/mandos/release : revision 237.7.33

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#!/usr/bin/python2.7

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#!/usr/bin/python

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

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#

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

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

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#

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# Everything else is

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#

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

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

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# along with this program. If not, see

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

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#

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

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

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#

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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from future_builtins import *

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try:

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import SocketServer as socketserver

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except ImportError:

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import socketserver

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import SocketServer as socketserver

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import socket

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import argparse

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import datetime

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import gnutls.library.functions

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import gnutls.library.constants

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import gnutls.library.types

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try:

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import ConfigParser as configparser

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except ImportError:

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import configparser

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import ConfigParser as configparser

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import sys

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import re

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import os

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import struct

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import fcntl

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import functools

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try:

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import cPickle as pickle

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except ImportError:

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import pickle

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import cPickle as pickle

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import multiprocessing

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import types

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import binascii

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import tempfile

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import itertools

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import collections

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import codecs

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import dbus

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import dbus.service

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try:

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import gobject

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except ImportError:

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from gi.repository import GObject as gobject

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import gobject

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import avahi

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from dbus.mainloop.glib import DBusGMainLoop

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import ctypes

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except ImportError:

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SO_BINDTODEVICE = None

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if sys.version_info.major == 2:

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str = unicode

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version = "1.6.9"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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syslogger = None

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try:

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if_nametoindex = ctypes.cdll.LoadLibrary(

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

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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

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

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

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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struct.pack(b"16s16x", interface))

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interface_index = struct.unpack("I", ifreq[16:20])[0]

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return interface_index

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

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"""init logger and add loglevel"""

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global syslogger

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syslogger = (logging.handlers.SysLogHandler(

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facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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address = "/dev/log"))

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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

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pass

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class PGPEngine(object):

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

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def __init__(self):

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

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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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def __enter__(self):

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return self

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

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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

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topdown = False):

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for filename in files:

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

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for dirname in dirs:

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

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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

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

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

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if len(encoded) > 2048:

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

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

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

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

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return encoded

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def encrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(

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dir=self.tempdir) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(

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dir = self.tempdir) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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version = "1.3.0"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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class AvahiError(Exception):

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

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self.value = value

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

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**kwargs)

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

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def __unicode__(self):

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return unicode(repr(self.value))

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class AvahiServiceError(AvahiError):

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pass

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class AvahiGroupError(AvahiError):

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pass

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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def __init__(self,

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interface = avahi.IF_UNSPEC,

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name = None,

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servicetype = None,

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port = None,

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TXT = None,

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domain = "",

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host = "",

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max_renames = 32768,

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protocol = avahi.PROTO_UNSPEC,

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bus = None):

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

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

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

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protocol = avahi.PROTO_UNSPEC, bus = None):

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self.interface = interface

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self.name = name

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self.type = servicetype

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self, remove=True):

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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

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" after %i retries, exiting.",

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self.rename_count)

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raise AvahiServiceError("Too many renames")

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self.name = str(

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self.server.GetAlternativeServiceName(self.name))

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self.rename_count += 1

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

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

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self.name)

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if remove:

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self.remove()

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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if (error.get_dbus_name()

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

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

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return self.rename(remove=False)

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else:

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

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self.cleanup()

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os._exit(1)

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.entry_group_state_changed_match = (

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self.group.connect_to_signal(

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'StateChanged', self.entry_group_state_changed))

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'StateChanged', self .entry_group_state_changed))

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

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self.name, self.type)

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self.group.AddService(

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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self.rename()

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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str(error))

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

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unicode(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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def cleanup(self):

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

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException):

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dbus.exceptions.DBusException) as e:

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pass

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self.group = None

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self.remove()

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

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

383

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

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bad_states = {

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avahi.SERVER_INVALID: "Zeroconf server invalid",

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avahi.SERVER_REGISTERING: None,

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avahi.SERVER_COLLISION: "Zeroconf server name collision",

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avahi.SERVER_FAILURE: "Zeroconf server failure",

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}

233

bad_states = { avahi.SERVER_INVALID:

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"Zeroconf server invalid",

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avahi.SERVER_REGISTERING: None,

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avahi.SERVER_COLLISION:

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"Zeroconf server name collision",

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avahi.SERVER_FAILURE:

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"Zeroconf server failure" }

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if state in bad_states:

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if bad_states[state] is not None:

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if error is None:

401

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

402

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else:

403

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

404

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def activate(self):

406

255

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

407

256

if self.server is None:

411

260

follow_name_owner_changes=True),

412

261

avahi.DBUS_INTERFACE_SERVER)

413

262

self.server.connect_to_signal("StateChanged",

414

self.server_state_changed)

263

self.server_state_changed)

415

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

416

265

417

266

418

class AvahiServiceToSyslog(AvahiService):

419

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

420

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

421

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

422

syslogger.setFormatter(logging.Formatter(

423

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

424

.format(self.name)))

425

return ret

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427

428

267

class Client(object):

429

268

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

430

269

431

270

Attributes:

432

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

271

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

433

272

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

434

273

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

435

274

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

442

281

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

443

282

checker_initiator_tag: a gobject event source tag, or None

444

283

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

445

client_structure: Object describing what attributes a client has

446

and is used for storing the client at exit

447

284

current_checker_command: string; current running checker_command

285

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

448

286

disable_initiator_tag: a gobject event source tag, or None

449

287

enabled: bool()

450

288

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

453

291

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

454

292

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

455

293

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

456

last_checker_status: integer between 0 and 255 reflecting exit

457

status of last checker. -1 reflects crashed

458

checker, -2 means no checker completed yet.

459

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

294

last_enabled: datetime.datetime(); (UTC)

460

295

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

461

296

D-Bus identifiers

462

297

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

463

298

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

464

299

until this client is disabled

465

extended_timeout: extra long timeout when secret has been sent

466

300

runtime_expansions: Allowed attributes for runtime expansion.

467

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

468

disabled, or None

469

server_settings: The server_settings dict from main()

470

301

"""

471

302

472

303

runtime_expansions = ("approval_delay", "approval_duration",

473

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

474

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

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"last_approval_request", "last_checked_ok",

304

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

305

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

476

306

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

477

client_defaults = {

478

"timeout": "PT5M",

479

"extended_timeout": "PT15M",

480

"interval": "PT2M",

481

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

482

"host": "",

483

"approval_delay": "PT0S",

484

"approval_duration": "PT1S",

485

"approved_by_default": "True",

486

"enabled": "True",

487

}

488

307

489

308

@staticmethod

490

def config_parser(config):

491

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

492

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

493

with exceptions for any special settings as defined above.

494

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

495

value given the same arguments.

496

"""

497

settings = {}

498

for client_name in config.sections():

499

section = dict(config.items(client_name))

500

client = settings[client_name] = {}

501

502

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

503

# Reformat values from string types to Python types

504

client["approved_by_default"] = config.getboolean(

505

client_name, "approved_by_default")

506

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

507

"enabled")

508

509

# Uppercase and remove spaces from fingerprint for later

510

# comparison purposes with return value from the

511

# fingerprint() function

512

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

513

.replace(" ", ""))

514

if "secret" in section:

515

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

516

elif "secfile" in section:

517

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

518

(section["secfile"])),

519

"rb") as secfile:

520

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

521

else:

522

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

523

.format(section))

524

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

525

client["extended_timeout"] = string_to_delta(

526

section["extended_timeout"])

527

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

528

client["approval_delay"] = string_to_delta(

529

section["approval_delay"])

530

client["approval_duration"] = string_to_delta(

531

section["approval_duration"])

532

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

533

client["last_approval_request"] = None

534

client["last_checked_ok"] = None

535

client["last_checker_status"] = -2

536

537

return settings

538

539

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

309

def _timedelta_to_milliseconds(td):

310

"Convert a datetime.timedelta() to milliseconds"

311

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

312

+ (td.seconds * 1000)

313

+ (td.microseconds // 1000))

314

315

def timeout_milliseconds(self):

316

"Return the 'timeout' attribute in milliseconds"

317

return self._timedelta_to_milliseconds(self.timeout)

318

319

def interval_milliseconds(self):

320

"Return the 'interval' attribute in milliseconds"

321

return self._timedelta_to_milliseconds(self.interval)

322

323

def approval_delay_milliseconds(self):

324

return self._timedelta_to_milliseconds(self.approval_delay)

325

326

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

327

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

328

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

329

attribute."""

540

330

self.name = name

541

if server_settings is None:

542

server_settings = {}

543

self.server_settings = server_settings

544

# adding all client settings

545

for setting, value in settings.items():

546

setattr(self, setting, value)

547

548

if self.enabled:

549

if not hasattr(self, "last_enabled"):

550

self.last_enabled = datetime.datetime.utcnow()

551

if not hasattr(self, "expires"):

552

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

553

+ self.timeout)

554

else:

555

self.last_enabled = None

556

self.expires = None

557

331

if config is None:

332

config = {}

558

333

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

334

# Uppercase and remove spaces from fingerprint for later

335

# comparison purposes with return value from the fingerprint()

336

# function

337

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

338

.replace(" ", ""))

559

339

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

560

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

561

datetime.datetime.utcnow())

562

563

# attributes specific for this server instance

340

if "secret" in config:

341

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

342

elif "secfile" in config:

343

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

344

(config["secfile"])),

345

"rb") as secfile:

346

self.secret = secfile.read()

347

else:

348

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

349

% self.name)

350

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

351

self.created = datetime.datetime.utcnow()

352

self.enabled = False

353

self.last_approval_request = None

354

self.last_enabled = None

355

self.last_checked_ok = None

356

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

357

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

358

self.disable_hook = disable_hook

564

359

self.checker = None

565

360

self.checker_initiator_tag = None

566

361

self.disable_initiator_tag = None

567

362

self.checker_callback_tag = None

363

self.checker_command = config["checker"]

568

364

self.current_checker_command = None

569

self.approved = None

365

self.last_connect = None

366

self._approved = None

367

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

368

True)

570

369

self.approvals_pending = 0

571

self.changedstate = multiprocessing_manager.Condition(

572

multiprocessing_manager.Lock())

573

self.client_structure = [attr

574

for attr in self.__dict__.iterkeys()

575

if not attr.startswith("_")]

576

self.client_structure.append("client_structure")

577

578

for name, t in inspect.getmembers(

579

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

580

if not name.startswith("_"):

581

self.client_structure.append(name)

370

self.approval_delay = string_to_delta(

371

config["approval_delay"])

372

self.approval_duration = string_to_delta(

373

config["approval_duration"])

374

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

582

375

583

# Send notice to process children that client state has changed

584

376

def send_changedstate(self):

585

with self.changedstate:

586

self.changedstate.notify_all()

587

377

self.changedstate.acquire()

378

self.changedstate.notify_all()

379

self.changedstate.release()

380

588

381

def enable(self):

589

382

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

590

383

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

591

384

# Already enabled

592

385

return

593

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

594

self.enabled = True

386

self.send_changedstate()

595

387

self.last_enabled = datetime.datetime.utcnow()

596

self.init_checker()

597

self.send_changedstate()

388

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

389

# and every interval from then on.

390

self.checker_initiator_tag = (gobject.timeout_add

391

(self.interval_milliseconds(),

392

self.start_checker))

393

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

394

self.disable_initiator_tag = (gobject.timeout_add

395

(self.timeout_milliseconds(),

396

self.disable))

397

self.enabled = True

398

# Also start a new checker *right now*.

399

self.start_checker()

598

400

599

401

def disable(self, quiet=True):

600

402

"""Disable this client."""

601

403

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

602

404

return False

603

405

if not quiet:

406

self.send_changedstate()

407

if not quiet:

604

408

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

605

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

409

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

606

410

gobject.source_remove(self.disable_initiator_tag)

607

411

self.disable_initiator_tag = None

608

self.expires = None

609

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

412

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

610

413

gobject.source_remove(self.checker_initiator_tag)

611

414

self.checker_initiator_tag = None

612

415

self.stop_checker()

416

if self.disable_hook:

417

self.disable_hook(self)

613

418

self.enabled = False

614

if not quiet:

615

self.send_changedstate()

616

419

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

617

420

return False

618

421

619

422

def __del__(self):

423

self.disable_hook = None

620

424

self.disable()

621

425

622

def init_checker(self):

623

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

624

# and every interval from then on.

625

if self.checker_initiator_tag is not None:

626

gobject.source_remove(self.checker_initiator_tag)

627

self.checker_initiator_tag = gobject.timeout_add(

628

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

629

self.start_checker)

630

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

631

if self.disable_initiator_tag is not None:

632

gobject.source_remove(self.disable_initiator_tag)

633

self.disable_initiator_tag = gobject.timeout_add(

634

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

635

# Also start a new checker *right now*.

636

self.start_checker()

637

638

426

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

639

427

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

640

428

self.checker_callback_tag = None

641

429

self.checker = None

642

430

if os.WIFEXITED(condition):

643

self.last_checker_status = os.WEXITSTATUS(condition)

644

if self.last_checker_status == 0:

431

exitstatus = os.WEXITSTATUS(condition)

432

if exitstatus == 0:

645

433

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

646

434

vars(self))

647

435

self.checked_ok()

648

436

else:

649

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

437

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

438

vars(self))

650

439

else:

651

self.last_checker_status = -1

652

440

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

653

441

vars(self))

654

442

655

443

def checked_ok(self):

656

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

444

"""Bump up the timeout for this client.

445

446

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

447

alive and well.

448

"""

657

449

self.last_checked_ok = datetime.datetime.utcnow()

658

self.last_checker_status = 0

659

self.bump_timeout()

660

661

def bump_timeout(self, timeout=None):

662

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

663

if timeout is None:

664

timeout = self.timeout

665

if self.disable_initiator_tag is not None:

666

gobject.source_remove(self.disable_initiator_tag)

667

self.disable_initiator_tag = None

668

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

669

self.disable_initiator_tag = gobject.timeout_add(

670

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

671

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

450

gobject.source_remove(self.disable_initiator_tag)

451

self.disable_initiator_tag = (gobject.timeout_add

452

(self.timeout_milliseconds(),

453

self.disable))

672

454

673

455

def need_approval(self):

674

456

self.last_approval_request = datetime.datetime.utcnow()

679

461

If a checker already exists, leave it running and do

680

462

nothing."""

681

463

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

682

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

683

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

684

# would inevitably timeout, since no checker would get a

685

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

464

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

465

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

466

# client would inevitably timeout, since no checker would get

467

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

686

468

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

687

469

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

688

470

# should be.

690

472

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

691

473

try:

692

474

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

693

except AttributeError:

694

pass

695

except OSError as error:

696

if error.errno != errno.ECHILD:

697

raise

475

except (AttributeError, OSError) as error:

476

if (isinstance(error, OSError)

477

and error.errno != errno.ECHILD):

478

raise error

698

479

else:

699

480

if pid:

700

481

logger.warning("Checker was a zombie")

703

484

self.current_checker_command)

704

485

# Start a new checker if needed

705

486

if self.checker is None:

706

# Escape attributes for the shell

707

escaped_attrs = {

708

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

709

for attr in self.runtime_expansions }

710

487

try:

711

command = self.checker_command % escaped_attrs

712

except TypeError as error:

713

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

714

self.checker_command,

715

exc_info=error)

716

return True # Try again later

488

# In case checker_command has exactly one % operator

489

command = self.checker_command % self.host

490

except TypeError:

491

# Escape attributes for the shell

492

escaped_attrs = dict(

493

(attr,

494

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

495

errors=

496

'replace')))

497

for attr in

498

self.runtime_expansions)

499

500

try:

501

command = self.checker_command % escaped_attrs

502

except TypeError as error:

503

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

504

' %s', self.checker_command, error)

505

return True # Try again later

717

506

self.current_checker_command = command

718

507

try:

719

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

720

self.name)

508

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

509

command, self.name)

721

510

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

722

511

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

723

512

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

724

513

# always replaced by /dev/null.)

725

# The exception is when not debugging but nevertheless

726

# running in the foreground; use the previously

727

# created wnull.

728

popen_args = {}

729

if (not self.server_settings["debug"]

730

and self.server_settings["foreground"]):

731

popen_args.update({"stdout": wnull,

732

"stderr": wnull })

733

514

self.checker = subprocess.Popen(command,

734

515

close_fds=True,

735

shell=True,

736

cwd="/",

737

**popen_args)

738

except OSError as error:

739

logger.error("Failed to start subprocess",

740

exc_info=error)

741

return True

742

self.checker_callback_tag = gobject.child_watch_add(

743

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

744

# The checker may have completed before the gobject

745

# watch was added. Check for this.

746

try:

516

shell=True, cwd="/")

517

self.checker_callback_tag = (gobject.child_watch_add

518

(self.checker.pid,

519

self.checker_callback,

520

data=command))

521

# The checker may have completed before the gobject

522

# watch was added. Check for this.

747

523

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

524

if pid:

525

gobject.source_remove(self.checker_callback_tag)

526

self.checker_callback(pid, status, command)

748

527

except OSError as error:

749

if error.errno == errno.ECHILD:

750

# This should never happen

751

logger.error("Child process vanished",

752

exc_info=error)

753

return True

754

raise

755

if pid:

756

gobject.source_remove(self.checker_callback_tag)

757

self.checker_callback(pid, status, command)

528

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

529

error)

758

530

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

759

531

return True

760

532

767

539

return

768

540

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

769

541

try:

770

self.checker.terminate()

542

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

771

543

#time.sleep(0.5)

772

544

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

773

# self.checker.kill()

545

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

774

546

except OSError as error:

775

547

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

776

548

raise

777

549

self.checker = None

778

550

779

780

def dbus_service_property(dbus_interface,

781

signature="v",

782

access="readwrite",

783

byte_arrays=False):

551

def dbus_service_property(dbus_interface, signature="v",

552

access="readwrite", byte_arrays=False):

784

553

"""Decorators for marking methods of a DBusObjectWithProperties to

785

554

become properties on the D-Bus.

786

555

795

564

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

796

565

if byte_arrays and signature != "ay":

797

566

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

798

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

799

567

" signature %r" % signature)

800

568

def decorator(func):

801

569

func._dbus_is_property = True

802

570

func._dbus_interface = dbus_interface

807

575

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

808

576

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

809

577

return func

810

811

return decorator

812

813

814

def dbus_interface_annotations(dbus_interface):

815

"""Decorator for marking functions returning interface annotations

816

817

Usage:

818

819

@dbus_interface_annotations("org.example.Interface")

820

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

821

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

822

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

823

"false"}

824

"""

825

826

def decorator(func):

827

func._dbus_is_interface = True

828

func._dbus_interface = dbus_interface

829

func._dbus_name = dbus_interface

830

return func

831

832

return decorator

833

834

835

def dbus_annotations(annotations):

836

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

837

Usage:

838

839

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

840

"org.freedesktop.DBus.Property."

841

"EmitsChangedSignal": "false"})

842

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

843

access="r")

844

def Property_dbus_property(self):

845

return dbus.Boolean(False)

846

"""

847

848

def decorator(func):

849

func._dbus_annotations = annotations

850

return func

851

852

578

return decorator

853

579

854

580

855

581

class DBusPropertyException(dbus.exceptions.DBusException):

856

582

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

857

583

"""

858

pass

584

def __unicode__(self):

585

return unicode(str(self))

859

586

860

587

861

588

class DBusPropertyAccessException(DBusPropertyException):

872

599

873

600

class DBusObjectWithProperties(dbus.service.Object):

874

601

"""A D-Bus object with properties.

875

602

876

603

Classes inheriting from this can use the dbus_service_property

877

604

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

878

605

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

879

606

"""

880

607

881

608

@staticmethod

882

def _is_dbus_thing(thing):

883

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

884

885

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

886

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

887

"""

888

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

889

False)

609

def _is_dbus_property(obj):

610

return getattr(obj, "_dbus_is_property", False)

890

611

891

def _get_all_dbus_things(self, thing):

612

def _get_all_dbus_properties(self):

892

613

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

893

614

"""

894

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

895

athing.__get__(self))

896

for cls in self.__class__.__mro__

897

for name, athing in

898

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

615

return ((prop._dbus_name, prop)

616

for name, prop in

617

inspect.getmembers(self, self._is_dbus_property))

899

618

900

619

def _get_dbus_property(self, interface_name, property_name):

901

620

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

902

621

property with the specified name and interface.

903

622

"""

904

for cls in self.__class__.__mro__:

905

for name, value in inspect.getmembers(

906

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

907

if (value._dbus_name == property_name

908

and value._dbus_interface == interface_name):

909

return value.__get__(self)

910

623

for name in (property_name,

624

property_name + "_dbus_property"):

625

prop = getattr(self, name, None)

626

if (prop is None

627

or not self._is_dbus_property(prop)

628

or prop._dbus_name != property_name

629

or (interface_name and prop._dbus_interface

630

and interface_name != prop._dbus_interface)):

631

continue

632

return prop

911

633

# No such property

912

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

913

self.dbus_object_path, interface_name, property_name))

634

raise DBusPropertyNotFound(self.dbus_object_path + ":"

635

+ interface_name + "."

636

+ property_name)

914

637

915

@dbus.service.method(dbus.PROPERTIES_IFACE,

916

in_signature="ss",

638

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

917

639

out_signature="v")

918

640

def Get(self, interface_name, property_name):

919

641

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

937

659

# The byte_arrays option is not supported yet on

938

660

# signatures other than "ay".

939

661

if prop._dbus_signature != "ay":

940

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

941

"'ay' signature {!r}"

942

.format(prop._dbus_signature))

943

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

944

for byte in value))

662

raise ValueError

663

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

664

for byte in value))

945

665

prop(value)

946

666

947

@dbus.service.method(dbus.PROPERTIES_IFACE,

948

in_signature="s",

667

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

949

668

out_signature="a{sv}")

950

669

def GetAll(self, interface_name):

951

670

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

952

671

standard.

953

672

954

673

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

955

674

"""

956

properties = {}

957

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

675

all = {}

676

for name, prop in self._get_all_dbus_properties():

958

677

if (interface_name

959

678

and interface_name != prop._dbus_interface):

960

679

# Interface non-empty but did not match

964

683

continue

965

684

value = prop()

966

685

if not hasattr(value, "variant_level"):

967

properties[name] = value

686

all[name] = value

968

687

continue

969

properties[name] = type(value)(

970

value, variant_level = value.variant_level + 1)

971

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

972

973

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

974

def PropertiesChanged(self, interface_name, changed_properties,

975

invalidated_properties):

976

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

977

standard.

978

"""

979

pass

688

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

689

value.variant_level+1)

690

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

980

691

981

692

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

982

693

out_signature="s",

983

694

path_keyword='object_path',

984

695

connection_keyword='connection')

985

696

def Introspect(self, object_path, connection):

986

"""Overloading of standard D-Bus method.

987

988

Inserts property tags and interface annotation tags.

697

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

989

698

"""

990

699

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

991

700

connection)

992

701

try:

993

702

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

994

995

703

def make_tag(document, name, prop):

996

704

e = document.createElement("property")

997

705

e.setAttribute("name", name)

998

706

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

999

707

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

1000

708

return e

1001

1002

709

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

1003

# Add property tags

1004

710

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

1005

711

for name, prop

1006

in self._get_all_dbus_things("property")

712

in self._get_all_dbus_properties()

1007

713

if prop._dbus_interface

1008

714

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

1009

715

if_tag.appendChild(tag)

1010

# Add annotation tags

1011

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

1012

for tag in if_tag.getElementsByTagName(typ):

1013

annots = dict()

1014

for name, prop in (self.

1015

_get_all_dbus_things(typ)):

1016

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

1017

and prop._dbus_interface

1018

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

1019

annots.update(getattr(

1020

prop, "_dbus_annotations", {}))

1021

for name, value in annots.items():

1022

ann_tag = document.createElement(

1023

"annotation")

1024

ann_tag.setAttribute("name", name)

1025

ann_tag.setAttribute("value", value)

1026

tag.appendChild(ann_tag)

1027

# Add interface annotation tags

1028

for annotation, value in dict(

1029

itertools.chain.from_iterable(

1030

annotations().items()

1031

for name, annotations

1032

in self._get_all_dbus_things("interface")

1033

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

1034

)).items():

1035

ann_tag = document.createElement("annotation")

1036

ann_tag.setAttribute("name", annotation)

1037

ann_tag.setAttribute("value", value)

1038

if_tag.appendChild(ann_tag)

1039

716

# Add the names to the return values for the

1040

717

# "org.freedesktop.DBus.Properties" methods

1041

718

if (if_tag.getAttribute("name")

1056

733

except (AttributeError, xml.dom.DOMException,

1057

734

xml.parsers.expat.ExpatError) as error:

1058

735

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

1059

exc_info=error)

736

error)

1060

737

return xmlstring

1061

738

1062

739

1063

def datetime_to_dbus(dt, variant_level=0):

1064

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

1065

if dt is None:

1066

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

1067

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

1068

1069

1070

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1071

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

1072

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

1073

interface names according to the "alt_interface_names" mapping.

1074

Usage:

1075

1076

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

1077

"net.example.AlternateInterface"})

1078

class SampleDBusObject(dbus.service.Object):

1079

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

1080

def SampleDBusMethod():

1081

pass

1082

1083

The above "SampleDBusMethod" on "SampleDBusObject" will be

1084

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

1085

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

1086

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

1087

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

1088

1089

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

1090

(from DBusObjectWithProperties) and interfaces (from the

1091

dbus_interface_annotations decorator).

1092

"""

1093

1094

def wrapper(cls):

1095

for orig_interface_name, alt_interface_name in (

1096

alt_interface_names.items()):

1097

attr = {}

1098

interface_names = set()

1099

# Go though all attributes of the class

1100

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

1101

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

1102

# with the wrong interface name

1103

if (not hasattr(attribute, "_dbus_interface")

1104

or not attribute._dbus_interface.startswith(

1105

orig_interface_name)):

1106

continue

1107

# Create an alternate D-Bus interface name based on

1108

# the current name

1109

alt_interface = attribute._dbus_interface.replace(

1110

orig_interface_name, alt_interface_name)

1111

interface_names.add(alt_interface)

1112

# Is this a D-Bus signal?

1113

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

1114

# Extract the original non-method undecorated

1115

# function by black magic

1116

nonmethod_func = (dict(

1117

zip(attribute.func_code.co_freevars,

1118

attribute.__closure__))

1119

["func"].cell_contents)

1120

# Create a new, but exactly alike, function

1121

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

1122

# with the alternate D-Bus interface name

1123

new_function = (dbus.service.signal(

1124

alt_interface, attribute._dbus_signature)

1125

(types.FunctionType(

1126

nonmethod_func.func_code,

1127

nonmethod_func.func_globals,

1128

nonmethod_func.func_name,

1129

nonmethod_func.func_defaults,

1130

nonmethod_func.func_closure)))

1131

# Copy annotations, if any

1132

try:

1133

new_function._dbus_annotations = dict(

1134

attribute._dbus_annotations)

1135

except AttributeError:

1136

pass

1137

# Define a creator of a function to call both the

1138

# original and alternate functions, so both the

1139

# original and alternate signals gets sent when

1140

# the function is called

1141

def fixscope(func1, func2):

1142

"""This function is a scope container to pass

1143

func1 and func2 to the "call_both" function

1144

outside of its arguments"""

1145

1146

def call_both(*args, **kwargs):

1147

"""This function will emit two D-Bus

1148

signals by calling func1 and func2"""

1149

func1(*args, **kwargs)

1150

func2(*args, **kwargs)

1151

1152

return call_both

1153

# Create the "call_both" function and add it to

1154

# the class

1155

attr[attrname] = fixscope(attribute, new_function)

1156

# Is this a D-Bus method?

1157

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

1158

# Create a new, but exactly alike, function

1159

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

1160

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

1161

# to the class.

1162

attr[attrname] = (

1163

dbus.service.method(

1164

alt_interface,

1165

attribute._dbus_in_signature,

1166

attribute._dbus_out_signature)

1167

(types.FunctionType(attribute.func_code,

1168

attribute.func_globals,

1169

attribute.func_name,

1170

attribute.func_defaults,

1171

attribute.func_closure)))

1172

# Copy annotations, if any

1173

try:

1174

attr[attrname]._dbus_annotations = dict(

1175

attribute._dbus_annotations)

1176

except AttributeError:

1177

pass

1178

# Is this a D-Bus property?

1179

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

1180

# Create a new, but exactly alike, function

1181

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

1182

# property with the alternate D-Bus interface

1183

# name. Add it to the class.

1184

attr[attrname] = (dbus_service_property(

1185

alt_interface, attribute._dbus_signature,

1186

attribute._dbus_access,

1187

attribute._dbus_get_args_options

1188

["byte_arrays"])

1189

(types.FunctionType(

1190

attribute.func_code,

1191

attribute.func_globals,

1192

attribute.func_name,

1193

attribute.func_defaults,

1194

attribute.func_closure)))

1195

# Copy annotations, if any

1196

try:

1197

attr[attrname]._dbus_annotations = dict(

1198

attribute._dbus_annotations)

1199

except AttributeError:

1200

pass

1201

# Is this a D-Bus interface?

1202

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

1203

# Create a new, but exactly alike, function

1204

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

1205

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

1206

# to the class.

1207

attr[attrname] = (

1208

dbus_interface_annotations(alt_interface)

1209

(types.FunctionType(attribute.func_code,

1210

attribute.func_globals,

1211

attribute.func_name,

1212

attribute.func_defaults,

1213

attribute.func_closure)))

1214

if deprecate:

1215

# Deprecate all alternate interfaces

1216

iname="_AlternateDBusNames_interface_annotation{}"

1217

for interface_name in interface_names:

1218

1219

@dbus_interface_annotations(interface_name)

1220

def func(self):

1221

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

1222

"true" }

1223

# Find an unused name

1224

for aname in (iname.format(i)

1225

for i in itertools.count()):

1226

if aname not in attr:

1227

attr[aname] = func

1228

break

1229

if interface_names:

1230

# Replace the class with a new subclass of it with

1231

# methods, signals, etc. as created above.

1232

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

1233

(cls, ), attr)

1234

return cls

1235

1236

return wrapper

1237

1238

1239

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

1240

"se.bsnet.fukt.Mandos"})

1241

740

class ClientDBus(Client, DBusObjectWithProperties):

1242

741

"""A Client class using D-Bus

1243

742

1247

746

"""

1248

747

1249

748

runtime_expansions = (Client.runtime_expansions

1250

+ ("dbus_object_path", ))

1251

1252

_interface = "se.recompile.Mandos.Client"

749

+ ("dbus_object_path",))

1253

750

1254

751

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

1255

752

1256

753

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

754

self._approvals_pending = 0

1257

755

self.bus = bus

1258

756

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

1259

757

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

1260

758

# the D-Bus

1261

client_object_name = str(self.name).translate(

759

client_object_name = unicode(self.name).translate(

1262

760

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

1263

761

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

1264

self.dbus_object_path = dbus.ObjectPath(

1265

"/clients/" + client_object_name)

762

self.dbus_object_path = (dbus.ObjectPath

763

("/clients/" + client_object_name))

1266

764

DBusObjectWithProperties.__init__(self, self.bus,

1267

765

self.dbus_object_path)

1268

1269

def notifychangeproperty(transform_func, dbus_name,

1270

type_func=lambda x: x,

1271

variant_level=1,

1272

invalidate_only=False,

1273

_interface=_interface):

1274

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

1275

its changes to DBus.

1276

1277

transform_fun: Function that takes a value and a variant_level

1278

and transforms it to a D-Bus type.

1279

dbus_name: D-Bus name of the variable

1280

type_func: Function that transform the value before sending it

1281

to the D-Bus. Default: no transform

1282

variant_level: D-Bus variant level. Default: 1

1283

"""

1284

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

1285

1286

def setter(self, value):

1287

if hasattr(self, "dbus_object_path"):

1288

if (not hasattr(self, attrname) or

1289

type_func(getattr(self, attrname, None))

1290

!= type_func(value)):

1291

if invalidate_only:

1292

self.PropertiesChanged(

1293

_interface, dbus.Dictionary(),

1294

dbus.Array((dbus_name, )))

1295

else:

1296

dbus_value = transform_func(

1297

type_func(value),

1298

variant_level = variant_level)

1299

self.PropertyChanged(dbus.String(dbus_name),

1300

dbus_value)

1301

self.PropertiesChanged(

1302

_interface,

1303

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

1304

dbus_value }),

1305

dbus.Array())

1306

setattr(self, attrname, value)

1307

1308

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

1309

1310

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1311

approvals_pending = notifychangeproperty(dbus.Boolean,

1312

"ApprovalPending",

1313

type_func = bool)

1314

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

1315

last_enabled = notifychangeproperty(datetime_to_dbus,

1316

"LastEnabled")

1317

checker = notifychangeproperty(

1318

dbus.Boolean, "CheckerRunning",

1319

type_func = lambda checker: checker is not None)

1320

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1321

"LastCheckedOK")

1322

last_checker_status = notifychangeproperty(dbus.Int16,

1323

"LastCheckerStatus")

1324

last_approval_request = notifychangeproperty(

1325

datetime_to_dbus, "LastApprovalRequest")

1326

approved_by_default = notifychangeproperty(dbus.Boolean,

1327

"ApprovedByDefault")

1328

approval_delay = notifychangeproperty(

1329

dbus.UInt64, "ApprovalDelay",

1330

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

1331

approval_duration = notifychangeproperty(

1332

dbus.UInt64, "ApprovalDuration",

1333

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

1334

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

1335

timeout = notifychangeproperty(

1336

dbus.UInt64, "Timeout",

1337

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

1338

extended_timeout = notifychangeproperty(

1339

dbus.UInt64, "ExtendedTimeout",

1340

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

1341

interval = notifychangeproperty(

1342

dbus.UInt64, "Interval",

1343

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

1344

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

1345

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

1346

invalidate_only=True)

1347

1348

del notifychangeproperty

766

767

def _get_approvals_pending(self):

768

return self._approvals_pending

769

def _set_approvals_pending(self, value):

770

old_value = self._approvals_pending

771

self._approvals_pending = value

772

bval = bool(value)

773

if (hasattr(self, "dbus_object_path")

774

and bval is not bool(old_value)):

775

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

776

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

777

dbus_bool)

778

779

approvals_pending = property(_get_approvals_pending,

780

_set_approvals_pending)

781

del _get_approvals_pending, _set_approvals_pending

782

783

@staticmethod

784

def _datetime_to_dbus(dt, variant_level=0):

785

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

786

return dbus.String(dt.isoformat(),

787

variant_level=variant_level)

788

789

def enable(self):

790

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

791

r = Client.enable(self)

792

if oldstate != self.enabled:

793

# Emit D-Bus signals

794

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

795

dbus.Boolean(True, variant_level=1))

796

self.PropertyChanged(

797

dbus.String("LastEnabled"),

798

self._datetime_to_dbus(self.last_enabled,

799

variant_level=1))

800

return r

801

802

def disable(self, quiet = False):

803

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

804

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

805

if not quiet and oldstate != self.enabled:

806

# Emit D-Bus signal

807

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

808

dbus.Boolean(False, variant_level=1))

809

return r

1349

810

1350

811

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

1351

812

try:

1360

821

*args, **kwargs):

1361

822

self.checker_callback_tag = None

1362

823

self.checker = None

824

# Emit D-Bus signal

825

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

826

dbus.Boolean(False, variant_level=1))

1363

827

if os.WIFEXITED(condition):

1364

828

exitstatus = os.WEXITSTATUS(condition)

1365

829

# Emit D-Bus signal

1375

839

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

1376

840

*args, **kwargs)

1377

841

842

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

843

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

844

# Emit D-Bus signal

845

self.PropertyChanged(

846

dbus.String("LastCheckedOK"),

847

(self._datetime_to_dbus(self.last_checked_ok,

848

variant_level=1)))

849

850

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

851

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

852

# Emit D-Bus signal

853

self.PropertyChanged(

854

dbus.String("LastApprovalRequest"),

855

(self._datetime_to_dbus(self.last_approval_request,

856

variant_level=1)))

857

return r

858

1378

859

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

1379

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

860

old_checker = self.checker

861

if self.checker is not None:

862

old_checker_pid = self.checker.pid

863

else:

864

old_checker_pid = None

1380

865

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

1381

866

# Only if new checker process was started

1382

867

if (self.checker is not None

1383

868

and old_checker_pid != self.checker.pid):

1384

869

# Emit D-Bus signal

1385

870

self.CheckerStarted(self.current_checker_command)

871

self.PropertyChanged(

872

dbus.String("CheckerRunning"),

873

dbus.Boolean(True, variant_level=1))

1386

874

return r

1387

875

876

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

877

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

878

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

879

if (old_checker is not None

880

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

881

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

882

dbus.Boolean(False, variant_level=1))

883

return r

884

1388

885

def _reset_approved(self):

1389

self.approved = None

886

self._approved = None

1390

887

return False

1391

888

1392

889

def approve(self, value=True):

1393

self.approved = value

1394

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

1395

* 1000), self._reset_approved)

1396

890

self.send_changedstate()

891

self._approved = value

892

gobject.timeout_add(self._timedelta_to_milliseconds

893

(self.approval_duration),

894

self._reset_approved)

895

1397

896

1398

897

## D-Bus methods, signals & properties

1399

1400

## Interfaces

898

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

1401

899

1402

900

## Signals

1403

901

1414

912

pass

1415

913

1416

914

# PropertyChanged - signal

1417

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

1418

915

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

1419

916

def PropertyChanged(self, property, value):

1420

917

"D-Bus signal"

1484

981

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

1485

982

1486

983

# ApprovedByDefault - property

1487

@dbus_service_property(_interface,

1488

signature="b",

984

@dbus_service_property(_interface, signature="b",

1489

985

access="readwrite")

1490

986

def ApprovedByDefault_dbus_property(self, value=None):

1491

987

if value is None: # get

1492

988

return dbus.Boolean(self.approved_by_default)

1493

989

self.approved_by_default = bool(value)

990

# Emit D-Bus signal

991

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

992

dbus.Boolean(value, variant_level=1))

1494

993

1495

994

# ApprovalDelay - property

1496

@dbus_service_property(_interface,

1497

signature="t",

995

@dbus_service_property(_interface, signature="t",

1498

996

access="readwrite")

1499

997

def ApprovalDelay_dbus_property(self, value=None):

1500

998

if value is None: # get

1501

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

1502

* 1000)

999

return dbus.UInt64(self.approval_delay_milliseconds())

1503

1000

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

1001

# Emit D-Bus signal

1002

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

1003

dbus.UInt64(value, variant_level=1))

1504

1004

1505

1005

# ApprovalDuration - property

1506

@dbus_service_property(_interface,

1507

signature="t",

1006

@dbus_service_property(_interface, signature="t",

1508

1007

access="readwrite")

1509

1008

def ApprovalDuration_dbus_property(self, value=None):

1510

1009

if value is None: # get

1511

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

1512

* 1000)

1010

return dbus.UInt64(self._timedelta_to_milliseconds(

1011

self.approval_duration))

1513

1012

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

1013

# Emit D-Bus signal

1014

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

1015

dbus.UInt64(value, variant_level=1))

1514

1016

1515

1017

# Name - property

1516

1018

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

1523

1025

return dbus.String(self.fingerprint)

1524

1026

1525

1027

# Host - property

1526

@dbus_service_property(_interface,

1527

signature="s",

1028

@dbus_service_property(_interface, signature="s",

1528

1029

access="readwrite")

1529

1030

def Host_dbus_property(self, value=None):

1530

1031

if value is None: # get

1531

1032

return dbus.String(self.host)

1532

self.host = str(value)

1033

self.host = value

1034

# Emit D-Bus signal

1035

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

1036

dbus.String(value, variant_level=1))

1533

1037

1534

1038

# Created - property

1535

1039

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

1536

1040

def Created_dbus_property(self):

1537

return datetime_to_dbus(self.created)

1041

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

1538

1042

1539

1043

# LastEnabled - property

1540

1044

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

1541

1045

def LastEnabled_dbus_property(self):

1542

return datetime_to_dbus(self.last_enabled)

1046

if self.last_enabled is None:

1047

return dbus.String("")

1048

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

1543

1049

1544

1050

# Enabled - property

1545

@dbus_service_property(_interface,

1546

signature="b",

1051

@dbus_service_property(_interface, signature="b",

1547

1052

access="readwrite")

1548

1053

def Enabled_dbus_property(self, value=None):

1549

1054

if value is None: # get

1554

1059

self.disable()

1555

1060

1556

1061

# LastCheckedOK - property

1557

@dbus_service_property(_interface,

1558

signature="s",

1062

@dbus_service_property(_interface, signature="s",

1559

1063

access="readwrite")

1560

1064

def LastCheckedOK_dbus_property(self, value=None):

1561

1065

if value is not None:

1562

1066

self.checked_ok()

1563

1067

return

1564

return datetime_to_dbus(self.last_checked_ok)

1565

1566

# LastCheckerStatus - property

1567

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

1568

def LastCheckerStatus_dbus_property(self):

1569

return dbus.Int16(self.last_checker_status)

1570

1571

# Expires - property

1572

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

1573

def Expires_dbus_property(self):

1574

return datetime_to_dbus(self.expires)

1068

if self.last_checked_ok is None:

1069

return dbus.String("")

1070

return dbus.String(self._datetime_to_dbus(self

1071

.last_checked_ok))

1575

1072

1576

1073

# LastApprovalRequest - property

1577

1074

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

1578

1075

def LastApprovalRequest_dbus_property(self):

1579

return datetime_to_dbus(self.last_approval_request)

1076

if self.last_approval_request is None:

1077

return dbus.String("")

1078

return dbus.String(self.

1079

_datetime_to_dbus(self

1080

.last_approval_request))

1580

1081

1581

1082

# Timeout - property

1582

@dbus_service_property(_interface,

1583

signature="t",

1083

@dbus_service_property(_interface, signature="t",

1584

1084

access="readwrite")

1585

1085

def Timeout_dbus_property(self, value=None):

1586

1086

if value is None: # get

1587

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

1588

old_timeout = self.timeout

1087

return dbus.UInt64(self.timeout_milliseconds())

1589

1088

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

1590

# Reschedule disabling

1591

if self.enabled:

1592

now = datetime.datetime.utcnow()

1593

self.expires += self.timeout - old_timeout

1594

if self.expires <= now:

1595

# The timeout has passed

1596

self.disable()

1597

else:

1598

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

1599

is None):

1600

return

1601

gobject.source_remove(self.disable_initiator_tag)

1602

self.disable_initiator_tag = gobject.timeout_add(

1603

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

1604

self.disable)

1605

1606

# ExtendedTimeout - property

1607

@dbus_service_property(_interface,

1608

signature="t",

1609

access="readwrite")

1610

def ExtendedTimeout_dbus_property(self, value=None):

1611

if value is None: # get

1612

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

1613

* 1000)

1614

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

1089

# Emit D-Bus signal

1090

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

1091

dbus.UInt64(value, variant_level=1))

1092

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

1093

return

1094

# Reschedule timeout

1095

gobject.source_remove(self.disable_initiator_tag)

1096

self.disable_initiator_tag = None

1097

time_to_die = (self.

1098

_timedelta_to_milliseconds((self

1099

.last_checked_ok

1100

+ self.timeout)

1101

- datetime.datetime

1102

.utcnow()))

1103

if time_to_die <= 0:

1104

# The timeout has passed

1105

self.disable()

1106

else:

1107

self.disable_initiator_tag = (gobject.timeout_add

1108

(time_to_die, self.disable))

1615

1109

1616

1110

# Interval - property

1617

@dbus_service_property(_interface,

1618

signature="t",

1111

@dbus_service_property(_interface, signature="t",

1619

1112

access="readwrite")

1620

1113

def Interval_dbus_property(self, value=None):

1621

1114

if value is None: # get

1622

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

1115

return dbus.UInt64(self.interval_milliseconds())

1623

1116

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

1117

# Emit D-Bus signal

1118

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

1119

dbus.UInt64(value, variant_level=1))

1624

1120

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

1625

1121

return

1626

if self.enabled:

1627

# Reschedule checker run

1628

gobject.source_remove(self.checker_initiator_tag)

1629

self.checker_initiator_tag = gobject.timeout_add(

1630

value, self.start_checker)

1631

self.start_checker() # Start one now, too

1632

1122

# Reschedule checker run

1123

gobject.source_remove(self.checker_initiator_tag)

1124

self.checker_initiator_tag = (gobject.timeout_add

1125

(value, self.start_checker))

1126

self.start_checker() # Start one now, too

1127

1633

1128

# Checker - property

1634

@dbus_service_property(_interface,

1635

signature="s",

1129

@dbus_service_property(_interface, signature="s",

1636

1130

access="readwrite")

1637

1131

def Checker_dbus_property(self, value=None):

1638

1132

if value is None: # get

1639

1133

return dbus.String(self.checker_command)

1640

self.checker_command = str(value)

1134

self.checker_command = value

1135

# Emit D-Bus signal

1136

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

1137

dbus.String(self.checker_command,

1138

variant_level=1))

1641

1139

1642

1140

# CheckerRunning - property

1643

@dbus_service_property(_interface,

1644

signature="b",

1141

@dbus_service_property(_interface, signature="b",

1645

1142

access="readwrite")

1646

1143

def CheckerRunning_dbus_property(self, value=None):

1647

1144

if value is None: # get

1657

1154

return self.dbus_object_path # is already a dbus.ObjectPath

1658

1155

1659

1156

# Secret = property

1660

@dbus_service_property(_interface,

1661

signature="ay",

1662

access="write",

1663

byte_arrays=True)

1157

@dbus_service_property(_interface, signature="ay",

1158

access="write", byte_arrays=True)

1664

1159

def Secret_dbus_property(self, value):

1665

self.secret = bytes(value)

1160

self.secret = str(value)

1666

1161

1667

1162

del _interface

1668

1163

1672

1167

self._pipe = child_pipe

1673

1168

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

1674

1169

if not self._pipe.recv():

1675

raise KeyError(fpr)

1676

1170

raise KeyError()

1171

1677

1172

def __getattribute__(self, name):

1678

if name == '_pipe':

1173

if(name == '_pipe'):

1679

1174

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

1680

1175

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

1681

1176

data = self._pipe.recv()

1682

1177

if data[0] == 'data':

1683

1178

return data[1]

1684

1179

if data[0] == 'function':

1685

1686

1180

def func(*args, **kwargs):

1687

1181

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

1688

1182

return self._pipe.recv()[1]

1689

1690

1183

return func

1691

1184

1692

1185

def __setattr__(self, name, value):

1693

if name == '_pipe':

1186

if(name == '_pipe'):

1694

1187

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

1695

1188

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

1696

1189

1704

1197

def handle(self):

1705

1198

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

1706

1199

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

1707

str(self.client_address))

1200

unicode(self.client_address))

1708

1201

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

1709

1202

self.server.child_pipe.fileno())

1710

1711

session = gnutls.connection.ClientSession(

1712

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

1713

1203

1204

session = (gnutls.connection

1205

.ClientSession(self.request,

1206

gnutls.connection

1207

.X509Credentials()))

1208

1714

1209

# Note: gnutls.connection.X509Credentials is really a

1715

1210

# generic GnuTLS certificate credentials object so long as

1716

1211

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

1717

1212

# here despite using OpenPGP certificates.

1718

1213

1719

1214

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

1720

1215

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

1721

1216

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

1724

1219

priority = self.server.gnutls_priority

1725

1220

if priority is None:

1726

1221

priority = "NORMAL"

1727

gnutls.library.functions.gnutls_priority_set_direct(

1728

session._c_object, priority, None)

1729

1222

(gnutls.library.functions

1223

.gnutls_priority_set_direct(session._c_object,

1224

priority, None))

1225

1730

1226

# Start communication using the Mandos protocol

1731

1227

# Get protocol number

1732

1228

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

1733

1229

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

1734

1230

try:

1735

1231

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

1736

raise RuntimeError(line)

1232

raise RuntimeError

1737

1233

except (ValueError, IndexError, RuntimeError) as error:

1738

1234

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

1739

1235

return

1740

1236

1741

1237

# Start GnuTLS connection

1742

1238

try:

1743

1239

session.handshake()

1747

1243

# established. Just abandon the request.

1748

1244

return

1749

1245

logger.debug("Handshake succeeded")

1750

1246

1751

1247

approval_required = False

1752

1248

try:

1753

1249

try:

1754

fpr = self.fingerprint(

1755

self.peer_certificate(session))

1250

fpr = self.fingerprint(self.peer_certificate

1251

(session))

1756

1252

except (TypeError,

1757

1253

gnutls.errors.GNUTLSError) as error:

1758

1254

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

1759

1255

return

1760

1256

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

1761

1257

1762

1258

try:

1763

1259

client = ProxyClient(child_pipe, fpr,

1764

1260

self.client_address)

1773

1269

while True:

1774

1270

if not client.enabled:

1775

1271

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

1776

client.name)

1272

client.name)

1777

1273

if self.server.use_dbus:

1778

1274

# Emit D-Bus signal

1779

client.Rejected("Disabled")

1275

client.Rejected("Disabled")

1780

1276

return

1781

1277

1782

if client.approved or not client.approval_delay:

1278

if client._approved or not client.approval_delay:

1783

1279

#We are approved or approval is disabled

1784

1280

break

1785

elif client.approved is None:

1281

elif client._approved is None:

1786

1282

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

1787

1283

client.name)

1788

1284

if self.server.use_dbus:

1789

1285

# Emit D-Bus signal

1790

1286

client.NeedApproval(

1791

client.approval_delay.total_seconds()

1792

* 1000, client.approved_by_default)

1287

client.approval_delay_milliseconds(),

1288

client.approved_by_default)

1793

1289

else:

1794

1290

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

1795

1291

client.name)

1799

1295

return

1800

1296

1801

1297

#wait until timeout or approved

1298

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

1802

1299

time = datetime.datetime.now()

1803

1300

client.changedstate.acquire()

1804

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

1301

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

1805

1302

client.changedstate.release()

1806

1303

time2 = datetime.datetime.now()

1807

1304

if (time2 - time) >= delay:

1823

1320

try:

1824

1321

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

1825

1322

except gnutls.errors.GNUTLSError as error:

1826

logger.warning("gnutls send failed",

1827

exc_info=error)

1323

logger.warning("gnutls send failed")

1828

1324

return

1829

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

1830

len(client.secret) - (sent_size

1831

+ sent))

1325

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

1326

sent, len(client.secret)

1327

- (sent_size + sent))

1832

1328

sent_size += sent

1833

1329

1834

1330

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

1835

# bump the timeout using extended_timeout

1836

client.bump_timeout(client.extended_timeout)

1331

# bump the timeout as if seen

1332

client.checked_ok()

1837

1333

if self.server.use_dbus:

1838

1334

# Emit D-Bus signal

1839

1335

client.GotSecret()

1844

1340

try:

1845

1341

session.bye()

1846

1342

except gnutls.errors.GNUTLSError as error:

1847

logger.warning("GnuTLS bye failed",

1848

exc_info=error)

1343

logger.warning("GnuTLS bye failed")

1849

1344

1850

1345

@staticmethod

1851

1346

def peer_certificate(session):

1852

1347

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

1853

1348

# If not an OpenPGP certificate...

1854

if (gnutls.library.functions.gnutls_certificate_type_get(

1855

session._c_object)

1349

if (gnutls.library.functions

1350

.gnutls_certificate_type_get(session._c_object)

1856

1351

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

1857

1352

# ...do the normal thing

1858

1353

return session.peer_certificate

1872

1367

def fingerprint(openpgp):

1873

1368

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

1874

1369

# New GnuTLS "datum" with the OpenPGP public key

1875

datum = gnutls.library.types.gnutls_datum_t(

1876

ctypes.cast(ctypes.c_char_p(openpgp),

1877

ctypes.POINTER(ctypes.c_ubyte)),

1878

ctypes.c_uint(len(openpgp)))

1370

datum = (gnutls.library.types

1371

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

1372

ctypes.POINTER

1373

(ctypes.c_ubyte)),

1374

ctypes.c_uint(len(openpgp))))

1879

1375

# New empty GnuTLS certificate

1880

1376

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1881

gnutls.library.functions.gnutls_openpgp_crt_init(

1882

ctypes.byref(crt))

1377

(gnutls.library.functions

1378

.gnutls_openpgp_crt_init(ctypes.byref(crt)))

1883

1379

# Import the OpenPGP public key into the certificate

1884

gnutls.library.functions.gnutls_openpgp_crt_import(

1885

crt, ctypes.byref(datum),

1886

gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)

1380

(gnutls.library.functions

1381

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

1382

gnutls.library.constants

1383

.GNUTLS_OPENPGP_FMT_RAW))

1887

1384

# Verify the self signature in the key

1888

1385

crtverify = ctypes.c_uint()

1889

gnutls.library.functions.gnutls_openpgp_crt_verify_self(

1890

crt, 0, ctypes.byref(crtverify))

1386

(gnutls.library.functions

1387

.gnutls_openpgp_crt_verify_self(crt, 0,

1388

ctypes.byref(crtverify)))

1891

1389

if crtverify.value != 0:

1892

1390

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1893

raise gnutls.errors.CertificateSecurityError(

1894

"Verify failed")

1391

raise (gnutls.errors.CertificateSecurityError

1392

("Verify failed"))

1895

1393

# New buffer for the fingerprint

1896

1394

buf = ctypes.create_string_buffer(20)

1897

1395

buf_len = ctypes.c_size_t()

1898

1396

# Get the fingerprint from the certificate into the buffer

1899

gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint(

1900

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

1397

(gnutls.library.functions

1398

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

1399

ctypes.byref(buf_len)))

1901

1400

# Deinit the certificate

1902

1401

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1903

1402

# Convert the buffer to a Python bytestring

1904

1403

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

1905

1404

# Convert the bytestring to hexadecimal notation

1906

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

1405

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

1907

1406

return hex_fpr

1908

1407

1909

1408

1910

1409

class MultiprocessingMixIn(object):

1911

1410

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

1912

1913

1411

def sub_process_main(self, request, address):

1914

1412

try:

1915

1413

self.finish_request(request, address)

1916

except Exception:

1414

except:

1917

1415

self.handle_error(request, address)

1918

1416

self.close_request(request)

1919

1417

1920

1418

def process_request(self, request, address):

1921

1419

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

1922

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

1923

args = (request, address))

1924

proc.start()

1925

return proc

1926

1420

multiprocessing.Process(target = self.sub_process_main,

1421

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

1927

1422

1928

1423

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1929

1424

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

1930

1931

1425

def process_request(self, request, client_address):

1932

1426

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

1933

1427

1934

1428

This function creates a new pipe in self.pipe

1935

1429

"""

1936

1430

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1937

1938

proc = MultiprocessingMixIn.process_request(self, request,

1939

client_address)

1431

1432

super(MultiprocessingMixInWithPipe,

1433

self).process_request(request, client_address)

1940

1434

self.child_pipe.close()

1941

self.add_pipe(parent_pipe, proc)

1942

1943

def add_pipe(self, parent_pipe, proc):

1435

self.add_pipe(parent_pipe)

1436

1437

def add_pipe(self, parent_pipe):

1944

1438

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

1945

raise NotImplementedError()

1946

1439

raise NotImplementedError

1947

1440

1948

1441

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1949

1442

socketserver.TCPServer, object):

1954

1447

interface: None or a network interface name (string)

1955

1448

use_ipv6: Boolean; to use IPv6 or not

1956

1449

"""

1957

1958

1450

def __init__(self, server_address, RequestHandlerClass,

1959

interface=None,

1960

use_ipv6=True,

1961

socketfd=None):

1962

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

1963

creating a new one with socket.socket().

1964

"""

1451

interface=None, use_ipv6=True):

1965

1452

self.interface = interface

1966

1453

if use_ipv6:

1967

1454

self.address_family = socket.AF_INET6

1968

if socketfd is not None:

1969

# Save the file descriptor

1970

self.socketfd = socketfd

1971

# Save the original socket.socket() function

1972

self.socket_socket = socket.socket

1973

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

1974

#

1975

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

1976

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

1977

# patching socket.socket.)

1978

#

1979

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

1980

@functools.wraps(socket.socket)

1981

def socket_wrapper(*args, **kwargs):

1982

# Restore original function so subsequent calls are

1983

# not affected.

1984

socket.socket = self.socket_socket

1985

del self.socket_socket

1986

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

1987

# saved file descriptor.

1988

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

1989

# Replace socket.socket() function with wrapper

1990

socket.socket = socket_wrapper

1991

# The socketserver.TCPServer.__init__ will call

1992

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

1993

# socket_wrapper(), if socketfd was set.

1994

1455

socketserver.TCPServer.__init__(self, server_address,

1995

1456

RequestHandlerClass)

1996

1997

1457

def server_bind(self):

1998

1458

"""This overrides the normal server_bind() function

1999

1459

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

2005

1465

self.interface)

2006

1466

else:

2007

1467

try:

2008

self.socket.setsockopt(

2009

socket.SOL_SOCKET, SO_BINDTODEVICE,

2010

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

1468

self.socket.setsockopt(socket.SOL_SOCKET,

1469

SO_BINDTODEVICE,

1470

str(self.interface

1471

+ '\0'))

2011

1472

except socket.error as error:

2012

if error.errno == errno.EPERM:

2013

logger.error("No permission to bind to"

2014

" interface %s", self.interface)

2015

elif error.errno == errno.ENOPROTOOPT:

1473

if error[0] == errno.EPERM:

1474

logger.error("No permission to"

1475

" bind to interface %s",

1476

self.interface)

1477

elif error[0] == errno.ENOPROTOOPT:

2016

1478

logger.error("SO_BINDTODEVICE not available;"

2017

1479

" cannot bind to interface %s",

2018

1480

self.interface)

2019

elif error.errno == errno.ENODEV:

2020

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

2021

" cannot bind", self.interface)

2022

1481

else:

2023

1482

raise

2024

1483

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

2027

1486

if self.address_family == socket.AF_INET6:

2028

1487

any_address = "::" # in6addr_any

2029

1488

else:

2030

any_address = "0.0.0.0" # INADDR_ANY

1489

any_address = socket.INADDR_ANY

2031

1490

self.server_address = (any_address,

2032

1491

self.server_address[1])

2033

1492

elif not self.server_address[1]:

2034

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

1493

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

1494

0)

2035

1495

# if self.interface:

2036

1496

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

2037

1497

# 0, # port

2051

1511

2052

1512

Assumes a gobject.MainLoop event loop.

2053

1513

"""

2054

2055

1514

def __init__(self, server_address, RequestHandlerClass,

2056

interface=None,

2057

use_ipv6=True,

2058

clients=None,

2059

gnutls_priority=None,

2060

use_dbus=True,

2061

socketfd=None):

1515

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

1516

gnutls_priority=None, use_dbus=True):

2062

1517

self.enabled = False

2063

1518

self.clients = clients

2064

1519

if self.clients is None:

2065

self.clients = {}

1520

self.clients = set()

2066

1521

self.use_dbus = use_dbus

2067

1522

self.gnutls_priority = gnutls_priority

2068

1523

IPv6_TCPServer.__init__(self, server_address,

2069

1524

RequestHandlerClass,

2070

1525

interface = interface,

2071

use_ipv6 = use_ipv6,

2072

socketfd = socketfd)

2073

1526

use_ipv6 = use_ipv6)

2074

1527

def server_activate(self):

2075

1528

if self.enabled:

2076

1529

return socketserver.TCPServer.server_activate(self)

2077

2078

1530

def enable(self):

2079

1531

self.enabled = True

2080

2081

def add_pipe(self, parent_pipe, proc):

1532

def add_pipe(self, parent_pipe):

2082

1533

# Call "handle_ipc" for both data and EOF events

2083

gobject.io_add_watch(

2084

parent_pipe.fileno(),

2085

gobject.IO_IN | gobject.IO_HUP,

2086

functools.partial(self.handle_ipc,

2087

parent_pipe = parent_pipe,

2088

proc = proc))

2089

2090

def handle_ipc(self, source, condition,

2091

parent_pipe=None,

2092

proc = None,

1534

gobject.io_add_watch(parent_pipe.fileno(),

1535

gobject.IO_IN | gobject.IO_HUP,

1536

functools.partial(self.handle_ipc,

1537

parent_pipe = parent_pipe))

1538

1539

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

2093

1540

client_object=None):

2094

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

2095

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

2096

# Wait for other process to exit

2097

proc.join()

1541

condition_names = {

1542

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

1543

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

1544

# blocking).

1545

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

1546

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

1547

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

1548

# broken, usually for pipes and

1549

# sockets).

1550

}

1551

conditions_string = ' | '.join(name

1552

for cond, name in

1553

condition_names.iteritems()

1554

if cond & condition)

1555

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

1556

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

2098

1557

return False

2099

1558

2100

1559

# Read a request from the child

2105

1564

fpr = request[1]

2106

1565

address = request[2]

2107

1566

2108

for c in self.clients.itervalues():

1567

for c in self.clients:

2109

1568

if c.fingerprint == fpr:

2110

1569

client = c

2111

1570

break

2114

1573

"dress: %s", fpr, address)

2115

1574

if self.use_dbus:

2116

1575

# Emit D-Bus signal

2117

mandos_dbus_service.ClientNotFound(fpr,

2118

address[0])

1576

mandos_dbus_service.ClientNotFound(fpr, address[0])

2119

1577

parent_pipe.send(False)

2120

1578

return False

2121

1579

2122

gobject.io_add_watch(

2123

parent_pipe.fileno(),

2124

gobject.IO_IN | gobject.IO_HUP,

2125

functools.partial(self.handle_ipc,

2126

parent_pipe = parent_pipe,

2127

proc = proc,

2128

client_object = client))

1580

gobject.io_add_watch(parent_pipe.fileno(),

1581

gobject.IO_IN | gobject.IO_HUP,

1582

functools.partial(self.handle_ipc,

1583

parent_pipe = parent_pipe,

1584

client_object = client))

2129

1585

parent_pipe.send(True)

2130

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

2131

# same fileno

1586

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

2132

1587

return False

2133

1588

if command == 'funcall':

2134

1589

funcname = request[1]

2135

1590

args = request[2]

2136

1591

kwargs = request[3]

2137

1592

2138

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

2139

funcname)(*args,

2140

**kwargs)))

2141

1593

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

1594

2142

1595

if command == 'getattr':

2143

1596

attrname = request[1]

2144

1597

if callable(client_object.__getattribute__(attrname)):

2145

parent_pipe.send(('function', ))

1598

parent_pipe.send(('function',))

2146

1599

else:

2147

parent_pipe.send((

2148

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

1600

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

2149

1601

2150

1602

if command == 'setattr':

2151

1603

attrname = request[1]

2152

1604

value = request[2]

2153

1605

setattr(client_object, attrname, value)

2154

1606

2155

1607

return True

2156

1608

2157

1609

2158

def rfc3339_duration_to_delta(duration):

2159

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

2160

2161

>>> rfc3339_duration_to_delta("P7D")

2162

datetime.timedelta(7)

2163

>>> rfc3339_duration_to_delta("PT60S")

2164

datetime.timedelta(0, 60)

2165

>>> rfc3339_duration_to_delta("PT60M")

2166

datetime.timedelta(0, 3600)

2167

>>> rfc3339_duration_to_delta("PT24H")

2168

datetime.timedelta(1)

2169

>>> rfc3339_duration_to_delta("P1W")

2170

datetime.timedelta(7)

2171

>>> rfc3339_duration_to_delta("PT5M30S")

2172

datetime.timedelta(0, 330)

2173

>>> rfc3339_duration_to_delta("P1DT3M20S")

2174

datetime.timedelta(1, 200)

2175

"""

2176

2177

# Parsing an RFC 3339 duration with regular expressions is not

2178

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

2179

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

2180

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

2181

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

2182

# avoid excessive use of external libraries.

2183

2184

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

2185

Token = collections.namedtuple("Token", (

2186

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

2187

# a "group" containing digits

2188

"value", # datetime.timedelta or None

2189

"followers")) # Tokens valid after this token

2190

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

2191

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

2192

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

2193

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

2194

datetime.timedelta(seconds=1),

2195

frozenset((token_end, )))

2196

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

2197

datetime.timedelta(minutes=1),

2198

frozenset((token_second, token_end)))

2199

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

2200

datetime.timedelta(hours=1),

2201

frozenset((token_minute, token_end)))

2202

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

2203

None,

2204

frozenset((token_hour, token_minute,

2205

token_second)))

2206

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

2207

datetime.timedelta(days=1),

2208

frozenset((token_time, token_end)))

2209

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

2210

datetime.timedelta(weeks=4),

2211

frozenset((token_day, token_end)))

2212

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

2213

datetime.timedelta(weeks=52),

2214

frozenset((token_month, token_end)))

2215

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

2216

datetime.timedelta(weeks=1),

2217

frozenset((token_end, )))

2218

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

2219

frozenset((token_year, token_month,

2220

token_day, token_time,

2221

token_week)))

2222

# Define starting values

2223

value = datetime.timedelta() # Value so far

2224

found_token = None

2225

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

2226

s = duration # String left to parse

2227

# Loop until end token is found

2228

while found_token is not token_end:

2229

# Search for any currently valid tokens

2230

for token in followers:

2231

match = token.regexp.match(s)

2232

if match is not None:

2233

# Token found

2234

if token.value is not None:

2235

# Value found, parse digits

2236

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

2237

# Add to value so far

2238

value += factor * token.value

2239

# Strip token from string

2240

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

2241

# Go to found token

2242

found_token = token

2243

# Set valid next tokens

2244

followers = found_token.followers

2245

break

2246

else:

2247

# No currently valid tokens were found

2248

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

2249

.format(duration))

2250

# End token found

2251

return value

2252

2253

2254

1610

def string_to_delta(interval):

2255

1611

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

2256

1612

2267

1623

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

2268

1624

datetime.timedelta(0, 330)

2269

1625

"""

2270

2271

try:

2272

return rfc3339_duration_to_delta(interval)

2273

except ValueError:

2274

pass

2275

2276

1626

timevalue = datetime.timedelta(0)

2277

1627

for s in interval.split():

2278

1628

try:

2279

suffix = s[-1]

1629

suffix = unicode(s[-1])

2280

1630

value = int(s[:-1])

2281

1631

if suffix == "d":

2282

1632

delta = datetime.timedelta(value)

2289

1639

elif suffix == "w":

2290

1640

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

2291

1641

else:

2292

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

2293

except IndexError as e:

1642

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

1643

except (ValueError, IndexError) as e:

2294

1644

raise ValueError(*(e.args))

2295

1645

timevalue += delta

2296

1646

return timevalue

2297

1647

2298

1648

1649

def if_nametoindex(interface):

1650

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

1651

1652

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

1653

global if_nametoindex

1654

try:

1655

if_nametoindex = (ctypes.cdll.LoadLibrary

1656

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

1657

.if_nametoindex)

1658

except (OSError, AttributeError):

1659

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

1660

def if_nametoindex(interface):

1661

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

1662

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

1663

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

1664

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1665

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

1666

interface))

1667

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

1668

ifreq[16:20])[0]

1669

return interface_index

1670

return if_nametoindex(interface)

1671

1672

2299

1673

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

2300

1674

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

2301

1675

2309

1683

sys.exit()

2310

1684

if not noclose:

2311

1685

# Close all standard open file descriptors

2312

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

1686

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

2313

1687

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

2314

1688

raise OSError(errno.ENODEV,

2315

"{} not a character device"

2316

.format(os.devnull))

1689

"%s not a character device"

1690

% os.path.devnull)

2317

1691

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

2318

1692

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

2319

1693

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

2328

1702

2329

1703

parser = argparse.ArgumentParser()

2330

1704

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

2331

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

1705

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

2332

1706

help="show version number and exit")

2333

1707

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

2334

1708

help="Bind to interface IF")

2340

1714

help="Run self-test")

2341

1715

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

2342

1716

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

2343

" to terminal", default=None)

1717

" to terminal")

2344

1718

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

2345

1719

help="Debug level for stdout output")

2346

1720

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

2353

1727

" files")

2354

1728

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

2355

1729

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

2356

" system bus interface", default=None)

1730

" system bus interface")

2357

1731

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

2358

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

2359

default=None)

2360

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

2361

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

2362

" state", default=None)

2363

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

2364

help="Specify a file descriptor to a network"

2365

" socket to use instead of creating one")

2366

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

2367

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

2368

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

2369

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

2370

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

2371

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

2372

default=None)

2373

1732

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

2374

1733

options = parser.parse_args()

2375

1734

2376

1735

if options.check:

2377

1736

import doctest

2378

fail_count, test_count = doctest.testmod()

2379

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

1737

doctest.testmod()

1738

sys.exit()

2380

1739

2381

1740

# Default values for config file for server-global settings

2382

1741

server_defaults = { "interface": "",

2384

1743

"port": "",

2385

1744

"debug": "False",

2386

1745

"priority":

2387

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

2388

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

1746

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

2389

1747

"servicename": "Mandos",

2390

1748

"use_dbus": "True",

2391

1749

"use_ipv6": "True",

2392

1750

"debuglevel": "",

2393

"restore": "True",

2394

"socket": "",

2395

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

2396

"foreground": "False",

2397

"zeroconf": "True",

2398

}

1751

}

2399

1752

2400

1753

# Parse config file for server-global settings

2401

1754

server_config = configparser.SafeConfigParser(server_defaults)

2402

1755

del server_defaults

2403

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

1756

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

1757

"mandos.conf"))

2404

1758

# Convert the SafeConfigParser object to a dict

2405

1759

server_settings = server_config.defaults()

2406

1760

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

2407

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

1761

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

2408

1762

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

2409

1763

option)

2410

1764

if server_settings["port"]:

2411

1765

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

2412

1766

"port")

2413

if server_settings["socket"]:

2414

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

2415

"socket")

2416

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

2417

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

2418

# happen with a supplied network socket.

2419

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

2420

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

2421

["socket"])

2422

1767

del server_config

2423

1768

2424

1769

# Override the settings from the config file with command line

2425

1770

# options, if set.

2426

1771

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

2427

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

2428

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

2429

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

1772

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

1773

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

2430

1774

value = getattr(options, option)

2431

1775

if value is not None:

2432

1776

server_settings[option] = value

2433

1777

del options

2434

1778

# Force all strings to be unicode

2435

1779

for option in server_settings.keys():

2436

if isinstance(server_settings[option], bytes):

2437

server_settings[option] = (server_settings[option]

2438

.decode("utf-8"))

2439

# Force all boolean options to be boolean

2440

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

2441

"foreground", "zeroconf"):

2442

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

2443

# Debug implies foreground

2444

if server_settings["debug"]:

2445

server_settings["foreground"] = True

1780

if type(server_settings[option]) is str:

1781

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

2446

1782

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

2447

1783

2448

1784

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

2449

1785

2450

if (not server_settings["zeroconf"]

2451

and not (server_settings["port"]

2452

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

2453

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

2454

2455

1786

# For convenience

2456

1787

debug = server_settings["debug"]

2457

1788

debuglevel = server_settings["debuglevel"]

2458

1789

use_dbus = server_settings["use_dbus"]

2459

1790

use_ipv6 = server_settings["use_ipv6"]

2460

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

2461

stored_state_file)

2462

foreground = server_settings["foreground"]

2463

zeroconf = server_settings["zeroconf"]

2464

2465

if debug:

2466

initlogger(debug, logging.DEBUG)

2467

else:

2468

if not debuglevel:

2469

initlogger(debug)

2470

else:

2471

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

2472

initlogger(debug, level)

2473

1791

2474

1792

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

2475

syslogger.setFormatter(

2476

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

2477

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

2478

server_settings["servicename"])))

1793

syslogger.setFormatter(logging.Formatter

1794

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

1795

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

1796

% server_settings["servicename"]))

2479

1797

2480

1798

# Parse config file with clients

2481

client_config = configparser.SafeConfigParser(Client

2482

.client_defaults)

1799

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

1800

"interval": "5m",

1801

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

1802

"host": "",

1803

"approval_delay": "0s",

1804

"approval_duration": "1s",

1805

}

1806

client_config = configparser.SafeConfigParser(client_defaults)

2483

1807

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

2484

1808

"clients.conf"))

2485

1809

2486

1810

global mandos_dbus_service

2487

1811

mandos_dbus_service = None

2488

1812

2489

socketfd = None

2490

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

2491

socketfd = server_settings["socket"]

2492

tcp_server = MandosServer(

2493

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

2494

ClientHandler,

2495

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

2496

use_ipv6=use_ipv6,

2497

gnutls_priority=server_settings["priority"],

2498

use_dbus=use_dbus,

2499

socketfd=socketfd)

2500

if not foreground:

2501

pidfilename = "/run/mandos.pid"

2502

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

2503

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

2504

pidfile = None

1813

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

1814

server_settings["port"]),

1815

ClientHandler,

1816

interface=(server_settings["interface"]

1817

or None),

1818

use_ipv6=use_ipv6,

1819

gnutls_priority=

1820

server_settings["priority"],

1821

use_dbus=use_dbus)

1822

if not debug:

1823

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

2505

1824

try:

2506

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

2507

except IOError as e:

2508

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

2509

exc_info=e)

1825

pidfile = open(pidfilename, "w")

1826

except IOError:

1827

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

2510

1828

2511

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

1829

try:

1830

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

1831

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

1832

except KeyError:

2512

1833

try:

2513

uid = pwd.getpwnam(name).pw_uid

2514

gid = pwd.getpwnam(name).pw_gid

2515

break

1834

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

1835

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

2516

1836

except KeyError:

2517

continue

2518

else:

2519

uid = 65534

2520

gid = 65534

1837

try:

1838

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

1839

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

1840

except KeyError:

1841

uid = 65534

1842

gid = 65534

2521

1843

try:

2522

1844

os.setgid(gid)

2523

1845

os.setuid(uid)

2524

1846

except OSError as error:

2525

if error.errno != errno.EPERM:

2526

raise

1847

if error[0] != errno.EPERM:

1848

raise error

2527

1849

1850

if not debug and not debuglevel:

1851

syslogger.setLevel(logging.WARNING)

1852

console.setLevel(logging.WARNING)

1853

if debuglevel:

1854

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

1855

syslogger.setLevel(level)

1856

console.setLevel(level)

1857

2528

1858

if debug:

2529

1859

# Enable all possible GnuTLS debugging

2530

1860

2536

1866

def debug_gnutls(level, string):

2537

1867

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

2538

1868

2539

gnutls.library.functions.gnutls_global_set_log_function(

2540

debug_gnutls)

1869

(gnutls.library.functions

1870

.gnutls_global_set_log_function(debug_gnutls))

2541

1871

2542

1872

# Redirect stdin so all checkers get /dev/null

2543

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

1873

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

2544

1874

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

2545

1875

if null > 2:

2546

1876

os.close(null)

1877

else:

1878

# No console logging

1879

logger.removeHandler(console)

2547

1880

2548

1881

# Need to fork before connecting to D-Bus

2549

if not foreground:

1882

if not debug:

2550

1883

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

2551

1884

daemon()

2552

1885

2553

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

2554

# need to inform gobject that threads will be used.

2555

gobject.threads_init()

2556

2557

1886

global main_loop

2558

1887

# From the Avahi example code

2559

DBusGMainLoop(set_as_default=True)

1888

DBusGMainLoop(set_as_default=True )

2560

1889

main_loop = gobject.MainLoop()

2561

1890

bus = dbus.SystemBus()

2562

1891

# End of Avahi example code

2563

1892

if use_dbus:

2564

1893

try:

2565

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

2566

bus,

2567

do_not_queue=True)

2568

old_bus_name = dbus.service.BusName(

2569

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

2570

do_not_queue=True)

2571

except dbus.exceptions.DBusException as e:

2572

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

1894

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

1895

bus, do_not_queue=True)

1896

except dbus.exceptions.NameExistsException as e:

1897

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

2573

1898

use_dbus = False

2574

1899

server_settings["use_dbus"] = False

2575

1900

tcp_server.use_dbus = False

2576

if zeroconf:

2577

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2578

service = AvahiServiceToSyslog(

2579

name = server_settings["servicename"],

2580

servicetype = "_mandos._tcp",

2581

protocol = protocol,

2582

bus = bus)

2583

if server_settings["interface"]:

2584

service.interface = if_nametoindex(

2585

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

1901

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

1902

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

1903

servicetype = "_mandos._tcp",

1904

protocol = protocol, bus = bus)

1905

if server_settings["interface"]:

1906

service.interface = (if_nametoindex

1907

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

2586

1908

2587

1909

global multiprocessing_manager

2588

1910

multiprocessing_manager = multiprocessing.Manager()

2590

1912

client_class = Client

2591

1913

if use_dbus:

2592

1914

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

2593

2594

client_settings = Client.config_parser(client_config)

2595

old_client_settings = {}

2596

clients_data = {}

2597

2598

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

2599

global wnull

2600

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

2601

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

2602

# mode

2603

if debug or not foreground:

2604

wnull.close()

2605

2606

# Get client data and settings from last running state.

2607

if server_settings["restore"]:

2608

try:

2609

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

2610

clients_data, old_client_settings = pickle.load(

2611

stored_state)

2612

os.remove(stored_state_path)

2613

except IOError as e:

2614

if e.errno == errno.ENOENT:

2615

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

2616

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

2617

else:

2618

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

2619

exc_info=e)

2620

raise

2621

except EOFError as e:

2622

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

2623

"EOFError:",

2624

exc_info=e)

2625

2626

with PGPEngine() as pgp:

2627

for client_name, client in clients_data.items():

2628

# Skip removed clients

2629

if client_name not in client_settings:

2630

continue

2631

2632

# Decide which value to use after restoring saved state.

2633

# We have three different values: Old config file,

2634

# new config file, and saved state.

2635

# New config value takes precedence if it differs from old

2636

# config value, otherwise use saved state.

2637

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

2638

try:

2639

# For each value in new config, check if it

2640

# differs from the old config value (Except for

2641

# the "secret" attribute)

2642

if (name != "secret"

2643

and (value !=

2644

old_client_settings[client_name][name])):

2645

client[name] = value

2646

except KeyError:

2647

pass

2648

2649

# Clients who has passed its expire date can still be

2650

# enabled if its last checker was successful. Clients

2651

# whose checker succeeded before we stored its state is

2652

# assumed to have successfully run all checkers during

2653

# downtime.

2654

if client["enabled"]:

2655

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

2656

if not client["last_checked_ok"]:

2657

logger.warning(

2658

"disabling client {} - Client never "

2659

"performed a successful checker".format(

2660

client_name))

2661

client["enabled"] = False

2662

elif client["last_checker_status"] != 0:

2663

logger.warning(

2664

"disabling client {} - Client last"

2665

" checker failed with error code"

2666

" {}".format(

2667

client_name,

2668

client["last_checker_status"]))

2669

client["enabled"] = False

2670

else:

2671

client["expires"] = (

2672

datetime.datetime.utcnow()

2673

+ client["timeout"])

2674

logger.debug("Last checker succeeded,"

2675

" keeping {} enabled".format(

2676

client_name))

1915

def client_config_items(config, section):

1916

special_settings = {

1917

"approved_by_default":

1918

lambda: config.getboolean(section,

1919

"approved_by_default"),

1920

}

1921

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

2677

1922

try:

2678

client["secret"] = pgp.decrypt(

2679

client["encrypted_secret"],

2680

client_settings[client_name]["secret"])

2681

except PGPError:

2682

# If decryption fails, we use secret from new settings

2683

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

2684

client_name))

2685

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

2686

["secret"])

2687

2688

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

2689

for client_name in (set(old_client_settings)

2690

- set(client_settings)):

2691

del clients_data[client_name]

2692

for client_name in (set(client_settings)

2693

- set(old_client_settings)):

2694

clients_data[client_name] = client_settings[client_name]

2695

2696

# Create all client objects

2697

for client_name, client in clients_data.items():

2698

tcp_server.clients[client_name] = client_class(

2699

name = client_name,

2700

settings = client,

2701

server_settings = server_settings)

2702

1923

yield (name, special_settings[name]())

1924

except KeyError:

1925

yield (name, value)

1926

1927

tcp_server.clients.update(set(

1928

client_class(name = section,

1929

config= dict(client_config_items(

1930

client_config, section)))

1931

for section in client_config.sections()))

2703

1932

if not tcp_server.clients:

2704

1933

logger.warning("No clients defined")

2705

2706

if not foreground:

2707

if pidfile is not None:

2708

pid = os.getpid()

2709

try:

2710

with pidfile:

2711

print(pid, file=pidfile)

2712

except IOError:

2713

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

2714

pidfilename, pid)

2715

del pidfile

1934

1935

if not debug:

1936

try:

1937

with pidfile:

1938

pid = os.getpid()

1939

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

1940

del pidfile

1941

except IOError:

1942

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

1943

pidfilename, pid)

1944

except NameError:

1945

# "pidfile" was never created

1946

pass

2716

1947

del pidfilename

2717

1948

1949

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

1950

2718

1951

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

2719

1952

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

2720

1953

2721

1954

if use_dbus:

2722

2723

@alternate_dbus_interfaces(

2724

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

2725

class MandosDBusService(DBusObjectWithProperties):

1955

class MandosDBusService(dbus.service.Object):

2726

1956

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

2727

2728

1957

def __init__(self):

2729

1958

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

2730

2731

_interface = "se.recompile.Mandos"

2732

2733

@dbus_interface_annotations(_interface)

2734

def _foo(self):

2735

return {

2736

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

2737

"false" }

1959

_interface = "se.bsnet.fukt.Mandos"

2738

1960

2739

1961

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

2740

1962

def ClientAdded(self, objpath):

2754

1976

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

2755

1977

def GetAllClients(self):

2756

1978

"D-Bus method"

2757

return dbus.Array(c.dbus_object_path for c in

2758

tcp_server.clients.itervalues())

1979

return dbus.Array(c.dbus_object_path

1980

for c in tcp_server.clients)

2759

1981

2760

1982

@dbus.service.method(_interface,

2761

1983

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

2762

1984

def GetAllClientsWithProperties(self):

2763

1985

"D-Bus method"

2764

1986

return dbus.Dictionary(

2765

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

2766

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

1987

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

1988

for c in tcp_server.clients),

2767

1989

signature="oa{sv}")

2768

1990

2769

1991

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

2770

1992

def RemoveClient(self, object_path):

2771

1993

"D-Bus method"

2772

for c in tcp_server.clients.itervalues():

1994

for c in tcp_server.clients:

2773

1995

if c.dbus_object_path == object_path:

2774

del tcp_server.clients[c.name]

1996

tcp_server.clients.remove(c)

2775

1997

c.remove_from_connection()

2776

1998

# Don't signal anything except ClientRemoved

2777

1999

c.disable(quiet=True)

2786

2008

2787

2009

def cleanup():

2788

2010

"Cleanup function; run on exit"

2789

if zeroconf:

2790

service.cleanup()

2791

2792

multiprocessing.active_children()

2793

wnull.close()

2794

if not (tcp_server.clients or client_settings):

2795

return

2796

2797

# Store client before exiting. Secrets are encrypted with key

2798

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

2799

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

2800

clients = {}

2801

with PGPEngine() as pgp:

2802

for client in tcp_server.clients.itervalues():

2803

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

2804

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

2805

key)

2806

client_dict = {}

2807

2808

# A list of attributes that can not be pickled

2809

# + secret.

2810

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

2811

"checker", "server_settings" }

2812

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

2813

.Object):

2814

exclude.add(name)

2815

2816

client_dict["encrypted_secret"] = (client

2817

.encrypted_secret)

2818

for attr in client.client_structure:

2819

if attr not in exclude:

2820

client_dict[attr] = getattr(client, attr)

2821

2822

clients[client.name] = client_dict

2823

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

2824

2825

try:

2826

with tempfile.NamedTemporaryFile(

2827

mode='wb',

2828

suffix=".pickle",

2829

prefix='clients-',

2830

dir=os.path.dirname(stored_state_path),

2831

delete=False) as stored_state:

2832

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

2833

tempname = stored_state.name

2834

os.rename(tempname, stored_state_path)

2835

except (IOError, OSError) as e:

2836

if not debug:

2837

try:

2838

os.remove(tempname)

2839

except NameError:

2840

pass

2841

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

2842

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

2843

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

2844

else:

2845

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

2846

exc_info=e)

2847

raise

2848

2849

# Delete all clients, and settings from config

2011

service.cleanup()

2012

2850

2013

while tcp_server.clients:

2851

name, client = tcp_server.clients.popitem()

2014

client = tcp_server.clients.pop()

2852

2015

if use_dbus:

2853

2016

client.remove_from_connection()

2017

client.disable_hook = None

2854

2018

# Don't signal anything except ClientRemoved

2855

2019

client.disable(quiet=True)

2856

2020

if use_dbus:

2857

2021

# Emit D-Bus signal

2858

mandos_dbus_service.ClientRemoved(

2859

client.dbus_object_path, client.name)

2860

client_settings.clear()

2022

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2023

client.name)

2861

2024

2862

2025

atexit.register(cleanup)

2863

2026

2864

for client in tcp_server.clients.itervalues():

2027

for client in tcp_server.clients:

2865

2028

if use_dbus:

2866

2029

# Emit D-Bus signal

2867

2030

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2868

# Need to initiate checking of clients

2869

if client.enabled:

2870

client.init_checker()

2031

client.enable()

2871

2032

2872

2033

tcp_server.enable()

2873

2034

tcp_server.server_activate()

2874

2035

2875

2036

# Find out what port we got

2876

if zeroconf:

2877

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

2037

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

2878

2038

if use_ipv6:

2879

2039

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

2880

" flowinfo %d, scope_id %d",

2881

*tcp_server.socket.getsockname())

2040

" flowinfo %d, scope_id %d"

2041

% tcp_server.socket.getsockname())

2882

2042

else: # IPv4

2883

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

2884

*tcp_server.socket.getsockname())

2043

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

2044

% tcp_server.socket.getsockname())

2885

2045

2886

2046

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

2887

2047

2888

2048

try:

2889

if zeroconf:

2890

# From the Avahi example code

2891

try:

2892

service.activate()

2893

except dbus.exceptions.DBusException as error:

2894

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

2895

cleanup()

2896

sys.exit(1)

2897

# End of Avahi example code

2049

# From the Avahi example code

2050

try:

2051

service.activate()

2052

except dbus.exceptions.DBusException as error:

2053

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

2054

cleanup()

2055

sys.exit(1)

2056

# End of Avahi example code

2898

2057

2899

2058

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

2900

2059

lambda *args, **kwargs:

2904

2063

logger.debug("Starting main loop")

2905

2064

main_loop.run()

2906

2065

except AvahiError as error:

2907

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

2066

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

2908

2067

cleanup()

2909

2068

sys.exit(1)

2910

2069

except KeyboardInterrupt:

2915

2074

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

2916

2075

cleanup()

2917

2076

2918

2919

2077

if __name__ == '__main__':

2920

2078

main()