/mandos/release : revision 237.7.27

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

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#

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# Everything else is

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#

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

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

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# along with this program. If not, see

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

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#

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

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

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#

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from __future__ import (division, absolute_import, print_function,

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import functools

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import cPickle as pickle

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import multiprocessing

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import types

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import binascii

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import tempfile

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import dbus

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import dbus.service

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import ctypes.util

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import xml.dom.minidom

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import inspect

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import GnuPGInterface

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try:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.5.3"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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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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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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

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.if_nametoindex)

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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

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

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

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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

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interface))

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

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ifreq[16:20])[0]

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return interface_index

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

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"""init logger and add loglevel"""

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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

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pass

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class PGPEngine(object):

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

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def __init__(self):

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self.gnupg = GnuPGInterface.GnuPG()

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

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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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

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'--quiet',

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'--no-use-agent'])

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def __enter__(self):

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return self

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

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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

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topdown = False):

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for filename in files:

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

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for dirname in dirs:

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

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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

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

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

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def encrypt(self, data, password):

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

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with open(os.devnull) as devnull:

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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ciphertext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return ciphertext

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def decrypt(self, data, password):

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

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with open(os.devnull) as devnull:

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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decrypted_plaintext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return decrypted_plaintext

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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class AvahiError(Exception):

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

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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

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.GetAlternativeServiceName(self.name))

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self.name = unicode(self.server.GetAlternativeServiceName(self.name))

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

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self.name)

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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except dbus.exceptions.DBusException, 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.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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self.group.connect_to_signal('StateChanged',

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self

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.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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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.Free()

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self.group = None

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self.remove()

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

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def server_state_changed(self, state):

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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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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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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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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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follow_name_owner_changes=True),

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avahi.DBUS_PATH_SERVER),

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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_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, -2 means no checker completed yet.

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

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last_enabled: datetime.datetime(); (UTC)

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

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D-Bus identifiers

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

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

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until this client is disabled

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extended_timeout: extra long timeout when secret has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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

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

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"extended_timeout": "15m",

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"interval": "2m",

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

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"host": "",

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"approval_delay": "0s",

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"approval_duration": "1s",

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"approved_by_default": "True",

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"enabled": "True",

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}

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@staticmethod

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def _timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.extended_timeout)

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return self._timedelta_to_milliseconds(self.timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return timedelta_to_milliseconds(self.interval)

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return self._timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

459

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, ...}, ...}

465

with exceptions for any special settings as defined above.

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

467

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")

478

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

479

"enabled")

480

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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:

486

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

487

(section["secfile"])),

488

"rb") as secfile:

489

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

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else:

491

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

492

% section)

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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

497

client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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

502

client["last_approval_request"] = None

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client["last_checked_ok"] = None

504

client["last_checker_status"] = -2

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return settings

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508

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

297

return self._timedelta_to_milliseconds(self.approval_delay)

298

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

510

300

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

511

301

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

512

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attribute."""

513

303

self.name = name

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# adding all client settings

515

for setting, value in settings.iteritems():

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setattr(self, setting, value)

517

518

if self.enabled:

519

if not hasattr(self, "last_enabled"):

520

self.last_enabled = datetime.datetime.utcnow()

521

if not hasattr(self, "expires"):

522

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

523

+ self.timeout)

524

else:

525

self.last_enabled = None

526

self.expires = None

527

304

if config is None:

305

config = {}

528

306

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

529

307

# Uppercase and remove spaces from fingerprint for later

530

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# comparison purposes with return value from the fingerprint()

531

309

# function

310

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

311

.replace(" ", ""))

532

312

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

533

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

534

datetime.datetime.utcnow())

535

536

# attributes specific for this server instance

313

if "secret" in config:

314

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

315

elif "secfile" in config:

316

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

317

(config["secfile"])),

318

"rb") as secfile:

319

self.secret = secfile.read()

320

else:

321

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

322

% 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

328

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

537

332

self.checker = None

538

333

self.checker_initiator_tag = None

539

334

self.disable_initiator_tag = None

540

335

self.checker_callback_tag = None

336

self.checker_command = config["checker"]

541

337

self.current_checker_command = None

542

self.approved = None

338

self.last_connect = None

339

self._approved = None

340

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

341

True)

543

342

self.approvals_pending = 0

544

self.changedstate = (multiprocessing_manager

545

.Condition(multiprocessing_manager

546

.Lock()))

547

self.client_structure = [attr for attr in

548

self.__dict__.iterkeys()

549

if not attr.startswith("_")]

550

self.client_structure.append("client_structure")

551

552

for name, t in inspect.getmembers(type(self),

553

lambda obj:

554

isinstance(obj,

555

property)):

556

if not name.startswith("_"):

557

self.client_structure.append(name)

343

self.approval_delay = string_to_delta(

344

config["approval_delay"])

345

self.approval_duration = string_to_delta(

346

config["approval_duration"])

347

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

558

348

559

# Send notice to process children that client state has changed

560

349

def send_changedstate(self):

561

with self.changedstate:

562

self.changedstate.notify_all()

563

350

self.changedstate.acquire()

351

self.changedstate.notify_all()

352

self.changedstate.release()

353

564

354

def enable(self):

565

355

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

566

356

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

567

357

# Already enabled

568

358

return

569

359

self.send_changedstate()

570

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

571

self.enabled = True

572

360

self.last_enabled = datetime.datetime.utcnow()

573

self.init_checker()

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))

366

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

367

self.disable_initiator_tag = (gobject.timeout_add

368

(self.timeout_milliseconds(),

369

self.disable))

370

self.enabled = True

371

# Also start a new checker *right now*.

372

self.start_checker()

574

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def disable(self, quiet=True):

576

375

"""Disable this client."""

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382

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

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383

gobject.source_remove(self.disable_initiator_tag)

585

384

self.disable_initiator_tag = None

586

self.expires = None

587

385

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

588

386

gobject.source_remove(self.checker_initiator_tag)

589

387

self.checker_initiator_tag = None

590

388

self.stop_checker()

389

if self.disable_hook:

390

self.disable_hook(self)

591

391

self.enabled = False

592

392

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

593

393

return False

594

394

595

395

def __del__(self):

396

self.disable_hook = None

596

397

self.disable()

597

398

598

def init_checker(self):

599

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

600

# and every interval from then on.

601

self.checker_initiator_tag = (gobject.timeout_add

602

(self.interval_milliseconds(),

603

self.start_checker))

604

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

605

self.disable_initiator_tag = (gobject.timeout_add

606

(self.timeout_milliseconds(),

607

self.disable))

608

# Also start a new checker *right now*.

609

self.start_checker()

610

611

399

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

612

400

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

613

401

self.checker_callback_tag = None

614

402

self.checker = None

615

403

if os.WIFEXITED(condition):

616

self.last_checker_status = os.WEXITSTATUS(condition)

617

if self.last_checker_status == 0:

404

exitstatus = os.WEXITSTATUS(condition)

405

if exitstatus == 0:

618

406

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

619

407

vars(self))

620

408

self.checked_ok()

622

410

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

623

411

vars(self))

624

412

else:

625

self.last_checker_status = -1

626

413

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

627

414

vars(self))

628

415

629

416

def checked_ok(self):

630

"""Assert that the client has been seen, alive and well."""

417

"""Bump up the timeout for this client.

418

419

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

420

alive and well.

421

"""

631

422

self.last_checked_ok = datetime.datetime.utcnow()

632

self.last_checker_status = 0

633

self.bump_timeout()

634

635

def bump_timeout(self, timeout=None):

636

"""Bump up the timeout for this client."""

637

if timeout is None:

638

timeout = self.timeout

639

if self.disable_initiator_tag is not None:

640

gobject.source_remove(self.disable_initiator_tag)

641

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

642

self.disable_initiator_tag = (gobject.timeout_add

643

(timedelta_to_milliseconds

644

(timeout), self.disable))

645

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

423

gobject.source_remove(self.disable_initiator_tag)

424

self.disable_initiator_tag = (gobject.timeout_add

425

(self.timeout_milliseconds(),

426

self.disable))

646

427

647

428

def need_approval(self):

648

429

self.last_approval_request = datetime.datetime.utcnow()

664

445

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

665

446

try:

666

447

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

667

except (AttributeError, OSError) as error:

448

except (AttributeError, OSError), error:

668

449

if (isinstance(error, OSError)

669

450

and error.errno != errno.ECHILD):

670

451

raise error

688

469

'replace')))

689

470

for attr in

690

471

self.runtime_expansions)

691

472

692

473

try:

693

474

command = self.checker_command % escaped_attrs

694

except TypeError as error:

475

except TypeError, error:

695

476

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

696

477

' %s', self.checker_command, error)

697

478

return True # Try again later

716

497

if pid:

717

498

gobject.source_remove(self.checker_callback_tag)

718

499

self.checker_callback(pid, status, command)

719

except OSError as error:

500

except OSError, error:

720

501

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

721

502

error)

722

503

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

735

516

#time.sleep(0.5)

736

517

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

737

518

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

738

except OSError as error:

519

except OSError, error:

739

520

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

740

521

raise

741

522

self.checker = None

742

523

743

744

524

def dbus_service_property(dbus_interface, signature="v",

745

525

access="readwrite", byte_arrays=False):

746

526

"""Decorators for marking methods of a DBusObjectWithProperties to

792

572

793

573

class DBusObjectWithProperties(dbus.service.Object):

794

574

"""A D-Bus object with properties.

795

575

796

576

Classes inheriting from this can use the dbus_service_property

797

577

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

798

578

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

805

585

def _get_all_dbus_properties(self):

806

586

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

807

587

"""

808

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

809

for cls in self.__class__.__mro__

588

return ((prop._dbus_name, prop)

810

589

for name, prop in

811

inspect.getmembers(cls, self._is_dbus_property))

590

inspect.getmembers(self, self._is_dbus_property))

812

591

813

592

def _get_dbus_property(self, interface_name, property_name):

814

593

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

815

594

property with the specified name and interface.

816

595

"""

817

for cls in self.__class__.__mro__:

818

for name, value in (inspect.getmembers

819

(cls, self._is_dbus_property)):

820

if (value._dbus_name == property_name

821

and value._dbus_interface == interface_name):

822

return value.__get__(self)

823

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

824

606

# No such property

825

607

raise DBusPropertyNotFound(self.dbus_object_path + ":"

826

608

+ interface_name + "."

851

633

# signatures other than "ay".

852

634

if prop._dbus_signature != "ay":

853

635

raise ValueError

854

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

855

for byte in value))

636

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

637

for byte in value))

856

638

prop(value)

857

639

858

640

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

860

642

def GetAll(self, interface_name):

861

643

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

862

644

standard.

863

645

864

646

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

865

647

"""

866

properties = {}

648

all = {}

867

649

for name, prop in self._get_all_dbus_properties():

868

650

if (interface_name

869

651

and interface_name != prop._dbus_interface):

874

656

continue

875

657

value = prop()

876

658

if not hasattr(value, "variant_level"):

877

properties[name] = value

659

all[name] = value

878

660

continue

879

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

880

value.variant_level+1)

881

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

661

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

662

value.variant_level+1)

663

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

882

664

883

665

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

884

666

out_signature="s",

922

704

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

923

705

document.unlink()

924

706

except (AttributeError, xml.dom.DOMException,

925

xml.parsers.expat.ExpatError) as error:

707

xml.parsers.expat.ExpatError), error:

926

708

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

927

709

error)

928

710

return xmlstring

929

711

930

712

931

def datetime_to_dbus (dt, variant_level=0):

932

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

933

if dt is None:

934

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

935

return dbus.String(dt.isoformat(),

936

variant_level=variant_level)

937

938

939

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

940

.__metaclass__):

941

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

942

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

943

"""

944

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

945

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

946

# methods, signals, or properties in them

947

for base in (b for b in bases

948

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

949

# Go though all attributes of the base class

950

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

951

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

952

# with the wrong interface name

953

if (not hasattr(attribute, "_dbus_interface")

954

or not attribute._dbus_interface

955

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

956

continue

957

# Create an alternate D-Bus interface name based on

958

# the current name

959

alt_interface = (attribute._dbus_interface

960

.replace("se.recompile.Mandos",

961

"se.bsnet.fukt.Mandos"))

962

# Is this a D-Bus signal?

963

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

964

# Extract the original non-method function by

965

# black magic

966

nonmethod_func = (dict(

967

zip(attribute.func_code.co_freevars,

968

attribute.__closure__))["func"]

969

.cell_contents)

970

# Create a new, but exactly alike, function

971

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

972

# with the alternate D-Bus interface name

973

new_function = (dbus.service.signal

974

(alt_interface,

975

attribute._dbus_signature)

976

(types.FunctionType(

977

nonmethod_func.func_code,

978

nonmethod_func.func_globals,

979

nonmethod_func.func_name,

980

nonmethod_func.func_defaults,

981

nonmethod_func.func_closure)))

982

# Define a creator of a function to call both the

983

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

984

# signals gets sent when the function is called

985

def fixscope(func1, func2):

986

"""This function is a scope container to pass

987

func1 and func2 to the "call_both" function

988

outside of its arguments"""

989

def call_both(*args, **kwargs):

990

"""This function will emit two D-Bus

991

signals by calling func1 and func2"""

992

func1(*args, **kwargs)

993

func2(*args, **kwargs)

994

return call_both

995

# Create the "call_both" function and add it to

996

# the class

997

attr[attrname] = fixscope(attribute,

998

new_function)

999

# Is this a D-Bus method?

1000

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

1001

# Create a new, but exactly alike, function

1002

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

1003

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

1004

# to the class.

1005

attr[attrname] = (dbus.service.method

1006

(alt_interface,

1007

attribute._dbus_in_signature,

1008

attribute._dbus_out_signature)

1009

(types.FunctionType

1010

(attribute.func_code,

1011

attribute.func_globals,

1012

attribute.func_name,

1013

attribute.func_defaults,

1014

attribute.func_closure)))

1015

# Is this a D-Bus property?

1016

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

1017

# Create a new, but exactly alike, function

1018

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

1019

# property with the alternate D-Bus interface

1020

# name. Add it to the class.

1021

attr[attrname] = (dbus_service_property

1022

(alt_interface,

1023

attribute._dbus_signature,

1024

attribute._dbus_access,

1025

attribute

1026

._dbus_get_args_options

1027

["byte_arrays"])

1028

(types.FunctionType

1029

(attribute.func_code,

1030

attribute.func_globals,

1031

attribute.func_name,

1032

attribute.func_defaults,

1033

attribute.func_closure)))

1034

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

1035

1036

1037

713

class ClientDBus(Client, DBusObjectWithProperties):

1038

714

"""A Client class using D-Bus

1039

715

1048

724

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

1049

725

1050

726

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

727

self._approvals_pending = 0

1051

728

self.bus = bus

1052

729

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

1053

730

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

1060

737

DBusObjectWithProperties.__init__(self, self.bus,

1061

738

self.dbus_object_path)

1062

739

1063

def notifychangeproperty(transform_func,

1064

dbus_name, type_func=lambda x: x,

1065

variant_level=1):

1066

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

1067

its changes to DBus.

1068

1069

transform_fun: Function that takes a value and a variant_level

1070

and transforms it to a D-Bus type.

1071

dbus_name: D-Bus name of the variable

1072

type_func: Function that transform the value before sending it

1073

to the D-Bus. Default: no transform

1074

variant_level: D-Bus variant level. Default: 1

1075

"""

1076

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

1077

def setter(self, value):

1078

if hasattr(self, "dbus_object_path"):

1079

if (not hasattr(self, attrname) or

1080

type_func(getattr(self, attrname, None))

1081

!= type_func(value)):

1082

dbus_value = transform_func(type_func(value),

1083

variant_level

1084

=variant_level)

1085

self.PropertyChanged(dbus.String(dbus_name),

1086

dbus_value)

1087

setattr(self, attrname, value)

1088

1089

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

1090

1091

1092

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1093

approvals_pending = notifychangeproperty(dbus.Boolean,

1094

"ApprovalPending",

1095

type_func = bool)

1096

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

1097

last_enabled = notifychangeproperty(datetime_to_dbus,

1098

"LastEnabled")

1099

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

1100

type_func = lambda checker:

1101

checker is not None)

1102

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1103

"LastCheckedOK")

1104

last_checker_status = notifychangeproperty(dbus.Int16,

1105

"LastCheckerStatus")

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

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

1131

783

1132

784

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

1133

785

try:

1142

794

*args, **kwargs):

1143

795

self.checker_callback_tag = None

1144

796

self.checker = None

797

# Emit D-Bus signal

798

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

799

dbus.Boolean(False, variant_level=1))

1145

800

if os.WIFEXITED(condition):

1146

801

exitstatus = os.WEXITSTATUS(condition)

1147

802

# Emit D-Bus signal

1157

812

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

1158

813

*args, **kwargs)

1159

814

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

1160

833

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

1161

834

old_checker = self.checker

1162

835

if self.checker is not None:

1169

842

and old_checker_pid != self.checker.pid):

1170

843

# Emit D-Bus signal

1171

844

self.CheckerStarted(self.current_checker_command)

845

self.PropertyChanged(

846

dbus.String("CheckerRunning"),

847

dbus.Boolean(True, variant_level=1))

1172

848

return r

1173

849

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

1174

859

def _reset_approved(self):

1175

self.approved = None

860

self._approved = None

1176

861

return False

1177

862

1178

863

def approve(self, value=True):

1179

864

self.send_changedstate()

1180

self.approved = value

1181

gobject.timeout_add(timedelta_to_milliseconds

865

self._approved = value

866

gobject.timeout_add(self._timedelta_to_milliseconds

1182

867

(self.approval_duration),

1183

868

self._reset_approved)

1184

869

1185

870

1186

871

## D-Bus methods, signals & properties

1187

_interface = "se.recompile.Mandos.Client"

872

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

1188

873

1189

874

## Signals

1190

875

1237

922

# CheckedOK - method

1238

923

@dbus.service.method(_interface)

1239

924

def CheckedOK(self):

1240

self.checked_ok()

925

return self.checked_ok()

1241

926

1242

927

# Enable - method

1243

928

@dbus.service.method(_interface)

1276

961

if value is None: # get

1277

962

return dbus.Boolean(self.approved_by_default)

1278

963

self.approved_by_default = bool(value)

964

# Emit D-Bus signal

965

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

966

dbus.Boolean(value, variant_level=1))

1279

967

1280

968

# ApprovalDelay - property

1281

969

@dbus_service_property(_interface, signature="t",

1284

972

if value is None: # get

1285

973

return dbus.UInt64(self.approval_delay_milliseconds())

1286

974

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))

1287

978

1288

979

# ApprovalDuration - property

1289

980

@dbus_service_property(_interface, signature="t",

1290

981

access="readwrite")

1291

982

def ApprovalDuration_dbus_property(self, value=None):

1292

983

if value is None: # get

1293

return dbus.UInt64(timedelta_to_milliseconds(

984

return dbus.UInt64(self._timedelta_to_milliseconds(

1294

985

self.approval_duration))

1295

986

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))

1296

990

1297

991

# Name - property

1298

992

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

1310

1004

def Host_dbus_property(self, value=None):

1311

1005

if value is None: # get

1312

1006

return dbus.String(self.host)

1313

self.host = unicode(value)

1007

self.host = value

1008

# Emit D-Bus signal

1009

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

1010

dbus.String(value, variant_level=1))

1314

1011

1315

1012

# Created - property

1316

1013

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

1317

1014

def Created_dbus_property(self):

1318

return datetime_to_dbus(self.created)

1015

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

1319

1016

1320

1017

# LastEnabled - property

1321

1018

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

1322

1019

def LastEnabled_dbus_property(self):

1323

return datetime_to_dbus(self.last_enabled)

1020

if self.last_enabled is None:

1021

return dbus.String("")

1022

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

1324

1023

1325

1024

# Enabled - property

1326

1025

@dbus_service_property(_interface, signature="b",

1340

1039

if value is not None:

1341

1040

self.checked_ok()

1342

1041

return

1343

return datetime_to_dbus(self.last_checked_ok)

1344

1345

# LastCheckerStatus - property

1346

@dbus_service_property(_interface, signature="n",

1347

access="read")

1348

def LastCheckerStatus_dbus_property(self):

1349

return dbus.Int16(self.last_checker_status)

1350

1351

# Expires - property

1352

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

1353

def Expires_dbus_property(self):

1354

return datetime_to_dbus(self.expires)

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))

1355

1046

1356

1047

# LastApprovalRequest - property

1357

1048

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

1358

1049

def LastApprovalRequest_dbus_property(self):

1359

return datetime_to_dbus(self.last_approval_request)

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))

1360

1055

1361

1056

# Timeout - property

1362

1057

@dbus_service_property(_interface, signature="t",

1365

1060

if value is None: # get

1366

1061

return dbus.UInt64(self.timeout_milliseconds())

1367

1062

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

1368

1068

# Reschedule timeout

1369

if self.enabled:

1370

now = datetime.datetime.utcnow()

1371

time_to_die = timedelta_to_milliseconds(

1372

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

1373

if time_to_die <= 0:

1374

# The timeout has passed

1375

self.disable()

1376

else:

1377

self.expires = (now +

1378

datetime.timedelta(milliseconds =

1379

time_to_die))

1380

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

1381

is None):

1382

return

1383

gobject.source_remove(self.disable_initiator_tag)

1384

self.disable_initiator_tag = (gobject.timeout_add

1385

(time_to_die,

1386

self.disable))

1387

1388

# ExtendedTimeout - property

1389

@dbus_service_property(_interface, signature="t",

1390

access="readwrite")

1391

def ExtendedTimeout_dbus_property(self, value=None):

1392

if value is None: # get

1393

return dbus.UInt64(self.extended_timeout_milliseconds())

1394

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

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))

1395

1083

1396

1084

# Interval - property

1397

1085

@dbus_service_property(_interface, signature="t",

1400

1088

if value is None: # get

1401

1089

return dbus.UInt64(self.interval_milliseconds())

1402

1090

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))

1403

1094

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

1404

1095

return

1405

if self.enabled:

1406

# Reschedule checker run

1407

gobject.source_remove(self.checker_initiator_tag)

1408

self.checker_initiator_tag = (gobject.timeout_add

1409

(value, self.start_checker))

1410

self.start_checker() # Start one now, too

1411

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

1412

1102

# Checker - property

1413

1103

@dbus_service_property(_interface, signature="s",

1414

1104

access="readwrite")

1415

1105

def Checker_dbus_property(self, value=None):

1416

1106

if value is None: # get

1417

1107

return dbus.String(self.checker_command)

1418

self.checker_command = unicode(value)

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))

1419

1113

1420

1114

# CheckerRunning - property

1421

1115

@dbus_service_property(_interface, signature="b",

1448

1142

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

1449

1143

if not self._pipe.recv():

1450

1144

raise KeyError()

1451

1145

1452

1146

def __getattribute__(self, name):

1453

if name == '_pipe':

1147

if(name == '_pipe'):

1454

1148

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

1455

1149

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

1456

1150

data = self._pipe.recv()

1461

1155

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

1462

1156

return self._pipe.recv()[1]

1463

1157

return func

1464

1158

1465

1159

def __setattr__(self, name, value):

1466

if name == '_pipe':

1160

if(name == '_pipe'):

1467

1161

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

1468

1162

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

1469

1163

1470

1164

1471

class ClientDBusTransitional(ClientDBus):

1472

__metaclass__ = AlternateDBusNamesMetaclass

1473

1474

1475

1165

class ClientHandler(socketserver.BaseRequestHandler, object):

1476

1166

"""A class to handle client connections.

1477

1167

1484

1174

unicode(self.client_address))

1485

1175

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

1486

1176

self.server.child_pipe.fileno())

1487

1177

1488

1178

session = (gnutls.connection

1489

1179

.ClientSession(self.request,

1490

1180

gnutls.connection

1491

1181

.X509Credentials()))

1492

1182

1493

1183

# Note: gnutls.connection.X509Credentials is really a

1494

1184

# generic GnuTLS certificate credentials object so long as

1495

1185

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

1496

1186

# here despite using OpenPGP certificates.

1497

1187

1498

1188

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

1499

1189

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

1500

1190

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

1506

1196

(gnutls.library.functions

1507

1197

.gnutls_priority_set_direct(session._c_object,

1508

1198

priority, None))

1509

1199

1510

1200

# Start communication using the Mandos protocol

1511

1201

# Get protocol number

1512

1202

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

1514

1204

try:

1515

1205

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

1516

1206

raise RuntimeError

1517

except (ValueError, IndexError, RuntimeError) as error:

1207

except (ValueError, IndexError, RuntimeError), error:

1518

1208

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

1519

1209

return

1520

1210

1521

1211

# Start GnuTLS connection

1522

1212

try:

1523

1213

session.handshake()

1524

except gnutls.errors.GNUTLSError as error:

1214

except gnutls.errors.GNUTLSError, error:

1525

1215

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

1526

1216

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

1527

1217

# established. Just abandon the request.

1528

1218

return

1529

1219

logger.debug("Handshake succeeded")

1530

1220

1531

1221

approval_required = False

1532

1222

try:

1533

1223

try:

1534

1224

fpr = self.fingerprint(self.peer_certificate

1535

1225

(session))

1536

except (TypeError,

1537

gnutls.errors.GNUTLSError) as error:

1226

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

1538

1227

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

1539

1228

return

1540

1229

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

1541

1230

1542

1231

try:

1543

1232

client = ProxyClient(child_pipe, fpr,

1544

1233

self.client_address)

1552

1241

1553

1242

while True:

1554

1243

if not client.enabled:

1555

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

1244

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

1556

1245

client.name)

1557

1246

if self.server.use_dbus:

1558

1247

# Emit D-Bus signal

1559

client.Rejected("Disabled")

1248

client.Rejected("Disabled")

1560

1249

return

1561

1250

1562

if client.approved or not client.approval_delay:

1251

if client._approved or not client.approval_delay:

1563

1252

#We are approved or approval is disabled

1564

1253

break

1565

elif client.approved is None:

1254

elif client._approved is None:

1566

1255

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

1567

1256

client.name)

1568

1257

if self.server.use_dbus:

1579

1268

return

1580

1269

1581

1270

#wait until timeout or approved

1271

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

1582

1272

time = datetime.datetime.now()

1583

1273

client.changedstate.acquire()

1584

(client.changedstate.wait

1585

(float(client.timedelta_to_milliseconds(delay)

1586

/ 1000)))

1274

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

1587

1275

client.changedstate.release()

1588

1276

time2 = datetime.datetime.now()

1589

1277

if (time2 - time) >= delay:

1604

1292

while sent_size < len(client.secret):

1605

1293

try:

1606

1294

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

1607

except gnutls.errors.GNUTLSError as error:

1295

except (gnutls.errors.GNUTLSError), error:

1608

1296

logger.warning("gnutls send failed")

1609

1297

return

1610

1298

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

1611

1299

sent, len(client.secret)

1612

1300

- (sent_size + sent))

1613

1301

sent_size += sent

1614

1302

1615

1303

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

1616

# bump the timeout using extended_timeout

1617

client.bump_timeout(client.extended_timeout)

1304

# bump the timeout as if seen

1305

client.checked_ok()

1618

1306

if self.server.use_dbus:

1619

1307

# Emit D-Bus signal

1620

1308

client.GotSecret()

1624

1312

client.approvals_pending -= 1

1625

1313

try:

1626

1314

session.bye()

1627

except gnutls.errors.GNUTLSError as error:

1315

except (gnutls.errors.GNUTLSError), error:

1628

1316

logger.warning("GnuTLS bye failed")

1629

1317

1630

1318

@staticmethod

1687

1375

# Convert the buffer to a Python bytestring

1688

1376

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

1689

1377

# Convert the bytestring to hexadecimal notation

1690

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

1378

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

1691

1379

return hex_fpr

1692

1380

1693

1381

1696

1384

def sub_process_main(self, request, address):

1697

1385

try:

1698

1386

self.finish_request(request, address)

1699

except Exception:

1387

except:

1700

1388

self.handle_error(request, address)

1701

1389

self.close_request(request)

1702

1390

1703

1391

def process_request(self, request, address):

1704

1392

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

1705

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

1706

args = (request,

1707

address))

1708

proc.start()

1709

return proc

1710

1393

multiprocessing.Process(target = self.sub_process_main,

1394

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

1711

1395

1712

1396

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1713

1397

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

1717

1401

This function creates a new pipe in self.pipe

1718

1402

"""

1719

1403

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1720

1721

proc = MultiprocessingMixIn.process_request(self, request,

1722

client_address)

1404

1405

super(MultiprocessingMixInWithPipe,

1406

self).process_request(request, client_address)

1723

1407

self.child_pipe.close()

1724

self.add_pipe(parent_pipe, proc)

1725

1726

def add_pipe(self, parent_pipe, proc):

1408

self.add_pipe(parent_pipe)

1409

1410

def add_pipe(self, parent_pipe):

1727

1411

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

1728

1412

raise NotImplementedError

1729

1413

1730

1731

1414

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1732

1415

socketserver.TCPServer, object):

1733

1416

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

1759

1442

SO_BINDTODEVICE,

1760

1443

str(self.interface

1761

1444

+ '\0'))

1762

except socket.error as error:

1445

except socket.error, error:

1763

1446

if error[0] == errno.EPERM:

1764

1447

logger.error("No permission to"

1765

1448

" bind to interface %s",

1807

1490

self.enabled = False

1808

1491

self.clients = clients

1809

1492

if self.clients is None:

1810

self.clients = {}

1493

self.clients = set()

1811

1494

self.use_dbus = use_dbus

1812

1495

self.gnutls_priority = gnutls_priority

1813

1496

IPv6_TCPServer.__init__(self, server_address,

1817

1500

def server_activate(self):

1818

1501

if self.enabled:

1819

1502

return socketserver.TCPServer.server_activate(self)

1820

1821

1503

def enable(self):

1822

1504

self.enabled = True

1823

1824

def add_pipe(self, parent_pipe, proc):

1505

def add_pipe(self, parent_pipe):

1825

1506

# Call "handle_ipc" for both data and EOF events

1826

1507

gobject.io_add_watch(parent_pipe.fileno(),

1827

1508

gobject.IO_IN | gobject.IO_HUP,

1828

1509

functools.partial(self.handle_ipc,

1829

parent_pipe =

1830

parent_pipe,

1831

proc = proc))

1832

1510

parent_pipe = parent_pipe))

1511

1833

1512

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

1834

proc = None, client_object=None):

1513

client_object=None):

1835

1514

condition_names = {

1836

1515

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

1837

1516

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

1846

1525

for cond, name in

1847

1526

condition_names.iteritems()

1848

1527

if cond & condition)

1849

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

1528

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

1850

1529

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

1851

# Wait for other process to exit

1852

proc.join()

1853

1530

return False

1854

1531

1855

1532

# Read a request from the child

1860

1537

fpr = request[1]

1861

1538

address = request[2]

1862

1539

1863

for c in self.clients.itervalues():

1540

for c in self.clients:

1864

1541

if c.fingerprint == fpr:

1865

1542

client = c

1866

1543

break

1867

1544

else:

1868

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

1869

"dress: %s", fpr, address)

1545

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

1546

"dress: %s", fpr, address)

1870

1547

if self.use_dbus:

1871

1548

# Emit D-Bus signal

1872

mandos_dbus_service.ClientNotFound(fpr,

1873

address[0])

1549

mandos_dbus_service.ClientNotFound(fpr, address[0])

1874

1550

parent_pipe.send(False)

1875

1551

return False

1876

1552

1877

1553

gobject.io_add_watch(parent_pipe.fileno(),

1878

1554

gobject.IO_IN | gobject.IO_HUP,

1879

1555

functools.partial(self.handle_ipc,

1880

parent_pipe =

1881

parent_pipe,

1882

proc = proc,

1883

client_object =

1884

client))

1556

parent_pipe = parent_pipe,

1557

client_object = client))

1885

1558

parent_pipe.send(True)

1886

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

1887

# same fileno

1559

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

1888

1560

return False

1889

1561

if command == 'funcall':

1890

1562

funcname = request[1]

1891

1563

args = request[2]

1892

1564

kwargs = request[3]

1893

1565

1894

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

1895

funcname)(*args,

1896

**kwargs)))

1897

1566

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

1567

1898

1568

if command == 'getattr':

1899

1569

attrname = request[1]

1900

1570

if callable(client_object.__getattribute__(attrname)):

1901

1571

parent_pipe.send(('function',))

1902

1572

else:

1903

parent_pipe.send(('data', client_object

1904

.__getattribute__(attrname)))

1573

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

1905

1574

1906

1575

if command == 'setattr':

1907

1576

attrname = request[1]

1908

1577

value = request[2]

1909

1578

setattr(client_object, attrname, value)

1910

1579

1911

1580

return True

1912

1581

1913

1582

1944

1613

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

1945

1614

else:

1946

1615

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

1947

except (ValueError, IndexError) as e:

1616

except (ValueError, IndexError), e:

1948

1617

raise ValueError(*(e.args))

1949

1618

timevalue += delta

1950

1619

return timevalue

1951

1620

1952

1621

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

1953

1646

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

1954

1647

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

1955

1648

2010

1703

" system bus interface")

2011

1704

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

2012

1705

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

2013

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

2014

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

2015

" state")

2016

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

2017

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

2018

2019

1706

options = parser.parse_args()

2020

1707

2021

1708

if options.check:

2034

1721

"use_dbus": "True",

2035

1722

"use_ipv6": "True",

2036

1723

"debuglevel": "",

2037

"restore": "True",

2038

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

2039

1724

}

2040

1725

2041

1726

# Parse config file for server-global settings

2058

1743

# options, if set.

2059

1744

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

2060

1745

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

2061

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

2062

"statedir"):

1746

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

2063

1747

value = getattr(options, option)

2064

1748

if value is not None:

2065

1749

server_settings[option] = value

2077

1761

debuglevel = server_settings["debuglevel"]

2078

1762

use_dbus = server_settings["use_dbus"]

2079

1763

use_ipv6 = server_settings["use_ipv6"]

2080

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

2081

stored_state_file)

2082

2083

if debug:

2084

initlogger(debug, logging.DEBUG)

2085

else:

2086

if not debuglevel:

2087

initlogger(debug)

2088

else:

2089

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

2090

initlogger(debug, level)

2091

1764

2092

1765

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

2093

1766

syslogger.setFormatter(logging.Formatter

2094

1767

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

2096

1769

% server_settings["servicename"]))

2097

1770

2098

1771

# Parse config file with clients

2099

client_config = configparser.SafeConfigParser(Client

2100

.client_defaults)

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)

2101

1780

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

2102

1781

"clients.conf"))

2103

1782

2137

1816

try:

2138

1817

os.setgid(gid)

2139

1818

os.setuid(uid)

2140

except OSError as error:

1819

except OSError, error:

2141

1820

if error[0] != errno.EPERM:

2142

1821

raise error

2143

1822

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

2144

1831

if debug:

2145

1832

# Enable all possible GnuTLS debugging

2146

1833

2160

1847

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

2161

1848

if null > 2:

2162

1849

os.close(null)

1850

else:

1851

# No console logging

1852

logger.removeHandler(console)

2163

1853

2164

1854

# Need to fork before connecting to D-Bus

2165

1855

if not debug:

2166

1856

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

2167

1857

daemon()

2168

1858

2169

gobject.threads_init()

2170

2171

1859

global main_loop

2172

1860

# From the Avahi example code

2173

1861

DBusGMainLoop(set_as_default=True )

2176

1864

# End of Avahi example code

2177

1865

if use_dbus:

2178

1866

try:

2179

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

1867

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

2180

1868

bus, do_not_queue=True)

2181

old_bus_name = (dbus.service.BusName

2182

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

2183

do_not_queue=True))

2184

except dbus.exceptions.NameExistsException as e:

1869

except dbus.exceptions.NameExistsException, e:

2185

1870

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

2186

1871

use_dbus = False

2187

1872

server_settings["use_dbus"] = False

2188

1873

tcp_server.use_dbus = False

2189

1874

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2190

service = AvahiServiceToSyslog(name =

2191

server_settings["servicename"],

2192

servicetype = "_mandos._tcp",

2193

protocol = protocol, bus = bus)

1875

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

1876

servicetype = "_mandos._tcp",

1877

protocol = protocol, bus = bus)

2194

1878

if server_settings["interface"]:

2195

1879

service.interface = (if_nametoindex

2196

1880

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

2200

1884

2201

1885

client_class = Client

2202

1886

if use_dbus:

2203

client_class = functools.partial(ClientDBusTransitional,

2204

bus = bus)

2205

2206

client_settings = Client.config_parser(client_config)

2207

old_client_settings = {}

2208

clients_data = {}

2209

2210

# Get client data and settings from last running state.

2211

if server_settings["restore"]:

2212

try:

2213

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

2214

clients_data, old_client_settings = (pickle.load

2215

(stored_state))

2216

os.remove(stored_state_path)

2217

except IOError as e:

2218

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

2219

.format(e))

2220

if e.errno != errno.ENOENT:

2221

raise

2222

except EOFError as e:

2223

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

2224

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

2225

2226

with PGPEngine() as pgp:

2227

for client_name, client in clients_data.iteritems():

2228

# Decide which value to use after restoring saved state.

2229

# We have three different values: Old config file,

2230

# new config file, and saved state.

2231

# New config value takes precedence if it differs from old

2232

# config value, otherwise use saved state.

2233

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

2234

try:

2235

# For each value in new config, check if it

2236

# differs from the old config value (Except for

2237

# the "secret" attribute)

2238

if (name != "secret" and

2239

value != old_client_settings[client_name]

2240

[name]):

2241

client[name] = value

2242

except KeyError:

2243

pass

2244

2245

# Clients who has passed its expire date can still be

2246

# enabled if its last checker was successful. Clients

2247

# whose checker succeeded before we stored its state is

2248

# assumed to have successfully run all checkers during

2249

# downtime.

2250

if client["enabled"]:

2251

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

2252

if not client["last_checked_ok"]:

2253

logger.warning(

2254

"disabling client {0} - Client never "

2255

"performed a successful checker"

2256

.format(client_name))

2257

client["enabled"] = False

2258

elif client["last_checker_status"] != 0:

2259

logger.warning(

2260

"disabling client {0} - Client "

2261

"last checker failed with error code {1}"

2262

.format(client_name,

2263

client["last_checker_status"]))

2264

client["enabled"] = False

2265

else:

2266

client["expires"] = (datetime.datetime

2267

.utcnow()

2268

+ client["timeout"])

2269

logger.debug("Last checker succeeded,"

2270

" keeping {0} enabled"

2271

.format(client_name))

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):

2272

1895

try:

2273

client["secret"] = (

2274

pgp.decrypt(client["encrypted_secret"],

2275

client_settings[client_name]

2276

["secret"]))

2277

except PGPError:

2278

# If decryption fails, we use secret from new settings

2279

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

2280

.format(client_name))

2281

client["secret"] = (

2282

client_settings[client_name]["secret"])

2283

2284

2285

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

2286

for client_name in (set(old_client_settings)

2287

- set(client_settings)):

2288

del clients_data[client_name]

2289

for client_name in (set(client_settings)

2290

- set(old_client_settings)):

2291

clients_data[client_name] = client_settings[client_name]

2292

2293

# Create all client objects

2294

for client_name, client in clients_data.iteritems():

2295

tcp_server.clients[client_name] = client_class(

2296

name = client_name, settings = client)

2297

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()))

2298

1905

if not tcp_server.clients:

2299

1906

logger.warning("No clients defined")

2300

1907

2311

1918

# "pidfile" was never created

2312

1919

pass

2313

1920

del pidfilename

1921

2314

1922

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

2315

1923

2316

1924

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

2317

1925

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

2318

1926

2321

1929

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

2322

1930

def __init__(self):

2323

1931

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

2324

_interface = "se.recompile.Mandos"

1932

_interface = "se.bsnet.fukt.Mandos"

2325

1933

2326

1934

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

2327

1935

def ClientAdded(self, objpath):

2342

1950

def GetAllClients(self):

2343

1951

"D-Bus method"

2344

1952

return dbus.Array(c.dbus_object_path

2345

for c in

2346

tcp_server.clients.itervalues())

1953

for c in tcp_server.clients)

2347

1954

2348

1955

@dbus.service.method(_interface,

2349

1956

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

2351

1958

"D-Bus method"

2352

1959

return dbus.Dictionary(

2353

1960

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

2354

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

1961

for c in tcp_server.clients),

2355

1962

signature="oa{sv}")

2356

1963

2357

1964

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

2358

1965

def RemoveClient(self, object_path):

2359

1966

"D-Bus method"

2360

for c in tcp_server.clients.itervalues():

1967

for c in tcp_server.clients:

2361

1968

if c.dbus_object_path == object_path:

2362

del tcp_server.clients[c.name]

1969

tcp_server.clients.remove(c)

2363

1970

c.remove_from_connection()

2364

1971

# Don't signal anything except ClientRemoved

2365

1972

c.disable(quiet=True)

2370

1977

2371

1978

del _interface

2372

1979

2373

class MandosDBusServiceTransitional(MandosDBusService):

2374

__metaclass__ = AlternateDBusNamesMetaclass

2375

mandos_dbus_service = MandosDBusServiceTransitional()

1980

mandos_dbus_service = MandosDBusService()

2376

1981

2377

1982

def cleanup():

2378

1983

"Cleanup function; run on exit"

2379

1984

service.cleanup()

2380

1985

2381

multiprocessing.active_children()

2382

if not (tcp_server.clients or client_settings):

2383

return

2384

2385

# Store client before exiting. Secrets are encrypted with key

2386

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

2387

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

2388

clients = {}

2389

with PGPEngine() as pgp:

2390

for client in tcp_server.clients.itervalues():

2391

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

2392

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

2393

key)

2394

client_dict = {}

2395

2396

# A list of attributes that can not be pickled

2397

# + secret.

2398

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

2399

"checker"))

2400

for name, typ in (inspect.getmembers

2401

(dbus.service.Object)):

2402

exclude.add(name)

2403

2404

client_dict["encrypted_secret"] = (client

2405

.encrypted_secret)

2406

for attr in client.client_structure:

2407

if attr not in exclude:

2408

client_dict[attr] = getattr(client, attr)

2409

2410

clients[client.name] = client_dict

2411

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

2412

2413

try:

2414

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

2415

prefix="clients-",

2416

dir=os.path.dirname

2417

(stored_state_path))

2418

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

2419

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

2420

os.rename(tempname, stored_state_path)

2421

except (IOError, OSError) as e:

2422

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

2423

.format(e))

2424

if not debug:

2425

try:

2426

os.remove(tempname)

2427

except NameError:

2428

pass

2429

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

2430

errno.EEXIST)):

2431

raise e

2432

2433

# Delete all clients, and settings from config

2434

1986

while tcp_server.clients:

2435

name, client = tcp_server.clients.popitem()

1987

client = tcp_server.clients.pop()

2436

1988

if use_dbus:

2437

1989

client.remove_from_connection()

1990

client.disable_hook = None

2438

1991

# Don't signal anything except ClientRemoved

2439

1992

client.disable(quiet=True)

2440

1993

if use_dbus:

2441

1994

# Emit D-Bus signal

2442

mandos_dbus_service.ClientRemoved(client

2443

.dbus_object_path,

1995

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2444

1996

client.name)

2445

client_settings.clear()

2446

1997

2447

1998

atexit.register(cleanup)

2448

1999

2449

for client in tcp_server.clients.itervalues():

2000

for client in tcp_server.clients:

2450

2001

if use_dbus:

2451

2002

# Emit D-Bus signal

2452

2003

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2453

# Need to initiate checking of clients

2454

if client.enabled:

2455

client.init_checker()

2004

client.enable()

2456

2005

2457

2006

tcp_server.enable()

2458

2007

tcp_server.server_activate()

2473

2022

# From the Avahi example code

2474

2023

try:

2475

2024

service.activate()

2476

except dbus.exceptions.DBusException as error:

2025

except dbus.exceptions.DBusException, error:

2477

2026

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

2478

2027

cleanup()

2479

2028

sys.exit(1)

2486

2035

2487

2036

logger.debug("Starting main loop")

2488

2037

main_loop.run()

2489

except AvahiError as error:

2038

except AvahiError, error:

2490

2039

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

2491

2040

cleanup()

2492

2041

sys.exit(1)