/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 errno

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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 gnutls.crypto

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import gnutls.connection

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import gnutls.errors

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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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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 = "1.7.1"

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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"""

295

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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:

310

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"""

179

if self.group is not None:

180

try:

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self.group.Free()

182

except (dbus.exceptions.UnknownMethodException,

183

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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191

self.remove()

330

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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208

dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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210

self.group.Commit()

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350

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def entry_group_state_changed(self, state, error):

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212

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

352

213

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

358

219

self.rename()

359

220

elif state == avahi.ENTRY_GROUP_FAILURE:

360

221

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

361

str(error))

362

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

363

222

unicode(error))

223

raise AvahiGroupError("State changed: %s"

224

% unicode(error))

364

225

def cleanup(self):

365

226

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

366

if self.group is not None:

367

try:

368

self.group.Free()

369

except (dbus.exceptions.UnknownMethodException,

370

dbus.exceptions.DBusException):

371

pass

372

self.group = None

373

227

self.remove()

374

375

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

376

229

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

377

230

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

378

bad_states = {

379

avahi.SERVER_INVALID: "Zeroconf server invalid",

380

avahi.SERVER_REGISTERING: None,

381

avahi.SERVER_COLLISION: "Zeroconf server name collision",

382

avahi.SERVER_FAILURE: "Zeroconf server failure",

383

}

231

bad_states = { avahi.SERVER_INVALID:

232

"Zeroconf server invalid",

233

avahi.SERVER_REGISTERING: None,

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avahi.SERVER_COLLISION:

235

"Zeroconf server name collision",

236

avahi.SERVER_FAILURE:

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"Zeroconf server failure" }

384

238

if state in bad_states:

385

if bad_states[state] is not None:

386

if error is None:

387

logger.error(bad_states[state])

388

else:

389

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

390

self.cleanup()

239

if bad_states[state]:

240

logger.error(bad_states[state])

241

self.remove()

391

242

elif state == avahi.SERVER_RUNNING:

392

try:

393

self.add()

394

except dbus.exceptions.DBusException as error:

395

if (error.get_dbus_name()

396

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

397

logger.info("Local Zeroconf service name"

398

" collision.")

399

return self.rename(remove=False)

400

else:

401

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

402

self.cleanup()

403

os._exit(1)

243

self.add()

404

244

else:

405

if error is None:

406

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

407

else:

408

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

409

245

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

410

246

def activate(self):

411

247

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

412

248

if self.server is None:

416

252

follow_name_owner_changes=True),

417

253

avahi.DBUS_INTERFACE_SERVER)

418

254

self.server.connect_to_signal("StateChanged",

419

self.server_state_changed)

255

self.server_state_changed)

420

256

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

421

257

422

258

423

class AvahiServiceToSyslog(AvahiService):

424

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

425

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

426

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

427

syslogger.setFormatter(logging.Formatter(

428

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

429

.format(self.name)))

430

return ret

431

432

# Pretend that we have a GnuTLS module

433

class GnuTLS(object):

434

"""This isn't so much a class as it is a module-like namespace.

435

It is instantiated once, and simulates having a GnuTLS module."""

436

437

_library = ctypes.cdll.LoadLibrary(

438

ctypes.util.find_library("gnutls"))

439

_need_version = "3.3.0"

440

def __init__(self):

441

# Need to use class name "GnuTLS" here, since this method is

442

# called before the assignment to the "gnutls" global variable

443

# happens.

444

if GnuTLS.check_version(self._need_version) is None:

445

raise GnuTLS.Error("Needs GnuTLS {} or later"

446

.format(self._need_version))

447

448

# Unless otherwise indicated, the constants and types below are

449

# all from the gnutls/gnutls.h C header file.

450

451

# Constants

452

E_SUCCESS = 0

453

E_INTERRUPTED = -52

454

E_AGAIN = -28

455

CRT_OPENPGP = 2

456

CLIENT = 2

457

SHUT_RDWR = 0

458

CRD_CERTIFICATE = 1

459

E_NO_CERTIFICATE_FOUND = -49

460

OPENPGP_FMT_RAW = 0 # gnutls/openpgp.h

461

462

# Types

463

class session_int(ctypes.Structure):

464

_fields_ = []

465

session_t = ctypes.POINTER(session_int)

466

class certificate_credentials_st(ctypes.Structure):

467

_fields_ = []

468

certificate_credentials_t = ctypes.POINTER(

469

certificate_credentials_st)

470

certificate_type_t = ctypes.c_int

471

class datum_t(ctypes.Structure):

472

_fields_ = [('data', ctypes.POINTER(ctypes.c_ubyte)),

473

('size', ctypes.c_uint)]

474

class openpgp_crt_int(ctypes.Structure):

475

_fields_ = []

476

openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)

477

openpgp_crt_fmt_t = ctypes.c_int # gnutls/openpgp.h

478

log_func = ctypes.CFUNCTYPE(None, ctypes.c_int, ctypes.c_char_p)

479

credentials_type_t = ctypes.c_int #

480

transport_ptr_t = ctypes.c_void_p

481

close_request_t = ctypes.c_int

482

483

# Exceptions

484

class Error(Exception):

485

# We need to use the class name "GnuTLS" here, since this

486

# exception might be raised from within GnuTLS.__init__,

487

# which is called before the assignment to the "gnutls"

488

# global variable has happened.

489

def __init__(self, message = None, code = None, args=()):

490

# Default usage is by a message string, but if a return

491

# code is passed, convert it to a string with

492

# gnutls.strerror()

493

self.code = code

494

if message is None and code is not None:

495

message = GnuTLS.strerror(code)

496

return super(GnuTLS.Error, self).__init__(

497

message, *args)

498

499

class CertificateSecurityError(Error):

500

pass

501

502

# Classes

503

class Credentials(object):

504

def __init__(self):

505

self._c_object = gnutls.certificate_credentials_t()

506

gnutls.certificate_allocate_credentials(

507

ctypes.byref(self._c_object))

508

self.type = gnutls.CRD_CERTIFICATE

509

510

def __del__(self):

511

gnutls.certificate_free_credentials(self._c_object)

512

513

class ClientSession(object):

514

def __init__(self, socket, credentials = None):

515

self._c_object = gnutls.session_t()

516

gnutls.init(ctypes.byref(self._c_object), gnutls.CLIENT)

517

gnutls.set_default_priority(self._c_object)

518

gnutls.transport_set_ptr(self._c_object, socket.fileno())

519

gnutls.handshake_set_private_extensions(self._c_object,

520

True)

521

self.socket = socket

522

if credentials is None:

523

credentials = gnutls.Credentials()

524

gnutls.credentials_set(self._c_object, credentials.type,

525

ctypes.cast(credentials._c_object,

526

ctypes.c_void_p))

527

self.credentials = credentials

528

529

def __del__(self):

530

gnutls.deinit(self._c_object)

531

532

def handshake(self):

533

return gnutls.handshake(self._c_object)

534

535

def send(self, data):

536

data = bytes(data)

537

data_len = len(data)

538

while data_len > 0:

539

data_len -= gnutls.record_send(self._c_object,

540

data[-data_len:],

541

data_len)

542

543

def bye(self):

544

return gnutls.bye(self._c_object, gnutls.SHUT_RDWR)

545

546

# Error handling functions

547

def _error_code(result):

548

"""A function to raise exceptions on errors, suitable

549

for the 'restype' attribute on ctypes functions"""

550

if result >= 0:

551

return result

552

if result == gnutls.E_NO_CERTIFICATE_FOUND:

553

raise gnutls.CertificateSecurityError(code = result)

554

raise gnutls.Error(code = result)

555

556

def _retry_on_error(result, func, arguments):

557

"""A function to retry on some errors, suitable

558

for the 'errcheck' attribute on ctypes functions"""

559

while result < 0:

560

if result not in (gnutls.E_INTERRUPTED, gnutls.E_AGAIN):

561

return _error_code(result)

562

result = func(*arguments)

563

return result

564

565

# Unless otherwise indicated, the function declarations below are

566

# all from the gnutls/gnutls.h C header file.

567

568

# Functions

569

priority_set_direct = _library.gnutls_priority_set_direct

570

priority_set_direct.argtypes = [session_t, ctypes.c_char_p,

571

ctypes.POINTER(ctypes.c_char_p)]

572

priority_set_direct.restype = _error_code

573

574

init = _library.gnutls_init

575

init.argtypes = [ctypes.POINTER(session_t), ctypes.c_int]

576

init.restype = _error_code

577

578

set_default_priority = _library.gnutls_set_default_priority

579

set_default_priority.argtypes = [session_t]

580

set_default_priority.restype = _error_code

581

582

record_send = _library.gnutls_record_send

583

record_send.argtypes = [session_t, ctypes.c_void_p,

584

ctypes.c_size_t]

585

record_send.restype = ctypes.c_ssize_t

586

record_send.errcheck = _retry_on_error

587

588

certificate_allocate_credentials = (

589

_library.gnutls_certificate_allocate_credentials)

590

certificate_allocate_credentials.argtypes = [

591

ctypes.POINTER(certificate_credentials_t)]

592

certificate_allocate_credentials.restype = _error_code

593

594

certificate_free_credentials = (

595

_library.gnutls_certificate_free_credentials)

596

certificate_free_credentials.argtypes = [certificate_credentials_t]

597

certificate_free_credentials.restype = None

598

599

handshake_set_private_extensions = (

600

_library.gnutls_handshake_set_private_extensions)

601

handshake_set_private_extensions.argtypes = [session_t,

602

ctypes.c_int]

603

handshake_set_private_extensions.restype = None

604

605

credentials_set = _library.gnutls_credentials_set

606

credentials_set.argtypes = [session_t, credentials_type_t,

607

ctypes.c_void_p]

608

credentials_set.restype = _error_code

609

610

strerror = _library.gnutls_strerror

611

strerror.argtypes = [ctypes.c_int]

612

strerror.restype = ctypes.c_char_p

613

614

certificate_type_get = _library.gnutls_certificate_type_get

615

certificate_type_get.argtypes = [session_t]

616

certificate_type_get.restype = _error_code

617

618

certificate_get_peers = _library.gnutls_certificate_get_peers

619

certificate_get_peers.argtypes = [session_t,

620

ctypes.POINTER(ctypes.c_uint)]

621

certificate_get_peers.restype = ctypes.POINTER(datum_t)

622

623

global_set_log_level = _library.gnutls_global_set_log_level

624

global_set_log_level.argtypes = [ctypes.c_int]

625

global_set_log_level.restype = None

626

627

global_set_log_function = _library.gnutls_global_set_log_function

628

global_set_log_function.argtypes = [log_func]

629

global_set_log_function.restype = None

630

631

deinit = _library.gnutls_deinit

632

deinit.argtypes = [session_t]

633

deinit.restype = None

634

635

handshake = _library.gnutls_handshake

636

handshake.argtypes = [session_t]

637

handshake.restype = _error_code

638

handshake.errcheck = _retry_on_error

639

640

transport_set_ptr = _library.gnutls_transport_set_ptr

641

transport_set_ptr.argtypes = [session_t, transport_ptr_t]

642

transport_set_ptr.restype = None

643

644

bye = _library.gnutls_bye

645

bye.argtypes = [session_t, close_request_t]

646

bye.restype = _error_code

647

bye.errcheck = _retry_on_error

648

649

check_version = _library.gnutls_check_version

650

check_version.argtypes = [ctypes.c_char_p]

651

check_version.restype = ctypes.c_char_p

652

653

# All the function declarations below are from gnutls/openpgp.h

654

655

openpgp_crt_init = _library.gnutls_openpgp_crt_init

656

openpgp_crt_init.argtypes = [ctypes.POINTER(openpgp_crt_t)]

657

openpgp_crt_init.restype = _error_code

658

659

openpgp_crt_import = _library.gnutls_openpgp_crt_import

660

openpgp_crt_import.argtypes = [openpgp_crt_t,

661

ctypes.POINTER(datum_t),

662

openpgp_crt_fmt_t]

663

openpgp_crt_import.restype = _error_code

664

665

openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self

666

openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,

667

ctypes.POINTER(ctypes.c_uint)]

668

openpgp_crt_verify_self.restype = _error_code

669

670

openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit

671

openpgp_crt_deinit.argtypes = [openpgp_crt_t]

672

openpgp_crt_deinit.restype = None

673

674

openpgp_crt_get_fingerprint = (

675

_library.gnutls_openpgp_crt_get_fingerprint)

676

openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,

677

ctypes.c_void_p,

678

ctypes.POINTER(

679

ctypes.c_size_t)]

680

openpgp_crt_get_fingerprint.restype = _error_code

681

682

# Remove non-public functions

683

del _error_code, _retry_on_error

684

# Create the global "gnutls" object, simulating a module

685

gnutls = GnuTLS()

686

687

def call_pipe(connection, # : multiprocessing.Connection

688

func, *args, **kwargs):

689

"""This function is meant to be called by multiprocessing.Process

690

691

This function runs func(*args, **kwargs), and writes the resulting

692

return value on the provided multiprocessing.Connection.

693

"""

694

connection.send(func(*args, **kwargs))

695

connection.close()

696

697

259

class Client(object):

698

260

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

699

261

700

262

Attributes:

701

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

263

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

702

264

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

703

265

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

704

266

checker: subprocess.Popen(); a running checker process used

711

273

instance %(name)s can be used in the command.

712

274

checker_initiator_tag: a gobject event source tag, or None

713

275

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

714

client_structure: Object describing what attributes a client has

715

and is used for storing the client at exit

716

276

current_checker_command: string; current running checker_command

277

disable_hook: If set, called by disable() as disable_hook(self)

717

278

disable_initiator_tag: a gobject event source tag, or None

718

279

enabled: bool()

719

280

fingerprint: string (40 or 32 hexadecimal digits); used to

722

283

interval: datetime.timedelta(); How often to start a new checker

723

284

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

724

285

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

725

last_checker_status: integer between 0 and 255 reflecting exit

726

status of last checker. -1 reflects crashed

727

checker, -2 means no checker completed yet.

728

last_checker_signal: The signal which killed the last checker, if

729

last_checker_status is -1

730

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

286

last_enabled: datetime.datetime(); (UTC)

731

287

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

732

288

D-Bus identifiers

733

289

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

734

290

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

735

291

until this client is disabled

736

extended_timeout: extra long timeout when secret has been sent

737

292

runtime_expansions: Allowed attributes for runtime expansion.

738

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

739

disabled, or None

740

server_settings: The server_settings dict from main()

741

293

"""

742

294

743

295

runtime_expansions = ("approval_delay", "approval_duration",

744

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

745

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

746

"last_approval_request", "last_checked_ok",

296

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

297

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

747

298

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

748

client_defaults = {

749

"timeout": "PT5M",

750

"extended_timeout": "PT15M",

751

"interval": "PT2M",

752

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

753

"host": "",

754

"approval_delay": "PT0S",

755

"approval_duration": "PT1S",

756

"approved_by_default": "True",

757

"enabled": "True",

758

}

759

299

760

300

@staticmethod

761

def config_parser(config):

762

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

763

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

764

with exceptions for any special settings as defined above.

765

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

766

value given the same arguments.

767

"""

768

settings = {}

769

for client_name in config.sections():

770

section = dict(config.items(client_name))

771

client = settings[client_name] = {}

772

773

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

774

# Reformat values from string types to Python types

775

client["approved_by_default"] = config.getboolean(

776

client_name, "approved_by_default")

777

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

778

"enabled")

779

780

# Uppercase and remove spaces from fingerprint for later

781

# comparison purposes with return value from the

782

# fingerprint() function

783

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

784

.replace(" ", ""))

785

if "secret" in section:

786

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

787

elif "secfile" in section:

788

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

789

(section["secfile"])),

790

"rb") as secfile:

791

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

792

else:

793

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

794

.format(section))

795

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

796

client["extended_timeout"] = string_to_delta(

797

section["extended_timeout"])

798

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

799

client["approval_delay"] = string_to_delta(

800

section["approval_delay"])

801

client["approval_duration"] = string_to_delta(

802

section["approval_duration"])

803

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

804

client["last_approval_request"] = None

805

client["last_checked_ok"] = None

806

client["last_checker_status"] = -2

807

808

return settings

809

810

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."""

811

322

self.name = name

812

if server_settings is None:

813

server_settings = {}

814

self.server_settings = server_settings

815

# adding all client settings

816

for setting, value in settings.items():

817

setattr(self, setting, value)

818

819

if self.enabled:

820

if not hasattr(self, "last_enabled"):

821

self.last_enabled = datetime.datetime.utcnow()

822

if not hasattr(self, "expires"):

823

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

824

+ self.timeout)

825

else:

826

self.last_enabled = None

827

self.expires = None

828

323

if config is None:

324

config = {}

829

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(" ", ""))

830

331

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

831

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

832

datetime.datetime.utcnow())

833

834

# 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

835

351

self.checker = None

836

352

self.checker_initiator_tag = None

837

353

self.disable_initiator_tag = None

838

354

self.checker_callback_tag = None

355

self.checker_command = config["checker"]

839

356

self.current_checker_command = None

840

self.approved = None

357

self.last_connect = None

358

self._approved = None

359

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

360

True)

841

361

self.approvals_pending = 0

842

self.changedstate = multiprocessing_manager.Condition(

843

multiprocessing_manager.Lock())

844

self.client_structure = [attr

845

for attr in self.__dict__.iterkeys()

846

if not attr.startswith("_")]

847

self.client_structure.append("client_structure")

848

849

for name, t in inspect.getmembers(

850

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

851

if not name.startswith("_"):

852

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())

853

367

854

# Send notice to process children that client state has changed

855

368

def send_changedstate(self):

856

with self.changedstate:

857

self.changedstate.notify_all()

858

369

self.changedstate.acquire()

370

self.changedstate.notify_all()

371

self.changedstate.release()

372

859

373

def enable(self):

860

374

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

861

375

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

862

376

# Already enabled

863

377

return

864

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

865

self.enabled = True

378

self.send_changedstate()

866

379

self.last_enabled = datetime.datetime.utcnow()

867

self.init_checker()

868

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()

869

392

870

393

def disable(self, quiet=True):

871

394

"""Disable this client."""

872

395

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

873

396

return False

874

397

if not quiet:

398

self.send_changedstate()

399

if not quiet:

875

400

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

876

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

401

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

877

402

gobject.source_remove(self.disable_initiator_tag)

878

403

self.disable_initiator_tag = None

879

self.expires = None

880

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

404

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

881

405

gobject.source_remove(self.checker_initiator_tag)

882

406

self.checker_initiator_tag = None

883

407

self.stop_checker()

408

if self.disable_hook:

409

self.disable_hook(self)

884

410

self.enabled = False

885

if not quiet:

886

self.send_changedstate()

887

411

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

888

412

return False

889

413

890

414

def __del__(self):

415

self.disable_hook = None

891

416

self.disable()

892

417

893

def init_checker(self):

894

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

895

# and every interval from then on.

896

if self.checker_initiator_tag is not None:

897

gobject.source_remove(self.checker_initiator_tag)

898

self.checker_initiator_tag = gobject.timeout_add(

899

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

900

self.start_checker)

901

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

902

if self.disable_initiator_tag is not None:

903

gobject.source_remove(self.disable_initiator_tag)

904

self.disable_initiator_tag = gobject.timeout_add(

905

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

906

# Also start a new checker *right now*.

907

self.start_checker()

908

909

def checker_callback(self, source, condition, connection,

910

command):

418

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

911

419

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

912

420

self.checker_callback_tag = None

913

421

self.checker = None

914

# Read return code from connection (see call_pipe)

915

returncode = connection.recv()

916

connection.close()

917

918

if returncode >= 0:

919

self.last_checker_status = returncode

920

self.last_checker_signal = None

921

if self.last_checker_status == 0:

422

if os.WIFEXITED(condition):

423

exitstatus = os.WEXITSTATUS(condition)

424

if exitstatus == 0:

922

425

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

923

426

vars(self))

924

427

self.checked_ok()

925

428

else:

926

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

429

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

430

vars(self))

927

431

else:

928

self.last_checker_status = -1

929

self.last_checker_signal = -returncode

930

432

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

931

433

vars(self))

932

return False

933

434

934

435

def checked_ok(self):

935

"""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

"""

936

441

self.last_checked_ok = datetime.datetime.utcnow()

937

self.last_checker_status = 0

938

self.last_checker_signal = None

939

self.bump_timeout()

940

941

def bump_timeout(self, timeout=None):

942

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

943

if timeout is None:

944

timeout = self.timeout

945

if self.disable_initiator_tag is not None:

946

gobject.source_remove(self.disable_initiator_tag)

947

self.disable_initiator_tag = None

948

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

949

self.disable_initiator_tag = gobject.timeout_add(

950

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

951

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))

952

446

953

447

def need_approval(self):

954

448

self.last_approval_request = datetime.datetime.utcnow()

959

453

If a checker already exists, leave it running and do

960

454

nothing."""

961

455

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

962

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

963

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

964

# would inevitably timeout, since no checker would get a

965

# 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

966

460

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

967

461

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

968

462

# should be.

969

463

970

if self.checker is not None and not self.checker.is_alive():

971

logger.warning("Checker was not alive; joining")

972

self.checker.join()

973

self.checker = None

464

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

465

try:

466

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

467

except (AttributeError, OSError) as error:

468

if (isinstance(error, OSError)

469

and error.errno != errno.ECHILD):

470

raise error

471

else:

472

if pid:

473

logger.warning("Checker was a zombie")

474

gobject.source_remove(self.checker_callback_tag)

475

self.checker_callback(pid, status,

476

self.current_checker_command)

974

477

# Start a new checker if needed

975

478

if self.checker is None:

976

# Escape attributes for the shell

977

escaped_attrs = {

978

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

979

for attr in self.runtime_expansions }

980

479

try:

981

command = self.checker_command % escaped_attrs

982

except TypeError as error:

983

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

984

self.checker_command,

985

exc_info=error)

986

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

987

498

self.current_checker_command = command

988

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

989

self.name)

990

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

991

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

992

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

993

# always replaced by /dev/null.)

994

# The exception is when not debugging but nevertheless

995

# running in the foreground; use the previously

996

# created wnull.

997

popen_args = { "close_fds": True,

998

"shell": True,

999

"cwd": "/" }

1000

if (not self.server_settings["debug"]

1001

and self.server_settings["foreground"]):

1002

popen_args.update({"stdout": wnull,

1003

"stderr": wnull })

1004

pipe = multiprocessing.Pipe(duplex = False)

1005

self.checker = multiprocessing.Process(

1006

target = call_pipe,

1007

args = (pipe[1], subprocess.call, command),

1008

kwargs = popen_args)

1009

self.checker.start()

1010

self.checker_callback_tag = gobject.io_add_watch(

1011

pipe[0].fileno(), gobject.IO_IN,

1012

self.checker_callback, pipe[0], command)

499

try:

500

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

501

command, self.name)

502

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

503

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

504

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

505

# always replaced by /dev/null.)

506

self.checker = subprocess.Popen(command,

507

close_fds=True,

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.

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)

519

except OSError as error:

520

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

521

error)

1013

522

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

1014

523

return True

1015

524

1021

530

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

1022

531

return

1023

532

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

1024

self.checker.terminate()

533

try:

534

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

535

#time.sleep(0.5)

536

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

537

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

538

except OSError as error:

539

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

540

raise

1025

541

self.checker = None

1026

542

1027

1028

def dbus_service_property(dbus_interface,

1029

signature="v",

1030

access="readwrite",

1031

byte_arrays=False):

543

def dbus_service_property(dbus_interface, signature="v",

544

access="readwrite", byte_arrays=False):

1032

545

"""Decorators for marking methods of a DBusObjectWithProperties to

1033

546

become properties on the D-Bus.

1034

547

1043

556

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

1044

557

if byte_arrays and signature != "ay":

1045

558

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

1046

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

1047

559

" signature %r" % signature)

1048

560

def decorator(func):

1049

561

func._dbus_is_property = True

1050

562

func._dbus_interface = dbus_interface

1055

567

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

1056

568

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

1057

569

return func

1058

1059

return decorator

1060

1061

1062

def dbus_interface_annotations(dbus_interface):

1063

"""Decorator for marking functions returning interface annotations

1064

1065

Usage:

1066

1067

@dbus_interface_annotations("org.example.Interface")

1068

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

1069

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

1070

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

1071

"false"}

1072

"""

1073

1074

def decorator(func):

1075

func._dbus_is_interface = True

1076

func._dbus_interface = dbus_interface

1077

func._dbus_name = dbus_interface

1078

return func

1079

1080

return decorator

1081

1082

1083

def dbus_annotations(annotations):

1084

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

1085

Usage:

1086

1087

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

1088

"org.freedesktop.DBus.Property."

1089

"EmitsChangedSignal": "false"})

1090

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

1091

access="r")

1092

def Property_dbus_property(self):

1093

return dbus.Boolean(False)

1094

1095

See also the DBusObjectWithAnnotations class.

1096

"""

1097

1098

def decorator(func):

1099

func._dbus_annotations = annotations

1100

return func

1101

1102

570

return decorator

1103

571

1104

572

1105

573

class DBusPropertyException(dbus.exceptions.DBusException):

1106

574

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

1107

575

"""

1108

pass

576

def __unicode__(self):

577

return unicode(str(self))

1109

578

1110

579

1111

580

class DBusPropertyAccessException(DBusPropertyException):

1120

589

pass

1121

590

1122

591

1123

class DBusObjectWithAnnotations(dbus.service.Object):

1124

"""A D-Bus object with annotations.

1125

1126

Classes inheriting from this can use the dbus_annotations

1127

decorator to add annotations to methods or signals.

1128

"""

1129

1130

@staticmethod

1131

def _is_dbus_thing(thing):

1132

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

1133

1134

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

1135

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

1136

"""

1137

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

1138

False)

1139

1140

def _get_all_dbus_things(self, thing):

1141

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

1142

"""

1143

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

1144

athing.__get__(self))

1145

for cls in self.__class__.__mro__

1146

for name, athing in

1147

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

1148

1149

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1150

out_signature = "s",

1151

path_keyword = 'object_path',

1152

connection_keyword = 'connection')

1153

def Introspect(self, object_path, connection):

1154

"""Overloading of standard D-Bus method.

1155

1156

Inserts annotation tags on methods and signals.

1157

"""

1158

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

1159

connection)

1160

try:

1161

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

1162

1163

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

1164

# Add annotation tags

1165

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

1166

for tag in if_tag.getElementsByTagName(typ):

1167

annots = dict()

1168

for name, prop in (self.

1169

_get_all_dbus_things(typ)):

1170

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

1171

and prop._dbus_interface

1172

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

1173

annots.update(getattr(

1174

prop, "_dbus_annotations", {}))

1175

for name, value in annots.items():

1176

ann_tag = document.createElement(

1177

"annotation")

1178

ann_tag.setAttribute("name", name)

1179

ann_tag.setAttribute("value", value)

1180

tag.appendChild(ann_tag)

1181

# Add interface annotation tags

1182

for annotation, value in dict(

1183

itertools.chain.from_iterable(

1184

annotations().items()

1185

for name, annotations

1186

in self._get_all_dbus_things("interface")

1187

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

1188

)).items():

1189

ann_tag = document.createElement("annotation")

1190

ann_tag.setAttribute("name", annotation)

1191

ann_tag.setAttribute("value", value)

1192

if_tag.appendChild(ann_tag)

1193

# Fix argument name for the Introspect method itself

1194

if (if_tag.getAttribute("name")

1195

== dbus.INTROSPECTABLE_IFACE):

1196

for cn in if_tag.getElementsByTagName("method"):

1197

if cn.getAttribute("name") == "Introspect":

1198

for arg in cn.getElementsByTagName("arg"):

1199

if (arg.getAttribute("direction")

1200

== "out"):

1201

arg.setAttribute("name",

1202

"xml_data")

1203

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

1204

document.unlink()

1205

except (AttributeError, xml.dom.DOMException,

1206

xml.parsers.expat.ExpatError) as error:

1207

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

1208

exc_info=error)

1209

return xmlstring

1210

1211

1212

class DBusObjectWithProperties(DBusObjectWithAnnotations):

592

class DBusObjectWithProperties(dbus.service.Object):

1213

593

"""A D-Bus object with properties.

1214

594

1215

595

Classes inheriting from this can use the dbus_service_property

1216

596

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

1217

597

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

1218

598

"""

1219

599

600

@staticmethod

601

def _is_dbus_property(obj):

602

return getattr(obj, "_dbus_is_property", False)

603

604

def _get_all_dbus_properties(self):

605

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

606

"""

607

return ((prop._dbus_name, prop)

608

for name, prop in

609

inspect.getmembers(self, self._is_dbus_property))

610

1220

611

def _get_dbus_property(self, interface_name, property_name):

1221

612

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

1222

613

property with the specified name and interface.

1223

614

"""

1224

for cls in self.__class__.__mro__:

1225

for name, value in inspect.getmembers(

1226

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

1227

if (value._dbus_name == property_name

1228

and value._dbus_interface == interface_name):

1229

return value.__get__(self)

1230

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

1231

625

# No such property

1232

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

1233

self.dbus_object_path, interface_name, property_name))

1234

1235

@classmethod

1236

def _get_all_interface_names(cls):

1237

"""Get a sequence of all interfaces supported by an object"""

1238

return (name for name in set(getattr(getattr(x, attr),

1239

"_dbus_interface", None)

1240

for x in (inspect.getmro(cls))

1241

for attr in dir(x))

1242

if name is not None)

1243

1244

@dbus.service.method(dbus.PROPERTIES_IFACE,

1245

in_signature="ss",

626

raise DBusPropertyNotFound(self.dbus_object_path + ":"

627

+ interface_name + "."

628

+ property_name)

629

630

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

1246

631

out_signature="v")

1247

632

def Get(self, interface_name, property_name):

1248

633

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

1266

651

# The byte_arrays option is not supported yet on

1267

652

# signatures other than "ay".

1268

653

if prop._dbus_signature != "ay":

1269

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

1270

"'ay' signature {!r}"

1271

.format(prop._dbus_signature))

1272

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

1273

for byte in value))

654

raise ValueError

655

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

656

for byte in value))

1274

657

prop(value)

1275

658

1276

@dbus.service.method(dbus.PROPERTIES_IFACE,

1277

in_signature="s",

659

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

1278

660

out_signature="a{sv}")

1279

661

def GetAll(self, interface_name):

1280

662

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

1281

663

standard.

1282

664

1283

665

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

1284

666

"""

1285

properties = {}

1286

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

667

all = {}

668

for name, prop in self._get_all_dbus_properties():

1287

669

if (interface_name

1288

670

and interface_name != prop._dbus_interface):

1289

671

# Interface non-empty but did not match

1293

675

continue

1294

676

value = prop()

1295

677

if not hasattr(value, "variant_level"):

1296

properties[name] = value

678

all[name] = value

1297

679

continue

1298

properties[name] = type(value)(

1299

value, variant_level = value.variant_level + 1)

1300

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

1301

1302

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

1303

def PropertiesChanged(self, interface_name, changed_properties,

1304

invalidated_properties):

1305

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

1306

standard.

1307

"""

1308

pass

680

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

681

value.variant_level+1)

682

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

1309

683

1310

684

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1311

685

out_signature="s",

1312

686

path_keyword='object_path',

1313

687

connection_keyword='connection')

1314

688

def Introspect(self, object_path, connection):

1315

"""Overloading of standard D-Bus method.

1316

1317

Inserts property tags and interface annotation tags.

689

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

1318

690

"""

1319

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1320

object_path,

1321

connection)

691

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

692

connection)

1322

693

try:

1323

694

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

1324

1325

695

def make_tag(document, name, prop):

1326

696

e = document.createElement("property")

1327

697

e.setAttribute("name", name)

1328

698

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

1329

699

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

1330

700

return e

1331

1332

701

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

1333

# Add property tags

1334

702

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

1335

703

for name, prop

1336

in self._get_all_dbus_things("property")

704

in self._get_all_dbus_properties()

1337

705

if prop._dbus_interface

1338

706

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

1339

707

if_tag.appendChild(tag)

1340

# Add annotation tags for properties

1341

for tag in if_tag.getElementsByTagName("property"):

1342

annots = dict()

1343

for name, prop in self._get_all_dbus_things(

1344

"property"):

1345

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

1346

and prop._dbus_interface

1347

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

1348

annots.update(getattr(

1349

prop, "_dbus_annotations", {}))

1350

for name, value in annots.items():

1351

ann_tag = document.createElement(

1352

"annotation")

1353

ann_tag.setAttribute("name", name)

1354

ann_tag.setAttribute("value", value)

1355

tag.appendChild(ann_tag)

1356

708

# Add the names to the return values for the

1357

709

# "org.freedesktop.DBus.Properties" methods

1358

710

if (if_tag.getAttribute("name")

1373

725

except (AttributeError, xml.dom.DOMException,

1374

726

xml.parsers.expat.ExpatError) as error:

1375

727

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

1376

exc_info=error)

1377

return xmlstring

1378

1379

try:

1380

dbus.OBJECT_MANAGER_IFACE

1381

except AttributeError:

1382

dbus.OBJECT_MANAGER_IFACE = "org.freedesktop.DBus.ObjectManager"

1383

1384

class DBusObjectWithObjectManager(DBusObjectWithAnnotations):

1385

"""A D-Bus object with an ObjectManager.

1386

1387

Classes inheriting from this exposes the standard

1388

GetManagedObjects call and the InterfacesAdded and

1389

InterfacesRemoved signals on the standard

1390

"org.freedesktop.DBus.ObjectManager" interface.

1391

1392

Note: No signals are sent automatically; they must be sent

1393

manually.

1394

"""

1395

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

1396

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

1397

def GetManagedObjects(self):

1398

"""This function must be overridden"""

1399

raise NotImplementedError()

1400

1401

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,

1402

signature = "oa{sa{sv}}")

1403

def InterfacesAdded(self, object_path, interfaces_and_properties):

1404

pass

1405

1406

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE, signature = "oas")

1407

def InterfacesRemoved(self, object_path, interfaces):

1408

pass

1409

1410

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1411

out_signature = "s",

1412

path_keyword = 'object_path',

1413

connection_keyword = 'connection')

1414

def Introspect(self, object_path, connection):

1415

"""Overloading of standard D-Bus method.

1416

1417

Override return argument name of GetManagedObjects to be

1418

"objpath_interfaces_and_properties"

1419

"""

1420

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1421

object_path,

1422

connection)

1423

try:

1424

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

1425

1426

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

1427

# Fix argument name for the GetManagedObjects method

1428

if (if_tag.getAttribute("name")

1429

== dbus.OBJECT_MANAGER_IFACE):

1430

for cn in if_tag.getElementsByTagName("method"):

1431

if (cn.getAttribute("name")

1432

== "GetManagedObjects"):

1433

for arg in cn.getElementsByTagName("arg"):

1434

if (arg.getAttribute("direction")

1435

== "out"):

1436

arg.setAttribute(

1437

"name",

1438

"objpath_interfaces"

1439

"_and_properties")

1440

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

1441

document.unlink()

1442

except (AttributeError, xml.dom.DOMException,

1443

xml.parsers.expat.ExpatError) as error:

1444

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

1445

exc_info = error)

1446

return xmlstring

1447

1448

def datetime_to_dbus(dt, variant_level=0):

1449

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

1450

if dt is None:

1451

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

1452

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

1453

1454

1455

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1456

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

1457

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

1458

interface names according to the "alt_interface_names" mapping.

1459

Usage:

1460

1461

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

1462

"net.example.AlternateInterface"})

1463

class SampleDBusObject(dbus.service.Object):

1464

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

1465

def SampleDBusMethod():

1466

pass

1467

1468

The above "SampleDBusMethod" on "SampleDBusObject" will be

1469

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

1470

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

1471

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

1472

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

1473

1474

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

1475

(from DBusObjectWithProperties) and interfaces (from the

1476

dbus_interface_annotations decorator).

1477

"""

1478

1479

def wrapper(cls):

1480

for orig_interface_name, alt_interface_name in (

1481

alt_interface_names.items()):

1482

attr = {}

1483

interface_names = set()

1484

# Go though all attributes of the class

1485

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

1486

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

1487

# with the wrong interface name

1488

if (not hasattr(attribute, "_dbus_interface")

1489

or not attribute._dbus_interface.startswith(

1490

orig_interface_name)):

1491

continue

1492

# Create an alternate D-Bus interface name based on

1493

# the current name

1494

alt_interface = attribute._dbus_interface.replace(

1495

orig_interface_name, alt_interface_name)

1496

interface_names.add(alt_interface)

1497

# Is this a D-Bus signal?

1498

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

1499

if sys.version_info.major == 2:

1500

# Extract the original non-method undecorated

1501

# function by black magic

1502

nonmethod_func = (dict(

1503

zip(attribute.func_code.co_freevars,

1504

attribute.__closure__))

1505

["func"].cell_contents)

1506

else:

1507

nonmethod_func = attribute

1508

# Create a new, but exactly alike, function

1509

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

1510

# with the alternate D-Bus interface name

1511

if sys.version_info.major == 2:

1512

new_function = types.FunctionType(

1513

nonmethod_func.func_code,

1514

nonmethod_func.func_globals,

1515

nonmethod_func.func_name,

1516

nonmethod_func.func_defaults,

1517

nonmethod_func.func_closure)

1518

else:

1519

new_function = types.FunctionType(

1520

nonmethod_func.__code__,

1521

nonmethod_func.__globals__,

1522

nonmethod_func.__name__,

1523

nonmethod_func.__defaults__,

1524

nonmethod_func.__closure__)

1525

new_function = (dbus.service.signal(

1526

alt_interface,

1527

attribute._dbus_signature)(new_function))

1528

# Copy annotations, if any

1529

try:

1530

new_function._dbus_annotations = dict(

1531

attribute._dbus_annotations)

1532

except AttributeError:

1533

pass

1534

# Define a creator of a function to call both the

1535

# original and alternate functions, so both the

1536

# original and alternate signals gets sent when

1537

# the function is called

1538

def fixscope(func1, func2):

1539

"""This function is a scope container to pass

1540

func1 and func2 to the "call_both" function

1541

outside of its arguments"""

1542

1543

@functools.wraps(func2)

1544

def call_both(*args, **kwargs):

1545

"""This function will emit two D-Bus

1546

signals by calling func1 and func2"""

1547

func1(*args, **kwargs)

1548

func2(*args, **kwargs)

1549

# Make wrapper function look like a D-Bus signal

1550

for name, attr in inspect.getmembers(func2):

1551

if name.startswith("_dbus_"):

1552

setattr(call_both, name, attr)

1553

1554

return call_both

1555

# Create the "call_both" function and add it to

1556

# the class

1557

attr[attrname] = fixscope(attribute, new_function)

1558

# Is this a D-Bus method?

1559

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

1560

# Create a new, but exactly alike, function

1561

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

1562

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

1563

# to the class.

1564

attr[attrname] = (

1565

dbus.service.method(

1566

alt_interface,

1567

attribute._dbus_in_signature,

1568

attribute._dbus_out_signature)

1569

(types.FunctionType(attribute.func_code,

1570

attribute.func_globals,

1571

attribute.func_name,

1572

attribute.func_defaults,

1573

attribute.func_closure)))

1574

# Copy annotations, if any

1575

try:

1576

attr[attrname]._dbus_annotations = dict(

1577

attribute._dbus_annotations)

1578

except AttributeError:

1579

pass

1580

# Is this a D-Bus property?

1581

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

1582

# Create a new, but exactly alike, function

1583

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

1584

# property with the alternate D-Bus interface

1585

# name. Add it to the class.

1586

attr[attrname] = (dbus_service_property(

1587

alt_interface, attribute._dbus_signature,

1588

attribute._dbus_access,

1589

attribute._dbus_get_args_options

1590

["byte_arrays"])

1591

(types.FunctionType(

1592

attribute.func_code,

1593

attribute.func_globals,

1594

attribute.func_name,

1595

attribute.func_defaults,

1596

attribute.func_closure)))

1597

# Copy annotations, if any

1598

try:

1599

attr[attrname]._dbus_annotations = dict(

1600

attribute._dbus_annotations)

1601

except AttributeError:

1602

pass

1603

# Is this a D-Bus interface?

1604

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

1605

# Create a new, but exactly alike, function

1606

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

1607

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

1608

# to the class.

1609

attr[attrname] = (

1610

dbus_interface_annotations(alt_interface)

1611

(types.FunctionType(attribute.func_code,

1612

attribute.func_globals,

1613

attribute.func_name,

1614

attribute.func_defaults,

1615

attribute.func_closure)))

1616

if deprecate:

1617

# Deprecate all alternate interfaces

1618

iname="_AlternateDBusNames_interface_annotation{}"

1619

for interface_name in interface_names:

1620

1621

@dbus_interface_annotations(interface_name)

1622

def func(self):

1623

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

1624

"true" }

1625

# Find an unused name

1626

for aname in (iname.format(i)

1627

for i in itertools.count()):

1628

if aname not in attr:

1629

attr[aname] = func

1630

break

1631

if interface_names:

1632

# Replace the class with a new subclass of it with

1633

# methods, signals, etc. as created above.

1634

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

1635

(cls, ), attr)

1636

return cls

1637

1638

return wrapper

1639

1640

1641

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

1642

"se.bsnet.fukt.Mandos"})

728

error)

729

return xmlstring

730

731

1643

732

class ClientDBus(Client, DBusObjectWithProperties):

1644

733

"""A Client class using D-Bus

1645

734

1649

738

"""

1650

739

1651

740

runtime_expansions = (Client.runtime_expansions

1652

+ ("dbus_object_path", ))

1653

1654

_interface = "se.recompile.Mandos.Client"

741

+ ("dbus_object_path",))

1655

742

1656

743

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

1657

744

1658

745

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

746

self._approvals_pending = 0

1659

747

self.bus = bus

1660

748

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

1661

749

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

1662

750

# the D-Bus

1663

client_object_name = str(self.name).translate(

751

client_object_name = unicode(self.name).translate(

1664

752

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

1665

753

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

1666

self.dbus_object_path = dbus.ObjectPath(

1667

"/clients/" + client_object_name)

754

self.dbus_object_path = (dbus.ObjectPath

755

("/clients/" + client_object_name))

1668

756

DBusObjectWithProperties.__init__(self, self.bus,

1669

757

self.dbus_object_path)

1670

1671

def notifychangeproperty(transform_func, dbus_name,

1672

type_func=lambda x: x,

1673

variant_level=1,

1674

invalidate_only=False,

1675

_interface=_interface):

1676

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

1677

its changes to DBus.

1678

1679

transform_fun: Function that takes a value and a variant_level

1680

and transforms it to a D-Bus type.

1681

dbus_name: D-Bus name of the variable

1682

type_func: Function that transform the value before sending it

1683

to the D-Bus. Default: no transform

1684

variant_level: D-Bus variant level. Default: 1

1685

"""

1686

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

1687

1688

def setter(self, value):

1689

if hasattr(self, "dbus_object_path"):

1690

if (not hasattr(self, attrname) or

1691

type_func(getattr(self, attrname, None))

1692

!= type_func(value)):

1693

if invalidate_only:

1694

self.PropertiesChanged(

1695

_interface, dbus.Dictionary(),

1696

dbus.Array((dbus_name, )))

1697

else:

1698

dbus_value = transform_func(

1699

type_func(value),

1700

variant_level = variant_level)

1701

self.PropertyChanged(dbus.String(dbus_name),

1702

dbus_value)

1703

self.PropertiesChanged(

1704

_interface,

1705

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

1706

dbus_value }),

1707

dbus.Array())

1708

setattr(self, attrname, value)

1709

1710

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

1711

1712

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1713

approvals_pending = notifychangeproperty(dbus.Boolean,

1714

"ApprovalPending",

1715

type_func = bool)

1716

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

1717

last_enabled = notifychangeproperty(datetime_to_dbus,

1718

"LastEnabled")

1719

checker = notifychangeproperty(

1720

dbus.Boolean, "CheckerRunning",

1721

type_func = lambda checker: checker is not None)

1722

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1723

"LastCheckedOK")

1724

last_checker_status = notifychangeproperty(dbus.Int16,

1725

"LastCheckerStatus")

1726

last_approval_request = notifychangeproperty(

1727

datetime_to_dbus, "LastApprovalRequest")

1728

approved_by_default = notifychangeproperty(dbus.Boolean,

1729

"ApprovedByDefault")

1730

approval_delay = notifychangeproperty(

1731

dbus.UInt64, "ApprovalDelay",

1732

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

1733

approval_duration = notifychangeproperty(

1734

dbus.UInt64, "ApprovalDuration",

1735

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

1736

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

1737

timeout = notifychangeproperty(

1738

dbus.UInt64, "Timeout",

1739

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

1740

extended_timeout = notifychangeproperty(

1741

dbus.UInt64, "ExtendedTimeout",

1742

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

1743

interval = notifychangeproperty(

1744

dbus.UInt64, "Interval",

1745

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

1746

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

1747

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

1748

invalidate_only=True)

1749

1750

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

1751

802

1752

803

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

1753

804

try:

1758

809

DBusObjectWithProperties.__del__(self, *args, **kwargs)

1759

810

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

1760

811

1761

def checker_callback(self, source, condition,

1762

connection, command, *args, **kwargs):

1763

ret = Client.checker_callback(self, source, condition,

1764

connection, command, *args,

1765

**kwargs)

1766

exitstatus = self.last_checker_status

1767

if exitstatus >= 0:

812

def checker_callback(self, pid, condition, command,

813

*args, **kwargs):

814

self.checker_callback_tag = None

815

self.checker = None

816

# Emit D-Bus signal

817

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

818

dbus.Boolean(False, variant_level=1))

819

if os.WIFEXITED(condition):

820

exitstatus = os.WEXITSTATUS(condition)

1768

821

# Emit D-Bus signal

1769

822

self.CheckerCompleted(dbus.Int16(exitstatus),

1770

# This is specific to GNU libC

1771

dbus.Int64(exitstatus << 8),

823

dbus.Int64(condition),

1772

824

dbus.String(command))

1773

825

else:

1774

826

# Emit D-Bus signal

1775

827

self.CheckerCompleted(dbus.Int16(-1),

1776

dbus.Int64(

1777

# This is specific to GNU libC

1778

(exitstatus << 8)

1779

| self.last_checker_signal),

828

dbus.Int64(condition),

1780

829

dbus.String(command))

1781

return ret

830

831

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

832

*args, **kwargs)

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

1782

850

1783

851

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

1784

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

1785

857

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

1786

858

# Only if new checker process was started

1787

859

if (self.checker is not None

1788

860

and old_checker_pid != self.checker.pid):

1789

861

# Emit D-Bus signal

1790

862

self.CheckerStarted(self.current_checker_command)

863

self.PropertyChanged(

864

dbus.String("CheckerRunning"),

865

dbus.Boolean(True, variant_level=1))

1791

866

return r

1792

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

1793

877

def _reset_approved(self):

1794

self.approved = None

878

self._approved = None

1795

879

return False

1796

880

1797

881

def approve(self, value=True):

1798

self.approved = value

1799

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

1800

* 1000), self._reset_approved)

1801

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

1802

888

1803

889

## D-Bus methods, signals & properties

1804

1805

## Interfaces

890

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

1806

891

1807

892

## Signals

1808

893

1819

904

pass

1820

905

1821

906

# PropertyChanged - signal

1822

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

1823

907

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

1824

908

def PropertyChanged(self, property, value):

1825

909

"D-Bus signal"

1859

943

self.checked_ok()

1860

944

1861

945

# Enable - method

1862

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

1863

946

@dbus.service.method(_interface)

1864

947

def Enable(self):

1865

948

"D-Bus method"

1866

949

self.enable()

1867

950

1868

951

# StartChecker - method

1869

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

1870

952

@dbus.service.method(_interface)

1871

953

def StartChecker(self):

1872

954

"D-Bus method"

1873

955

self.start_checker()

1874

956

1875

957

# Disable - method

1876

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

1877

958

@dbus.service.method(_interface)

1878

959

def Disable(self):

1879

960

"D-Bus method"

1880

961

self.disable()

1881

962

1882

963

# StopChecker - method

1883

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

1884

964

@dbus.service.method(_interface)

1885

965

def StopChecker(self):

1886

966

self.stop_checker()

1893

973

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

1894

974

1895

975

# ApprovedByDefault - property

1896

@dbus_service_property(_interface,

1897

signature="b",

976

@dbus_service_property(_interface, signature="b",

1898

977

access="readwrite")

1899

978

def ApprovedByDefault_dbus_property(self, value=None):

1900

979

if value is None: # get

1901

980

return dbus.Boolean(self.approved_by_default)

1902

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))

1903

985

1904

986

# ApprovalDelay - property

1905

@dbus_service_property(_interface,

1906

signature="t",

987

@dbus_service_property(_interface, signature="t",

1907

988

access="readwrite")

1908

989

def ApprovalDelay_dbus_property(self, value=None):

1909

990

if value is None: # get

1910

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

1911

* 1000)

991

return dbus.UInt64(self.approval_delay_milliseconds())

1912

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))

1913

996

1914

997

# ApprovalDuration - property

1915

@dbus_service_property(_interface,

1916

signature="t",

998

@dbus_service_property(_interface, signature="t",

1917

999

access="readwrite")

1918

1000

def ApprovalDuration_dbus_property(self, value=None):

1919

1001

if value is None: # get

1920

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

1921

* 1000)

1002

return dbus.UInt64(self._timedelta_to_milliseconds(

1003

self.approval_duration))

1922

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))

1923

1008

1924

1009

# Name - property

1925

@dbus_annotations(

1926

{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})

1927

1010

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

1928

1011

def Name_dbus_property(self):

1929

1012

return dbus.String(self.name)

1930

1013

1931

1014

# Fingerprint - property

1932

@dbus_annotations(

1933

{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})

1934

1015

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

1935

1016

def Fingerprint_dbus_property(self):

1936

1017

return dbus.String(self.fingerprint)

1937

1018

1938

1019

# Host - property

1939

@dbus_service_property(_interface,

1940

signature="s",

1020

@dbus_service_property(_interface, signature="s",

1941

1021

access="readwrite")

1942

1022

def Host_dbus_property(self, value=None):

1943

1023

if value is None: # get

1944

1024

return dbus.String(self.host)

1945

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))

1946

1029

1947

1030

# Created - property

1948

@dbus_annotations(

1949

{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})

1950

1031

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

1951

1032

def Created_dbus_property(self):

1952

return datetime_to_dbus(self.created)

1033

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

1953

1034

1954

1035

# LastEnabled - property

1955

1036

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

1956

1037

def LastEnabled_dbus_property(self):

1957

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))

1958

1041

1959

1042

# Enabled - property

1960

@dbus_service_property(_interface,

1961

signature="b",

1043

@dbus_service_property(_interface, signature="b",

1962

1044

access="readwrite")

1963

1045

def Enabled_dbus_property(self, value=None):

1964

1046

if value is None: # get

1969

1051

self.disable()

1970

1052

1971

1053

# LastCheckedOK - property

1972

@dbus_service_property(_interface,

1973

signature="s",

1054

@dbus_service_property(_interface, signature="s",

1974

1055

access="readwrite")

1975

1056

def LastCheckedOK_dbus_property(self, value=None):

1976

1057

if value is not None:

1977

1058

self.checked_ok()

1978

1059

return

1979

return datetime_to_dbus(self.last_checked_ok)

1980

1981

# LastCheckerStatus - property

1982

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

1983

def LastCheckerStatus_dbus_property(self):

1984

return dbus.Int16(self.last_checker_status)

1985

1986

# Expires - property

1987

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

1988

def Expires_dbus_property(self):

1989

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))

1990

1064

1991

1065

# LastApprovalRequest - property

1992

1066

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

1993

1067

def LastApprovalRequest_dbus_property(self):

1994

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))

1995

1073

1996

1074

# Timeout - property

1997

@dbus_service_property(_interface,

1998

signature="t",

1075

@dbus_service_property(_interface, signature="t",

1999

1076

access="readwrite")

2000

1077

def Timeout_dbus_property(self, value=None):

2001

1078

if value is None: # get

2002

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

2003

old_timeout = self.timeout

1079

return dbus.UInt64(self.timeout_milliseconds())

2004

1080

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

2005

# Reschedule disabling

2006

if self.enabled:

2007

now = datetime.datetime.utcnow()

2008

self.expires += self.timeout - old_timeout

2009

if self.expires <= now:

2010

# The timeout has passed

2011

self.disable()

2012

else:

2013

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

2014

is None):

2015

return

2016

gobject.source_remove(self.disable_initiator_tag)

2017

self.disable_initiator_tag = gobject.timeout_add(

2018

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

2019

self.disable)

2020

2021

# ExtendedTimeout - property

2022

@dbus_service_property(_interface,

2023

signature="t",

2024

access="readwrite")

2025

def ExtendedTimeout_dbus_property(self, value=None):

2026

if value is None: # get

2027

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

2028

* 1000)

2029

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))

2030

1101

2031

1102

# Interval - property

2032

@dbus_service_property(_interface,

2033

signature="t",

1103

@dbus_service_property(_interface, signature="t",

2034

1104

access="readwrite")

2035

1105

def Interval_dbus_property(self, value=None):

2036

1106

if value is None: # get

2037

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

1107

return dbus.UInt64(self.interval_milliseconds())

2038

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))

2039

1112

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

2040

1113

return

2041

if self.enabled:

2042

# Reschedule checker run

2043

gobject.source_remove(self.checker_initiator_tag)

2044

self.checker_initiator_tag = gobject.timeout_add(

2045

value, self.start_checker)

2046

self.start_checker() # Start one now, too

2047

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

2048

1120

# Checker - property

2049

@dbus_service_property(_interface,

2050

signature="s",

1121

@dbus_service_property(_interface, signature="s",

2051

1122

access="readwrite")

2052

1123

def Checker_dbus_property(self, value=None):

2053

1124

if value is None: # get

2054

1125

return dbus.String(self.checker_command)

2055

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))

2056

1131

2057

1132

# CheckerRunning - property

2058

@dbus_service_property(_interface,

2059

signature="b",

1133

@dbus_service_property(_interface, signature="b",

2060

1134

access="readwrite")

2061

1135

def CheckerRunning_dbus_property(self, value=None):

2062

1136

if value is None: # get

2067

1141

self.stop_checker()

2068

1142

2069

1143

# ObjectPath - property

2070

@dbus_annotations(

2071

{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const",

2072

"org.freedesktop.DBus.Deprecated": "true"})

2073

1144

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

2074

1145

def ObjectPath_dbus_property(self):

2075

1146

return self.dbus_object_path # is already a dbus.ObjectPath

2076

1147

2077

1148

# Secret = property

2078

@dbus_annotations(

2079

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

2080

"invalidates"})

2081

@dbus_service_property(_interface,

2082

signature="ay",

2083

access="write",

2084

byte_arrays=True)

1149

@dbus_service_property(_interface, signature="ay",

1150

access="write", byte_arrays=True)

2085

1151

def Secret_dbus_property(self, value):

2086

self.secret = bytes(value)

1152

self.secret = str(value)

2087

1153

2088

1154

del _interface

2089

1155

2093

1159

self._pipe = child_pipe

2094

1160

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

2095

1161

if not self._pipe.recv():

2096

raise KeyError(fpr)

2097

1162

raise KeyError()

1163

2098

1164

def __getattribute__(self, name):

2099

if name == '_pipe':

1165

if(name == '_pipe'):

2100

1166

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

2101

1167

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

2102

1168

data = self._pipe.recv()

2103

1169

if data[0] == 'data':

2104

1170

return data[1]

2105

1171

if data[0] == 'function':

2106

2107

1172

def func(*args, **kwargs):

2108

1173

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

2109

1174

return self._pipe.recv()[1]

2110

2111

1175

return func

2112

1176

2113

1177

def __setattr__(self, name, value):

2114

if name == '_pipe':

1178

if(name == '_pipe'):

2115

1179

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

2116

1180

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

2117

1181

2125

1189

def handle(self):

2126

1190

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

2127

1191

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

2128

str(self.client_address))

1192

unicode(self.client_address))

2129

1193

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

2130

1194

self.server.child_pipe.fileno())

2131

2132

session = gnutls.ClientSession(self.request)

2133

1195

1196

session = (gnutls.connection

1197

.ClientSession(self.request,

1198

gnutls.connection

1199

.X509Credentials()))

1200

1201

# Note: gnutls.connection.X509Credentials is really a

1202

# generic GnuTLS certificate credentials object so long as

1203

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

1204

# here despite using OpenPGP certificates.

1205

2134

1206

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

2135

1207

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

2136

1208

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

2139

1211

priority = self.server.gnutls_priority

2140

1212

if priority is None:

2141

1213

priority = "NORMAL"

2142

gnutls.priority_set_direct(session._c_object, priority,

2143

None)

2144

1214

(gnutls.library.functions

1215

.gnutls_priority_set_direct(session._c_object,

1216

priority, None))

1217

2145

1218

# Start communication using the Mandos protocol

2146

1219

# Get protocol number

2147

1220

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

2148

1221

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

2149

1222

try:

2150

1223

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

2151

raise RuntimeError(line)

1224

raise RuntimeError

2152

1225

except (ValueError, IndexError, RuntimeError) as error:

2153

1226

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

2154

1227

return

2155

1228

2156

1229

# Start GnuTLS connection

2157

1230

try:

2158

1231

session.handshake()

2159

except gnutls.Error as error:

1232

except gnutls.errors.GNUTLSError as error:

2160

1233

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

2161

1234

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

2162

1235

# established. Just abandon the request.

2163

1236

return

2164

1237

logger.debug("Handshake succeeded")

2165

1238

2166

1239

approval_required = False

2167

1240

try:

2168

1241

try:

2169

fpr = self.fingerprint(

2170

self.peer_certificate(session))

2171

except (TypeError, gnutls.Error) as error:

1242

fpr = self.fingerprint(self.peer_certificate

1243

(session))

1244

except (TypeError,

1245

gnutls.errors.GNUTLSError) as error:

2172

1246

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

2173

1247

return

2174

1248

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

2175

1249

2176

1250

try:

2177

1251

client = ProxyClient(child_pipe, fpr,

2178

1252

self.client_address)

2186

1260

2187

1261

while True:

2188

1262

if not client.enabled:

2189

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

2190

client.name)

1263

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

1264

client.name)

2191

1265

if self.server.use_dbus:

2192

1266

# Emit D-Bus signal

2193

client.Rejected("Disabled")

1267

client.Rejected("Disabled")

2194

1268

return

2195

1269

2196

if client.approved or not client.approval_delay:

1270

if client._approved or not client.approval_delay:

2197

1271

#We are approved or approval is disabled

2198

1272

break

2199

elif client.approved is None:

1273

elif client._approved is None:

2200

1274

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

2201

1275

client.name)

2202

1276

if self.server.use_dbus:

2203

1277

# Emit D-Bus signal

2204

1278

client.NeedApproval(

2205

client.approval_delay.total_seconds()

2206

* 1000, client.approved_by_default)

1279

client.approval_delay_milliseconds(),

1280

client.approved_by_default)

2207

1281

else:

2208

1282

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

2209

1283

client.name)

2213

1287

return

2214

1288

2215

1289

#wait until timeout or approved

1290

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

2216

1291

time = datetime.datetime.now()

2217

1292

client.changedstate.acquire()

2218

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

1293

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

2219

1294

client.changedstate.release()

2220

1295

time2 = datetime.datetime.now()

2221

1296

if (time2 - time) >= delay:

2232

1307

else:

2233

1308

delay -= time2 - time

2234

1309

2235

try:

2236

session.send(client.secret)

2237

except gnutls.Error as error:

2238

logger.warning("gnutls send failed",

2239

exc_info = error)

2240

return

2241

1310

sent_size = 0

1311

while sent_size < len(client.secret):

1312

try:

1313

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

1314

except gnutls.errors.GNUTLSError as error:

1315

logger.warning("gnutls send failed")

1316

return

1317

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

1318

sent, len(client.secret)

1319

- (sent_size + sent))

1320

sent_size += sent

1321

2242

1322

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

2243

# bump the timeout using extended_timeout

2244

client.bump_timeout(client.extended_timeout)

1323

# bump the timeout as if seen

1324

client.checked_ok()

2245

1325

if self.server.use_dbus:

2246

1326

# Emit D-Bus signal

2247

1327

client.GotSecret()

2251

1331

client.approvals_pending -= 1

2252

1332

try:

2253

1333

session.bye()

2254

except gnutls.Error as error:

2255

logger.warning("GnuTLS bye failed",

2256

exc_info=error)

1334

except gnutls.errors.GNUTLSError as error:

1335

logger.warning("GnuTLS bye failed")

2257

1336

2258

1337

@staticmethod

2259

1338

def peer_certificate(session):

2260

1339

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

2261

1340

# If not an OpenPGP certificate...

2262

if (gnutls.certificate_type_get(session._c_object)

2263

!= gnutls.CRT_OPENPGP):

2264

# ...return invalid data

2265

return b""

1341

if (gnutls.library.functions

1342

.gnutls_certificate_type_get(session._c_object)

1343

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

1344

# ...do the normal thing

1345

return session.peer_certificate

2266

1346

list_size = ctypes.c_uint(1)

2267

cert_list = (gnutls.certificate_get_peers

1347

cert_list = (gnutls.library.functions

1348

.gnutls_certificate_get_peers

2268

1349

(session._c_object, ctypes.byref(list_size)))

2269

1350

if not bool(cert_list) and list_size.value != 0:

2270

raise gnutls.Error("error getting peer certificate")

1351

raise gnutls.errors.GNUTLSError("error getting peer"

1352

" certificate")

2271

1353

if list_size.value == 0:

2272

1354

return None

2273

1355

cert = cert_list[0]

2277

1359

def fingerprint(openpgp):

2278

1360

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

2279

1361

# New GnuTLS "datum" with the OpenPGP public key

2280

datum = gnutls.datum_t(

2281

ctypes.cast(ctypes.c_char_p(openpgp),

2282

ctypes.POINTER(ctypes.c_ubyte)),

2283

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))))

2284

1367

# New empty GnuTLS certificate

2285

crt = gnutls.openpgp_crt_t()

2286

gnutls.openpgp_crt_init(ctypes.byref(crt))

1368

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1369

(gnutls.library.functions

1370

.gnutls_openpgp_crt_init(ctypes.byref(crt)))

2287

1371

# Import the OpenPGP public key into the certificate

2288

gnutls.openpgp_crt_import(crt, ctypes.byref(datum),

2289

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))

2290

1376

# Verify the self signature in the key

2291

1377

crtverify = ctypes.c_uint()

2292

gnutls.openpgp_crt_verify_self(crt, 0,

2293

ctypes.byref(crtverify))

1378

(gnutls.library.functions

1379

.gnutls_openpgp_crt_verify_self(crt, 0,

1380

ctypes.byref(crtverify)))

2294

1381

if crtverify.value != 0:

2295

gnutls.openpgp_crt_deinit(crt)

2296

raise gnutls.CertificateSecurityError("Verify failed")

1382

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1383

raise (gnutls.errors.CertificateSecurityError

1384

("Verify failed"))

2297

1385

# New buffer for the fingerprint

2298

1386

buf = ctypes.create_string_buffer(20)

2299

1387

buf_len = ctypes.c_size_t()

2300

1388

# Get the fingerprint from the certificate into the buffer

2301

gnutls.openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),

2302

ctypes.byref(buf_len))

1389

(gnutls.library.functions

1390

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

1391

ctypes.byref(buf_len)))

2303

1392

# Deinit the certificate

2304

gnutls.openpgp_crt_deinit(crt)

1393

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2305

1394

# Convert the buffer to a Python bytestring

2306

1395

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

2307

1396

# Convert the bytestring to hexadecimal notation

2308

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

1397

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

2309

1398

return hex_fpr

2310

1399

2311

1400

2312

1401

class MultiprocessingMixIn(object):

2313

1402

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

2314

2315

1403

def sub_process_main(self, request, address):

2316

1404

try:

2317

1405

self.finish_request(request, address)

2318

except Exception:

1406

except:

2319

1407

self.handle_error(request, address)

2320

1408

self.close_request(request)

2321

1409

2322

1410

def process_request(self, request, address):

2323

1411

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

2324

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

2325

args = (request, address))

2326

proc.start()

2327

return proc

2328

1412

multiprocessing.Process(target = self.sub_process_main,

1413

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

2329

1414

2330

1415

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

2331

1416

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

2332

2333

1417

def process_request(self, request, client_address):

2334

1418

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

2335

1419

2336

1420

This function creates a new pipe in self.pipe

2337

1421

"""

2338

1422

parent_pipe, self.child_pipe = multiprocessing.Pipe()

2339

2340

proc = MultiprocessingMixIn.process_request(self, request,

2341

client_address)

1423

1424

super(MultiprocessingMixInWithPipe,

1425

self).process_request(request, client_address)

2342

1426

self.child_pipe.close()

2343

self.add_pipe(parent_pipe, proc)

2344

2345

def add_pipe(self, parent_pipe, proc):

1427

self.add_pipe(parent_pipe)

1428

1429

def add_pipe(self, parent_pipe):

2346

1430

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

2347

raise NotImplementedError()

2348

1431

raise NotImplementedError

2349

1432

2350

1433

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

2351

1434

socketserver.TCPServer, object):

2356

1439

interface: None or a network interface name (string)

2357

1440

use_ipv6: Boolean; to use IPv6 or not

2358

1441

"""

2359

2360

1442

def __init__(self, server_address, RequestHandlerClass,

2361

interface=None,

2362

use_ipv6=True,

2363

socketfd=None):

2364

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

2365

creating a new one with socket.socket().

2366

"""

1443

interface=None, use_ipv6=True):

2367

1444

self.interface = interface

2368

1445

if use_ipv6:

2369

1446

self.address_family = socket.AF_INET6

2370

if socketfd is not None:

2371

# Save the file descriptor

2372

self.socketfd = socketfd

2373

# Save the original socket.socket() function

2374

self.socket_socket = socket.socket

2375

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

2376

#

2377

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

2378

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

2379

# patching socket.socket.)

2380

#

2381

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

2382

@functools.wraps(socket.socket)

2383

def socket_wrapper(*args, **kwargs):

2384

# Restore original function so subsequent calls are

2385

# not affected.

2386

socket.socket = self.socket_socket

2387

del self.socket_socket

2388

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

2389

# saved file descriptor.

2390

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

2391

# Replace socket.socket() function with wrapper

2392

socket.socket = socket_wrapper

2393

# The socketserver.TCPServer.__init__ will call

2394

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

2395

# socket_wrapper(), if socketfd was set.

2396

1447

socketserver.TCPServer.__init__(self, server_address,

2397

1448

RequestHandlerClass)

2398

2399

1449

def server_bind(self):

2400

1450

"""This overrides the normal server_bind() function

2401

1451

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

2407

1457

self.interface)

2408

1458

else:

2409

1459

try:

2410

self.socket.setsockopt(

2411

socket.SOL_SOCKET, SO_BINDTODEVICE,

2412

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

1460

self.socket.setsockopt(socket.SOL_SOCKET,

1461

SO_BINDTODEVICE,

1462

str(self.interface

1463

+ '\0'))

2413

1464

except socket.error as error:

2414

if error.errno == errno.EPERM:

2415

logger.error("No permission to bind to"

2416

" interface %s", self.interface)

2417

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:

2418

1470

logger.error("SO_BINDTODEVICE not available;"

2419

1471

" cannot bind to interface %s",

2420

1472

self.interface)

2421

elif error.errno == errno.ENODEV:

2422

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

2423

" cannot bind", self.interface)

2424

1473

else:

2425

1474

raise

2426

1475

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

2429

1478

if self.address_family == socket.AF_INET6:

2430

1479

any_address = "::" # in6addr_any

2431

1480

else:

2432

any_address = "0.0.0.0" # INADDR_ANY

1481

any_address = socket.INADDR_ANY

2433

1482

self.server_address = (any_address,

2434

1483

self.server_address[1])

2435

1484

elif not self.server_address[1]:

2436

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

1485

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

1486

0)

2437

1487

# if self.interface:

2438

1488

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

2439

1489

# 0, # port

2453

1503

2454

1504

Assumes a gobject.MainLoop event loop.

2455

1505

"""

2456

2457

1506

def __init__(self, server_address, RequestHandlerClass,

2458

interface=None,

2459

use_ipv6=True,

2460

clients=None,

2461

gnutls_priority=None,

2462

use_dbus=True,

2463

socketfd=None):

1507

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

1508

gnutls_priority=None, use_dbus=True):

2464

1509

self.enabled = False

2465

1510

self.clients = clients

2466

1511

if self.clients is None:

2467

self.clients = {}

1512

self.clients = set()

2468

1513

self.use_dbus = use_dbus

2469

1514

self.gnutls_priority = gnutls_priority

2470

1515

IPv6_TCPServer.__init__(self, server_address,

2471

1516

RequestHandlerClass,

2472

1517

interface = interface,

2473

use_ipv6 = use_ipv6,

2474

socketfd = socketfd)

2475

1518

use_ipv6 = use_ipv6)

2476

1519

def server_activate(self):

2477

1520

if self.enabled:

2478

1521

return socketserver.TCPServer.server_activate(self)

2479

2480

1522

def enable(self):

2481

1523

self.enabled = True

2482

2483

def add_pipe(self, parent_pipe, proc):

1524

def add_pipe(self, parent_pipe):

2484

1525

# Call "handle_ipc" for both data and EOF events

2485

gobject.io_add_watch(

2486

parent_pipe.fileno(),

2487

gobject.IO_IN | gobject.IO_HUP,

2488

functools.partial(self.handle_ipc,

2489

parent_pipe = parent_pipe,

2490

proc = proc))

2491

2492

def handle_ipc(self, source, condition,

2493

parent_pipe=None,

2494

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,

2495

1532

client_object=None):

2496

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

2497

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

2498

# Wait for other process to exit

2499

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):

2500

1549

return False

2501

1550

2502

1551

# Read a request from the child

2507

1556

fpr = request[1]

2508

1557

address = request[2]

2509

1558

2510

for c in self.clients.itervalues():

1559

for c in self.clients:

2511

1560

if c.fingerprint == fpr:

2512

1561

client = c

2513

1562

break

2514

1563

else:

2515

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

2516

"dress: %s", fpr, address)

1564

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

1565

"dress: %s", fpr, address)

2517

1566

if self.use_dbus:

2518

1567

# Emit D-Bus signal

2519

mandos_dbus_service.ClientNotFound(fpr,

2520

address[0])

1568

mandos_dbus_service.ClientNotFound(fpr, address[0])

2521

1569

parent_pipe.send(False)

2522

1570

return False

2523

1571

2524

gobject.io_add_watch(

2525

parent_pipe.fileno(),

2526

gobject.IO_IN | gobject.IO_HUP,

2527

functools.partial(self.handle_ipc,

2528

parent_pipe = parent_pipe,

2529

proc = proc,

2530

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))

2531

1577

parent_pipe.send(True)

2532

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

2533

# same fileno

1578

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

2534

1579

return False

2535

1580

if command == 'funcall':

2536

1581

funcname = request[1]

2537

1582

args = request[2]

2538

1583

kwargs = request[3]

2539

1584

2540

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

2541

funcname)(*args,

2542

**kwargs)))

2543

1585

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

1586

2544

1587

if command == 'getattr':

2545

1588

attrname = request[1]

2546

if isinstance(client_object.__getattribute__(attrname),

2547

collections.Callable):

2548

parent_pipe.send(('function', ))

1589

if callable(client_object.__getattribute__(attrname)):

1590

parent_pipe.send(('function',))

2549

1591

else:

2550

parent_pipe.send((

2551

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

1592

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

2552

1593

2553

1594

if command == 'setattr':

2554

1595

attrname = request[1]

2555

1596

value = request[2]

2556

1597

setattr(client_object, attrname, value)

2557

1598

2558

1599

return True

2559

1600

2560

1601

2561

def rfc3339_duration_to_delta(duration):

2562

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

2563

2564

>>> rfc3339_duration_to_delta("P7D")

2565

datetime.timedelta(7)

2566

>>> rfc3339_duration_to_delta("PT60S")

2567

datetime.timedelta(0, 60)

2568

>>> rfc3339_duration_to_delta("PT60M")

2569

datetime.timedelta(0, 3600)

2570

>>> rfc3339_duration_to_delta("PT24H")

2571

datetime.timedelta(1)

2572

>>> rfc3339_duration_to_delta("P1W")

2573

datetime.timedelta(7)

2574

>>> rfc3339_duration_to_delta("PT5M30S")

2575

datetime.timedelta(0, 330)

2576

>>> rfc3339_duration_to_delta("P1DT3M20S")

2577

datetime.timedelta(1, 200)

2578

"""

2579

2580

# Parsing an RFC 3339 duration with regular expressions is not

2581

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

2582

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

2583

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

2584

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

2585

# avoid excessive use of external libraries.

2586

2587

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

2588

Token = collections.namedtuple("Token", (

2589

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

2590

# a "group" containing digits

2591

"value", # datetime.timedelta or None

2592

"followers")) # Tokens valid after this token

2593

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

2594

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

2595

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

2596

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

2597

datetime.timedelta(seconds=1),

2598

frozenset((token_end, )))

2599

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

2600

datetime.timedelta(minutes=1),

2601

frozenset((token_second, token_end)))

2602

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

2603

datetime.timedelta(hours=1),

2604

frozenset((token_minute, token_end)))

2605

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

2606

None,

2607

frozenset((token_hour, token_minute,

2608

token_second)))

2609

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

2610

datetime.timedelta(days=1),

2611

frozenset((token_time, token_end)))

2612

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

2613

datetime.timedelta(weeks=4),

2614

frozenset((token_day, token_end)))

2615

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

2616

datetime.timedelta(weeks=52),

2617

frozenset((token_month, token_end)))

2618

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

2619

datetime.timedelta(weeks=1),

2620

frozenset((token_end, )))

2621

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

2622

frozenset((token_year, token_month,

2623

token_day, token_time,

2624

token_week)))

2625

# Define starting values

2626

value = datetime.timedelta() # Value so far

2627

found_token = None

2628

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

2629

s = duration # String left to parse

2630

# Loop until end token is found

2631

while found_token is not token_end:

2632

# Search for any currently valid tokens

2633

for token in followers:

2634

match = token.regexp.match(s)

2635

if match is not None:

2636

# Token found

2637

if token.value is not None:

2638

# Value found, parse digits

2639

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

2640

# Add to value so far

2641

value += factor * token.value

2642

# Strip token from string

2643

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

2644

# Go to found token

2645

found_token = token

2646

# Set valid next tokens

2647

followers = found_token.followers

2648

break

2649

else:

2650

# No currently valid tokens were found

2651

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

2652

.format(duration))

2653

# End token found

2654

return value

2655

2656

2657

1602

def string_to_delta(interval):

2658

1603

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

2659

1604

2670

1615

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

2671

1616

datetime.timedelta(0, 330)

2672

1617

"""

2673

2674

try:

2675

return rfc3339_duration_to_delta(interval)

2676

except ValueError:

2677

pass

2678

2679

1618

timevalue = datetime.timedelta(0)

2680

1619

for s in interval.split():

2681

1620

try:

2682

suffix = s[-1]

1621

suffix = unicode(s[-1])

2683

1622

value = int(s[:-1])

2684

1623

if suffix == "d":

2685

1624

delta = datetime.timedelta(value)

2692

1631

elif suffix == "w":

2693

1632

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

2694

1633

else:

2695

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

2696

except IndexError as e:

1634

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

1635

except (ValueError, IndexError) as e:

2697

1636

raise ValueError(*(e.args))

2698

1637

timevalue += delta

2699

1638

return timevalue

2700

1639

2701

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

2702

1665

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

2703

1666

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

2704

1667

2712

1675

sys.exit()

2713

1676

if not noclose:

2714

1677

# Close all standard open file descriptors

2715

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

1678

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

2716

1679

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

2717

1680

raise OSError(errno.ENODEV,

2718

"{} not a character device"

2719

.format(os.devnull))

1681

"%s not a character device"

1682

% os.path.devnull)

2720

1683

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

2721

1684

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

2722

1685

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

2731

1694

2732

1695

parser = argparse.ArgumentParser()

2733

1696

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

2734

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

1697

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

2735

1698

help="show version number and exit")

2736

1699

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

2737

1700

help="Bind to interface IF")

2743

1706

help="Run self-test")

2744

1707

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

2745

1708

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

2746

" to terminal", default=None)

1709

" to terminal")

2747

1710

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

2748

1711

help="Debug level for stdout output")

2749

1712

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

2756

1719

" files")

2757

1720

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

2758

1721

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

2759

" system bus interface", default=None)

1722

" system bus interface")

2760

1723

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

2761

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

2762

default=None)

2763

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

2764

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

2765

" state", default=None)

2766

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

2767

help="Specify a file descriptor to a network"

2768

" socket to use instead of creating one")

2769

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

2770

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

2771

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

2772

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

2773

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

2774

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

2775

default=None)

2776

1724

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

2777

1725

options = parser.parse_args()

2778

1726

2779

1727

if options.check:

2780

1728

import doctest

2781

fail_count, test_count = doctest.testmod()

2782

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

1729

doctest.testmod()

1730

sys.exit()

2783

1731

2784

1732

# Default values for config file for server-global settings

2785

1733

server_defaults = { "interface": "",

2787

1735

"port": "",

2788

1736

"debug": "False",

2789

1737

"priority":

2790

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

2791

":+SIGN-DSA-SHA256",

1738

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

2792

1739

"servicename": "Mandos",

2793

1740

"use_dbus": "True",

2794

1741

"use_ipv6": "True",

2795

1742

"debuglevel": "",

2796

"restore": "True",

2797

"socket": "",

2798

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

2799

"foreground": "False",

2800

"zeroconf": "True",

2801

}

1743

}

2802

1744

2803

1745

# Parse config file for server-global settings

2804

1746

server_config = configparser.SafeConfigParser(server_defaults)

2805

1747

del server_defaults

2806

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

1748

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

1749

"mandos.conf"))

2807

1750

# Convert the SafeConfigParser object to a dict

2808

1751

server_settings = server_config.defaults()

2809

1752

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

2810

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

1753

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

2811

1754

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

2812

1755

option)

2813

1756

if server_settings["port"]:

2814

1757

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

2815

1758

"port")

2816

if server_settings["socket"]:

2817

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

2818

"socket")

2819

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

2820

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

2821

# happen with a supplied network socket.

2822

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

2823

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

2824

["socket"])

2825

1759

del server_config

2826

1760

2827

1761

# Override the settings from the config file with command line

2828

1762

# options, if set.

2829

1763

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

2830

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

2831

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

2832

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

1764

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

1765

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

2833

1766

value = getattr(options, option)

2834

1767

if value is not None:

2835

1768

server_settings[option] = value

2836

1769

del options

2837

1770

# Force all strings to be unicode

2838

1771

for option in server_settings.keys():

2839

if isinstance(server_settings[option], bytes):

2840

server_settings[option] = (server_settings[option]

2841

.decode("utf-8"))

2842

# Force all boolean options to be boolean

2843

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

2844

"foreground", "zeroconf"):

2845

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

2846

# Debug implies foreground

2847

if server_settings["debug"]:

2848

server_settings["foreground"] = True

1772

if type(server_settings[option]) is str:

1773

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

2849

1774

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

2850

1775

2851

1776

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

2852

1777

2853

if (not server_settings["zeroconf"]

2854

and not (server_settings["port"]

2855

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

2856

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

2857

2858

1778

# For convenience

2859

1779

debug = server_settings["debug"]

2860

1780

debuglevel = server_settings["debuglevel"]

2861

1781

use_dbus = server_settings["use_dbus"]

2862

1782

use_ipv6 = server_settings["use_ipv6"]

2863

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

2864

stored_state_file)

2865

foreground = server_settings["foreground"]

2866

zeroconf = server_settings["zeroconf"]

2867

2868

if debug:

2869

initlogger(debug, logging.DEBUG)

2870

else:

2871

if not debuglevel:

2872

initlogger(debug)

2873

else:

2874

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

2875

initlogger(debug, level)

2876

1783

2877

1784

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

2878

syslogger.setFormatter(

2879

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

2880

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

2881

server_settings["servicename"])))

1785

syslogger.setFormatter(logging.Formatter

1786

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

1787

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

1788

% server_settings["servicename"]))

2882

1789

2883

1790

# Parse config file with clients

2884

client_config = configparser.SafeConfigParser(Client

2885

.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)

2886

1799

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

2887

1800

"clients.conf"))

2888

1801

2889

1802

global mandos_dbus_service

2890

1803

mandos_dbus_service = None

2891

1804

2892

socketfd = None

2893

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

2894

socketfd = server_settings["socket"]

2895

tcp_server = MandosServer(

2896

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

2897

ClientHandler,

2898

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

2899

use_ipv6=use_ipv6,

2900

gnutls_priority=server_settings["priority"],

2901

use_dbus=use_dbus,

2902

socketfd=socketfd)

2903

if not foreground:

2904

pidfilename = "/run/mandos.pid"

2905

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

2906

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

2907

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"

2908

1816

try:

2909

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

2910

except IOError as e:

2911

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

2912

exc_info=e)

1817

pidfile = open(pidfilename, "w")

1818

except IOError:

1819

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

2913

1820

2914

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:

2915

1825

try:

2916

uid = pwd.getpwnam(name).pw_uid

2917

gid = pwd.getpwnam(name).pw_gid

2918

break

1826

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

1827

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

2919

1828

except KeyError:

2920

continue

2921

else:

2922

uid = 65534

2923

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

2924

1835

try:

2925

1836

os.setgid(gid)

2926

1837

os.setuid(uid)

2927

1838

except OSError as error:

2928

if error.errno != errno.EPERM:

2929

raise

1839

if error[0] != errno.EPERM:

1840

raise error

2930

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

2931

1850

if debug:

2932

1851

# Enable all possible GnuTLS debugging

2933

1852

2934

1853

# "Use a log level over 10 to enable all debugging options."

2935

1854

# - GnuTLS manual

2936

gnutls.global_set_log_level(11)

1855

gnutls.library.functions.gnutls_global_set_log_level(11)

2937

1856

2938

@gnutls.log_func

1857

@gnutls.library.types.gnutls_log_func

2939

1858

def debug_gnutls(level, string):

2940

1859

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

2941

1860

2942

gnutls.global_set_log_function(debug_gnutls)

1861

(gnutls.library.functions

1862

.gnutls_global_set_log_function(debug_gnutls))

2943

1863

2944

1864

# Redirect stdin so all checkers get /dev/null

2945

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

1865

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

2946

1866

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

2947

1867

if null > 2:

2948

1868

os.close(null)

1869

else:

1870

# No console logging

1871

logger.removeHandler(console)

2949

1872

2950

1873

# Need to fork before connecting to D-Bus

2951

if not foreground:

1874

if not debug:

2952

1875

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

2953

1876

daemon()

2954

1877

2955

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

2956

# need to inform gobject that threads will be used.

2957

gobject.threads_init()

2958

2959

1878

global main_loop

2960

1879

# From the Avahi example code

2961

DBusGMainLoop(set_as_default=True)

1880

DBusGMainLoop(set_as_default=True )

2962

1881

main_loop = gobject.MainLoop()

2963

1882

bus = dbus.SystemBus()

2964

1883

# End of Avahi example code

2965

1884

if use_dbus:

2966

1885

try:

2967

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

2968

bus,

2969

do_not_queue=True)

2970

old_bus_name = dbus.service.BusName(

2971

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

2972

do_not_queue=True)

2973

except dbus.exceptions.DBusException as e:

2974

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")

2975

1890

use_dbus = False

2976

1891

server_settings["use_dbus"] = False

2977

1892

tcp_server.use_dbus = False

2978

if zeroconf:

2979

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2980

service = AvahiServiceToSyslog(

2981

name = server_settings["servicename"],

2982

servicetype = "_mandos._tcp",

2983

protocol = protocol,

2984

bus = bus)

2985

if server_settings["interface"]:

2986

service.interface = if_nametoindex(

2987

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"])))

2988

1900

2989

1901

global multiprocessing_manager

2990

1902

multiprocessing_manager = multiprocessing.Manager()

2992

1904

client_class = Client

2993

1905

if use_dbus:

2994

1906

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

2995

2996

client_settings = Client.config_parser(client_config)

2997

old_client_settings = {}

2998

clients_data = {}

2999

3000

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

3001

global wnull

3002

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

3003

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

3004

# mode

3005

if debug or not foreground:

3006

wnull.close()

3007

3008

# Get client data and settings from last running state.

3009

if server_settings["restore"]:

3010

try:

3011

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

3012

clients_data, old_client_settings = pickle.load(

3013

stored_state)

3014

os.remove(stored_state_path)

3015

except IOError as e:

3016

if e.errno == errno.ENOENT:

3017

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

3018

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

3019

else:

3020

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

3021

exc_info=e)

3022

raise

3023

except EOFError as e:

3024

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

3025

"EOFError:",

3026

exc_info=e)

3027

3028

with PGPEngine() as pgp:

3029

for client_name, client in clients_data.items():

3030

# Skip removed clients

3031

if client_name not in client_settings:

3032

continue

3033

3034

# Decide which value to use after restoring saved state.

3035

# We have three different values: Old config file,

3036

# new config file, and saved state.

3037

# New config value takes precedence if it differs from old

3038

# config value, otherwise use saved state.

3039

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

3040

try:

3041

# For each value in new config, check if it

3042

# differs from the old config value (Except for

3043

# the "secret" attribute)

3044

if (name != "secret"

3045

and (value !=

3046

old_client_settings[client_name][name])):

3047

client[name] = value

3048

except KeyError:

3049

pass

3050

3051

# Clients who has passed its expire date can still be

3052

# enabled if its last checker was successful. A Client

3053

# whose checker succeeded before we stored its state is

3054

# assumed to have successfully run all checkers during

3055

# downtime.

3056

if client["enabled"]:

3057

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

3058

if not client["last_checked_ok"]:

3059

logger.warning(

3060

"disabling client {} - Client never "

3061

"performed a successful checker".format(

3062

client_name))

3063

client["enabled"] = False

3064

elif client["last_checker_status"] != 0:

3065

logger.warning(

3066

"disabling client {} - Client last"

3067

" checker failed with error code"

3068

" {}".format(

3069

client_name,

3070

client["last_checker_status"]))

3071

client["enabled"] = False

3072

else:

3073

client["expires"] = (

3074

datetime.datetime.utcnow()

3075

+ client["timeout"])

3076

logger.debug("Last checker succeeded,"

3077

" keeping {} enabled".format(

3078

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):

3079

1914

try:

3080

client["secret"] = pgp.decrypt(

3081

client["encrypted_secret"],

3082

client_settings[client_name]["secret"])

3083

except PGPError:

3084

# If decryption fails, we use secret from new settings

3085

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

3086

client_name))

3087

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

3088

["secret"])

3089

3090

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

3091

for client_name in (set(old_client_settings)

3092

- set(client_settings)):

3093

del clients_data[client_name]

3094

for client_name in (set(client_settings)

3095

- set(old_client_settings)):

3096

clients_data[client_name] = client_settings[client_name]

3097

3098

# Create all client objects

3099

for client_name, client in clients_data.items():

3100

tcp_server.clients[client_name] = client_class(

3101

name = client_name,

3102

settings = client,

3103

server_settings = server_settings)

3104

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()))

3105

1924

if not tcp_server.clients:

3106

1925

logger.warning("No clients defined")

3107

3108

if not foreground:

3109

if pidfile is not None:

3110

pid = os.getpid()

3111

try:

3112

with pidfile:

3113

print(pid, file=pidfile)

3114

except IOError:

3115

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

3116

pidfilename, pid)

3117

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

3118

1939

del pidfilename

3119

1940

1941

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

1942

3120

1943

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

3121

1944

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

3122

1945

3123

1946

if use_dbus:

3124

3125

@alternate_dbus_interfaces(

3126

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

3127

class MandosDBusService(DBusObjectWithObjectManager):

1947

class MandosDBusService(dbus.service.Object):

3128

1948

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

3129

3130

1949

def __init__(self):

3131

1950

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

3132

3133

_interface = "se.recompile.Mandos"

1951

_interface = "se.bsnet.fukt.Mandos"

3134

1952

3135

1953

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

3136

1954

def ClientAdded(self, objpath):

3142

1960

"D-Bus signal"

3143

1961

pass

3144

1962

3145

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

3146

"true"})

3147

1963

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

3148

1964

def ClientRemoved(self, objpath, name):

3149

1965

"D-Bus signal"

3150

1966

pass

3151

1967

3152

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

3153

"true"})

3154

1968

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

3155

1969

def GetAllClients(self):

3156

1970

"D-Bus method"

3157

return dbus.Array(c.dbus_object_path for c in

3158

tcp_server.clients.itervalues())

1971

return dbus.Array(c.dbus_object_path

1972

for c in tcp_server.clients)

3159

1973

3160

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

3161

"true"})

3162

1974

@dbus.service.method(_interface,

3163

1975

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

3164

1976

def GetAllClientsWithProperties(self):

3165

1977

"D-Bus method"

3166

1978

return dbus.Dictionary(

3167

{ c.dbus_object_path: c.GetAll(

3168

"se.recompile.Mandos.Client")

3169

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

1979

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

1980

for c in tcp_server.clients),

3170

1981

signature="oa{sv}")

3171

1982

3172

1983

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

3173

1984

def RemoveClient(self, object_path):

3174

1985

"D-Bus method"

3175

for c in tcp_server.clients.itervalues():

1986

for c in tcp_server.clients:

3176

1987

if c.dbus_object_path == object_path:

3177

del tcp_server.clients[c.name]

1988

tcp_server.clients.remove(c)

3178

1989

c.remove_from_connection()

3179

# Don't signal the disabling

1990

# Don't signal anything except ClientRemoved

3180

1991

c.disable(quiet=True)

3181

# Emit D-Bus signal for removal

3182

self.client_removed_signal(c)

1992

# Emit D-Bus signal

1993

self.ClientRemoved(object_path, c.name)

3183

1994

return

3184

1995

raise KeyError(object_path)

3185

1996

3186

1997

del _interface

3187

3188

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

3189

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

3190

def GetManagedObjects(self):

3191

"""D-Bus method"""

3192

return dbus.Dictionary(

3193

{ client.dbus_object_path:

3194

dbus.Dictionary(

3195

{ interface: client.GetAll(interface)

3196

for interface in

3197

client._get_all_interface_names()})

3198

for client in tcp_server.clients.values()})

3199

3200

def client_added_signal(self, client):

3201

"""Send the new standard signal and the old signal"""

3202

if use_dbus:

3203

# New standard signal

3204

self.InterfacesAdded(

3205

client.dbus_object_path,

3206

dbus.Dictionary(

3207

{ interface: client.GetAll(interface)

3208

for interface in

3209

client._get_all_interface_names()}))

3210

# Old signal

3211

self.ClientAdded(client.dbus_object_path)

3212

3213

def client_removed_signal(self, client):

3214

"""Send the new standard signal and the old signal"""

3215

if use_dbus:

3216

# New standard signal

3217

self.InterfacesRemoved(

3218

client.dbus_object_path,

3219

client._get_all_interface_names())

3220

# Old signal

3221

self.ClientRemoved(client.dbus_object_path,

3222

client.name)

3223

1998

3224

1999

mandos_dbus_service = MandosDBusService()

3225

2000

3226

2001

def cleanup():

3227

2002

"Cleanup function; run on exit"

3228

if zeroconf:

3229

service.cleanup()

3230

3231

multiprocessing.active_children()

3232

wnull.close()

3233

if not (tcp_server.clients or client_settings):

3234

return

3235

3236

# Store client before exiting. Secrets are encrypted with key

3237

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

3238

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

3239

clients = {}

3240

with PGPEngine() as pgp:

3241

for client in tcp_server.clients.itervalues():

3242

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

3243

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

3244

key)

3245

client_dict = {}

3246

3247

# A list of attributes that can not be pickled

3248

# + secret.

3249

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

3250

"checker", "server_settings" }

3251

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

3252

.Object):

3253

exclude.add(name)

3254

3255

client_dict["encrypted_secret"] = (client

3256

.encrypted_secret)

3257

for attr in client.client_structure:

3258

if attr not in exclude:

3259

client_dict[attr] = getattr(client, attr)

3260

3261

clients[client.name] = client_dict

3262

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

3263

3264

try:

3265

with tempfile.NamedTemporaryFile(

3266

mode='wb',

3267

suffix=".pickle",

3268

prefix='clients-',

3269

dir=os.path.dirname(stored_state_path),

3270

delete=False) as stored_state:

3271

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

3272

tempname = stored_state.name

3273

os.rename(tempname, stored_state_path)

3274

except (IOError, OSError) as e:

3275

if not debug:

3276

try:

3277

os.remove(tempname)

3278

except NameError:

3279

pass

3280

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

3281

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

3282

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

3283

else:

3284

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

3285

exc_info=e)

3286

raise

3287

3288

# Delete all clients, and settings from config

2003

service.cleanup()

2004

3289

2005

while tcp_server.clients:

3290

name, client = tcp_server.clients.popitem()

2006

client = tcp_server.clients.pop()

3291

2007

if use_dbus:

3292

2008

client.remove_from_connection()

3293

# Don't signal the disabling

2009

client.disable_hook = None

2010

# Don't signal anything except ClientRemoved

3294

2011

client.disable(quiet=True)

3295

# Emit D-Bus signal for removal

3296

2012

if use_dbus:

3297

mandos_dbus_service.client_removed_signal(client)

3298

client_settings.clear()

2013

# Emit D-Bus signal

2014

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2015

client.name)

3299

2016

3300

2017

atexit.register(cleanup)

3301

2018

3302

for client in tcp_server.clients.itervalues():

2019

for client in tcp_server.clients:

3303

2020

if use_dbus:

3304

# Emit D-Bus signal for adding

3305

mandos_dbus_service.client_added_signal(client)

3306

# Need to initiate checking of clients

3307

if client.enabled:

3308

client.init_checker()

2021

# Emit D-Bus signal

2022

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2023

client.enable()

3309

2024

3310

2025

tcp_server.enable()

3311

2026

tcp_server.server_activate()

3312

2027

3313

2028

# Find out what port we got

3314

if zeroconf:

3315

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

2029

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

3316

2030

if use_ipv6:

3317

2031

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

3318

" flowinfo %d, scope_id %d",

3319

*tcp_server.socket.getsockname())

2032

" flowinfo %d, scope_id %d"

2033

% tcp_server.socket.getsockname())

3320

2034

else: # IPv4

3321

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

3322

*tcp_server.socket.getsockname())

2035

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

2036

% tcp_server.socket.getsockname())

3323

2037

3324

2038

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

3325

2039

3326

2040

try:

3327

if zeroconf:

3328

# From the Avahi example code

3329

try:

3330

service.activate()

3331

except dbus.exceptions.DBusException as error:

3332

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

3333

cleanup()

3334

sys.exit(1)

3335

# 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

3336

2049

3337

2050

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

3338

2051

lambda *args, **kwargs:

3342

2055

logger.debug("Starting main loop")

3343

2056

main_loop.run()

3344

2057

except AvahiError as error:

3345

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

2058

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

3346

2059

cleanup()

3347

2060

sys.exit(1)

3348

2061

except KeyboardInterrupt:

3353

2066

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

3354

2067

cleanup()

3355

2068

3356

3357

2069

if __name__ == '__main__':

3358

2070

main()