/mandos/trunk : revision 505.1.13

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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 dbus

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import dbus.service

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try:

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import gobject

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except ImportError:

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from gi.repository import GObject as gobject

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import gobject

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import avahi

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from dbus.mainloop.glib import DBusGMainLoop

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import ctypes

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except ImportError:

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SO_BINDTODEVICE = None

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if sys.version_info.major == 2:

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str = unicode

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version = "1.6.9"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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syslogger = None

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try:

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if_nametoindex = ctypes.cdll.LoadLibrary(

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

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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

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

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

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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

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

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return interface_index

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

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"""init logger and add loglevel"""

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global syslogger

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syslogger = (logging.handlers.SysLogHandler(

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facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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address = "/dev/log"))

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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

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pass

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class PGPEngine(object):

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

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def __init__(self):

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

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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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def __enter__(self):

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return self

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

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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

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topdown = False):

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for filename in files:

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

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for dirname in dirs:

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

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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

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

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

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if len(encoded) > 2048:

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

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

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

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

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return encoded

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def encrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(

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dir=self.tempdir) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(

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dir = self.tempdir) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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version = "1.4.0"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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class AvahiError(Exception):

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

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self.value = value

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

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**kwargs)

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

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def __unicode__(self):

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return unicode(repr(self.value))

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class AvahiServiceError(AvahiError):

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pass

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class AvahiGroupError(AvahiError):

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pass

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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def __init__(self,

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interface = avahi.IF_UNSPEC,

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name = None,

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servicetype = None,

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port = None,

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TXT = None,

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domain = "",

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host = "",

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max_renames = 32768,

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protocol = avahi.PROTO_UNSPEC,

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bus = None):

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

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

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

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protocol = avahi.PROTO_UNSPEC, bus = None):

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self.interface = interface

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self.name = name

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self.type = servicetype

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self, remove=True):

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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

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" after %i retries, exiting.",

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self.rename_count)

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raise AvahiServiceError("Too many renames")

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self.name = str(

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self.server.GetAlternativeServiceName(self.name))

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self.rename_count += 1

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self.name = unicode(self.server

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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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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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if (error.get_dbus_name()

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

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

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return self.rename(remove=False)

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else:

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

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self.cleanup()

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os._exit(1)

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.entry_group_state_changed_match = (

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self.group.connect_to_signal(

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'StateChanged', self.entry_group_state_changed))

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'StateChanged', self .entry_group_state_changed))

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

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self.name, self.type)

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self.group.AddService(

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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self.rename()

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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str(error))

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

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unicode(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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def cleanup(self):

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

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException):

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dbus.exceptions.DBusException) as e:

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pass

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self.group = None

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self.remove()

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381

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

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

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

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bad_states = {

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avahi.SERVER_INVALID: "Zeroconf server invalid",

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avahi.SERVER_REGISTERING: None,

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avahi.SERVER_COLLISION: "Zeroconf server name collision",

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avahi.SERVER_FAILURE: "Zeroconf server failure",

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}

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bad_states = { avahi.SERVER_INVALID:

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"Zeroconf server invalid",

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avahi.SERVER_REGISTERING: None,

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avahi.SERVER_COLLISION:

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"Zeroconf server name collision",

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avahi.SERVER_FAILURE:

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"Zeroconf server failure" }

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if state in bad_states:

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if bad_states[state] is not None:

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if error is None:

401

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

402

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else:

403

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

404

405

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def activate(self):

406

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

407

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if self.server is None:

411

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follow_name_owner_changes=True),

412

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avahi.DBUS_INTERFACE_SERVER)

413

264

self.server.connect_to_signal("StateChanged",

414

self.server_state_changed)

265

self.server_state_changed)

415

266

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

416

267

417

268

418

class AvahiServiceToSyslog(AvahiService):

419

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

420

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

421

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

422

syslogger.setFormatter(logging.Formatter(

423

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

424

.format(self.name)))

425

return ret

426

427

269

def _timedelta_to_milliseconds(td):

270

"Convert a datetime.timedelta() to milliseconds"

271

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

272

+ (td.seconds * 1000)

273

+ (td.microseconds // 1000))

274

428

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class Client(object):

429

276

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

430

277

431

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Attributes:

432

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

279

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

433

280

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

434

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

435

282

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

442

289

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

443

290

checker_initiator_tag: a gobject event source tag, or None

444

291

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

445

client_structure: Object describing what attributes a client has

446

and is used for storing the client at exit

447

292

current_checker_command: string; current running checker_command

293

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

448

294

disable_initiator_tag: a gobject event source tag, or None

449

295

enabled: bool()

450

296

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

453

299

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

454

300

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

302

last_enabled: datetime.datetime(); (UTC)

460

303

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

461

304

D-Bus identifiers

462

305

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

463

306

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

464

307

until this client is disabled

465

extended_timeout: extra long timeout when secret has been sent

308

extended_timeout: extra long timeout when password has been sent

466

309

runtime_expansions: Allowed attributes for runtime expansion.

467

310

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

468

311

disabled, or None

469

server_settings: The server_settings dict from main()

470

312

"""

471

313

472

314

runtime_expansions = ("approval_delay", "approval_duration",

473

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

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

475

"last_approval_request", "last_checked_ok",

315

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

316

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

476

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

477

client_defaults = {

478

"timeout": "PT5M",

479

"extended_timeout": "PT15M",

480

"interval": "PT2M",

481

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

482

"host": "",

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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):

318

319

def timeout_milliseconds(self):

320

"Return the 'timeout' attribute in milliseconds"

321

return _timedelta_to_milliseconds(self.timeout)

322

323

def extended_timeout_milliseconds(self):

324

"Return the 'extended_timeout' attribute in milliseconds"

325

return _timedelta_to_milliseconds(self.extended_timeout)

326

327

def interval_milliseconds(self):

328

"Return the 'interval' attribute in milliseconds"

329

return _timedelta_to_milliseconds(self.interval)

330

331

def approval_delay_milliseconds(self):

332

return _timedelta_to_milliseconds(self.approval_delay)

333

334

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

335

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

336

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

337

attribute."""

540

338

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

339

if config is None:

340

config = {}

558

341

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

342

# Uppercase and remove spaces from fingerprint for later

343

# comparison purposes with return value from the fingerprint()

344

# function

345

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

346

.replace(" ", ""))

559

347

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

560

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

561

datetime.datetime.utcnow())

562

563

# attributes specific for this server instance

348

if "secret" in config:

349

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

350

elif "secfile" in config:

351

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

352

(config["secfile"])),

353

"rb") as secfile:

354

self.secret = secfile.read()

355

else:

356

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

357

% self.name)

358

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

359

self.created = datetime.datetime.utcnow()

360

self.enabled = False

361

self.last_approval_request = None

362

self.last_enabled = None

363

self.last_checked_ok = None

364

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

365

self.extended_timeout = string_to_delta(config

366

["extended_timeout"])

367

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

368

self.disable_hook = disable_hook

564

369

self.checker = None

565

370

self.checker_initiator_tag = None

566

371

self.disable_initiator_tag = None

372

self.expires = None

567

373

self.checker_callback_tag = None

374

self.checker_command = config["checker"]

568

375

self.current_checker_command = None

569

self.approved = None

376

self.last_connect = None

377

self._approved = None

378

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

379

True)

570

380

self.approvals_pending = 0

571

self.changedstate = multiprocessing_manager.Condition(

572

multiprocessing_manager.Lock())

573

self.client_structure = [attr

574

for attr in self.__dict__.iterkeys()

575

if not attr.startswith("_")]

576

self.client_structure.append("client_structure")

577

578

for name, t in inspect.getmembers(

579

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

580

if not name.startswith("_"):

581

self.client_structure.append(name)

381

self.approval_delay = string_to_delta(

382

config["approval_delay"])

383

self.approval_duration = string_to_delta(

384

config["approval_duration"])

385

self.changedstate = (multiprocessing_manager

386

.Condition(multiprocessing_manager

387

.Lock()))

582

388

583

# Send notice to process children that client state has changed

584

389

def send_changedstate(self):

585

with self.changedstate:

586

self.changedstate.notify_all()

390

self.changedstate.acquire()

391

self.changedstate.notify_all()

392

self.changedstate.release()

587

393

588

394

def enable(self):

589

395

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

590

396

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

591

397

# Already enabled

592

398

return

399

self.send_changedstate()

400

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

401

# and every interval from then on.

402

self.checker_initiator_tag = (gobject.timeout_add

403

(self.interval_milliseconds(),

404

self.start_checker))

405

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

593

406

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

407

self.disable_initiator_tag = (gobject.timeout_add

408

(self.timeout_milliseconds(),

409

self.disable))

594

410

self.enabled = True

595

411

self.last_enabled = datetime.datetime.utcnow()

596

self.init_checker()

597

self.send_changedstate()

412

# Also start a new checker *right now*.

413

self.start_checker()

598

414

599

415

def disable(self, quiet=True):

600

416

"""Disable this client."""

601

417

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

602

418

return False

603

419

if not quiet:

420

self.send_changedstate()

421

if not quiet:

604

422

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

605

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

423

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

606

424

gobject.source_remove(self.disable_initiator_tag)

607

425

self.disable_initiator_tag = None

608

426

self.expires = None

609

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

427

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

610

428

gobject.source_remove(self.checker_initiator_tag)

611

429

self.checker_initiator_tag = None

612

430

self.stop_checker()

431

if self.disable_hook:

432

self.disable_hook(self)

613

433

self.enabled = False

614

if not quiet:

615

self.send_changedstate()

616

434

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

617

435

return False

618

436

619

437

def __del__(self):

438

self.disable_hook = None

620

439

self.disable()

621

440

622

def init_checker(self):

623

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

624

# and every interval from then on.

625

if self.checker_initiator_tag is not None:

626

gobject.source_remove(self.checker_initiator_tag)

627

self.checker_initiator_tag = gobject.timeout_add(

628

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

629

self.start_checker)

630

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

631

if self.disable_initiator_tag is not None:

632

gobject.source_remove(self.disable_initiator_tag)

633

self.disable_initiator_tag = gobject.timeout_add(

634

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

635

# Also start a new checker *right now*.

636

self.start_checker()

637

638

441

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

639

442

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

640

443

self.checker_callback_tag = None

641

444

self.checker = None

642

445

if os.WIFEXITED(condition):

643

self.last_checker_status = os.WEXITSTATUS(condition)

644

if self.last_checker_status == 0:

446

exitstatus = os.WEXITSTATUS(condition)

447

if exitstatus == 0:

645

448

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

646

449

vars(self))

647

450

self.checked_ok()

648

451

else:

649

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

452

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

453

vars(self))

650

454

else:

651

self.last_checker_status = -1

652

455

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

653

456

vars(self))

654

457

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."""

458

def checked_ok(self, timeout=None):

459

"""Bump up the timeout for this client.

460

461

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

462

alive and well.

463

"""

663

464

if timeout is None:

664

465

timeout = self.timeout

665

if self.disable_initiator_tag is not None:

666

gobject.source_remove(self.disable_initiator_tag)

667

self.disable_initiator_tag = None

668

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

669

self.disable_initiator_tag = gobject.timeout_add(

670

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

671

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

466

self.last_checked_ok = datetime.datetime.utcnow()

467

gobject.source_remove(self.disable_initiator_tag)

468

self.disable_initiator_tag = (gobject.timeout_add

469

(_timedelta_to_milliseconds

470

(timeout), self.disable))

471

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

672

472

673

473

def need_approval(self):

674

474

self.last_approval_request = datetime.datetime.utcnow()

679

479

If a checker already exists, leave it running and do

680

480

nothing."""

681

481

# 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

482

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

483

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

484

# client would inevitably timeout, since no checker would get

485

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

686

486

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

687

487

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

688

488

# should be.

690

490

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

691

491

try:

692

492

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

493

except (AttributeError, OSError) as error:

494

if (isinstance(error, OSError)

495

and error.errno != errno.ECHILD):

496

raise error

698

497

else:

699

498

if pid:

700

499

logger.warning("Checker was a zombie")

703

502

self.current_checker_command)

704

503

# Start a new checker if needed

705

504

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

505

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

506

# In case checker_command has exactly one % operator

507

command = self.checker_command % self.host

508

except TypeError:

509

# Escape attributes for the shell

510

escaped_attrs = dict(

511

(attr,

512

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

513

errors=

514

'replace')))

515

for attr in

516

self.runtime_expansions)

517

518

try:

519

command = self.checker_command % escaped_attrs

520

except TypeError as error:

521

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

522

' %s', self.checker_command, error)

523

return True # Try again later

717

524

self.current_checker_command = command

718

525

try:

719

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

720

self.name)

526

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

527

command, self.name)

721

528

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

722

529

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

723

530

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

724

531

# 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

532

self.checker = subprocess.Popen(command,

734

533

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:

534

shell=True, cwd="/")

535

self.checker_callback_tag = (gobject.child_watch_add

536

(self.checker.pid,

537

self.checker_callback,

538

data=command))

539

# The checker may have completed before the gobject

540

# watch was added. Check for this.

747

541

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

542

if pid:

543

gobject.source_remove(self.checker_callback_tag)

544

self.checker_callback(pid, status, command)

748

545

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)

546

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

547

error)

758

548

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

759

549

return True

760

550

767

557

return

768

558

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

769

559

try:

770

self.checker.terminate()

560

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

771

561

#time.sleep(0.5)

772

562

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

773

# self.checker.kill()

563

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

774

564

except OSError as error:

775

565

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

776

566

raise

777

567

self.checker = None

778

568

779

569

780

def dbus_service_property(dbus_interface,

781

signature="v",

782

access="readwrite",

783

byte_arrays=False):

570

def dbus_service_property(dbus_interface, signature="v",

571

access="readwrite", byte_arrays=False):

784

572

"""Decorators for marking methods of a DBusObjectWithProperties to

785

573

become properties on the D-Bus.

786

574

795

583

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

796

584

if byte_arrays and signature != "ay":

797

585

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

798

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

799

586

" signature %r" % signature)

800

587

def decorator(func):

801

588

func._dbus_is_property = True

802

589

func._dbus_interface = dbus_interface

807

594

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

808

595

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

809

596

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

597

return decorator

853

598

854

599

855

600

class DBusPropertyException(dbus.exceptions.DBusException):

856

601

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

857

602

"""

858

pass

603

def __unicode__(self):

604

return unicode(str(self))

859

605

860

606

861

607

class DBusPropertyAccessException(DBusPropertyException):

879

625

"""

880

626

881

627

@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)

628

def _is_dbus_property(obj):

629

return getattr(obj, "_dbus_is_property", False)

890

630

891

def _get_all_dbus_things(self, thing):

631

def _get_all_dbus_properties(self):

892

632

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

893

633

"""

894

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

895

athing.__get__(self))

634

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

896

635

for cls in self.__class__.__mro__

897

for name, athing in

898

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

636

for name, prop in

637

inspect.getmembers(cls, self._is_dbus_property))

899

638

900

639

def _get_dbus_property(self, interface_name, property_name):

901

640

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

902

641

property with the specified name and interface.

903

642

"""

904

for cls in self.__class__.__mro__:

905

for name, value in inspect.getmembers(

906

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

643

for cls in self.__class__.__mro__:

644

for name, value in (inspect.getmembers

645

(cls, self._is_dbus_property)):

907

646

if (value._dbus_name == property_name

908

647

and value._dbus_interface == interface_name):

909

648

return value.__get__(self)

910

649

911

650

# No such property

912

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

913

self.dbus_object_path, interface_name, property_name))

651

raise DBusPropertyNotFound(self.dbus_object_path + ":"

652

+ interface_name + "."

653

+ property_name)

914

654

915

@dbus.service.method(dbus.PROPERTIES_IFACE,

916

in_signature="ss",

655

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

917

656

out_signature="v")

918

657

def Get(self, interface_name, property_name):

919

658

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

937

676

# The byte_arrays option is not supported yet on

938

677

# signatures other than "ay".

939

678

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))

679

raise ValueError

680

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

681

for byte in value))

945

682

prop(value)

946

683

947

@dbus.service.method(dbus.PROPERTIES_IFACE,

948

in_signature="s",

684

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

949

685

out_signature="a{sv}")

950

686

def GetAll(self, interface_name):

951

687

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

953

689

954

690

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

955

691

"""

956

properties = {}

957

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

692

all = {}

693

for name, prop in self._get_all_dbus_properties():

958

694

if (interface_name

959

695

and interface_name != prop._dbus_interface):

960

696

# Interface non-empty but did not match

964

700

continue

965

701

value = prop()

966

702

if not hasattr(value, "variant_level"):

967

properties[name] = value

703

all[name] = value

968

704

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

705

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

706

value.variant_level+1)

707

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

980

708

981

709

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

982

710

out_signature="s",

983

711

path_keyword='object_path',

984

712

connection_keyword='connection')

985

713

def Introspect(self, object_path, connection):

986

"""Overloading of standard D-Bus method.

987

988

Inserts property tags and interface annotation tags.

714

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

989

715

"""

990

716

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

991

717

connection)

992

718

try:

993

719

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

994

995

720

def make_tag(document, name, prop):

996

721

e = document.createElement("property")

997

722

e.setAttribute("name", name)

998

723

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

999

724

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

1000

725

return e

1001

1002

726

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

1003

# Add property tags

1004

727

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

1005

728

for name, prop

1006

in self._get_all_dbus_things("property")

729

in self._get_all_dbus_properties()

1007

730

if prop._dbus_interface

1008

731

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

1009

732

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

733

# Add the names to the return values for the

1040

734

# "org.freedesktop.DBus.Properties" methods

1041

735

if (if_tag.getAttribute("name")

1056

750

except (AttributeError, xml.dom.DOMException,

1057

751

xml.parsers.expat.ExpatError) as error:

1058

752

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

1059

exc_info=error)

753

error)

1060

754

return xmlstring

1061

755

1062

756

1063

def datetime_to_dbus(dt, variant_level=0):

757

def datetime_to_dbus (dt, variant_level=0):

1064

758

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

1065

759

if dt is None:

1066

760

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).

761

return dbus.String(dt.isoformat(),

762

variant_level=variant_level)

763

764

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

765

.__metaclass__):

766

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

767

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

1092

768

"""

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):

769

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

770

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

771

# methods, signals, or properties in them

772

for base in (b for b in bases

773

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

774

# Go though all attributes of the base class

775

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

1101

776

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

1102

777

# with the wrong interface name

1103

778

if (not hasattr(attribute, "_dbus_interface")

1104

or not attribute._dbus_interface.startswith(

1105

orig_interface_name)):

779

or not attribute._dbus_interface

780

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

1106

781

continue

1107

782

# Create an alternate D-Bus interface name based on

1108

783

# the current name

1109

alt_interface = attribute._dbus_interface.replace(

1110

orig_interface_name, alt_interface_name)

1111

interface_names.add(alt_interface)

784

alt_interface = (attribute._dbus_interface

785

.replace("se.recompile.Mandos",

786

"se.bsnet.fukt.Mandos"))

1112

787

# Is this a D-Bus signal?

1113

788

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

1114

# Extract the original non-method undecorated

1115

# function by black magic

789

# Extract the original non-method function by

790

# black magic

1116

791

nonmethod_func = (dict(

1117

zip(attribute.func_code.co_freevars,

1118

attribute.__closure__))

1119

["func"].cell_contents)

792

zip(attribute.func_code.co_freevars,

793

attribute.__closure__))["func"]

794

.cell_contents)

1120

795

# Create a new, but exactly alike, function

1121

796

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

1122

797

# with the alternate D-Bus interface name

1123

new_function = (dbus.service.signal(

1124

alt_interface, attribute._dbus_signature)

798

new_function = (dbus.service.signal

799

(alt_interface,

800

attribute._dbus_signature)

1125

801

(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

802

nonmethod_func.func_code,

803

nonmethod_func.func_globals,

804

nonmethod_func.func_name,

805

nonmethod_func.func_defaults,

806

nonmethod_func.func_closure)))

1137

807

# 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

808

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

809

# signals gets sent when the function is called

1141

810

def fixscope(func1, func2):

1142

811

"""This function is a scope container to pass

1143

812

func1 and func2 to the "call_both" function

1144

813

outside of its arguments"""

1145

1146

814

def call_both(*args, **kwargs):

1147

815

"""This function will emit two D-Bus

1148

816

signals by calling func1 and func2"""

1149

817

func1(*args, **kwargs)

1150

818

func2(*args, **kwargs)

1151

1152

819

return call_both

1153

820

# Create the "call_both" function and add it to

1154

821

# the class

1155

attr[attrname] = fixscope(attribute, new_function)

822

attr[attrname] = fixscope(attribute,

823

new_function)

1156

824

# Is this a D-Bus method?

1157

825

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

1158

826

# Create a new, but exactly alike, function

1159

827

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

1160

828

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

1161

829

# 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

830

attr[attrname] = (dbus.service.method

831

(alt_interface,

832

attribute._dbus_in_signature,

833

attribute._dbus_out_signature)

834

(types.FunctionType

835

(attribute.func_code,

836

attribute.func_globals,

837

attribute.func_name,

838

attribute.func_defaults,

839

attribute.func_closure)))

1178

840

# Is this a D-Bus property?

1179

841

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

1180

842

# Create a new, but exactly alike, function

1181

843

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

1182

844

# property with the alternate D-Bus interface

1183

845

# 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"})

846

attr[attrname] = (dbus_service_property

847

(alt_interface,

848

attribute._dbus_signature,

849

attribute._dbus_access,

850

attribute

851

._dbus_get_args_options

852

["byte_arrays"])

853

(types.FunctionType

854

(attribute.func_code,

855

attribute.func_globals,

856

attribute.func_name,

857

attribute.func_defaults,

858

attribute.func_closure)))

859

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

860

1241

861

class ClientDBus(Client, DBusObjectWithProperties):

1242

862

"""A Client class using D-Bus

1243

863

1247

867

"""

1248

868

1249

869

runtime_expansions = (Client.runtime_expansions

1250

+ ("dbus_object_path", ))

1251

1252

_interface = "se.recompile.Mandos.Client"

870

+ ("dbus_object_path",))

1253

871

1254

872

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

1255

873

1256

874

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

875

self._approvals_pending = 0

1257

876

self.bus = bus

1258

877

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

1259

878

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

1260

879

# the D-Bus

1261

client_object_name = str(self.name).translate(

880

client_object_name = unicode(self.name).translate(

1262

881

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

1263

882

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

1264

self.dbus_object_path = dbus.ObjectPath(

1265

"/clients/" + client_object_name)

883

self.dbus_object_path = (dbus.ObjectPath

884

("/clients/" + client_object_name))

1266

885

DBusObjectWithProperties.__init__(self, self.bus,

1267

886

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):

887

888

def notifychangeproperty(transform_func,

889

dbus_name, type_func=lambda x: x,

890

variant_level=1):

1274

891

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

1275

892

its changes to DBus.

1276

1277

transform_fun: Function that takes a value and a variant_level

1278

and transforms it to a D-Bus type.

893

894

transform_fun: Function that takes a value and transforms it

895

to a D-Bus type.

1279

896

dbus_name: D-Bus name of the variable

1280

897

type_func: Function that transform the value before sending it

1281

898

to the D-Bus. Default: no transform

1282

899

variant_level: D-Bus variant level. Default: 1

1283

900

"""

1284

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

1285

901

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

1286

902

def setter(self, value):

1287

903

if hasattr(self, "dbus_object_path"):

1288

904

if (not hasattr(self, attrname) or

1289

905

type_func(getattr(self, attrname, None))

1290

906

!= 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())

907

dbus_value = transform_func(type_func(value),

908

variant_level)

909

self.PropertyChanged(dbus.String(dbus_name),

910

dbus_value)

1306

911

setattr(self, attrname, value)

1307

912

1308

913

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

1309

914

915

1310

916

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1311

917

approvals_pending = notifychangeproperty(dbus.Boolean,

1312

918

"ApprovalPending",

1314

920

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

1315

921

last_enabled = notifychangeproperty(datetime_to_dbus,

1316

922

"LastEnabled")

1317

checker = notifychangeproperty(

1318

dbus.Boolean, "CheckerRunning",

1319

type_func = lambda checker: checker is not None)

923

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

924

type_func = lambda checker:

925

checker is not None)

1320

926

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1321

927

"LastCheckedOK")

1322

last_checker_status = notifychangeproperty(dbus.Int16,

1323

"LastCheckerStatus")

1324

928

last_approval_request = notifychangeproperty(

1325

929

datetime_to_dbus, "LastApprovalRequest")

1326

930

approved_by_default = notifychangeproperty(dbus.Boolean,

1327

931

"ApprovedByDefault")

1328

approval_delay = notifychangeproperty(

1329

dbus.UInt64, "ApprovalDelay",

1330

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

932

approval_delay = notifychangeproperty(dbus.UInt16,

933

"ApprovalDelay",

934

type_func =

935

_timedelta_to_milliseconds)

1331

936

approval_duration = notifychangeproperty(

1332

dbus.UInt64, "ApprovalDuration",

1333

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

937

dbus.UInt16, "ApprovalDuration",

938

type_func = _timedelta_to_milliseconds)

1334

939

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

1335

timeout = notifychangeproperty(

1336

dbus.UInt64, "Timeout",

1337

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

940

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

941

type_func =

942

_timedelta_to_milliseconds)

1338

943

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)

944

dbus.UInt16, "ExtendedTimeout",

945

type_func = _timedelta_to_milliseconds)

946

interval = notifychangeproperty(dbus.UInt16,

947

"Interval",

948

type_func =

949

_timedelta_to_milliseconds)

1344

950

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

1345

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

1346

invalidate_only=True)

1347

951

1348

952

del notifychangeproperty

1349

953

1376

980

*args, **kwargs)

1377

981

1378

982

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

1379

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

983

old_checker = self.checker

984

if self.checker is not None:

985

old_checker_pid = self.checker.pid

986

else:

987

old_checker_pid = None

1380

988

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

1381

989

# Only if new checker process was started

1382

990

if (self.checker is not None

1386

994

return r

1387

995

1388

996

def _reset_approved(self):

1389

self.approved = None

997

self._approved = None

1390

998

return False

1391

999

1392

1000

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

1001

self.send_changedstate()

1002

self._approved = value

1003

gobject.timeout_add(_timedelta_to_milliseconds

1004

(self.approval_duration),

1005

self._reset_approved)

1006

1397

1007

1398

1008

## D-Bus methods, signals & properties

1399

1400

## Interfaces

1009

_interface = "se.recompile.Mandos.Client"

1401

1010

1402

1011

## Signals

1403

1012

1414

1023

pass

1415

1024

1416

1025

# PropertyChanged - signal

1417

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

1418

1026

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

1419

1027

def PropertyChanged(self, property, value):

1420

1028

"D-Bus signal"

1484

1092

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

1485

1093

1486

1094

# ApprovedByDefault - property

1487

@dbus_service_property(_interface,

1488

signature="b",

1095

@dbus_service_property(_interface, signature="b",

1489

1096

access="readwrite")

1490

1097

def ApprovedByDefault_dbus_property(self, value=None):

1491

1098

if value is None: # get

1493

1100

self.approved_by_default = bool(value)

1494

1101

1495

1102

# ApprovalDelay - property

1496

@dbus_service_property(_interface,

1497

signature="t",

1103

@dbus_service_property(_interface, signature="t",

1498

1104

access="readwrite")

1499

1105

def ApprovalDelay_dbus_property(self, value=None):

1500

1106

if value is None: # get

1501

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

1502

* 1000)

1107

return dbus.UInt64(self.approval_delay_milliseconds())

1503

1108

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

1504

1109

1505

1110

# ApprovalDuration - property

1506

@dbus_service_property(_interface,

1507

signature="t",

1111

@dbus_service_property(_interface, signature="t",

1508

1112

access="readwrite")

1509

1113

def ApprovalDuration_dbus_property(self, value=None):

1510

1114

if value is None: # get

1511

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

1512

* 1000)

1115

return dbus.UInt64(_timedelta_to_milliseconds(

1116

self.approval_duration))

1513

1117

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

1514

1118

1515

1119

# Name - property

1523

1127

return dbus.String(self.fingerprint)

1524

1128

1525

1129

# Host - property

1526

@dbus_service_property(_interface,

1527

signature="s",

1130

@dbus_service_property(_interface, signature="s",

1528

1131

access="readwrite")

1529

1132

def Host_dbus_property(self, value=None):

1530

1133

if value is None: # get

1531

1134

return dbus.String(self.host)

1532

self.host = str(value)

1135

self.host = value

1533

1136

1534

1137

# Created - property

1535

1138

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

1536

1139

def Created_dbus_property(self):

1537

return datetime_to_dbus(self.created)

1140

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

1538

1141

1539

1142

# LastEnabled - property

1540

1143

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

1542

1145

return datetime_to_dbus(self.last_enabled)

1543

1146

1544

1147

# Enabled - property

1545

@dbus_service_property(_interface,

1546

signature="b",

1148

@dbus_service_property(_interface, signature="b",

1547

1149

access="readwrite")

1548

1150

def Enabled_dbus_property(self, value=None):

1549

1151

if value is None: # get

1554

1156

self.disable()

1555

1157

1556

1158

# LastCheckedOK - property

1557

@dbus_service_property(_interface,

1558

signature="s",

1159

@dbus_service_property(_interface, signature="s",

1559

1160

access="readwrite")

1560

1161

def LastCheckedOK_dbus_property(self, value=None):

1561

1162

if value is not None:

1563

1164

return

1564

1165

return datetime_to_dbus(self.last_checked_ok)

1565

1166

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

1167

# Expires - property

1572

1168

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

1573

1169

def Expires_dbus_property(self):

1579

1175

return datetime_to_dbus(self.last_approval_request)

1580

1176

1581

1177

# Timeout - property

1582

@dbus_service_property(_interface,

1583

signature="t",

1178

@dbus_service_property(_interface, signature="t",

1584

1179

access="readwrite")

1585

1180

def Timeout_dbus_property(self, value=None):

1586

1181

if value is None: # get

1587

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

1588

old_timeout = self.timeout

1182

return dbus.UInt64(self.timeout_milliseconds())

1589

1183

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)

1184

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

1185

return

1186

# Reschedule timeout

1187

gobject.source_remove(self.disable_initiator_tag)

1188

self.disable_initiator_tag = None

1189

self.expires = None

1190

time_to_die = (self.

1191

_timedelta_to_milliseconds((self

1192

.last_checked_ok

1193

+ self.timeout)

1194

- datetime.datetime

1195

.utcnow()))

1196

if time_to_die <= 0:

1197

# The timeout has passed

1198

self.disable()

1199

else:

1200

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

1201

+ datetime.timedelta(milliseconds =

1202

time_to_die))

1203

self.disable_initiator_tag = (gobject.timeout_add

1204

(time_to_die, self.disable))

1605

1205

1606

1206

# ExtendedTimeout - property

1607

@dbus_service_property(_interface,

1608

signature="t",

1207

@dbus_service_property(_interface, signature="t",

1609

1208

access="readwrite")

1610

1209

def ExtendedTimeout_dbus_property(self, value=None):

1611

1210

if value is None: # get

1612

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

1613

* 1000)

1211

return dbus.UInt64(self.extended_timeout_milliseconds())

1614

1212

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

1615

1213

1616

1214

# Interval - property

1617

@dbus_service_property(_interface,

1618

signature="t",

1215

@dbus_service_property(_interface, signature="t",

1619

1216

access="readwrite")

1620

1217

def Interval_dbus_property(self, value=None):

1621

1218

if value is None: # get

1622

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

1219

return dbus.UInt64(self.interval_milliseconds())

1623

1220

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

1624

1221

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

1625

1222

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

1223

# Reschedule checker run

1224

gobject.source_remove(self.checker_initiator_tag)

1225

self.checker_initiator_tag = (gobject.timeout_add

1226

(value, self.start_checker))

1227

self.start_checker() # Start one now, too

1632

1228

1633

1229

# Checker - property

1634

@dbus_service_property(_interface,

1635

signature="s",

1230

@dbus_service_property(_interface, signature="s",

1636

1231

access="readwrite")

1637

1232

def Checker_dbus_property(self, value=None):

1638

1233

if value is None: # get

1639

1234

return dbus.String(self.checker_command)

1640

self.checker_command = str(value)

1235

self.checker_command = value

1641

1236

1642

1237

# CheckerRunning - property

1643

@dbus_service_property(_interface,

1644

signature="b",

1238

@dbus_service_property(_interface, signature="b",

1645

1239

access="readwrite")

1646

1240

def CheckerRunning_dbus_property(self, value=None):

1647

1241

if value is None: # get

1657

1251

return self.dbus_object_path # is already a dbus.ObjectPath

1658

1252

1659

1253

# Secret = property

1660

@dbus_service_property(_interface,

1661

signature="ay",

1662

access="write",

1663

byte_arrays=True)

1254

@dbus_service_property(_interface, signature="ay",

1255

access="write", byte_arrays=True)

1664

1256

def Secret_dbus_property(self, value):

1665

self.secret = bytes(value)

1257

self.secret = str(value)

1666

1258

1667

1259

del _interface

1668

1260

1672

1264

self._pipe = child_pipe

1673

1265

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

1674

1266

if not self._pipe.recv():

1675

raise KeyError(fpr)

1267

raise KeyError()

1676

1268

1677

1269

def __getattribute__(self, name):

1678

if name == '_pipe':

1270

if(name == '_pipe'):

1679

1271

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

1680

1272

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

1681

1273

data = self._pipe.recv()

1682

1274

if data[0] == 'data':

1683

1275

return data[1]

1684

1276

if data[0] == 'function':

1685

1686

1277

def func(*args, **kwargs):

1687

1278

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

1688

1279

return self._pipe.recv()[1]

1689

1690

1280

return func

1691

1281

1692

1282

def __setattr__(self, name, value):

1693

if name == '_pipe':

1283

if(name == '_pipe'):

1694

1284

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

1695

1285

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

1696

1286

1287

class ClientDBusTransitional(ClientDBus):

1288

__metaclass__ = AlternateDBusNamesMetaclass

1697

1289

1698

1290

class ClientHandler(socketserver.BaseRequestHandler, object):

1699

1291

"""A class to handle client connections.

1704

1296

def handle(self):

1705

1297

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

1706

1298

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

1707

str(self.client_address))

1299

unicode(self.client_address))

1708

1300

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

1709

1301

self.server.child_pipe.fileno())

1710

1302

1711

session = gnutls.connection.ClientSession(

1712

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

1303

session = (gnutls.connection

1304

.ClientSession(self.request,

1305

gnutls.connection

1306

.X509Credentials()))

1713

1307

1714

1308

# Note: gnutls.connection.X509Credentials is really a

1715

1309

# generic GnuTLS certificate credentials object so long as

1724

1318

priority = self.server.gnutls_priority

1725

1319

if priority is None:

1726

1320

priority = "NORMAL"

1727

gnutls.library.functions.gnutls_priority_set_direct(

1728

session._c_object, priority, None)

1321

(gnutls.library.functions

1322

.gnutls_priority_set_direct(session._c_object,

1323

priority, None))

1729

1324

1730

1325

# Start communication using the Mandos protocol

1731

1326

# Get protocol number

1733

1328

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

1734

1329

try:

1735

1330

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

1736

raise RuntimeError(line)

1331

raise RuntimeError

1737

1332

except (ValueError, IndexError, RuntimeError) as error:

1738

1333

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

1739

1334

return

1751

1346

approval_required = False

1752

1347

try:

1753

1348

try:

1754

fpr = self.fingerprint(

1755

self.peer_certificate(session))

1349

fpr = self.fingerprint(self.peer_certificate

1350

(session))

1756

1351

except (TypeError,

1757

1352

gnutls.errors.GNUTLSError) as error:

1758

1353

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

1773

1368

while True:

1774

1369

if not client.enabled:

1775

1370

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

1776

client.name)

1371

client.name)

1777

1372

if self.server.use_dbus:

1778

1373

# Emit D-Bus signal

1779

1374

client.Rejected("Disabled")

1780

1375

return

1781

1376

1782

if client.approved or not client.approval_delay:

1377

if client._approved or not client.approval_delay:

1783

1378

#We are approved or approval is disabled

1784

1379

break

1785

elif client.approved is None:

1380

elif client._approved is None:

1786

1381

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

1787

1382

client.name)

1788

1383

if self.server.use_dbus:

1789

1384

# Emit D-Bus signal

1790

1385

client.NeedApproval(

1791

client.approval_delay.total_seconds()

1792

* 1000, client.approved_by_default)

1386

client.approval_delay_milliseconds(),

1387

client.approved_by_default)

1793

1388

else:

1794

1389

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

1795

1390

client.name)

1801

1396

#wait until timeout or approved

1802

1397

time = datetime.datetime.now()

1803

1398

client.changedstate.acquire()

1804

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

1399

(client.changedstate.wait

1400

(float(client._timedelta_to_milliseconds(delay)

1401

/ 1000)))

1805

1402

client.changedstate.release()

1806

1403

time2 = datetime.datetime.now()

1807

1404

if (time2 - time) >= delay:

1823

1420

try:

1824

1421

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

1825

1422

except gnutls.errors.GNUTLSError as error:

1826

logger.warning("gnutls send failed",

1827

exc_info=error)

1423

logger.warning("gnutls send failed")

1828

1424

return

1829

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

1830

len(client.secret) - (sent_size

1831

+ sent))

1425

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

1426

sent, len(client.secret)

1427

- (sent_size + sent))

1832

1428

sent_size += sent

1833

1429

1834

1430

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

1835

1431

# bump the timeout using extended_timeout

1836

client.bump_timeout(client.extended_timeout)

1432

client.checked_ok(client.extended_timeout)

1837

1433

if self.server.use_dbus:

1838

1434

# Emit D-Bus signal

1839

1435

client.GotSecret()

1844

1440

try:

1845

1441

session.bye()

1846

1442

except gnutls.errors.GNUTLSError as error:

1847

logger.warning("GnuTLS bye failed",

1848

exc_info=error)

1443

logger.warning("GnuTLS bye failed")

1849

1444

1850

1445

@staticmethod

1851

1446

def peer_certificate(session):

1852

1447

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

1853

1448

# If not an OpenPGP certificate...

1854

if (gnutls.library.functions.gnutls_certificate_type_get(

1855

session._c_object)

1449

if (gnutls.library.functions

1450

.gnutls_certificate_type_get(session._c_object)

1856

1451

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

1857

1452

# ...do the normal thing

1858

1453

return session.peer_certificate

1872

1467

def fingerprint(openpgp):

1873

1468

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

1874

1469

# 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)))

1470

datum = (gnutls.library.types

1471

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

1472

ctypes.POINTER

1473

(ctypes.c_ubyte)),

1474

ctypes.c_uint(len(openpgp))))

1879

1475

# New empty GnuTLS certificate

1880

1476

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1881

gnutls.library.functions.gnutls_openpgp_crt_init(

1882

ctypes.byref(crt))

1477

(gnutls.library.functions

1478

.gnutls_openpgp_crt_init(ctypes.byref(crt)))

1883

1479

# 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)

1480

(gnutls.library.functions

1481

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

1482

gnutls.library.constants

1483

.GNUTLS_OPENPGP_FMT_RAW))

1887

1484

# Verify the self signature in the key

1888

1485

crtverify = ctypes.c_uint()

1889

gnutls.library.functions.gnutls_openpgp_crt_verify_self(

1890

crt, 0, ctypes.byref(crtverify))

1486

(gnutls.library.functions

1487

.gnutls_openpgp_crt_verify_self(crt, 0,

1488

ctypes.byref(crtverify)))

1891

1489

if crtverify.value != 0:

1892

1490

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1893

raise gnutls.errors.CertificateSecurityError(

1894

"Verify failed")

1491

raise (gnutls.errors.CertificateSecurityError

1492

("Verify failed"))

1895

1493

# New buffer for the fingerprint

1896

1494

buf = ctypes.create_string_buffer(20)

1897

1495

buf_len = ctypes.c_size_t()

1898

1496

# 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))

1497

(gnutls.library.functions

1498

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

1499

ctypes.byref(buf_len)))

1901

1500

# Deinit the certificate

1902

1501

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1903

1502

# Convert the buffer to a Python bytestring

1904

1503

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

1905

1504

# Convert the bytestring to hexadecimal notation

1906

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

1505

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

1907

1506

return hex_fpr

1908

1507

1909

1508

1910

1509

class MultiprocessingMixIn(object):

1911

1510

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

1912

1913

1511

def sub_process_main(self, request, address):

1914

1512

try:

1915

1513

self.finish_request(request, address)

1916

except Exception:

1514

except:

1917

1515

self.handle_error(request, address)

1918

1516

self.close_request(request)

1919

1517

1920

1518

def process_request(self, request, address):

1921

1519

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

1922

1520

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

1923

args = (request, address))

1521

args = (request,

1522

address))

1924

1523

proc.start()

1925

1524

return proc

1926

1525

1927

1526

1928

1527

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1929

1528

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

1930

1931

1529

def process_request(self, request, client_address):

1932

1530

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

1933

1531

1942

1540

1943

1541

def add_pipe(self, parent_pipe, proc):

1944

1542

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

1945

raise NotImplementedError()

1543

raise NotImplementedError

1946

1544

1947

1545

1948

1546

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1954

1552

interface: None or a network interface name (string)

1955

1553

use_ipv6: Boolean; to use IPv6 or not

1956

1554

"""

1957

1958

1555

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

"""

1556

interface=None, use_ipv6=True):

1965

1557

self.interface = interface

1966

1558

if use_ipv6:

1967

1559

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

1560

socketserver.TCPServer.__init__(self, server_address,

1995

1561

RequestHandlerClass)

1996

1997

1562

def server_bind(self):

1998

1563

"""This overrides the normal server_bind() function

1999

1564

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

2005

1570

self.interface)

2006

1571

else:

2007

1572

try:

2008

self.socket.setsockopt(

2009

socket.SOL_SOCKET, SO_BINDTODEVICE,

2010

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

1573

self.socket.setsockopt(socket.SOL_SOCKET,

1574

SO_BINDTODEVICE,

1575

str(self.interface

1576

+ '\0'))

2011

1577

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:

1578

if error[0] == errno.EPERM:

1579

logger.error("No permission to"

1580

" bind to interface %s",

1581

self.interface)

1582

elif error[0] == errno.ENOPROTOOPT:

2016

1583

logger.error("SO_BINDTODEVICE not available;"

2017

1584

" cannot bind to interface %s",

2018

1585

self.interface)

2019

elif error.errno == errno.ENODEV:

2020

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

2021

" cannot bind", self.interface)

2022

1586

else:

2023

1587

raise

2024

1588

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

2027

1591

if self.address_family == socket.AF_INET6:

2028

1592

any_address = "::" # in6addr_any

2029

1593

else:

2030

any_address = "0.0.0.0" # INADDR_ANY

1594

any_address = socket.INADDR_ANY

2031

1595

self.server_address = (any_address,

2032

1596

self.server_address[1])

2033

1597

elif not self.server_address[1]:

2034

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

1598

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

1599

0)

2035

1600

# if self.interface:

2036

1601

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

2037

1602

# 0, # port

2051

1616

2052

1617

Assumes a gobject.MainLoop event loop.

2053

1618

"""

2054

2055

1619

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):

1620

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

1621

gnutls_priority=None, use_dbus=True):

2062

1622

self.enabled = False

2063

1623

self.clients = clients

2064

1624

if self.clients is None:

2065

self.clients = {}

1625

self.clients = set()

2066

1626

self.use_dbus = use_dbus

2067

1627

self.gnutls_priority = gnutls_priority

2068

1628

IPv6_TCPServer.__init__(self, server_address,

2069

1629

RequestHandlerClass,

2070

1630

interface = interface,

2071

use_ipv6 = use_ipv6,

2072

socketfd = socketfd)

2073

1631

use_ipv6 = use_ipv6)

2074

1632

def server_activate(self):

2075

1633

if self.enabled:

2076

1634

return socketserver.TCPServer.server_activate(self)

2080

1638

2081

1639

def add_pipe(self, parent_pipe, proc):

2082

1640

# 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))

1641

gobject.io_add_watch(parent_pipe.fileno(),

1642

gobject.IO_IN | gobject.IO_HUP,

1643

functools.partial(self.handle_ipc,

1644

parent_pipe =

1645

parent_pipe,

1646

proc = proc))

2089

1647

2090

def handle_ipc(self, source, condition,

2091

parent_pipe=None,

2092

proc = None,

2093

client_object=None):

1648

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

1649

proc = None, client_object=None):

1650

condition_names = {

1651

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

1652

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

1653

# blocking).

1654

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

1655

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

1656

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

1657

# broken, usually for pipes and

1658

# sockets).

1659

}

1660

conditions_string = ' | '.join(name

1661

for cond, name in

1662

condition_names.iteritems()

1663

if cond & condition)

2094

1664

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

2095

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

1665

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

2096

1666

# Wait for other process to exit

2097

1667

proc.join()

2098

1668

return False

2105

1675

fpr = request[1]

2106

1676

address = request[2]

2107

1677

2108

for c in self.clients.itervalues():

1678

for c in self.clients:

2109

1679

if c.fingerprint == fpr:

2110

1680

client = c

2111

1681

break

2119

1689

parent_pipe.send(False)

2120

1690

return False

2121

1691

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))

1692

gobject.io_add_watch(parent_pipe.fileno(),

1693

gobject.IO_IN | gobject.IO_HUP,

1694

functools.partial(self.handle_ipc,

1695

parent_pipe =

1696

parent_pipe,

1697

proc = proc,

1698

client_object =

1699

client))

2129

1700

parent_pipe.send(True)

2130

1701

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

2131

1702

# same fileno

2137

1708

2138

1709

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

2139

1710

funcname)(*args,

2140

**kwargs)))

1711

**kwargs)))

2141

1712

2142

1713

if command == 'getattr':

2143

1714

attrname = request[1]

2144

1715

if callable(client_object.__getattribute__(attrname)):

2145

parent_pipe.send(('function', ))

1716

parent_pipe.send(('function',))

2146

1717

else:

2147

parent_pipe.send((

2148

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

1718

parent_pipe.send(('data', client_object

1719

.__getattribute__(attrname)))

2149

1720

2150

1721

if command == 'setattr':

2151

1722

attrname = request[1]

2155

1726

return True

2156

1727

2157

1728

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

1729

def string_to_delta(interval):

2264

1730

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

2265

1731

2276

1742

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

2277

1743

datetime.timedelta(0, 330)

2278

1744

"""

2279

2280

try:

2281

return rfc3339_duration_to_delta(interval)

2282

except ValueError:

2283

pass

2284

2285

1745

timevalue = datetime.timedelta(0)

2286

1746

for s in interval.split():

2287

1747

try:

2288

suffix = s[-1]

1748

suffix = unicode(s[-1])

2289

1749

value = int(s[:-1])

2290

1750

if suffix == "d":

2291

1751

delta = datetime.timedelta(value)

2298

1758

elif suffix == "w":

2299

1759

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

2300

1760

else:

2301

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

2302

except IndexError as e:

1761

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

1762

except (ValueError, IndexError) as e:

2303

1763

raise ValueError(*(e.args))

2304

1764

timevalue += delta

2305

1765

return timevalue

2306

1766

2307

1767

1768

def if_nametoindex(interface):

1769

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

1770

1771

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

1772

global if_nametoindex

1773

try:

1774

if_nametoindex = (ctypes.cdll.LoadLibrary

1775

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

1776

.if_nametoindex)

1777

except (OSError, AttributeError):

1778

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

1779

def if_nametoindex(interface):

1780

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

1781

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

1782

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

1783

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1784

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

1785

interface))

1786

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

1787

ifreq[16:20])[0]

1788

return interface_index

1789

return if_nametoindex(interface)

1790

1791

2308

1792

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

2309

1793

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

2310

1794

2318

1802

sys.exit()

2319

1803

if not noclose:

2320

1804

# Close all standard open file descriptors

2321

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

1805

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

2322

1806

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

2323

1807

raise OSError(errno.ENODEV,

2324

"{} not a character device"

2325

.format(os.devnull))

1808

"%s not a character device"

1809

% os.path.devnull)

2326

1810

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

2327

1811

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

2328

1812

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

2337

1821

2338

1822

parser = argparse.ArgumentParser()

2339

1823

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

2340

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

1824

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

2341

1825

help="show version number and exit")

2342

1826

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

2343

1827

help="Bind to interface IF")

2349

1833

help="Run self-test")

2350

1834

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

2351

1835

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

2352

" to terminal", default=None)

1836

" to terminal")

2353

1837

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

2354

1838

help="Debug level for stdout output")

2355

1839

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

2362

1846

" files")

2363

1847

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

2364

1848

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

2365

" system bus interface", default=None)

1849

" system bus interface")

2366

1850

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

2367

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

2368

default=None)

2369

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

1851

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

2383

1852

options = parser.parse_args()

2384

1853

2385

1854

if options.check:

2386

1855

import doctest

2387

fail_count, test_count = doctest.testmod()

2388

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

1856

doctest.testmod()

1857

sys.exit()

2389

1858

2390

1859

# Default values for config file for server-global settings

2391

1860

server_defaults = { "interface": "",

2393

1862

"port": "",

2394

1863

"debug": "False",

2395

1864

"priority":

2396

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

2397

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

1865

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

2398

1866

"servicename": "Mandos",

2399

1867

"use_dbus": "True",

2400

1868

"use_ipv6": "True",

2401

1869

"debuglevel": "",

2402

"restore": "True",

2403

"socket": "",

2404

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

2405

"foreground": "False",

2406

"zeroconf": "True",

2407

}

1870

}

2408

1871

2409

1872

# Parse config file for server-global settings

2410

1873

server_config = configparser.SafeConfigParser(server_defaults)

2411

1874

del server_defaults

2412

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

1875

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

1876

"mandos.conf"))

2413

1877

# Convert the SafeConfigParser object to a dict

2414

1878

server_settings = server_config.defaults()

2415

1879

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

2416

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

1880

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

2417

1881

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

2418

1882

option)

2419

1883

if server_settings["port"]:

2420

1884

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

2421

1885

"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

1886

del server_config

2432

1887

2433

1888

# Override the settings from the config file with command line

2434

1889

# options, if set.

2435

1890

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

2436

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

2437

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

2438

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

1891

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

1892

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

2439

1893

value = getattr(options, option)

2440

1894

if value is not None:

2441

1895

server_settings[option] = value

2442

1896

del options

2443

1897

# Force all strings to be unicode

2444

1898

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

1899

if type(server_settings[option]) is str:

1900

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

2455

1901

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

2456

1902

2457

1903

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

2458

1904

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

1905

# For convenience

2465

1906

debug = server_settings["debug"]

2466

1907

debuglevel = server_settings["debuglevel"]

2467

1908

use_dbus = server_settings["use_dbus"]

2468

1909

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

1910

2483

1911

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

2484

syslogger.setFormatter(

2485

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

2486

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

2487

server_settings["servicename"])))

1912

syslogger.setFormatter(logging.Formatter

1913

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

1914

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

1915

% server_settings["servicename"]))

2488

1916

2489

1917

# Parse config file with clients

2490

client_config = configparser.SafeConfigParser(Client

2491

.client_defaults)

1918

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

1919

"extended_timeout": "15m",

1920

"interval": "2m",

1921

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

1922

"host": "",

1923

"approval_delay": "0s",

1924

"approval_duration": "1s",

1925

}

1926

client_config = configparser.SafeConfigParser(client_defaults)

2492

1927

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

2493

1928

"clients.conf"))

2494

1929

2495

1930

global mandos_dbus_service

2496

1931

mandos_dbus_service = None

2497

1932

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

1933

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

1934

server_settings["port"]),

1935

ClientHandler,

1936

interface=(server_settings["interface"]

1937

or None),

1938

use_ipv6=use_ipv6,

1939

gnutls_priority=

1940

server_settings["priority"],

1941

use_dbus=use_dbus)

1942

if not debug:

1943

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

2514

1944

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)

1945

pidfile = open(pidfilename, "w")

1946

except IOError:

1947

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

2519

1948

2520

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

1949

try:

1950

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

1951

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

1952

except KeyError:

2521

1953

try:

2522

uid = pwd.getpwnam(name).pw_uid

2523

gid = pwd.getpwnam(name).pw_gid

2524

break

1954

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

1955

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

2525

1956

except KeyError:

2526

continue

2527

else:

2528

uid = 65534

2529

gid = 65534

1957

try:

1958

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

1959

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

1960

except KeyError:

1961

uid = 65534

1962

gid = 65534

2530

1963

try:

2531

1964

os.setgid(gid)

2532

1965

os.setuid(uid)

2533

1966

except OSError as error:

2534

if error.errno != errno.EPERM:

2535

raise

1967

if error[0] != errno.EPERM:

1968

raise error

1969

1970

if not debug and not debuglevel:

1971

syslogger.setLevel(logging.WARNING)

1972

console.setLevel(logging.WARNING)

1973

if debuglevel:

1974

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

1975

syslogger.setLevel(level)

1976

console.setLevel(level)

2536

1977

2537

1978

if debug:

2538

1979

# Enable all possible GnuTLS debugging

2545

1986

def debug_gnutls(level, string):

2546

1987

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

2547

1988

2548

gnutls.library.functions.gnutls_global_set_log_function(

2549

debug_gnutls)

1989

(gnutls.library.functions

1990

.gnutls_global_set_log_function(debug_gnutls))

2550

1991

2551

1992

# Redirect stdin so all checkers get /dev/null

2552

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

1993

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

2553

1994

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

2554

1995

if null > 2:

2555

1996

os.close(null)

1997

else:

1998

# No console logging

1999

logger.removeHandler(console)

2556

2000

2557

2001

# Need to fork before connecting to D-Bus

2558

if not foreground:

2002

if not debug:

2559

2003

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

2560

2004

daemon()

2561

2005

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

2006

global main_loop

2567

2007

# From the Avahi example code

2568

DBusGMainLoop(set_as_default=True)

2008

DBusGMainLoop(set_as_default=True )

2569

2009

main_loop = gobject.MainLoop()

2570

2010

bus = dbus.SystemBus()

2571

2011

# End of Avahi example code

2572

2012

if use_dbus:

2573

2013

try:

2574

2014

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)

2015

bus, do_not_queue=True)

2016

old_bus_name = (dbus.service.BusName

2017

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

2018

do_not_queue=True))

2019

except dbus.exceptions.NameExistsException as e:

2020

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

2582

2021

use_dbus = False

2583

2022

server_settings["use_dbus"] = False

2584

2023

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"))

2024

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2025

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

2026

servicetype = "_mandos._tcp",

2027

protocol = protocol, bus = bus)

2028

if server_settings["interface"]:

2029

service.interface = (if_nametoindex

2030

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

2595

2031

2596

2032

global multiprocessing_manager

2597

2033

multiprocessing_manager = multiprocessing.Manager()

2598

2034

2599

2035

client_class = Client

2600

2036

if use_dbus:

2601

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

2602

2603

client_settings = Client.config_parser(client_config)

2604

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.

2616

if server_settings["restore"]:

2617

try:

2618

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

2619

clients_data, old_client_settings = pickle.load(

2620

stored_state)

2621

os.remove(stored_state_path)

2622

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)

2629

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))

2037

client_class = functools.partial(ClientDBusTransitional,

2038

bus = bus)

2039

def client_config_items(config, section):

2040

special_settings = {

2041

"approved_by_default":

2042

lambda: config.getboolean(section,

2043

"approved_by_default"),

2044

}

2045

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

2686

2046

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

2047

yield (name, special_settings[name]())

2048

except KeyError:

2049

yield (name, value)

2050

2051

tcp_server.clients.update(set(

2052

client_class(name = section,

2053

config= dict(client_config_items(

2054

client_config, section)))

2055

for section in client_config.sections()))

2712

2056

if not tcp_server.clients:

2713

2057

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

2058

2059

if not debug:

2060

try:

2061

with pidfile:

2062

pid = os.getpid()

2063

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

2064

del pidfile

2065

except IOError:

2066

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

2067

pidfilename, pid)

2068

except NameError:

2069

# "pidfile" was never created

2070

pass

2725

2071

del pidfilename

2072

2073

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

2726

2074

2727

2075

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

2728

2076

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

2729

2077

2730

2078

if use_dbus:

2731

2732

@alternate_dbus_interfaces(

2733

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

2734

class MandosDBusService(DBusObjectWithProperties):

2079

class MandosDBusService(dbus.service.Object):

2735

2080

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

2736

2737

2081

def __init__(self):

2738

2082

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

2739

2740

2083

_interface = "se.recompile.Mandos"

2741

2084

2742

@dbus_interface_annotations(_interface)

2743

def _foo(self):

2744

return {

2745

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

2746

"false" }

2747

2748

2085

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

2749

2086

def ClientAdded(self, objpath):

2750

2087

"D-Bus signal"

2763

2100

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

2764

2101

def GetAllClients(self):

2765

2102

"D-Bus method"

2766

return dbus.Array(c.dbus_object_path for c in

2767

tcp_server.clients.itervalues())

2103

return dbus.Array(c.dbus_object_path

2104

for c in tcp_server.clients)

2768

2105

2769

2106

@dbus.service.method(_interface,

2770

2107

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

2771

2108

def GetAllClientsWithProperties(self):

2772

2109

"D-Bus method"

2773

2110

return dbus.Dictionary(

2774

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

2775

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

2111

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

2112

for c in tcp_server.clients),

2776

2113

signature="oa{sv}")

2777

2114

2778

2115

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

2779

2116

def RemoveClient(self, object_path):

2780

2117

"D-Bus method"

2781

for c in tcp_server.clients.itervalues():

2118

for c in tcp_server.clients:

2782

2119

if c.dbus_object_path == object_path:

2783

del tcp_server.clients[c.name]

2120

tcp_server.clients.remove(c)

2784

2121

c.remove_from_connection()

2785

2122

# Don't signal anything except ClientRemoved

2786

2123

c.disable(quiet=True)

2791

2128

2792

2129

del _interface

2793

2130

2794

mandos_dbus_service = MandosDBusService()

2131

class MandosDBusServiceTransitional(MandosDBusService):

2132

__metaclass__ = AlternateDBusNamesMetaclass

2133

mandos_dbus_service = MandosDBusServiceTransitional()

2795

2134

2796

2135

def cleanup():

2797

2136

"Cleanup function; run on exit"

2798

if zeroconf:

2799

service.cleanup()

2137

service.cleanup()

2800

2138

2801

2139

multiprocessing.active_children()

2802

wnull.close()

2803

if not (tcp_server.clients or client_settings):

2804

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

2834

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:

2841

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)

2856

raise

2857

2858

# Delete all clients, and settings from config

2859

2140

while tcp_server.clients:

2860

name, client = tcp_server.clients.popitem()

2141

client = tcp_server.clients.pop()

2861

2142

if use_dbus:

2862

2143

client.remove_from_connection()

2144

client.disable_hook = None

2863

2145

# Don't signal anything except ClientRemoved

2864

2146

client.disable(quiet=True)

2865

2147

if use_dbus:

2866

2148

# Emit D-Bus signal

2867

mandos_dbus_service.ClientRemoved(

2868

client.dbus_object_path, client.name)

2869

client_settings.clear()

2149

mandos_dbus_service.ClientRemoved(client

2150

.dbus_object_path,

2151

client.name)

2870

2152

2871

2153

atexit.register(cleanup)

2872

2154

2873

for client in tcp_server.clients.itervalues():

2155

for client in tcp_server.clients:

2874

2156

if use_dbus:

2875

2157

# Emit D-Bus signal

2876

2158

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2877

# Need to initiate checking of clients

2878

if client.enabled:

2879

client.init_checker()

2159

client.enable()

2880

2160

2881

2161

tcp_server.enable()

2882

2162

tcp_server.server_activate()

2883

2163

2884

2164

# Find out what port we got

2885

if zeroconf:

2886

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

2165

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

2887

2166

if use_ipv6:

2888

2167

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

2889

" flowinfo %d, scope_id %d",

2890

*tcp_server.socket.getsockname())

2168

" flowinfo %d, scope_id %d"

2169

% tcp_server.socket.getsockname())

2891

2170

else: # IPv4

2892

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

2893

*tcp_server.socket.getsockname())

2171

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

2172

% tcp_server.socket.getsockname())

2894

2173

2895

2174

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

2896

2175

2897

2176

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

2177

# From the Avahi example code

2178

try:

2179

service.activate()

2180

except dbus.exceptions.DBusException as error:

2181

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

2182

cleanup()

2183

sys.exit(1)

2184

# End of Avahi example code

2907

2185

2908

2186

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

2909

2187

lambda *args, **kwargs:

2913

2191

logger.debug("Starting main loop")

2914

2192

main_loop.run()

2915

2193

except AvahiError as error:

2916

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

2194

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

2917

2195

cleanup()

2918

2196

sys.exit(1)

2919

2197

except KeyboardInterrupt: