1594

time2 = datetime.datetime.now()

1277

1595

if (time2 - time) >= delay:

1292

1610

while sent_size < len(client.secret):

1293

1611

try:

1294

1612

sent = session.send(client.secret[sent_size:])

1295

except (gnutls.errors.GNUTLSError), error:

1613

except gnutls.errors.GNUTLSError as error:

1296

1614

logger.warning("gnutls send failed")

1297

1615

return

1298

1616

logger.debug("Sent: %d, remaining: %d",

1299

1617

sent, len(client.secret)

1300

1618

- (sent_size + sent))

1301

1619

sent_size += sent

1302

1620

1303

1621

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

1304

# bump the timeout as if seen

1305

client.checked_ok()

1622

# bump the timeout using extended_timeout

1623

client.checked_ok(client.extended_timeout)

1306

1624

if self.server.use_dbus:

1307

1625

# Emit D-Bus signal

1308

1626

client.GotSecret()

1312

1630

client.approvals_pending -= 1

1313

1631

try:

1314

1632

session.bye()

1315

except (gnutls.errors.GNUTLSError), error:

1633

except gnutls.errors.GNUTLSError as error:

1316

1634

logger.warning("GnuTLS bye failed")

1317

1635

1318

1636

@staticmethod

1375

1693

# Convert the buffer to a Python bytestring

1376

1694

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

1377

1695

# Convert the bytestring to hexadecimal notation

1378

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

1696

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

1379

1697

return hex_fpr

1380

1698

1381

1699

1384

1702

def sub_process_main(self, request, address):

1385

1703

try:

1386

1704

self.finish_request(request, address)

1387

except:

1705

except Exception:

1388

1706

self.handle_error(request, address)

1389

1707

self.close_request(request)

1390

1708

1391

1709

def process_request(self, request, address):

1392

1710

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

1393

multiprocessing.Process(target = self.sub_process_main,

1394

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

1395

1717

1396

1718

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1397

1719

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

1401

1723

This function creates a new pipe in self.pipe

1402

1724

"""

1403

1725

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1404

1405

super(MultiprocessingMixInWithPipe,

1406

self).process_request(request, client_address)

1726

1727

proc = MultiprocessingMixIn.process_request(self, request,

1728

client_address)

1407

1729

self.child_pipe.close()

1408

self.add_pipe(parent_pipe)

1409

1410

def add_pipe(self, parent_pipe):

1730

self.add_pipe(parent_pipe, proc)

1731

1732

def add_pipe(self, parent_pipe, proc):

1411

1733

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

1412

1734

raise NotImplementedError

1413

1735

1736

1414

1737

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1415

1738

socketserver.TCPServer, object):

1416

1739

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

1442

1765

SO_BINDTODEVICE,

1443

1766

str(self.interface

1444

1767

+ '\0'))

1445

except socket.error, error:

1768

except socket.error as error:

1446

1769

if error[0] == errno.EPERM:

1447

1770

logger.error("No permission to"

1448

1771

" bind to interface %s",

1490

1813

self.enabled = False

1491

1814

self.clients = clients

1492

1815

if self.clients is None:

1493

self.clients = set()

1816

self.clients = {}

1494

1817

self.use_dbus = use_dbus

1495

1818

self.gnutls_priority = gnutls_priority

1496

1819

IPv6_TCPServer.__init__(self, server_address,

1500

1823

def server_activate(self):

1501

1824

if self.enabled:

1502

1825

return socketserver.TCPServer.server_activate(self)

1826

1503

1827

def enable(self):

1504

1828

self.enabled = True

1505

def add_pipe(self, parent_pipe):

1829

1830

def add_pipe(self, parent_pipe, proc):

1506

1831

# Call "handle_ipc" for both data and EOF events

1507

1832

gobject.io_add_watch(parent_pipe.fileno(),

1508

1833

gobject.IO_IN | gobject.IO_HUP,

1509

1834

functools.partial(self.handle_ipc,

1510

parent_pipe = parent_pipe))

1511

1835

parent_pipe =

1836

parent_pipe,

1837

proc = proc))

1838

1512

1839

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

1513

client_object=None):

1840

proc = None, client_object=None):

1514

1841

condition_names = {

1515

1842

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

1516

1843

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

1525

1852

for cond, name in

1526

1853

condition_names.iteritems()

1527

1854

if cond & condition)

1528

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

1855

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

1529

1856

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

1857

# Wait for other process to exit

1858

proc.join()

1530

1859

return False

1531

1860

1532

1861

# Read a request from the child

1537

1866

fpr = request[1]

1538

1867

address = request[2]

1539

1868

1540

for c in self.clients:

1869

for c in self.clients.itervalues():

1541

1870

if c.fingerprint == fpr:

1542

1871

client = c

1543

1872

break

1544

1873

else:

1545

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

1546

"dress: %s", fpr, address)

1874

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

1875

"dress: %s", fpr, address)

1547

1876

if self.use_dbus:

1548

1877

# Emit D-Bus signal

1549

mandos_dbus_service.ClientNotFound(fpr, address[0])

1878

mandos_dbus_service.ClientNotFound(fpr,

1879

address[0])

1550

1880

parent_pipe.send(False)

1551

1881

return False

1552

1882

1553

1883

gobject.io_add_watch(parent_pipe.fileno(),

1554

1884

gobject.IO_IN | gobject.IO_HUP,

1555

1885

functools.partial(self.handle_ipc,

1556

parent_pipe = parent_pipe,

1557

client_object = client))

1886

parent_pipe =

1887

parent_pipe,

1888

proc = proc,

1889

client_object =

1890

client))

1558

1891

parent_pipe.send(True)

1559

# 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

1560

1894

return False

1561

1895

if command == 'funcall':

1562

1896

funcname = request[1]

1563

1897

args = request[2]

1564

1898

kwargs = request[3]

1565

1899

1566

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

1567

1900

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

1901

funcname)(*args,

1902

**kwargs)))

1903

1568

1904

if command == 'getattr':

1569

1905

attrname = request[1]

1570

1906

if callable(client_object.__getattribute__(attrname)):

1571

1907

parent_pipe.send(('function',))

1572

1908

else:

1573

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

1909

parent_pipe.send(('data', client_object

1910

.__getattribute__(attrname)))

1574

1911

1575

1912

if command == 'setattr':

1576

1913

attrname = request[1]

1577

1914

value = request[2]

1578

1915

setattr(client_object, attrname, value)

1579

1916

1580

1917

return True

1581

1918

1582

1919

1613

1950

delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)

1614

1951

else:

1615

1952

raise ValueError("Unknown suffix %r" % suffix)

1616

except (ValueError, IndexError), e:

1953

except (ValueError, IndexError) as e:

1617

1954

raise ValueError(*(e.args))

1618

1955

timevalue += delta

1619

1956

return timevalue

1620

1957

1621

1958

1622

def if_nametoindex(interface):

1623

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

1624

1625

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

1626

global if_nametoindex

1627

try:

1628

if_nametoindex = (ctypes.cdll.LoadLibrary

1629

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

1630

.if_nametoindex)

1631

except (OSError, AttributeError):

1632

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

1633

def if_nametoindex(interface):

1634

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

1635

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

1636

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

1637

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1638

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

1639

interface))

1640

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

1641

ifreq[16:20])[0]

1642

return interface_index

1643

return if_nametoindex(interface)

1644

1645

1646

1959

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

1647

1960

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

1648

1961

1703

2016

" system bus interface")

1704

2017

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

1705

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

1706

2025

options = parser.parse_args()

1707

2026

1708

2027

if options.check:

1721

2040

"use_dbus": "True",

1722

2041

"use_ipv6": "True",

1723

2042

"debuglevel": "",

2043

"restore": "True",

2044

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

1724

2045

}

1725

2046

1726

2047

# Parse config file for server-global settings

1743

2064

# options, if set.

1744

2065

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

1745

2066

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

1746

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

2067

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

2068

"statedir"):

1747

2069

value = getattr(options, option)

1748

2070

if value is not None:

1749

2071

server_settings[option] = value

1761

2083

debuglevel = server_settings["debuglevel"]

1762

2084

use_dbus = server_settings["use_dbus"]

1763

2085

use_ipv6 = server_settings["use_ipv6"]

1764

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

1765

2098

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

1766

2099

syslogger.setFormatter(logging.Formatter

1767

2100

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

1769

2102

% server_settings["servicename"]))

1770

2103

1771

2104

# Parse config file with clients

1772

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

1773

"interval": "5m",

1774

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

1775

"host": "",

1776

"approval_delay": "0s",

1777

"approval_duration": "1s",

1778

}

1779

client_config = configparser.SafeConfigParser(client_defaults)

2105

client_config = configparser.SafeConfigParser(Client

2106

.client_defaults)

1780

2107

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

1781

2108

"clients.conf"))

1782

2109

1816

2143

try:

1817

2144

os.setgid(gid)

1818

2145

os.setuid(uid)

1819

except OSError, error:

2146

except OSError as error:

1820

2147

if error[0] != errno.EPERM:

1821

2148

raise error

1822

2149

1823

if not debug and not debuglevel:

1824

syslogger.setLevel(logging.WARNING)

1825

console.setLevel(logging.WARNING)

1826

if debuglevel:

1827

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

1828

syslogger.setLevel(level)

1829

console.setLevel(level)

1830

1831

2150

if debug:

1832

2151

# Enable all possible GnuTLS debugging

1833

2152

1847

2166

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

1848

2167

if null > 2:

1849

2168

os.close(null)

1850

else:

1851

# No console logging

1852

logger.removeHandler(console)

1853

2169

1854

2170

# Need to fork before connecting to D-Bus

1855

2171

if not debug:

1856

2172

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

1857

2173

daemon()

1858

2174

2175

gobject.threads_init()

2176

1859

2177

global main_loop

1860

2178

# From the Avahi example code

1861

2179

DBusGMainLoop(set_as_default=True )

1864

2182

# End of Avahi example code

1865

2183

if use_dbus:

1866

2184

try:

1867

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

2185

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

1868

2186

bus, do_not_queue=True)

1869

except dbus.exceptions.NameExistsException, e:

2187

old_bus_name = (dbus.service.BusName

2188

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

2189

do_not_queue=True))

2190

except dbus.exceptions.NameExistsException as e:

1870

2191

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

1871

2192

use_dbus = False

1872

2193

server_settings["use_dbus"] = False

1873

2194

tcp_server.use_dbus = False

1874

2195

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

1875

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

1876

servicetype = "_mandos._tcp",

1877

protocol = protocol, bus = bus)

2196

service = AvahiServiceToSyslog(name =

2197

server_settings["servicename"],

2198

servicetype = "_mandos._tcp",

2199

protocol = protocol, bus = bus)

1878

2200

if server_settings["interface"]:

1879

2201

service.interface = (if_nametoindex

1880

2202

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

1884

2206

1885

2207

client_class = Client

1886

2208

if use_dbus:

1887

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

1888

def client_config_items(config, section):

1889

special_settings = {

1890

"approved_by_default":

1891

lambda: config.getboolean(section,

1892

"approved_by_default"),

1893

}

1894

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"]))

1895

2277

try:

1896

yield (name, special_settings[name]())

1897

except KeyError:

1898

yield (name, value)

1899

1900

tcp_server.clients.update(set(

1901

client_class(name = section,

1902

config= dict(client_config_items(

1903

client_config, section)))

1904

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

1905

2303

if not tcp_server.clients:

1906

2304

logger.warning("No clients defined")

1907

2305

1918

2316

# "pidfile" was never created

1919

2317

pass

1920

2318

del pidfilename

1921

1922

2319

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

1923

2320

1924

2321

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

1925

2322

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

1926

2323

1929

2326

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

1930

2327

def __init__(self):

1931

2328

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

1932

_interface = "se.bsnet.fukt.Mandos"

2329

_interface = "se.recompile.Mandos"

1933

2330

1934

2331

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

1935

2332

def ClientAdded(self, objpath):

1950

2347

def GetAllClients(self):

1951

2348

"D-Bus method"

1952

2349

return dbus.Array(c.dbus_object_path

1953

for c in tcp_server.clients)

2350

for c in

2351

tcp_server.clients.itervalues())

1954

2352

1955

2353

@dbus.service.method(_interface,

1956

2354

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

1958

2356

"D-Bus method"

1959

2357

return dbus.Dictionary(

1960

2358

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

1961

for c in tcp_server.clients),

2359

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

1962

2360

signature="oa{sv}")

1963

2361

1964

2362

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

1965

2363

def RemoveClient(self, object_path):

1966

2364

"D-Bus method"

1967

for c in tcp_server.clients:

2365

for c in tcp_server.clients.itervalues():

1968

2366

if c.dbus_object_path == object_path:

1969

tcp_server.clients.remove(c)

2367

del tcp_server.clients[c.name]

1970

2368

c.remove_from_connection()

1971

2369

# Don't signal anything except ClientRemoved

1972

2370

c.disable(quiet=True)

1977

2375

1978

2376

del _interface

1979

2377

1980

mandos_dbus_service = MandosDBusService()

2378

class MandosDBusServiceTransitional(MandosDBusService):

2379

__metaclass__ = AlternateDBusNamesMetaclass

2380

mandos_dbus_service = MandosDBusServiceTransitional()

1981

2381

1982

2382

def cleanup():

1983

2383

"Cleanup function; run on exit"

1984

2384

service.cleanup()

1985

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

1986

2439

while tcp_server.clients:

1987

client = tcp_server.clients.pop()

2440

name, client = tcp_server.clients.popitem()

1988

2441

if use_dbus:

1989

2442

client.remove_from_connection()

1990

client.disable_hook = None

1991

2443

# Don't signal anything except ClientRemoved

1992

2444

client.disable(quiet=True)

1993

2445

if use_dbus:

1994

2446

# Emit D-Bus signal

1995

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2447

mandos_dbus_service.ClientRemoved(client

2448

.dbus_object_path,

1996

2449

client.name)

2450

client_settings.clear()

1997

2451

1998

2452

atexit.register(cleanup)

1999

2453

2000

for client in tcp_server.clients:

2454

for client in tcp_server.clients.itervalues():

2001

2455

if use_dbus:

2002

2456

# Emit D-Bus signal

2003

2457

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2004

client.enable()

2458

# Need to initiate checking of clients

2459

if client.enabled:

2460

client.init_checker()

2005

2461

2006

2462

tcp_server.enable()

2007

2463

tcp_server.server_activate()

2022

2478

# From the Avahi example code

2023

2479

try:

2024

2480

service.activate()

2025

except dbus.exceptions.DBusException, error:

2481

except dbus.exceptions.DBusException as error:

2026

2482

logger.critical("DBusException: %s", error)

2027

2483

cleanup()

2028

2484

sys.exit(1)

2035

2491

2036

2492

logger.debug("Starting main loop")

2037

2493

main_loop.run()

2038

except AvahiError, error:

2494

except AvahiError as error:

2039

2495

logger.critical("AvahiError: %s", error)

2040

2496

cleanup()

2041

2497

sys.exit(1)