/mandos/trunk : revision 520

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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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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 hashlib

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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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import ctypes.util

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import xml.dom.minidom

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import inspect

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import Crypto.Cipher.AES

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try:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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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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version = "1.4.1"

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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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stored_state_path = "/var/lib/mandos/clients.pickle"

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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('%(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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class AvahiError(Exception):

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

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self.value = value

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

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**kwargs)

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

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def __unicode__(self):

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return unicode(repr(self.value))

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class AvahiServiceError(AvahiError):

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pass

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class AvahiGroupError(AvahiError):

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pass

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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def __init__(self,

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interface = avahi.IF_UNSPEC,

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name = None,

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servicetype = None,

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port = None,

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TXT = None,

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domain = "",

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host = "",

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max_renames = 32768,

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protocol = avahi.PROTO_UNSPEC,

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bus = None):

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

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

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

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protocol = avahi.PROTO_UNSPEC, bus = None):

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self.interface = interface

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self.name = name

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self.type = servicetype

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self, remove=True):

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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

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" after %i retries, exiting.",

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self.rename_count)

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raise AvahiServiceError("Too many renames")

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self.name = str(

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self.server.GetAlternativeServiceName(self.name))

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self.rename_count += 1

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self.name = unicode(self.server

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.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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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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if (error.get_dbus_name()

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

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

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return self.rename(remove=False)

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else:

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

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self.cleanup()

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os._exit(1)

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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self.rename()

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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str(error))

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

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unicode(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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def cleanup(self):

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

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException):

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dbus.exceptions.DBusException) as e:

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pass

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self.group = None

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self.remove()

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

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

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

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bad_states = {

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avahi.SERVER_INVALID: "Zeroconf server invalid",

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avahi.SERVER_REGISTERING: None,

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avahi.SERVER_COLLISION: "Zeroconf server name collision",

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avahi.SERVER_FAILURE: "Zeroconf server failure",

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}

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bad_states = { avahi.SERVER_INVALID:

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"Zeroconf server invalid",

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avahi.SERVER_REGISTERING: None,

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avahi.SERVER_COLLISION:

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"Zeroconf server name collision",

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avahi.SERVER_FAILURE:

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"Zeroconf server failure" }

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if state in bad_states:

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if bad_states[state] is not None:

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if error is None:

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

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else:

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

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def activate(self):

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

407

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if self.server is None:

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follow_name_owner_changes=True),

412

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avahi.DBUS_INTERFACE_SERVER)

413

265

self.server.connect_to_signal("StateChanged",

414

self.server_state_changed)

266

self.server_state_changed)

415

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

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417

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class AvahiServiceToSyslog(AvahiService):

419

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

270

def rename(self):

420

271

"""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)))

272

ret = AvahiService.rename(self)

273

syslogger.setFormatter(logging.Formatter

274

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

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

276

% self.name))

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return ret

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def _timedelta_to_milliseconds(td):

280

"Convert a datetime.timedelta() to milliseconds"

281

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

282

+ (td.seconds * 1000)

283

+ (td.microseconds // 1000))

284

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class Client(object):

429

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

430

287

431

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Attributes:

432

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

289

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

433

290

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

434

291

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

435

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

453

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

454

311

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

313

last_checker_status: integer between 0 and 255 reflecting exit status

314

of last checker. -1 reflect crashed checker,

315

or None.

316

last_enabled: datetime.datetime(); (UTC)

460

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

461

318

D-Bus identifiers

462

319

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

463

320

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

464

321

until this client is disabled

465

extended_timeout: extra long timeout when secret has been sent

322

extended_timeout: extra long timeout when password has been sent

466

323

runtime_expansions: Allowed attributes for runtime expansion.

467

324

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

468

325

disabled, or None

469

server_settings: The server_settings dict from main()

470

326

"""

471

327

472

328

runtime_expansions = ("approval_delay", "approval_duration",

473

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

474

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

475

"last_approval_request", "last_checked_ok",

329

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

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

476

331

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

477

client_defaults = {

478

"timeout": "PT5M",

479

"extended_timeout": "PT15M",

480

"interval": "PT2M",

481

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

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"host": "",

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"approval_delay": "PT0S",

484

"approval_duration": "PT1S",

485

"approved_by_default": "True",

486

"enabled": "True",

487

}

488

489

@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):

332

333

def timeout_milliseconds(self):

334

"Return the 'timeout' attribute in milliseconds"

335

return _timedelta_to_milliseconds(self.timeout)

336

337

def extended_timeout_milliseconds(self):

338

"Return the 'extended_timeout' attribute in milliseconds"

339

return _timedelta_to_milliseconds(self.extended_timeout)

340

341

def interval_milliseconds(self):

342

"Return the 'interval' attribute in milliseconds"

343

return _timedelta_to_milliseconds(self.interval)

344

345

def approval_delay_milliseconds(self):

346

return _timedelta_to_milliseconds(self.approval_delay)

347

348

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

349

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

350

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

351

attribute."""

540

352

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

353

if config is None:

354

config = {}

558

355

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

356

# Uppercase and remove spaces from fingerprint for later

357

# comparison purposes with return value from the fingerprint()

358

# function

359

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

360

.replace(" ", ""))

559

361

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

560

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

561

datetime.datetime.utcnow())

562

563

# attributes specific for this server instance

362

if "secret" in config:

363

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

364

elif "secfile" in config:

365

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

366

(config["secfile"])),

367

"rb") as secfile:

368

self.secret = secfile.read()

369

else:

370

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

371

% self.name)

372

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

373

self.created = datetime.datetime.utcnow()

374

self.enabled = True

375

self.last_approval_request = None

376

self.last_enabled = datetime.datetime.utcnow()

377

self.last_checked_ok = None

378

self.last_checker_status = None

379

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

380

self.extended_timeout = string_to_delta(config

381

["extended_timeout"])

382

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

564

383

self.checker = None

565

384

self.checker_initiator_tag = None

566

385

self.disable_initiator_tag = None

386

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

567

387

self.checker_callback_tag = None

388

self.checker_command = config["checker"]

568

389

self.current_checker_command = None

569

self.approved = None

390

self._approved = None

391

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

392

True)

570

393

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("_")]

394

self.approval_delay = string_to_delta(

395

config["approval_delay"])

396

self.approval_duration = string_to_delta(

397

config["approval_duration"])

398

self.changedstate = (multiprocessing_manager

399

.Condition(multiprocessing_manager

400

.Lock()))

401

self.client_structure = [attr for attr in self.__dict__.iterkeys() if not attr.startswith("_")]

576

402

self.client_structure.append("client_structure")

577

578

for name, t in inspect.getmembers(

579

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

403

404

405

for name, t in inspect.getmembers(type(self),

406

lambda obj: isinstance(obj, property)):

580

407

if not name.startswith("_"):

581

408

self.client_structure.append(name)

582

409

590

417

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

591

418

# Already enabled

592

419

return

420

self.send_changedstate()

593

421

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

594

422

self.enabled = True

595

423

self.last_enabled = datetime.datetime.utcnow()

596

424

self.init_checker()

597

self.send_changedstate()

598

425

599

426

def disable(self, quiet=True):

600

427

"""Disable this client."""

601

428

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

602

429

return False

603

430

if not quiet:

431

self.send_changedstate()

432

if not quiet:

604

433

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

605

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

434

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

606

435

gobject.source_remove(self.disable_initiator_tag)

607

436

self.disable_initiator_tag = None

608

437

self.expires = None

609

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

438

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

610

439

gobject.source_remove(self.checker_initiator_tag)

611

440

self.checker_initiator_tag = None

612

441

self.stop_checker()

613

442

self.enabled = False

614

if not quiet:

615

self.send_changedstate()

616

443

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

617

444

return False

618

445

619

446

def __del__(self):

620

447

self.disable()

621

448

622

449

def init_checker(self):

623

450

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

624

451

# 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)

452

self.checker_initiator_tag = (gobject.timeout_add

453

(self.interval_milliseconds(),

454

self.start_checker))

630

455

# 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)

456

self.disable_initiator_tag = (gobject.timeout_add

457

(self.timeout_milliseconds(),

458

self.disable))

635

459

# Also start a new checker *right now*.

636

460

self.start_checker()

637

461

462

638

463

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

639

464

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

640

465

self.checker_callback_tag = None

641

466

self.checker = None

642

467

if os.WIFEXITED(condition):

643

self.last_checker_status = os.WEXITSTATUS(condition)

468

self.last_checker_status = os.WEXITSTATUS(condition)

644

469

if self.last_checker_status == 0:

645

470

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

646

471

vars(self))

647

472

self.checked_ok()

648

473

else:

649

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

474

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

475

vars(self))

650

476

else:

651

477

self.last_checker_status = -1

652

478

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

653

479

vars(self))

654

480

655

def checked_ok(self):

656

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

657

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."""

481

def checked_ok(self, timeout=None):

482

"""Bump up the timeout for this client.

483

484

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

485

alive and well.

486

"""

663

487

if timeout is None:

664

488

timeout = self.timeout

489

self.last_checked_ok = datetime.datetime.utcnow()

665

490

if self.disable_initiator_tag is not None:

666

491

gobject.source_remove(self.disable_initiator_tag)

667

self.disable_initiator_tag = None

668

492

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

669

self.disable_initiator_tag = gobject.timeout_add(

670

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

493

self.disable_initiator_tag = (gobject.timeout_add

494

(_timedelta_to_milliseconds

495

(timeout), self.disable))

671

496

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

672

497

673

498

def need_approval(self):

679

504

If a checker already exists, leave it running and do

680

505

nothing."""

681

506

# 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

507

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

508

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

509

# client would inevitably timeout, since no checker would get

510

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

686

511

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

687

512

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

688

513

# should be.

690

515

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

691

516

try:

692

517

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

518

except (AttributeError, OSError) as error:

519

if (isinstance(error, OSError)

520

and error.errno != errno.ECHILD):

521

raise error

698

522

else:

699

523

if pid:

700

524

logger.warning("Checker was a zombie")

703

527

self.current_checker_command)

704

528

# Start a new checker if needed

705

529

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

530

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

531

# In case checker_command has exactly one % operator

532

command = self.checker_command % self.host

533

except TypeError:

534

# Escape attributes for the shell

535

escaped_attrs = dict(

536

(attr,

537

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

538

errors=

539

'replace')))

540

for attr in

541

self.runtime_expansions)

542

543

try:

544

command = self.checker_command % escaped_attrs

545

except TypeError as error:

546

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

547

' %s', self.checker_command, error)

548

return True # Try again later

717

549

self.current_checker_command = command

718

550

try:

719

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

720

self.name)

551

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

552

command, self.name)

721

553

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

722

554

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

723

555

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

724

556

# 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

557

self.checker = subprocess.Popen(command,

734

558

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:

559

shell=True, cwd="/")

560

self.checker_callback_tag = (gobject.child_watch_add

561

(self.checker.pid,

562

self.checker_callback,

563

data=command))

564

# The checker may have completed before the gobject

565

# watch was added. Check for this.

747

566

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

567

if pid:

568

gobject.source_remove(self.checker_callback_tag)

569

self.checker_callback(pid, status, command)

748

570

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)

571

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

572

error)

758

573

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

759

574

return True

760

575

767

582

return

768

583

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

769

584

try:

770

self.checker.terminate()

585

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

771

586

#time.sleep(0.5)

772

587

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

773

# self.checker.kill()

588

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

774

589

except OSError as error:

775

590

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

776

591

raise

777

592

self.checker = None

778

593

779

780

def dbus_service_property(dbus_interface,

781

signature="v",

782

access="readwrite",

783

byte_arrays=False):

594

# Encrypts a client secret and stores it in a varible encrypted_secret

595

def encrypt_secret(self, key):

596

# Encryption-key need to be of a specific size, so we hash inputed key

597

hasheng = hashlib.sha256()

598

hasheng.update(key)

599

encryptionkey = hasheng.digest()

600

601

# Create validation hash so we know at decryption if it was sucessful

602

hasheng = hashlib.sha256()

603

hasheng.update(self.secret)

604

validationhash = hasheng.digest()

605

606

# Encrypt secret

607

iv = os.urandom(Crypto.Cipher.AES.block_size)

608

ciphereng = Crypto.Cipher.AES.new(encryptionkey,

609

Crypto.Cipher.AES.MODE_CFB, iv)

610

ciphertext = ciphereng.encrypt(validationhash+self.secret)

611

self.encrypted_secret = (ciphertext, iv)

612

613

# Decrypt a encrypted client secret

614

def decrypt_secret(self, key):

615

# Decryption-key need to be of a specific size, so we hash inputed key

616

hasheng = hashlib.sha256()

617

hasheng.update(key)

618

encryptionkey = hasheng.digest()

619

620

# Decrypt encrypted secret

621

ciphertext, iv = self.encrypted_secret

622

ciphereng = Crypto.Cipher.AES.new(encryptionkey,

623

Crypto.Cipher.AES.MODE_CFB, iv)

624

plain = ciphereng.decrypt(ciphertext)

625

626

# Validate decrypted secret to know if it was succesful

627

hasheng = hashlib.sha256()

628

validationhash = plain[:hasheng.digest_size]

629

secret = plain[hasheng.digest_size:]

630

hasheng.update(secret)

631

632

# if validation fails, we use key as new secret. Otherwhise, we use

633

# the decrypted secret

634

if hasheng.digest() == validationhash:

635

self.secret = secret

636

else:

637

self.secret = key

638

del self.encrypted_secret

639

640

641

def dbus_service_property(dbus_interface, signature="v",

642

access="readwrite", byte_arrays=False):

784

643

"""Decorators for marking methods of a DBusObjectWithProperties to

785

644

become properties on the D-Bus.

786

645

795

654

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

796

655

if byte_arrays and signature != "ay":

797

656

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

798

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

799

657

" signature %r" % signature)

800

658

def decorator(func):

801

659

func._dbus_is_property = True

802

660

func._dbus_interface = dbus_interface

807

665

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

808

666

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

809

667

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

668

return decorator

853

669

854

670

855

671

class DBusPropertyException(dbus.exceptions.DBusException):

856

672

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

857

673

"""

858

pass

674

def __unicode__(self):

675

return unicode(str(self))

859

676

860

677

861

678

class DBusPropertyAccessException(DBusPropertyException):

879

696

"""

880

697

881

698

@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)

699

def _is_dbus_property(obj):

700

return getattr(obj, "_dbus_is_property", False)

890

701

891

def _get_all_dbus_things(self, thing):

702

def _get_all_dbus_properties(self):

892

703

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

893

704

"""

894

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

895

athing.__get__(self))

705

return ((prop.__get__(self)._dbus_name, prop.__get__(self))

896

706

for cls in self.__class__.__mro__

897

for name, athing in

898

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

707

for name, prop in

708

inspect.getmembers(cls, self._is_dbus_property))

899

709

900

710

def _get_dbus_property(self, interface_name, property_name):

901

711

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

902

712

property with the specified name and interface.

903

713

"""

904

for cls in self.__class__.__mro__:

905

for name, value in inspect.getmembers(

906

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

714

for cls in self.__class__.__mro__:

715

for name, value in (inspect.getmembers

716

(cls, self._is_dbus_property)):

907

717

if (value._dbus_name == property_name

908

718

and value._dbus_interface == interface_name):

909

719

return value.__get__(self)

910

720

911

721

# No such property

912

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

913

self.dbus_object_path, interface_name, property_name))

722

raise DBusPropertyNotFound(self.dbus_object_path + ":"

723

+ interface_name + "."

724

+ property_name)

914

725

915

@dbus.service.method(dbus.PROPERTIES_IFACE,

916

in_signature="ss",

726

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

917

727

out_signature="v")

918

728

def Get(self, interface_name, property_name):

919

729

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

937

747

# The byte_arrays option is not supported yet on

938

748

# signatures other than "ay".

939

749

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))

750

raise ValueError

751

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

752

for byte in value))

945

753

prop(value)

946

754

947

@dbus.service.method(dbus.PROPERTIES_IFACE,

948

in_signature="s",

755

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

949

756

out_signature="a{sv}")

950

757

def GetAll(self, interface_name):

951

758

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

953

760

954

761

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

955

762

"""

956

properties = {}

957

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

763

all = {}

764

for name, prop in self._get_all_dbus_properties():

958

765

if (interface_name

959

766

and interface_name != prop._dbus_interface):

960

767

# Interface non-empty but did not match

964

771

continue

965

772

value = prop()

966

773

if not hasattr(value, "variant_level"):

967

properties[name] = value

774

all[name] = value

968

775

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

776

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

777

value.variant_level+1)

778

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

980

779

981

780

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

982

781

out_signature="s",

983

782

path_keyword='object_path',

984

783

connection_keyword='connection')

985

784

def Introspect(self, object_path, connection):

986

"""Overloading of standard D-Bus method.

987

988

Inserts property tags and interface annotation tags.

785

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

989

786

"""

990

787

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

991

788

connection)

992

789

try:

993

790

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

994

995

791

def make_tag(document, name, prop):

996

792

e = document.createElement("property")

997

793

e.setAttribute("name", name)

998

794

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

999

795

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

1000

796

return e

1001

1002

797

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

1003

# Add property tags

1004

798

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

1005

799

for name, prop

1006

in self._get_all_dbus_things("property")

800

in self._get_all_dbus_properties()

1007

801

if prop._dbus_interface

1008

802

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

1009

803

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

804

# Add the names to the return values for the

1040

805

# "org.freedesktop.DBus.Properties" methods

1041

806

if (if_tag.getAttribute("name")

1056

821

except (AttributeError, xml.dom.DOMException,

1057

822

xml.parsers.expat.ExpatError) as error:

1058

823

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

1059

exc_info=error)

824

error)

1060

825

return xmlstring

1061

826

1062

827

1063

def datetime_to_dbus(dt, variant_level=0):

828

def datetime_to_dbus (dt, variant_level=0):

1064

829

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

1065

830

if dt is None:

1066

831

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).

832

return dbus.String(dt.isoformat(),

833

variant_level=variant_level)

834

835

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

836

.__metaclass__):

837

"""Applied to an empty subclass of a D-Bus object, this metaclass

838

will add additional D-Bus attributes matching a certain pattern.

1092

839

"""

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):

840

def __new__(mcs, name, bases, attr):

841

# Go through all the base classes which could have D-Bus

842

# methods, signals, or properties in them

843

for base in (b for b in bases

844

if issubclass(b, dbus.service.Object)):

845

# Go though all attributes of the base class

846

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

1101

847

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

1102

848

# with the wrong interface name

1103

849

if (not hasattr(attribute, "_dbus_interface")

1104

or not attribute._dbus_interface.startswith(

1105

orig_interface_name)):

850

or not attribute._dbus_interface

851

.startswith("se.recompile.Mandos")):

1106

852

continue

1107

853

# Create an alternate D-Bus interface name based on

1108

854

# the current name

1109

alt_interface = attribute._dbus_interface.replace(

1110

orig_interface_name, alt_interface_name)

1111

interface_names.add(alt_interface)

855

alt_interface = (attribute._dbus_interface

856

.replace("se.recompile.Mandos",

857

"se.bsnet.fukt.Mandos"))

1112

858

# Is this a D-Bus signal?

1113

859

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

1114

# Extract the original non-method undecorated

1115

# function by black magic

860

# Extract the original non-method function by

861

# black magic

1116

862

nonmethod_func = (dict(

1117

zip(attribute.func_code.co_freevars,

1118

attribute.__closure__))

1119

["func"].cell_contents)

863

zip(attribute.func_code.co_freevars,

864

attribute.__closure__))["func"]

865

.cell_contents)

1120

866

# Create a new, but exactly alike, function

1121

867

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

1122

868

# with the alternate D-Bus interface name

1123

new_function = (dbus.service.signal(

1124

alt_interface, attribute._dbus_signature)

869

new_function = (dbus.service.signal

870

(alt_interface,

871

attribute._dbus_signature)

1125

872

(types.FunctionType(

1126

nonmethod_func.func_code,

1127

nonmethod_func.func_globals,

1128

nonmethod_func.func_name,

1129

nonmethod_func.func_defaults,

1130

nonmethod_func.func_closure)))

1131

# Copy annotations, if any

1132

try:

1133

new_function._dbus_annotations = dict(

1134

attribute._dbus_annotations)

1135

except AttributeError:

1136

pass

873

nonmethod_func.func_code,

874

nonmethod_func.func_globals,

875

nonmethod_func.func_name,

876

nonmethod_func.func_defaults,

877

nonmethod_func.func_closure)))

1137

878

# Define a creator of a function to call both the

1138

# original and alternate functions, so both the

1139

# original and alternate signals gets sent when

1140

# the function is called

879

# old and new functions, so both the old and new

880

# signals gets sent when the function is called

1141

881

def fixscope(func1, func2):

1142

882

"""This function is a scope container to pass

1143

883

func1 and func2 to the "call_both" function

1144

884

outside of its arguments"""

1145

1146

885

def call_both(*args, **kwargs):

1147

886

"""This function will emit two D-Bus

1148

887

signals by calling func1 and func2"""

1149

888

func1(*args, **kwargs)

1150

889

func2(*args, **kwargs)

1151

1152

890

return call_both

1153

891

# Create the "call_both" function and add it to

1154

892

# the class

1155

attr[attrname] = fixscope(attribute, new_function)

893

attr[attrname] = fixscope(attribute,

894

new_function)

1156

895

# Is this a D-Bus method?

1157

896

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

1158

897

# Create a new, but exactly alike, function

1159

898

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

1160

899

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

1161

900

# to the class.

1162

attr[attrname] = (

1163

dbus.service.method(

1164

alt_interface,

1165

attribute._dbus_in_signature,

1166

attribute._dbus_out_signature)

1167

(types.FunctionType(attribute.func_code,

1168

attribute.func_globals,

1169

attribute.func_name,

1170

attribute.func_defaults,

1171

attribute.func_closure)))

1172

# Copy annotations, if any

1173

try:

1174

attr[attrname]._dbus_annotations = dict(

1175

attribute._dbus_annotations)

1176

except AttributeError:

1177

pass

901

attr[attrname] = (dbus.service.method

902

(alt_interface,

903

attribute._dbus_in_signature,

904

attribute._dbus_out_signature)

905

(types.FunctionType

906

(attribute.func_code,

907

attribute.func_globals,

908

attribute.func_name,

909

attribute.func_defaults,

910

attribute.func_closure)))

1178

911

# Is this a D-Bus property?

1179

912

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

1180

913

# Create a new, but exactly alike, function

1181

914

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

1182

915

# property with the alternate D-Bus interface

1183

916

# name. Add it to the class.

1184

attr[attrname] = (dbus_service_property(

1185

alt_interface, attribute._dbus_signature,

1186

attribute._dbus_access,

1187

attribute._dbus_get_args_options

1188

["byte_arrays"])

1189

(types.FunctionType(

1190

attribute.func_code,

1191

attribute.func_globals,

1192

attribute.func_name,

1193

attribute.func_defaults,

1194

attribute.func_closure)))

1195

# Copy annotations, if any

1196

try:

1197

attr[attrname]._dbus_annotations = dict(

1198

attribute._dbus_annotations)

1199

except AttributeError:

1200

pass

1201

# Is this a D-Bus interface?

1202

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

1203

# Create a new, but exactly alike, function

1204

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

1205

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

1206

# to the class.

1207

attr[attrname] = (

1208

dbus_interface_annotations(alt_interface)

1209

(types.FunctionType(attribute.func_code,

1210

attribute.func_globals,

1211

attribute.func_name,

1212

attribute.func_defaults,

1213

attribute.func_closure)))

1214

if deprecate:

1215

# Deprecate all alternate interfaces

1216

iname="_AlternateDBusNames_interface_annotation{}"

1217

for interface_name in interface_names:

1218

1219

@dbus_interface_annotations(interface_name)

1220

def func(self):

1221

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

1222

"true" }

1223

# Find an unused name

1224

for aname in (iname.format(i)

1225

for i in itertools.count()):

1226

if aname not in attr:

1227

attr[aname] = func

1228

break

1229

if interface_names:

1230

# Replace the class with a new subclass of it with

1231

# methods, signals, etc. as created above.

1232

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

1233

(cls, ), attr)

1234

return cls

1235

1236

return wrapper

1237

1238

1239

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

1240

"se.bsnet.fukt.Mandos"})

917

attr[attrname] = (dbus_service_property

918

(alt_interface,

919

attribute._dbus_signature,

920

attribute._dbus_access,

921

attribute

922

._dbus_get_args_options

923

["byte_arrays"])

924

(types.FunctionType

925

(attribute.func_code,

926

attribute.func_globals,

927

attribute.func_name,

928

attribute.func_defaults,

929

attribute.func_closure)))

930

return type.__new__(mcs, name, bases, attr)

931

1241

932

class ClientDBus(Client, DBusObjectWithProperties):

1242

933

"""A Client class using D-Bus

1243

934

1247

938

"""

1248

939

1249

940

runtime_expansions = (Client.runtime_expansions

1250

+ ("dbus_object_path", ))

1251

1252

_interface = "se.recompile.Mandos.Client"

941

+ ("dbus_object_path",))

1253

942

1254

943

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

1255

944

1256

945

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

1257

946

self.bus = bus

1258

947

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

948

949

self._approvals_pending = 0

1259

950

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

1260

951

# the D-Bus

1261

client_object_name = str(self.name).translate(

952

client_object_name = unicode(self.name).translate(

1262

953

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

1263

954

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

1264

self.dbus_object_path = dbus.ObjectPath(

1265

"/clients/" + client_object_name)

955

self.dbus_object_path = (dbus.ObjectPath

956

("/clients/" + client_object_name))

1266

957

DBusObjectWithProperties.__init__(self, self.bus,

1267

958

self.dbus_object_path)

1268

1269

def notifychangeproperty(transform_func, dbus_name,

1270

type_func=lambda x: x,

1271

variant_level=1,

1272

invalidate_only=False,

1273

_interface=_interface):

959

960

def notifychangeproperty(transform_func,

961

dbus_name, type_func=lambda x: x,

962

variant_level=1):

1274

963

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

1275

964

its changes to DBus.

1276

965

1277

966

transform_fun: Function that takes a value and a variant_level

1278

967

and transforms it to a D-Bus type.

1279

968

dbus_name: D-Bus name of the variable

1281

970

to the D-Bus. Default: no transform

1282

971

variant_level: D-Bus variant level. Default: 1

1283

972

"""

1284

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

1285

973

attrname = "_{0}".format(dbus_name)

1286

974

def setter(self, value):

1287

975

if hasattr(self, "dbus_object_path"):

1288

976

if (not hasattr(self, attrname) or

1289

977

type_func(getattr(self, attrname, None))

1290

978

!= type_func(value)):

1291

if invalidate_only:

1292

self.PropertiesChanged(

1293

_interface, dbus.Dictionary(),

1294

dbus.Array((dbus_name, )))

1295

else:

1296

dbus_value = transform_func(

1297

type_func(value),

1298

variant_level = variant_level)

1299

self.PropertyChanged(dbus.String(dbus_name),

1300

dbus_value)

1301

self.PropertiesChanged(

1302

_interface,

1303

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

1304

dbus_value }),

1305

dbus.Array())

979

dbus_value = transform_func(type_func(value),

980

variant_level

981

=variant_level)

982

self.PropertyChanged(dbus.String(dbus_name),

983

dbus_value)

1306

984

setattr(self, attrname, value)

1307

985

1308

986

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

1309

987

988

1310

989

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1311

990

approvals_pending = notifychangeproperty(dbus.Boolean,

1312

991

"ApprovalPending",

1314

993

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

1315

994

last_enabled = notifychangeproperty(datetime_to_dbus,

1316

995

"LastEnabled")

1317

checker = notifychangeproperty(

1318

dbus.Boolean, "CheckerRunning",

1319

type_func = lambda checker: checker is not None)

996

checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",

997

type_func = lambda checker:

998

checker is not None)

1320

999

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1321

1000

"LastCheckedOK")

1322

last_checker_status = notifychangeproperty(dbus.Int16,

1323

"LastCheckerStatus")

1324

1001

last_approval_request = notifychangeproperty(

1325

1002

datetime_to_dbus, "LastApprovalRequest")

1326

1003

approved_by_default = notifychangeproperty(dbus.Boolean,

1327

1004

"ApprovedByDefault")

1328

approval_delay = notifychangeproperty(

1329

dbus.UInt64, "ApprovalDelay",

1330

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

1005

approval_delay = notifychangeproperty(dbus.UInt16,

1006

"ApprovalDelay",

1007

type_func =

1008

_timedelta_to_milliseconds)

1331

1009

approval_duration = notifychangeproperty(

1332

dbus.UInt64, "ApprovalDuration",

1333

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

1010

dbus.UInt16, "ApprovalDuration",

1011

type_func = _timedelta_to_milliseconds)

1334

1012

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

1335

timeout = notifychangeproperty(

1336

dbus.UInt64, "Timeout",

1337

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

1013

timeout = notifychangeproperty(dbus.UInt16, "Timeout",

1014

type_func =

1015

_timedelta_to_milliseconds)

1338

1016

extended_timeout = notifychangeproperty(

1339

dbus.UInt64, "ExtendedTimeout",

1340

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

1341

interval = notifychangeproperty(

1342

dbus.UInt64, "Interval",

1343

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

1017

dbus.UInt16, "ExtendedTimeout",

1018

type_func = _timedelta_to_milliseconds)

1019

interval = notifychangeproperty(dbus.UInt16,

1020

"Interval",

1021

type_func =

1022

_timedelta_to_milliseconds)

1344

1023

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

1345

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

1346

invalidate_only=True)

1347

1024

1348

1025

del notifychangeproperty

1349

1026

1376

1053

*args, **kwargs)

1377

1054

1378

1055

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

1379

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

1056

old_checker = self.checker

1057

if self.checker is not None:

1058

old_checker_pid = self.checker.pid

1059

else:

1060

old_checker_pid = None

1380

1061

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

1381

1062

# Only if new checker process was started

1382

1063

if (self.checker is not None

1386

1067

return r

1387

1068

1388

1069

def _reset_approved(self):

1389

self.approved = None

1070

self._approved = None

1390

1071

return False

1391

1072

1392

1073

def approve(self, value=True):

1393

self.approved = value

1394

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

1395

* 1000), self._reset_approved)

1396

1074

self.send_changedstate()

1075

self._approved = value

1076

gobject.timeout_add(_timedelta_to_milliseconds

1077

(self.approval_duration),

1078

self._reset_approved)

1079

1397

1080

1398

1081

## D-Bus methods, signals & properties

1399

1400

## Interfaces

1082

_interface = "se.recompile.Mandos.Client"

1401

1083

1402

1084

## Signals

1403

1085

1414

1096

pass

1415

1097

1416

1098

# PropertyChanged - signal

1417

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

1418

1099

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

1419

1100

def PropertyChanged(self, property, value):

1420

1101

"D-Bus signal"

1484

1165

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

1485

1166

1486

1167

# ApprovedByDefault - property

1487

@dbus_service_property(_interface,

1488

signature="b",

1168

@dbus_service_property(_interface, signature="b",

1489

1169

access="readwrite")

1490

1170

def ApprovedByDefault_dbus_property(self, value=None):

1491

1171

if value is None: # get

1493

1173

self.approved_by_default = bool(value)

1494

1174

1495

1175

# ApprovalDelay - property

1496

@dbus_service_property(_interface,

1497

signature="t",

1176

@dbus_service_property(_interface, signature="t",

1498

1177

access="readwrite")

1499

1178

def ApprovalDelay_dbus_property(self, value=None):

1500

1179

if value is None: # get

1501

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

1502

* 1000)

1180

return dbus.UInt64(self.approval_delay_milliseconds())

1503

1181

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

1504

1182

1505

1183

# ApprovalDuration - property

1506

@dbus_service_property(_interface,

1507

signature="t",

1184

@dbus_service_property(_interface, signature="t",

1508

1185

access="readwrite")

1509

1186

def ApprovalDuration_dbus_property(self, value=None):

1510

1187

if value is None: # get

1511

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

1512

* 1000)

1188

return dbus.UInt64(_timedelta_to_milliseconds(

1189

self.approval_duration))

1513

1190

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

1514

1191

1515

1192

# Name - property

1523

1200

return dbus.String(self.fingerprint)

1524

1201

1525

1202

# Host - property

1526

@dbus_service_property(_interface,

1527

signature="s",

1203

@dbus_service_property(_interface, signature="s",

1528

1204

access="readwrite")

1529

1205

def Host_dbus_property(self, value=None):

1530

1206

if value is None: # get

1531

1207

return dbus.String(self.host)

1532

self.host = str(value)

1208

self.host = value

1533

1209

1534

1210

# Created - property

1535

1211

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

1536

1212

def Created_dbus_property(self):

1537

return datetime_to_dbus(self.created)

1213

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

1538

1214

1539

1215

# LastEnabled - property

1540

1216

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

1542

1218

return datetime_to_dbus(self.last_enabled)

1543

1219

1544

1220

# Enabled - property

1545

@dbus_service_property(_interface,

1546

signature="b",

1221

@dbus_service_property(_interface, signature="b",

1547

1222

access="readwrite")

1548

1223

def Enabled_dbus_property(self, value=None):

1549

1224

if value is None: # get

1554

1229

self.disable()

1555

1230

1556

1231

# LastCheckedOK - property

1557

@dbus_service_property(_interface,

1558

signature="s",

1232

@dbus_service_property(_interface, signature="s",

1559

1233

access="readwrite")

1560

1234

def LastCheckedOK_dbus_property(self, value=None):

1561

1235

if value is not None:

1563

1237

return

1564

1238

return datetime_to_dbus(self.last_checked_ok)

1565

1239

1566

# LastCheckerStatus - property

1567

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

1568

def LastCheckerStatus_dbus_property(self):

1569

return dbus.Int16(self.last_checker_status)

1570

1571

1240

# Expires - property

1572

1241

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

1573

1242

def Expires_dbus_property(self):

1579

1248

return datetime_to_dbus(self.last_approval_request)

1580

1249

1581

1250

# Timeout - property

1582

@dbus_service_property(_interface,

1583

signature="t",

1251

@dbus_service_property(_interface, signature="t",

1584

1252

access="readwrite")

1585

1253

def Timeout_dbus_property(self, value=None):

1586

1254

if value is None: # get

1587

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

1588

old_timeout = self.timeout

1255

return dbus.UInt64(self.timeout_milliseconds())

1589

1256

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

1590

# Reschedule disabling

1591

if self.enabled:

1592

now = datetime.datetime.utcnow()

1593

self.expires += self.timeout - old_timeout

1594

if self.expires <= now:

1595

# The timeout has passed

1596

self.disable()

1597

else:

1598

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

1599

is None):

1600

return

1601

gobject.source_remove(self.disable_initiator_tag)

1602

self.disable_initiator_tag = gobject.timeout_add(

1603

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

1604

self.disable)

1257

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

1258

return

1259

# Reschedule timeout

1260

gobject.source_remove(self.disable_initiator_tag)

1261

self.disable_initiator_tag = None

1262

self.expires = None

1263

time_to_die = _timedelta_to_milliseconds((self

1264

.last_checked_ok

1265

+ self.timeout)

1266

- datetime.datetime

1267

.utcnow())

1268

if time_to_die <= 0:

1269

# The timeout has passed

1270

self.disable()

1271

else:

1272

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

1273

+ datetime.timedelta(milliseconds =

1274

time_to_die))

1275

self.disable_initiator_tag = (gobject.timeout_add

1276

(time_to_die, self.disable))

1605

1277

1606

1278

# ExtendedTimeout - property

1607

@dbus_service_property(_interface,

1608

signature="t",

1279

@dbus_service_property(_interface, signature="t",

1609

1280

access="readwrite")

1610

1281

def ExtendedTimeout_dbus_property(self, value=None):

1611

1282

if value is None: # get

1612

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

1613

* 1000)

1283

return dbus.UInt64(self.extended_timeout_milliseconds())

1614

1284

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

1615

1285

1616

1286

# Interval - property

1617

@dbus_service_property(_interface,

1618

signature="t",

1287

@dbus_service_property(_interface, signature="t",

1619

1288

access="readwrite")

1620

1289

def Interval_dbus_property(self, value=None):

1621

1290

if value is None: # get

1622

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

1291

return dbus.UInt64(self.interval_milliseconds())

1623

1292

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

1624

1293

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

1625

1294

return

1626

if self.enabled:

1627

# Reschedule checker run

1628

gobject.source_remove(self.checker_initiator_tag)

1629

self.checker_initiator_tag = gobject.timeout_add(

1630

value, self.start_checker)

1631

self.start_checker() # Start one now, too

1295

# Reschedule checker run

1296

gobject.source_remove(self.checker_initiator_tag)

1297

self.checker_initiator_tag = (gobject.timeout_add

1298

(value, self.start_checker))

1299

self.start_checker() # Start one now, too

1632

1300

1633

1301

# Checker - property

1634

@dbus_service_property(_interface,

1635

signature="s",

1302

@dbus_service_property(_interface, signature="s",

1636

1303

access="readwrite")

1637

1304

def Checker_dbus_property(self, value=None):

1638

1305

if value is None: # get

1639

1306

return dbus.String(self.checker_command)

1640

self.checker_command = str(value)

1307

self.checker_command = value

1641

1308

1642

1309

# CheckerRunning - property

1643

@dbus_service_property(_interface,

1644

signature="b",

1310

@dbus_service_property(_interface, signature="b",

1645

1311

access="readwrite")

1646

1312

def CheckerRunning_dbus_property(self, value=None):

1647

1313

if value is None: # get

1657

1323

return self.dbus_object_path # is already a dbus.ObjectPath

1658

1324

1659

1325

# Secret = property

1660

@dbus_service_property(_interface,

1661

signature="ay",

1662

access="write",

1663

byte_arrays=True)

1326

@dbus_service_property(_interface, signature="ay",

1327

access="write", byte_arrays=True)

1664

1328

def Secret_dbus_property(self, value):

1665

self.secret = bytes(value)

1329

self.secret = str(value)

1666

1330

1667

1331

del _interface

1668

1332

1672

1336

self._pipe = child_pipe

1673

1337

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

1674

1338

if not self._pipe.recv():

1675

raise KeyError(fpr)

1339

raise KeyError()

1676

1340

1677

1341

def __getattribute__(self, name):

1678

if name == '_pipe':

1342

if(name == '_pipe'):

1679

1343

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

1680

1344

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

1681

1345

data = self._pipe.recv()

1682

1346

if data[0] == 'data':

1683

1347

return data[1]

1684

1348

if data[0] == 'function':

1685

1686

1349

def func(*args, **kwargs):

1687

1350

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

1688

1351

return self._pipe.recv()[1]

1689

1690

1352

return func

1691

1353

1692

1354

def __setattr__(self, name, value):

1693

if name == '_pipe':

1355

if(name == '_pipe'):

1694

1356

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

1695

1357

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

1696

1358

1359

class ClientDBusTransitional(ClientDBus):

1360

__metaclass__ = AlternateDBusNamesMetaclass

1697

1361

1698

1362

class ClientHandler(socketserver.BaseRequestHandler, object):

1699

1363

"""A class to handle client connections.

1704

1368

def handle(self):

1705

1369

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

1706

1370

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

1707

str(self.client_address))

1371

unicode(self.client_address))

1708

1372

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

1709

1373

self.server.child_pipe.fileno())

1710

1374

1711

session = gnutls.connection.ClientSession(

1712

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

1375

session = (gnutls.connection

1376

.ClientSession(self.request,

1377

gnutls.connection

1378

.X509Credentials()))

1713

1379

1714

1380

# Note: gnutls.connection.X509Credentials is really a

1715

1381

# generic GnuTLS certificate credentials object so long as

1724

1390

priority = self.server.gnutls_priority

1725

1391

if priority is None:

1726

1392

priority = "NORMAL"

1727

gnutls.library.functions.gnutls_priority_set_direct(

1728

session._c_object, priority, None)

1393

(gnutls.library.functions

1394

.gnutls_priority_set_direct(session._c_object,

1395

priority, None))

1729

1396

1730

1397

# Start communication using the Mandos protocol

1731

1398

# Get protocol number

1733

1400

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

1734

1401

try:

1735

1402

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

1736

raise RuntimeError(line)

1403

raise RuntimeError

1737

1404

except (ValueError, IndexError, RuntimeError) as error:

1738

1405

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

1739

1406

return

1751

1418

approval_required = False

1752

1419

try:

1753

1420

try:

1754

fpr = self.fingerprint(

1755

self.peer_certificate(session))

1421

fpr = self.fingerprint(self.peer_certificate

1422

(session))

1756

1423

except (TypeError,

1757

1424

gnutls.errors.GNUTLSError) as error:

1758

1425

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

1773

1440

while True:

1774

1441

if not client.enabled:

1775

1442

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

1776

client.name)

1443

client.name)

1777

1444

if self.server.use_dbus:

1778

1445

# Emit D-Bus signal

1779

1446

client.Rejected("Disabled")

1780

1447

return

1781

1448

1782

if client.approved or not client.approval_delay:

1449

if client._approved or not client.approval_delay:

1783

1450

#We are approved or approval is disabled

1784

1451

break

1785

elif client.approved is None:

1452

elif client._approved is None:

1786

1453

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

1787

1454

client.name)

1788

1455

if self.server.use_dbus:

1789

1456

# Emit D-Bus signal

1790

1457

client.NeedApproval(

1791

client.approval_delay.total_seconds()

1792

* 1000, client.approved_by_default)

1458

client.approval_delay_milliseconds(),

1459

client.approved_by_default)

1793

1460

else:

1794

1461

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

1795

1462

client.name)

1801

1468

#wait until timeout or approved

1802

1469

time = datetime.datetime.now()

1803

1470

client.changedstate.acquire()

1804

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

1471

(client.changedstate.wait

1472

(float(client._timedelta_to_milliseconds(delay)

1473

/ 1000)))

1805

1474

client.changedstate.release()

1806

1475

time2 = datetime.datetime.now()

1807

1476

if (time2 - time) >= delay:

1823

1492

try:

1824

1493

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

1825

1494

except gnutls.errors.GNUTLSError as error:

1826

logger.warning("gnutls send failed",

1827

exc_info=error)

1495

logger.warning("gnutls send failed")

1828

1496

return

1829

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

1830

len(client.secret) - (sent_size

1831

+ sent))

1497

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

1498

sent, len(client.secret)

1499

- (sent_size + sent))

1832

1500

sent_size += sent

1833

1501

1834

1502

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

1835

1503

# bump the timeout using extended_timeout

1836

client.bump_timeout(client.extended_timeout)

1504

client.checked_ok(client.extended_timeout)

1837

1505

if self.server.use_dbus:

1838

1506

# Emit D-Bus signal

1839

1507

client.GotSecret()

1844

1512

try:

1845

1513

session.bye()

1846

1514

except gnutls.errors.GNUTLSError as error:

1847

logger.warning("GnuTLS bye failed",

1848

exc_info=error)

1515

logger.warning("GnuTLS bye failed")

1849

1516

1850

1517

@staticmethod

1851

1518

def peer_certificate(session):

1852

1519

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

1853

1520

# If not an OpenPGP certificate...

1854

if (gnutls.library.functions.gnutls_certificate_type_get(

1855

session._c_object)

1521

if (gnutls.library.functions

1522

.gnutls_certificate_type_get(session._c_object)

1856

1523

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

1857

1524

# ...do the normal thing

1858

1525

return session.peer_certificate

1872

1539

def fingerprint(openpgp):

1873

1540

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

1874

1541

# New GnuTLS "datum" with the OpenPGP public key

1875

datum = gnutls.library.types.gnutls_datum_t(

1876

ctypes.cast(ctypes.c_char_p(openpgp),

1877

ctypes.POINTER(ctypes.c_ubyte)),

1878

ctypes.c_uint(len(openpgp)))

1542

datum = (gnutls.library.types

1543

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

1544

ctypes.POINTER

1545

(ctypes.c_ubyte)),

1546

ctypes.c_uint(len(openpgp))))

1879

1547

# New empty GnuTLS certificate

1880

1548

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1881

gnutls.library.functions.gnutls_openpgp_crt_init(

1882

ctypes.byref(crt))

1549

(gnutls.library.functions

1550

.gnutls_openpgp_crt_init(ctypes.byref(crt)))

1883

1551

# Import the OpenPGP public key into the certificate

1884

gnutls.library.functions.gnutls_openpgp_crt_import(

1885

crt, ctypes.byref(datum),

1886

gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)

1552

(gnutls.library.functions

1553

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

1554

gnutls.library.constants

1555

.GNUTLS_OPENPGP_FMT_RAW))

1887

1556

# Verify the self signature in the key

1888

1557

crtverify = ctypes.c_uint()

1889

gnutls.library.functions.gnutls_openpgp_crt_verify_self(

1890

crt, 0, ctypes.byref(crtverify))

1558

(gnutls.library.functions

1559

.gnutls_openpgp_crt_verify_self(crt, 0,

1560

ctypes.byref(crtverify)))

1891

1561

if crtverify.value != 0:

1892

1562

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1893

raise gnutls.errors.CertificateSecurityError(

1894

"Verify failed")

1563

raise (gnutls.errors.CertificateSecurityError

1564

("Verify failed"))

1895

1565

# New buffer for the fingerprint

1896

1566

buf = ctypes.create_string_buffer(20)

1897

1567

buf_len = ctypes.c_size_t()

1898

1568

# Get the fingerprint from the certificate into the buffer

1899

gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint(

1900

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

1569

(gnutls.library.functions

1570

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

1571

ctypes.byref(buf_len)))

1901

1572

# Deinit the certificate

1902

1573

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1903

1574

# Convert the buffer to a Python bytestring

1904

1575

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

1905

1576

# Convert the bytestring to hexadecimal notation

1906

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

1577

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

1907

1578

return hex_fpr

1908

1579

1909

1580

1910

1581

class MultiprocessingMixIn(object):

1911

1582

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

1912

1913

1583

def sub_process_main(self, request, address):

1914

1584

try:

1915

1585

self.finish_request(request, address)

1916

except Exception:

1586

except:

1917

1587

self.handle_error(request, address)

1918

1588

self.close_request(request)

1919

1589

1920

1590

def process_request(self, request, address):

1921

1591

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

1922

1592

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

1923

args = (request, address))

1593

args = (request,

1594

address))

1924

1595

proc.start()

1925

1596

return proc

1926

1597

1927

1598

1928

1599

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1929

1600

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

1930

1931

1601

def process_request(self, request, client_address):

1932

1602

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

1933

1603

1942

1612

1943

1613

def add_pipe(self, parent_pipe, proc):

1944

1614

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

1945

raise NotImplementedError()

1615

raise NotImplementedError

1946

1616

1947

1617

1948

1618

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1954

1624

interface: None or a network interface name (string)

1955

1625

use_ipv6: Boolean; to use IPv6 or not

1956

1626

"""

1957

1958

1627

def __init__(self, server_address, RequestHandlerClass,

1959

interface=None,

1960

use_ipv6=True,

1961

socketfd=None):

1962

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

1963

creating a new one with socket.socket().

1964

"""

1628

interface=None, use_ipv6=True):

1965

1629

self.interface = interface

1966

1630

if use_ipv6:

1967

1631

self.address_family = socket.AF_INET6

1968

if socketfd is not None:

1969

# Save the file descriptor

1970

self.socketfd = socketfd

1971

# Save the original socket.socket() function

1972

self.socket_socket = socket.socket

1973

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

1974

#

1975

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

1976

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

1977

# patching socket.socket.)

1978

#

1979

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

1980

@functools.wraps(socket.socket)

1981

def socket_wrapper(*args, **kwargs):

1982

# Restore original function so subsequent calls are

1983

# not affected.

1984

socket.socket = self.socket_socket

1985

del self.socket_socket

1986

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

1987

# saved file descriptor.

1988

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

1989

# Replace socket.socket() function with wrapper

1990

socket.socket = socket_wrapper

1991

# The socketserver.TCPServer.__init__ will call

1992

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

1993

# socket_wrapper(), if socketfd was set.

1994

1632

socketserver.TCPServer.__init__(self, server_address,

1995

1633

RequestHandlerClass)

1996

1997

1634

def server_bind(self):

1998

1635

"""This overrides the normal server_bind() function

1999

1636

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

2005

1642

self.interface)

2006

1643

else:

2007

1644

try:

2008

self.socket.setsockopt(

2009

socket.SOL_SOCKET, SO_BINDTODEVICE,

2010

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

1645

self.socket.setsockopt(socket.SOL_SOCKET,

1646

SO_BINDTODEVICE,

1647

str(self.interface

1648

+ '\0'))

2011

1649

except socket.error as error:

2012

if error.errno == errno.EPERM:

2013

logger.error("No permission to bind to"

2014

" interface %s", self.interface)

2015

elif error.errno == errno.ENOPROTOOPT:

1650

if error[0] == errno.EPERM:

1651

logger.error("No permission to"

1652

" bind to interface %s",

1653

self.interface)

1654

elif error[0] == errno.ENOPROTOOPT:

2016

1655

logger.error("SO_BINDTODEVICE not available;"

2017

1656

" cannot bind to interface %s",

2018

1657

self.interface)

2019

elif error.errno == errno.ENODEV:

2020

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

2021

" cannot bind", self.interface)

2022

1658

else:

2023

1659

raise

2024

1660

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

2027

1663

if self.address_family == socket.AF_INET6:

2028

1664

any_address = "::" # in6addr_any

2029

1665

else:

2030

any_address = "0.0.0.0" # INADDR_ANY

1666

any_address = socket.INADDR_ANY

2031

1667

self.server_address = (any_address,

2032

1668

self.server_address[1])

2033

1669

elif not self.server_address[1]:

2034

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

1670

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

1671

0)

2035

1672

# if self.interface:

2036

1673

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

2037

1674

# 0, # port

2051

1688

2052

1689

Assumes a gobject.MainLoop event loop.

2053

1690

"""

2054

2055

1691

def __init__(self, server_address, RequestHandlerClass,

2056

interface=None,

2057

use_ipv6=True,

2058

clients=None,

2059

gnutls_priority=None,

2060

use_dbus=True,

2061

socketfd=None):

1692

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

1693

gnutls_priority=None, use_dbus=True):

2062

1694

self.enabled = False

2063

1695

self.clients = clients

2064

1696

if self.clients is None:

2068

1700

IPv6_TCPServer.__init__(self, server_address,

2069

1701

RequestHandlerClass,

2070

1702

interface = interface,

2071

use_ipv6 = use_ipv6,

2072

socketfd = socketfd)

2073

1703

use_ipv6 = use_ipv6)

2074

1704

def server_activate(self):

2075

1705

if self.enabled:

2076

1706

return socketserver.TCPServer.server_activate(self)

2080

1710

2081

1711

def add_pipe(self, parent_pipe, proc):

2082

1712

# Call "handle_ipc" for both data and EOF events

2083

gobject.io_add_watch(

2084

parent_pipe.fileno(),

2085

gobject.IO_IN | gobject.IO_HUP,

2086

functools.partial(self.handle_ipc,

2087

parent_pipe = parent_pipe,

2088

proc = proc))

1713

gobject.io_add_watch(parent_pipe.fileno(),

1714

gobject.IO_IN | gobject.IO_HUP,

1715

functools.partial(self.handle_ipc,

1716

parent_pipe =

1717

parent_pipe,

1718

proc = proc))

2089

1719

2090

def handle_ipc(self, source, condition,

2091

parent_pipe=None,

2092

proc = None,

2093

client_object=None):

1720

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

1721

proc = None, client_object=None):

1722

condition_names = {

1723

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

1724

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

1725

# blocking).

1726

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

1727

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

1728

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

1729

# broken, usually for pipes and

1730

# sockets).

1731

}

1732

conditions_string = ' | '.join(name

1733

for cond, name in

1734

condition_names.iteritems()

1735

if cond & condition)

2094

1736

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

2095

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

1737

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

2096

1738

# Wait for other process to exit

2097

1739

proc.join()

2098

1740

return False

2119

1761

parent_pipe.send(False)

2120

1762

return False

2121

1763

2122

gobject.io_add_watch(

2123

parent_pipe.fileno(),

2124

gobject.IO_IN | gobject.IO_HUP,

2125

functools.partial(self.handle_ipc,

2126

parent_pipe = parent_pipe,

2127

proc = proc,

2128

client_object = client))

1764

gobject.io_add_watch(parent_pipe.fileno(),

1765

gobject.IO_IN | gobject.IO_HUP,

1766

functools.partial(self.handle_ipc,

1767

parent_pipe =

1768

parent_pipe,

1769

proc = proc,

1770

client_object =

1771

client))

2129

1772

parent_pipe.send(True)

2130

1773

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

2131

1774

# same fileno

2137

1780

2138

1781

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

2139

1782

funcname)(*args,

2140

**kwargs)))

1783

**kwargs)))

2141

1784

2142

1785

if command == 'getattr':

2143

1786

attrname = request[1]

2144

1787

if callable(client_object.__getattribute__(attrname)):

2145

parent_pipe.send(('function', ))

1788

parent_pipe.send(('function',))

2146

1789

else:

2147

parent_pipe.send((

2148

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

1790

parent_pipe.send(('data', client_object

1791

.__getattribute__(attrname)))

2149

1792

2150

1793

if command == 'setattr':

2151

1794

attrname = request[1]

2155

1798

return True

2156

1799

2157

1800

2158

def rfc3339_duration_to_delta(duration):

2159

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

2160

2161

>>> rfc3339_duration_to_delta("P7D")

2162

datetime.timedelta(7)

2163

>>> rfc3339_duration_to_delta("PT60S")

2164

datetime.timedelta(0, 60)

2165

>>> rfc3339_duration_to_delta("PT60M")

2166

datetime.timedelta(0, 3600)

2167

>>> rfc3339_duration_to_delta("PT24H")

2168

datetime.timedelta(1)

2169

>>> rfc3339_duration_to_delta("P1W")

2170

datetime.timedelta(7)

2171

>>> rfc3339_duration_to_delta("PT5M30S")

2172

datetime.timedelta(0, 330)

2173

>>> rfc3339_duration_to_delta("P1DT3M20S")

2174

datetime.timedelta(1, 200)

2175

"""

2176

2177

# Parsing an RFC 3339 duration with regular expressions is not

2178

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

2179

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

2180

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

2181

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

2182

# avoid excessive use of external libraries.

2183

2184

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

2185

Token = collections.namedtuple("Token",

2186

("regexp", # To match token; if

2187

# "value" is not None,

2188

# must have a "group"

2189

# containing digits

2190

"value", # datetime.timedelta or

2191

# None

2192

"followers")) # Tokens valid after

2193

# this token

2194

Token = collections.namedtuple("Token", (

2195

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

2196

# a "group" containing digits

2197

"value", # datetime.timedelta or None

2198

"followers")) # Tokens valid after this token

2199

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

2200

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

2201

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

2202

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

2203

datetime.timedelta(seconds=1),

2204

frozenset((token_end, )))

2205

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

2206

datetime.timedelta(minutes=1),

2207

frozenset((token_second, token_end)))

2208

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

2209

datetime.timedelta(hours=1),

2210

frozenset((token_minute, token_end)))

2211

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

2212

None,

2213

frozenset((token_hour, token_minute,

2214

token_second)))

2215

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

2216

datetime.timedelta(days=1),

2217

frozenset((token_time, token_end)))

2218

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

2219

datetime.timedelta(weeks=4),

2220

frozenset((token_day, token_end)))

2221

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

2222

datetime.timedelta(weeks=52),

2223

frozenset((token_month, token_end)))

2224

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

2225

datetime.timedelta(weeks=1),

2226

frozenset((token_end, )))

2227

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

2228

frozenset((token_year, token_month,

2229

token_day, token_time,

2230

token_week)))

2231

# Define starting values

2232

value = datetime.timedelta() # Value so far

2233

found_token = None

2234

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

2235

s = duration # String left to parse

2236

# Loop until end token is found

2237

while found_token is not token_end:

2238

# Search for any currently valid tokens

2239

for token in followers:

2240

match = token.regexp.match(s)

2241

if match is not None:

2242

# Token found

2243

if token.value is not None:

2244

# Value found, parse digits

2245

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

2246

# Add to value so far

2247

value += factor * token.value

2248

# Strip token from string

2249

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

2250

# Go to found token

2251

found_token = token

2252

# Set valid next tokens

2253

followers = found_token.followers

2254

break

2255

else:

2256

# No currently valid tokens were found

2257

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

2258

.format(duration))

2259

# End token found

2260

return value

2261

2262

2263

1801

def string_to_delta(interval):

2264

1802

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

2265

1803

2276

1814

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

2277

1815

datetime.timedelta(0, 330)

2278

1816

"""

2279

2280

try:

2281

return rfc3339_duration_to_delta(interval)

2282

except ValueError:

2283

pass

2284

2285

1817

timevalue = datetime.timedelta(0)

2286

1818

for s in interval.split():

2287

1819

try:

2288

suffix = s[-1]

1820

suffix = unicode(s[-1])

2289

1821

value = int(s[:-1])

2290

1822

if suffix == "d":

2291

1823

delta = datetime.timedelta(value)

2298

1830

elif suffix == "w":

2299

1831

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

2300

1832

else:

2301

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

2302

except IndexError as e:

1833

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

1834

except (ValueError, IndexError) as e:

2303

1835

raise ValueError(*(e.args))

2304

1836

timevalue += delta

2305

1837

return timevalue

2306

1838

2307

1839

1840

def if_nametoindex(interface):

1841

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

1842

1843

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

1844

global if_nametoindex

1845

try:

1846

if_nametoindex = (ctypes.cdll.LoadLibrary

1847

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

1848

.if_nametoindex)

1849

except (OSError, AttributeError):

1850

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

1851

def if_nametoindex(interface):

1852

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

1853

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

1854

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

1855

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1856

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

1857

interface))

1858

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

1859

ifreq[16:20])[0]

1860

return interface_index

1861

return if_nametoindex(interface)

1862

1863

2308

1864

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

2309

1865

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

2310

1866

2318

1874

sys.exit()

2319

1875

if not noclose:

2320

1876

# Close all standard open file descriptors

2321

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

1877

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

2322

1878

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

2323

1879

raise OSError(errno.ENODEV,

2324

"{} not a character device"

2325

.format(os.devnull))

1880

"%s not a character device"

1881

% os.path.devnull)

2326

1882

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

2327

1883

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

2328

1884

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

2337

1893

2338

1894

parser = argparse.ArgumentParser()

2339

1895

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

2340

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

1896

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

2341

1897

help="show version number and exit")

2342

1898

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

2343

1899

help="Bind to interface IF")

2349

1905

help="Run self-test")

2350

1906

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

2351

1907

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

2352

" to terminal", default=None)

1908

" to terminal")

2353

1909

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

2354

1910

help="Debug level for stdout output")

2355

1911

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

2362

1918

" files")

2363

1919

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

2364

1920

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

2365

" system bus interface", default=None)

1921

" system bus interface")

2366

1922

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

2367

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

2368

default=None)

1923

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

2369

1924

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

2370

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

2371

" state", default=None)

2372

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

2373

help="Specify a file descriptor to a network"

2374

" socket to use instead of creating one")

2375

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

2376

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

2377

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

2378

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

2379

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

2380

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

2381

default=None)

2382

1925

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

1926

default=True)

1927

2383

1928

options = parser.parse_args()

2384

1929

2385

1930

if options.check:

2386

1931

import doctest

2387

fail_count, test_count = doctest.testmod()

2388

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

1932

doctest.testmod()

1933

sys.exit()

2389

1934

2390

1935

# Default values for config file for server-global settings

2391

1936

server_defaults = { "interface": "",

2393

1938

"port": "",

2394

1939

"debug": "False",

2395

1940

"priority":

2396

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

2397

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

1941

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

2398

1942

"servicename": "Mandos",

2399

1943

"use_dbus": "True",

2400

1944

"use_ipv6": "True",

2401

1945

"debuglevel": "",

2402

"restore": "True",

2403

"socket": "",

2404

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

2405

"foreground": "False",

2406

"zeroconf": "True",

2407

}

1946

}

2408

1947

2409

1948

# Parse config file for server-global settings

2410

1949

server_config = configparser.SafeConfigParser(server_defaults)

2411

1950

del server_defaults

2412

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

1951

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

1952

"mandos.conf"))

2413

1953

# Convert the SafeConfigParser object to a dict

2414

1954

server_settings = server_config.defaults()

2415

1955

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

2416

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

1956

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

2417

1957

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

2418

1958

option)

2419

1959

if server_settings["port"]:

2420

1960

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

2421

1961

"port")

2422

if server_settings["socket"]:

2423

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

2424

"socket")

2425

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

2426

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

2427

# happen with a supplied network socket.

2428

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

2429

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

2430

["socket"])

2431

1962

del server_config

2432

1963

2433

1964

# Override the settings from the config file with command line

2434

1965

# options, if set.

2435

1966

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

2436

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

2437

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

2438

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

1967

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

1968

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

2439

1969

value = getattr(options, option)

2440

1970

if value is not None:

2441

1971

server_settings[option] = value

2442

1972

del options

2443

1973

# Force all strings to be unicode

2444

1974

for option in server_settings.keys():

2445

if isinstance(server_settings[option], bytes):

2446

server_settings[option] = (server_settings[option]

2447

.decode("utf-8"))

2448

# Force all boolean options to be boolean

2449

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

2450

"foreground", "zeroconf"):

2451

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

2452

# Debug implies foreground

2453

if server_settings["debug"]:

2454

server_settings["foreground"] = True

1975

if type(server_settings[option]) is str:

1976

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

2455

1977

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

2456

1978

2457

1979

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

2458

1980

2459

if (not server_settings["zeroconf"]

2460

and not (server_settings["port"]

2461

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

2462

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

2463

2464

1981

# For convenience

2465

1982

debug = server_settings["debug"]

2466

1983

debuglevel = server_settings["debuglevel"]

2467

1984

use_dbus = server_settings["use_dbus"]

2468

1985

use_ipv6 = server_settings["use_ipv6"]

2469

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

2470

stored_state_file)

2471

foreground = server_settings["foreground"]

2472

zeroconf = server_settings["zeroconf"]

2473

2474

if debug:

2475

initlogger(debug, logging.DEBUG)

2476

else:

2477

if not debuglevel:

2478

initlogger(debug)

2479

else:

2480

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

2481

initlogger(debug, level)

2482

1986

2483

1987

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

2484

syslogger.setFormatter(

2485

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

2486

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

2487

server_settings["servicename"])))

1988

syslogger.setFormatter(logging.Formatter

1989

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

1990

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

1991

% server_settings["servicename"]))

2488

1992

2489

1993

# Parse config file with clients

2490

client_config = configparser.SafeConfigParser(Client

2491

.client_defaults)

1994

client_defaults = { "timeout": "5m",

1995

"extended_timeout": "15m",

1996

"interval": "2m",

1997

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

1998

"host": "",

1999

"approval_delay": "0s",

2000

"approval_duration": "1s",

2001

}

2002

client_config = configparser.SafeConfigParser(client_defaults)

2492

2003

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

2493

2004

"clients.conf"))

2494

2005

2495

2006

global mandos_dbus_service

2496

2007

mandos_dbus_service = None

2497

2008

2498

socketfd = None

2499

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

2500

socketfd = server_settings["socket"]

2501

tcp_server = MandosServer(

2502

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

2503

ClientHandler,

2504

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

2505

use_ipv6=use_ipv6,

2506

gnutls_priority=server_settings["priority"],

2507

use_dbus=use_dbus,

2508

socketfd=socketfd)

2509

if not foreground:

2510

pidfilename = "/run/mandos.pid"

2511

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

2512

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

2513

pidfile = None

2009

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

2010

server_settings["port"]),

2011

ClientHandler,

2012

interface=(server_settings["interface"]

2013

or None),

2014

use_ipv6=use_ipv6,

2015

gnutls_priority=

2016

server_settings["priority"],

2017

use_dbus=use_dbus)

2018

if not debug:

2019

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

2514

2020

try:

2515

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

2516

except IOError as e:

2517

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

2518

exc_info=e)

2021

pidfile = open(pidfilename, "w")

2022

except IOError:

2023

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

2519

2024

2520

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

2025

try:

2026

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

2027

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

2028

except KeyError:

2521

2029

try:

2522

uid = pwd.getpwnam(name).pw_uid

2523

gid = pwd.getpwnam(name).pw_gid

2524

break

2030

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

2031

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

2525

2032

except KeyError:

2526

continue

2527

else:

2528

uid = 65534

2529

gid = 65534

2033

try:

2034

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

2035

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

2036

except KeyError:

2037

uid = 65534

2038

gid = 65534

2530

2039

try:

2531

2040

os.setgid(gid)

2532

2041

os.setuid(uid)

2533

2042

except OSError as error:

2534

if error.errno != errno.EPERM:

2535

raise

2043

if error[0] != errno.EPERM:

2044

raise error

2045

2046

if not debug and not debuglevel:

2047

logger.setLevel(logging.WARNING)

2048

if debuglevel:

2049

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

2050

logger.setLevel(level)

2536

2051

2537

2052

if debug:

2053

logger.setLevel(logging.DEBUG)

2538

2054

# Enable all possible GnuTLS debugging

2539

2055

2540

2056

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

2545

2061

def debug_gnutls(level, string):

2546

2062

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

2547

2063

2548

gnutls.library.functions.gnutls_global_set_log_function(

2549

debug_gnutls)

2064

(gnutls.library.functions

2065

.gnutls_global_set_log_function(debug_gnutls))

2550

2066

2551

2067

# Redirect stdin so all checkers get /dev/null

2552

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

2068

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

2553

2069

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

2554

2070

if null > 2:

2555

2071

os.close(null)

2072

else:

2073

# No console logging

2074

logger.removeHandler(console)

2556

2075

2557

2076

# Need to fork before connecting to D-Bus

2558

if not foreground:

2077

if not debug:

2559

2078

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

2560

2079

daemon()

2561

2080

2562

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

2563

# need to inform gobject that threads will be used.

2564

gobject.threads_init()

2565

2566

2081

global main_loop

2567

2082

# From the Avahi example code

2568

DBusGMainLoop(set_as_default=True)

2083

DBusGMainLoop(set_as_default=True )

2569

2084

main_loop = gobject.MainLoop()

2570

2085

bus = dbus.SystemBus()

2571

2086

# End of Avahi example code

2572

2087

if use_dbus:

2573

2088

try:

2574

2089

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

2575

bus,

2576

do_not_queue=True)

2577

old_bus_name = dbus.service.BusName(

2578

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

2579

do_not_queue=True)

2580

except dbus.exceptions.DBusException as e:

2581

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

2090

bus, do_not_queue=True)

2091

old_bus_name = (dbus.service.BusName

2092

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

2093

do_not_queue=True))

2094

except dbus.exceptions.NameExistsException as e:

2095

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

2582

2096

use_dbus = False

2583

2097

server_settings["use_dbus"] = False

2584

2098

tcp_server.use_dbus = False

2585

if zeroconf:

2586

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2587

service = AvahiServiceToSyslog(

2588

name = server_settings["servicename"],

2589

servicetype = "_mandos._tcp",

2590

protocol = protocol,

2591

bus = bus)

2592

if server_settings["interface"]:

2593

service.interface = if_nametoindex(

2594

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

2099

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2100

service = AvahiServiceToSyslog(name =

2101

server_settings["servicename"],

2102

servicetype = "_mandos._tcp",

2103

protocol = protocol, bus = bus)

2104

if server_settings["interface"]:

2105

service.interface = (if_nametoindex

2106

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

2595

2107

2596

2108

global multiprocessing_manager

2597

2109

multiprocessing_manager = multiprocessing.Manager()

2598

2110

2599

2111

client_class = Client

2600

2112

if use_dbus:

2601

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

2602

2603

client_settings = Client.config_parser(client_config)

2113

client_class = functools.partial(ClientDBusTransitional,

2114

bus = bus)

2115

2116

special_settings = {

2117

# Some settings need to be accessd by special methods;

2118

# booleans need .getboolean(), etc. Here is a list of them:

2119

"approved_by_default":

2120

lambda section:

2121

client_config.getboolean(section, "approved_by_default"),

2122

}

2123

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

2124

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

2125

# with exceptions for any special settings as defined above

2126

client_settings = dict((clientname,

2127

dict((setting,

2128

(value if setting not in special_settings

2129

else special_settings[setting](clientname)))

2130

for setting, value in client_config.items(clientname)))

2131

for clientname in client_config.sections())

2132

2604

2133

old_client_settings = {}

2605

clients_data = {}

2606

2607

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

2608

global wnull

2609

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

2610

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

2611

# mode

2612

if debug or not foreground:

2613

wnull.close()

2614

2615

# Get client data and settings from last running state.

2134

clients_data = []

2135

2136

# Get client data and settings from last running state.

2616

2137

if server_settings["restore"]:

2617

2138

try:

2618

2139

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

2619

clients_data, old_client_settings = pickle.load(

2620

stored_state)

2140

clients_data, old_client_settings = pickle.load(stored_state)

2621

2141

os.remove(stored_state_path)

2622

2142

except IOError as e:

2623

if e.errno == errno.ENOENT:

2624

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

2625

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

2626

else:

2627

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

2628

exc_info=e)

2143

logger.warning("Could not load persistant state: {0}".format(e))

2144

if e.errno != errno.ENOENT:

2629

2145

raise

2630

except EOFError as e:

2631

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

2632

"EOFError:",

2633

exc_info=e)

2634

2635

with PGPEngine() as pgp:

2636

for client_name, client in clients_data.items():

2637

# Skip removed clients

2638

if client_name not in client_settings:

2639

continue

2640

2641

# Decide which value to use after restoring saved state.

2642

# We have three different values: Old config file,

2643

# new config file, and saved state.

2644

# New config value takes precedence if it differs from old

2645

# config value, otherwise use saved state.

2646

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

2647

try:

2648

# For each value in new config, check if it

2649

# differs from the old config value (Except for

2650

# the "secret" attribute)

2651

if (name != "secret"

2652

and (value !=

2653

old_client_settings[client_name][name])):

2654

client[name] = value

2655

except KeyError:

2656

pass

2657

2658

# Clients who has passed its expire date can still be

2659

# enabled if its last checker was successful. Clients

2660

# whose checker succeeded before we stored its state is

2661

# assumed to have successfully run all checkers during

2662

# downtime.

2663

if client["enabled"]:

2664

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

2665

if not client["last_checked_ok"]:

2666

logger.warning(

2667

"disabling client {} - Client never "

2668

"performed a successful checker".format(

2669

client_name))

2670

client["enabled"] = False

2671

elif client["last_checker_status"] != 0:

2672

logger.warning(

2673

"disabling client {} - Client last"

2674

" checker failed with error code"

2675

" {}".format(

2676

client_name,

2677

client["last_checker_status"]))

2678

client["enabled"] = False

2679

else:

2680

client["expires"] = (

2681

datetime.datetime.utcnow()

2682

+ client["timeout"])

2683

logger.debug("Last checker succeeded,"

2684

" keeping {} enabled".format(

2685

client_name))

2146

2147

for client in clients_data:

2148

client_name = client["name"]

2149

2150

# Decide which value to use after restoring saved state.

2151

# We have three different values: Old config file,

2152

# new config file, and saved state.

2153

# New config value takes precedence if it differs from old

2154

# config value, otherwise use saved state.

2155

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

2686

2156

try:

2687

client["secret"] = pgp.decrypt(

2688

client["encrypted_secret"],

2689

client_settings[client_name]["secret"])

2690

except PGPError:

2691

# If decryption fails, we use secret from new settings

2692

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

2693

client_name))

2694

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

2695

["secret"])

2696

2697

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

2698

for client_name in (set(old_client_settings)

2699

- set(client_settings)):

2700

del clients_data[client_name]

2701

for client_name in (set(client_settings)

2702

- set(old_client_settings)):

2703

clients_data[client_name] = client_settings[client_name]

2704

2705

# Create all client objects

2706

for client_name, client in clients_data.items():

2707

tcp_server.clients[client_name] = client_class(

2708

name = client_name,

2709

settings = client,

2710

server_settings = server_settings)

2711

2157

# For each value in new config, check if it differs

2158

# from the old config value (Except for the "secret"

2159

# attribute)

2160

if name != "secret" and value != old_client_settings[client_name][name]:

2161

setattr(client, name, value)

2162

except KeyError:

2163

pass

2164

2165

# Clients who has passed its expire date, can still be enabled if its

2166

# last checker was sucessful. Clients who checkers failed before we

2167

# stored it state is asumed to had failed checker during downtime.

2168

if client["enabled"] and client["last_checked_ok"]:

2169

if ((datetime.datetime.utcnow() - client["last_checked_ok"])

2170

> client["interval"]):

2171

if client["last_checker_status"] != 0:

2172

client["enabled"] = False

2173

else:

2174

client["expires"] = datetime.datetime.utcnow() + client["timeout"]

2175

2176

client["changedstate"] = (multiprocessing_manager

2177

.Condition(multiprocessing_manager

2178

.Lock()))

2179

if use_dbus:

2180

new_client = ClientDBusTransitional.__new__(ClientDBusTransitional)

2181

tcp_server.clients[client_name] = new_client

2182

new_client.bus = bus

2183

for name, value in client.iteritems():

2184

setattr(new_client, name, value)

2185

client_object_name = unicode(client_name).translate(

2186

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

2187

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

2188

new_client.dbus_object_path = (dbus.ObjectPath

2189

("/clients/" + client_object_name))

2190

DBusObjectWithProperties.__init__(new_client,

2191

new_client.bus,

2192

new_client.dbus_object_path)

2193

else:

2194

tcp_server.clients[client_name] = Client.__new__(Client)

2195

for name, value in client.iteritems():

2196

setattr(tcp_server.clients[client_name], name, value)

2197

2198

tcp_server.clients[client_name].decrypt_secret(

2199

client_settings[client_name]["secret"])

2200

2201

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

2202

for clientname in set(old_client_settings) - set(client_settings):

2203

del tcp_server.clients[clientname]

2204

for clientname in set(client_settings) - set(old_client_settings):

2205

tcp_server.clients[clientname] = (client_class(name = clientname,

2206

config =

2207

client_settings

2208

[clientname]))

2209

2210

2712

2211

if not tcp_server.clients:

2713

2212

logger.warning("No clients defined")

2714

2715

if not foreground:

2716

if pidfile is not None:

2717

pid = os.getpid()

2718

try:

2719

with pidfile:

2720

print(pid, file=pidfile)

2721

except IOError:

2722

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

2723

pidfilename, pid)

2724

del pidfile

2213

2214

if not debug:

2215

try:

2216

with pidfile:

2217

pid = os.getpid()

2218

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

2219

del pidfile

2220

except IOError:

2221

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

2222

pidfilename, pid)

2223

except NameError:

2224

# "pidfile" was never created

2225

pass

2725

2226

del pidfilename

2227

2228

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

2726

2229

2727

2230

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

2728

2231

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

2729

2232

2730

2233

if use_dbus:

2731

2732

@alternate_dbus_interfaces(

2733

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

2734

class MandosDBusService(DBusObjectWithProperties):

2234

class MandosDBusService(dbus.service.Object):

2735

2235

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

2736

2737

2236

def __init__(self):

2738

2237

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

2739

2740

2238

_interface = "se.recompile.Mandos"

2741

2239

2742

@dbus_interface_annotations(_interface)

2743

def _foo(self):

2744

return {

2745

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

2746

"false" }

2747

2748

2240

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

2749

2241

def ClientAdded(self, objpath):

2750

2242

"D-Bus signal"

2763

2255

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

2764

2256

def GetAllClients(self):

2765

2257

"D-Bus method"

2766

return dbus.Array(c.dbus_object_path for c in

2258

return dbus.Array(c.dbus_object_path

2259

for c in

2767

2260

tcp_server.clients.itervalues())

2768

2261

2769

2262

@dbus.service.method(_interface,

2771

2264

def GetAllClientsWithProperties(self):

2772

2265

"D-Bus method"

2773

2266

return dbus.Dictionary(

2774

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

2775

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

2267

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

2268

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

2776

2269

signature="oa{sv}")

2777

2270

2778

2271

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

2791

2284

2792

2285

del _interface

2793

2286

2794

mandos_dbus_service = MandosDBusService()

2287

class MandosDBusServiceTransitional(MandosDBusService):

2288

__metaclass__ = AlternateDBusNamesMetaclass

2289

mandos_dbus_service = MandosDBusServiceTransitional()

2795

2290

2796

2291

def cleanup():

2797

2292

"Cleanup function; run on exit"

2798

if zeroconf:

2799

service.cleanup()

2293

service.cleanup()

2800

2294

2801

2295

multiprocessing.active_children()

2802

wnull.close()

2803

2296

if not (tcp_server.clients or client_settings):

2804

2297

return

2805

2806

# Store client before exiting. Secrets are encrypted with key

2807

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

2808

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

2809

clients = {}

2810

with PGPEngine() as pgp:

2811

for client in tcp_server.clients.itervalues():

2812

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

2813

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

2814

key)

2815

client_dict = {}

2816

2817

# A list of attributes that can not be pickled

2818

# + secret.

2819

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

2820

"checker", "server_settings" }

2821

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

2822

.Object):

2823

exclude.add(name)

2824

2825

client_dict["encrypted_secret"] = (client

2826

.encrypted_secret)

2827

for attr in client.client_structure:

2828

if attr not in exclude:

2829

client_dict[attr] = getattr(client, attr)

2830

2831

clients[client.name] = client_dict

2832

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

2833

2298

2299

# Store client before exiting. Secrets are encrypted with key based

2300

# on what config file has. If config file is removed/edited, old

2301

# secret will thus be unrecovable.

2302

clients = []

2303

for client in tcp_server.clients.itervalues():

2304

client.encrypt_secret(client_settings[client.name]["secret"])

2305

2306

client_dict = {}

2307

2308

# A list of attributes that will not be stored when shuting down.

2309

exclude = set(("bus", "changedstate", "secret"))

2310

for name, typ in inspect.getmembers(dbus.service.Object):

2311

exclude.add(name)

2312

2313

client_dict["encrypted_secret"] = client.encrypted_secret

2314

for attr in client.client_structure:

2315

if attr not in exclude:

2316

client_dict[attr] = getattr(client, attr)

2317

2318

clients.append(client_dict)

2319

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

2320

2834

2321

try:

2835

with tempfile.NamedTemporaryFile(

2836

mode='wb',

2837

suffix=".pickle",

2838

prefix='clients-',

2839

dir=os.path.dirname(stored_state_path),

2840

delete=False) as stored_state:

2322

with os.fdopen(os.open(stored_state_path, os.O_CREAT|os.O_WRONLY|os.O_TRUNC, 0600), "wb") as stored_state:

2841

2323

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

2842

tempname = stored_state.name

2843

os.rename(tempname, stored_state_path)

2844

except (IOError, OSError) as e:

2845

if not debug:

2846

try:

2847

os.remove(tempname)

2848

except NameError:

2849

pass

2850

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

2851

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

2852

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

2853

else:

2854

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

2855

exc_info=e)

2324

except IOError as e:

2325

logger.warning("Could not save persistant state: {0}".format(e))

2326

if e.errno != errno.ENOENT:

2856

2327

raise

2857

2328

2858

2329

# Delete all clients, and settings from config

2859

2330

while tcp_server.clients:

2860

2331

name, client = tcp_server.clients.popitem()

2864

2335

client.disable(quiet=True)

2865

2336

if use_dbus:

2866

2337

# Emit D-Bus signal

2867

mandos_dbus_service.ClientRemoved(

2868

client.dbus_object_path, client.name)

2338

mandos_dbus_service.ClientRemoved(client

2339

.dbus_object_path,

2340

client.name)

2869

2341

client_settings.clear()

2870

2342

2871

2343

atexit.register(cleanup)

2877

2349

# Need to initiate checking of clients

2878

2350

if client.enabled:

2879

2351

client.init_checker()

2352

2880

2353

2881

2354

tcp_server.enable()

2882

2355

tcp_server.server_activate()

2883

2356

2884

2357

# Find out what port we got

2885

if zeroconf:

2886

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

2358

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

2887

2359

if use_ipv6:

2888

2360

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

2889

" flowinfo %d, scope_id %d",

2890

*tcp_server.socket.getsockname())

2361

" flowinfo %d, scope_id %d"

2362

% tcp_server.socket.getsockname())

2891

2363

else: # IPv4

2892

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

2893

*tcp_server.socket.getsockname())

2364

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

2365

% tcp_server.socket.getsockname())

2894

2366

2895

2367

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

2896

2368

2897

2369

try:

2898

if zeroconf:

2899

# From the Avahi example code

2900

try:

2901

service.activate()

2902

except dbus.exceptions.DBusException as error:

2903

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

2904

cleanup()

2905

sys.exit(1)

2906

# End of Avahi example code

2370

# From the Avahi example code

2371

try:

2372

service.activate()

2373

except dbus.exceptions.DBusException as error:

2374

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

2375

cleanup()

2376

sys.exit(1)

2377

# End of Avahi example code

2907

2378

2908

2379

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

2909

2380

lambda *args, **kwargs:

2913

2384

logger.debug("Starting main loop")

2914

2385

main_loop.run()

2915

2386

except AvahiError as error:

2916

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

2387

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

2917

2388

cleanup()

2918

2389

sys.exit(1)

2919

2390

except KeyboardInterrupt: