/mandos/release : revision 237.7.35

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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"""

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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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}

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bad_states = { avahi.SERVER_INVALID:

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"Zeroconf server invalid",

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avahi.SERVER_REGISTERING: None,

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avahi.SERVER_COLLISION:

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"Zeroconf server name collision",

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avahi.SERVER_FAILURE:

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"Zeroconf server failure" }

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if state in bad_states:

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if bad_states[state] is not None:

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if error is None:

401

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

402

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else:

403

253

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

404

405

254

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

264

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

426

427

def call_pipe(connection, # : multiprocessing.Connection

428

func, *args, **kwargs):

429

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

430

431

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

432

return value on the provided multiprocessing.Connection.

433

"""

434

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

435

connection.close()

436

437

267

class Client(object):

438

268

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

439

269

440

270

Attributes:

441

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

271

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

442

272

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

443

273

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

444

274

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

451

281

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

452

282

checker_initiator_tag: a gobject event source tag, or None

453

283

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

454

client_structure: Object describing what attributes a client has

455

and is used for storing the client at exit

456

284

current_checker_command: string; current running checker_command

285

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

457

286

disable_initiator_tag: a gobject event source tag, or None

458

287

enabled: bool()

459

288

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

462

291

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

463

292

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

464

293

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

465

last_checker_status: integer between 0 and 255 reflecting exit

466

status of last checker. -1 reflects crashed

467

checker, -2 means no checker completed yet.

468

last_checker_signal: The signal which killed the last checker, if

469

last_checker_status is -1

470

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

294

last_enabled: datetime.datetime(); (UTC)

471

295

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

472

296

D-Bus identifiers

473

297

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

474

298

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

475

299

until this client is disabled

476

extended_timeout: extra long timeout when secret has been sent

477

300

runtime_expansions: Allowed attributes for runtime expansion.

478

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

479

disabled, or None

480

server_settings: The server_settings dict from main()

481

301

"""

482

302

483

303

runtime_expansions = ("approval_delay", "approval_duration",

484

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

485

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

486

"last_approval_request", "last_checked_ok",

304

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

305

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

487

306

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

488

client_defaults = {

489

"timeout": "PT5M",

490

"extended_timeout": "PT15M",

491

"interval": "PT2M",

492

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

493

"host": "",

494

"approval_delay": "PT0S",

495

"approval_duration": "PT1S",

496

"approved_by_default": "True",

497

"enabled": "True",

498

}

499

307

500

308

@staticmethod

501

def config_parser(config):

502

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

503

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

504

with exceptions for any special settings as defined above.

505

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

506

value given the same arguments.

507

"""

508

settings = {}

509

for client_name in config.sections():

510

section = dict(config.items(client_name))

511

client = settings[client_name] = {}

512

513

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

514

# Reformat values from string types to Python types

515

client["approved_by_default"] = config.getboolean(

516

client_name, "approved_by_default")

517

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

518

"enabled")

519

520

# Uppercase and remove spaces from fingerprint for later

521

# comparison purposes with return value from the

522

# fingerprint() function

523

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

524

.replace(" ", ""))

525

if "secret" in section:

526

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

527

elif "secfile" in section:

528

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

529

(section["secfile"])),

530

"rb") as secfile:

531

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

532

else:

533

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

534

.format(section))

535

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

536

client["extended_timeout"] = string_to_delta(

537

section["extended_timeout"])

538

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

539

client["approval_delay"] = string_to_delta(

540

section["approval_delay"])

541

client["approval_duration"] = string_to_delta(

542

section["approval_duration"])

543

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

544

client["last_approval_request"] = None

545

client["last_checked_ok"] = None

546

client["last_checker_status"] = -2

547

548

return settings

549

550

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."""

551

330

self.name = name

552

if server_settings is None:

553

server_settings = {}

554

self.server_settings = server_settings

555

# adding all client settings

556

for setting, value in settings.items():

557

setattr(self, setting, value)

558

559

if self.enabled:

560

if not hasattr(self, "last_enabled"):

561

self.last_enabled = datetime.datetime.utcnow()

562

if not hasattr(self, "expires"):

563

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

564

+ self.timeout)

565

else:

566

self.last_enabled = None

567

self.expires = None

568

331

if config is None:

332

config = {}

569

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(" ", ""))

570

339

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

571

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

572

datetime.datetime.utcnow())

573

574

# 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

575

359

self.checker = None

576

360

self.checker_initiator_tag = None

577

361

self.disable_initiator_tag = None

578

362

self.checker_callback_tag = None

363

self.checker_command = config["checker"]

579

364

self.current_checker_command = None

580

self.approved = None

365

self.last_connect = None

366

self._approved = None

367

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

368

True)

581

369

self.approvals_pending = 0

582

self.changedstate = multiprocessing_manager.Condition(

583

multiprocessing_manager.Lock())

584

self.client_structure = [attr

585

for attr in self.__dict__.iterkeys()

586

if not attr.startswith("_")]

587

self.client_structure.append("client_structure")

588

589

for name, t in inspect.getmembers(

590

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

591

if not name.startswith("_"):

592

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())

593

375

594

# Send notice to process children that client state has changed

595

376

def send_changedstate(self):

596

with self.changedstate:

597

self.changedstate.notify_all()

598

377

self.changedstate.acquire()

378

self.changedstate.notify_all()

379

self.changedstate.release()

380

599

381

def enable(self):

600

382

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

601

383

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

602

384

# Already enabled

603

385

return

604

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

605

self.enabled = True

386

self.send_changedstate()

606

387

self.last_enabled = datetime.datetime.utcnow()

607

self.init_checker()

608

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()

609

400

610

401

def disable(self, quiet=True):

611

402

"""Disable this client."""

612

403

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

613

404

return False

614

405

if not quiet:

406

self.send_changedstate()

407

if not quiet:

615

408

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

616

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

409

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

617

410

gobject.source_remove(self.disable_initiator_tag)

618

411

self.disable_initiator_tag = None

619

self.expires = None

620

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

412

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

621

413

gobject.source_remove(self.checker_initiator_tag)

622

414

self.checker_initiator_tag = None

623

415

self.stop_checker()

416

if self.disable_hook:

417

self.disable_hook(self)

624

418

self.enabled = False

625

if not quiet:

626

self.send_changedstate()

627

419

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

628

420

return False

629

421

630

422

def __del__(self):

423

self.disable_hook = None

631

424

self.disable()

632

425

633

def init_checker(self):

634

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

635

# and every interval from then on.

636

if self.checker_initiator_tag is not None:

637

gobject.source_remove(self.checker_initiator_tag)

638

self.checker_initiator_tag = gobject.timeout_add(

639

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

640

self.start_checker)

641

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

642

if self.disable_initiator_tag is not None:

643

gobject.source_remove(self.disable_initiator_tag)

644

self.disable_initiator_tag = gobject.timeout_add(

645

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

646

# Also start a new checker *right now*.

647

self.start_checker()

648

649

def checker_callback(self, source, condition, connection,

650

command):

426

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

651

427

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

652

428

self.checker_callback_tag = None

653

429

self.checker = None

654

# Read return code from connection (see call_pipe)

655

returncode = connection.recv()

656

connection.close()

657

658

if returncode >= 0:

659

self.last_checker_status = returncode

660

self.last_checker_signal = None

661

if self.last_checker_status == 0:

430

if os.WIFEXITED(condition):

431

exitstatus = os.WEXITSTATUS(condition)

432

if exitstatus == 0:

662

433

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

663

434

vars(self))

664

435

self.checked_ok()

665

436

else:

666

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

437

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

438

vars(self))

667

439

else:

668

self.last_checker_status = -1

669

self.last_checker_signal = -returncode

670

440

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

671

441

vars(self))

672

return False

673

442

674

443

def checked_ok(self):

675

"""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

"""

676

449

self.last_checked_ok = datetime.datetime.utcnow()

677

self.last_checker_status = 0

678

self.last_checker_signal = None

679

self.bump_timeout()

680

681

def bump_timeout(self, timeout=None):

682

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

683

if timeout is None:

684

timeout = self.timeout

685

if self.disable_initiator_tag is not None:

686

gobject.source_remove(self.disable_initiator_tag)

687

self.disable_initiator_tag = None

688

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

689

self.disable_initiator_tag = gobject.timeout_add(

690

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

691

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))

692

454

693

455

def need_approval(self):

694

456

self.last_approval_request = datetime.datetime.utcnow()

699

461

If a checker already exists, leave it running and do

700

462

nothing."""

701

463

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

702

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

703

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

704

# would inevitably timeout, since no checker would get a

705

# 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

706

468

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

707

469

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

708

470

# should be.

709

471

710

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

711

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

712

self.checker.join()

713

self.checker = None

472

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

473

try:

474

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

475

except (AttributeError, OSError) as error:

476

if (isinstance(error, OSError)

477

and error.errno != errno.ECHILD):

478

raise error

479

else:

480

if pid:

481

logger.warning("Checker was a zombie")

482

gobject.source_remove(self.checker_callback_tag)

483

self.checker_callback(pid, status,

484

self.current_checker_command)

714

485

# Start a new checker if needed

715

486

if self.checker is None:

716

# Escape attributes for the shell

717

escaped_attrs = {

718

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

719

for attr in self.runtime_expansions }

720

487

try:

721

command = self.checker_command % escaped_attrs

722

except TypeError as error:

723

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

724

self.checker_command,

725

exc_info=error)

726

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

727

506

self.current_checker_command = command

728

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

729

self.name)

730

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

731

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

732

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

733

# always replaced by /dev/null.)

734

# The exception is when not debugging but nevertheless

735

# running in the foreground; use the previously

736

# created wnull.

737

popen_args = { "close_fds": True,

738

"shell": True,

739

"cwd": "/" }

740

if (not self.server_settings["debug"]

741

and self.server_settings["foreground"]):

742

popen_args.update({"stdout": wnull,

743

"stderr": wnull })

744

pipe = multiprocessing.Pipe(duplex = False)

745

self.checker = multiprocessing.Process(

746

target = call_pipe,

747

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

748

kwargs = popen_args)

749

self.checker.start()

750

self.checker_callback_tag = gobject.io_add_watch(

751

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

752

self.checker_callback, pipe[0], command)

507

try:

508

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

509

command, self.name)

510

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

511

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

512

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

513

# always replaced by /dev/null.)

514

self.checker = subprocess.Popen(command,

515

close_fds=True,

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.

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)

527

except OSError as error:

528

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

529

error)

753

530

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

754

531

return True

755

532

761

538

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

762

539

return

763

540

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

764

self.checker.terminate()

541

try:

542

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

543

#time.sleep(0.5)

544

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

545

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

546

except OSError as error:

547

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

548

raise

765

549

self.checker = None

766

550

767

768

def dbus_service_property(dbus_interface,

769

signature="v",

770

access="readwrite",

771

byte_arrays=False):

551

def dbus_service_property(dbus_interface, signature="v",

552

access="readwrite", byte_arrays=False):

772

553

"""Decorators for marking methods of a DBusObjectWithProperties to

773

554

become properties on the D-Bus.

774

555

783

564

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

784

565

if byte_arrays and signature != "ay":

785

566

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

786

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

787

567

" signature %r" % signature)

788

568

def decorator(func):

789

569

func._dbus_is_property = True

790

570

func._dbus_interface = dbus_interface

795

575

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

796

576

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

797

577

return func

798

799

return decorator

800

801

802

def dbus_interface_annotations(dbus_interface):

803

"""Decorator for marking functions returning interface annotations

804

805

Usage:

806

807

@dbus_interface_annotations("org.example.Interface")

808

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

809

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

810

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

811

"false"}

812

"""

813

814

def decorator(func):

815

func._dbus_is_interface = True

816

func._dbus_interface = dbus_interface

817

func._dbus_name = dbus_interface

818

return func

819

820

return decorator

821

822

823

def dbus_annotations(annotations):

824

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

825

Usage:

826

827

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

828

"org.freedesktop.DBus.Property."

829

"EmitsChangedSignal": "false"})

830

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

831

access="r")

832

def Property_dbus_property(self):

833

return dbus.Boolean(False)

834

"""

835

836

def decorator(func):

837

func._dbus_annotations = annotations

838

return func

839

840

578

return decorator

841

579

842

580

843

581

class DBusPropertyException(dbus.exceptions.DBusException):

844

582

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

845

583

"""

846

pass

584

def __unicode__(self):

585

return unicode(str(self))

847

586

848

587

849

588

class DBusPropertyAccessException(DBusPropertyException):

860

599

861

600

class DBusObjectWithProperties(dbus.service.Object):

862

601

"""A D-Bus object with properties.

863

602

864

603

Classes inheriting from this can use the dbus_service_property

865

604

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

866

605

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

867

606

"""

868

607

869

608

@staticmethod

870

def _is_dbus_thing(thing):

871

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

872

873

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

874

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

875

"""

876

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

877

False)

609

def _is_dbus_property(obj):

610

return getattr(obj, "_dbus_is_property", False)

878

611

879

def _get_all_dbus_things(self, thing):

612

def _get_all_dbus_properties(self):

880

613

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

881

614

"""

882

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

883

athing.__get__(self))

884

for cls in self.__class__.__mro__

885

for name, athing in

886

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))

887

618

888

619

def _get_dbus_property(self, interface_name, property_name):

889

620

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

890

621

property with the specified name and interface.

891

622

"""

892

for cls in self.__class__.__mro__:

893

for name, value in inspect.getmembers(

894

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

895

if (value._dbus_name == property_name

896

and value._dbus_interface == interface_name):

897

return value.__get__(self)

898

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

899

633

# No such property

900

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

901

self.dbus_object_path, interface_name, property_name))

634

raise DBusPropertyNotFound(self.dbus_object_path + ":"

635

+ interface_name + "."

636

+ property_name)

902

637

903

@dbus.service.method(dbus.PROPERTIES_IFACE,

904

in_signature="ss",

638

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

905

639

out_signature="v")

906

640

def Get(self, interface_name, property_name):

907

641

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

925

659

# The byte_arrays option is not supported yet on

926

660

# signatures other than "ay".

927

661

if prop._dbus_signature != "ay":

928

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

929

"'ay' signature {!r}"

930

.format(prop._dbus_signature))

931

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

932

for byte in value))

662

raise ValueError

663

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

664

for byte in value))

933

665

prop(value)

934

666

935

@dbus.service.method(dbus.PROPERTIES_IFACE,

936

in_signature="s",

667

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

937

668

out_signature="a{sv}")

938

669

def GetAll(self, interface_name):

939

670

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

940

671

standard.

941

672

942

673

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

943

674

"""

944

properties = {}

945

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

675

all = {}

676

for name, prop in self._get_all_dbus_properties():

946

677

if (interface_name

947

678

and interface_name != prop._dbus_interface):

948

679

# Interface non-empty but did not match

952

683

continue

953

684

value = prop()

954

685

if not hasattr(value, "variant_level"):

955

properties[name] = value

686

all[name] = value

956

687

continue

957

properties[name] = type(value)(

958

value, variant_level = value.variant_level + 1)

959

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

960

961

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

962

def PropertiesChanged(self, interface_name, changed_properties,

963

invalidated_properties):

964

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

965

standard.

966

"""

967

pass

688

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

689

value.variant_level+1)

690

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

968

691

969

692

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

970

693

out_signature="s",

971

694

path_keyword='object_path',

972

695

connection_keyword='connection')

973

696

def Introspect(self, object_path, connection):

974

"""Overloading of standard D-Bus method.

975

976

Inserts property tags and interface annotation tags.

697

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

977

698

"""

978

699

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

979

700

connection)

980

701

try:

981

702

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

982

983

703

def make_tag(document, name, prop):

984

704

e = document.createElement("property")

985

705

e.setAttribute("name", name)

986

706

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

987

707

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

988

708

return e

989

990

709

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

991

# Add property tags

992

710

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

993

711

for name, prop

994

in self._get_all_dbus_things("property")

712

in self._get_all_dbus_properties()

995

713

if prop._dbus_interface

996

714

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

997

715

if_tag.appendChild(tag)

998

# Add annotation tags

999

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

1000

for tag in if_tag.getElementsByTagName(typ):

1001

annots = dict()

1002

for name, prop in (self.

1003

_get_all_dbus_things(typ)):

1004

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

1005

and prop._dbus_interface

1006

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

1007

annots.update(getattr(

1008

prop, "_dbus_annotations", {}))

1009

for name, value in annots.items():

1010

ann_tag = document.createElement(

1011

"annotation")

1012

ann_tag.setAttribute("name", name)

1013

ann_tag.setAttribute("value", value)

1014

tag.appendChild(ann_tag)

1015

# Add interface annotation tags

1016

for annotation, value in dict(

1017

itertools.chain.from_iterable(

1018

annotations().items()

1019

for name, annotations

1020

in self._get_all_dbus_things("interface")

1021

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

1022

)).items():

1023

ann_tag = document.createElement("annotation")

1024

ann_tag.setAttribute("name", annotation)

1025

ann_tag.setAttribute("value", value)

1026

if_tag.appendChild(ann_tag)

1027

716

# Add the names to the return values for the

1028

717

# "org.freedesktop.DBus.Properties" methods

1029

718

if (if_tag.getAttribute("name")

1044

733

except (AttributeError, xml.dom.DOMException,

1045

734

xml.parsers.expat.ExpatError) as error:

1046

735

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

1047

exc_info=error)

736

error)

1048

737

return xmlstring

1049

738

1050

739

1051

def datetime_to_dbus(dt, variant_level=0):

1052

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

1053

if dt is None:

1054

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

1055

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

1056

1057

1058

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1059

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

1060

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

1061

interface names according to the "alt_interface_names" mapping.

1062

Usage:

1063

1064

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

1065

"net.example.AlternateInterface"})

1066

class SampleDBusObject(dbus.service.Object):

1067

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

1068

def SampleDBusMethod():

1069

pass

1070

1071

The above "SampleDBusMethod" on "SampleDBusObject" will be

1072

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

1073

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

1074

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

1075

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

1076

1077

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

1078

(from DBusObjectWithProperties) and interfaces (from the

1079

dbus_interface_annotations decorator).

1080

"""

1081

1082

def wrapper(cls):

1083

for orig_interface_name, alt_interface_name in (

1084

alt_interface_names.items()):

1085

attr = {}

1086

interface_names = set()

1087

# Go though all attributes of the class

1088

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

1089

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

1090

# with the wrong interface name

1091

if (not hasattr(attribute, "_dbus_interface")

1092

or not attribute._dbus_interface.startswith(

1093

orig_interface_name)):

1094

continue

1095

# Create an alternate D-Bus interface name based on

1096

# the current name

1097

alt_interface = attribute._dbus_interface.replace(

1098

orig_interface_name, alt_interface_name)

1099

interface_names.add(alt_interface)

1100

# Is this a D-Bus signal?

1101

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

1102

if sys.version_info.major == 2:

1103

# Extract the original non-method undecorated

1104

# function by black magic

1105

nonmethod_func = (dict(

1106

zip(attribute.func_code.co_freevars,

1107

attribute.__closure__))

1108

["func"].cell_contents)

1109

else:

1110

nonmethod_func = attribute

1111

# Create a new, but exactly alike, function

1112

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

1113

# with the alternate D-Bus interface name

1114

if sys.version_info.major == 2:

1115

new_function = types.FunctionType(

1116

nonmethod_func.func_code,

1117

nonmethod_func.func_globals,

1118

nonmethod_func.func_name,

1119

nonmethod_func.func_defaults,

1120

nonmethod_func.func_closure)

1121

else:

1122

new_function = types.FunctionType(

1123

nonmethod_func.__code__,

1124

nonmethod_func.__globals__,

1125

nonmethod_func.__name__,

1126

nonmethod_func.__defaults__,

1127

nonmethod_func.__closure__)

1128

new_function = (dbus.service.signal(

1129

alt_interface,

1130

attribute._dbus_signature)(new_function))

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:

1356

817

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

1357

818

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

1358

819

1359

def checker_callback(self, source, condition,

1360

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

1361

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

1362

connection, command, *args,

1363

**kwargs)

1364

exitstatus = self.last_checker_status

1365

if exitstatus >= 0:

820

def checker_callback(self, pid, condition, command,

821

*args, **kwargs):

822

self.checker_callback_tag = None

823

self.checker = None

824

# Emit D-Bus signal

825

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

826

dbus.Boolean(False, variant_level=1))

827

if os.WIFEXITED(condition):

828

exitstatus = os.WEXITSTATUS(condition)

1366

829

# Emit D-Bus signal

1367

830

self.CheckerCompleted(dbus.Int16(exitstatus),

1368

dbus.Int64(0),

831

dbus.Int64(condition),

1369

832

dbus.String(command))

1370

833

else:

1371

834

# Emit D-Bus signal

1372

835

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

1373

dbus.Int64(

1374

self.last_checker_signal),

836

dbus.Int64(condition),

1375

837

dbus.String(command))

1376

return ret

838

839

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

840

*args, **kwargs)

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

1377

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

if isinstance(client_object.__getattribute__(attrname),

2145

collections.Callable):

2146

parent_pipe.send(('function', ))

1597

if callable(client_object.__getattribute__(attrname)):

1598

parent_pipe.send(('function',))

2147

1599

else:

2148

parent_pipe.send((

2149

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

1600

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

2150

1601

2151

1602

if command == 'setattr':

2152

1603

attrname = request[1]

2153

1604

value = request[2]

2154

1605

setattr(client_object, attrname, value)

2155

1606

2156

1607

return True

2157

1608

2158

1609

2159

def rfc3339_duration_to_delta(duration):

2160

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

2161

2162

>>> rfc3339_duration_to_delta("P7D")

2163

datetime.timedelta(7)

2164

>>> rfc3339_duration_to_delta("PT60S")

2165

datetime.timedelta(0, 60)

2166

>>> rfc3339_duration_to_delta("PT60M")

2167

datetime.timedelta(0, 3600)

2168

>>> rfc3339_duration_to_delta("PT24H")

2169

datetime.timedelta(1)

2170

>>> rfc3339_duration_to_delta("P1W")

2171

datetime.timedelta(7)

2172

>>> rfc3339_duration_to_delta("PT5M30S")

2173

datetime.timedelta(0, 330)

2174

>>> rfc3339_duration_to_delta("P1DT3M20S")

2175

datetime.timedelta(1, 200)

2176

"""

2177

2178

# Parsing an RFC 3339 duration with regular expressions is not

2179

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

2180

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

2181

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

2182

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

2183

# avoid excessive use of external libraries.

2184

2185

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

2186

Token = collections.namedtuple("Token", (

2187

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

2188

# a "group" containing digits

2189

"value", # datetime.timedelta or None

2190

"followers")) # Tokens valid after this token

2191

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

2192

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

2193

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

2194

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

2195

datetime.timedelta(seconds=1),

2196

frozenset((token_end, )))

2197

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

2198

datetime.timedelta(minutes=1),

2199

frozenset((token_second, token_end)))

2200

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

2201

datetime.timedelta(hours=1),

2202

frozenset((token_minute, token_end)))

2203

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

2204

None,

2205

frozenset((token_hour, token_minute,

2206

token_second)))

2207

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

2208

datetime.timedelta(days=1),

2209

frozenset((token_time, token_end)))

2210

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

2211

datetime.timedelta(weeks=4),

2212

frozenset((token_day, token_end)))

2213

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

2214

datetime.timedelta(weeks=52),

2215

frozenset((token_month, token_end)))

2216

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

2217

datetime.timedelta(weeks=1),

2218

frozenset((token_end, )))

2219

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

2220

frozenset((token_year, token_month,

2221

token_day, token_time,

2222

token_week)))

2223

# Define starting values

2224

value = datetime.timedelta() # Value so far

2225

found_token = None

2226

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

2227

s = duration # String left to parse

2228

# Loop until end token is found

2229

while found_token is not token_end:

2230

# Search for any currently valid tokens

2231

for token in followers:

2232

match = token.regexp.match(s)

2233

if match is not None:

2234

# Token found

2235

if token.value is not None:

2236

# Value found, parse digits

2237

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

2238

# Add to value so far

2239

value += factor * token.value

2240

# Strip token from string

2241

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

2242

# Go to found token

2243

found_token = token

2244

# Set valid next tokens

2245

followers = found_token.followers

2246

break

2247

else:

2248

# No currently valid tokens were found

2249

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

2250

.format(duration))

2251

# End token found

2252

return value

2253

2254

2255

1610

def string_to_delta(interval):

2256

1611

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

2257

1612

2268

1623

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

2269

1624

datetime.timedelta(0, 330)

2270

1625

"""

2271

2272

try:

2273

return rfc3339_duration_to_delta(interval)

2274

except ValueError:

2275

pass

2276

2277

1626

timevalue = datetime.timedelta(0)

2278

1627

for s in interval.split():

2279

1628

try:

2280

suffix = s[-1]

1629

suffix = unicode(s[-1])

2281

1630

value = int(s[:-1])

2282

1631

if suffix == "d":

2283

1632

delta = datetime.timedelta(value)

2290

1639

elif suffix == "w":

2291

1640

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

2292

1641

else:

2293

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

2294

except IndexError as e:

1642

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

1643

except (ValueError, IndexError) as e:

2295

1644

raise ValueError(*(e.args))

2296

1645

timevalue += delta

2297

1646

return timevalue

2298

1647

2299

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

2300

1673

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

2301

1674

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

2302

1675

2310

1683

sys.exit()

2311

1684

if not noclose:

2312

1685

# Close all standard open file descriptors

2313

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

1686

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

2314

1687

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

2315

1688

raise OSError(errno.ENODEV,

2316

"{} not a character device"

2317

.format(os.devnull))

1689

"%s not a character device"

1690

% os.path.devnull)

2318

1691

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

2319

1692

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

2320

1693

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

2329

1702

2330

1703

parser = argparse.ArgumentParser()

2331

1704

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

2332

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

1705

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

2333

1706

help="show version number and exit")

2334

1707

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

2335

1708

help="Bind to interface IF")

2341

1714

help="Run self-test")

2342

1715

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

2343

1716

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

2344

" to terminal", default=None)

1717

" to terminal")

2345

1718

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

2346

1719

help="Debug level for stdout output")

2347

1720

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

2354

1727

" files")

2355

1728

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

2356

1729

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

2357

" system bus interface", default=None)

1730

" system bus interface")

2358

1731

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

2359

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

2360

default=None)

2361

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

2362

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

2363

" state", default=None)

2364

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

2365

help="Specify a file descriptor to a network"

2366

" socket to use instead of creating one")

2367

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

2368

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

2369

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

2370

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

2371

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

2372

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

2373

default=None)

2374

1732

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

2375

1733

options = parser.parse_args()

2376

1734

2377

1735

if options.check:

2378

1736

import doctest

2379

fail_count, test_count = doctest.testmod()

2380

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

1737

doctest.testmod()

1738

sys.exit()

2381

1739

2382

1740

# Default values for config file for server-global settings

2383

1741

server_defaults = { "interface": "",

2385

1743

"port": "",

2386

1744

"debug": "False",

2387

1745

"priority":

2388

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

2389

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

1746

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

2390

1747

"servicename": "Mandos",

2391

1748

"use_dbus": "True",

2392

1749

"use_ipv6": "True",

2393

1750

"debuglevel": "",

2394

"restore": "True",

2395

"socket": "",

2396

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

2397

"foreground": "False",

2398

"zeroconf": "True",

2399

}

1751

}

2400

1752

2401

1753

# Parse config file for server-global settings

2402

1754

server_config = configparser.SafeConfigParser(server_defaults)

2403

1755

del server_defaults

2404

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

1756

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

1757

"mandos.conf"))

2405

1758

# Convert the SafeConfigParser object to a dict

2406

1759

server_settings = server_config.defaults()

2407

1760

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

2408

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

1761

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

2409

1762

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

2410

1763

option)

2411

1764

if server_settings["port"]:

2412

1765

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

2413

1766

"port")

2414

if server_settings["socket"]:

2415

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

2416

"socket")

2417

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

2418

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

2419

# happen with a supplied network socket.

2420

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

2421

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

2422

["socket"])

2423

1767

del server_config

2424

1768

2425

1769

# Override the settings from the config file with command line

2426

1770

# options, if set.

2427

1771

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

2428

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

2429

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

2430

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

1772

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

1773

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

2431

1774

value = getattr(options, option)

2432

1775

if value is not None:

2433

1776

server_settings[option] = value

2434

1777

del options

2435

1778

# Force all strings to be unicode

2436

1779

for option in server_settings.keys():

2437

if isinstance(server_settings[option], bytes):

2438

server_settings[option] = (server_settings[option]

2439

.decode("utf-8"))

2440

# Force all boolean options to be boolean

2441

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

2442

"foreground", "zeroconf"):

2443

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

2444

# Debug implies foreground

2445

if server_settings["debug"]:

2446

server_settings["foreground"] = True

1780

if type(server_settings[option]) is str:

1781

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

2447

1782

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

2448

1783

2449

1784

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

2450

1785

2451

if (not server_settings["zeroconf"]

2452

and not (server_settings["port"]

2453

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

2454

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

2455

2456

1786

# For convenience

2457

1787

debug = server_settings["debug"]

2458

1788

debuglevel = server_settings["debuglevel"]

2459

1789

use_dbus = server_settings["use_dbus"]

2460

1790

use_ipv6 = server_settings["use_ipv6"]

2461

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

2462

stored_state_file)

2463

foreground = server_settings["foreground"]

2464

zeroconf = server_settings["zeroconf"]

2465

2466

if debug:

2467

initlogger(debug, logging.DEBUG)

2468

else:

2469

if not debuglevel:

2470

initlogger(debug)

2471

else:

2472

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

2473

initlogger(debug, level)

2474

1791

2475

1792

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

2476

syslogger.setFormatter(

2477

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

2478

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

2479

server_settings["servicename"])))

1793

syslogger.setFormatter(logging.Formatter

1794

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

1795

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

1796

% server_settings["servicename"]))

2480

1797

2481

1798

# Parse config file with clients

2482

client_config = configparser.SafeConfigParser(Client

2483

.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)

2484

1807

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

2485

1808

"clients.conf"))

2486

1809

2487

1810

global mandos_dbus_service

2488

1811

mandos_dbus_service = None

2489

1812

2490

socketfd = None

2491

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

2492

socketfd = server_settings["socket"]

2493

tcp_server = MandosServer(

2494

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

2495

ClientHandler,

2496

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

2497

use_ipv6=use_ipv6,

2498

gnutls_priority=server_settings["priority"],

2499

use_dbus=use_dbus,

2500

socketfd=socketfd)

2501

if not foreground:

2502

pidfilename = "/run/mandos.pid"

2503

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

2504

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

2505

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"

2506

1824

try:

2507

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

2508

except IOError as e:

2509

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

2510

exc_info=e)

1825

pidfile = open(pidfilename, "w")

1826

except IOError:

1827

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

2511

1828

2512

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:

2513

1833

try:

2514

uid = pwd.getpwnam(name).pw_uid

2515

gid = pwd.getpwnam(name).pw_gid

2516

break

1834

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

1835

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

2517

1836

except KeyError:

2518

continue

2519

else:

2520

uid = 65534

2521

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

2522

1843

try:

2523

1844

os.setgid(gid)

2524

1845

os.setuid(uid)

2525

1846

except OSError as error:

2526

if error.errno != errno.EPERM:

2527

raise

1847

if error[0] != errno.EPERM:

1848

raise error

2528

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

2529

1858

if debug:

2530

1859

# Enable all possible GnuTLS debugging

2531

1860

2537

1866

def debug_gnutls(level, string):

2538

1867

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

2539

1868

2540

gnutls.library.functions.gnutls_global_set_log_function(

2541

debug_gnutls)

1869

(gnutls.library.functions

1870

.gnutls_global_set_log_function(debug_gnutls))

2542

1871

2543

1872

# Redirect stdin so all checkers get /dev/null

2544

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

1873

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

2545

1874

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

2546

1875

if null > 2:

2547

1876

os.close(null)

1877

else:

1878

# No console logging

1879

logger.removeHandler(console)

2548

1880

2549

1881

# Need to fork before connecting to D-Bus

2550

if not foreground:

1882

if not debug:

2551

1883

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

2552

1884

daemon()

2553

1885

2554

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

2555

# need to inform gobject that threads will be used.

2556

gobject.threads_init()

2557

2558

1886

global main_loop

2559

1887

# From the Avahi example code

2560

DBusGMainLoop(set_as_default=True)

1888

DBusGMainLoop(set_as_default=True )

2561

1889

main_loop = gobject.MainLoop()

2562

1890

bus = dbus.SystemBus()

2563

1891

# End of Avahi example code

2564

1892

if use_dbus:

2565

1893

try:

2566

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

2567

bus,

2568

do_not_queue=True)

2569

old_bus_name = dbus.service.BusName(

2570

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

2571

do_not_queue=True)

2572

except dbus.exceptions.DBusException as e:

2573

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")

2574

1898

use_dbus = False

2575

1899

server_settings["use_dbus"] = False

2576

1900

tcp_server.use_dbus = False

2577

if zeroconf:

2578

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2579

service = AvahiServiceToSyslog(

2580

name = server_settings["servicename"],

2581

servicetype = "_mandos._tcp",

2582

protocol = protocol,

2583

bus = bus)

2584

if server_settings["interface"]:

2585

service.interface = if_nametoindex(

2586

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"])))

2587

1908

2588

1909

global multiprocessing_manager

2589

1910

multiprocessing_manager = multiprocessing.Manager()

2591

1912

client_class = Client

2592

1913

if use_dbus:

2593

1914

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

2594

2595

client_settings = Client.config_parser(client_config)

2596

old_client_settings = {}

2597

clients_data = {}

2598

2599

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

2600

global wnull

2601

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

2602

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

2603

# mode

2604

if debug or not foreground:

2605

wnull.close()

2606

2607

# Get client data and settings from last running state.

2608

if server_settings["restore"]:

2609

try:

2610

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

2611

clients_data, old_client_settings = pickle.load(

2612

stored_state)

2613

os.remove(stored_state_path)

2614

except IOError as e:

2615

if e.errno == errno.ENOENT:

2616

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

2617

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

2618

else:

2619

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

2620

exc_info=e)

2621

raise

2622

except EOFError as e:

2623

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

2624

"EOFError:",

2625

exc_info=e)

2626

2627

with PGPEngine() as pgp:

2628

for client_name, client in clients_data.items():

2629

# Skip removed clients

2630

if client_name not in client_settings:

2631

continue

2632

2633

# Decide which value to use after restoring saved state.

2634

# We have three different values: Old config file,

2635

# new config file, and saved state.

2636

# New config value takes precedence if it differs from old

2637

# config value, otherwise use saved state.

2638

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

2639

try:

2640

# For each value in new config, check if it

2641

# differs from the old config value (Except for

2642

# the "secret" attribute)

2643

if (name != "secret"

2644

and (value !=

2645

old_client_settings[client_name][name])):

2646

client[name] = value

2647

except KeyError:

2648

pass

2649

2650

# Clients who has passed its expire date can still be

2651

# enabled if its last checker was successful. A Client

2652

# whose checker succeeded before we stored its state is

2653

# assumed to have successfully run all checkers during

2654

# downtime.

2655

if client["enabled"]:

2656

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

2657

if not client["last_checked_ok"]:

2658

logger.warning(

2659

"disabling client {} - Client never "

2660

"performed a successful checker".format(

2661

client_name))

2662

client["enabled"] = False

2663

elif client["last_checker_status"] != 0:

2664

logger.warning(

2665

"disabling client {} - Client last"

2666

" checker failed with error code"

2667

" {}".format(

2668

client_name,

2669

client["last_checker_status"]))

2670

client["enabled"] = False

2671

else:

2672

client["expires"] = (

2673

datetime.datetime.utcnow()

2674

+ client["timeout"])

2675

logger.debug("Last checker succeeded,"

2676

" keeping {} enabled".format(

2677

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):

2678

1922

try:

2679

client["secret"] = pgp.decrypt(

2680

client["encrypted_secret"],

2681

client_settings[client_name]["secret"])

2682

except PGPError:

2683

# If decryption fails, we use secret from new settings

2684

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

2685

client_name))

2686

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

2687

["secret"])

2688

2689

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

2690

for client_name in (set(old_client_settings)

2691

- set(client_settings)):

2692

del clients_data[client_name]

2693

for client_name in (set(client_settings)

2694

- set(old_client_settings)):

2695

clients_data[client_name] = client_settings[client_name]

2696

2697

# Create all client objects

2698

for client_name, client in clients_data.items():

2699

tcp_server.clients[client_name] = client_class(

2700

name = client_name,

2701

settings = client,

2702

server_settings = server_settings)

2703

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()))

2704

1932

if not tcp_server.clients:

2705

1933

logger.warning("No clients defined")

2706

2707

if not foreground:

2708

if pidfile is not None:

2709

pid = os.getpid()

2710

try:

2711

with pidfile:

2712

print(pid, file=pidfile)

2713

except IOError:

2714

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

2715

pidfilename, pid)

2716

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

2717

1947

del pidfilename

2718

1948

1949

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

1950

2719

1951

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

2720

1952

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

2721

1953

2722

1954

if use_dbus:

2723

2724

@alternate_dbus_interfaces(

2725

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

2726

class MandosDBusService(DBusObjectWithProperties):

1955

class MandosDBusService(dbus.service.Object):

2727

1956

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

2728

2729

1957

def __init__(self):

2730

1958

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

2731

2732

_interface = "se.recompile.Mandos"

2733

2734

@dbus_interface_annotations(_interface)

2735

def _foo(self):

2736

return {

2737

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

2738

"false" }

1959

_interface = "se.bsnet.fukt.Mandos"

2739

1960

2740

1961

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

2741

1962

def ClientAdded(self, objpath):

2755

1976

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

2756

1977

def GetAllClients(self):

2757

1978

"D-Bus method"

2758

return dbus.Array(c.dbus_object_path for c in

2759

tcp_server.clients.itervalues())

1979

return dbus.Array(c.dbus_object_path

1980

for c in tcp_server.clients)

2760

1981

2761

1982

@dbus.service.method(_interface,

2762

1983

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

2763

1984

def GetAllClientsWithProperties(self):

2764

1985

"D-Bus method"

2765

1986

return dbus.Dictionary(

2766

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

2767

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

1987

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

1988

for c in tcp_server.clients),

2768

1989

signature="oa{sv}")

2769

1990

2770

1991

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

2771

1992

def RemoveClient(self, object_path):

2772

1993

"D-Bus method"

2773

for c in tcp_server.clients.itervalues():

1994

for c in tcp_server.clients:

2774

1995

if c.dbus_object_path == object_path:

2775

del tcp_server.clients[c.name]

1996

tcp_server.clients.remove(c)

2776

1997

c.remove_from_connection()

2777

1998

# Don't signal anything except ClientRemoved

2778

1999

c.disable(quiet=True)

2787

2008

2788

2009

def cleanup():

2789

2010

"Cleanup function; run on exit"

2790

if zeroconf:

2791

service.cleanup()

2792

2793

multiprocessing.active_children()

2794

wnull.close()

2795

if not (tcp_server.clients or client_settings):

2796

return

2797

2798

# Store client before exiting. Secrets are encrypted with key

2799

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

2800

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

2801

clients = {}

2802

with PGPEngine() as pgp:

2803

for client in tcp_server.clients.itervalues():

2804

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

2805

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

2806

key)

2807

client_dict = {}

2808

2809

# A list of attributes that can not be pickled

2810

# + secret.

2811

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

2812

"checker", "server_settings" }

2813

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

2814

.Object):

2815

exclude.add(name)

2816

2817

client_dict["encrypted_secret"] = (client

2818

.encrypted_secret)

2819

for attr in client.client_structure:

2820

if attr not in exclude:

2821

client_dict[attr] = getattr(client, attr)

2822

2823

clients[client.name] = client_dict

2824

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

2825

2826

try:

2827

with tempfile.NamedTemporaryFile(

2828

mode='wb',

2829

suffix=".pickle",

2830

prefix='clients-',

2831

dir=os.path.dirname(stored_state_path),

2832

delete=False) as stored_state:

2833

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

2834

tempname = stored_state.name

2835

os.rename(tempname, stored_state_path)

2836

except (IOError, OSError) as e:

2837

if not debug:

2838

try:

2839

os.remove(tempname)

2840

except NameError:

2841

pass

2842

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

2843

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

2844

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

2845

else:

2846

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

2847

exc_info=e)

2848

raise

2849

2850

# Delete all clients, and settings from config

2011

service.cleanup()

2012

2851

2013

while tcp_server.clients:

2852

name, client = tcp_server.clients.popitem()

2014

client = tcp_server.clients.pop()

2853

2015

if use_dbus:

2854

2016

client.remove_from_connection()

2017

client.disable_hook = None

2855

2018

# Don't signal anything except ClientRemoved

2856

2019

client.disable(quiet=True)

2857

2020

if use_dbus:

2858

2021

# Emit D-Bus signal

2859

mandos_dbus_service.ClientRemoved(

2860

client.dbus_object_path, client.name)

2861

client_settings.clear()

2022

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2023

client.name)

2862

2024

2863

2025

atexit.register(cleanup)

2864

2026

2865

for client in tcp_server.clients.itervalues():

2027

for client in tcp_server.clients:

2866

2028

if use_dbus:

2867

2029

# Emit D-Bus signal

2868

2030

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2869

# Need to initiate checking of clients

2870

if client.enabled:

2871

client.init_checker()

2031

client.enable()

2872

2032

2873

2033

tcp_server.enable()

2874

2034

tcp_server.server_activate()

2875

2035

2876

2036

# Find out what port we got

2877

if zeroconf:

2878

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

2037

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

2879

2038

if use_ipv6:

2880

2039

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

2881

" flowinfo %d, scope_id %d",

2882

*tcp_server.socket.getsockname())

2040

" flowinfo %d, scope_id %d"

2041

% tcp_server.socket.getsockname())

2883

2042

else: # IPv4

2884

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

2885

*tcp_server.socket.getsockname())

2043

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

2044

% tcp_server.socket.getsockname())

2886

2045

2887

2046

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

2888

2047

2889

2048

try:

2890

if zeroconf:

2891

# From the Avahi example code

2892

try:

2893

service.activate()

2894

except dbus.exceptions.DBusException as error:

2895

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

2896

cleanup()

2897

sys.exit(1)

2898

# 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

2899

2057

2900

2058

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

2901

2059

lambda *args, **kwargs:

2905

2063

logger.debug("Starting main loop")

2906

2064

main_loop.run()

2907

2065

except AvahiError as error:

2908

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

2066

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

2909

2067

cleanup()

2910

2068

sys.exit(1)

2911

2069

except KeyboardInterrupt:

2916

2074

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

2917

2075

cleanup()

2918

2076

2919

2920

2077

if __name__ == '__main__':

2921

2078

main()