/mandos/release : revision 237.7.163

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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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unicode_literals)

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from future_builtins import *

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import SocketServer as socketserver

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import socket

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import argparse

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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 itertools

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import collections

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import dbus

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import dbus.service

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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 = "1.6.0"

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

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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--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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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir=self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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proc = subprocess.Popen(['gpg', '--symmetric',

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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ciphertext, err = proc.communicate(input = data)

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if proc.returncode != 0:

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raise PGPError(err)

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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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proc = subprocess.Popen(['gpg', '--decrypt',

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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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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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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type: string; Example: '_mandos._tcp'.

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See <http://www.dns-sd.org/ServiceTypes.html>

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See <https://www.iana.org/assignments/service-names-port-numbers>

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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domain: string; Domain to publish on, default to .local if empty.

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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def __init__(self, interface = avahi.IF_UNSPEC, name = None,

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servicetype = None, port = None, TXT = None,

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domain = "", host = "", max_renames = 32768,

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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 as error:

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

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logger.critical("D-Bus Exception", exc_info=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 = 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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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.entry_group_state_changed_match = (

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self.group.connect_to_signal(

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'StateChanged', self .entry_group_state_changed))

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'StateChanged', self.entry_group_state_changed))

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logger.debug("Adding Zeroconf service '%s' of type '%s' ...",

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self.name, self.type)

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self.group.AddService(

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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elif state == avahi.ENTRY_GROUP_FAILURE:

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logger.critical("Avahi: Error in group state changed %s",

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unicode(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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raise AvahiGroupError("State changed: {0!s}"

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.format(error))

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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) as e:

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dbus.exceptions.DBusException):

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pass

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self.group = None

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self.remove()

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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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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_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 ({0}) [%(process)d]:'

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

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.format(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, -2 means no checker completed yet.

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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 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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"created", "enabled", "expires",

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"fingerprint", "host", "interval",

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"last_approval_request", "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": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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

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

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attribute."""

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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.

483

"""

484

settings = {}

485

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

491

client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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

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"enabled")

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

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.replace(" ", ""))

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if "secret" in section:

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

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elif "secfile" in section:

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

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(section["secfile"])),

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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 {0}"

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.format(section))

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

509

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

519

client["last_checker_status"] = -2

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return settings

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

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self.name = name

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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)

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if self.enabled:

530

if not hasattr(self, "last_enabled"):

531

self.last_enabled = datetime.datetime.utcnow()

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if not hasattr(self, "expires"):

533

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

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+ self.timeout)

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else:

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self.last_enabled = None

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self.expires = None

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

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540

# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

336

542

# function

337

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

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.replace(" ", ""))

339

543

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

340

if "secret" in config:

341

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

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elif "secfile" in config:

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

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(config["secfile"])),

345

"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)

350

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

351

self.created = datetime.datetime.utcnow()

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self.enabled = False

353

self.last_approval_request = None

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self.last_enabled = None

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self.last_checked_ok = None

356

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

357

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

358

self.disable_hook = disable_hook

544

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

545

datetime.datetime.utcnow())

546

547

# attributes specific for this server instance

359

548

self.checker = None

360

549

self.checker_initiator_tag = None

361

550

self.disable_initiator_tag = None

362

551

self.checker_callback_tag = None

363

self.checker_command = config["checker"]

364

552

self.current_checker_command = None

365

self.last_connect = None

366

self._approved = None

367

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

368

True)

553

self.approved = None

369

554

self.approvals_pending = 0

370

self.approval_delay = string_to_delta(

371

config["approval_delay"])

372

self.approval_duration = string_to_delta(

373

config["approval_duration"])

374

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

555

self.changedstate = (multiprocessing_manager

556

.Condition(multiprocessing_manager

557

.Lock()))

558

self.client_structure = [attr for attr in

559

self.__dict__.iterkeys()

560

if not attr.startswith("_")]

561

self.client_structure.append("client_structure")

562

563

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

564

lambda obj:

565

isinstance(obj,

566

property)):

567

if not name.startswith("_"):

568

self.client_structure.append(name)

375

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570

# Send notice to process children that client state has changed

376

571

def send_changedstate(self):

377

self.changedstate.acquire()

378

self.changedstate.notify_all()

379

self.changedstate.release()

380

572

with self.changedstate:

573

self.changedstate.notify_all()

574

381

575

def enable(self):

382

576

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

383

577

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

384

578

# Already enabled

385

579

return

386

self.send_changedstate()

580

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

581

self.enabled = True

387

582

self.last_enabled = datetime.datetime.utcnow()

583

self.init_checker()

584

self.send_changedstate()

585

586

def disable(self, quiet=True):

587

"""Disable this client."""

588

if not getattr(self, "enabled", False):

589

return False

590

if not quiet:

591

logger.info("Disabling client %s", self.name)

592

if getattr(self, "disable_initiator_tag", None) is not None:

593

gobject.source_remove(self.disable_initiator_tag)

594

self.disable_initiator_tag = None

595

self.expires = None

596

if getattr(self, "checker_initiator_tag", None) is not None:

597

gobject.source_remove(self.checker_initiator_tag)

598

self.checker_initiator_tag = None

599

self.stop_checker()

600

self.enabled = False

601

if not quiet:

602

self.send_changedstate()

603

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

604

return False

605

606

def __del__(self):

607

self.disable()

608

609

def init_checker(self):

388

610

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

389

611

# and every interval from then on.

612

if self.checker_initiator_tag is not None:

613

gobject.source_remove(self.checker_initiator_tag)

390

614

self.checker_initiator_tag = (gobject.timeout_add

391

615

(self.interval_milliseconds(),

392

616

self.start_checker))

393

617

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

618

if self.disable_initiator_tag is not None:

619

gobject.source_remove(self.disable_initiator_tag)

394

620

self.disable_initiator_tag = (gobject.timeout_add

395

621

(self.timeout_milliseconds(),

396

622

self.disable))

397

self.enabled = True

398

623

# Also start a new checker *right now*.

399

624

self.start_checker()

400

625

401

def disable(self, quiet=True):

402

"""Disable this client."""

403

if not getattr(self, "enabled", False):

404

return False

405

if not quiet:

406

self.send_changedstate()

407

if not quiet:

408

logger.info("Disabling client %s", self.name)

409

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

410

gobject.source_remove(self.disable_initiator_tag)

411

self.disable_initiator_tag = None

412

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

413

gobject.source_remove(self.checker_initiator_tag)

414

self.checker_initiator_tag = None

415

self.stop_checker()

416

if self.disable_hook:

417

self.disable_hook(self)

418

self.enabled = False

419

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

420

return False

421

422

def __del__(self):

423

self.disable_hook = None

424

self.disable()

425

426

626

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

427

627

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

428

628

self.checker_callback_tag = None

429

629

self.checker = None

430

630

if os.WIFEXITED(condition):

431

exitstatus = os.WEXITSTATUS(condition)

432

if exitstatus == 0:

631

self.last_checker_status = os.WEXITSTATUS(condition)

632

if self.last_checker_status == 0:

433

633

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

434

634

vars(self))

435

635

self.checked_ok()

437

637

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

438

638

vars(self))

439

639

else:

640

self.last_checker_status = -1

440

641

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

441

642

vars(self))

442

643

443

644

def checked_ok(self):

444

"""Bump up the timeout for this client.

445

446

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

447

alive and well.

448

"""

645

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

449

646

self.last_checked_ok = datetime.datetime.utcnow()

450

gobject.source_remove(self.disable_initiator_tag)

451

self.disable_initiator_tag = (gobject.timeout_add

452

(self.timeout_milliseconds(),

453

self.disable))

647

self.last_checker_status = 0

648

self.bump_timeout()

649

650

def bump_timeout(self, timeout=None):

651

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

652

if timeout is None:

653

timeout = self.timeout

654

if self.disable_initiator_tag is not None:

655

gobject.source_remove(self.disable_initiator_tag)

656

self.disable_initiator_tag = None

657

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

658

self.disable_initiator_tag = (gobject.timeout_add

659

(timedelta_to_milliseconds

660

(timeout), self.disable))

661

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

454

662

455

663

def need_approval(self):

456

664

self.last_approval_request = datetime.datetime.utcnow()

461

669

If a checker already exists, leave it running and do

462

670

nothing."""

463

671

# The reason for not killing a running checker is that if we

464

# did that, then if a checker (for some reason) started

465

# running slowly and taking more than 'interval' time, the

466

# client would inevitably timeout, since no checker would get

467

# a chance to run to completion. If we instead leave running

672

# did that, and if a checker (for some reason) started running

673

# slowly and taking more than 'interval' time, then the client

674

# would inevitably timeout, since no checker would get a

675

# chance to run to completion. If we instead leave running

468

676

# checkers alone, the checker would have to take more time

469

677

# than 'timeout' for the client to be disabled, which is as it

470

678

# should be.

484

692

self.current_checker_command)

485

693

# Start a new checker if needed

486

694

if self.checker is None:

695

# Escape attributes for the shell

696

escaped_attrs = dict(

697

(attr, re.escape(unicode(getattr(self, attr))))

698

for attr in

699

self.runtime_expansions)

487

700

try:

488

# In case checker_command has exactly one % operator

489

command = self.checker_command % self.host

490

except TypeError:

491

# Escape attributes for the shell

492

escaped_attrs = dict(

493

(attr,

494

re.escape(unicode(str(getattr(self, attr, "")),

495

errors=

496

'replace')))

497

for attr in

498

self.runtime_expansions)

499

500

try:

501

command = self.checker_command % escaped_attrs

502

except TypeError as error:

503

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

504

' %s', self.checker_command, error)

505

return True # Try again later

701

command = self.checker_command % escaped_attrs

702

except TypeError as error:

703

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

704

self.checker_command, exc_info=error)

705

return True # Try again later

506

706

self.current_checker_command = command

507

707

try:

508

708

logger.info("Starting checker %r for %s",

514

714

self.checker = subprocess.Popen(command,

515

715

close_fds=True,

516

716

shell=True, cwd="/")

517

self.checker_callback_tag = (gobject.child_watch_add

518

(self.checker.pid,

519

self.checker_callback,

520

data=command))

521

# The checker may have completed before the gobject

522

# watch was added. Check for this.

717

except OSError as error:

718

logger.error("Failed to start subprocess",

719

exc_info=error)

720

return True

721

self.checker_callback_tag = (gobject.child_watch_add

722

(self.checker.pid,

723

self.checker_callback,

724

data=command))

725

# The checker may have completed before the gobject

726

# watch was added. Check for this.

727

try:

523

728

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

524

if pid:

525

gobject.source_remove(self.checker_callback_tag)

526

self.checker_callback(pid, status, command)

527

729

except OSError as error:

528

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

529

error)

730

if error.errno == errno.ECHILD:

731

# This should never happen

732

logger.error("Child process vanished",

733

exc_info=error)

734

return True

735

raise

736

if pid:

737

gobject.source_remove(self.checker_callback_tag)

738

self.checker_callback(pid, status, command)

530

739

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

531

740

return True

532

741

539

748

return

540

749

logger.debug("Stopping checker for %(name)s", vars(self))

541

750

try:

542

os.kill(self.checker.pid, signal.SIGTERM)

751

self.checker.terminate()

543

752

#time.sleep(0.5)

544

753

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

545

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

754

# self.checker.kill()

546

755

except OSError as error:

547

756

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

548

757

raise

549

758

self.checker = None

550

759

760

551

761

def dbus_service_property(dbus_interface, signature="v",

552

762

access="readwrite", byte_arrays=False):

553

763

"""Decorators for marking methods of a DBusObjectWithProperties to

564

774

# "Set" method, so we fail early here:

565

775

if byte_arrays and signature != "ay":

566

776

raise ValueError("Byte arrays not supported for non-'ay'"

567

" signature %r" % signature)

777

" signature {0!r}".format(signature))

568

778

def decorator(func):

569

779

func._dbus_is_property = True

570

780

func._dbus_interface = dbus_interface

578

788

return decorator

579

789

580

790

791

def dbus_interface_annotations(dbus_interface):

792

"""Decorator for marking functions returning interface annotations

793

794

Usage:

795

796

@dbus_interface_annotations("org.example.Interface")

797

def _foo(self): # Function name does not matter

798

return {"org.freedesktop.DBus.Deprecated": "true",

799

"org.freedesktop.DBus.Property.EmitsChangedSignal":

800

"false"}

801

"""

802

def decorator(func):

803

func._dbus_is_interface = True

804

func._dbus_interface = dbus_interface

805

func._dbus_name = dbus_interface

806

return func

807

return decorator

808

809

810

def dbus_annotations(annotations):

811

"""Decorator to annotate D-Bus methods, signals or properties

812

Usage:

813

814

@dbus_service_property("org.example.Interface", signature="b",

815

access="r")

816

@dbus_annotations({{"org.freedesktop.DBus.Deprecated": "true",

817

"org.freedesktop.DBus.Property."

818

"EmitsChangedSignal": "false"})

819

def Property_dbus_property(self):

820

return dbus.Boolean(False)

821

"""

822

def decorator(func):

823

func._dbus_annotations = annotations

824

return func

825

return decorator

826

827

581

828

class DBusPropertyException(dbus.exceptions.DBusException):

582

829

"""A base class for D-Bus property-related exceptions

583

830

"""

599

846

600

847

class DBusObjectWithProperties(dbus.service.Object):

601

848

"""A D-Bus object with properties.

602

849

603

850

Classes inheriting from this can use the dbus_service_property

604

851

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

605

852

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

606

853

"""

607

854

608

855

@staticmethod

609

def _is_dbus_property(obj):

610

return getattr(obj, "_dbus_is_property", False)

856

def _is_dbus_thing(thing):

857

"""Returns a function testing if an attribute is a D-Bus thing

858

859

If called like _is_dbus_thing("method") it returns a function

860

suitable for use as predicate to inspect.getmembers().

861

"""

862

return lambda obj: getattr(obj, "_dbus_is_{0}".format(thing),

863

False)

611

864

612

def _get_all_dbus_properties(self):

865

def _get_all_dbus_things(self, thing):

613

866

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

614

867

"""

615

return ((prop._dbus_name, prop)

616

for name, prop in

617

inspect.getmembers(self, self._is_dbus_property))

868

return ((getattr(athing.__get__(self), "_dbus_name",

869

name),

870

athing.__get__(self))

871

for cls in self.__class__.__mro__

872

for name, athing in

873

inspect.getmembers(cls,

874

self._is_dbus_thing(thing)))

618

875

619

876

def _get_dbus_property(self, interface_name, property_name):

620

877

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

621

878

property with the specified name and interface.

622

879

"""

623

for name in (property_name,

624

property_name + "_dbus_property"):

625

prop = getattr(self, name, None)

626

if (prop is None

627

or not self._is_dbus_property(prop)

628

or prop._dbus_name != property_name

629

or (interface_name and prop._dbus_interface

630

and interface_name != prop._dbus_interface)):

631

continue

632

return prop

880

for cls in self.__class__.__mro__:

881

for name, value in (inspect.getmembers

882

(cls,

883

self._is_dbus_thing("property"))):

884

if (value._dbus_name == property_name

885

and value._dbus_interface == interface_name):

886

return value.__get__(self)

887

633

888

# No such property

634

889

raise DBusPropertyNotFound(self.dbus_object_path + ":"

635

890

+ interface_name + "."

660

915

# signatures other than "ay".

661

916

if prop._dbus_signature != "ay":

662

917

raise ValueError

663

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

664

for byte in value))

918

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

919

for byte in value))

665

920

prop(value)

666

921

667

922

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

669

924

def GetAll(self, interface_name):

670

925

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

671

926

standard.

672

927

673

928

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

674

929

"""

675

all = {}

676

for name, prop in self._get_all_dbus_properties():

930

properties = {}

931

for name, prop in self._get_all_dbus_things("property"):

677

932

if (interface_name

678

933

and interface_name != prop._dbus_interface):

679

934

# Interface non-empty but did not match

683

938

continue

684

939

value = prop()

685

940

if not hasattr(value, "variant_level"):

686

all[name] = value

941

properties[name] = value

687

942

continue

688

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

689

value.variant_level+1)

690

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

943

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

944

value.variant_level+1)

945

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

691

946

692

947

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

693

948

out_signature="s",

694

949

path_keyword='object_path',

695

950

connection_keyword='connection')

696

951

def Introspect(self, object_path, connection):

697

"""Standard D-Bus method, overloaded to insert property tags.

952

"""Overloading of standard D-Bus method.

953

954

Inserts property tags and interface annotation tags.

698

955

"""

699

956

xmlstring = dbus.service.Object.Introspect(self, object_path,

700

957

connection)

707

964

e.setAttribute("access", prop._dbus_access)

708

965

return e

709

966

for if_tag in document.getElementsByTagName("interface"):

967

# Add property tags

710

968

for tag in (make_tag(document, name, prop)

711

969

for name, prop

712

in self._get_all_dbus_properties()

970

in self._get_all_dbus_things("property")

713

971

if prop._dbus_interface

714

972

== if_tag.getAttribute("name")):

715

973

if_tag.appendChild(tag)

974

# Add annotation tags

975

for typ in ("method", "signal", "property"):

976

for tag in if_tag.getElementsByTagName(typ):

977

annots = dict()

978

for name, prop in (self.

979

_get_all_dbus_things(typ)):

980

if (name == tag.getAttribute("name")

981

and prop._dbus_interface

982

== if_tag.getAttribute("name")):

983

annots.update(getattr

984

(prop,

985

"_dbus_annotations",

986

{}))

987

for name, value in annots.iteritems():

988

ann_tag = document.createElement(

989

"annotation")

990

ann_tag.setAttribute("name", name)

991

ann_tag.setAttribute("value", value)

992

tag.appendChild(ann_tag)

993

# Add interface annotation tags

994

for annotation, value in dict(

995

itertools.chain.from_iterable(

996

annotations().iteritems()

997

for name, annotations in

998

self._get_all_dbus_things("interface")

999

if name == if_tag.getAttribute("name")

1000

)).iteritems():

1001

ann_tag = document.createElement("annotation")

1002

ann_tag.setAttribute("name", annotation)

1003

ann_tag.setAttribute("value", value)

1004

if_tag.appendChild(ann_tag)

716

1005

# Add the names to the return values for the

717

1006

# "org.freedesktop.DBus.Properties" methods

718

1007

if (if_tag.getAttribute("name")

733

1022

except (AttributeError, xml.dom.DOMException,

734

1023

xml.parsers.expat.ExpatError) as error:

735

1024

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

736

error)

1025

exc_info=error)

737

1026

return xmlstring

738

1027

739

1028

1029

def datetime_to_dbus(dt, variant_level=0):

1030

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

1031

if dt is None:

1032

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

1033

return dbus.String(dt.isoformat(),

1034

variant_level=variant_level)

1035

1036

1037

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1038

"""A class decorator; applied to a subclass of

1039

dbus.service.Object, it will add alternate D-Bus attributes with

1040

interface names according to the "alt_interface_names" mapping.

1041

Usage:

1042

1043

@alternate_dbus_interfaces({"org.example.Interface":

1044

"net.example.AlternateInterface"})

1045

class SampleDBusObject(dbus.service.Object):

1046

@dbus.service.method("org.example.Interface")

1047

def SampleDBusMethod():

1048

pass

1049

1050

The above "SampleDBusMethod" on "SampleDBusObject" will be

1051

reachable via two interfaces: "org.example.Interface" and

1052

"net.example.AlternateInterface", the latter of which will have

1053

its D-Bus annotation "org.freedesktop.DBus.Deprecated" set to

1054

"true", unless "deprecate" is passed with a False value.

1055

1056

This works for methods and signals, and also for D-Bus properties

1057

(from DBusObjectWithProperties) and interfaces (from the

1058

dbus_interface_annotations decorator).

1059

"""

1060

def wrapper(cls):

1061

for orig_interface_name, alt_interface_name in (

1062

alt_interface_names.iteritems()):

1063

attr = {}

1064

interface_names = set()

1065

# Go though all attributes of the class

1066

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

1067

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

1068

# with the wrong interface name

1069

if (not hasattr(attribute, "_dbus_interface")

1070

or not attribute._dbus_interface

1071

.startswith(orig_interface_name)):

1072

continue

1073

# Create an alternate D-Bus interface name based on

1074

# the current name

1075

alt_interface = (attribute._dbus_interface

1076

.replace(orig_interface_name,

1077

alt_interface_name))

1078

interface_names.add(alt_interface)

1079

# Is this a D-Bus signal?

1080

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

1081

# Extract the original non-method undecorated

1082

# function by black magic

1083

nonmethod_func = (dict(

1084

zip(attribute.func_code.co_freevars,

1085

attribute.__closure__))["func"]

1086

.cell_contents)

1087

# Create a new, but exactly alike, function

1088

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

1089

# with the alternate D-Bus interface name

1090

new_function = (dbus.service.signal

1091

(alt_interface,

1092

attribute._dbus_signature)

1093

(types.FunctionType(

1094

nonmethod_func.func_code,

1095

nonmethod_func.func_globals,

1096

nonmethod_func.func_name,

1097

nonmethod_func.func_defaults,

1098

nonmethod_func.func_closure)))

1099

# Copy annotations, if any

1100

try:

1101

new_function._dbus_annotations = (

1102

dict(attribute._dbus_annotations))

1103

except AttributeError:

1104

pass

1105

# Define a creator of a function to call both the

1106

# original and alternate functions, so both the

1107

# original and alternate signals gets sent when

1108

# the function is called

1109

def fixscope(func1, func2):

1110

"""This function is a scope container to pass

1111

func1 and func2 to the "call_both" function

1112

outside of its arguments"""

1113

def call_both(*args, **kwargs):

1114

"""This function will emit two D-Bus

1115

signals by calling func1 and func2"""

1116

func1(*args, **kwargs)

1117

func2(*args, **kwargs)

1118

return call_both

1119

# Create the "call_both" function and add it to

1120

# the class

1121

attr[attrname] = fixscope(attribute, new_function)

1122

# Is this a D-Bus method?

1123

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

1124

# Create a new, but exactly alike, function

1125

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

1126

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

1127

# to the class.

1128

attr[attrname] = (dbus.service.method

1129

(alt_interface,

1130

attribute._dbus_in_signature,

1131

attribute._dbus_out_signature)

1132

(types.FunctionType

1133

(attribute.func_code,

1134

attribute.func_globals,

1135

attribute.func_name,

1136

attribute.func_defaults,

1137

attribute.func_closure)))

1138

# Copy annotations, if any

1139

try:

1140

attr[attrname]._dbus_annotations = (

1141

dict(attribute._dbus_annotations))

1142

except AttributeError:

1143

pass

1144

# Is this a D-Bus property?

1145

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

1146

# Create a new, but exactly alike, function

1147

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

1148

# property with the alternate D-Bus interface

1149

# name. Add it to the class.

1150

attr[attrname] = (dbus_service_property

1151

(alt_interface,

1152

attribute._dbus_signature,

1153

attribute._dbus_access,

1154

attribute

1155

._dbus_get_args_options

1156

["byte_arrays"])

1157

(types.FunctionType

1158

(attribute.func_code,

1159

attribute.func_globals,

1160

attribute.func_name,

1161

attribute.func_defaults,

1162

attribute.func_closure)))

1163

# Copy annotations, if any

1164

try:

1165

attr[attrname]._dbus_annotations = (

1166

dict(attribute._dbus_annotations))

1167

except AttributeError:

1168

pass

1169

# Is this a D-Bus interface?

1170

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

1171

# Create a new, but exactly alike, function

1172

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

1173

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

1174

# to the class.

1175

attr[attrname] = (dbus_interface_annotations

1176

(alt_interface)

1177

(types.FunctionType

1178

(attribute.func_code,

1179

attribute.func_globals,

1180

attribute.func_name,

1181

attribute.func_defaults,

1182

attribute.func_closure)))

1183

if deprecate:

1184

# Deprecate all alternate interfaces

1185

iname="_AlternateDBusNames_interface_annotation{0}"

1186

for interface_name in interface_names:

1187

@dbus_interface_annotations(interface_name)

1188

def func(self):

1189

return { "org.freedesktop.DBus.Deprecated":

1190

"true" }

1191

# Find an unused name

1192

for aname in (iname.format(i)

1193

for i in itertools.count()):

1194

if aname not in attr:

1195

attr[aname] = func

1196

break

1197

if interface_names:

1198

# Replace the class with a new subclass of it with

1199

# methods, signals, etc. as created above.

1200

cls = type(b"{0}Alternate".format(cls.__name__),

1201

(cls,), attr)

1202

return cls

1203

return wrapper

1204

1205

1206

@alternate_dbus_interfaces({"se.recompile.Mandos":

1207

"se.bsnet.fukt.Mandos"})

740

1208

class ClientDBus(Client, DBusObjectWithProperties):

741

1209

"""A Client class using D-Bus

742

1210

751

1219

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

752

1220

753

1221

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

754

self._approvals_pending = 0

755

1222

self.bus = bus

756

1223

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

757

1224

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

763

1230

("/clients/" + client_object_name))

764

1231

DBusObjectWithProperties.__init__(self, self.bus,

765

1232

self.dbus_object_path)

766

767

def _get_approvals_pending(self):

768

return self._approvals_pending

769

def _set_approvals_pending(self, value):

770

old_value = self._approvals_pending

771

self._approvals_pending = value

772

bval = bool(value)

773

if (hasattr(self, "dbus_object_path")

774

and bval is not bool(old_value)):

775

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

776

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

777

dbus_bool)

778

779

approvals_pending = property(_get_approvals_pending,

780

_set_approvals_pending)

781

del _get_approvals_pending, _set_approvals_pending

782

783

@staticmethod

784

def _datetime_to_dbus(dt, variant_level=0):

785

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

786

return dbus.String(dt.isoformat(),

787

variant_level=variant_level)

788

789

def enable(self):

790

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

791

r = Client.enable(self)

792

if oldstate != self.enabled:

793

# Emit D-Bus signals

794

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

795

dbus.Boolean(True, variant_level=1))

796

self.PropertyChanged(

797

dbus.String("LastEnabled"),

798

self._datetime_to_dbus(self.last_enabled,

799

variant_level=1))

800

return r

801

802

def disable(self, quiet = False):

803

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

804

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

805

if not quiet and oldstate != self.enabled:

806

# Emit D-Bus signal

807

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

808

dbus.Boolean(False, variant_level=1))

809

return r

1233

1234

def notifychangeproperty(transform_func,

1235

dbus_name, type_func=lambda x: x,

1236

variant_level=1):

1237

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

1238

its changes to DBus.

1239

1240

transform_fun: Function that takes a value and a variant_level

1241

and transforms it to a D-Bus type.

1242

dbus_name: D-Bus name of the variable

1243

type_func: Function that transform the value before sending it

1244

to the D-Bus. Default: no transform

1245

variant_level: D-Bus variant level. Default: 1

1246

"""

1247

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

1248

def setter(self, value):

1249

if hasattr(self, "dbus_object_path"):

1250

if (not hasattr(self, attrname) or

1251

type_func(getattr(self, attrname, None))

1252

!= type_func(value)):

1253

dbus_value = transform_func(type_func(value),

1254

variant_level

1255

=variant_level)

1256

self.PropertyChanged(dbus.String(dbus_name),

1257

dbus_value)

1258

setattr(self, attrname, value)

1259

1260

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

1261

1262

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1263

approvals_pending = notifychangeproperty(dbus.Boolean,

1264

"ApprovalPending",

1265

type_func = bool)

1266

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

1267

last_enabled = notifychangeproperty(datetime_to_dbus,

1268

"LastEnabled")

1269

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

1270

type_func = lambda checker:

1271

checker is not None)

1272

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1273

"LastCheckedOK")

1274

last_checker_status = notifychangeproperty(dbus.Int16,

1275

"LastCheckerStatus")

1276

last_approval_request = notifychangeproperty(

1277

datetime_to_dbus, "LastApprovalRequest")

1278

approved_by_default = notifychangeproperty(dbus.Boolean,

1279

"ApprovedByDefault")

1280

approval_delay = notifychangeproperty(dbus.UInt64,

1281

"ApprovalDelay",

1282

type_func =

1283

timedelta_to_milliseconds)

1284

approval_duration = notifychangeproperty(

1285

dbus.UInt64, "ApprovalDuration",

1286

type_func = timedelta_to_milliseconds)

1287

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

1288

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

1289

type_func =

1290

timedelta_to_milliseconds)

1291

extended_timeout = notifychangeproperty(

1292

dbus.UInt64, "ExtendedTimeout",

1293

type_func = timedelta_to_milliseconds)

1294

interval = notifychangeproperty(dbus.UInt64,

1295

"Interval",

1296

type_func =

1297

timedelta_to_milliseconds)

1298

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

1299

1300

del notifychangeproperty

810

1301

811

1302

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

812

1303

try:

821

1312

*args, **kwargs):

822

1313

self.checker_callback_tag = None

823

1314

self.checker = None

824

# Emit D-Bus signal

825

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

826

dbus.Boolean(False, variant_level=1))

827

1315

if os.WIFEXITED(condition):

828

1316

exitstatus = os.WEXITSTATUS(condition)

829

1317

# Emit D-Bus signal

839

1327

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

840

1328

*args, **kwargs)

841

1329

842

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

843

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

844

# Emit D-Bus signal

845

self.PropertyChanged(

846

dbus.String("LastCheckedOK"),

847

(self._datetime_to_dbus(self.last_checked_ok,

848

variant_level=1)))

849

850

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

851

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

852

# Emit D-Bus signal

853

self.PropertyChanged(

854

dbus.String("LastApprovalRequest"),

855

(self._datetime_to_dbus(self.last_approval_request,

856

variant_level=1)))

857

return r

858

859

1330

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

860

1331

old_checker = self.checker

861

1332

if self.checker is not None:

868

1339

and old_checker_pid != self.checker.pid):

869

1340

# Emit D-Bus signal

870

1341

self.CheckerStarted(self.current_checker_command)

871

self.PropertyChanged(

872

dbus.String("CheckerRunning"),

873

dbus.Boolean(True, variant_level=1))

874

1342

return r

875

1343

876

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

877

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

878

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

879

if (old_checker is not None

880

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

881

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

882

dbus.Boolean(False, variant_level=1))

883

return r

884

885

1344

def _reset_approved(self):

886

self._approved = None

1345

self.approved = None

887

1346

return False

888

1347

889

1348

def approve(self, value=True):

890

self.send_changedstate()

891

self._approved = value

892

gobject.timeout_add(self._timedelta_to_milliseconds

1349

self.approved = value

1350

gobject.timeout_add(timedelta_to_milliseconds

893

1351

(self.approval_duration),

894

1352

self._reset_approved)

895

1353

self.send_changedstate()

896

1354

897

1355

## D-Bus methods, signals & properties

898

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

1356

_interface = "se.recompile.Mandos.Client"

1357

1358

## Interfaces

1359

1360

@dbus_interface_annotations(_interface)

1361

def _foo(self):

1362

return { "org.freedesktop.DBus.Property.EmitsChangedSignal":

1363

"false"}

899

1364

900

1365

## Signals

901

1366

987

1452

if value is None: # get

988

1453

return dbus.Boolean(self.approved_by_default)

989

1454

self.approved_by_default = bool(value)

990

# Emit D-Bus signal

991

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

992

dbus.Boolean(value, variant_level=1))

993

1455

994

1456

# ApprovalDelay - property

995

1457

@dbus_service_property(_interface, signature="t",

998

1460

if value is None: # get

999

1461

return dbus.UInt64(self.approval_delay_milliseconds())

1000

1462

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

1001

# Emit D-Bus signal

1002

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

1003

dbus.UInt64(value, variant_level=1))

1004

1463

1005

1464

# ApprovalDuration - property

1006

1465

@dbus_service_property(_interface, signature="t",

1007

1466

access="readwrite")

1008

1467

def ApprovalDuration_dbus_property(self, value=None):

1009

1468

if value is None: # get

1010

return dbus.UInt64(self._timedelta_to_milliseconds(

1469

return dbus.UInt64(timedelta_to_milliseconds(

1011

1470

self.approval_duration))

1012

1471

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

1013

# Emit D-Bus signal

1014

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

1015

dbus.UInt64(value, variant_level=1))

1016

1472

1017

1473

# Name - property

1018

1474

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

1030

1486

def Host_dbus_property(self, value=None):

1031

1487

if value is None: # get

1032

1488

return dbus.String(self.host)

1033

self.host = value

1034

# Emit D-Bus signal

1035

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

1036

dbus.String(value, variant_level=1))

1489

self.host = unicode(value)

1037

1490

1038

1491

# Created - property

1039

1492

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

1040

1493

def Created_dbus_property(self):

1041

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

1494

return datetime_to_dbus(self.created)

1042

1495

1043

1496

# LastEnabled - property

1044

1497

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

1045

1498

def LastEnabled_dbus_property(self):

1046

if self.last_enabled is None:

1047

return dbus.String("")

1048

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

1499

return datetime_to_dbus(self.last_enabled)

1049

1500

1050

1501

# Enabled - property

1051

1502

@dbus_service_property(_interface, signature="b",

1065

1516

if value is not None:

1066

1517

self.checked_ok()

1067

1518

return

1068

if self.last_checked_ok is None:

1069

return dbus.String("")

1070

return dbus.String(self._datetime_to_dbus(self

1071

.last_checked_ok))

1519

return datetime_to_dbus(self.last_checked_ok)

1520

1521

# LastCheckerStatus - property

1522

@dbus_service_property(_interface, signature="n",

1523

access="read")

1524

def LastCheckerStatus_dbus_property(self):

1525

return dbus.Int16(self.last_checker_status)

1526

1527

# Expires - property

1528

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

1529

def Expires_dbus_property(self):

1530

return datetime_to_dbus(self.expires)

1072

1531

1073

1532

# LastApprovalRequest - property

1074

1533

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

1075

1534

def LastApprovalRequest_dbus_property(self):

1076

if self.last_approval_request is None:

1077

return dbus.String("")

1078

return dbus.String(self.

1079

_datetime_to_dbus(self

1080

.last_approval_request))

1535

return datetime_to_dbus(self.last_approval_request)

1081

1536

1082

1537

# Timeout - property

1083

1538

@dbus_service_property(_interface, signature="t",

1085

1540

def Timeout_dbus_property(self, value=None):

1086

1541

if value is None: # get

1087

1542

return dbus.UInt64(self.timeout_milliseconds())

1543

old_timeout = self.timeout

1088

1544

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

1089

# Emit D-Bus signal

1090

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

1091

dbus.UInt64(value, variant_level=1))

1092

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

1093

return

1094

# Reschedule timeout

1095

gobject.source_remove(self.disable_initiator_tag)

1096

self.disable_initiator_tag = None

1097

time_to_die = (self.

1098

_timedelta_to_milliseconds((self

1099

.last_checked_ok

1100

+ self.timeout)

1101

- datetime.datetime

1102

.utcnow()))

1103

if time_to_die <= 0:

1104

# The timeout has passed

1105

self.disable()

1106

else:

1107

self.disable_initiator_tag = (gobject.timeout_add

1108

(time_to_die, self.disable))

1545

# Reschedule disabling

1546

if self.enabled:

1547

now = datetime.datetime.utcnow()

1548

self.expires += self.timeout - old_timeout

1549

if self.expires <= now:

1550

# The timeout has passed

1551

self.disable()

1552

else:

1553

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

1554

is None):

1555

return

1556

gobject.source_remove(self.disable_initiator_tag)

1557

self.disable_initiator_tag = (

1558

gobject.timeout_add(

1559

timedelta_to_milliseconds(self.expires - now),

1560

self.disable))

1561

1562

# ExtendedTimeout - property

1563

@dbus_service_property(_interface, signature="t",

1564

access="readwrite")

1565

def ExtendedTimeout_dbus_property(self, value=None):

1566

if value is None: # get

1567

return dbus.UInt64(self.extended_timeout_milliseconds())

1568

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

1109

1569

1110

1570

# Interval - property

1111

1571

@dbus_service_property(_interface, signature="t",

1114

1574

if value is None: # get

1115

1575

return dbus.UInt64(self.interval_milliseconds())

1116

1576

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

1117

# Emit D-Bus signal

1118

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

1119

dbus.UInt64(value, variant_level=1))

1120

1577

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

1121

1578

return

1122

# Reschedule checker run

1123

gobject.source_remove(self.checker_initiator_tag)

1124

self.checker_initiator_tag = (gobject.timeout_add

1125

(value, self.start_checker))

1126

self.start_checker() # Start one now, too

1127

1579

if self.enabled:

1580

# Reschedule checker run

1581

gobject.source_remove(self.checker_initiator_tag)

1582

self.checker_initiator_tag = (gobject.timeout_add

1583

(value, self.start_checker))

1584

self.start_checker() # Start one now, too

1585

1128

1586

# Checker - property

1129

1587

@dbus_service_property(_interface, signature="s",

1130

1588

access="readwrite")

1131

1589

def Checker_dbus_property(self, value=None):

1132

1590

if value is None: # get

1133

1591

return dbus.String(self.checker_command)

1134

self.checker_command = value

1135

# Emit D-Bus signal

1136

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

1137

dbus.String(self.checker_command,

1138

variant_level=1))

1592

self.checker_command = unicode(value)

1139

1593

1140

1594

# CheckerRunning - property

1141

1595

@dbus_service_property(_interface, signature="b",

1168

1622

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

1169

1623

if not self._pipe.recv():

1170

1624

raise KeyError()

1171

1625

1172

1626

def __getattribute__(self, name):

1173

if(name == '_pipe'):

1627

if name == '_pipe':

1174

1628

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

1175

1629

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

1176

1630

data = self._pipe.recv()

1181

1635

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

1182

1636

return self._pipe.recv()[1]

1183

1637

return func

1184

1638

1185

1639

def __setattr__(self, name, value):

1186

if(name == '_pipe'):

1640

if name == '_pipe':

1187

1641

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

1188

1642

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

1189

1643

1200

1654

unicode(self.client_address))

1201

1655

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

1202

1656

self.server.child_pipe.fileno())

1203

1657

1204

1658

session = (gnutls.connection

1205

1659

.ClientSession(self.request,

1206

1660

gnutls.connection

1207

1661

.X509Credentials()))

1208

1662

1209

1663

# Note: gnutls.connection.X509Credentials is really a

1210

1664

# generic GnuTLS certificate credentials object so long as

1211

1665

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

1212

1666

# here despite using OpenPGP certificates.

1213

1667

1214

1668

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

1215

1669

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

1216

1670

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

1222

1676

(gnutls.library.functions

1223

1677

.gnutls_priority_set_direct(session._c_object,

1224

1678

priority, None))

1225

1679

1226

1680

# Start communication using the Mandos protocol

1227

1681

# Get protocol number

1228

1682

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

1233

1687

except (ValueError, IndexError, RuntimeError) as error:

1234

1688

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

1235

1689

return

1236

1690

1237

1691

# Start GnuTLS connection

1238

1692

try:

1239

1693

session.handshake()

1243

1697

# established. Just abandon the request.

1244

1698

return

1245

1699

logger.debug("Handshake succeeded")

1246

1700

1247

1701

approval_required = False

1248

1702

try:

1249

1703

try:

1254

1708

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

1255

1709

return

1256

1710

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

1257

1711

1258

1712

try:

1259

1713

client = ProxyClient(child_pipe, fpr,

1260

1714

self.client_address)

1272

1726

client.name)

1273

1727

if self.server.use_dbus:

1274

1728

# Emit D-Bus signal

1275

client.Rejected("Disabled")

1729

client.Rejected("Disabled")

1276

1730

return

1277

1731

1278

if client._approved or not client.approval_delay:

1732

if client.approved or not client.approval_delay:

1279

1733

#We are approved or approval is disabled

1280

1734

break

1281

elif client._approved is None:

1735

elif client.approved is None:

1282

1736

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

1283

1737

client.name)

1284

1738

if self.server.use_dbus:

1295

1749

return

1296

1750

1297

1751

#wait until timeout or approved

1298

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

1299

1752

time = datetime.datetime.now()

1300

1753

client.changedstate.acquire()

1301

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

1754

client.changedstate.wait(

1755

float(timedelta_to_milliseconds(delay)

1756

/ 1000))

1302

1757

client.changedstate.release()

1303

1758

time2 = datetime.datetime.now()

1304

1759

if (time2 - time) >= delay:

1320

1775

try:

1321

1776

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

1322

1777

except gnutls.errors.GNUTLSError as error:

1323

logger.warning("gnutls send failed")

1778

logger.warning("gnutls send failed",

1779

exc_info=error)

1324

1780

return

1325

1781

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

1326

1782

sent, len(client.secret)

1327

1783

- (sent_size + sent))

1328

1784

sent_size += sent

1329

1785

1330

1786

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

1331

# bump the timeout as if seen

1332

client.checked_ok()

1787

# bump the timeout using extended_timeout

1788

client.bump_timeout(client.extended_timeout)

1333

1789

if self.server.use_dbus:

1334

1790

# Emit D-Bus signal

1335

1791

client.GotSecret()

1340

1796

try:

1341

1797

session.bye()

1342

1798

except gnutls.errors.GNUTLSError as error:

1343

logger.warning("GnuTLS bye failed")

1799

logger.warning("GnuTLS bye failed",

1800

exc_info=error)

1344

1801

1345

1802

@staticmethod

1346

1803

def peer_certificate(session):

1402

1859

# Convert the buffer to a Python bytestring

1403

1860

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

1404

1861

# Convert the bytestring to hexadecimal notation

1405

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

1862

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

1406

1863

return hex_fpr

1407

1864

1408

1865

1411

1868

def sub_process_main(self, request, address):

1412

1869

try:

1413

1870

self.finish_request(request, address)

1414

except:

1871

except Exception:

1415

1872

self.handle_error(request, address)

1416

1873

self.close_request(request)

1417

1874

1418

1875

def process_request(self, request, address):

1419

1876

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

1420

multiprocessing.Process(target = self.sub_process_main,

1421

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

1877

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

1878

args = (request, address))

1879

proc.start()

1880

return proc

1881

1422

1882

1423

1883

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1424

1884

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

1428

1888

This function creates a new pipe in self.pipe

1429

1889

"""

1430

1890

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1431

1432

super(MultiprocessingMixInWithPipe,

1433

self).process_request(request, client_address)

1891

1892

proc = MultiprocessingMixIn.process_request(self, request,

1893

client_address)

1434

1894

self.child_pipe.close()

1435

self.add_pipe(parent_pipe)

1436

1437

def add_pipe(self, parent_pipe):

1895

self.add_pipe(parent_pipe, proc)

1896

1897

def add_pipe(self, parent_pipe, proc):

1438

1898

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

1439

1899

raise NotImplementedError

1440

1900

1901

1441

1902

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1442

1903

socketserver.TCPServer, object):

1443

1904

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

1448

1909

use_ipv6: Boolean; to use IPv6 or not

1449

1910

"""

1450

1911

def __init__(self, server_address, RequestHandlerClass,

1451

interface=None, use_ipv6=True):

1912

interface=None, use_ipv6=True, socketfd=None):

1913

"""If socketfd is set, use that file descriptor instead of

1914

creating a new one with socket.socket().

1915

"""

1452

1916

self.interface = interface

1453

1917

if use_ipv6:

1454

1918

self.address_family = socket.AF_INET6

1919

if socketfd is not None:

1920

# Save the file descriptor

1921

self.socketfd = socketfd

1922

# Save the original socket.socket() function

1923

self.socket_socket = socket.socket

1924

# To implement --socket, we monkey patch socket.socket.

1925

#

1926

# (When socketserver.TCPServer is a new-style class, we

1927

# could make self.socket into a property instead of monkey

1928

# patching socket.socket.)

1929

#

1930

# Create a one-time-only replacement for socket.socket()

1931

@functools.wraps(socket.socket)

1932

def socket_wrapper(*args, **kwargs):

1933

# Restore original function so subsequent calls are

1934

# not affected.

1935

socket.socket = self.socket_socket

1936

del self.socket_socket

1937

# This time only, return a new socket object from the

1938

# saved file descriptor.

1939

return socket.fromfd(self.socketfd, *args, **kwargs)

1940

# Replace socket.socket() function with wrapper

1941

socket.socket = socket_wrapper

1942

# The socketserver.TCPServer.__init__ will call

1943

# socket.socket(), which might be our replacement,

1944

# socket_wrapper(), if socketfd was set.

1455

1945

socketserver.TCPServer.__init__(self, server_address,

1456

1946

RequestHandlerClass)

1947

1457

1948

def server_bind(self):

1458

1949

"""This overrides the normal server_bind() function

1459

1950

to bind to an interface if one was specified, and also NOT to

1467

1958

try:

1468

1959

self.socket.setsockopt(socket.SOL_SOCKET,

1469

1960

SO_BINDTODEVICE,

1470

str(self.interface

1471

+ '\0'))

1961

str(self.interface + '\0'))

1472

1962

except socket.error as error:

1473

if error[0] == errno.EPERM:

1474

logger.error("No permission to"

1475

" bind to interface %s",

1476

self.interface)

1477

elif error[0] == errno.ENOPROTOOPT:

1963

if error.errno == errno.EPERM:

1964

logger.error("No permission to bind to"

1965

" interface %s", self.interface)

1966

elif error.errno == errno.ENOPROTOOPT:

1478

1967

logger.error("SO_BINDTODEVICE not available;"

1479

1968

" cannot bind to interface %s",

1480

1969

self.interface)

1970

elif error.errno == errno.ENODEV:

1971

logger.error("Interface %s does not exist,"

1972

" cannot bind", self.interface)

1481

1973

else:

1482

1974

raise

1483

1975

# Only bind(2) the socket if we really need to.

1513

2005

"""

1514

2006

def __init__(self, server_address, RequestHandlerClass,

1515

2007

interface=None, use_ipv6=True, clients=None,

1516

gnutls_priority=None, use_dbus=True):

2008

gnutls_priority=None, use_dbus=True, socketfd=None):

1517

2009

self.enabled = False

1518

2010

self.clients = clients

1519

2011

if self.clients is None:

1520

self.clients = set()

2012

self.clients = {}

1521

2013

self.use_dbus = use_dbus

1522

2014

self.gnutls_priority = gnutls_priority

1523

2015

IPv6_TCPServer.__init__(self, server_address,

1524

2016

RequestHandlerClass,

1525

2017

interface = interface,

1526

use_ipv6 = use_ipv6)

2018

use_ipv6 = use_ipv6,

2019

socketfd = socketfd)

1527

2020

def server_activate(self):

1528

2021

if self.enabled:

1529

2022

return socketserver.TCPServer.server_activate(self)

2023

1530

2024

def enable(self):

1531

2025

self.enabled = True

1532

def add_pipe(self, parent_pipe):

2026

2027

def add_pipe(self, parent_pipe, proc):

1533

2028

# Call "handle_ipc" for both data and EOF events

1534

2029

gobject.io_add_watch(parent_pipe.fileno(),

1535

2030

gobject.IO_IN | gobject.IO_HUP,

1536

2031

functools.partial(self.handle_ipc,

1537

parent_pipe = parent_pipe))

1538

2032

parent_pipe =

2033

parent_pipe,

2034

proc = proc))

2035

1539

2036

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

1540

client_object=None):

1541

condition_names = {

1542

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

1543

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

1544

# blocking).

1545

gobject.IO_PRI: "PRI", # There is urgent data to read.

1546

gobject.IO_ERR: "ERR", # Error condition.

1547

gobject.IO_HUP: "HUP" # Hung up (the connection has been

1548

# broken, usually for pipes and

1549

# sockets).

1550

}

1551

conditions_string = ' | '.join(name

1552

for cond, name in

1553

condition_names.iteritems()

1554

if cond & condition)

1555

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

1556

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

2037

proc = None, client_object=None):

2038

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

2039

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

2040

# Wait for other process to exit

2041

proc.join()

1557

2042

return False

1558

2043

1559

2044

# Read a request from the child

1564

2049

fpr = request[1]

1565

2050

address = request[2]

1566

2051

1567

for c in self.clients:

2052

for c in self.clients.itervalues():

1568

2053

if c.fingerprint == fpr:

1569

2054

client = c

1570

2055

break

1573

2058

"dress: %s", fpr, address)

1574

2059

if self.use_dbus:

1575

2060

# Emit D-Bus signal

1576

mandos_dbus_service.ClientNotFound(fpr, address[0])

2061

mandos_dbus_service.ClientNotFound(fpr,

2062

address[0])

1577

2063

parent_pipe.send(False)

1578

2064

return False

1579

2065

1580

2066

gobject.io_add_watch(parent_pipe.fileno(),

1581

2067

gobject.IO_IN | gobject.IO_HUP,

1582

2068

functools.partial(self.handle_ipc,

1583

parent_pipe = parent_pipe,

1584

client_object = client))

2069

parent_pipe =

2070

parent_pipe,

2071

proc = proc,

2072

client_object =

2073

client))

1585

2074

parent_pipe.send(True)

1586

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

2075

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

2076

# same fileno

1587

2077

return False

1588

2078

if command == 'funcall':

1589

2079

funcname = request[1]

1590

2080

args = request[2]

1591

2081

kwargs = request[3]

1592

2082

1593

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

1594

2083

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

2084

funcname)(*args,

2085

**kwargs)))

2086

1595

2087

if command == 'getattr':

1596

2088

attrname = request[1]

1597

2089

if callable(client_object.__getattribute__(attrname)):

1598

2090

parent_pipe.send(('function',))

1599

2091

else:

1600

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

2092

parent_pipe.send(('data', client_object

2093

.__getattribute__(attrname)))

1601

2094

1602

2095

if command == 'setattr':

1603

2096

attrname = request[1]

1604

2097

value = request[2]

1605

2098

setattr(client_object, attrname, value)

1606

2099

1607

2100

return True

1608

2101

1609

2102

2103

def rfc3339_duration_to_delta(duration):

2104

"""Parse an RFC 3339 "duration" and return a datetime.timedelta

2105

2106

>>> rfc3339_duration_to_delta("P7D")

2107

datetime.timedelta(7)

2108

>>> rfc3339_duration_to_delta("PT60S")

2109

datetime.timedelta(0, 60)

2110

>>> rfc3339_duration_to_delta("PT60M")

2111

datetime.timedelta(0, 3600)

2112

>>> rfc3339_duration_to_delta("PT24H")

2113

datetime.timedelta(1)

2114

>>> rfc3339_duration_to_delta("P1W")

2115

datetime.timedelta(7)

2116

>>> rfc3339_duration_to_delta("PT5M30S")

2117

datetime.timedelta(0, 330)

2118

>>> rfc3339_duration_to_delta("P1DT3M20S")

2119

datetime.timedelta(1, 200)

2120

"""

2121

2122

# Parsing an RFC 3339 duration with regular expressions is not

2123

# possible - there would have to be multiple places for the same

2124

# values, like seconds. The current code, while more esoteric, is

2125

# cleaner without depending on a parsing library. If Python had a

2126

# built-in library for parsing we would use it, but we'd like to

2127

# avoid excessive use of external libraries.

2128

2129

# New type for defining tokens, syntax, and semantics all-in-one

2130

Token = collections.namedtuple("Token",

2131

("regexp", # To match token; if

2132

# "value" is not None,

2133

# must have a "group"

2134

# containing digits

2135

"value", # datetime.timedelta or

2136

# None

2137

"followers")) # Tokens valid after

2138

# this token

2139

# RFC 3339 "duration" tokens, syntax, and semantics; taken from

2140

# the "duration" ABNF definition in RFC 3339, Appendix A.

2141

token_end = Token(re.compile(r"$"), None, frozenset())

2142

token_second = Token(re.compile(r"(\d+)S"),

2143

datetime.timedelta(seconds=1),

2144

frozenset((token_end,)))

2145

token_minute = Token(re.compile(r"(\d+)M"),

2146

datetime.timedelta(minutes=1),

2147

frozenset((token_second, token_end)))

2148

token_hour = Token(re.compile(r"(\d+)H"),

2149

datetime.timedelta(hours=1),

2150

frozenset((token_minute, token_end)))

2151

token_time = Token(re.compile(r"T"),

2152

None,

2153

frozenset((token_hour, token_minute,

2154

token_second)))

2155

token_day = Token(re.compile(r"(\d+)D"),

2156

datetime.timedelta(days=1),

2157

frozenset((token_time, token_end)))

2158

token_month = Token(re.compile(r"(\d+)M"),

2159

datetime.timedelta(weeks=4),

2160

frozenset((token_day, token_end)))

2161

token_year = Token(re.compile(r"(\d+)Y"),

2162

datetime.timedelta(weeks=52),

2163

frozenset((token_month, token_end)))

2164

token_week = Token(re.compile(r"(\d+)W"),

2165

datetime.timedelta(weeks=1),

2166

frozenset((token_end,)))

2167

token_duration = Token(re.compile(r"P"), None,

2168

frozenset((token_year, token_month,

2169

token_day, token_time,

2170

token_week))),

2171

# Define starting values

2172

value = datetime.timedelta() # Value so far

2173

found_token = None

2174

followers = frozenset(token_duration,) # Following valid tokens

2175

s = duration # String left to parse

2176

# Loop until end token is found

2177

while found_token is not token_end:

2178

# Search for any currently valid tokens

2179

for token in followers:

2180

match = token.regexp.match(s)

2181

if match is not None:

2182

# Token found

2183

if token.value is not None:

2184

# Value found, parse digits

2185

factor = int(match.group(1), 10)

2186

# Add to value so far

2187

value += factor * token.value

2188

# Strip token from string

2189

s = token.regexp.sub("", s, 1)

2190

# Go to found token

2191

found_token = token

2192

# Set valid next tokens

2193

followers = found_token.followers

2194

break

2195

else:

2196

# No currently valid tokens were found

2197

raise ValueError("Invalid RFC 3339 duration")

2198

# End token found

2199

return value

2200

2201

1610

2202

def string_to_delta(interval):

1611

2203

"""Parse a string and return a datetime.timedelta

1612

2204

1623

2215

>>> string_to_delta('5m 30s')

1624

2216

datetime.timedelta(0, 330)

1625

2217

"""

2218

2219

try:

2220

return rfc3339_duration_to_delta(interval)

2221

except ValueError:

2222

pass

2223

1626

2224

timevalue = datetime.timedelta(0)

1627

2225

for s in interval.split():

1628

2226

try:

1639

2237

elif suffix == "w":

1640

2238

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

1641

2239

else:

1642

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

2240

raise ValueError("Unknown suffix {0!r}"

2241

.format(suffix))

1643

2242

except (ValueError, IndexError) as e:

1644

2243

raise ValueError(*(e.args))

1645

2244

timevalue += delta

1646

2245

return timevalue

1647

2246

1648

2247

1649

def if_nametoindex(interface):

1650

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

1651

1652

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

1653

global if_nametoindex

1654

try:

1655

if_nametoindex = (ctypes.cdll.LoadLibrary

1656

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

1657

.if_nametoindex)

1658

except (OSError, AttributeError):

1659

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

1660

def if_nametoindex(interface):

1661

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

1662

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

1663

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

1664

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1665

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

1666

interface))

1667

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

1668

ifreq[16:20])[0]

1669

return interface_index

1670

return if_nametoindex(interface)

1671

1672

1673

2248

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

1674

2249

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

1675

2250

1683

2258

sys.exit()

1684

2259

if not noclose:

1685

2260

# Close all standard open file descriptors

1686

null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)

2261

null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)

1687

2262

if not stat.S_ISCHR(os.fstat(null).st_mode):

1688

2263

raise OSError(errno.ENODEV,

1689

"%s not a character device"

1690

% os.path.devnull)

2264

"{0} not a character device"

2265

.format(os.devnull))

1691

2266

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

1692

2267

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

1693

2268

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

1702

2277

1703

2278

parser = argparse.ArgumentParser()

1704

2279

parser.add_argument("-v", "--version", action="version",

1705

version = "%%(prog)s %s" % version,

2280

version = "%(prog)s {0}".format(version),

1706

2281

help="show version number and exit")

1707

2282

parser.add_argument("-i", "--interface", metavar="IF",

1708

2283

help="Bind to interface IF")

1730

2305

" system bus interface")

1731

2306

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

1732

2307

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

2308

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

2309

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

2310

" state")

2311

parser.add_argument("--socket", type=int,

2312

help="Specify a file descriptor to a network"

2313

" socket to use instead of creating one")

2314

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

2315

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

2316

parser.add_argument("--foreground", action="store_true",

2317

help="Run in foreground")

2318

1733

2319

options = parser.parse_args()

1734

2320

1735

2321

if options.check:

1748

2334

"use_dbus": "True",

1749

2335

"use_ipv6": "True",

1750

2336

"debuglevel": "",

2337

"restore": "True",

2338

"socket": "",

2339

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

2340

"foreground": "False",

1751

2341

}

1752

2342

1753

2343

# Parse config file for server-global settings

1758

2348

# Convert the SafeConfigParser object to a dict

1759

2349

server_settings = server_config.defaults()

1760

2350

# Use the appropriate methods on the non-string config options

1761

for option in ("debug", "use_dbus", "use_ipv6"):

2351

for option in ("debug", "use_dbus", "use_ipv6", "foreground"):

1762

2352

server_settings[option] = server_config.getboolean("DEFAULT",

1763

2353

option)

1764

2354

if server_settings["port"]:

1765

2355

server_settings["port"] = server_config.getint("DEFAULT",

1766

2356

"port")

2357

if server_settings["socket"]:

2358

server_settings["socket"] = server_config.getint("DEFAULT",

2359

"socket")

2360

# Later, stdin will, and stdout and stderr might, be dup'ed

2361

# over with an opened os.devnull. But we don't want this to

2362

# happen with a supplied network socket.

2363

if 0 <= server_settings["socket"] <= 2:

2364

server_settings["socket"] = os.dup(server_settings

2365

["socket"])

1767

2366

del server_config

1768

2367

1769

2368

# Override the settings from the config file with command line

1770

2369

# options, if set.

1771

2370

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

1772

2371

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

1773

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

2372

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

2373

"statedir", "socket", "foreground"):

1774

2374

value = getattr(options, option)

1775

2375

if value is not None:

1776

2376

server_settings[option] = value

1779

2379

for option in server_settings.keys():

1780

2380

if type(server_settings[option]) is str:

1781

2381

server_settings[option] = unicode(server_settings[option])

2382

# Debug implies foreground

2383

if server_settings["debug"]:

2384

server_settings["foreground"] = True

1782

2385

# Now we have our good server settings in "server_settings"

1783

2386

1784

2387

##################################################################

1788

2391

debuglevel = server_settings["debuglevel"]

1789

2392

use_dbus = server_settings["use_dbus"]

1790

2393

use_ipv6 = server_settings["use_ipv6"]

1791

2394

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

2395

stored_state_file)

2396

foreground = server_settings["foreground"]

2397

2398

if debug:

2399

initlogger(debug, logging.DEBUG)

2400

else:

2401

if not debuglevel:

2402

initlogger(debug)

2403

else:

2404

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

2405

initlogger(debug, level)

2406

1792

2407

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

1793

2408

syslogger.setFormatter(logging.Formatter

1794

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

1795

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

1796

% server_settings["servicename"]))

2409

('Mandos ({0}) [%(process)d]:'

2410

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

2411

.format(server_settings

2412

["servicename"])))

1797

2413

1798

2414

# Parse config file with clients

1799

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

1800

"interval": "5m",

1801

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

1802

"host": "",

1803

"approval_delay": "0s",

1804

"approval_duration": "1s",

1805

}

1806

client_config = configparser.SafeConfigParser(client_defaults)

2415

client_config = configparser.SafeConfigParser(Client

2416

.client_defaults)

1807

2417

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

1808

2418

"clients.conf"))

1809

2419

1818

2428

use_ipv6=use_ipv6,

1819

2429

gnutls_priority=

1820

2430

server_settings["priority"],

1821

use_dbus=use_dbus)

1822

if not debug:

2431

use_dbus=use_dbus,

2432

socketfd=(server_settings["socket"]

2433

or None))

2434

if not foreground:

1823

2435

pidfilename = "/var/run/mandos.pid"

2436

pidfile = None

1824

2437

try:

1825

2438

pidfile = open(pidfilename, "w")

1826

except IOError:

1827

logger.error("Could not open file %r", pidfilename)

2439

except IOError as e:

2440

logger.error("Could not open file %r", pidfilename,

2441

exc_info=e)

1828

2442

1829

try:

1830

uid = pwd.getpwnam("_mandos").pw_uid

1831

gid = pwd.getpwnam("_mandos").pw_gid

1832

except KeyError:

2443

for name in ("_mandos", "mandos", "nobody"):

1833

2444

try:

1834

uid = pwd.getpwnam("mandos").pw_uid

1835

gid = pwd.getpwnam("mandos").pw_gid

2445

uid = pwd.getpwnam(name).pw_uid

2446

gid = pwd.getpwnam(name).pw_gid

2447

break

1836

2448

except KeyError:

1837

try:

1838

uid = pwd.getpwnam("nobody").pw_uid

1839

gid = pwd.getpwnam("nobody").pw_gid

1840

except KeyError:

1841

uid = 65534

1842

gid = 65534

2449

continue

2450

else:

2451

uid = 65534

2452

gid = 65534

1843

2453

try:

1844

2454

os.setgid(gid)

1845

2455

os.setuid(uid)

1846

2456

except OSError as error:

1847

if error[0] != errno.EPERM:

2457

if error.errno != errno.EPERM:

1848

2458

raise error

1849

2459

1850

if not debug and not debuglevel:

1851

syslogger.setLevel(logging.WARNING)

1852

console.setLevel(logging.WARNING)

1853

if debuglevel:

1854

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

1855

syslogger.setLevel(level)

1856

console.setLevel(level)

1857

1858

2460

if debug:

1859

2461

# Enable all possible GnuTLS debugging

1860

2462

1870

2472

.gnutls_global_set_log_function(debug_gnutls))

1871

2473

1872

2474

# Redirect stdin so all checkers get /dev/null

1873

null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)

2475

null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)

1874

2476

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

1875

2477

if null > 2:

1876

2478

os.close(null)

1877

else:

1878

# No console logging

1879

logger.removeHandler(console)

1880

2479

1881

2480

# Need to fork before connecting to D-Bus

1882

if not debug:

2481

if not foreground:

1883

2482

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

1884

2483

daemon()

1885

2484

2485

# multiprocessing will use threads, so before we use gobject we

2486

# need to inform gobject that threads will be used.

2487

gobject.threads_init()

2488

1886

2489

global main_loop

1887

2490

# From the Avahi example code

1888

DBusGMainLoop(set_as_default=True )

2491

DBusGMainLoop(set_as_default=True)

1889

2492

main_loop = gobject.MainLoop()

1890

2493

bus = dbus.SystemBus()

1891

2494

# End of Avahi example code

1892

2495

if use_dbus:

1893

2496

try:

1894

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

2497

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

1895

2498

bus, do_not_queue=True)

2499

old_bus_name = (dbus.service.BusName

2500

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

2501

do_not_queue=True))

1896

2502

except dbus.exceptions.NameExistsException as e:

1897

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

2503

logger.error("Disabling D-Bus:", exc_info=e)

1898

2504

use_dbus = False

1899

2505

server_settings["use_dbus"] = False

1900

2506

tcp_server.use_dbus = False

1901

2507

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

1902

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

1903

servicetype = "_mandos._tcp",

1904

protocol = protocol, bus = bus)

2508

service = AvahiServiceToSyslog(name =

2509

server_settings["servicename"],

2510

servicetype = "_mandos._tcp",

2511

protocol = protocol, bus = bus)

1905

2512

if server_settings["interface"]:

1906

2513

service.interface = (if_nametoindex

1907

2514

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

1912

2519

client_class = Client

1913

2520

if use_dbus:

1914

2521

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

1915

def client_config_items(config, section):

1916

special_settings = {

1917

"approved_by_default":

1918

lambda: config.getboolean(section,

1919

"approved_by_default"),

1920

}

1921

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

2522

2523

client_settings = Client.config_parser(client_config)

2524

old_client_settings = {}

2525

clients_data = {}

2526

2527

# Get client data and settings from last running state.

2528

if server_settings["restore"]:

2529

try:

2530

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

2531

clients_data, old_client_settings = (pickle.load

2532

(stored_state))

2533

os.remove(stored_state_path)

2534

except IOError as e:

2535

if e.errno == errno.ENOENT:

2536

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

2537

.format(os.strerror(e.errno)))

2538

else:

2539

logger.critical("Could not load persistent state:",

2540

exc_info=e)

2541

raise

2542

except EOFError as e:

2543

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

2544

"EOFError:", exc_info=e)

2545

2546

with PGPEngine() as pgp:

2547

for client_name, client in clients_data.iteritems():

2548

# Decide which value to use after restoring saved state.

2549

# We have three different values: Old config file,

2550

# new config file, and saved state.

2551

# New config value takes precedence if it differs from old

2552

# config value, otherwise use saved state.

2553

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

2554

try:

2555

# For each value in new config, check if it

2556

# differs from the old config value (Except for

2557

# the "secret" attribute)

2558

if (name != "secret" and

2559

value != old_client_settings[client_name]

2560

[name]):

2561

client[name] = value

2562

except KeyError:

2563

pass

2564

2565

# Clients who has passed its expire date can still be

2566

# enabled if its last checker was successful. Clients

2567

# whose checker succeeded before we stored its state is

2568

# assumed to have successfully run all checkers during

2569

# downtime.

2570

if client["enabled"]:

2571

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

2572

if not client["last_checked_ok"]:

2573

logger.warning(

2574

"disabling client {0} - Client never "

2575

"performed a successful checker"

2576

.format(client_name))

2577

client["enabled"] = False

2578

elif client["last_checker_status"] != 0:

2579

logger.warning(

2580

"disabling client {0} - Client "

2581

"last checker failed with error code {1}"

2582

.format(client_name,

2583

client["last_checker_status"]))

2584

client["enabled"] = False

2585

else:

2586

client["expires"] = (datetime.datetime

2587

.utcnow()

2588

+ client["timeout"])

2589

logger.debug("Last checker succeeded,"

2590

" keeping {0} enabled"

2591

.format(client_name))

1922

2592

try:

1923

yield (name, special_settings[name]())

1924

except KeyError:

1925

yield (name, value)

1926

1927

tcp_server.clients.update(set(

1928

client_class(name = section,

1929

config= dict(client_config_items(

1930

client_config, section)))

1931

for section in client_config.sections()))

2593

client["secret"] = (

2594

pgp.decrypt(client["encrypted_secret"],

2595

client_settings[client_name]

2596

["secret"]))

2597

except PGPError:

2598

# If decryption fails, we use secret from new settings

2599

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

2600

.format(client_name))

2601

client["secret"] = (

2602

client_settings[client_name]["secret"])

2603

2604

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

2605

for client_name in (set(old_client_settings)

2606

- set(client_settings)):

2607

del clients_data[client_name]

2608

for client_name in (set(client_settings)

2609

- set(old_client_settings)):

2610

clients_data[client_name] = client_settings[client_name]

2611

2612

# Create all client objects

2613

for client_name, client in clients_data.iteritems():

2614

tcp_server.clients[client_name] = client_class(

2615

name = client_name, settings = client)

2616

1932

2617

if not tcp_server.clients:

1933

2618

logger.warning("No clients defined")

1934

1935

if not debug:

1936

try:

1937

with pidfile:

1938

pid = os.getpid()

1939

pidfile.write(str(pid) + "\n".encode("utf-8"))

1940

del pidfile

1941

except IOError:

1942

logger.error("Could not write to file %r with PID %d",

1943

pidfilename, pid)

1944

except NameError:

1945

# "pidfile" was never created

1946

pass

2619

2620

if not foreground:

2621

if pidfile is not None:

2622

try:

2623

with pidfile:

2624

pid = os.getpid()

2625

pidfile.write(str(pid) + "\n".encode("utf-8"))

2626

except IOError:

2627

logger.error("Could not write to file %r with PID %d",

2628

pidfilename, pid)

2629

del pidfile

1947

2630

del pidfilename

1948

1949

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

1950

2631

1951

2632

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

1952

2633

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

1953

2634

1954

2635

if use_dbus:

1955

class MandosDBusService(dbus.service.Object):

2636

@alternate_dbus_interfaces({"se.recompile.Mandos":

2637

"se.bsnet.fukt.Mandos"})

2638

class MandosDBusService(DBusObjectWithProperties):

1956

2639

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

1957

2640

def __init__(self):

1958

2641

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

1959

_interface = "se.bsnet.fukt.Mandos"

2642

_interface = "se.recompile.Mandos"

2643

2644

@dbus_interface_annotations(_interface)

2645

def _foo(self):

2646

return { "org.freedesktop.DBus.Property"

2647

".EmitsChangedSignal":

2648

"false"}

1960

2649

1961

2650

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

1962

2651

def ClientAdded(self, objpath):

1977

2666

def GetAllClients(self):

1978

2667

"D-Bus method"

1979

2668

return dbus.Array(c.dbus_object_path

1980

for c in tcp_server.clients)

2669

for c in

2670

tcp_server.clients.itervalues())

1981

2671

1982

2672

@dbus.service.method(_interface,

1983

2673

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

1985

2675

"D-Bus method"

1986

2676

return dbus.Dictionary(

1987

2677

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

1988

for c in tcp_server.clients),

2678

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

1989

2679

signature="oa{sv}")

1990

2680

1991

2681

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

1992

2682

def RemoveClient(self, object_path):

1993

2683

"D-Bus method"

1994

for c in tcp_server.clients:

2684

for c in tcp_server.clients.itervalues():

1995

2685

if c.dbus_object_path == object_path:

1996

tcp_server.clients.remove(c)

2686

del tcp_server.clients[c.name]

1997

2687

c.remove_from_connection()

1998

2688

# Don't signal anything except ClientRemoved

1999

2689

c.disable(quiet=True)

2010

2700

"Cleanup function; run on exit"

2011

2701

service.cleanup()

2012

2702

2703

multiprocessing.active_children()

2704

if not (tcp_server.clients or client_settings):

2705

return

2706

2707

# Store client before exiting. Secrets are encrypted with key

2708

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

2709

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

2710

clients = {}

2711

with PGPEngine() as pgp:

2712

for client in tcp_server.clients.itervalues():

2713

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

2714

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

2715

key)

2716

client_dict = {}

2717

2718

# A list of attributes that can not be pickled

2719

# + secret.

2720

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

2721

"checker"))

2722

for name, typ in (inspect.getmembers

2723

(dbus.service.Object)):

2724

exclude.add(name)

2725

2726

client_dict["encrypted_secret"] = (client

2727

.encrypted_secret)

2728

for attr in client.client_structure:

2729

if attr not in exclude:

2730

client_dict[attr] = getattr(client, attr)

2731

2732

clients[client.name] = client_dict

2733

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

2734

2735

try:

2736

with (tempfile.NamedTemporaryFile

2737

(mode='wb', suffix=".pickle", prefix='clients-',

2738

dir=os.path.dirname(stored_state_path),

2739

delete=False)) as stored_state:

2740

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

2741

tempname=stored_state.name

2742

os.rename(tempname, stored_state_path)

2743

except (IOError, OSError) as e:

2744

if not debug:

2745

try:

2746

os.remove(tempname)

2747

except NameError:

2748

pass

2749

if e.errno in (errno.ENOENT, errno.EACCES, errno.EEXIST):

2750

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

2751

.format(os.strerror(e.errno)))

2752

else:

2753

logger.warning("Could not save persistent state:",

2754

exc_info=e)

2755

raise e

2756

2757

# Delete all clients, and settings from config

2013

2758

while tcp_server.clients:

2014

client = tcp_server.clients.pop()

2759

name, client = tcp_server.clients.popitem()

2015

2760

if use_dbus:

2016

2761

client.remove_from_connection()

2017

client.disable_hook = None

2018

2762

# Don't signal anything except ClientRemoved

2019

2763

client.disable(quiet=True)

2020

2764

if use_dbus:

2021

2765

# Emit D-Bus signal

2022

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2766

mandos_dbus_service.ClientRemoved(client

2767

.dbus_object_path,

2023

2768

client.name)

2769

client_settings.clear()

2024

2770

2025

2771

atexit.register(cleanup)

2026

2772

2027

for client in tcp_server.clients:

2773

for client in tcp_server.clients.itervalues():

2028

2774

if use_dbus:

2029

2775

# Emit D-Bus signal

2030

2776

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2031

client.enable()

2777

# Need to initiate checking of clients

2778

if client.enabled:

2779

client.init_checker()

2032

2780

2033

2781

tcp_server.enable()

2034

2782

tcp_server.server_activate()

2037

2785

service.port = tcp_server.socket.getsockname()[1]

2038

2786

if use_ipv6:

2039

2787

logger.info("Now listening on address %r, port %d,"

2040

" flowinfo %d, scope_id %d"

2041

% tcp_server.socket.getsockname())

2788

" flowinfo %d, scope_id %d",

2789

*tcp_server.socket.getsockname())

2042

2790

else: # IPv4

2043

logger.info("Now listening on address %r, port %d"

2044

% tcp_server.socket.getsockname())

2791

logger.info("Now listening on address %r, port %d",

2792

*tcp_server.socket.getsockname())

2045

2793

2046

2794

#service.interface = tcp_server.socket.getsockname()[3]

2047

2795

2050

2798

try:

2051

2799

service.activate()

2052

2800

except dbus.exceptions.DBusException as error:

2053

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

2801

logger.critical("D-Bus Exception", exc_info=error)

2054

2802

cleanup()

2055

2803

sys.exit(1)

2056

2804

# End of Avahi example code

2063

2811

logger.debug("Starting main loop")

2064

2812

main_loop.run()

2065

2813

except AvahiError as error:

2066

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

2814

logger.critical("Avahi Error", exc_info=error)

2067

2815

cleanup()

2068

2816

sys.exit(1)

2069

2817

except KeyboardInterrupt: