/mandos/trunk : revision 482

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#!/usr/bin/python2.7

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#!/usr/bin/python

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# -*- mode: python; coding: utf-8 -*-

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#

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# Mandos server - give out binary blobs to connecting clients.

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

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#

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# Everything else is

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#

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

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

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# along with this program. If not, see

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

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#

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

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

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#

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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from future_builtins import *

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try:

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import SocketServer as socketserver

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except ImportError:

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import socketserver

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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 datetime

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import gnutls.library.functions

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import gnutls.library.constants

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import gnutls.library.types

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try:

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import ConfigParser as configparser

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except ImportError:

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import configparser

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import ConfigParser as configparser

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import sys

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import re

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import os

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import struct

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import fcntl

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import functools

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try:

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import cPickle as pickle

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except ImportError:

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import pickle

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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 codecs

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import dbus

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import dbus.service

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try:

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import gobject

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except ImportError:

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from gi.repository import GObject as gobject

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import gobject

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import avahi

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from dbus.mainloop.glib import DBusGMainLoop

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import ctypes

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except ImportError:

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SO_BINDTODEVICE = None

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if sys.version_info.major == 2:

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str = unicode

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version = "1.6.9"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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syslogger = None

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try:

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if_nametoindex = ctypes.cdll.LoadLibrary(

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ctypes.util.find_library("c")).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(b"16s16x", interface))

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interface_index = struct.unpack("I", 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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global syslogger

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syslogger = (logging.handlers.SysLogHandler(

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facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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address = "/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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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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encoded = b"mandos" + binascii.hexlify(password)

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if len(encoded) > 2048:

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# GnuPG can't handle long passwords, so encode differently

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encoded = (b"mandos" + password.replace(b"\\", b"\\\\")

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.replace(b"\n", b"\\n")

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.replace(b"\0", b"\\x00"))

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return encoded

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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(

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dir=self.tempdir) 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(

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dir = self.tempdir) 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 = 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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version = "1.3.0"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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class AvahiError(Exception):

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

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self.value = value

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return super(AvahiError, self).__init__(value, *args,

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**kwargs)

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super(AvahiError, self).__init__(value, *args, **kwargs)

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def __unicode__(self):

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return unicode(repr(self.value))

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class AvahiServiceError(AvahiError):

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pass

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class AvahiGroupError(AvahiError):

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pass

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

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

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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,

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interface = avahi.IF_UNSPEC,

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name = None,

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servicetype = None,

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port = None,

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TXT = None,

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domain = "",

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host = "",

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max_renames = 32768,

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protocol = avahi.PROTO_UNSPEC,

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bus = None):

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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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protocol = avahi.PROTO_UNSPEC, bus = None):

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self.interface = interface

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self.name = name

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self.type = servicetype

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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, remove=True):

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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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logger.critical("No suitable Zeroconf service name found"

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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 = str(

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self.server.GetAlternativeServiceName(self.name))

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self.rename_count += 1

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

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

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self.name)

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if remove:

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self.remove()

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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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if (error.get_dbus_name()

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== "org.freedesktop.Avahi.CollisionError"):

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logger.info("Local Zeroconf service name collision.")

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return self.rename(remove=False)

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else:

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.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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pass

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self.group = None

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match.remove()

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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if self.group is None:

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self.group = dbus.Interface(

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self.bus.get_object(avahi.DBUS_NAME,

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self.server.EntryGroupNew()),

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.group = dbus.Interface(

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self.bus.get_object(avahi.DBUS_NAME,

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self.server.EntryGroupNew(),

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follow_name_owner_changes=True),

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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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self.rename()

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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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str(error))

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raise AvahiGroupError("State changed: {!s}".format(error))

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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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def cleanup(self):

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

372

if self.group is not None:

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try:

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self.group.Free()

375

except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException):

377

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"""

383

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

384

bad_states = {

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avahi.SERVER_INVALID: "Zeroconf server invalid",

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avahi.SERVER_REGISTERING: None,

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avahi.SERVER_COLLISION: "Zeroconf server name collision",

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avahi.SERVER_FAILURE: "Zeroconf server failure",

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}

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bad_states = { avahi.SERVER_INVALID:

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"Zeroconf server invalid",

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avahi.SERVER_REGISTERING: None,

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avahi.SERVER_COLLISION:

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"Zeroconf server name collision",

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avahi.SERVER_FAILURE:

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"Zeroconf server failure" }

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if state in bad_states:

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if bad_states[state] is not None:

392

if error is None:

393

logger.error(bad_states[state])

394

else:

395

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

396

self.cleanup()

239

if bad_states[state]:

240

logger.error(bad_states[state])

241

self.remove()

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elif state == avahi.SERVER_RUNNING:

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243

self.add()

399

244

else:

400

if error is None:

401

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

402

else:

403

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

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245

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

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def activate(self):

406

247

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

407

248

if self.server is None:

411

252

follow_name_owner_changes=True),

412

253

avahi.DBUS_INTERFACE_SERVER)

413

254

self.server.connect_to_signal("StateChanged",

414

self.server_state_changed)

255

self.server_state_changed)

415

256

self.server_state_changed(self.server.GetState())

416

257

417

258

418

class AvahiServiceToSyslog(AvahiService):

419

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

420

"""Add the new name to the syslog messages"""

421

ret = AvahiService.rename(self, *args, **kwargs)

422

syslogger.setFormatter(logging.Formatter(

423

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

424

.format(self.name)))

425

return ret

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427

428

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class Client(object):

429

260

"""A representation of a client host served by this server.

430

261

431

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Attributes:

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approved: bool(); 'None' if not yet approved/disapproved

263

_approved: bool(); 'None' if not yet approved/disapproved

433

264

approval_delay: datetime.timedelta(); Time to wait for approval

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approval_duration: datetime.timedelta(); Duration of one approval

435

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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

444

275

created: datetime.datetime(); (UTC) object creation

445

client_structure: Object describing what attributes a client has

446

and is used for storing the client at exit

447

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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)

448

278

disable_initiator_tag: a gobject event source tag, or None

449

279

enabled: bool()

450

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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

454

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

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

456

last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

458

checker, -2 means no checker completed yet.

459

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

286

last_enabled: datetime.datetime(); (UTC)

460

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

461

288

D-Bus identifiers

462

289

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

463

290

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

464

291

until this client is disabled

465

extended_timeout: extra long timeout when secret has been sent

466

292

runtime_expansions: Allowed attributes for runtime expansion.

467

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

468

disabled, or None

469

server_settings: The server_settings dict from main()

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293

"""

471

294

472

295

runtime_expansions = ("approval_delay", "approval_duration",

473

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

474

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

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"last_approval_request", "last_checked_ok",

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

297

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

476

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

477

client_defaults = {

478

"timeout": "PT5M",

479

"extended_timeout": "PT15M",

480

"interval": "PT2M",

481

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

482

"host": "",

483

"approval_delay": "PT0S",

484

"approval_duration": "PT1S",

485

"approved_by_default": "True",

486

"enabled": "True",

487

}

488

299

489

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@staticmethod

490

def config_parser(config):

491

"""Construct a new dict of client settings of this form:

492

{ client_name: {setting_name: value, ...}, ...}

493

with exceptions for any special settings as defined above.

494

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

495

value given the same arguments.

496

"""

497

settings = {}

498

for client_name in config.sections():

499

section = dict(config.items(client_name))

500

client = settings[client_name] = {}

501

502

client["host"] = section["host"]

503

# Reformat values from string types to Python types

504

client["approved_by_default"] = config.getboolean(

505

client_name, "approved_by_default")

506

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

507

"enabled")

508

509

# Uppercase and remove spaces from fingerprint for later

510

# comparison purposes with return value from the

511

# fingerprint() function

512

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

513

.replace(" ", ""))

514

if "secret" in section:

515

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

516

elif "secfile" in section:

517

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

518

(section["secfile"])),

519

"rb") as secfile:

520

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

521

else:

522

raise TypeError("No secret or secfile for section {}"

523

.format(section))

524

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

525

client["extended_timeout"] = string_to_delta(

526

section["extended_timeout"])

527

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

528

client["approval_delay"] = string_to_delta(

529

section["approval_delay"])

530

client["approval_duration"] = string_to_delta(

531

section["approval_duration"])

532

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

533

client["last_approval_request"] = None

534

client["last_checked_ok"] = None

535

client["last_checker_status"] = -2

536

537

return settings

538

539

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

301

def _timedelta_to_milliseconds(td):

302

"Convert a datetime.timedelta() to milliseconds"

303

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

304

+ (td.seconds * 1000)

305

+ (td.microseconds // 1000))

306

307

def timeout_milliseconds(self):

308

"Return the 'timeout' attribute in milliseconds"

309

return self._timedelta_to_milliseconds(self.timeout)

310

311

def interval_milliseconds(self):

312

"Return the 'interval' attribute in milliseconds"

313

return self._timedelta_to_milliseconds(self.interval)

314

315

def approval_delay_milliseconds(self):

316

return self._timedelta_to_milliseconds(self.approval_delay)

317

318

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

319

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

320

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

321

attribute."""

540

322

self.name = name

541

if server_settings is None:

542

server_settings = {}

543

self.server_settings = server_settings

544

# adding all client settings

545

for setting, value in settings.items():

546

setattr(self, setting, value)

547

548

if self.enabled:

549

if not hasattr(self, "last_enabled"):

550

self.last_enabled = datetime.datetime.utcnow()

551

if not hasattr(self, "expires"):

552

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

553

+ self.timeout)

554

else:

555

self.last_enabled = None

556

self.expires = None

557

323

if config is None:

324

config = {}

558

325

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

326

# Uppercase and remove spaces from fingerprint for later

327

# comparison purposes with return value from the fingerprint()

328

# function

329

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

330

.replace(" ", ""))

559

331

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

560

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

561

datetime.datetime.utcnow())

562

563

# attributes specific for this server instance

332

if "secret" in config:

333

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

334

elif "secfile" in config:

335

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

336

(config["secfile"])),

337

"rb") as secfile:

338

self.secret = secfile.read()

339

else:

340

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

341

% self.name)

342

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

343

self.created = datetime.datetime.utcnow()

344

self.enabled = False

345

self.last_approval_request = None

346

self.last_enabled = None

347

self.last_checked_ok = None

348

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

349

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

350

self.disable_hook = disable_hook

564

351

self.checker = None

565

352

self.checker_initiator_tag = None

566

353

self.disable_initiator_tag = None

567

354

self.checker_callback_tag = None

355

self.checker_command = config["checker"]

568

356

self.current_checker_command = None

569

self.approved = None

357

self.last_connect = None

358

self._approved = None

359

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

360

True)

570

361

self.approvals_pending = 0

571

self.changedstate = multiprocessing_manager.Condition(

572

multiprocessing_manager.Lock())

573

self.client_structure = [attr

574

for attr in self.__dict__.iterkeys()

575

if not attr.startswith("_")]

576

self.client_structure.append("client_structure")

577

578

for name, t in inspect.getmembers(

579

type(self), lambda obj: isinstance(obj, property)):

580

if not name.startswith("_"):

581

self.client_structure.append(name)

362

self.approval_delay = string_to_delta(

363

config["approval_delay"])

364

self.approval_duration = string_to_delta(

365

config["approval_duration"])

366

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

582

367

583

# Send notice to process children that client state has changed

584

368

def send_changedstate(self):

585

with self.changedstate:

586

self.changedstate.notify_all()

587

369

self.changedstate.acquire()

370

self.changedstate.notify_all()

371

self.changedstate.release()

372

588

373

def enable(self):

589

374

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

590

375

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

591

376

# Already enabled

592

377

return

593

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

594

self.enabled = True

378

self.send_changedstate()

595

379

self.last_enabled = datetime.datetime.utcnow()

596

self.init_checker()

597

self.send_changedstate()

380

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

381

# and every interval from then on.

382

self.checker_initiator_tag = (gobject.timeout_add

383

(self.interval_milliseconds(),

384

self.start_checker))

385

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

386

self.disable_initiator_tag = (gobject.timeout_add

387

(self.timeout_milliseconds(),

388

self.disable))

389

self.enabled = True

390

# Also start a new checker *right now*.

391

self.start_checker()

598

392

599

393

def disable(self, quiet=True):

600

394

"""Disable this client."""

601

395

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

602

396

return False

603

397

if not quiet:

398

self.send_changedstate()

399

if not quiet:

604

400

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

605

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

401

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

606

402

gobject.source_remove(self.disable_initiator_tag)

607

403

self.disable_initiator_tag = None

608

self.expires = None

609

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

404

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

610

405

gobject.source_remove(self.checker_initiator_tag)

611

406

self.checker_initiator_tag = None

612

407

self.stop_checker()

408

if self.disable_hook:

409

self.disable_hook(self)

613

410

self.enabled = False

614

if not quiet:

615

self.send_changedstate()

616

411

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

617

412

return False

618

413

619

414

def __del__(self):

415

self.disable_hook = None

620

416

self.disable()

621

417

622

def init_checker(self):

623

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

624

# and every interval from then on.

625

if self.checker_initiator_tag is not None:

626

gobject.source_remove(self.checker_initiator_tag)

627

self.checker_initiator_tag = gobject.timeout_add(

628

int(self.interval.total_seconds() * 1000),

629

self.start_checker)

630

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

631

if self.disable_initiator_tag is not None:

632

gobject.source_remove(self.disable_initiator_tag)

633

self.disable_initiator_tag = gobject.timeout_add(

634

int(self.timeout.total_seconds() * 1000), self.disable)

635

# Also start a new checker *right now*.

636

self.start_checker()

637

638

418

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

639

419

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

640

420

self.checker_callback_tag = None

641

421

self.checker = None

642

422

if os.WIFEXITED(condition):

643

self.last_checker_status = os.WEXITSTATUS(condition)

644

if self.last_checker_status == 0:

423

exitstatus = os.WEXITSTATUS(condition)

424

if exitstatus == 0:

645

425

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

646

426

vars(self))

647

427

self.checked_ok()

648

428

else:

649

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

429

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

430

vars(self))

650

431

else:

651

self.last_checker_status = -1

652

432

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

653

433

vars(self))

654

434

655

435

def checked_ok(self):

656

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

436

"""Bump up the timeout for this client.

437

438

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

439

alive and well.

440

"""

657

441

self.last_checked_ok = datetime.datetime.utcnow()

658

self.last_checker_status = 0

659

self.bump_timeout()

660

661

def bump_timeout(self, timeout=None):

662

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

663

if timeout is None:

664

timeout = self.timeout

665

if self.disable_initiator_tag is not None:

666

gobject.source_remove(self.disable_initiator_tag)

667

self.disable_initiator_tag = None

668

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

669

self.disable_initiator_tag = gobject.timeout_add(

670

int(timeout.total_seconds() * 1000), self.disable)

671

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

442

gobject.source_remove(self.disable_initiator_tag)

443

self.disable_initiator_tag = (gobject.timeout_add

444

(self.timeout_milliseconds(),

445

self.disable))

672

446

673

447

def need_approval(self):

674

448

self.last_approval_request = datetime.datetime.utcnow()

679

453

If a checker already exists, leave it running and do

680

454

nothing."""

681

455

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

682

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

683

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

684

# would inevitably timeout, since no checker would get a

685

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

456

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

457

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

458

# client would inevitably timeout, since no checker would get

459

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

686

460

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

687

461

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

688

462

# should be.

690

464

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

691

465

try:

692

466

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

693

except AttributeError:

694

pass

695

except OSError as error:

696

if error.errno != errno.ECHILD:

697

raise

467

except (AttributeError, OSError) as error:

468

if (isinstance(error, OSError)

469

and error.errno != errno.ECHILD):

470

raise error

698

471

else:

699

472

if pid:

700

473

logger.warning("Checker was a zombie")

703

476

self.current_checker_command)

704

477

# Start a new checker if needed

705

478

if self.checker is None:

706

# Escape attributes for the shell

707

escaped_attrs = {

708

attr: re.escape(str(getattr(self, attr)))

709

for attr in self.runtime_expansions }

710

479

try:

711

command = self.checker_command % escaped_attrs

712

except TypeError as error:

713

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

714

self.checker_command,

715

exc_info=error)

716

return True # Try again later

480

# In case checker_command has exactly one % operator

481

command = self.checker_command % self.host

482

except TypeError:

483

# Escape attributes for the shell

484

escaped_attrs = dict(

485

(attr,

486

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

487

errors=

488

'replace')))

489

for attr in

490

self.runtime_expansions)

491

492

try:

493

command = self.checker_command % escaped_attrs

494

except TypeError as error:

495

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

496

' %s', self.checker_command, error)

497

return True # Try again later

717

498

self.current_checker_command = command

718

499

try:

719

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

720

self.name)

500

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

501

command, self.name)

721

502

# We don't need to redirect stdout and stderr, since

722

503

# in normal mode, that is already done by daemon(),

723

504

# and in debug mode we don't want to. (Stdin is

724

505

# always replaced by /dev/null.)

725

# The exception is when not debugging but nevertheless

726

# running in the foreground; use the previously

727

# created wnull.

728

popen_args = {}

729

if (not self.server_settings["debug"]

730

and self.server_settings["foreground"]):

731

popen_args.update({"stdout": wnull,

732

"stderr": wnull })

733

506

self.checker = subprocess.Popen(command,

734

507

close_fds=True,

735

shell=True,

736

cwd="/",

737

**popen_args)

738

except OSError as error:

739

logger.error("Failed to start subprocess",

740

exc_info=error)

741

return True

742

self.checker_callback_tag = gobject.child_watch_add(

743

self.checker.pid, self.checker_callback, data=command)

744

# The checker may have completed before the gobject

745

# watch was added. Check for this.

746

try:

508

shell=True, cwd="/")

509

self.checker_callback_tag = (gobject.child_watch_add

510

(self.checker.pid,

511

self.checker_callback,

512

data=command))

513

# The checker may have completed before the gobject

514

# watch was added. Check for this.

747

515

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

516

if pid:

517

gobject.source_remove(self.checker_callback_tag)

518

self.checker_callback(pid, status, command)

748

519

except OSError as error:

749

if error.errno == errno.ECHILD:

750

# This should never happen

751

logger.error("Child process vanished",

752

exc_info=error)

753

return True

754

raise

755

if pid:

756

gobject.source_remove(self.checker_callback_tag)

757

self.checker_callback(pid, status, command)

520

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

521

error)

758

522

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

759

523

return True

760

524

767

531

return

768

532

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

769

533

try:

770

self.checker.terminate()

534

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

771

535

#time.sleep(0.5)

772

536

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

773

# self.checker.kill()

537

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

774

538

except OSError as error:

775

539

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

776

540

raise

777

541

self.checker = None

778

542

779

780

def dbus_service_property(dbus_interface,

781

signature="v",

782

access="readwrite",

783

byte_arrays=False):

543

def dbus_service_property(dbus_interface, signature="v",

544

access="readwrite", byte_arrays=False):

784

545

"""Decorators for marking methods of a DBusObjectWithProperties to

785

546

become properties on the D-Bus.

786

547

795

556

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

796

557

if byte_arrays and signature != "ay":

797

558

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

798

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

799

559

" signature %r" % signature)

800

560

def decorator(func):

801

561

func._dbus_is_property = True

802

562

func._dbus_interface = dbus_interface

807

567

func._dbus_name = func._dbus_name[:-14]

808

568

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

809

569

return func

810

811

return decorator

812

813

814

def dbus_interface_annotations(dbus_interface):

815

"""Decorator for marking functions returning interface annotations

816

817

Usage:

818

819

@dbus_interface_annotations("org.example.Interface")

820

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

821

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

822

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

823

"false"}

824

"""

825

826

def decorator(func):

827

func._dbus_is_interface = True

828

func._dbus_interface = dbus_interface

829

func._dbus_name = dbus_interface

830

return func

831

832

return decorator

833

834

835

def dbus_annotations(annotations):

836

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

837

Usage:

838

839

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

840

"org.freedesktop.DBus.Property."

841

"EmitsChangedSignal": "false"})

842

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

843

access="r")

844

def Property_dbus_property(self):

845

return dbus.Boolean(False)

846

"""

847

848

def decorator(func):

849

func._dbus_annotations = annotations

850

return func

851

852

570

return decorator

853

571

854

572

855

573

class DBusPropertyException(dbus.exceptions.DBusException):

856

574

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

857

575

"""

858

pass

576

def __unicode__(self):

577

return unicode(str(self))

859

578

860

579

861

580

class DBusPropertyAccessException(DBusPropertyException):

872

591

873

592

class DBusObjectWithProperties(dbus.service.Object):

874

593

"""A D-Bus object with properties.

875

594

876

595

Classes inheriting from this can use the dbus_service_property

877

596

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

878

597

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

879

598

"""

880

599

881

600

@staticmethod

882

def _is_dbus_thing(thing):

883

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

884

885

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

886

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

887

"""

888

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

889

False)

601

def _is_dbus_property(obj):

602

return getattr(obj, "_dbus_is_property", False)

890

603

891

def _get_all_dbus_things(self, thing):

604

def _get_all_dbus_properties(self):

892

605

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

893

606

"""

894

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

895

athing.__get__(self))

896

for cls in self.__class__.__mro__

897

for name, athing in

898

inspect.getmembers(cls, self._is_dbus_thing(thing)))

607

return ((prop._dbus_name, prop)

608

for name, prop in

609

inspect.getmembers(self, self._is_dbus_property))

899

610

900

611

def _get_dbus_property(self, interface_name, property_name):

901

612

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

902

613

property with the specified name and interface.

903

614

"""

904

for cls in self.__class__.__mro__:

905

for name, value in inspect.getmembers(

906

cls, self._is_dbus_thing("property")):

907

if (value._dbus_name == property_name

908

and value._dbus_interface == interface_name):

909

return value.__get__(self)

910

615

for name in (property_name,

616

property_name + "_dbus_property"):

617

prop = getattr(self, name, None)

618

if (prop is None

619

or not self._is_dbus_property(prop)

620

or prop._dbus_name != property_name

621

or (interface_name and prop._dbus_interface

622

and interface_name != prop._dbus_interface)):

623

continue

624

return prop

911

625

# No such property

912

raise DBusPropertyNotFound("{}:{}.{}".format(

913

self.dbus_object_path, interface_name, property_name))

626

raise DBusPropertyNotFound(self.dbus_object_path + ":"

627

+ interface_name + "."

628

+ property_name)

914

629

915

@dbus.service.method(dbus.PROPERTIES_IFACE,

916

in_signature="ss",

630

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

917

631

out_signature="v")

918

632

def Get(self, interface_name, property_name):

919

633

"""Standard D-Bus property Get() method, see D-Bus standard.

937

651

# The byte_arrays option is not supported yet on

938

652

# signatures other than "ay".

939

653

if prop._dbus_signature != "ay":

940

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

941

"'ay' signature {!r}"

942

.format(prop._dbus_signature))

943

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

944

for byte in value))

654

raise ValueError

655

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

656

for byte in value))

945

657

prop(value)

946

658

947

@dbus.service.method(dbus.PROPERTIES_IFACE,

948

in_signature="s",

659

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

949

660

out_signature="a{sv}")

950

661

def GetAll(self, interface_name):

951

662

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

952

663

standard.

953

664

954

665

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

955

666

"""

956

properties = {}

957

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

667

all = {}

668

for name, prop in self._get_all_dbus_properties():

958

669

if (interface_name

959

670

and interface_name != prop._dbus_interface):

960

671

# Interface non-empty but did not match

964

675

continue

965

676

value = prop()

966

677

if not hasattr(value, "variant_level"):

967

properties[name] = value

678

all[name] = value

968

679

continue

969

properties[name] = type(value)(

970

value, variant_level = value.variant_level + 1)

971

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

972

973

@dbus.service.signal(dbus.PROPERTIES_IFACE, signature="sa{sv}as")

974

def PropertiesChanged(self, interface_name, changed_properties,

975

invalidated_properties):

976

"""Standard D-Bus PropertiesChanged() signal, see D-Bus

977

standard.

978

"""

979

pass

680

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

681

value.variant_level+1)

682

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

980

683

981

684

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

982

685

out_signature="s",

983

686

path_keyword='object_path',

984

687

connection_keyword='connection')

985

688

def Introspect(self, object_path, connection):

986

"""Overloading of standard D-Bus method.

987

988

Inserts property tags and interface annotation tags.

689

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

989

690

"""

990

691

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

991

692

connection)

992

693

try:

993

694

document = xml.dom.minidom.parseString(xmlstring)

994

995

695

def make_tag(document, name, prop):

996

696

e = document.createElement("property")

997

697

e.setAttribute("name", name)

998

698

e.setAttribute("type", prop._dbus_signature)

999

699

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

1000

700

return e

1001

1002

701

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

1003

# Add property tags

1004

702

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

1005

703

for name, prop

1006

in self._get_all_dbus_things("property")

704

in self._get_all_dbus_properties()

1007

705

if prop._dbus_interface

1008

706

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

1009

707

if_tag.appendChild(tag)

1010

# Add annotation tags

1011

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

1012

for tag in if_tag.getElementsByTagName(typ):

1013

annots = dict()

1014

for name, prop in (self.

1015

_get_all_dbus_things(typ)):

1016

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

1017

and prop._dbus_interface

1018

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

1019

annots.update(getattr(

1020

prop, "_dbus_annotations", {}))

1021

for name, value in annots.items():

1022

ann_tag = document.createElement(

1023

"annotation")

1024

ann_tag.setAttribute("name", name)

1025

ann_tag.setAttribute("value", value)

1026

tag.appendChild(ann_tag)

1027

# Add interface annotation tags

1028

for annotation, value in dict(

1029

itertools.chain.from_iterable(

1030

annotations().items()

1031

for name, annotations

1032

in self._get_all_dbus_things("interface")

1033

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

1034

)).items():

1035

ann_tag = document.createElement("annotation")

1036

ann_tag.setAttribute("name", annotation)

1037

ann_tag.setAttribute("value", value)

1038

if_tag.appendChild(ann_tag)

1039

708

# Add the names to the return values for the

1040

709

# "org.freedesktop.DBus.Properties" methods

1041

710

if (if_tag.getAttribute("name")

1056

725

except (AttributeError, xml.dom.DOMException,

1057

726

xml.parsers.expat.ExpatError) as error:

1058

727

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

1059

exc_info=error)

728

error)

1060

729

return xmlstring

1061

730

1062

731

1063

def datetime_to_dbus(dt, variant_level=0):

1064

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

1065

if dt is None:

1066

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

1067

return dbus.String(dt.isoformat(), variant_level=variant_level)

1068

1069

1070

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1071

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

1072

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

1073

interface names according to the "alt_interface_names" mapping.

1074

Usage:

1075

1076

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

1077

"net.example.AlternateInterface"})

1078

class SampleDBusObject(dbus.service.Object):

1079

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

1080

def SampleDBusMethod():

1081

pass

1082

1083

The above "SampleDBusMethod" on "SampleDBusObject" will be

1084

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

1085

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

1086

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

1087

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

1088

1089

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

1090

(from DBusObjectWithProperties) and interfaces (from the

1091

dbus_interface_annotations decorator).

1092

"""

1093

1094

def wrapper(cls):

1095

for orig_interface_name, alt_interface_name in (

1096

alt_interface_names.items()):

1097

attr = {}

1098

interface_names = set()

1099

# Go though all attributes of the class

1100

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

1101

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

1102

# with the wrong interface name

1103

if (not hasattr(attribute, "_dbus_interface")

1104

or not attribute._dbus_interface.startswith(

1105

orig_interface_name)):

1106

continue

1107

# Create an alternate D-Bus interface name based on

1108

# the current name

1109

alt_interface = attribute._dbus_interface.replace(

1110

orig_interface_name, alt_interface_name)

1111

interface_names.add(alt_interface)

1112

# Is this a D-Bus signal?

1113

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

1114

# Extract the original non-method undecorated

1115

# function by black magic

1116

nonmethod_func = (dict(

1117

zip(attribute.func_code.co_freevars,

1118

attribute.__closure__))

1119

["func"].cell_contents)

1120

# Create a new, but exactly alike, function

1121

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

1122

# with the alternate D-Bus interface name

1123

new_function = (dbus.service.signal(

1124

alt_interface, attribute._dbus_signature)

1125

(types.FunctionType(

1126

nonmethod_func.func_code,

1127

nonmethod_func.func_globals,

1128

nonmethod_func.func_name,

1129

nonmethod_func.func_defaults,

1130

nonmethod_func.func_closure)))

1131

# Copy annotations, if any

1132

try:

1133

new_function._dbus_annotations = dict(

1134

attribute._dbus_annotations)

1135

except AttributeError:

1136

pass

1137

# Define a creator of a function to call both the

1138

# original and alternate functions, so both the

1139

# original and alternate signals gets sent when

1140

# the function is called

1141

def fixscope(func1, func2):

1142

"""This function is a scope container to pass

1143

func1 and func2 to the "call_both" function

1144

outside of its arguments"""

1145

1146

def call_both(*args, **kwargs):

1147

"""This function will emit two D-Bus

1148

signals by calling func1 and func2"""

1149

func1(*args, **kwargs)

1150

func2(*args, **kwargs)

1151

1152

return call_both

1153

# Create the "call_both" function and add it to

1154

# the class

1155

attr[attrname] = fixscope(attribute, new_function)

1156

# Is this a D-Bus method?

1157

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

1158

# Create a new, but exactly alike, function

1159

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

1160

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

1161

# to the class.

1162

attr[attrname] = (

1163

dbus.service.method(

1164

alt_interface,

1165

attribute._dbus_in_signature,

1166

attribute._dbus_out_signature)

1167

(types.FunctionType(attribute.func_code,

1168

attribute.func_globals,

1169

attribute.func_name,

1170

attribute.func_defaults,

1171

attribute.func_closure)))

1172

# Copy annotations, if any

1173

try:

1174

attr[attrname]._dbus_annotations = dict(

1175

attribute._dbus_annotations)

1176

except AttributeError:

1177

pass

1178

# Is this a D-Bus property?

1179

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

1180

# Create a new, but exactly alike, function

1181

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

1182

# property with the alternate D-Bus interface

1183

# name. Add it to the class.

1184

attr[attrname] = (dbus_service_property(

1185

alt_interface, attribute._dbus_signature,

1186

attribute._dbus_access,

1187

attribute._dbus_get_args_options

1188

["byte_arrays"])

1189

(types.FunctionType(

1190

attribute.func_code,

1191

attribute.func_globals,

1192

attribute.func_name,

1193

attribute.func_defaults,

1194

attribute.func_closure)))

1195

# Copy annotations, if any

1196

try:

1197

attr[attrname]._dbus_annotations = dict(

1198

attribute._dbus_annotations)

1199

except AttributeError:

1200

pass

1201

# Is this a D-Bus interface?

1202

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

1203

# Create a new, but exactly alike, function

1204

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

1205

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

1206

# to the class.

1207

attr[attrname] = (

1208

dbus_interface_annotations(alt_interface)

1209

(types.FunctionType(attribute.func_code,

1210

attribute.func_globals,

1211

attribute.func_name,

1212

attribute.func_defaults,

1213

attribute.func_closure)))

1214

if deprecate:

1215

# Deprecate all alternate interfaces

1216

iname="_AlternateDBusNames_interface_annotation{}"

1217

for interface_name in interface_names:

1218

1219

@dbus_interface_annotations(interface_name)

1220

def func(self):

1221

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

1222

"true" }

1223

# Find an unused name

1224

for aname in (iname.format(i)

1225

for i in itertools.count()):

1226

if aname not in attr:

1227

attr[aname] = func

1228

break

1229

if interface_names:

1230

# Replace the class with a new subclass of it with

1231

# methods, signals, etc. as created above.

1232

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

1233

(cls, ), attr)

1234

return cls

1235

1236

return wrapper

1237

1238

1239

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

1240

"se.bsnet.fukt.Mandos"})

1241

732

class ClientDBus(Client, DBusObjectWithProperties):

1242

733

"""A Client class using D-Bus

1243

734

1247

738

"""

1248

739

1249

740

runtime_expansions = (Client.runtime_expansions

1250

+ ("dbus_object_path", ))

1251

1252

_interface = "se.recompile.Mandos.Client"

741

+ ("dbus_object_path",))

1253

742

1254

743

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

1255

744

1256

745

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

746

self._approvals_pending = 0

1257

747

self.bus = bus

1258

748

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

1259

749

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

1260

750

# the D-Bus

1261

client_object_name = str(self.name).translate(

751

client_object_name = unicode(self.name).translate(

1262

752

{ord("."): ord("_"),

1263

753

ord("-"): ord("_")})

1264

self.dbus_object_path = dbus.ObjectPath(

1265

"/clients/" + client_object_name)

754

self.dbus_object_path = (dbus.ObjectPath

755

("/clients/" + client_object_name))

1266

756

DBusObjectWithProperties.__init__(self, self.bus,

1267

757

self.dbus_object_path)

1268

1269

def notifychangeproperty(transform_func, dbus_name,

1270

type_func=lambda x: x,

1271

variant_level=1,

1272

invalidate_only=False,

1273

_interface=_interface):

1274

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

1275

its changes to DBus.

1276

1277

transform_fun: Function that takes a value and a variant_level

1278

and transforms it to a D-Bus type.

1279

dbus_name: D-Bus name of the variable

1280

type_func: Function that transform the value before sending it

1281

to the D-Bus. Default: no transform

1282

variant_level: D-Bus variant level. Default: 1

1283

"""

1284

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

1285

1286

def setter(self, value):

1287

if hasattr(self, "dbus_object_path"):

1288

if (not hasattr(self, attrname) or

1289

type_func(getattr(self, attrname, None))

1290

!= type_func(value)):

1291

if invalidate_only:

1292

self.PropertiesChanged(

1293

_interface, dbus.Dictionary(),

1294

dbus.Array((dbus_name, )))

1295

else:

1296

dbus_value = transform_func(

1297

type_func(value),

1298

variant_level = variant_level)

1299

self.PropertyChanged(dbus.String(dbus_name),

1300

dbus_value)

1301

self.PropertiesChanged(

1302

_interface,

1303

dbus.Dictionary({ dbus.String(dbus_name):

1304

dbus_value }),

1305

dbus.Array())

1306

setattr(self, attrname, value)

1307

1308

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

1309

1310

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1311

approvals_pending = notifychangeproperty(dbus.Boolean,

1312

"ApprovalPending",

1313

type_func = bool)

1314

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

1315

last_enabled = notifychangeproperty(datetime_to_dbus,

1316

"LastEnabled")

1317

checker = notifychangeproperty(

1318

dbus.Boolean, "CheckerRunning",

1319

type_func = lambda checker: checker is not None)

1320

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1321

"LastCheckedOK")

1322

last_checker_status = notifychangeproperty(dbus.Int16,

1323

"LastCheckerStatus")

1324

last_approval_request = notifychangeproperty(

1325

datetime_to_dbus, "LastApprovalRequest")

1326

approved_by_default = notifychangeproperty(dbus.Boolean,

1327

"ApprovedByDefault")

1328

approval_delay = notifychangeproperty(

1329

dbus.UInt64, "ApprovalDelay",

1330

type_func = lambda td: td.total_seconds() * 1000)

1331

approval_duration = notifychangeproperty(

1332

dbus.UInt64, "ApprovalDuration",

1333

type_func = lambda td: td.total_seconds() * 1000)

1334

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

1335

timeout = notifychangeproperty(

1336

dbus.UInt64, "Timeout",

1337

type_func = lambda td: td.total_seconds() * 1000)

1338

extended_timeout = notifychangeproperty(

1339

dbus.UInt64, "ExtendedTimeout",

1340

type_func = lambda td: td.total_seconds() * 1000)

1341

interval = notifychangeproperty(

1342

dbus.UInt64, "Interval",

1343

type_func = lambda td: td.total_seconds() * 1000)

1344

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

1345

secret = notifychangeproperty(dbus.ByteArray, "Secret",

1346

invalidate_only=True)

1347

1348

del notifychangeproperty

758

759

def _get_approvals_pending(self):

760

return self._approvals_pending

761

def _set_approvals_pending(self, value):

762

old_value = self._approvals_pending

763

self._approvals_pending = value

764

bval = bool(value)

765

if (hasattr(self, "dbus_object_path")

766

and bval is not bool(old_value)):

767

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

768

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

769

dbus_bool)

770

771

approvals_pending = property(_get_approvals_pending,

772

_set_approvals_pending)

773

del _get_approvals_pending, _set_approvals_pending

774

775

@staticmethod

776

def _datetime_to_dbus(dt, variant_level=0):

777

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

778

return dbus.String(dt.isoformat(),

779

variant_level=variant_level)

780

781

def enable(self):

782

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

783

r = Client.enable(self)

784

if oldstate != self.enabled:

785

# Emit D-Bus signals

786

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

787

dbus.Boolean(True, variant_level=1))

788

self.PropertyChanged(

789

dbus.String("LastEnabled"),

790

self._datetime_to_dbus(self.last_enabled,

791

variant_level=1))

792

return r

793

794

def disable(self, quiet = False):

795

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

796

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

797

if not quiet and oldstate != self.enabled:

798

# Emit D-Bus signal

799

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

800

dbus.Boolean(False, variant_level=1))

801

return r

1349

802

1350

803

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

1351

804

try:

1360

813

*args, **kwargs):

1361

814

self.checker_callback_tag = None

1362

815

self.checker = None

816

# Emit D-Bus signal

817

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

818

dbus.Boolean(False, variant_level=1))

1363

819

if os.WIFEXITED(condition):

1364

820

exitstatus = os.WEXITSTATUS(condition)

1365

821

# Emit D-Bus signal

1375

831

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

1376

832

*args, **kwargs)

1377

833

834

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

835

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

836

# Emit D-Bus signal

837

self.PropertyChanged(

838

dbus.String("LastCheckedOK"),

839

(self._datetime_to_dbus(self.last_checked_ok,

840

variant_level=1)))

841

842

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

843

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

844

# Emit D-Bus signal

845

self.PropertyChanged(

846

dbus.String("LastApprovalRequest"),

847

(self._datetime_to_dbus(self.last_approval_request,

848

variant_level=1)))

849

return r

850

1378

851

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

1379

old_checker_pid = getattr(self.checker, "pid", None)

852

old_checker = self.checker

853

if self.checker is not None:

854

old_checker_pid = self.checker.pid

855

else:

856

old_checker_pid = None

1380

857

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

1381

858

# Only if new checker process was started

1382

859

if (self.checker is not None

1383

860

and old_checker_pid != self.checker.pid):

1384

861

# Emit D-Bus signal

1385

862

self.CheckerStarted(self.current_checker_command)

863

self.PropertyChanged(

864

dbus.String("CheckerRunning"),

865

dbus.Boolean(True, variant_level=1))

1386

866

return r

1387

867

868

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

869

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

870

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

871

if (old_checker is not None

872

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

873

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

874

dbus.Boolean(False, variant_level=1))

875

return r

876

1388

877

def _reset_approved(self):

1389

self.approved = None

878

self._approved = None

1390

879

return False

1391

880

1392

881

def approve(self, value=True):

1393

self.approved = value

1394

gobject.timeout_add(int(self.approval_duration.total_seconds()

1395

* 1000), self._reset_approved)

1396

882

self.send_changedstate()

883

self._approved = value

884

gobject.timeout_add(self._timedelta_to_milliseconds

885

(self.approval_duration),

886

self._reset_approved)

887

1397

888

1398

889

## D-Bus methods, signals & properties

1399

1400

## Interfaces

890

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

1401

891

1402

892

## Signals

1403

893

1414

904

pass

1415

905

1416

906

# PropertyChanged - signal

1417

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

1418

907

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

1419

908

def PropertyChanged(self, property, value):

1420

909

"D-Bus signal"

1484

973

return dbus.Boolean(bool(self.approvals_pending))

1485

974

1486

975

# ApprovedByDefault - property

1487

@dbus_service_property(_interface,

1488

signature="b",

976

@dbus_service_property(_interface, signature="b",

1489

977

access="readwrite")

1490

978

def ApprovedByDefault_dbus_property(self, value=None):

1491

979

if value is None: # get

1492

980

return dbus.Boolean(self.approved_by_default)

1493

981

self.approved_by_default = bool(value)

982

# Emit D-Bus signal

983

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

984

dbus.Boolean(value, variant_level=1))

1494

985

1495

986

# ApprovalDelay - property

1496

@dbus_service_property(_interface,

1497

signature="t",

987

@dbus_service_property(_interface, signature="t",

1498

988

access="readwrite")

1499

989

def ApprovalDelay_dbus_property(self, value=None):

1500

990

if value is None: # get

1501

return dbus.UInt64(self.approval_delay.total_seconds()

1502

* 1000)

991

return dbus.UInt64(self.approval_delay_milliseconds())

1503

992

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

993

# Emit D-Bus signal

994

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

995

dbus.UInt64(value, variant_level=1))

1504

996

1505

997

# ApprovalDuration - property

1506

@dbus_service_property(_interface,

1507

signature="t",

998

@dbus_service_property(_interface, signature="t",

1508

999

access="readwrite")

1509

1000

def ApprovalDuration_dbus_property(self, value=None):

1510

1001

if value is None: # get

1511

return dbus.UInt64(self.approval_duration.total_seconds()

1512

* 1000)

1002

return dbus.UInt64(self._timedelta_to_milliseconds(

1003

self.approval_duration))

1513

1004

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

1005

# Emit D-Bus signal

1006

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

1007

dbus.UInt64(value, variant_level=1))

1514

1008

1515

1009

# Name - property

1516

1010

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

1523

1017

return dbus.String(self.fingerprint)

1524

1018

1525

1019

# Host - property

1526

@dbus_service_property(_interface,

1527

signature="s",

1020

@dbus_service_property(_interface, signature="s",

1528

1021

access="readwrite")

1529

1022

def Host_dbus_property(self, value=None):

1530

1023

if value is None: # get

1531

1024

return dbus.String(self.host)

1532

self.host = str(value)

1025

self.host = value

1026

# Emit D-Bus signal

1027

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

1028

dbus.String(value, variant_level=1))

1533

1029

1534

1030

# Created - property

1535

1031

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

1536

1032

def Created_dbus_property(self):

1537

return datetime_to_dbus(self.created)

1033

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

1538

1034

1539

1035

# LastEnabled - property

1540

1036

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

1541

1037

def LastEnabled_dbus_property(self):

1542

return datetime_to_dbus(self.last_enabled)

1038

if self.last_enabled is None:

1039

return dbus.String("")

1040

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

1543

1041

1544

1042

# Enabled - property

1545

@dbus_service_property(_interface,

1546

signature="b",

1043

@dbus_service_property(_interface, signature="b",

1547

1044

access="readwrite")

1548

1045

def Enabled_dbus_property(self, value=None):

1549

1046

if value is None: # get

1554

1051

self.disable()

1555

1052

1556

1053

# LastCheckedOK - property

1557

@dbus_service_property(_interface,

1558

signature="s",

1054

@dbus_service_property(_interface, signature="s",

1559

1055

access="readwrite")

1560

1056

def LastCheckedOK_dbus_property(self, value=None):

1561

1057

if value is not None:

1562

1058

self.checked_ok()

1563

1059

return

1564

return datetime_to_dbus(self.last_checked_ok)

1565

1566

# LastCheckerStatus - property

1567

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

1568

def LastCheckerStatus_dbus_property(self):

1569

return dbus.Int16(self.last_checker_status)

1570

1571

# Expires - property

1572

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

1573

def Expires_dbus_property(self):

1574

return datetime_to_dbus(self.expires)

1060

if self.last_checked_ok is None:

1061

return dbus.String("")

1062

return dbus.String(self._datetime_to_dbus(self

1063

.last_checked_ok))

1575

1064

1576

1065

# LastApprovalRequest - property

1577

1066

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

1578

1067

def LastApprovalRequest_dbus_property(self):

1579

return datetime_to_dbus(self.last_approval_request)

1068

if self.last_approval_request is None:

1069

return dbus.String("")

1070

return dbus.String(self.

1071

_datetime_to_dbus(self

1072

.last_approval_request))

1580

1073

1581

1074

# Timeout - property

1582

@dbus_service_property(_interface,

1583

signature="t",

1075

@dbus_service_property(_interface, signature="t",

1584

1076

access="readwrite")

1585

1077

def Timeout_dbus_property(self, value=None):

1586

1078

if value is None: # get

1587

return dbus.UInt64(self.timeout.total_seconds() * 1000)

1588

old_timeout = self.timeout

1079

return dbus.UInt64(self.timeout_milliseconds())

1589

1080

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

1590

# Reschedule disabling

1591

if self.enabled:

1592

now = datetime.datetime.utcnow()

1593

self.expires += self.timeout - old_timeout

1594

if self.expires <= now:

1595

# The timeout has passed

1596

self.disable()

1597

else:

1598

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

1599

is None):

1600

return

1601

gobject.source_remove(self.disable_initiator_tag)

1602

self.disable_initiator_tag = gobject.timeout_add(

1603

int((self.expires - now).total_seconds() * 1000),

1604

self.disable)

1605

1606

# ExtendedTimeout - property

1607

@dbus_service_property(_interface,

1608

signature="t",

1609

access="readwrite")

1610

def ExtendedTimeout_dbus_property(self, value=None):

1611

if value is None: # get

1612

return dbus.UInt64(self.extended_timeout.total_seconds()

1613

* 1000)

1614

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

1081

# Emit D-Bus signal

1082

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

1083

dbus.UInt64(value, variant_level=1))

1084

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

1085

return

1086

# Reschedule timeout

1087

gobject.source_remove(self.disable_initiator_tag)

1088

self.disable_initiator_tag = None

1089

time_to_die = (self.

1090

_timedelta_to_milliseconds((self

1091

.last_checked_ok

1092

+ self.timeout)

1093

- datetime.datetime

1094

.utcnow()))

1095

if time_to_die <= 0:

1096

# The timeout has passed

1097

self.disable()

1098

else:

1099

self.disable_initiator_tag = (gobject.timeout_add

1100

(time_to_die, self.disable))

1615

1101

1616

1102

# Interval - property

1617

@dbus_service_property(_interface,

1618

signature="t",

1103

@dbus_service_property(_interface, signature="t",

1619

1104

access="readwrite")

1620

1105

def Interval_dbus_property(self, value=None):

1621

1106

if value is None: # get

1622

return dbus.UInt64(self.interval.total_seconds() * 1000)

1107

return dbus.UInt64(self.interval_milliseconds())

1623

1108

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

1109

# Emit D-Bus signal

1110

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

1111

dbus.UInt64(value, variant_level=1))

1624

1112

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

1625

1113

return

1626

if self.enabled:

1627

# Reschedule checker run

1628

gobject.source_remove(self.checker_initiator_tag)

1629

self.checker_initiator_tag = gobject.timeout_add(

1630

value, self.start_checker)

1631

self.start_checker() # Start one now, too

1632

1114

# Reschedule checker run

1115

gobject.source_remove(self.checker_initiator_tag)

1116

self.checker_initiator_tag = (gobject.timeout_add

1117

(value, self.start_checker))

1118

self.start_checker() # Start one now, too

1119

1633

1120

# Checker - property

1634

@dbus_service_property(_interface,

1635

signature="s",

1121

@dbus_service_property(_interface, signature="s",

1636

1122

access="readwrite")

1637

1123

def Checker_dbus_property(self, value=None):

1638

1124

if value is None: # get

1639

1125

return dbus.String(self.checker_command)

1640

self.checker_command = str(value)

1126

self.checker_command = value

1127

# Emit D-Bus signal

1128

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

1129

dbus.String(self.checker_command,

1130

variant_level=1))

1641

1131

1642

1132

# CheckerRunning - property

1643

@dbus_service_property(_interface,

1644

signature="b",

1133

@dbus_service_property(_interface, signature="b",

1645

1134

access="readwrite")

1646

1135

def CheckerRunning_dbus_property(self, value=None):

1647

1136

if value is None: # get

1657

1146

return self.dbus_object_path # is already a dbus.ObjectPath

1658

1147

1659

1148

# Secret = property

1660

@dbus_service_property(_interface,

1661

signature="ay",

1662

access="write",

1663

byte_arrays=True)

1149

@dbus_service_property(_interface, signature="ay",

1150

access="write", byte_arrays=True)

1664

1151

def Secret_dbus_property(self, value):

1665

self.secret = bytes(value)

1152

self.secret = str(value)

1666

1153

1667

1154

del _interface

1668

1155

1672

1159

self._pipe = child_pipe

1673

1160

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

1674

1161

if not self._pipe.recv():

1675

raise KeyError(fpr)

1676

1162

raise KeyError()

1163

1677

1164

def __getattribute__(self, name):

1678

if name == '_pipe':

1165

if(name == '_pipe'):

1679

1166

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

1680

1167

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

1681

1168

data = self._pipe.recv()

1682

1169

if data[0] == 'data':

1683

1170

return data[1]

1684

1171

if data[0] == 'function':

1685

1686

1172

def func(*args, **kwargs):

1687

1173

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

1688

1174

return self._pipe.recv()[1]

1689

1690

1175

return func

1691

1176

1692

1177

def __setattr__(self, name, value):

1693

if name == '_pipe':

1178

if(name == '_pipe'):

1694

1179

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

1695

1180

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

1696

1181

1704

1189

def handle(self):

1705

1190

with contextlib.closing(self.server.child_pipe) as child_pipe:

1706

1191

logger.info("TCP connection from: %s",

1707

str(self.client_address))

1192

unicode(self.client_address))

1708

1193

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

1709

1194

self.server.child_pipe.fileno())

1710

1711

session = gnutls.connection.ClientSession(

1712

self.request, gnutls.connection .X509Credentials())

1713

1195

1196

session = (gnutls.connection

1197

.ClientSession(self.request,

1198

gnutls.connection

1199

.X509Credentials()))

1200

1714

1201

# Note: gnutls.connection.X509Credentials is really a

1715

1202

# generic GnuTLS certificate credentials object so long as

1716

1203

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

1717

1204

# here despite using OpenPGP certificates.

1718

1205

1719

1206

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

1720

1207

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

1721

1208

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

1724

1211

priority = self.server.gnutls_priority

1725

1212

if priority is None:

1726

1213

priority = "NORMAL"

1727

gnutls.library.functions.gnutls_priority_set_direct(

1728

session._c_object, priority, None)

1729

1214

(gnutls.library.functions

1215

.gnutls_priority_set_direct(session._c_object,

1216

priority, None))

1217

1730

1218

# Start communication using the Mandos protocol

1731

1219

# Get protocol number

1732

1220

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

1733

1221

logger.debug("Protocol version: %r", line)

1734

1222

try:

1735

1223

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

1736

raise RuntimeError(line)

1224

raise RuntimeError

1737

1225

except (ValueError, IndexError, RuntimeError) as error:

1738

1226

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

1739

1227

return

1740

1228

1741

1229

# Start GnuTLS connection

1742

1230

try:

1743

1231

session.handshake()

1747

1235

# established. Just abandon the request.

1748

1236

return

1749

1237

logger.debug("Handshake succeeded")

1750

1238

1751

1239

approval_required = False

1752

1240

try:

1753

1241

try:

1754

fpr = self.fingerprint(

1755

self.peer_certificate(session))

1242

fpr = self.fingerprint(self.peer_certificate

1243

(session))

1756

1244

except (TypeError,

1757

1245

gnutls.errors.GNUTLSError) as error:

1758

1246

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

1759

1247

return

1760

1248

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

1761

1249

1762

1250

try:

1763

1251

client = ProxyClient(child_pipe, fpr,

1764

1252

self.client_address)

1772

1260

1773

1261

while True:

1774

1262

if not client.enabled:

1775

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

1776

client.name)

1263

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

1264

client.name)

1777

1265

if self.server.use_dbus:

1778

1266

# Emit D-Bus signal

1779

client.Rejected("Disabled")

1267

client.Rejected("Disabled")

1780

1268

return

1781

1269

1782

if client.approved or not client.approval_delay:

1270

if client._approved or not client.approval_delay:

1783

1271

#We are approved or approval is disabled

1784

1272

break

1785

elif client.approved is None:

1273

elif client._approved is None:

1786

1274

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

1787

1275

client.name)

1788

1276

if self.server.use_dbus:

1789

1277

# Emit D-Bus signal

1790

1278

client.NeedApproval(

1791

client.approval_delay.total_seconds()

1792

* 1000, client.approved_by_default)

1279

client.approval_delay_milliseconds(),

1280

client.approved_by_default)

1793

1281

else:

1794

1282

logger.warning("Client %s was not approved",

1795

1283

client.name)

1799

1287

return

1800

1288

1801

1289

#wait until timeout or approved

1290

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

1802

1291

time = datetime.datetime.now()

1803

1292

client.changedstate.acquire()

1804

client.changedstate.wait(delay.total_seconds())

1293

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

1805

1294

client.changedstate.release()

1806

1295

time2 = datetime.datetime.now()

1807

1296

if (time2 - time) >= delay:

1823

1312

try:

1824

1313

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

1825

1314

except gnutls.errors.GNUTLSError as error:

1826

logger.warning("gnutls send failed",

1827

exc_info=error)

1315

logger.warning("gnutls send failed")

1828

1316

return

1829

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

1830

len(client.secret) - (sent_size

1831

+ sent))

1317

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

1318

sent, len(client.secret)

1319

- (sent_size + sent))

1832

1320

sent_size += sent

1833

1321

1834

1322

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

1835

# bump the timeout using extended_timeout

1836

client.bump_timeout(client.extended_timeout)

1323

# bump the timeout as if seen

1324

client.checked_ok()

1837

1325

if self.server.use_dbus:

1838

1326

# Emit D-Bus signal

1839

1327

client.GotSecret()

1844

1332

try:

1845

1333

session.bye()

1846

1334

except gnutls.errors.GNUTLSError as error:

1847

logger.warning("GnuTLS bye failed",

1848

exc_info=error)

1335

logger.warning("GnuTLS bye failed")

1849

1336

1850

1337

@staticmethod

1851

1338

def peer_certificate(session):

1852

1339

"Return the peer's OpenPGP certificate as a bytestring"

1853

1340

# If not an OpenPGP certificate...

1854

if (gnutls.library.functions.gnutls_certificate_type_get(

1855

session._c_object)

1341

if (gnutls.library.functions

1342

.gnutls_certificate_type_get(session._c_object)

1856

1343

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

1857

1344

# ...do the normal thing

1858

1345

return session.peer_certificate

1872

1359

def fingerprint(openpgp):

1873

1360

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

1874

1361

# New GnuTLS "datum" with the OpenPGP public key

1875

datum = gnutls.library.types.gnutls_datum_t(

1876

ctypes.cast(ctypes.c_char_p(openpgp),

1877

ctypes.POINTER(ctypes.c_ubyte)),

1878

ctypes.c_uint(len(openpgp)))

1362

datum = (gnutls.library.types

1363

.gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),

1364

ctypes.POINTER

1365

(ctypes.c_ubyte)),

1366

ctypes.c_uint(len(openpgp))))

1879

1367

# New empty GnuTLS certificate

1880

1368

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1881

gnutls.library.functions.gnutls_openpgp_crt_init(

1882

ctypes.byref(crt))

1369

(gnutls.library.functions

1370

.gnutls_openpgp_crt_init(ctypes.byref(crt)))

1883

1371

# Import the OpenPGP public key into the certificate

1884

gnutls.library.functions.gnutls_openpgp_crt_import(

1885

crt, ctypes.byref(datum),

1886

gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)

1372

(gnutls.library.functions

1373

.gnutls_openpgp_crt_import(crt, ctypes.byref(datum),

1374

gnutls.library.constants

1375

.GNUTLS_OPENPGP_FMT_RAW))

1887

1376

# Verify the self signature in the key

1888

1377

crtverify = ctypes.c_uint()

1889

gnutls.library.functions.gnutls_openpgp_crt_verify_self(

1890

crt, 0, ctypes.byref(crtverify))

1378

(gnutls.library.functions

1379

.gnutls_openpgp_crt_verify_self(crt, 0,

1380

ctypes.byref(crtverify)))

1891

1381

if crtverify.value != 0:

1892

1382

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1893

raise gnutls.errors.CertificateSecurityError(

1894

"Verify failed")

1383

raise (gnutls.errors.CertificateSecurityError

1384

("Verify failed"))

1895

1385

# New buffer for the fingerprint

1896

1386

buf = ctypes.create_string_buffer(20)

1897

1387

buf_len = ctypes.c_size_t()

1898

1388

# Get the fingerprint from the certificate into the buffer

1899

gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint(

1900

crt, ctypes.byref(buf), ctypes.byref(buf_len))

1389

(gnutls.library.functions

1390

.gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),

1391

ctypes.byref(buf_len)))

1901

1392

# Deinit the certificate

1902

1393

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1903

1394

# Convert the buffer to a Python bytestring

1904

1395

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

1905

1396

# Convert the bytestring to hexadecimal notation

1906

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

1397

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

1907

1398

return hex_fpr

1908

1399

1909

1400

1910

1401

class MultiprocessingMixIn(object):

1911

1402

"""Like socketserver.ThreadingMixIn, but with multiprocessing"""

1912

1913

1403

def sub_process_main(self, request, address):

1914

1404

try:

1915

1405

self.finish_request(request, address)

1916

except Exception:

1406

except:

1917

1407

self.handle_error(request, address)

1918

1408

self.close_request(request)

1919

1409

1920

1410

def process_request(self, request, address):

1921

1411

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

1922

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

1923

args = (request, address))

1924

proc.start()

1925

return proc

1926

1412

multiprocessing.Process(target = self.sub_process_main,

1413

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

1927

1414

1928

1415

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1929

1416

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

1930

1931

1417

def process_request(self, request, client_address):

1932

1418

"""Overrides and wraps the original process_request().

1933

1419

1934

1420

This function creates a new pipe in self.pipe

1935

1421

"""

1936

1422

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1937

1938

proc = MultiprocessingMixIn.process_request(self, request,

1939

client_address)

1423

1424

super(MultiprocessingMixInWithPipe,

1425

self).process_request(request, client_address)

1940

1426

self.child_pipe.close()

1941

self.add_pipe(parent_pipe, proc)

1942

1943

def add_pipe(self, parent_pipe, proc):

1427

self.add_pipe(parent_pipe)

1428

1429

def add_pipe(self, parent_pipe):

1944

1430

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

1945

raise NotImplementedError()

1946

1431

raise NotImplementedError

1947

1432

1948

1433

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1949

1434

socketserver.TCPServer, object):

1954

1439

interface: None or a network interface name (string)

1955

1440

use_ipv6: Boolean; to use IPv6 or not

1956

1441

"""

1957

1958

1442

def __init__(self, server_address, RequestHandlerClass,

1959

interface=None,

1960

use_ipv6=True,

1961

socketfd=None):

1962

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

1963

creating a new one with socket.socket().

1964

"""

1443

interface=None, use_ipv6=True):

1965

1444

self.interface = interface

1966

1445

if use_ipv6:

1967

1446

self.address_family = socket.AF_INET6

1968

if socketfd is not None:

1969

# Save the file descriptor

1970

self.socketfd = socketfd

1971

# Save the original socket.socket() function

1972

self.socket_socket = socket.socket

1973

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

1974

#

1975

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

1976

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

1977

# patching socket.socket.)

1978

#

1979

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

1980

@functools.wraps(socket.socket)

1981

def socket_wrapper(*args, **kwargs):

1982

# Restore original function so subsequent calls are

1983

# not affected.

1984

socket.socket = self.socket_socket

1985

del self.socket_socket

1986

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

1987

# saved file descriptor.

1988

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

1989

# Replace socket.socket() function with wrapper

1990

socket.socket = socket_wrapper

1991

# The socketserver.TCPServer.__init__ will call

1992

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

1993

# socket_wrapper(), if socketfd was set.

1994

1447

socketserver.TCPServer.__init__(self, server_address,

1995

1448

RequestHandlerClass)

1996

1997

1449

def server_bind(self):

1998

1450

"""This overrides the normal server_bind() function

1999

1451

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

2005

1457

self.interface)

2006

1458

else:

2007

1459

try:

2008

self.socket.setsockopt(

2009

socket.SOL_SOCKET, SO_BINDTODEVICE,

2010

(self.interface + "\0").encode("utf-8"))

1460

self.socket.setsockopt(socket.SOL_SOCKET,

1461

SO_BINDTODEVICE,

1462

str(self.interface

1463

+ '\0'))

2011

1464

except socket.error as error:

2012

if error.errno == errno.EPERM:

2013

logger.error("No permission to bind to"

2014

" interface %s", self.interface)

2015

elif error.errno == errno.ENOPROTOOPT:

1465

if error[0] == errno.EPERM:

1466

logger.error("No permission to"

1467

" bind to interface %s",

1468

self.interface)

1469

elif error[0] == errno.ENOPROTOOPT:

2016

1470

logger.error("SO_BINDTODEVICE not available;"

2017

1471

" cannot bind to interface %s",

2018

1472

self.interface)

2019

elif error.errno == errno.ENODEV:

2020

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

2021

" cannot bind", self.interface)

2022

1473

else:

2023

1474

raise

2024

1475

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

2027

1478

if self.address_family == socket.AF_INET6:

2028

1479

any_address = "::" # in6addr_any

2029

1480

else:

2030

any_address = "0.0.0.0" # INADDR_ANY

1481

any_address = socket.INADDR_ANY

2031

1482

self.server_address = (any_address,

2032

1483

self.server_address[1])

2033

1484

elif not self.server_address[1]:

2034

self.server_address = (self.server_address[0], 0)

1485

self.server_address = (self.server_address[0],

1486

0)

2035

1487

# if self.interface:

2036

1488

# self.server_address = (self.server_address[0],

2037

1489

# 0, # port

2051

1503

2052

1504

Assumes a gobject.MainLoop event loop.

2053

1505

"""

2054

2055

1506

def __init__(self, server_address, RequestHandlerClass,

2056

interface=None,

2057

use_ipv6=True,

2058

clients=None,

2059

gnutls_priority=None,

2060

use_dbus=True,

2061

socketfd=None):

1507

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

1508

gnutls_priority=None, use_dbus=True):

2062

1509

self.enabled = False

2063

1510

self.clients = clients

2064

1511

if self.clients is None:

2065

self.clients = {}

1512

self.clients = set()

2066

1513

self.use_dbus = use_dbus

2067

1514

self.gnutls_priority = gnutls_priority

2068

1515

IPv6_TCPServer.__init__(self, server_address,

2069

1516

RequestHandlerClass,

2070

1517

interface = interface,

2071

use_ipv6 = use_ipv6,

2072

socketfd = socketfd)

2073

1518

use_ipv6 = use_ipv6)

2074

1519

def server_activate(self):

2075

1520

if self.enabled:

2076

1521

return socketserver.TCPServer.server_activate(self)

2077

2078

1522

def enable(self):

2079

1523

self.enabled = True

2080

2081

def add_pipe(self, parent_pipe, proc):

1524

def add_pipe(self, parent_pipe):

2082

1525

# Call "handle_ipc" for both data and EOF events

2083

gobject.io_add_watch(

2084

parent_pipe.fileno(),

2085

gobject.IO_IN | gobject.IO_HUP,

2086

functools.partial(self.handle_ipc,

2087

parent_pipe = parent_pipe,

2088

proc = proc))

2089

2090

def handle_ipc(self, source, condition,

2091

parent_pipe=None,

2092

proc = None,

1526

gobject.io_add_watch(parent_pipe.fileno(),

1527

gobject.IO_IN | gobject.IO_HUP,

1528

functools.partial(self.handle_ipc,

1529

parent_pipe = parent_pipe))

1530

1531

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

2093

1532

client_object=None):

2094

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

2095

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

2096

# Wait for other process to exit

2097

proc.join()

1533

condition_names = {

1534

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

1535

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

1536

# blocking).

1537

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

1538

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

1539

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

1540

# broken, usually for pipes and

1541

# sockets).

1542

}

1543

conditions_string = ' | '.join(name

1544

for cond, name in

1545

condition_names.iteritems()

1546

if cond & condition)

1547

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

1548

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

2098

1549

return False

2099

1550

2100

1551

# Read a request from the child

2105

1556

fpr = request[1]

2106

1557

address = request[2]

2107

1558

2108

for c in self.clients.itervalues():

1559

for c in self.clients:

2109

1560

if c.fingerprint == fpr:

2110

1561

client = c

2111

1562

break

2112

1563

else:

2113

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

2114

"dress: %s", fpr, address)

1564

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

1565

"dress: %s", fpr, address)

2115

1566

if self.use_dbus:

2116

1567

# Emit D-Bus signal

2117

mandos_dbus_service.ClientNotFound(fpr,

2118

address[0])

1568

mandos_dbus_service.ClientNotFound(fpr, address[0])

2119

1569

parent_pipe.send(False)

2120

1570

return False

2121

1571

2122

gobject.io_add_watch(

2123

parent_pipe.fileno(),

2124

gobject.IO_IN | gobject.IO_HUP,

2125

functools.partial(self.handle_ipc,

2126

parent_pipe = parent_pipe,

2127

proc = proc,

2128

client_object = client))

1572

gobject.io_add_watch(parent_pipe.fileno(),

1573

gobject.IO_IN | gobject.IO_HUP,

1574

functools.partial(self.handle_ipc,

1575

parent_pipe = parent_pipe,

1576

client_object = client))

2129

1577

parent_pipe.send(True)

2130

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

2131

# same fileno

1578

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

2132

1579

return False

2133

1580

if command == 'funcall':

2134

1581

funcname = request[1]

2135

1582

args = request[2]

2136

1583

kwargs = request[3]

2137

1584

2138

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

2139

funcname)(*args,

2140

**kwargs)))

2141

1585

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

1586

2142

1587

if command == 'getattr':

2143

1588

attrname = request[1]

2144

1589

if callable(client_object.__getattribute__(attrname)):

2145

parent_pipe.send(('function', ))

1590

parent_pipe.send(('function',))

2146

1591

else:

2147

parent_pipe.send((

2148

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

1592

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

2149

1593

2150

1594

if command == 'setattr':

2151

1595

attrname = request[1]

2152

1596

value = request[2]

2153

1597

setattr(client_object, attrname, value)

2154

1598

2155

1599

return True

2156

1600

2157

1601

2158

def rfc3339_duration_to_delta(duration):

2159

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

2160

2161

>>> rfc3339_duration_to_delta("P7D")

2162

datetime.timedelta(7)

2163

>>> rfc3339_duration_to_delta("PT60S")

2164

datetime.timedelta(0, 60)

2165

>>> rfc3339_duration_to_delta("PT60M")

2166

datetime.timedelta(0, 3600)

2167

>>> rfc3339_duration_to_delta("PT24H")

2168

datetime.timedelta(1)

2169

>>> rfc3339_duration_to_delta("P1W")

2170

datetime.timedelta(7)

2171

>>> rfc3339_duration_to_delta("PT5M30S")

2172

datetime.timedelta(0, 330)

2173

>>> rfc3339_duration_to_delta("P1DT3M20S")

2174

datetime.timedelta(1, 200)

2175

"""

2176

2177

# Parsing an RFC 3339 duration with regular expressions is not

2178

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

2179

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

2180

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

2181

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

2182

# avoid excessive use of external libraries.

2183

2184

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

2185

Token = collections.namedtuple("Token", (

2186

"regexp", # To match token; if "value" is not None, must have

2187

# a "group" containing digits

2188

"value", # datetime.timedelta or None

2189

"followers")) # Tokens valid after this token

2190

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

2191

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

2192

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

2193

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

2194

datetime.timedelta(seconds=1),

2195

frozenset((token_end, )))

2196

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

2197

datetime.timedelta(minutes=1),

2198

frozenset((token_second, token_end)))

2199

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

2200

datetime.timedelta(hours=1),

2201

frozenset((token_minute, token_end)))

2202

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

2203

None,

2204

frozenset((token_hour, token_minute,

2205

token_second)))

2206

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

2207

datetime.timedelta(days=1),

2208

frozenset((token_time, token_end)))

2209

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

2210

datetime.timedelta(weeks=4),

2211

frozenset((token_day, token_end)))

2212

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

2213

datetime.timedelta(weeks=52),

2214

frozenset((token_month, token_end)))

2215

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

2216

datetime.timedelta(weeks=1),

2217

frozenset((token_end, )))

2218

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

2219

frozenset((token_year, token_month,

2220

token_day, token_time,

2221

token_week)))

2222

# Define starting values

2223

value = datetime.timedelta() # Value so far

2224

found_token = None

2225

followers = frozenset((token_duration, )) # Following valid tokens

2226

s = duration # String left to parse

2227

# Loop until end token is found

2228

while found_token is not token_end:

2229

# Search for any currently valid tokens

2230

for token in followers:

2231

match = token.regexp.match(s)

2232

if match is not None:

2233

# Token found

2234

if token.value is not None:

2235

# Value found, parse digits

2236

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

2237

# Add to value so far

2238

value += factor * token.value

2239

# Strip token from string

2240

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

2241

# Go to found token

2242

found_token = token

2243

# Set valid next tokens

2244

followers = found_token.followers

2245

break

2246

else:

2247

# No currently valid tokens were found

2248

raise ValueError("Invalid RFC 3339 duration: {!r}"

2249

.format(duration))

2250

# End token found

2251

return value

2252

2253

2254

1602

def string_to_delta(interval):

2255

1603

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

2256

1604

2267

1615

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

2268

1616

datetime.timedelta(0, 330)

2269

1617

"""

2270

2271

try:

2272

return rfc3339_duration_to_delta(interval)

2273

except ValueError:

2274

pass

2275

2276

1618

timevalue = datetime.timedelta(0)

2277

1619

for s in interval.split():

2278

1620

try:

2279

suffix = s[-1]

1621

suffix = unicode(s[-1])

2280

1622

value = int(s[:-1])

2281

1623

if suffix == "d":

2282

1624

delta = datetime.timedelta(value)

2289

1631

elif suffix == "w":

2290

1632

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

2291

1633

else:

2292

raise ValueError("Unknown suffix {!r}".format(suffix))

2293

except IndexError as e:

1634

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

1635

except (ValueError, IndexError) as e:

2294

1636

raise ValueError(*(e.args))

2295

1637

timevalue += delta

2296

1638

return timevalue

2297

1639

2298

1640

1641

def if_nametoindex(interface):

1642

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

1643

1644

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

1645

global if_nametoindex

1646

try:

1647

if_nametoindex = (ctypes.cdll.LoadLibrary

1648

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

1649

.if_nametoindex)

1650

except (OSError, AttributeError):

1651

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

1652

def if_nametoindex(interface):

1653

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

1654

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

1655

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

1656

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1657

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

1658

interface))

1659

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

1660

ifreq[16:20])[0]

1661

return interface_index

1662

return if_nametoindex(interface)

1663

1664

2299

1665

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

2300

1666

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

2301

1667

2309

1675

sys.exit()

2310

1676

if not noclose:

2311

1677

# Close all standard open file descriptors

2312

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

1678

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

2313

1679

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

2314

1680

raise OSError(errno.ENODEV,

2315

"{} not a character device"

2316

.format(os.devnull))

1681

"%s not a character device"

1682

% os.path.devnull)

2317

1683

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

2318

1684

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

2319

1685

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

2328

1694

2329

1695

parser = argparse.ArgumentParser()

2330

1696

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

2331

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

1697

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

2332

1698

help="show version number and exit")

2333

1699

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

2334

1700

help="Bind to interface IF")

2340

1706

help="Run self-test")

2341

1707

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

2342

1708

help="Debug mode; run in foreground and log"

2343

" to terminal", default=None)

1709

" to terminal")

2344

1710

parser.add_argument("--debuglevel", metavar="LEVEL",

2345

1711

help="Debug level for stdout output")

2346

1712

parser.add_argument("--priority", help="GnuTLS"

2353

1719

" files")

2354

1720

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

2355

1721

dest="use_dbus", help="Do not provide D-Bus"

2356

" system bus interface", default=None)

1722

" system bus interface")

2357

1723

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

2358

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

2359

default=None)

2360

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

2361

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

2362

" state", default=None)

2363

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

2364

help="Specify a file descriptor to a network"

2365

" socket to use instead of creating one")

2366

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

2367

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

2368

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

2369

help="Run in foreground", default=None)

2370

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

2371

dest="zeroconf", help="Do not use Zeroconf",

2372

default=None)

2373

1724

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

2374

1725

options = parser.parse_args()

2375

1726

2376

1727

if options.check:

2377

1728

import doctest

2378

fail_count, test_count = doctest.testmod()

2379

sys.exit(os.EX_OK if fail_count == 0 else 1)

1729

doctest.testmod()

1730

sys.exit()

2380

1731

2381

1732

# Default values for config file for server-global settings

2382

1733

server_defaults = { "interface": "",

2384

1735

"port": "",

2385

1736

"debug": "False",

2386

1737

"priority":

2387

"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:!RSA"

2388

":+SIGN-RSA-SHA224:+SIGN-RSA-RMD160",

1738

"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",

2389

1739

"servicename": "Mandos",

2390

1740

"use_dbus": "True",

2391

1741

"use_ipv6": "True",

2392

1742

"debuglevel": "",

2393

"restore": "True",

2394

"socket": "",

2395

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

2396

"foreground": "False",

2397

"zeroconf": "True",

2398

}

1743

}

2399

1744

2400

1745

# Parse config file for server-global settings

2401

1746

server_config = configparser.SafeConfigParser(server_defaults)

2402

1747

del server_defaults

2403

server_config.read(os.path.join(options.configdir, "mandos.conf"))

1748

server_config.read(os.path.join(options.configdir,

1749

"mandos.conf"))

2404

1750

# Convert the SafeConfigParser object to a dict

2405

1751

server_settings = server_config.defaults()

2406

1752

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

2407

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

1753

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

2408

1754

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

2409

1755

option)

2410

1756

if server_settings["port"]:

2411

1757

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

2412

1758

"port")

2413

if server_settings["socket"]:

2414

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

2415

"socket")

2416

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

2417

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

2418

# happen with a supplied network socket.

2419

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

2420

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

2421

["socket"])

2422

1759

del server_config

2423

1760

2424

1761

# Override the settings from the config file with command line

2425

1762

# options, if set.

2426

1763

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

2427

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

2428

"use_ipv6", "debuglevel", "restore", "statedir",

2429

"socket", "foreground", "zeroconf"):

1764

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

1765

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

2430

1766

value = getattr(options, option)

2431

1767

if value is not None:

2432

1768

server_settings[option] = value

2433

1769

del options

2434

1770

# Force all strings to be unicode

2435

1771

for option in server_settings.keys():

2436

if isinstance(server_settings[option], bytes):

2437

server_settings[option] = (server_settings[option]

2438

.decode("utf-8"))

2439

# Force all boolean options to be boolean

2440

for option in ("debug", "use_dbus", "use_ipv6", "restore",

2441

"foreground", "zeroconf"):

2442

server_settings[option] = bool(server_settings[option])

2443

# Debug implies foreground

2444

if server_settings["debug"]:

2445

server_settings["foreground"] = True

1772

if type(server_settings[option]) is str:

1773

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

2446

1774

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

2447

1775

2448

1776

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

2449

1777

2450

if (not server_settings["zeroconf"]

2451

and not (server_settings["port"]

2452

or server_settings["socket"] != "")):

2453

parser.error("Needs port or socket to work without Zeroconf")

2454

2455

1778

# For convenience

2456

1779

debug = server_settings["debug"]

2457

1780

debuglevel = server_settings["debuglevel"]

2458

1781

use_dbus = server_settings["use_dbus"]

2459

1782

use_ipv6 = server_settings["use_ipv6"]

2460

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

2461

stored_state_file)

2462

foreground = server_settings["foreground"]

2463

zeroconf = server_settings["zeroconf"]

2464

2465

if debug:

2466

initlogger(debug, logging.DEBUG)

2467

else:

2468

if not debuglevel:

2469

initlogger(debug)

2470

else:

2471

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

2472

initlogger(debug, level)

2473

1783

2474

1784

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

2475

syslogger.setFormatter(

2476

logging.Formatter('Mandos ({}) [%(process)d]:'

2477

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

2478

server_settings["servicename"])))

1785

syslogger.setFormatter(logging.Formatter

1786

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

1787

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

1788

% server_settings["servicename"]))

2479

1789

2480

1790

# Parse config file with clients

2481

client_config = configparser.SafeConfigParser(Client

2482

.client_defaults)

1791

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

1792

"interval": "5m",

1793

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

1794

"host": "",

1795

"approval_delay": "0s",

1796

"approval_duration": "1s",

1797

}

1798

client_config = configparser.SafeConfigParser(client_defaults)

2483

1799

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

2484

1800

"clients.conf"))

2485

1801

2486

1802

global mandos_dbus_service

2487

1803

mandos_dbus_service = None

2488

1804

2489

socketfd = None

2490

if server_settings["socket"] != "":

2491

socketfd = server_settings["socket"]

2492

tcp_server = MandosServer(

2493

(server_settings["address"], server_settings["port"]),

2494

ClientHandler,

2495

interface=(server_settings["interface"] or None),

2496

use_ipv6=use_ipv6,

2497

gnutls_priority=server_settings["priority"],

2498

use_dbus=use_dbus,

2499

socketfd=socketfd)

2500

if not foreground:

2501

pidfilename = "/run/mandos.pid"

2502

if not os.path.isdir("/run/."):

2503

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

2504

pidfile = None

1805

tcp_server = MandosServer((server_settings["address"],

1806

server_settings["port"]),

1807

ClientHandler,

1808

interface=(server_settings["interface"]

1809

or None),

1810

use_ipv6=use_ipv6,

1811

gnutls_priority=

1812

server_settings["priority"],

1813

use_dbus=use_dbus)

1814

if not debug:

1815

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

2505

1816

try:

2506

pidfile = codecs.open(pidfilename, "w", encoding="utf-8")

2507

except IOError as e:

2508

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

2509

exc_info=e)

1817

pidfile = open(pidfilename, "w")

1818

except IOError:

1819

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

2510

1820

2511

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

1821

try:

1822

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

1823

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

1824

except KeyError:

2512

1825

try:

2513

uid = pwd.getpwnam(name).pw_uid

2514

gid = pwd.getpwnam(name).pw_gid

2515

break

1826

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

1827

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

2516

1828

except KeyError:

2517

continue

2518

else:

2519

uid = 65534

2520

gid = 65534

1829

try:

1830

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

1831

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

1832

except KeyError:

1833

uid = 65534

1834

gid = 65534

2521

1835

try:

2522

1836

os.setgid(gid)

2523

1837

os.setuid(uid)

2524

1838

except OSError as error:

2525

if error.errno != errno.EPERM:

2526

raise

1839

if error[0] != errno.EPERM:

1840

raise error

2527

1841

1842

if not debug and not debuglevel:

1843

syslogger.setLevel(logging.WARNING)

1844

console.setLevel(logging.WARNING)

1845

if debuglevel:

1846

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

1847

syslogger.setLevel(level)

1848

console.setLevel(level)

1849

2528

1850

if debug:

2529

1851

# Enable all possible GnuTLS debugging

2530

1852

2536

1858

def debug_gnutls(level, string):

2537

1859

logger.debug("GnuTLS: %s", string[:-1])

2538

1860

2539

gnutls.library.functions.gnutls_global_set_log_function(

2540

debug_gnutls)

1861

(gnutls.library.functions

1862

.gnutls_global_set_log_function(debug_gnutls))

2541

1863

2542

1864

# Redirect stdin so all checkers get /dev/null

2543

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

1865

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

2544

1866

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

2545

1867

if null > 2:

2546

1868

os.close(null)

1869

else:

1870

# No console logging

1871

logger.removeHandler(console)

2547

1872

2548

1873

# Need to fork before connecting to D-Bus

2549

if not foreground:

1874

if not debug:

2550

1875

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

2551

1876

daemon()

2552

1877

2553

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

2554

# need to inform gobject that threads will be used.

2555

gobject.threads_init()

2556

2557

1878

global main_loop

2558

1879

# From the Avahi example code

2559

DBusGMainLoop(set_as_default=True)

1880

DBusGMainLoop(set_as_default=True )

2560

1881

main_loop = gobject.MainLoop()

2561

1882

bus = dbus.SystemBus()

2562

1883

# End of Avahi example code

2563

1884

if use_dbus:

2564

1885

try:

2565

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

2566

bus,

2567

do_not_queue=True)

2568

old_bus_name = dbus.service.BusName(

2569

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

2570

do_not_queue=True)

2571

except dbus.exceptions.DBusException as e:

2572

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

1886

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

1887

bus, do_not_queue=True)

1888

except dbus.exceptions.NameExistsException as e:

1889

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

2573

1890

use_dbus = False

2574

1891

server_settings["use_dbus"] = False

2575

1892

tcp_server.use_dbus = False

2576

if zeroconf:

2577

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2578

service = AvahiServiceToSyslog(

2579

name = server_settings["servicename"],

2580

servicetype = "_mandos._tcp",

2581

protocol = protocol,

2582

bus = bus)

2583

if server_settings["interface"]:

2584

service.interface = if_nametoindex(

2585

server_settings["interface"].encode("utf-8"))

1893

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

1894

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

1895

servicetype = "_mandos._tcp",

1896

protocol = protocol, bus = bus)

1897

if server_settings["interface"]:

1898

service.interface = (if_nametoindex

1899

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

2586

1900

2587

1901

global multiprocessing_manager

2588

1902

multiprocessing_manager = multiprocessing.Manager()

2590

1904

client_class = Client

2591

1905

if use_dbus:

2592

1906

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

2593

2594

client_settings = Client.config_parser(client_config)

2595

old_client_settings = {}

2596

clients_data = {}

2597

2598

# This is used to redirect stdout and stderr for checker processes

2599

global wnull

2600

wnull = open(os.devnull, "w") # A writable /dev/null

2601

# Only used if server is running in foreground but not in debug

2602

# mode

2603

if debug or not foreground:

2604

wnull.close()

2605

2606

# Get client data and settings from last running state.

2607

if server_settings["restore"]:

2608

try:

2609

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

2610

clients_data, old_client_settings = pickle.load(

2611

stored_state)

2612

os.remove(stored_state_path)

2613

except IOError as e:

2614

if e.errno == errno.ENOENT:

2615

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

2616

" {}".format(os.strerror(e.errno)))

2617

else:

2618

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

2619

exc_info=e)

2620

raise

2621

except EOFError as e:

2622

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

2623

"EOFError:",

2624

exc_info=e)

2625

2626

with PGPEngine() as pgp:

2627

for client_name, client in clients_data.items():

2628

# Skip removed clients

2629

if client_name not in client_settings:

2630

continue

2631

2632

# Decide which value to use after restoring saved state.

2633

# We have three different values: Old config file,

2634

# new config file, and saved state.

2635

# New config value takes precedence if it differs from old

2636

# config value, otherwise use saved state.

2637

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

2638

try:

2639

# For each value in new config, check if it

2640

# differs from the old config value (Except for

2641

# the "secret" attribute)

2642

if (name != "secret"

2643

and (value !=

2644

old_client_settings[client_name][name])):

2645

client[name] = value

2646

except KeyError:

2647

pass

2648

2649

# Clients who has passed its expire date can still be

2650

# enabled if its last checker was successful. Clients

2651

# whose checker succeeded before we stored its state is

2652

# assumed to have successfully run all checkers during

2653

# downtime.

2654

if client["enabled"]:

2655

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

2656

if not client["last_checked_ok"]:

2657

logger.warning(

2658

"disabling client {} - Client never "

2659

"performed a successful checker".format(

2660

client_name))

2661

client["enabled"] = False

2662

elif client["last_checker_status"] != 0:

2663

logger.warning(

2664

"disabling client {} - Client last"

2665

" checker failed with error code"

2666

" {}".format(

2667

client_name,

2668

client["last_checker_status"]))

2669

client["enabled"] = False

2670

else:

2671

client["expires"] = (

2672

datetime.datetime.utcnow()

2673

+ client["timeout"])

2674

logger.debug("Last checker succeeded,"

2675

" keeping {} enabled".format(

2676

client_name))

1907

def client_config_items(config, section):

1908

special_settings = {

1909

"approved_by_default":

1910

lambda: config.getboolean(section,

1911

"approved_by_default"),

1912

}

1913

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

2677

1914

try:

2678

client["secret"] = pgp.decrypt(

2679

client["encrypted_secret"],

2680

client_settings[client_name]["secret"])

2681

except PGPError:

2682

# If decryption fails, we use secret from new settings

2683

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

2684

client_name))

2685

client["secret"] = (client_settings[client_name]

2686

["secret"])

2687

2688

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

2689

for client_name in (set(old_client_settings)

2690

- set(client_settings)):

2691

del clients_data[client_name]

2692

for client_name in (set(client_settings)

2693

- set(old_client_settings)):

2694

clients_data[client_name] = client_settings[client_name]

2695

2696

# Create all client objects

2697

for client_name, client in clients_data.items():

2698

tcp_server.clients[client_name] = client_class(

2699

name = client_name,

2700

settings = client,

2701

server_settings = server_settings)

2702

1915

yield (name, special_settings[name]())

1916

except KeyError:

1917

yield (name, value)

1918

1919

tcp_server.clients.update(set(

1920

client_class(name = section,

1921

config= dict(client_config_items(

1922

client_config, section)))

1923

for section in client_config.sections()))

2703

1924

if not tcp_server.clients:

2704

1925

logger.warning("No clients defined")

2705

2706

if not foreground:

2707

if pidfile is not None:

2708

pid = os.getpid()

2709

try:

2710

with pidfile:

2711

print(pid, file=pidfile)

2712

except IOError:

2713

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

2714

pidfilename, pid)

2715

del pidfile

1926

1927

if not debug:

1928

try:

1929

with pidfile:

1930

pid = os.getpid()

1931

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

1932

del pidfile

1933

except IOError:

1934

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

1935

pidfilename, pid)

1936

except NameError:

1937

# "pidfile" was never created

1938

pass

2716

1939

del pidfilename

2717

1940

1941

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

1942

2718

1943

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

2719

1944

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

2720

1945

2721

1946

if use_dbus:

2722

2723

@alternate_dbus_interfaces(

2724

{ "se.recompile.Mandos": "se.bsnet.fukt.Mandos" })

2725

class MandosDBusService(DBusObjectWithProperties):

1947

class MandosDBusService(dbus.service.Object):

2726

1948

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

2727

2728

1949

def __init__(self):

2729

1950

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

2730

2731

_interface = "se.recompile.Mandos"

2732

2733

@dbus_interface_annotations(_interface)

2734

def _foo(self):

2735

return {

2736

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

2737

"false" }

1951

_interface = "se.bsnet.fukt.Mandos"

2738

1952

2739

1953

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

2740

1954

def ClientAdded(self, objpath):

2754

1968

@dbus.service.method(_interface, out_signature="ao")

2755

1969

def GetAllClients(self):

2756

1970

"D-Bus method"

2757

return dbus.Array(c.dbus_object_path for c in

2758

tcp_server.clients.itervalues())

1971

return dbus.Array(c.dbus_object_path

1972

for c in tcp_server.clients)

2759

1973

2760

1974

@dbus.service.method(_interface,

2761

1975

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

2762

1976

def GetAllClientsWithProperties(self):

2763

1977

"D-Bus method"

2764

1978

return dbus.Dictionary(

2765

{ c.dbus_object_path: c.GetAll("")

2766

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

1979

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

1980

for c in tcp_server.clients),

2767

1981

signature="oa{sv}")

2768

1982

2769

1983

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

2770

1984

def RemoveClient(self, object_path):

2771

1985

"D-Bus method"

2772

for c in tcp_server.clients.itervalues():

1986

for c in tcp_server.clients:

2773

1987

if c.dbus_object_path == object_path:

2774

del tcp_server.clients[c.name]

1988

tcp_server.clients.remove(c)

2775

1989

c.remove_from_connection()

2776

1990

# Don't signal anything except ClientRemoved

2777

1991

c.disable(quiet=True)

2786

2000

2787

2001

def cleanup():

2788

2002

"Cleanup function; run on exit"

2789

if zeroconf:

2790

service.cleanup()

2791

2792

multiprocessing.active_children()

2793

wnull.close()

2794

if not (tcp_server.clients or client_settings):

2795

return

2796

2797

# Store client before exiting. Secrets are encrypted with key

2798

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

2799

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

2800

clients = {}

2801

with PGPEngine() as pgp:

2802

for client in tcp_server.clients.itervalues():

2803

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

2804

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

2805

key)

2806

client_dict = {}

2807

2808

# A list of attributes that can not be pickled

2809

# + secret.

2810

exclude = { "bus", "changedstate", "secret",

2811

"checker", "server_settings" }

2812

for name, typ in inspect.getmembers(dbus.service

2813

.Object):

2814

exclude.add(name)

2815

2816

client_dict["encrypted_secret"] = (client

2817

.encrypted_secret)

2818

for attr in client.client_structure:

2819

if attr not in exclude:

2820

client_dict[attr] = getattr(client, attr)

2821

2822

clients[client.name] = client_dict

2823

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

2824

2825

try:

2826

with tempfile.NamedTemporaryFile(

2827

mode='wb',

2828

suffix=".pickle",

2829

prefix='clients-',

2830

dir=os.path.dirname(stored_state_path),

2831

delete=False) as stored_state:

2832

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

2833

tempname = stored_state.name

2834

os.rename(tempname, stored_state_path)

2835

except (IOError, OSError) as e:

2836

if not debug:

2837

try:

2838

os.remove(tempname)

2839

except NameError:

2840

pass

2841

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

2842

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

2843

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

2844

else:

2845

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

2846

exc_info=e)

2847

raise

2848

2849

# Delete all clients, and settings from config

2003

service.cleanup()

2004

2850

2005

while tcp_server.clients:

2851

name, client = tcp_server.clients.popitem()

2006

client = tcp_server.clients.pop()

2852

2007

if use_dbus:

2853

2008

client.remove_from_connection()

2009

client.disable_hook = None

2854

2010

# Don't signal anything except ClientRemoved

2855

2011

client.disable(quiet=True)

2856

2012

if use_dbus:

2857

2013

# Emit D-Bus signal

2858

mandos_dbus_service.ClientRemoved(

2859

client.dbus_object_path, client.name)

2860

client_settings.clear()

2014

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2015

client.name)

2861

2016

2862

2017

atexit.register(cleanup)

2863

2018

2864

for client in tcp_server.clients.itervalues():

2019

for client in tcp_server.clients:

2865

2020

if use_dbus:

2866

2021

# Emit D-Bus signal

2867

2022

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2868

# Need to initiate checking of clients

2869

if client.enabled:

2870

client.init_checker()

2023

client.enable()

2871

2024

2872

2025

tcp_server.enable()

2873

2026

tcp_server.server_activate()

2874

2027

2875

2028

# Find out what port we got

2876

if zeroconf:

2877

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

2029

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

2878

2030

if use_ipv6:

2879

2031

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

2880

" flowinfo %d, scope_id %d",

2881

*tcp_server.socket.getsockname())

2032

" flowinfo %d, scope_id %d"

2033

% tcp_server.socket.getsockname())

2882

2034

else: # IPv4

2883

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

2884

*tcp_server.socket.getsockname())

2035

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

2036

% tcp_server.socket.getsockname())

2885

2037

2886

2038

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

2887

2039

2888

2040

try:

2889

if zeroconf:

2890

# From the Avahi example code

2891

try:

2892

service.activate()

2893

except dbus.exceptions.DBusException as error:

2894

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

2895

cleanup()

2896

sys.exit(1)

2897

# End of Avahi example code

2041

# From the Avahi example code

2042

try:

2043

service.activate()

2044

except dbus.exceptions.DBusException as error:

2045

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

2046

cleanup()

2047

sys.exit(1)

2048

# End of Avahi example code

2898

2049

2899

2050

gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,

2900

2051

lambda *args, **kwargs:

2904

2055

logger.debug("Starting main loop")

2905

2056

main_loop.run()

2906

2057

except AvahiError as error:

2907

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

2058

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

2908

2059

cleanup()

2909

2060

sys.exit(1)

2910

2061

except KeyboardInterrupt:

2915

2066

# Must run before the D-Bus bus name gets deregistered

2916

2067

cleanup()

2917

2068

2918

2919

2069

if __name__ == '__main__':

2920

2070

main()