/mandos/trunk : revision 481

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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.group = None # our entry group

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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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except dbus.exceptions.DBusException, error:

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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.remove()

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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if self.group is None:

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self.group = dbus.Interface(

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self.bus.get_object(avahi.DBUS_NAME,

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self.server.EntryGroupNew()),

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.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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self.group.connect_to_signal('StateChanged',

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self

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.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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pass

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self.group.Free()

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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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def server_state_changed(self, state):

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

383

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

384

bad_states = {

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avahi.SERVER_INVALID: "Zeroconf server invalid",

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avahi.SERVER_REGISTERING: None,

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avahi.SERVER_COLLISION: "Zeroconf server name collision",

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avahi.SERVER_FAILURE: "Zeroconf server failure",

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}

390

if state in bad_states:

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if bad_states[state] is not None:

392

if error is None:

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logger.error(bad_states[state])

394

else:

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

396

self.cleanup()

223

if state == avahi.SERVER_COLLISION:

224

logger.error("Zeroconf server name collision")

225

self.remove()

397

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elif state == avahi.SERVER_RUNNING:

398

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self.add()

399

else:

400

if error is None:

401

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

402

else:

403

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

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def activate(self):

406

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

407

230

if self.server is None:

408

231

self.server = dbus.Interface(

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232

self.bus.get_object(avahi.DBUS_NAME,

410

avahi.DBUS_PATH_SERVER,

411

follow_name_owner_changes=True),

233

avahi.DBUS_PATH_SERVER),

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avahi.DBUS_INTERFACE_SERVER)

413

235

self.server.connect_to_signal("StateChanged",

414

self.server_state_changed)

236

self.server_state_changed)

415

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

416

238

417

239

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class AvahiServiceToSyslog(AvahiService):

419

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

420

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

421

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

422

syslogger.setFormatter(logging.Formatter(

423

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

424

.format(self.name)))

425

return ret

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427

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240

class Client(object):

429

241

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

430

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431

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Attributes:

432

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

244

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

433

245

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

434

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

435

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

442

254

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

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checker_initiator_tag: a gobject event source tag, or None

444

256

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

445

client_structure: Object describing what attributes a client has

446

and is used for storing the client at exit

447

257

current_checker_command: string; current running checker_command

258

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

448

259

disable_initiator_tag: a gobject event source tag, or None

449

260

enabled: bool()

450

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

453

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

454

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

455

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

456

last_checker_status: integer between 0 and 255 reflecting exit

457

status of last checker. -1 reflects crashed

458

checker, -2 means no checker completed yet.

459

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

267

last_enabled: datetime.datetime(); (UTC)

460

268

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

461

269

D-Bus identifiers

462

270

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

463

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

464

272

until this client is disabled

465

extended_timeout: extra long timeout when secret has been sent

466

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runtime_expansions: Allowed attributes for runtime expansion.

467

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

468

disabled, or None

469

server_settings: The server_settings dict from main()

470

274

"""

471

275

472

276

runtime_expansions = ("approval_delay", "approval_duration",

473

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

474

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

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"last_approval_request", "last_checked_ok",

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

278

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

476

279

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

477

client_defaults = {

478

"timeout": "PT5M",

479

"extended_timeout": "PT15M",

480

"interval": "PT2M",

481

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

482

"host": "",

483

"approval_delay": "PT0S",

484

"approval_duration": "PT1S",

485

"approved_by_default": "True",

486

"enabled": "True",

487

}

488

280

489

281

@staticmethod

490

def config_parser(config):

491

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

492

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

493

with exceptions for any special settings as defined above.

494

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

495

value given the same arguments.

496

"""

497

settings = {}

498

for client_name in config.sections():

499

section = dict(config.items(client_name))

500

client = settings[client_name] = {}

501

502

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

503

# Reformat values from string types to Python types

504

client["approved_by_default"] = config.getboolean(

505

client_name, "approved_by_default")

506

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

507

"enabled")

508

509

# Uppercase and remove spaces from fingerprint for later

510

# comparison purposes with return value from the

511

# fingerprint() function

512

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

513

.replace(" ", ""))

514

if "secret" in section:

515

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

516

elif "secfile" in section:

517

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

518

(section["secfile"])),

519

"rb") as secfile:

520

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

521

else:

522

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

523

.format(section))

524

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

525

client["extended_timeout"] = string_to_delta(

526

section["extended_timeout"])

527

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

528

client["approval_delay"] = string_to_delta(

529

section["approval_delay"])

530

client["approval_duration"] = string_to_delta(

531

section["approval_duration"])

532

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

533

client["last_approval_request"] = None

534

client["last_checked_ok"] = None

535

client["last_checker_status"] = -2

536

537

return settings

538

539

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

282

def _timedelta_to_milliseconds(td):

283

"Convert a datetime.timedelta() to milliseconds"

284

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

285

+ (td.seconds * 1000)

286

+ (td.microseconds // 1000))

287

288

def timeout_milliseconds(self):

289

"Return the 'timeout' attribute in milliseconds"

290

return self._timedelta_to_milliseconds(self.timeout)

291

292

def interval_milliseconds(self):

293

"Return the 'interval' attribute in milliseconds"

294

return self._timedelta_to_milliseconds(self.interval)

295

296

def approval_delay_milliseconds(self):

297

return self._timedelta_to_milliseconds(self.approval_delay)

298

299

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

300

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

301

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

302

attribute."""

540

303

self.name = name

541

if server_settings is None:

542

server_settings = {}

543

self.server_settings = server_settings

544

# adding all client settings

545

for setting, value in settings.items():

546

setattr(self, setting, value)

547

548

if self.enabled:

549

if not hasattr(self, "last_enabled"):

550

self.last_enabled = datetime.datetime.utcnow()

551

if not hasattr(self, "expires"):

552

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

553

+ self.timeout)

554

else:

555

self.last_enabled = None

556

self.expires = None

557

304

if config is None:

305

config = {}

558

306

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

307

# Uppercase and remove spaces from fingerprint for later

308

# comparison purposes with return value from the fingerprint()

309

# function

310

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

311

.replace(" ", ""))

559

312

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

560

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

561

datetime.datetime.utcnow())

562

563

# attributes specific for this server instance

313

if "secret" in config:

314

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

315

elif "secfile" in config:

316

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

317

(config["secfile"])),

318

"rb") as secfile:

319

self.secret = secfile.read()

320

else:

321

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

322

% self.name)

323

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

324

self.created = datetime.datetime.utcnow()

325

self.enabled = False

326

self.last_approval_request = None

327

self.last_enabled = None

328

self.last_checked_ok = None

329

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

330

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

331

self.disable_hook = disable_hook

564

332

self.checker = None

565

333

self.checker_initiator_tag = None

566

334

self.disable_initiator_tag = None

567

335

self.checker_callback_tag = None

336

self.checker_command = config["checker"]

568

337

self.current_checker_command = None

569

self.approved = None

338

self.last_connect = None

339

self._approved = None

340

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

341

True)

570

342

self.approvals_pending = 0

571

self.changedstate = multiprocessing_manager.Condition(

572

multiprocessing_manager.Lock())

573

self.client_structure = [attr

574

for attr in self.__dict__.iterkeys()

575

if not attr.startswith("_")]

576

self.client_structure.append("client_structure")

577

578

for name, t in inspect.getmembers(

579

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

580

if not name.startswith("_"):

581

self.client_structure.append(name)

343

self.approval_delay = string_to_delta(

344

config["approval_delay"])

345

self.approval_duration = string_to_delta(

346

config["approval_duration"])

347

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

582

348

583

# Send notice to process children that client state has changed

584

349

def send_changedstate(self):

585

with self.changedstate:

586

self.changedstate.notify_all()

587

350

self.changedstate.acquire()

351

self.changedstate.notify_all()

352

self.changedstate.release()

353

588

354

def enable(self):

589

355

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

590

356

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

591

357

# Already enabled

592

358

return

593

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

594

self.enabled = True

359

self.send_changedstate()

595

360

self.last_enabled = datetime.datetime.utcnow()

596

self.init_checker()

597

self.send_changedstate()

361

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

362

# and every interval from then on.

363

self.checker_initiator_tag = (gobject.timeout_add

364

(self.interval_milliseconds(),

365

self.start_checker))

366

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

367

self.disable_initiator_tag = (gobject.timeout_add

368

(self.timeout_milliseconds(),

369

self.disable))

370

self.enabled = True

371

# Also start a new checker *right now*.

372

self.start_checker()

598

373

599

374

def disable(self, quiet=True):

600

375

"""Disable this client."""

601

376

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

602

377

return False

603

378

if not quiet:

379

self.send_changedstate()

380

if not quiet:

604

381

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

605

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

382

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

606

383

gobject.source_remove(self.disable_initiator_tag)

607

384

self.disable_initiator_tag = None

608

self.expires = None

609

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

385

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

610

386

gobject.source_remove(self.checker_initiator_tag)

611

387

self.checker_initiator_tag = None

612

388

self.stop_checker()

389

if self.disable_hook:

390

self.disable_hook(self)

613

391

self.enabled = False

614

if not quiet:

615

self.send_changedstate()

616

392

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

617

393

return False

618

394

619

395

def __del__(self):

396

self.disable_hook = None

620

397

self.disable()

621

398

622

def init_checker(self):

623

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

624

# and every interval from then on.

625

if self.checker_initiator_tag is not None:

626

gobject.source_remove(self.checker_initiator_tag)

627

self.checker_initiator_tag = gobject.timeout_add(

628

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

629

self.start_checker)

630

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

631

if self.disable_initiator_tag is not None:

632

gobject.source_remove(self.disable_initiator_tag)

633

self.disable_initiator_tag = gobject.timeout_add(

634

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

635

# Also start a new checker *right now*.

636

self.start_checker()

637

638

399

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

639

400

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

640

401

self.checker_callback_tag = None

641

402

self.checker = None

642

403

if os.WIFEXITED(condition):

643

self.last_checker_status = os.WEXITSTATUS(condition)

644

if self.last_checker_status == 0:

404

exitstatus = os.WEXITSTATUS(condition)

405

if exitstatus == 0:

645

406

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

646

407

vars(self))

647

408

self.checked_ok()

648

409

else:

649

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

410

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

411

vars(self))

650

412

else:

651

self.last_checker_status = -1

652

413

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

653

414

vars(self))

654

415

655

416

def checked_ok(self):

656

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

417

"""Bump up the timeout for this client.

418

419

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

420

alive and well.

421

"""

657

422

self.last_checked_ok = datetime.datetime.utcnow()

658

self.last_checker_status = 0

659

self.bump_timeout()

660

661

def bump_timeout(self, timeout=None):

662

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

663

if timeout is None:

664

timeout = self.timeout

665

if self.disable_initiator_tag is not None:

666

gobject.source_remove(self.disable_initiator_tag)

667

self.disable_initiator_tag = None

668

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

669

self.disable_initiator_tag = gobject.timeout_add(

670

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

671

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

423

gobject.source_remove(self.disable_initiator_tag)

424

self.disable_initiator_tag = (gobject.timeout_add

425

(self.timeout_milliseconds(),

426

self.disable))

672

427

673

428

def need_approval(self):

674

429

self.last_approval_request = datetime.datetime.utcnow()

679

434

If a checker already exists, leave it running and do

680

435

nothing."""

681

436

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

682

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

683

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

684

# would inevitably timeout, since no checker would get a

685

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

437

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

438

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

439

# client would inevitably timeout, since no checker would get

440

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

686

441

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

687

442

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

688

443

# should be.

690

445

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

691

446

try:

692

447

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

693

except AttributeError:

694

pass

695

except OSError as error:

696

if error.errno != errno.ECHILD:

697

raise

448

except (AttributeError, OSError), error:

449

if (isinstance(error, OSError)

450

and error.errno != errno.ECHILD):

451

raise error

698

452

else:

699

453

if pid:

700

454

logger.warning("Checker was a zombie")

703

457

self.current_checker_command)

704

458

# Start a new checker if needed

705

459

if self.checker is None:

706

# Escape attributes for the shell

707

escaped_attrs = {

708

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

709

for attr in self.runtime_expansions }

710

460

try:

711

command = self.checker_command % escaped_attrs

712

except TypeError as error:

713

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

714

self.checker_command,

715

exc_info=error)

716

return True # Try again later

461

# In case checker_command has exactly one % operator

462

command = self.checker_command % self.host

463

except TypeError:

464

# Escape attributes for the shell

465

escaped_attrs = dict(

466

(attr,

467

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

468

errors=

469

'replace')))

470

for attr in

471

self.runtime_expansions)

472

473

try:

474

command = self.checker_command % escaped_attrs

475

except TypeError, error:

476

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

477

' %s', self.checker_command, error)

478

return True # Try again later

717

479

self.current_checker_command = command

718

480

try:

719

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

720

self.name)

481

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

482

command, self.name)

721

483

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

722

484

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

723

485

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

724

486

# always replaced by /dev/null.)

725

# The exception is when not debugging but nevertheless

726

# running in the foreground; use the previously

727

# created wnull.

728

popen_args = {}

729

if (not self.server_settings["debug"]

730

and self.server_settings["foreground"]):

731

popen_args.update({"stdout": wnull,

732

"stderr": wnull })

733

487

self.checker = subprocess.Popen(command,

734

488

close_fds=True,

735

shell=True,

736

cwd="/",

737

**popen_args)

738

except OSError as error:

739

logger.error("Failed to start subprocess",

740

exc_info=error)

741

return True

742

self.checker_callback_tag = gobject.child_watch_add(

743

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

744

# The checker may have completed before the gobject

745

# watch was added. Check for this.

746

try:

489

shell=True, cwd="/")

490

self.checker_callback_tag = (gobject.child_watch_add

491

(self.checker.pid,

492

self.checker_callback,

493

data=command))

494

# The checker may have completed before the gobject

495

# watch was added. Check for this.

747

496

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

748

except OSError as error:

749

if error.errno == errno.ECHILD:

750

# This should never happen

751

logger.error("Child process vanished",

752

exc_info=error)

753

return True

754

raise

755

if pid:

756

gobject.source_remove(self.checker_callback_tag)

757

self.checker_callback(pid, status, command)

497

if pid:

498

gobject.source_remove(self.checker_callback_tag)

499

self.checker_callback(pid, status, command)

500

except OSError, error:

501

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

502

error)

758

503

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

759

504

return True

760

505

767

512

return

768

513

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

769

514

try:

770

self.checker.terminate()

515

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

771

516

#time.sleep(0.5)

772

517

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

773

# self.checker.kill()

774

except OSError as error:

518

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

519

except OSError, error:

775

520

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

776

521

raise

777

522

self.checker = None

778

523

779

780

def dbus_service_property(dbus_interface,

781

signature="v",

782

access="readwrite",

783

byte_arrays=False):

524

def dbus_service_property(dbus_interface, signature="v",

525

access="readwrite", byte_arrays=False):

784

526

"""Decorators for marking methods of a DBusObjectWithProperties to

785

527

become properties on the D-Bus.

786

528

795

537

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

796

538

if byte_arrays and signature != "ay":

797

539

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

798

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

799

540

" signature %r" % signature)

800

541

def decorator(func):

801

542

func._dbus_is_property = True

802

543

func._dbus_interface = dbus_interface

807

548

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

808

549

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

809

550

return func

810

811

return decorator

812

813

814

def dbus_interface_annotations(dbus_interface):

815

"""Decorator for marking functions returning interface annotations

816

817

Usage:

818

819

@dbus_interface_annotations("org.example.Interface")

820

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

821

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

822

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

823

"false"}

824

"""

825

826

def decorator(func):

827

func._dbus_is_interface = True

828

func._dbus_interface = dbus_interface

829

func._dbus_name = dbus_interface

830

return func

831

832

return decorator

833

834

835

def dbus_annotations(annotations):

836

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

837

Usage:

838

839

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

840

"org.freedesktop.DBus.Property."

841

"EmitsChangedSignal": "false"})

842

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

843

access="r")

844

def Property_dbus_property(self):

845

return dbus.Boolean(False)

846

"""

847

848

def decorator(func):

849

func._dbus_annotations = annotations

850

return func

851

852

551

return decorator

853

552

854

553

855

554

class DBusPropertyException(dbus.exceptions.DBusException):

856

555

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

857

556

"""

858

pass

557

def __unicode__(self):

558

return unicode(str(self))

859

559

860

560

861

561

class DBusPropertyAccessException(DBusPropertyException):

872

572

873

573

class DBusObjectWithProperties(dbus.service.Object):

874

574

"""A D-Bus object with properties.

875

575

876

576

Classes inheriting from this can use the dbus_service_property

877

577

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

878

578

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

879

579

"""

880

580

881

581

@staticmethod

882

def _is_dbus_thing(thing):

883

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

884

885

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

886

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

887

"""

888

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

889

False)

582

def _is_dbus_property(obj):

583

return getattr(obj, "_dbus_is_property", False)

890

584

891

def _get_all_dbus_things(self, thing):

585

def _get_all_dbus_properties(self):

892

586

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

893

587

"""

894

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

895

athing.__get__(self))

896

for cls in self.__class__.__mro__

897

for name, athing in

898

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

588

return ((prop._dbus_name, prop)

589

for name, prop in

590

inspect.getmembers(self, self._is_dbus_property))

899

591

900

592

def _get_dbus_property(self, interface_name, property_name):

901

593

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

902

594

property with the specified name and interface.

903

595

"""

904

for cls in self.__class__.__mro__:

905

for name, value in inspect.getmembers(

906

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

907

if (value._dbus_name == property_name

908

and value._dbus_interface == interface_name):

909

return value.__get__(self)

910

596

for name in (property_name,

597

property_name + "_dbus_property"):

598

prop = getattr(self, name, None)

599

if (prop is None

600

or not self._is_dbus_property(prop)

601

or prop._dbus_name != property_name

602

or (interface_name and prop._dbus_interface

603

and interface_name != prop._dbus_interface)):

604

continue

605

return prop

911

606

# No such property

912

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

913

self.dbus_object_path, interface_name, property_name))

607

raise DBusPropertyNotFound(self.dbus_object_path + ":"

608

+ interface_name + "."

609

+ property_name)

914

610

915

@dbus.service.method(dbus.PROPERTIES_IFACE,

916

in_signature="ss",

611

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

917

612

out_signature="v")

918

613

def Get(self, interface_name, property_name):

919

614

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

937

632

# The byte_arrays option is not supported yet on

938

633

# signatures other than "ay".

939

634

if prop._dbus_signature != "ay":

940

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

941

"'ay' signature {!r}"

942

.format(prop._dbus_signature))

943

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

944

for byte in value))

635

raise ValueError

636

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

637

for byte in value))

945

638

prop(value)

946

639

947

@dbus.service.method(dbus.PROPERTIES_IFACE,

948

in_signature="s",

640

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

949

641

out_signature="a{sv}")

950

642

def GetAll(self, interface_name):

951

643

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

952

644

standard.

953

645

954

646

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

955

647

"""

956

properties = {}

957

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

648

all = {}

649

for name, prop in self._get_all_dbus_properties():

958

650

if (interface_name

959

651

and interface_name != prop._dbus_interface):

960

652

# Interface non-empty but did not match

964

656

continue

965

657

value = prop()

966

658

if not hasattr(value, "variant_level"):

967

properties[name] = value

659

all[name] = value

968

660

continue

969

properties[name] = type(value)(

970

value, variant_level = value.variant_level + 1)

971

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

972

973

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

974

def PropertiesChanged(self, interface_name, changed_properties,

975

invalidated_properties):

976

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

977

standard.

978

"""

979

pass

661

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

662

value.variant_level+1)

663

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

980

664

981

665

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

982

666

out_signature="s",

983

667

path_keyword='object_path',

984

668

connection_keyword='connection')

985

669

def Introspect(self, object_path, connection):

986

"""Overloading of standard D-Bus method.

987

988

Inserts property tags and interface annotation tags.

670

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

989

671

"""

990

672

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

991

673

connection)

992

674

try:

993

675

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

994

995

676

def make_tag(document, name, prop):

996

677

e = document.createElement("property")

997

678

e.setAttribute("name", name)

998

679

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

999

680

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

1000

681

return e

1001

1002

682

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

1003

# Add property tags

1004

683

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

1005

684

for name, prop

1006

in self._get_all_dbus_things("property")

685

in self._get_all_dbus_properties()

1007

686

if prop._dbus_interface

1008

687

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

1009

688

if_tag.appendChild(tag)

1010

# Add annotation tags

1011

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

1012

for tag in if_tag.getElementsByTagName(typ):

1013

annots = dict()

1014

for name, prop in (self.

1015

_get_all_dbus_things(typ)):

1016

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

1017

and prop._dbus_interface

1018

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

1019

annots.update(getattr(

1020

prop, "_dbus_annotations", {}))

1021

for name, value in annots.items():

1022

ann_tag = document.createElement(

1023

"annotation")

1024

ann_tag.setAttribute("name", name)

1025

ann_tag.setAttribute("value", value)

1026

tag.appendChild(ann_tag)

1027

# Add interface annotation tags

1028

for annotation, value in dict(

1029

itertools.chain.from_iterable(

1030

annotations().items()

1031

for name, annotations

1032

in self._get_all_dbus_things("interface")

1033

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

1034

)).items():

1035

ann_tag = document.createElement("annotation")

1036

ann_tag.setAttribute("name", annotation)

1037

ann_tag.setAttribute("value", value)

1038

if_tag.appendChild(ann_tag)

1039

689

# Add the names to the return values for the

1040

690

# "org.freedesktop.DBus.Properties" methods

1041

691

if (if_tag.getAttribute("name")

1054

704

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

1055

705

document.unlink()

1056

706

except (AttributeError, xml.dom.DOMException,

1057

xml.parsers.expat.ExpatError) as error:

707

xml.parsers.expat.ExpatError), error:

1058

708

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

1059

exc_info=error)

709

error)

1060

710

return xmlstring

1061

711

1062

712

1063

def datetime_to_dbus(dt, variant_level=0):

1064

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

1065

if dt is None:

1066

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

1067

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

1068

1069

1070

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1071

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

1072

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

1073

interface names according to the "alt_interface_names" mapping.

1074

Usage:

1075

1076

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

1077

"net.example.AlternateInterface"})

1078

class SampleDBusObject(dbus.service.Object):

1079

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

1080

def SampleDBusMethod():

1081

pass

1082

1083

The above "SampleDBusMethod" on "SampleDBusObject" will be

1084

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

1085

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

1086

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

1087

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

1088

1089

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

1090

(from DBusObjectWithProperties) and interfaces (from the

1091

dbus_interface_annotations decorator).

1092

"""

1093

1094

def wrapper(cls):

1095

for orig_interface_name, alt_interface_name in (

1096

alt_interface_names.items()):

1097

attr = {}

1098

interface_names = set()

1099

# Go though all attributes of the class

1100

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

1101

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

1102

# with the wrong interface name

1103

if (not hasattr(attribute, "_dbus_interface")

1104

or not attribute._dbus_interface.startswith(

1105

orig_interface_name)):

1106

continue

1107

# Create an alternate D-Bus interface name based on

1108

# the current name

1109

alt_interface = attribute._dbus_interface.replace(

1110

orig_interface_name, alt_interface_name)

1111

interface_names.add(alt_interface)

1112

# Is this a D-Bus signal?

1113

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

1114

if sys.version == 2:

1115

# Extract the original non-method undecorated

1116

# function by black magic

1117

nonmethod_func = (dict(

1118

zip(attribute.func_code.co_freevars,

1119

attribute.__closure__))

1120

["func"].cell_contents)

1121

else:

1122

nonmethod_func = attribute

1123

# Create a new, but exactly alike, function

1124

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

1125

# with the alternate D-Bus interface name

1126

if sys.version == 2:

1127

new_function = types.FunctionType(

1128

nonmethod_func.func_code,

1129

nonmethod_func.func_globals,

1130

nonmethod_func.func_name,

1131

nonmethod_func.func_defaults,

1132

nonmethod_func.func_closure)

1133

else:

1134

new_function = types.FunctionType(

1135

nonmethod_func.__code__,

1136

nonmethod_func.__globals__,

1137

nonmethod_func.__name__,

1138

nonmethod_func.__defaults__,

1139

nonmethod_func.__closure__)

1140

new_function = (dbus.service.signal(

1141

alt_interface,

1142

attribute._dbus_signature)(new_function))

1143

# Copy annotations, if any

1144

try:

1145

new_function._dbus_annotations = dict(

1146

attribute._dbus_annotations)

1147

except AttributeError:

1148

pass

1149

# Define a creator of a function to call both the

1150

# original and alternate functions, so both the

1151

# original and alternate signals gets sent when

1152

# the function is called

1153

def fixscope(func1, func2):

1154

"""This function is a scope container to pass

1155

func1 and func2 to the "call_both" function

1156

outside of its arguments"""

1157

1158

def call_both(*args, **kwargs):

1159

"""This function will emit two D-Bus

1160

signals by calling func1 and func2"""

1161

func1(*args, **kwargs)

1162

func2(*args, **kwargs)

1163

1164

return call_both

1165

# Create the "call_both" function and add it to

1166

# the class

1167

attr[attrname] = fixscope(attribute, new_function)

1168

# Is this a D-Bus method?

1169

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

1170

# Create a new, but exactly alike, function

1171

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

1172

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

1173

# to the class.

1174

attr[attrname] = (

1175

dbus.service.method(

1176

alt_interface,

1177

attribute._dbus_in_signature,

1178

attribute._dbus_out_signature)

1179

(types.FunctionType(attribute.func_code,

1180

attribute.func_globals,

1181

attribute.func_name,

1182

attribute.func_defaults,

1183

attribute.func_closure)))

1184

# Copy annotations, if any

1185

try:

1186

attr[attrname]._dbus_annotations = dict(

1187

attribute._dbus_annotations)

1188

except AttributeError:

1189

pass

1190

# Is this a D-Bus property?

1191

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

1192

# Create a new, but exactly alike, function

1193

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

1194

# property with the alternate D-Bus interface

1195

# name. Add it to the class.

1196

attr[attrname] = (dbus_service_property(

1197

alt_interface, attribute._dbus_signature,

1198

attribute._dbus_access,

1199

attribute._dbus_get_args_options

1200

["byte_arrays"])

1201

(types.FunctionType(

1202

attribute.func_code,

1203

attribute.func_globals,

1204

attribute.func_name,

1205

attribute.func_defaults,

1206

attribute.func_closure)))

1207

# Copy annotations, if any

1208

try:

1209

attr[attrname]._dbus_annotations = dict(

1210

attribute._dbus_annotations)

1211

except AttributeError:

1212

pass

1213

# Is this a D-Bus interface?

1214

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

1215

# Create a new, but exactly alike, function

1216

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

1217

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

1218

# to the class.

1219

attr[attrname] = (

1220

dbus_interface_annotations(alt_interface)

1221

(types.FunctionType(attribute.func_code,

1222

attribute.func_globals,

1223

attribute.func_name,

1224

attribute.func_defaults,

1225

attribute.func_closure)))

1226

if deprecate:

1227

# Deprecate all alternate interfaces

1228

iname="_AlternateDBusNames_interface_annotation{}"

1229

for interface_name in interface_names:

1230

1231

@dbus_interface_annotations(interface_name)

1232

def func(self):

1233

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

1234

"true" }

1235

# Find an unused name

1236

for aname in (iname.format(i)

1237

for i in itertools.count()):

1238

if aname not in attr:

1239

attr[aname] = func

1240

break

1241

if interface_names:

1242

# Replace the class with a new subclass of it with

1243

# methods, signals, etc. as created above.

1244

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

1245

(cls, ), attr)

1246

return cls

1247

1248

return wrapper

1249

1250

1251

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

1252

"se.bsnet.fukt.Mandos"})

1253

713

class ClientDBus(Client, DBusObjectWithProperties):

1254

714

"""A Client class using D-Bus

1255

715

1259

719

"""

1260

720

1261

721

runtime_expansions = (Client.runtime_expansions

1262

+ ("dbus_object_path", ))

1263

1264

_interface = "se.recompile.Mandos.Client"

722

+ ("dbus_object_path",))

1265

723

1266

724

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

1267

725

1268

726

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

727

self._approvals_pending = 0

1269

728

self.bus = bus

1270

729

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

1271

730

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

1272

731

# the D-Bus

1273

client_object_name = str(self.name).translate(

732

client_object_name = unicode(self.name).translate(

1274

733

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

1275

734

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

1276

self.dbus_object_path = dbus.ObjectPath(

1277

"/clients/" + client_object_name)

735

self.dbus_object_path = (dbus.ObjectPath

736

("/clients/" + client_object_name))

1278

737

DBusObjectWithProperties.__init__(self, self.bus,

1279

738

self.dbus_object_path)

1280

1281

def notifychangeproperty(transform_func, dbus_name,

1282

type_func=lambda x: x,

1283

variant_level=1,

1284

invalidate_only=False,

1285

_interface=_interface):

1286

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

1287

its changes to DBus.

1288

1289

transform_fun: Function that takes a value and a variant_level

1290

and transforms it to a D-Bus type.

1291

dbus_name: D-Bus name of the variable

1292

type_func: Function that transform the value before sending it

1293

to the D-Bus. Default: no transform

1294

variant_level: D-Bus variant level. Default: 1

1295

"""

1296

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

1297

1298

def setter(self, value):

1299

if hasattr(self, "dbus_object_path"):

1300

if (not hasattr(self, attrname) or

1301

type_func(getattr(self, attrname, None))

1302

!= type_func(value)):

1303

if invalidate_only:

1304

self.PropertiesChanged(

1305

_interface, dbus.Dictionary(),

1306

dbus.Array((dbus_name, )))

1307

else:

1308

dbus_value = transform_func(

1309

type_func(value),

1310

variant_level = variant_level)

1311

self.PropertyChanged(dbus.String(dbus_name),

1312

dbus_value)

1313

self.PropertiesChanged(

1314

_interface,

1315

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

1316

dbus_value }),

1317

dbus.Array())

1318

setattr(self, attrname, value)

1319

1320

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

1321

1322

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1323

approvals_pending = notifychangeproperty(dbus.Boolean,

1324

"ApprovalPending",

1325

type_func = bool)

1326

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

1327

last_enabled = notifychangeproperty(datetime_to_dbus,

1328

"LastEnabled")

1329

checker = notifychangeproperty(

1330

dbus.Boolean, "CheckerRunning",

1331

type_func = lambda checker: checker is not None)

1332

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1333

"LastCheckedOK")

1334

last_checker_status = notifychangeproperty(dbus.Int16,

1335

"LastCheckerStatus")

1336

last_approval_request = notifychangeproperty(

1337

datetime_to_dbus, "LastApprovalRequest")

1338

approved_by_default = notifychangeproperty(dbus.Boolean,

1339

"ApprovedByDefault")

1340

approval_delay = notifychangeproperty(

1341

dbus.UInt64, "ApprovalDelay",

1342

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

1343

approval_duration = notifychangeproperty(

1344

dbus.UInt64, "ApprovalDuration",

1345

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

1346

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

1347

timeout = notifychangeproperty(

1348

dbus.UInt64, "Timeout",

1349

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

1350

extended_timeout = notifychangeproperty(

1351

dbus.UInt64, "ExtendedTimeout",

1352

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

1353

interval = notifychangeproperty(

1354

dbus.UInt64, "Interval",

1355

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

1356

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

1357

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

1358

invalidate_only=True)

1359

1360

del notifychangeproperty

739

740

def _get_approvals_pending(self):

741

return self._approvals_pending

742

def _set_approvals_pending(self, value):

743

old_value = self._approvals_pending

744

self._approvals_pending = value

745

bval = bool(value)

746

if (hasattr(self, "dbus_object_path")

747

and bval is not bool(old_value)):

748

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

749

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

750

dbus_bool)

751

752

approvals_pending = property(_get_approvals_pending,

753

_set_approvals_pending)

754

del _get_approvals_pending, _set_approvals_pending

755

756

@staticmethod

757

def _datetime_to_dbus(dt, variant_level=0):

758

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

759

return dbus.String(dt.isoformat(),

760

variant_level=variant_level)

761

762

def enable(self):

763

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

764

r = Client.enable(self)

765

if oldstate != self.enabled:

766

# Emit D-Bus signals

767

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

768

dbus.Boolean(True, variant_level=1))

769

self.PropertyChanged(

770

dbus.String("LastEnabled"),

771

self._datetime_to_dbus(self.last_enabled,

772

variant_level=1))

773

return r

774

775

def disable(self, quiet = False):

776

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

777

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

778

if not quiet and oldstate != self.enabled:

779

# Emit D-Bus signal

780

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

781

dbus.Boolean(False, variant_level=1))

782

return r

1361

783

1362

784

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

1363

785

try:

1372

794

*args, **kwargs):

1373

795

self.checker_callback_tag = None

1374

796

self.checker = None

797

# Emit D-Bus signal

798

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

799

dbus.Boolean(False, variant_level=1))

1375

800

if os.WIFEXITED(condition):

1376

801

exitstatus = os.WEXITSTATUS(condition)

1377

802

# Emit D-Bus signal

1387

812

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

1388

813

*args, **kwargs)

1389

814

815

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

816

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

817

# Emit D-Bus signal

818

self.PropertyChanged(

819

dbus.String("LastCheckedOK"),

820

(self._datetime_to_dbus(self.last_checked_ok,

821

variant_level=1)))

822

return r

823

824

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

825

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

826

# Emit D-Bus signal

827

self.PropertyChanged(

828

dbus.String("LastApprovalRequest"),

829

(self._datetime_to_dbus(self.last_approval_request,

830

variant_level=1)))

831

return r

832

1390

833

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

1391

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

834

old_checker = self.checker

835

if self.checker is not None:

836

old_checker_pid = self.checker.pid

837

else:

838

old_checker_pid = None

1392

839

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

1393

840

# Only if new checker process was started

1394

841

if (self.checker is not None

1395

842

and old_checker_pid != self.checker.pid):

1396

843

# Emit D-Bus signal

1397

844

self.CheckerStarted(self.current_checker_command)

845

self.PropertyChanged(

846

dbus.String("CheckerRunning"),

847

dbus.Boolean(True, variant_level=1))

1398

848

return r

1399

849

850

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

851

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

852

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

853

if (old_checker is not None

854

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

855

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

856

dbus.Boolean(False, variant_level=1))

857

return r

858

1400

859

def _reset_approved(self):

1401

self.approved = None

860

self._approved = None

1402

861

return False

1403

862

1404

863

def approve(self, value=True):

1405

self.approved = value

1406

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

1407

* 1000), self._reset_approved)

1408

864

self.send_changedstate()

865

self._approved = value

866

gobject.timeout_add(self._timedelta_to_milliseconds

867

(self.approval_duration),

868

self._reset_approved)

869

1409

870

1410

871

## D-Bus methods, signals & properties

1411

1412

## Interfaces

872

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

1413

873

1414

874

## Signals

1415

875

1426

886

pass

1427

887

1428

888

# PropertyChanged - signal

1429

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

1430

889

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

1431

890

def PropertyChanged(self, property, value):

1432

891

"D-Bus signal"

1463

922

# CheckedOK - method

1464

923

@dbus.service.method(_interface)

1465

924

def CheckedOK(self):

1466

self.checked_ok()

925

return self.checked_ok()

1467

926

1468

927

# Enable - method

1469

928

@dbus.service.method(_interface)

1496

955

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

1497

956

1498

957

# ApprovedByDefault - property

1499

@dbus_service_property(_interface,

1500

signature="b",

958

@dbus_service_property(_interface, signature="b",

1501

959

access="readwrite")

1502

960

def ApprovedByDefault_dbus_property(self, value=None):

1503

961

if value is None: # get

1504

962

return dbus.Boolean(self.approved_by_default)

1505

963

self.approved_by_default = bool(value)

964

# Emit D-Bus signal

965

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

966

dbus.Boolean(value, variant_level=1))

1506

967

1507

968

# ApprovalDelay - property

1508

@dbus_service_property(_interface,

1509

signature="t",

969

@dbus_service_property(_interface, signature="t",

1510

970

access="readwrite")

1511

971

def ApprovalDelay_dbus_property(self, value=None):

1512

972

if value is None: # get

1513

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

1514

* 1000)

973

return dbus.UInt64(self.approval_delay_milliseconds())

1515

974

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

975

# Emit D-Bus signal

976

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

977

dbus.UInt64(value, variant_level=1))

1516

978

1517

979

# ApprovalDuration - property

1518

@dbus_service_property(_interface,

1519

signature="t",

980

@dbus_service_property(_interface, signature="t",

1520

981

access="readwrite")

1521

982

def ApprovalDuration_dbus_property(self, value=None):

1522

983

if value is None: # get

1523

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

1524

* 1000)

984

return dbus.UInt64(self._timedelta_to_milliseconds(

985

self.approval_duration))

1525

986

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

987

# Emit D-Bus signal

988

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

989

dbus.UInt64(value, variant_level=1))

1526

990

1527

991

# Name - property

1528

992

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

1535

999

return dbus.String(self.fingerprint)

1536

1000

1537

1001

# Host - property

1538

@dbus_service_property(_interface,

1539

signature="s",

1002

@dbus_service_property(_interface, signature="s",

1540

1003

access="readwrite")

1541

1004

def Host_dbus_property(self, value=None):

1542

1005

if value is None: # get

1543

1006

return dbus.String(self.host)

1544

self.host = str(value)

1007

self.host = value

1008

# Emit D-Bus signal

1009

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

1010

dbus.String(value, variant_level=1))

1545

1011

1546

1012

# Created - property

1547

1013

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

1548

1014

def Created_dbus_property(self):

1549

return datetime_to_dbus(self.created)

1015

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

1550

1016

1551

1017

# LastEnabled - property

1552

1018

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

1553

1019

def LastEnabled_dbus_property(self):

1554

return datetime_to_dbus(self.last_enabled)

1020

if self.last_enabled is None:

1021

return dbus.String("")

1022

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

1555

1023

1556

1024

# Enabled - property

1557

@dbus_service_property(_interface,

1558

signature="b",

1025

@dbus_service_property(_interface, signature="b",

1559

1026

access="readwrite")

1560

1027

def Enabled_dbus_property(self, value=None):

1561

1028

if value is None: # get

1566

1033

self.disable()

1567

1034

1568

1035

# LastCheckedOK - property

1569

@dbus_service_property(_interface,

1570

signature="s",

1036

@dbus_service_property(_interface, signature="s",

1571

1037

access="readwrite")

1572

1038

def LastCheckedOK_dbus_property(self, value=None):

1573

1039

if value is not None:

1574

1040

self.checked_ok()

1575

1041

return

1576

return datetime_to_dbus(self.last_checked_ok)

1577

1578

# LastCheckerStatus - property

1579

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

1580

def LastCheckerStatus_dbus_property(self):

1581

return dbus.Int16(self.last_checker_status)

1582

1583

# Expires - property

1584

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

1585

def Expires_dbus_property(self):

1586

return datetime_to_dbus(self.expires)

1042

if self.last_checked_ok is None:

1043

return dbus.String("")

1044

return dbus.String(self._datetime_to_dbus(self

1045

.last_checked_ok))

1587

1046

1588

1047

# LastApprovalRequest - property

1589

1048

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

1590

1049

def LastApprovalRequest_dbus_property(self):

1591

return datetime_to_dbus(self.last_approval_request)

1050

if self.last_approval_request is None:

1051

return dbus.String("")

1052

return dbus.String(self.

1053

_datetime_to_dbus(self

1054

.last_approval_request))

1592

1055

1593

1056

# Timeout - property

1594

@dbus_service_property(_interface,

1595

signature="t",

1057

@dbus_service_property(_interface, signature="t",

1596

1058

access="readwrite")

1597

1059

def Timeout_dbus_property(self, value=None):

1598

1060

if value is None: # get

1599

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

1600

old_timeout = self.timeout

1061

return dbus.UInt64(self.timeout_milliseconds())

1601

1062

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

1602

# Reschedule disabling

1603

if self.enabled:

1604

now = datetime.datetime.utcnow()

1605

self.expires += self.timeout - old_timeout

1606

if self.expires <= now:

1607

# The timeout has passed

1608

self.disable()

1609

else:

1610

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

1611

is None):

1612

return

1613

gobject.source_remove(self.disable_initiator_tag)

1614

self.disable_initiator_tag = gobject.timeout_add(

1615

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

1616

self.disable)

1617

1618

# ExtendedTimeout - property

1619

@dbus_service_property(_interface,

1620

signature="t",

1621

access="readwrite")

1622

def ExtendedTimeout_dbus_property(self, value=None):

1623

if value is None: # get

1624

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

1625

* 1000)

1626

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

1063

# Emit D-Bus signal

1064

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

1065

dbus.UInt64(value, variant_level=1))

1066

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

1067

return

1068

# Reschedule timeout

1069

gobject.source_remove(self.disable_initiator_tag)

1070

self.disable_initiator_tag = None

1071

time_to_die = (self.

1072

_timedelta_to_milliseconds((self

1073

.last_checked_ok

1074

+ self.timeout)

1075

- datetime.datetime

1076

.utcnow()))

1077

if time_to_die <= 0:

1078

# The timeout has passed

1079

self.disable()

1080

else:

1081

self.disable_initiator_tag = (gobject.timeout_add

1082

(time_to_die, self.disable))

1627

1083

1628

1084

# Interval - property

1629

@dbus_service_property(_interface,

1630

signature="t",

1085

@dbus_service_property(_interface, signature="t",

1631

1086

access="readwrite")

1632

1087

def Interval_dbus_property(self, value=None):

1633

1088

if value is None: # get

1634

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

1089

return dbus.UInt64(self.interval_milliseconds())

1635

1090

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

1091

# Emit D-Bus signal

1092

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

1093

dbus.UInt64(value, variant_level=1))

1636

1094

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

1637

1095

return

1638

if self.enabled:

1639

# Reschedule checker run

1640

gobject.source_remove(self.checker_initiator_tag)

1641

self.checker_initiator_tag = gobject.timeout_add(

1642

value, self.start_checker)

1643

self.start_checker() # Start one now, too

1644

1096

# Reschedule checker run

1097

gobject.source_remove(self.checker_initiator_tag)

1098

self.checker_initiator_tag = (gobject.timeout_add

1099

(value, self.start_checker))

1100

self.start_checker() # Start one now, too

1101

1645

1102

# Checker - property

1646

@dbus_service_property(_interface,

1647

signature="s",

1103

@dbus_service_property(_interface, signature="s",

1648

1104

access="readwrite")

1649

1105

def Checker_dbus_property(self, value=None):

1650

1106

if value is None: # get

1651

1107

return dbus.String(self.checker_command)

1652

self.checker_command = str(value)

1108

self.checker_command = value

1109

# Emit D-Bus signal

1110

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

1111

dbus.String(self.checker_command,

1112

variant_level=1))

1653

1113

1654

1114

# CheckerRunning - property

1655

@dbus_service_property(_interface,

1656

signature="b",

1115

@dbus_service_property(_interface, signature="b",

1657

1116

access="readwrite")

1658

1117

def CheckerRunning_dbus_property(self, value=None):

1659

1118

if value is None: # get

1669

1128

return self.dbus_object_path # is already a dbus.ObjectPath

1670

1129

1671

1130

# Secret = property

1672

@dbus_service_property(_interface,

1673

signature="ay",

1674

access="write",

1675

byte_arrays=True)

1131

@dbus_service_property(_interface, signature="ay",

1132

access="write", byte_arrays=True)

1676

1133

def Secret_dbus_property(self, value):

1677

self.secret = bytes(value)

1134

self.secret = str(value)

1678

1135

1679

1136

del _interface

1680

1137

1684

1141

self._pipe = child_pipe

1685

1142

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

1686

1143

if not self._pipe.recv():

1687

raise KeyError(fpr)

1688

1144

raise KeyError()

1145

1689

1146

def __getattribute__(self, name):

1690

if name == '_pipe':

1147

if(name == '_pipe'):

1691

1148

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

1692

1149

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

1693

1150

data = self._pipe.recv()

1694

1151

if data[0] == 'data':

1695

1152

return data[1]

1696

1153

if data[0] == 'function':

1697

1698

1154

def func(*args, **kwargs):

1699

1155

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

1700

1156

return self._pipe.recv()[1]

1701

1702

1157

return func

1703

1158

1704

1159

def __setattr__(self, name, value):

1705

if name == '_pipe':

1160

if(name == '_pipe'):

1706

1161

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

1707

1162

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

1708

1163

1716

1171

def handle(self):

1717

1172

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

1718

1173

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

1719

str(self.client_address))

1174

unicode(self.client_address))

1720

1175

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

1721

1176

self.server.child_pipe.fileno())

1722

1723

session = gnutls.connection.ClientSession(

1724

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

1725

1177

1178

session = (gnutls.connection

1179

.ClientSession(self.request,

1180

gnutls.connection

1181

.X509Credentials()))

1182

1726

1183

# Note: gnutls.connection.X509Credentials is really a

1727

1184

# generic GnuTLS certificate credentials object so long as

1728

1185

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

1729

1186

# here despite using OpenPGP certificates.

1730

1187

1731

1188

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

1732

1189

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

1733

1190

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

1736

1193

priority = self.server.gnutls_priority

1737

1194

if priority is None:

1738

1195

priority = "NORMAL"

1739

gnutls.library.functions.gnutls_priority_set_direct(

1740

session._c_object, priority, None)

1741

1196

(gnutls.library.functions

1197

.gnutls_priority_set_direct(session._c_object,

1198

priority, None))

1199

1742

1200

# Start communication using the Mandos protocol

1743

1201

# Get protocol number

1744

1202

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

1745

1203

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

1746

1204

try:

1747

1205

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

1748

raise RuntimeError(line)

1749

except (ValueError, IndexError, RuntimeError) as error:

1206

raise RuntimeError

1207

except (ValueError, IndexError, RuntimeError), error:

1750

1208

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

1751

1209

return

1752

1210

1753

1211

# Start GnuTLS connection

1754

1212

try:

1755

1213

session.handshake()

1756

except gnutls.errors.GNUTLSError as error:

1214

except gnutls.errors.GNUTLSError, error:

1757

1215

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

1758

1216

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

1759

1217

# established. Just abandon the request.

1760

1218

return

1761

1219

logger.debug("Handshake succeeded")

1762

1220

1763

1221

approval_required = False

1764

1222

try:

1765

1223

try:

1766

fpr = self.fingerprint(

1767

self.peer_certificate(session))

1768

except (TypeError,

1769

gnutls.errors.GNUTLSError) as error:

1224

fpr = self.fingerprint(self.peer_certificate

1225

(session))

1226

except (TypeError, gnutls.errors.GNUTLSError), error:

1770

1227

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

1771

1228

return

1772

1229

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

1773

1230

1774

1231

try:

1775

1232

client = ProxyClient(child_pipe, fpr,

1776

1233

self.client_address)

1784

1241

1785

1242

while True:

1786

1243

if not client.enabled:

1787

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

1788

client.name)

1244

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

1245

client.name)

1789

1246

if self.server.use_dbus:

1790

1247

# Emit D-Bus signal

1791

client.Rejected("Disabled")

1248

client.Rejected("Disabled")

1792

1249

return

1793

1250

1794

if client.approved or not client.approval_delay:

1251

if client._approved or not client.approval_delay:

1795

1252

#We are approved or approval is disabled

1796

1253

break

1797

elif client.approved is None:

1254

elif client._approved is None:

1798

1255

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

1799

1256

client.name)

1800

1257

if self.server.use_dbus:

1801

1258

# Emit D-Bus signal

1802

1259

client.NeedApproval(

1803

client.approval_delay.total_seconds()

1804

* 1000, client.approved_by_default)

1260

client.approval_delay_milliseconds(),

1261

client.approved_by_default)

1805

1262

else:

1806

1263

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

1807

1264

client.name)

1811

1268

return

1812

1269

1813

1270

#wait until timeout or approved

1271

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

1814

1272

time = datetime.datetime.now()

1815

1273

client.changedstate.acquire()

1816

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

1274

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

1817

1275

client.changedstate.release()

1818

1276

time2 = datetime.datetime.now()

1819

1277

if (time2 - time) >= delay:

1834

1292

while sent_size < len(client.secret):

1835

1293

try:

1836

1294

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

1837

except gnutls.errors.GNUTLSError as error:

1838

logger.warning("gnutls send failed",

1839

exc_info=error)

1295

except (gnutls.errors.GNUTLSError), error:

1296

logger.warning("gnutls send failed")

1840

1297

return

1841

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

1842

len(client.secret) - (sent_size

1843

+ sent))

1298

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

1299

sent, len(client.secret)

1300

- (sent_size + sent))

1844

1301

sent_size += sent

1845

1302

1846

1303

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

1847

# bump the timeout using extended_timeout

1848

client.bump_timeout(client.extended_timeout)

1304

# bump the timeout as if seen

1305

client.checked_ok()

1849

1306

if self.server.use_dbus:

1850

1307

# Emit D-Bus signal

1851

1308

client.GotSecret()

1855

1312

client.approvals_pending -= 1

1856

1313

try:

1857

1314

session.bye()

1858

except gnutls.errors.GNUTLSError as error:

1859

logger.warning("GnuTLS bye failed",

1860

exc_info=error)

1315

except (gnutls.errors.GNUTLSError), error:

1316

logger.warning("GnuTLS bye failed")

1861

1317

1862

1318

@staticmethod

1863

1319

def peer_certificate(session):

1864

1320

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

1865

1321

# If not an OpenPGP certificate...

1866

if (gnutls.library.functions.gnutls_certificate_type_get(

1867

session._c_object)

1322

if (gnutls.library.functions

1323

.gnutls_certificate_type_get(session._c_object)

1868

1324

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

1869

1325

# ...do the normal thing

1870

1326

return session.peer_certificate

1884

1340

def fingerprint(openpgp):

1885

1341

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

1886

1342

# New GnuTLS "datum" with the OpenPGP public key

1887

datum = gnutls.library.types.gnutls_datum_t(

1888

ctypes.cast(ctypes.c_char_p(openpgp),

1889

ctypes.POINTER(ctypes.c_ubyte)),

1890

ctypes.c_uint(len(openpgp)))

1343

datum = (gnutls.library.types

1344

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

1345

ctypes.POINTER

1346

(ctypes.c_ubyte)),

1347

ctypes.c_uint(len(openpgp))))

1891

1348

# New empty GnuTLS certificate

1892

1349

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1893

gnutls.library.functions.gnutls_openpgp_crt_init(

1894

ctypes.byref(crt))

1350

(gnutls.library.functions

1351

.gnutls_openpgp_crt_init(ctypes.byref(crt)))

1895

1352

# Import the OpenPGP public key into the certificate

1896

gnutls.library.functions.gnutls_openpgp_crt_import(

1897

crt, ctypes.byref(datum),

1898

gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)

1353

(gnutls.library.functions

1354

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

1355

gnutls.library.constants

1356

.GNUTLS_OPENPGP_FMT_RAW))

1899

1357

# Verify the self signature in the key

1900

1358

crtverify = ctypes.c_uint()

1901

gnutls.library.functions.gnutls_openpgp_crt_verify_self(

1902

crt, 0, ctypes.byref(crtverify))

1359

(gnutls.library.functions

1360

.gnutls_openpgp_crt_verify_self(crt, 0,

1361

ctypes.byref(crtverify)))

1903

1362

if crtverify.value != 0:

1904

1363

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1905

raise gnutls.errors.CertificateSecurityError(

1906

"Verify failed")

1364

raise (gnutls.errors.CertificateSecurityError

1365

("Verify failed"))

1907

1366

# New buffer for the fingerprint

1908

1367

buf = ctypes.create_string_buffer(20)

1909

1368

buf_len = ctypes.c_size_t()

1910

1369

# Get the fingerprint from the certificate into the buffer

1911

gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint(

1912

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

1370

(gnutls.library.functions

1371

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

1372

ctypes.byref(buf_len)))

1913

1373

# Deinit the certificate

1914

1374

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1915

1375

# Convert the buffer to a Python bytestring

1916

1376

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

1917

1377

# Convert the bytestring to hexadecimal notation

1918

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

1378

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

1919

1379

return hex_fpr

1920

1380

1921

1381

1922

1382

class MultiprocessingMixIn(object):

1923

1383

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

1924

1925

1384

def sub_process_main(self, request, address):

1926

1385

try:

1927

1386

self.finish_request(request, address)

1928

except Exception:

1387

except:

1929

1388

self.handle_error(request, address)

1930

1389

self.close_request(request)

1931

1390

1932

1391

def process_request(self, request, address):

1933

1392

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

1934

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

1935

args = (request, address))

1936

proc.start()

1937

return proc

1938

1393

multiprocessing.Process(target = self.sub_process_main,

1394

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

1939

1395

1940

1396

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1941

1397

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

1942

1943

1398

def process_request(self, request, client_address):

1944

1399

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

1945

1400

1946

1401

This function creates a new pipe in self.pipe

1947

1402

"""

1948

1403

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1949

1950

proc = MultiprocessingMixIn.process_request(self, request,

1951

client_address)

1404

1405

super(MultiprocessingMixInWithPipe,

1406

self).process_request(request, client_address)

1952

1407

self.child_pipe.close()

1953

self.add_pipe(parent_pipe, proc)

1954

1955

def add_pipe(self, parent_pipe, proc):

1408

self.add_pipe(parent_pipe)

1409

1410

def add_pipe(self, parent_pipe):

1956

1411

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

1957

raise NotImplementedError()

1958

1412

raise NotImplementedError

1959

1413

1960

1414

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1961

1415

socketserver.TCPServer, object):

1966

1420

interface: None or a network interface name (string)

1967

1421

use_ipv6: Boolean; to use IPv6 or not

1968

1422

"""

1969

1970

1423

def __init__(self, server_address, RequestHandlerClass,

1971

interface=None,

1972

use_ipv6=True,

1973

socketfd=None):

1974

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

1975

creating a new one with socket.socket().

1976

"""

1424

interface=None, use_ipv6=True):

1977

1425

self.interface = interface

1978

1426

if use_ipv6:

1979

1427

self.address_family = socket.AF_INET6

1980

if socketfd is not None:

1981

# Save the file descriptor

1982

self.socketfd = socketfd

1983

# Save the original socket.socket() function

1984

self.socket_socket = socket.socket

1985

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

1986

#

1987

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

1988

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

1989

# patching socket.socket.)

1990

#

1991

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

1992

@functools.wraps(socket.socket)

1993

def socket_wrapper(*args, **kwargs):

1994

# Restore original function so subsequent calls are

1995

# not affected.

1996

socket.socket = self.socket_socket

1997

del self.socket_socket

1998

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

1999

# saved file descriptor.

2000

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

2001

# Replace socket.socket() function with wrapper

2002

socket.socket = socket_wrapper

2003

# The socketserver.TCPServer.__init__ will call

2004

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

2005

# socket_wrapper(), if socketfd was set.

2006

1428

socketserver.TCPServer.__init__(self, server_address,

2007

1429

RequestHandlerClass)

2008

2009

1430

def server_bind(self):

2010

1431

"""This overrides the normal server_bind() function

2011

1432

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

2017

1438

self.interface)

2018

1439

else:

2019

1440

try:

2020

self.socket.setsockopt(

2021

socket.SOL_SOCKET, SO_BINDTODEVICE,

2022

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

2023

except socket.error as error:

2024

if error.errno == errno.EPERM:

2025

logger.error("No permission to bind to"

2026

" interface %s", self.interface)

2027

elif error.errno == errno.ENOPROTOOPT:

1441

self.socket.setsockopt(socket.SOL_SOCKET,

1442

SO_BINDTODEVICE,

1443

str(self.interface

1444

+ '\0'))

1445

except socket.error, error:

1446

if error[0] == errno.EPERM:

1447

logger.error("No permission to"

1448

" bind to interface %s",

1449

self.interface)

1450

elif error[0] == errno.ENOPROTOOPT:

2028

1451

logger.error("SO_BINDTODEVICE not available;"

2029

1452

" cannot bind to interface %s",

2030

1453

self.interface)

2031

elif error.errno == errno.ENODEV:

2032

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

2033

" cannot bind", self.interface)

2034

1454

else:

2035

1455

raise

2036

1456

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

2039

1459

if self.address_family == socket.AF_INET6:

2040

1460

any_address = "::" # in6addr_any

2041

1461

else:

2042

any_address = "0.0.0.0" # INADDR_ANY

1462

any_address = socket.INADDR_ANY

2043

1463

self.server_address = (any_address,

2044

1464

self.server_address[1])

2045

1465

elif not self.server_address[1]:

2046

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

1466

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

1467

0)

2047

1468

# if self.interface:

2048

1469

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

2049

1470

# 0, # port

2063

1484

2064

1485

Assumes a gobject.MainLoop event loop.

2065

1486

"""

2066

2067

1487

def __init__(self, server_address, RequestHandlerClass,

2068

interface=None,

2069

use_ipv6=True,

2070

clients=None,

2071

gnutls_priority=None,

2072

use_dbus=True,

2073

socketfd=None):

1488

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

1489

gnutls_priority=None, use_dbus=True):

2074

1490

self.enabled = False

2075

1491

self.clients = clients

2076

1492

if self.clients is None:

2077

self.clients = {}

1493

self.clients = set()

2078

1494

self.use_dbus = use_dbus

2079

1495

self.gnutls_priority = gnutls_priority

2080

1496

IPv6_TCPServer.__init__(self, server_address,

2081

1497

RequestHandlerClass,

2082

1498

interface = interface,

2083

use_ipv6 = use_ipv6,

2084

socketfd = socketfd)

2085

1499

use_ipv6 = use_ipv6)

2086

1500

def server_activate(self):

2087

1501

if self.enabled:

2088

1502

return socketserver.TCPServer.server_activate(self)

2089

2090

1503

def enable(self):

2091

1504

self.enabled = True

2092

2093

def add_pipe(self, parent_pipe, proc):

1505

def add_pipe(self, parent_pipe):

2094

1506

# Call "handle_ipc" for both data and EOF events

2095

gobject.io_add_watch(

2096

parent_pipe.fileno(),

2097

gobject.IO_IN | gobject.IO_HUP,

2098

functools.partial(self.handle_ipc,

2099

parent_pipe = parent_pipe,

2100

proc = proc))

2101

2102

def handle_ipc(self, source, condition,

2103

parent_pipe=None,

2104

proc = None,

1507

gobject.io_add_watch(parent_pipe.fileno(),

1508

gobject.IO_IN | gobject.IO_HUP,

1509

functools.partial(self.handle_ipc,

1510

parent_pipe = parent_pipe))

1511

1512

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

2105

1513

client_object=None):

2106

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

2107

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

2108

# Wait for other process to exit

2109

proc.join()

1514

condition_names = {

1515

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

1516

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

1517

# blocking).

1518

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

1519

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

1520

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

1521

# broken, usually for pipes and

1522

# sockets).

1523

}

1524

conditions_string = ' | '.join(name

1525

for cond, name in

1526

condition_names.iteritems()

1527

if cond & condition)

1528

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

1529

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

2110

1530

return False

2111

1531

2112

1532

# Read a request from the child

2117

1537

fpr = request[1]

2118

1538

address = request[2]

2119

1539

2120

for c in self.clients.itervalues():

1540

for c in self.clients:

2121

1541

if c.fingerprint == fpr:

2122

1542

client = c

2123

1543

break

2124

1544

else:

2125

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

2126

"dress: %s", fpr, address)

1545

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

1546

"dress: %s", fpr, address)

2127

1547

if self.use_dbus:

2128

1548

# Emit D-Bus signal

2129

mandos_dbus_service.ClientNotFound(fpr,

2130

address[0])

1549

mandos_dbus_service.ClientNotFound(fpr, address[0])

2131

1550

parent_pipe.send(False)

2132

1551

return False

2133

1552

2134

gobject.io_add_watch(

2135

parent_pipe.fileno(),

2136

gobject.IO_IN | gobject.IO_HUP,

2137

functools.partial(self.handle_ipc,

2138

parent_pipe = parent_pipe,

2139

proc = proc,

2140

client_object = client))

1553

gobject.io_add_watch(parent_pipe.fileno(),

1554

gobject.IO_IN | gobject.IO_HUP,

1555

functools.partial(self.handle_ipc,

1556

parent_pipe = parent_pipe,

1557

client_object = client))

2141

1558

parent_pipe.send(True)

2142

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

2143

# same fileno

1559

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

2144

1560

return False

2145

1561

if command == 'funcall':

2146

1562

funcname = request[1]

2147

1563

args = request[2]

2148

1564

kwargs = request[3]

2149

1565

2150

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

2151

funcname)(*args,

2152

**kwargs)))

2153

1566

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

1567

2154

1568

if command == 'getattr':

2155

1569

attrname = request[1]

2156

if isinstance(client_object.__getattribute__(attrname),

2157

collections.Callable):

2158

parent_pipe.send(('function', ))

1570

if callable(client_object.__getattribute__(attrname)):

1571

parent_pipe.send(('function',))

2159

1572

else:

2160

parent_pipe.send((

2161

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

1573

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

2162

1574

2163

1575

if command == 'setattr':

2164

1576

attrname = request[1]

2165

1577

value = request[2]

2166

1578

setattr(client_object, attrname, value)

2167

1579

2168

1580

return True

2169

1581

2170

1582

2171

def rfc3339_duration_to_delta(duration):

2172

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

2173

2174

>>> rfc3339_duration_to_delta("P7D")

2175

datetime.timedelta(7)

2176

>>> rfc3339_duration_to_delta("PT60S")

2177

datetime.timedelta(0, 60)

2178

>>> rfc3339_duration_to_delta("PT60M")

2179

datetime.timedelta(0, 3600)

2180

>>> rfc3339_duration_to_delta("PT24H")

2181

datetime.timedelta(1)

2182

>>> rfc3339_duration_to_delta("P1W")

2183

datetime.timedelta(7)

2184

>>> rfc3339_duration_to_delta("PT5M30S")

2185

datetime.timedelta(0, 330)

2186

>>> rfc3339_duration_to_delta("P1DT3M20S")

2187

datetime.timedelta(1, 200)

2188

"""

2189

2190

# Parsing an RFC 3339 duration with regular expressions is not

2191

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

2192

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

2193

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

2194

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

2195

# avoid excessive use of external libraries.

2196

2197

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

2198

Token = collections.namedtuple("Token", (

2199

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

2200

# a "group" containing digits

2201

"value", # datetime.timedelta or None

2202

"followers")) # Tokens valid after this token

2203

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

2204

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

2205

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

2206

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

2207

datetime.timedelta(seconds=1),

2208

frozenset((token_end, )))

2209

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

2210

datetime.timedelta(minutes=1),

2211

frozenset((token_second, token_end)))

2212

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

2213

datetime.timedelta(hours=1),

2214

frozenset((token_minute, token_end)))

2215

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

2216

None,

2217

frozenset((token_hour, token_minute,

2218

token_second)))

2219

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

2220

datetime.timedelta(days=1),

2221

frozenset((token_time, token_end)))

2222

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

2223

datetime.timedelta(weeks=4),

2224

frozenset((token_day, token_end)))

2225

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

2226

datetime.timedelta(weeks=52),

2227

frozenset((token_month, token_end)))

2228

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

2229

datetime.timedelta(weeks=1),

2230

frozenset((token_end, )))

2231

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

2232

frozenset((token_year, token_month,

2233

token_day, token_time,

2234

token_week)))

2235

# Define starting values

2236

value = datetime.timedelta() # Value so far

2237

found_token = None

2238

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

2239

s = duration # String left to parse

2240

# Loop until end token is found

2241

while found_token is not token_end:

2242

# Search for any currently valid tokens

2243

for token in followers:

2244

match = token.regexp.match(s)

2245

if match is not None:

2246

# Token found

2247

if token.value is not None:

2248

# Value found, parse digits

2249

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

2250

# Add to value so far

2251

value += factor * token.value

2252

# Strip token from string

2253

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

2254

# Go to found token

2255

found_token = token

2256

# Set valid next tokens

2257

followers = found_token.followers

2258

break

2259

else:

2260

# No currently valid tokens were found

2261

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

2262

.format(duration))

2263

# End token found

2264

return value

2265

2266

2267

1583

def string_to_delta(interval):

2268

1584

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

2269

1585

2280

1596

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

2281

1597

datetime.timedelta(0, 330)

2282

1598

"""

2283

2284

try:

2285

return rfc3339_duration_to_delta(interval)

2286

except ValueError:

2287

pass

2288

2289

1599

timevalue = datetime.timedelta(0)

2290

1600

for s in interval.split():

2291

1601

try:

2292

suffix = s[-1]

1602

suffix = unicode(s[-1])

2293

1603

value = int(s[:-1])

2294

1604

if suffix == "d":

2295

1605

delta = datetime.timedelta(value)

2302

1612

elif suffix == "w":

2303

1613

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

2304

1614

else:

2305

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

2306

except IndexError as e:

1615

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

1616

except (ValueError, IndexError), e:

2307

1617

raise ValueError(*(e.args))

2308

1618

timevalue += delta

2309

1619

return timevalue

2310

1620

2311

1621

1622

def if_nametoindex(interface):

1623

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

1624

1625

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

1626

global if_nametoindex

1627

try:

1628

if_nametoindex = (ctypes.cdll.LoadLibrary

1629

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

1630

.if_nametoindex)

1631

except (OSError, AttributeError):

1632

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

1633

def if_nametoindex(interface):

1634

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

1635

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

1636

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

1637

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1638

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

1639

interface))

1640

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

1641

ifreq[16:20])[0]

1642

return interface_index

1643

return if_nametoindex(interface)

1644

1645

2312

1646

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

2313

1647

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

2314

1648

2322

1656

sys.exit()

2323

1657

if not noclose:

2324

1658

# Close all standard open file descriptors

2325

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

1659

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

2326

1660

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

2327

1661

raise OSError(errno.ENODEV,

2328

"{} not a character device"

2329

.format(os.devnull))

1662

"%s not a character device"

1663

% os.path.devnull)

2330

1664

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

2331

1665

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

2332

1666

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

2341

1675

2342

1676

parser = argparse.ArgumentParser()

2343

1677

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

2344

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

1678

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

2345

1679

help="show version number and exit")

2346

1680

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

2347

1681

help="Bind to interface IF")

2353

1687

help="Run self-test")

2354

1688

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

2355

1689

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

2356

" to terminal", default=None)

1690

" to terminal")

2357

1691

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

2358

1692

help="Debug level for stdout output")

2359

1693

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

2366

1700

" files")

2367

1701

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

2368

1702

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

2369

" system bus interface", default=None)

1703

" system bus interface")

2370

1704

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

2371

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

2372

default=None)

2373

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

2374

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

2375

" state", default=None)

2376

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

2377

help="Specify a file descriptor to a network"

2378

" socket to use instead of creating one")

2379

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

2380

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

2381

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

2382

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

2383

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

2384

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

2385

default=None)

2386

1705

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

2387

1706

options = parser.parse_args()

2388

1707

2389

1708

if options.check:

2390

1709

import doctest

2391

fail_count, test_count = doctest.testmod()

2392

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

1710

doctest.testmod()

1711

sys.exit()

2393

1712

2394

1713

# Default values for config file for server-global settings

2395

1714

server_defaults = { "interface": "",

2397

1716

"port": "",

2398

1717

"debug": "False",

2399

1718

"priority":

2400

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

2401

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

1719

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

2402

1720

"servicename": "Mandos",

2403

1721

"use_dbus": "True",

2404

1722

"use_ipv6": "True",

2405

1723

"debuglevel": "",

2406

"restore": "True",

2407

"socket": "",

2408

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

2409

"foreground": "False",

2410

"zeroconf": "True",

2411

}

1724

}

2412

1725

2413

1726

# Parse config file for server-global settings

2414

1727

server_config = configparser.SafeConfigParser(server_defaults)

2415

1728

del server_defaults

2416

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

1729

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

1730

"mandos.conf"))

2417

1731

# Convert the SafeConfigParser object to a dict

2418

1732

server_settings = server_config.defaults()

2419

1733

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

2420

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

1734

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

2421

1735

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

2422

1736

option)

2423

1737

if server_settings["port"]:

2424

1738

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

2425

1739

"port")

2426

if server_settings["socket"]:

2427

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

2428

"socket")

2429

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

2430

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

2431

# happen with a supplied network socket.

2432

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

2433

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

2434

["socket"])

2435

1740

del server_config

2436

1741

2437

1742

# Override the settings from the config file with command line

2438

1743

# options, if set.

2439

1744

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

2440

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

2441

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

2442

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

1745

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

1746

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

2443

1747

value = getattr(options, option)

2444

1748

if value is not None:

2445

1749

server_settings[option] = value

2446

1750

del options

2447

1751

# Force all strings to be unicode

2448

1752

for option in server_settings.keys():

2449

if isinstance(server_settings[option], bytes):

2450

server_settings[option] = (server_settings[option]

2451

.decode("utf-8"))

2452

# Force all boolean options to be boolean

2453

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

2454

"foreground", "zeroconf"):

2455

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

2456

# Debug implies foreground

2457

if server_settings["debug"]:

2458

server_settings["foreground"] = True

1753

if type(server_settings[option]) is str:

1754

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

2459

1755

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

2460

1756

2461

1757

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

2462

1758

2463

if (not server_settings["zeroconf"]

2464

and not (server_settings["port"]

2465

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

2466

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

2467

2468

1759

# For convenience

2469

1760

debug = server_settings["debug"]

2470

1761

debuglevel = server_settings["debuglevel"]

2471

1762

use_dbus = server_settings["use_dbus"]

2472

1763

use_ipv6 = server_settings["use_ipv6"]

2473

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

2474

stored_state_file)

2475

foreground = server_settings["foreground"]

2476

zeroconf = server_settings["zeroconf"]

2477

2478

if debug:

2479

initlogger(debug, logging.DEBUG)

2480

else:

2481

if not debuglevel:

2482

initlogger(debug)

2483

else:

2484

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

2485

initlogger(debug, level)

2486

1764

2487

1765

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

2488

syslogger.setFormatter(

2489

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

2490

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

2491

server_settings["servicename"])))

1766

syslogger.setFormatter(logging.Formatter

1767

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

1768

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

1769

% server_settings["servicename"]))

2492

1770

2493

1771

# Parse config file with clients

2494

client_config = configparser.SafeConfigParser(Client

2495

.client_defaults)

1772

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

1773

"interval": "5m",

1774

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

1775

"host": "",

1776

"approval_delay": "0s",

1777

"approval_duration": "1s",

1778

}

1779

client_config = configparser.SafeConfigParser(client_defaults)

2496

1780

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

2497

1781

"clients.conf"))

2498

1782

2499

1783

global mandos_dbus_service

2500

1784

mandos_dbus_service = None

2501

1785

2502

socketfd = None

2503

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

2504

socketfd = server_settings["socket"]

2505

tcp_server = MandosServer(

2506

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

2507

ClientHandler,

2508

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

2509

use_ipv6=use_ipv6,

2510

gnutls_priority=server_settings["priority"],

2511

use_dbus=use_dbus,

2512

socketfd=socketfd)

2513

if not foreground:

2514

pidfilename = "/run/mandos.pid"

2515

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

2516

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

2517

pidfile = None

1786

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

1787

server_settings["port"]),

1788

ClientHandler,

1789

interface=(server_settings["interface"]

1790

or None),

1791

use_ipv6=use_ipv6,

1792

gnutls_priority=

1793

server_settings["priority"],

1794

use_dbus=use_dbus)

1795

if not debug:

1796

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

2518

1797

try:

2519

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

2520

except IOError as e:

2521

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

2522

exc_info=e)

1798

pidfile = open(pidfilename, "w")

1799

except IOError:

1800

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

2523

1801

2524

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

1802

try:

1803

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

1804

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

1805

except KeyError:

2525

1806

try:

2526

uid = pwd.getpwnam(name).pw_uid

2527

gid = pwd.getpwnam(name).pw_gid

2528

break

1807

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

1808

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

2529

1809

except KeyError:

2530

continue

2531

else:

2532

uid = 65534

2533

gid = 65534

1810

try:

1811

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

1812

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

1813

except KeyError:

1814

uid = 65534

1815

gid = 65534

2534

1816

try:

2535

1817

os.setgid(gid)

2536

1818

os.setuid(uid)

2537

except OSError as error:

2538

if error.errno != errno.EPERM:

2539

raise

1819

except OSError, error:

1820

if error[0] != errno.EPERM:

1821

raise error

2540

1822

1823

if not debug and not debuglevel:

1824

syslogger.setLevel(logging.WARNING)

1825

console.setLevel(logging.WARNING)

1826

if debuglevel:

1827

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

1828

syslogger.setLevel(level)

1829

console.setLevel(level)

1830

2541

1831

if debug:

2542

1832

# Enable all possible GnuTLS debugging

2543

1833

2549

1839

def debug_gnutls(level, string):

2550

1840

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

2551

1841

2552

gnutls.library.functions.gnutls_global_set_log_function(

2553

debug_gnutls)

1842

(gnutls.library.functions

1843

.gnutls_global_set_log_function(debug_gnutls))

2554

1844

2555

1845

# Redirect stdin so all checkers get /dev/null

2556

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

1846

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

2557

1847

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

2558

1848

if null > 2:

2559

1849

os.close(null)

1850

else:

1851

# No console logging

1852

logger.removeHandler(console)

2560

1853

2561

1854

# Need to fork before connecting to D-Bus

2562

if not foreground:

1855

if not debug:

2563

1856

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

2564

1857

daemon()

2565

1858

2566

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

2567

# need to inform gobject that threads will be used.

2568

gobject.threads_init()

2569

2570

1859

global main_loop

2571

1860

# From the Avahi example code

2572

DBusGMainLoop(set_as_default=True)

1861

DBusGMainLoop(set_as_default=True )

2573

1862

main_loop = gobject.MainLoop()

2574

1863

bus = dbus.SystemBus()

2575

1864

# End of Avahi example code

2576

1865

if use_dbus:

2577

1866

try:

2578

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

2579

bus,

2580

do_not_queue=True)

2581

old_bus_name = dbus.service.BusName(

2582

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

2583

do_not_queue=True)

2584

except dbus.exceptions.DBusException as e:

2585

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

1867

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

1868

bus, do_not_queue=True)

1869

except dbus.exceptions.NameExistsException, e:

1870

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

2586

1871

use_dbus = False

2587

1872

server_settings["use_dbus"] = False

2588

1873

tcp_server.use_dbus = False

2589

if zeroconf:

2590

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2591

service = AvahiServiceToSyslog(

2592

name = server_settings["servicename"],

2593

servicetype = "_mandos._tcp",

2594

protocol = protocol,

2595

bus = bus)

2596

if server_settings["interface"]:

2597

service.interface = if_nametoindex(

2598

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

1874

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

1875

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

1876

servicetype = "_mandos._tcp",

1877

protocol = protocol, bus = bus)

1878

if server_settings["interface"]:

1879

service.interface = (if_nametoindex

1880

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

2599

1881

2600

1882

global multiprocessing_manager

2601

1883

multiprocessing_manager = multiprocessing.Manager()

2603

1885

client_class = Client

2604

1886

if use_dbus:

2605

1887

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

2606

2607

client_settings = Client.config_parser(client_config)

2608

old_client_settings = {}

2609

clients_data = {}

2610

2611

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

2612

global wnull

2613

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

2614

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

2615

# mode

2616

if debug or not foreground:

2617

wnull.close()

2618

2619

# Get client data and settings from last running state.

2620

if server_settings["restore"]:

2621

try:

2622

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

2623

clients_data, old_client_settings = pickle.load(

2624

stored_state)

2625

os.remove(stored_state_path)

2626

except IOError as e:

2627

if e.errno == errno.ENOENT:

2628

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

2629

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

2630

else:

2631

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

2632

exc_info=e)

2633

raise

2634

except EOFError as e:

2635

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

2636

"EOFError:",

2637

exc_info=e)

2638

2639

with PGPEngine() as pgp:

2640

for client_name, client in clients_data.items():

2641

# Skip removed clients

2642

if client_name not in client_settings:

2643

continue

2644

2645

# Decide which value to use after restoring saved state.

2646

# We have three different values: Old config file,

2647

# new config file, and saved state.

2648

# New config value takes precedence if it differs from old

2649

# config value, otherwise use saved state.

2650

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

2651

try:

2652

# For each value in new config, check if it

2653

# differs from the old config value (Except for

2654

# the "secret" attribute)

2655

if (name != "secret"

2656

and (value !=

2657

old_client_settings[client_name][name])):

2658

client[name] = value

2659

except KeyError:

2660

pass

2661

2662

# Clients who has passed its expire date can still be

2663

# enabled if its last checker was successful. Clients

2664

# whose checker succeeded before we stored its state is

2665

# assumed to have successfully run all checkers during

2666

# downtime.

2667

if client["enabled"]:

2668

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

2669

if not client["last_checked_ok"]:

2670

logger.warning(

2671

"disabling client {} - Client never "

2672

"performed a successful checker".format(

2673

client_name))

2674

client["enabled"] = False

2675

elif client["last_checker_status"] != 0:

2676

logger.warning(

2677

"disabling client {} - Client last"

2678

" checker failed with error code"

2679

" {}".format(

2680

client_name,

2681

client["last_checker_status"]))

2682

client["enabled"] = False

2683

else:

2684

client["expires"] = (

2685

datetime.datetime.utcnow()

2686

+ client["timeout"])

2687

logger.debug("Last checker succeeded,"

2688

" keeping {} enabled".format(

2689

client_name))

1888

def client_config_items(config, section):

1889

special_settings = {

1890

"approved_by_default":

1891

lambda: config.getboolean(section,

1892

"approved_by_default"),

1893

}

1894

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

2690

1895

try:

2691

client["secret"] = pgp.decrypt(

2692

client["encrypted_secret"],

2693

client_settings[client_name]["secret"])

2694

except PGPError:

2695

# If decryption fails, we use secret from new settings

2696

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

2697

client_name))

2698

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

2699

["secret"])

2700

2701

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

2702

for client_name in (set(old_client_settings)

2703

- set(client_settings)):

2704

del clients_data[client_name]

2705

for client_name in (set(client_settings)

2706

- set(old_client_settings)):

2707

clients_data[client_name] = client_settings[client_name]

2708

2709

# Create all client objects

2710

for client_name, client in clients_data.items():

2711

tcp_server.clients[client_name] = client_class(

2712

name = client_name,

2713

settings = client,

2714

server_settings = server_settings)

2715

1896

yield (name, special_settings[name]())

1897

except KeyError:

1898

yield (name, value)

1899

1900

tcp_server.clients.update(set(

1901

client_class(name = section,

1902

config= dict(client_config_items(

1903

client_config, section)))

1904

for section in client_config.sections()))

2716

1905

if not tcp_server.clients:

2717

1906

logger.warning("No clients defined")

2718

2719

if not foreground:

2720

if pidfile is not None:

2721

pid = os.getpid()

2722

try:

2723

with pidfile:

2724

print(pid, file=pidfile)

2725

except IOError:

2726

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

2727

pidfilename, pid)

2728

del pidfile

1907

1908

if not debug:

1909

try:

1910

with pidfile:

1911

pid = os.getpid()

1912

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

1913

del pidfile

1914

except IOError:

1915

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

1916

pidfilename, pid)

1917

except NameError:

1918

# "pidfile" was never created

1919

pass

2729

1920

del pidfilename

2730

1921

1922

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

1923

2731

1924

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

2732

1925

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

2733

1926

2734

1927

if use_dbus:

2735

2736

@alternate_dbus_interfaces(

2737

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

2738

class MandosDBusService(DBusObjectWithProperties):

1928

class MandosDBusService(dbus.service.Object):

2739

1929

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

2740

2741

1930

def __init__(self):

2742

1931

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

2743

2744

_interface = "se.recompile.Mandos"

2745

2746

@dbus_interface_annotations(_interface)

2747

def _foo(self):

2748

return {

2749

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

2750

"false" }

1932

_interface = "se.bsnet.fukt.Mandos"

2751

1933

2752

1934

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

2753

1935

def ClientAdded(self, objpath):

2767

1949

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

2768

1950

def GetAllClients(self):

2769

1951

"D-Bus method"

2770

return dbus.Array(c.dbus_object_path for c in

2771

tcp_server.clients.itervalues())

1952

return dbus.Array(c.dbus_object_path

1953

for c in tcp_server.clients)

2772

1954

2773

1955

@dbus.service.method(_interface,

2774

1956

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

2775

1957

def GetAllClientsWithProperties(self):

2776

1958

"D-Bus method"

2777

1959

return dbus.Dictionary(

2778

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

2779

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

1960

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

1961

for c in tcp_server.clients),

2780

1962

signature="oa{sv}")

2781

1963

2782

1964

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

2783

1965

def RemoveClient(self, object_path):

2784

1966

"D-Bus method"

2785

for c in tcp_server.clients.itervalues():

1967

for c in tcp_server.clients:

2786

1968

if c.dbus_object_path == object_path:

2787

del tcp_server.clients[c.name]

1969

tcp_server.clients.remove(c)

2788

1970

c.remove_from_connection()

2789

1971

# Don't signal anything except ClientRemoved

2790

1972

c.disable(quiet=True)

2799

1981

2800

1982

def cleanup():

2801

1983

"Cleanup function; run on exit"

2802

if zeroconf:

2803

service.cleanup()

2804

2805

multiprocessing.active_children()

2806

wnull.close()

2807

if not (tcp_server.clients or client_settings):

2808

return

2809

2810

# Store client before exiting. Secrets are encrypted with key

2811

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

2812

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

2813

clients = {}

2814

with PGPEngine() as pgp:

2815

for client in tcp_server.clients.itervalues():

2816

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

2817

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

2818

key)

2819

client_dict = {}

2820

2821

# A list of attributes that can not be pickled

2822

# + secret.

2823

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

2824

"checker", "server_settings" }

2825

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

2826

.Object):

2827

exclude.add(name)

2828

2829

client_dict["encrypted_secret"] = (client

2830

.encrypted_secret)

2831

for attr in client.client_structure:

2832

if attr not in exclude:

2833

client_dict[attr] = getattr(client, attr)

2834

2835

clients[client.name] = client_dict

2836

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

2837

2838

try:

2839

with tempfile.NamedTemporaryFile(

2840

mode='wb',

2841

suffix=".pickle",

2842

prefix='clients-',

2843

dir=os.path.dirname(stored_state_path),

2844

delete=False) as stored_state:

2845

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

2846

tempname = stored_state.name

2847

os.rename(tempname, stored_state_path)

2848

except (IOError, OSError) as e:

2849

if not debug:

2850

try:

2851

os.remove(tempname)

2852

except NameError:

2853

pass

2854

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

2855

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

2856

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

2857

else:

2858

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

2859

exc_info=e)

2860

raise

2861

2862

# Delete all clients, and settings from config

1984

service.cleanup()

1985

2863

1986

while tcp_server.clients:

2864

name, client = tcp_server.clients.popitem()

1987

client = tcp_server.clients.pop()

2865

1988

if use_dbus:

2866

1989

client.remove_from_connection()

1990

client.disable_hook = None

2867

1991

# Don't signal anything except ClientRemoved

2868

1992

client.disable(quiet=True)

2869

1993

if use_dbus:

2870

1994

# Emit D-Bus signal

2871

mandos_dbus_service.ClientRemoved(

2872

client.dbus_object_path, client.name)

2873

client_settings.clear()

1995

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

1996

client.name)

2874

1997

2875

1998

atexit.register(cleanup)

2876

1999

2877

for client in tcp_server.clients.itervalues():

2000

for client in tcp_server.clients:

2878

2001

if use_dbus:

2879

2002

# Emit D-Bus signal

2880

2003

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2881

# Need to initiate checking of clients

2882

if client.enabled:

2883

client.init_checker()

2004

client.enable()

2884

2005

2885

2006

tcp_server.enable()

2886

2007

tcp_server.server_activate()

2887

2008

2888

2009

# Find out what port we got

2889

if zeroconf:

2890

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

2010

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

2891

2011

if use_ipv6:

2892

2012

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

2893

" flowinfo %d, scope_id %d",

2894

*tcp_server.socket.getsockname())

2013

" flowinfo %d, scope_id %d"

2014

% tcp_server.socket.getsockname())

2895

2015

else: # IPv4

2896

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

2897

*tcp_server.socket.getsockname())

2016

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

2017

% tcp_server.socket.getsockname())

2898

2018

2899

2019

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

2900

2020

2901

2021

try:

2902

if zeroconf:

2903

# From the Avahi example code

2904

try:

2905

service.activate()

2906

except dbus.exceptions.DBusException as error:

2907

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

2908

cleanup()

2909

sys.exit(1)

2910

# End of Avahi example code

2022

# From the Avahi example code

2023

try:

2024

service.activate()

2025

except dbus.exceptions.DBusException, error:

2026

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

2027

cleanup()

2028

sys.exit(1)

2029

# End of Avahi example code

2911

2030

2912

2031

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

2913

2032

lambda *args, **kwargs:

2916

2035

2917

2036

logger.debug("Starting main loop")

2918

2037

main_loop.run()

2919

except AvahiError as error:

2920

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

2038

except AvahiError, error:

2039

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

2921

2040

cleanup()

2922

2041

sys.exit(1)

2923

2042

except KeyboardInterrupt:

2928

2047

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

2929

2048

cleanup()

2930

2049

2931

2932

2050

if __name__ == '__main__':

2933

2051

main()