/mandos/trunk : revision 505.3.10

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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 = "1.4.1"

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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

263

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

281

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": "",

483

"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

466

self.last_checked_ok = datetime.datetime.utcnow()

665

467

if self.disable_initiator_tag is not None:

666

468

gobject.source_remove(self.disable_initiator_tag)

667

self.disable_initiator_tag = None

668

469

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

669

self.disable_initiator_tag = gobject.timeout_add(

670

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

470

self.disable_initiator_tag = (gobject.timeout_add

471

(_timedelta_to_milliseconds

472

(timeout), self.disable))

671

473

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

672

474

673

475

def need_approval(self):

679

481

If a checker already exists, leave it running and do

680

482

nothing."""

681

483

# 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

484

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

485

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

486

# client would inevitably timeout, since no checker would get

487

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

686

488

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

687

489

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

688

490

# should be.

690

492

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

691

493

try:

692

494

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

495

except (AttributeError, OSError) as error:

496

if (isinstance(error, OSError)

497

and error.errno != errno.ECHILD):

498

raise error

698

499

else:

699

500

if pid:

700

501

logger.warning("Checker was a zombie")

703

504

self.current_checker_command)

704

505

# Start a new checker if needed

705

506

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

507

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

508

# In case checker_command has exactly one % operator

509

command = self.checker_command % self.host

510

except TypeError:

511

# Escape attributes for the shell

512

escaped_attrs = dict(

513

(attr,

514

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

515

errors=

516

'replace')))

517

for attr in

518

self.runtime_expansions)

519

520

try:

521

command = self.checker_command % escaped_attrs

522

except TypeError as error:

523

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

524

' %s', self.checker_command, error)

525

return True # Try again later

717

526

self.current_checker_command = command

718

527

try:

719

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

720

self.name)

528

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

529

command, self.name)

721

530

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

722

531

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

723

532

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

724

533

# 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

534

self.checker = subprocess.Popen(command,

734

535

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:

536

shell=True, cwd="/")

537

self.checker_callback_tag = (gobject.child_watch_add

538

(self.checker.pid,

539

self.checker_callback,

540

data=command))

541

# The checker may have completed before the gobject

542

# watch was added. Check for this.

747

543

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

544

if pid:

545

gobject.source_remove(self.checker_callback_tag)

546

self.checker_callback(pid, status, command)

748

547

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)

548

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

549

error)

758

550

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

759

551

return True

760

552

767

559

return

768

560

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

769

561

try:

770

self.checker.terminate()

562

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

771

563

#time.sleep(0.5)

772

564

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

773

# self.checker.kill()

565

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

774

566

except OSError as error:

775

567

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

776

568

raise

777

569

self.checker = None

778

570

779

571

780

def dbus_service_property(dbus_interface,

781

signature="v",

782

access="readwrite",

783

byte_arrays=False):

572

def dbus_service_property(dbus_interface, signature="v",

573

access="readwrite", byte_arrays=False):

784

574

"""Decorators for marking methods of a DBusObjectWithProperties to

785

575

become properties on the D-Bus.

786

576

795

585

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

796

586

if byte_arrays and signature != "ay":

797

587

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

798

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

799

588

" signature %r" % signature)

800

589

def decorator(func):

801

590

func._dbus_is_property = True

802

591

func._dbus_interface = dbus_interface

807

596

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

808

597

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

809

598

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

599

return decorator

853

600

854

601

855

602

class DBusPropertyException(dbus.exceptions.DBusException):

856

603

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

857

604

"""

858

pass

605

def __unicode__(self):

606

return unicode(str(self))

859

607

860

608

861

609

class DBusPropertyAccessException(DBusPropertyException):

879

627

"""

880

628

881

629

@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)

630

def _is_dbus_property(obj):

631

return getattr(obj, "_dbus_is_property", False)

890

632

891

def _get_all_dbus_things(self, thing):

633

def _get_all_dbus_properties(self):

892

634

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

893

635

"""

894

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

895

athing.__get__(self))

636

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

896

637

for cls in self.__class__.__mro__

897

for name, athing in

898

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

638

for name, prop in

639

inspect.getmembers(cls, self._is_dbus_property))

899

640

900

641

def _get_dbus_property(self, interface_name, property_name):

901

642

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

902

643

property with the specified name and interface.

903

644

"""

904

for cls in self.__class__.__mro__:

905

for name, value in inspect.getmembers(

906

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

645

for cls in self.__class__.__mro__:

646

for name, value in (inspect.getmembers

647

(cls, self._is_dbus_property)):

907

648

if (value._dbus_name == property_name

908

649

and value._dbus_interface == interface_name):

909

650

return value.__get__(self)

910

651

911

652

# No such property

912

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

913

self.dbus_object_path, interface_name, property_name))

653

raise DBusPropertyNotFound(self.dbus_object_path + ":"

654

+ interface_name + "."

655

+ property_name)

914

656

915

@dbus.service.method(dbus.PROPERTIES_IFACE,

916

in_signature="ss",

657

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

917

658

out_signature="v")

918

659

def Get(self, interface_name, property_name):

919

660

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

937

678

# The byte_arrays option is not supported yet on

938

679

# signatures other than "ay".

939

680

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))

681

raise ValueError

682

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

683

for byte in value))

945

684

prop(value)

946

685

947

@dbus.service.method(dbus.PROPERTIES_IFACE,

948

in_signature="s",

686

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

949

687

out_signature="a{sv}")

950

688

def GetAll(self, interface_name):

951

689

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

953

691

954

692

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

955

693

"""

956

properties = {}

957

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

694

all = {}

695

for name, prop in self._get_all_dbus_properties():

958

696

if (interface_name

959

697

and interface_name != prop._dbus_interface):

960

698

# Interface non-empty but did not match

964

702

continue

965

703

value = prop()

966

704

if not hasattr(value, "variant_level"):

967

properties[name] = value

705

all[name] = value

968

706

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

707

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

708

value.variant_level+1)

709

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

980

710

981

711

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

982

712

out_signature="s",

983

713

path_keyword='object_path',

984

714

connection_keyword='connection')

985

715

def Introspect(self, object_path, connection):

986

"""Overloading of standard D-Bus method.

987

988

Inserts property tags and interface annotation tags.

716

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

989

717

"""

990

718

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

991

719

connection)

992

720

try:

993

721

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

994

995

722

def make_tag(document, name, prop):

996

723

e = document.createElement("property")

997

724

e.setAttribute("name", name)

998

725

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

999

726

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

1000

727

return e

1001

1002

728

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

1003

# Add property tags

1004

729

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

1005

730

for name, prop

1006

in self._get_all_dbus_things("property")

731

in self._get_all_dbus_properties()

1007

732

if prop._dbus_interface

1008

733

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

1009

734

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

735

# Add the names to the return values for the

1040

736

# "org.freedesktop.DBus.Properties" methods

1041

737

if (if_tag.getAttribute("name")

1056

752

except (AttributeError, xml.dom.DOMException,

1057

753

xml.parsers.expat.ExpatError) as error:

1058

754

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

1059

exc_info=error)

755

error)

1060

756

return xmlstring

1061

757

1062

758

1063

def datetime_to_dbus(dt, variant_level=0):

759

def datetime_to_dbus (dt, variant_level=0):

1064

760

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

1065

761

if dt is None:

1066

762

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).

763

return dbus.String(dt.isoformat(),

764

variant_level=variant_level)

765

766

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

767

.__metaclass__):

768

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

769

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

1092

770

"""

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):

771

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

772

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

773

# methods, signals, or properties in them

774

for base in (b for b in bases

775

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

776

# Go though all attributes of the base class

777

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

1101

778

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

1102

779

# with the wrong interface name

1103

780

if (not hasattr(attribute, "_dbus_interface")

1104

or not attribute._dbus_interface.startswith(

1105

orig_interface_name)):

781

or not attribute._dbus_interface

782

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

1106

783

continue

1107

784

# Create an alternate D-Bus interface name based on

1108

785

# the current name

1109

alt_interface = attribute._dbus_interface.replace(

1110

orig_interface_name, alt_interface_name)

1111

interface_names.add(alt_interface)

786

alt_interface = (attribute._dbus_interface

787

.replace("se.recompile.Mandos",

788

"se.bsnet.fukt.Mandos"))

1112

789

# Is this a D-Bus signal?

1113

790

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

1114

if sys.version == 2:

1115

# Extract the original non-method undecorated

1116

# function by black magic

1117

nonmethod_func = (dict(

791

# Extract the original non-method function by

792

# black magic

793

nonmethod_func = (dict(

1118

794

zip(attribute.func_code.co_freevars,

1119

attribute.__closure__))

1120

["func"].cell_contents)

1121

else:

1122

nonmethod_func = attribute

795

attribute.__closure__))["func"]

796

.cell_contents)

1123

797

# Create a new, but exactly alike, function

1124

798

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

1125

799

# with the alternate D-Bus interface name

1126

if sys.version == 2:

1127

new_function = types.FunctionType(

1128

nonmethod_func.func_code,

1129

nonmethod_func.func_globals,

1130

nonmethod_func.func_name,

1131

nonmethod_func.func_defaults,

1132

nonmethod_func.func_closure)

1133

else:

1134

new_function = types.FunctionType(

1135

nonmethod_func.__code__,

1136

nonmethod_func.__globals__,

1137

nonmethod_func.__name__,

1138

nonmethod_func.__defaults__,

1139

nonmethod_func.__closure__)

1140

new_function = (dbus.service.signal(

1141

alt_interface,

1142

attribute._dbus_signature)(new_function))

1143

# Copy annotations, if any

1144

try:

1145

new_function._dbus_annotations = dict(

1146

attribute._dbus_annotations)

1147

except AttributeError:

1148

pass

800

new_function = (dbus.service.signal

801

(alt_interface,

802

attribute._dbus_signature)

803

(types.FunctionType(

804

nonmethod_func.func_code,

805

nonmethod_func.func_globals,

806

nonmethod_func.func_name,

807

nonmethod_func.func_defaults,

808

nonmethod_func.func_closure)))

1149

809

# Define a creator of a function to call both the

1150

# original and alternate functions, so both the

1151

# original and alternate signals gets sent when

1152

# the function is called

810

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

811

# signals gets sent when the function is called

1153

812

def fixscope(func1, func2):

1154

813

"""This function is a scope container to pass

1155

814

func1 and func2 to the "call_both" function

1156

815

outside of its arguments"""

1157

1158

816

def call_both(*args, **kwargs):

1159

817

"""This function will emit two D-Bus

1160

818

signals by calling func1 and func2"""

1161

819

func1(*args, **kwargs)

1162

820

func2(*args, **kwargs)

1163

1164

821

return call_both

1165

822

# Create the "call_both" function and add it to

1166

823

# the class

1167

attr[attrname] = fixscope(attribute, new_function)

824

attr[attrname] = fixscope(attribute,

825

new_function)

1168

826

# Is this a D-Bus method?

1169

827

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

1170

828

# Create a new, but exactly alike, function

1171

829

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

1172

830

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

1173

831

# to the class.

1174

attr[attrname] = (

1175

dbus.service.method(

1176

alt_interface,

1177

attribute._dbus_in_signature,

1178

attribute._dbus_out_signature)

1179

(types.FunctionType(attribute.func_code,

1180

attribute.func_globals,

1181

attribute.func_name,

1182

attribute.func_defaults,

1183

attribute.func_closure)))

1184

# Copy annotations, if any

1185

try:

1186

attr[attrname]._dbus_annotations = dict(

1187

attribute._dbus_annotations)

1188

except AttributeError:

1189

pass

832

attr[attrname] = (dbus.service.method

833

(alt_interface,

834

attribute._dbus_in_signature,

835

attribute._dbus_out_signature)

836

(types.FunctionType

837

(attribute.func_code,

838

attribute.func_globals,

839

attribute.func_name,

840

attribute.func_defaults,

841

attribute.func_closure)))

1190

842

# Is this a D-Bus property?

1191

843

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

1192

844

# Create a new, but exactly alike, function

1193

845

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

1194

846

# property with the alternate D-Bus interface

1195

847

# name. Add it to the class.

1196

attr[attrname] = (dbus_service_property(

1197

alt_interface, attribute._dbus_signature,

1198

attribute._dbus_access,

1199

attribute._dbus_get_args_options

1200

["byte_arrays"])

1201

(types.FunctionType(

1202

attribute.func_code,

1203

attribute.func_globals,

1204

attribute.func_name,

1205

attribute.func_defaults,

1206

attribute.func_closure)))

1207

# Copy annotations, if any

1208

try:

1209

attr[attrname]._dbus_annotations = dict(

1210

attribute._dbus_annotations)

1211

except AttributeError:

1212

pass

1213

# Is this a D-Bus interface?

1214

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

1215

# Create a new, but exactly alike, function

1216

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

1217

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

1218

# to the class.

1219

attr[attrname] = (

1220

dbus_interface_annotations(alt_interface)

1221

(types.FunctionType(attribute.func_code,

1222

attribute.func_globals,

1223

attribute.func_name,

1224

attribute.func_defaults,

1225

attribute.func_closure)))

1226

if deprecate:

1227

# Deprecate all alternate interfaces

1228

iname="_AlternateDBusNames_interface_annotation{}"

1229

for interface_name in interface_names:

1230

1231

@dbus_interface_annotations(interface_name)

1232

def func(self):

1233

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

1234

"true" }

1235

# Find an unused name

1236

for aname in (iname.format(i)

1237

for i in itertools.count()):

1238

if aname not in attr:

1239

attr[aname] = func

1240

break

1241

if interface_names:

1242

# Replace the class with a new subclass of it with

1243

# methods, signals, etc. as created above.

1244

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

1245

(cls, ), attr)

1246

return cls

1247

1248

return wrapper

1249

1250

1251

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

1252

"se.bsnet.fukt.Mandos"})

848

attr[attrname] = (dbus_service_property

849

(alt_interface,

850

attribute._dbus_signature,

851

attribute._dbus_access,

852

attribute

853

._dbus_get_args_options

854

["byte_arrays"])

855

(types.FunctionType

856

(attribute.func_code,

857

attribute.func_globals,

858

attribute.func_name,

859

attribute.func_defaults,

860

attribute.func_closure)))

861

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

862

1253

863

class ClientDBus(Client, DBusObjectWithProperties):

1254

864

"""A Client class using D-Bus

1255

865

1259

869

"""

1260

870

1261

871

runtime_expansions = (Client.runtime_expansions

1262

+ ("dbus_object_path", ))

1263

1264

_interface = "se.recompile.Mandos.Client"

872

+ ("dbus_object_path",))

1265

873

1266

874

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

1267

875

1268

876

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

877

self._approvals_pending = 0

1269

878

self.bus = bus

1270

879

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

1271

880

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

1272

881

# the D-Bus

1273

client_object_name = str(self.name).translate(

882

client_object_name = unicode(self.name).translate(

1274

883

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

1275

884

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

1276

self.dbus_object_path = dbus.ObjectPath(

1277

"/clients/" + client_object_name)

885

self.dbus_object_path = (dbus.ObjectPath

886

("/clients/" + client_object_name))

1278

887

DBusObjectWithProperties.__init__(self, self.bus,

1279

888

self.dbus_object_path)

1280

1281

def notifychangeproperty(transform_func, dbus_name,

1282

type_func=lambda x: x,

1283

variant_level=1,

1284

invalidate_only=False,

1285

_interface=_interface):

889

890

def notifychangeproperty(transform_func,

891

dbus_name, type_func=lambda x: x,

892

variant_level=1):

1286

893

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

1287

894

its changes to DBus.

1288

895

1289

896

transform_fun: Function that takes a value and a variant_level

1290

897

and transforms it to a D-Bus type.

1291

898

dbus_name: D-Bus name of the variable

1293

900

to the D-Bus. Default: no transform

1294

901

variant_level: D-Bus variant level. Default: 1

1295

902

"""

1296

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

1297

903

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

1298

904

def setter(self, value):

1299

905

if hasattr(self, "dbus_object_path"):

1300

906

if (not hasattr(self, attrname) or

1301

907

type_func(getattr(self, attrname, None))

1302

908

!= type_func(value)):

1303

if invalidate_only:

1304

self.PropertiesChanged(

1305

_interface, dbus.Dictionary(),

1306

dbus.Array((dbus_name, )))

1307

else:

1308

dbus_value = transform_func(

1309

type_func(value),

1310

variant_level = variant_level)

1311

self.PropertyChanged(dbus.String(dbus_name),

1312

dbus_value)

1313

self.PropertiesChanged(

1314

_interface,

1315

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

1316

dbus_value }),

1317

dbus.Array())

909

dbus_value = transform_func(type_func(value),

910

variant_level

911

=variant_level)

912

self.PropertyChanged(dbus.String(dbus_name),

913

dbus_value)

1318

914

setattr(self, attrname, value)

1319

915

1320

916

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

1321

917

918

1322

919

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1323

920

approvals_pending = notifychangeproperty(dbus.Boolean,

1324

921

"ApprovalPending",

1326

923

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

1327

924

last_enabled = notifychangeproperty(datetime_to_dbus,

1328

925

"LastEnabled")

1329

checker = notifychangeproperty(

1330

dbus.Boolean, "CheckerRunning",

1331

type_func = lambda checker: checker is not None)

926

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

927

type_func = lambda checker:

928

checker is not None)

1332

929

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1333

930

"LastCheckedOK")

1334

last_checker_status = notifychangeproperty(dbus.Int16,

1335

"LastCheckerStatus")

1336

931

last_approval_request = notifychangeproperty(

1337

932

datetime_to_dbus, "LastApprovalRequest")

1338

933

approved_by_default = notifychangeproperty(dbus.Boolean,

1339

934

"ApprovedByDefault")

1340

approval_delay = notifychangeproperty(

1341

dbus.UInt64, "ApprovalDelay",

1342

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

935

approval_delay = notifychangeproperty(dbus.UInt16,

936

"ApprovalDelay",

937

type_func =

938

_timedelta_to_milliseconds)

1343

939

approval_duration = notifychangeproperty(

1344

dbus.UInt64, "ApprovalDuration",

1345

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

940

dbus.UInt16, "ApprovalDuration",

941

type_func = _timedelta_to_milliseconds)

1346

942

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

1347

timeout = notifychangeproperty(

1348

dbus.UInt64, "Timeout",

1349

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

943

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

944

type_func =

945

_timedelta_to_milliseconds)

1350

946

extended_timeout = notifychangeproperty(

1351

dbus.UInt64, "ExtendedTimeout",

1352

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

1353

interval = notifychangeproperty(

1354

dbus.UInt64, "Interval",

1355

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

947

dbus.UInt16, "ExtendedTimeout",

948

type_func = _timedelta_to_milliseconds)

949

interval = notifychangeproperty(dbus.UInt16,

950

"Interval",

951

type_func =

952

_timedelta_to_milliseconds)

1356

953

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

1357

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

1358

invalidate_only=True)

1359

954

1360

955

del notifychangeproperty

1361

956

1388

983

*args, **kwargs)

1389

984

1390

985

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

1391

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

986

old_checker = self.checker

987

if self.checker is not None:

988

old_checker_pid = self.checker.pid

989

else:

990

old_checker_pid = None

1392

991

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

1393

992

# Only if new checker process was started

1394

993

if (self.checker is not None

1398

997

return r

1399

998

1400

999

def _reset_approved(self):

1401

self.approved = None

1000

self._approved = None

1402

1001

return False

1403

1002

1404

1003

def approve(self, value=True):

1405

self.approved = value

1406

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

1407

* 1000), self._reset_approved)

1408

1004

self.send_changedstate()

1005

self._approved = value

1006

gobject.timeout_add(_timedelta_to_milliseconds

1007

(self.approval_duration),

1008

self._reset_approved)

1009

1409

1010

1410

1011

## D-Bus methods, signals & properties

1411

1412

## Interfaces

1012

_interface = "se.recompile.Mandos.Client"

1413

1013

1414

1014

## Signals

1415

1015

1426

1026

pass

1427

1027

1428

1028

# PropertyChanged - signal

1429

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

1430

1029

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

1431

1030

def PropertyChanged(self, property, value):

1432

1031

"D-Bus signal"

1496

1095

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

1497

1096

1498

1097

# ApprovedByDefault - property

1499

@dbus_service_property(_interface,

1500

signature="b",

1098

@dbus_service_property(_interface, signature="b",

1501

1099

access="readwrite")

1502

1100

def ApprovedByDefault_dbus_property(self, value=None):

1503

1101

if value is None: # get

1505

1103

self.approved_by_default = bool(value)

1506

1104

1507

1105

# ApprovalDelay - property

1508

@dbus_service_property(_interface,

1509

signature="t",

1106

@dbus_service_property(_interface, signature="t",

1510

1107

access="readwrite")

1511

1108

def ApprovalDelay_dbus_property(self, value=None):

1512

1109

if value is None: # get

1513

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

1514

* 1000)

1110

return dbus.UInt64(self.approval_delay_milliseconds())

1515

1111

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

1516

1112

1517

1113

# ApprovalDuration - property

1518

@dbus_service_property(_interface,

1519

signature="t",

1114

@dbus_service_property(_interface, signature="t",

1520

1115

access="readwrite")

1521

1116

def ApprovalDuration_dbus_property(self, value=None):

1522

1117

if value is None: # get

1523

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

1524

* 1000)

1118

return dbus.UInt64(_timedelta_to_milliseconds(

1119

self.approval_duration))

1525

1120

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

1526

1121

1527

1122

# Name - property

1535

1130

return dbus.String(self.fingerprint)

1536

1131

1537

1132

# Host - property

1538

@dbus_service_property(_interface,

1539

signature="s",

1133

@dbus_service_property(_interface, signature="s",

1540

1134

access="readwrite")

1541

1135

def Host_dbus_property(self, value=None):

1542

1136

if value is None: # get

1543

1137

return dbus.String(self.host)

1544

self.host = str(value)

1138

self.host = value

1545

1139

1546

1140

# Created - property

1547

1141

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

1548

1142

def Created_dbus_property(self):

1549

return datetime_to_dbus(self.created)

1143

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

1550

1144

1551

1145

# LastEnabled - property

1552

1146

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

1554

1148

return datetime_to_dbus(self.last_enabled)

1555

1149

1556

1150

# Enabled - property

1557

@dbus_service_property(_interface,

1558

signature="b",

1151

@dbus_service_property(_interface, signature="b",

1559

1152

access="readwrite")

1560

1153

def Enabled_dbus_property(self, value=None):

1561

1154

if value is None: # get

1566

1159

self.disable()

1567

1160

1568

1161

# LastCheckedOK - property

1569

@dbus_service_property(_interface,

1570

signature="s",

1162

@dbus_service_property(_interface, signature="s",

1571

1163

access="readwrite")

1572

1164

def LastCheckedOK_dbus_property(self, value=None):

1573

1165

if value is not None:

1575

1167

return

1576

1168

return datetime_to_dbus(self.last_checked_ok)

1577

1169

1578

# LastCheckerStatus - property

1579

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

1580

def LastCheckerStatus_dbus_property(self):

1581

return dbus.Int16(self.last_checker_status)

1582

1583

1170

# Expires - property

1584

1171

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

1585

1172

def Expires_dbus_property(self):

1591

1178

return datetime_to_dbus(self.last_approval_request)

1592

1179

1593

1180

# Timeout - property

1594

@dbus_service_property(_interface,

1595

signature="t",

1181

@dbus_service_property(_interface, signature="t",

1596

1182

access="readwrite")

1597

1183

def Timeout_dbus_property(self, value=None):

1598

1184

if value is None: # get

1599

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

1600

old_timeout = self.timeout

1185

return dbus.UInt64(self.timeout_milliseconds())

1601

1186

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

1602

# Reschedule disabling

1603

if self.enabled:

1604

now = datetime.datetime.utcnow()

1605

self.expires += self.timeout - old_timeout

1606

if self.expires <= now:

1607

# The timeout has passed

1608

self.disable()

1609

else:

1610

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

1611

is None):

1612

return

1613

gobject.source_remove(self.disable_initiator_tag)

1614

self.disable_initiator_tag = gobject.timeout_add(

1615

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

1616

self.disable)

1187

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

1188

return

1189

# Reschedule timeout

1190

gobject.source_remove(self.disable_initiator_tag)

1191

self.disable_initiator_tag = None

1192

self.expires = None

1193

time_to_die = _timedelta_to_milliseconds((self

1194

.last_checked_ok

1195

+ self.timeout)

1196

- datetime.datetime

1197

.utcnow())

1198

if time_to_die <= 0:

1199

# The timeout has passed

1200

self.disable()

1201

else:

1202

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

1203

+ datetime.timedelta(milliseconds =

1204

time_to_die))

1205

self.disable_initiator_tag = (gobject.timeout_add

1206

(time_to_die, self.disable))

1617

1207

1618

1208

# ExtendedTimeout - property

1619

@dbus_service_property(_interface,

1620

signature="t",

1209

@dbus_service_property(_interface, signature="t",

1621

1210

access="readwrite")

1622

1211

def ExtendedTimeout_dbus_property(self, value=None):

1623

1212

if value is None: # get

1624

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

1625

* 1000)

1213

return dbus.UInt64(self.extended_timeout_milliseconds())

1626

1214

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

1627

1215

1628

1216

# Interval - property

1629

@dbus_service_property(_interface,

1630

signature="t",

1217

@dbus_service_property(_interface, signature="t",

1631

1218

access="readwrite")

1632

1219

def Interval_dbus_property(self, value=None):

1633

1220

if value is None: # get

1634

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

1221

return dbus.UInt64(self.interval_milliseconds())

1635

1222

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

1636

1223

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

1637

1224

return

1638

if self.enabled:

1639

# Reschedule checker run

1640

gobject.source_remove(self.checker_initiator_tag)

1641

self.checker_initiator_tag = gobject.timeout_add(

1642

value, self.start_checker)

1643

self.start_checker() # Start one now, too

1225

# Reschedule checker run

1226

gobject.source_remove(self.checker_initiator_tag)

1227

self.checker_initiator_tag = (gobject.timeout_add

1228

(value, self.start_checker))

1229

self.start_checker() # Start one now, too

1644

1230

1645

1231

# Checker - property

1646

@dbus_service_property(_interface,

1647

signature="s",

1232

@dbus_service_property(_interface, signature="s",

1648

1233

access="readwrite")

1649

1234

def Checker_dbus_property(self, value=None):

1650

1235

if value is None: # get

1651

1236

return dbus.String(self.checker_command)

1652

self.checker_command = str(value)

1237

self.checker_command = value

1653

1238

1654

1239

# CheckerRunning - property

1655

@dbus_service_property(_interface,

1656

signature="b",

1240

@dbus_service_property(_interface, signature="b",

1657

1241

access="readwrite")

1658

1242

def CheckerRunning_dbus_property(self, value=None):

1659

1243

if value is None: # get

1669

1253

return self.dbus_object_path # is already a dbus.ObjectPath

1670

1254

1671

1255

# Secret = property

1672

@dbus_service_property(_interface,

1673

signature="ay",

1674

access="write",

1675

byte_arrays=True)

1256

@dbus_service_property(_interface, signature="ay",

1257

access="write", byte_arrays=True)

1676

1258

def Secret_dbus_property(self, value):

1677

self.secret = bytes(value)

1259

self.secret = str(value)

1678

1260

1679

1261

del _interface

1680

1262

1684

1266

self._pipe = child_pipe

1685

1267

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

1686

1268

if not self._pipe.recv():

1687

raise KeyError(fpr)

1269

raise KeyError()

1688

1270

1689

1271

def __getattribute__(self, name):

1690

if name == '_pipe':

1272

if(name == '_pipe'):

1691

1273

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

1692

1274

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

1693

1275

data = self._pipe.recv()

1694

1276

if data[0] == 'data':

1695

1277

return data[1]

1696

1278

if data[0] == 'function':

1697

1698

1279

def func(*args, **kwargs):

1699

1280

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

1700

1281

return self._pipe.recv()[1]

1701

1702

1282

return func

1703

1283

1704

1284

def __setattr__(self, name, value):

1705

if name == '_pipe':

1285

if(name == '_pipe'):

1706

1286

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

1707

1287

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

1708

1288

1289

class ClientDBusTransitional(ClientDBus):

1290

__metaclass__ = AlternateDBusNamesMetaclass

1709

1291

1710

1292

class ClientHandler(socketserver.BaseRequestHandler, object):

1711

1293

"""A class to handle client connections.

1716

1298

def handle(self):

1717

1299

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

1718

1300

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

1719

str(self.client_address))

1301

unicode(self.client_address))

1720

1302

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

1721

1303

self.server.child_pipe.fileno())

1722

1304

1723

session = gnutls.connection.ClientSession(

1724

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

1305

session = (gnutls.connection

1306

.ClientSession(self.request,

1307

gnutls.connection

1308

.X509Credentials()))

1725

1309

1726

1310

# Note: gnutls.connection.X509Credentials is really a

1727

1311

# generic GnuTLS certificate credentials object so long as

1736

1320

priority = self.server.gnutls_priority

1737

1321

if priority is None:

1738

1322

priority = "NORMAL"

1739

gnutls.library.functions.gnutls_priority_set_direct(

1740

session._c_object, priority, None)

1323

(gnutls.library.functions

1324

.gnutls_priority_set_direct(session._c_object,

1325

priority, None))

1741

1326

1742

1327

# Start communication using the Mandos protocol

1743

1328

# Get protocol number

1745

1330

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

1746

1331

try:

1747

1332

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

1748

raise RuntimeError(line)

1333

raise RuntimeError

1749

1334

except (ValueError, IndexError, RuntimeError) as error:

1750

1335

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

1751

1336

return

1763

1348

approval_required = False

1764

1349

try:

1765

1350

try:

1766

fpr = self.fingerprint(

1767

self.peer_certificate(session))

1351

fpr = self.fingerprint(self.peer_certificate

1352

(session))

1768

1353

except (TypeError,

1769

1354

gnutls.errors.GNUTLSError) as error:

1770

1355

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

1785

1370

while True:

1786

1371

if not client.enabled:

1787

1372

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

1788

client.name)

1373

client.name)

1789

1374

if self.server.use_dbus:

1790

1375

# Emit D-Bus signal

1791

1376

client.Rejected("Disabled")

1792

1377

return

1793

1378

1794

if client.approved or not client.approval_delay:

1379

if client._approved or not client.approval_delay:

1795

1380

#We are approved or approval is disabled

1796

1381

break

1797

elif client.approved is None:

1382

elif client._approved is None:

1798

1383

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

1799

1384

client.name)

1800

1385

if self.server.use_dbus:

1801

1386

# Emit D-Bus signal

1802

1387

client.NeedApproval(

1803

client.approval_delay.total_seconds()

1804

* 1000, client.approved_by_default)

1388

client.approval_delay_milliseconds(),

1389

client.approved_by_default)

1805

1390

else:

1806

1391

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

1807

1392

client.name)

1813

1398

#wait until timeout or approved

1814

1399

time = datetime.datetime.now()

1815

1400

client.changedstate.acquire()

1816

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

1401

(client.changedstate.wait

1402

(float(client._timedelta_to_milliseconds(delay)

1403

/ 1000)))

1817

1404

client.changedstate.release()

1818

1405

time2 = datetime.datetime.now()

1819

1406

if (time2 - time) >= delay:

1835

1422

try:

1836

1423

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

1837

1424

except gnutls.errors.GNUTLSError as error:

1838

logger.warning("gnutls send failed",

1839

exc_info=error)

1425

logger.warning("gnutls send failed")

1840

1426

return

1841

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

1842

len(client.secret) - (sent_size

1843

+ sent))

1427

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

1428

sent, len(client.secret)

1429

- (sent_size + sent))

1844

1430

sent_size += sent

1845

1431

1846

1432

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

1847

1433

# bump the timeout using extended_timeout

1848

client.bump_timeout(client.extended_timeout)

1434

client.checked_ok(client.extended_timeout)

1849

1435

if self.server.use_dbus:

1850

1436

# Emit D-Bus signal

1851

1437

client.GotSecret()

1856

1442

try:

1857

1443

session.bye()

1858

1444

except gnutls.errors.GNUTLSError as error:

1859

logger.warning("GnuTLS bye failed",

1860

exc_info=error)

1445

logger.warning("GnuTLS bye failed")

1861

1446

1862

1447

@staticmethod

1863

1448

def peer_certificate(session):

1864

1449

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

1865

1450

# If not an OpenPGP certificate...

1866

if (gnutls.library.functions.gnutls_certificate_type_get(

1867

session._c_object)

1451

if (gnutls.library.functions

1452

.gnutls_certificate_type_get(session._c_object)

1868

1453

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

1869

1454

# ...do the normal thing

1870

1455

return session.peer_certificate

1884

1469

def fingerprint(openpgp):

1885

1470

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

1886

1471

# New GnuTLS "datum" with the OpenPGP public key

1887

datum = gnutls.library.types.gnutls_datum_t(

1888

ctypes.cast(ctypes.c_char_p(openpgp),

1889

ctypes.POINTER(ctypes.c_ubyte)),

1890

ctypes.c_uint(len(openpgp)))

1472

datum = (gnutls.library.types

1473

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

1474

ctypes.POINTER

1475

(ctypes.c_ubyte)),

1476

ctypes.c_uint(len(openpgp))))

1891

1477

# New empty GnuTLS certificate

1892

1478

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1893

gnutls.library.functions.gnutls_openpgp_crt_init(

1894

ctypes.byref(crt))

1479

(gnutls.library.functions

1480

.gnutls_openpgp_crt_init(ctypes.byref(crt)))

1895

1481

# Import the OpenPGP public key into the certificate

1896

gnutls.library.functions.gnutls_openpgp_crt_import(

1897

crt, ctypes.byref(datum),

1898

gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)

1482

(gnutls.library.functions

1483

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

1484

gnutls.library.constants

1485

.GNUTLS_OPENPGP_FMT_RAW))

1899

1486

# Verify the self signature in the key

1900

1487

crtverify = ctypes.c_uint()

1901

gnutls.library.functions.gnutls_openpgp_crt_verify_self(

1902

crt, 0, ctypes.byref(crtverify))

1488

(gnutls.library.functions

1489

.gnutls_openpgp_crt_verify_self(crt, 0,

1490

ctypes.byref(crtverify)))

1903

1491

if crtverify.value != 0:

1904

1492

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1905

raise gnutls.errors.CertificateSecurityError(

1906

"Verify failed")

1493

raise (gnutls.errors.CertificateSecurityError

1494

("Verify failed"))

1907

1495

# New buffer for the fingerprint

1908

1496

buf = ctypes.create_string_buffer(20)

1909

1497

buf_len = ctypes.c_size_t()

1910

1498

# Get the fingerprint from the certificate into the buffer

1911

gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint(

1912

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

1499

(gnutls.library.functions

1500

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

1501

ctypes.byref(buf_len)))

1913

1502

# Deinit the certificate

1914

1503

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1915

1504

# Convert the buffer to a Python bytestring

1916

1505

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

1917

1506

# Convert the bytestring to hexadecimal notation

1918

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

1507

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

1919

1508

return hex_fpr

1920

1509

1921

1510

1922

1511

class MultiprocessingMixIn(object):

1923

1512

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

1924

1925

1513

def sub_process_main(self, request, address):

1926

1514

try:

1927

1515

self.finish_request(request, address)

1928

except Exception:

1516

except:

1929

1517

self.handle_error(request, address)

1930

1518

self.close_request(request)

1931

1519

1932

1520

def process_request(self, request, address):

1933

1521

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

1934

1522

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

1935

args = (request, address))

1523

args = (request,

1524

address))

1936

1525

proc.start()

1937

1526

return proc

1938

1527

1939

1528

1940

1529

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1941

1530

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

1942

1943

1531

def process_request(self, request, client_address):

1944

1532

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

1945

1533

1954

1542

1955

1543

def add_pipe(self, parent_pipe, proc):

1956

1544

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

1957

raise NotImplementedError()

1545

raise NotImplementedError

1958

1546

1959

1547

1960

1548

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1966

1554

interface: None or a network interface name (string)

1967

1555

use_ipv6: Boolean; to use IPv6 or not

1968

1556

"""

1969

1970

1557

def __init__(self, server_address, RequestHandlerClass,

1971

interface=None,

1972

use_ipv6=True,

1973

socketfd=None):

1974

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

1975

creating a new one with socket.socket().

1976

"""

1558

interface=None, use_ipv6=True):

1977

1559

self.interface = interface

1978

1560

if use_ipv6:

1979

1561

self.address_family = socket.AF_INET6

1980

if socketfd is not None:

1981

# Save the file descriptor

1982

self.socketfd = socketfd

1983

# Save the original socket.socket() function

1984

self.socket_socket = socket.socket

1985

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

1986

#

1987

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

1988

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

1989

# patching socket.socket.)

1990

#

1991

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

1992

@functools.wraps(socket.socket)

1993

def socket_wrapper(*args, **kwargs):

1994

# Restore original function so subsequent calls are

1995

# not affected.

1996

socket.socket = self.socket_socket

1997

del self.socket_socket

1998

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

1999

# saved file descriptor.

2000

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

2001

# Replace socket.socket() function with wrapper

2002

socket.socket = socket_wrapper

2003

# The socketserver.TCPServer.__init__ will call

2004

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

2005

# socket_wrapper(), if socketfd was set.

2006

1562

socketserver.TCPServer.__init__(self, server_address,

2007

1563

RequestHandlerClass)

2008

2009

1564

def server_bind(self):

2010

1565

"""This overrides the normal server_bind() function

2011

1566

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

2017

1572

self.interface)

2018

1573

else:

2019

1574

try:

2020

self.socket.setsockopt(

2021

socket.SOL_SOCKET, SO_BINDTODEVICE,

2022

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

1575

self.socket.setsockopt(socket.SOL_SOCKET,

1576

SO_BINDTODEVICE,

1577

str(self.interface

1578

+ '\0'))

2023

1579

except socket.error as error:

2024

if error.errno == errno.EPERM:

2025

logger.error("No permission to bind to"

2026

" interface %s", self.interface)

2027

elif error.errno == errno.ENOPROTOOPT:

1580

if error[0] == errno.EPERM:

1581

logger.error("No permission to"

1582

" bind to interface %s",

1583

self.interface)

1584

elif error[0] == errno.ENOPROTOOPT:

2028

1585

logger.error("SO_BINDTODEVICE not available;"

2029

1586

" cannot bind to interface %s",

2030

1587

self.interface)

2031

elif error.errno == errno.ENODEV:

2032

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

2033

" cannot bind", self.interface)

2034

1588

else:

2035

1589

raise

2036

1590

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

2039

1593

if self.address_family == socket.AF_INET6:

2040

1594

any_address = "::" # in6addr_any

2041

1595

else:

2042

any_address = "0.0.0.0" # INADDR_ANY

1596

any_address = socket.INADDR_ANY

2043

1597

self.server_address = (any_address,

2044

1598

self.server_address[1])

2045

1599

elif not self.server_address[1]:

2046

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

1600

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

1601

0)

2047

1602

# if self.interface:

2048

1603

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

2049

1604

# 0, # port

2063

1618

2064

1619

Assumes a gobject.MainLoop event loop.

2065

1620

"""

2066

2067

1621

def __init__(self, server_address, RequestHandlerClass,

2068

interface=None,

2069

use_ipv6=True,

2070

clients=None,

2071

gnutls_priority=None,

2072

use_dbus=True,

2073

socketfd=None):

1622

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

1623

gnutls_priority=None, use_dbus=True):

2074

1624

self.enabled = False

2075

1625

self.clients = clients

2076

1626

if self.clients is None:

2077

self.clients = {}

1627

self.clients = set()

2078

1628

self.use_dbus = use_dbus

2079

1629

self.gnutls_priority = gnutls_priority

2080

1630

IPv6_TCPServer.__init__(self, server_address,

2081

1631

RequestHandlerClass,

2082

1632

interface = interface,

2083

use_ipv6 = use_ipv6,

2084

socketfd = socketfd)

2085

1633

use_ipv6 = use_ipv6)

2086

1634

def server_activate(self):

2087

1635

if self.enabled:

2088

1636

return socketserver.TCPServer.server_activate(self)

2092

1640

2093

1641

def add_pipe(self, parent_pipe, proc):

2094

1642

# Call "handle_ipc" for both data and EOF events

2095

gobject.io_add_watch(

2096

parent_pipe.fileno(),

2097

gobject.IO_IN | gobject.IO_HUP,

2098

functools.partial(self.handle_ipc,

2099

parent_pipe = parent_pipe,

2100

proc = proc))

1643

gobject.io_add_watch(parent_pipe.fileno(),

1644

gobject.IO_IN | gobject.IO_HUP,

1645

functools.partial(self.handle_ipc,

1646

parent_pipe =

1647

parent_pipe,

1648

proc = proc))

2101

1649

2102

def handle_ipc(self, source, condition,

2103

parent_pipe=None,

2104

proc = None,

2105

client_object=None):

1650

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

1651

proc = None, client_object=None):

1652

condition_names = {

1653

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

1654

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

1655

# blocking).

1656

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

1657

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

1658

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

1659

# broken, usually for pipes and

1660

# sockets).

1661

}

1662

conditions_string = ' | '.join(name

1663

for cond, name in

1664

condition_names.iteritems()

1665

if cond & condition)

2106

1666

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

2107

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

1667

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

2108

1668

# Wait for other process to exit

2109

1669

proc.join()

2110

1670

return False

2117

1677

fpr = request[1]

2118

1678

address = request[2]

2119

1679

2120

for c in self.clients.itervalues():

1680

for c in self.clients:

2121

1681

if c.fingerprint == fpr:

2122

1682

client = c

2123

1683

break

2131

1691

parent_pipe.send(False)

2132

1692

return False

2133

1693

2134

gobject.io_add_watch(

2135

parent_pipe.fileno(),

2136

gobject.IO_IN | gobject.IO_HUP,

2137

functools.partial(self.handle_ipc,

2138

parent_pipe = parent_pipe,

2139

proc = proc,

2140

client_object = client))

1694

gobject.io_add_watch(parent_pipe.fileno(),

1695

gobject.IO_IN | gobject.IO_HUP,

1696

functools.partial(self.handle_ipc,

1697

parent_pipe =

1698

parent_pipe,

1699

proc = proc,

1700

client_object =

1701

client))

2141

1702

parent_pipe.send(True)

2142

1703

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

2143

1704

# same fileno

2149

1710

2150

1711

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

2151

1712

funcname)(*args,

2152

**kwargs)))

1713

**kwargs)))

2153

1714

2154

1715

if command == 'getattr':

2155

1716

attrname = request[1]

2156

if isinstance(client_object.__getattribute__(attrname),

2157

collections.Callable):

2158

parent_pipe.send(('function', ))

1717

if callable(client_object.__getattribute__(attrname)):

1718

parent_pipe.send(('function',))

2159

1719

else:

2160

parent_pipe.send((

2161

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

1720

parent_pipe.send(('data', client_object

1721

.__getattribute__(attrname)))

2162

1722

2163

1723

if command == 'setattr':

2164

1724

attrname = request[1]

2168

1728

return True

2169

1729

2170

1730

2171

def rfc3339_duration_to_delta(duration):

2172

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

2173

2174

>>> rfc3339_duration_to_delta("P7D")

2175

datetime.timedelta(7)

2176

>>> rfc3339_duration_to_delta("PT60S")

2177

datetime.timedelta(0, 60)

2178

>>> rfc3339_duration_to_delta("PT60M")

2179

datetime.timedelta(0, 3600)

2180

>>> rfc3339_duration_to_delta("PT24H")

2181

datetime.timedelta(1)

2182

>>> rfc3339_duration_to_delta("P1W")

2183

datetime.timedelta(7)

2184

>>> rfc3339_duration_to_delta("PT5M30S")

2185

datetime.timedelta(0, 330)

2186

>>> rfc3339_duration_to_delta("P1DT3M20S")

2187

datetime.timedelta(1, 200)

2188

"""

2189

2190

# Parsing an RFC 3339 duration with regular expressions is not

2191

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

2192

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

2193

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

2194

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

2195

# avoid excessive use of external libraries.

2196

2197

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

2198

Token = collections.namedtuple("Token", (

2199

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

2200

# a "group" containing digits

2201

"value", # datetime.timedelta or None

2202

"followers")) # Tokens valid after this token

2203

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

2204

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

2205

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

2206

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

2207

datetime.timedelta(seconds=1),

2208

frozenset((token_end, )))

2209

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

2210

datetime.timedelta(minutes=1),

2211

frozenset((token_second, token_end)))

2212

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

2213

datetime.timedelta(hours=1),

2214

frozenset((token_minute, token_end)))

2215

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

2216

None,

2217

frozenset((token_hour, token_minute,

2218

token_second)))

2219

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

2220

datetime.timedelta(days=1),

2221

frozenset((token_time, token_end)))

2222

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

2223

datetime.timedelta(weeks=4),

2224

frozenset((token_day, token_end)))

2225

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

2226

datetime.timedelta(weeks=52),

2227

frozenset((token_month, token_end)))

2228

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

2229

datetime.timedelta(weeks=1),

2230

frozenset((token_end, )))

2231

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

2232

frozenset((token_year, token_month,

2233

token_day, token_time,

2234

token_week)))

2235

# Define starting values

2236

value = datetime.timedelta() # Value so far

2237

found_token = None

2238

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

2239

s = duration # String left to parse

2240

# Loop until end token is found

2241

while found_token is not token_end:

2242

# Search for any currently valid tokens

2243

for token in followers:

2244

match = token.regexp.match(s)

2245

if match is not None:

2246

# Token found

2247

if token.value is not None:

2248

# Value found, parse digits

2249

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

2250

# Add to value so far

2251

value += factor * token.value

2252

# Strip token from string

2253

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

2254

# Go to found token

2255

found_token = token

2256

# Set valid next tokens

2257

followers = found_token.followers

2258

break

2259

else:

2260

# No currently valid tokens were found

2261

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

2262

.format(duration))

2263

# End token found

2264

return value

2265

2266

2267

1731

def string_to_delta(interval):

2268

1732

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

2269

1733

2280

1744

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

2281

1745

datetime.timedelta(0, 330)

2282

1746

"""

2283

2284

try:

2285

return rfc3339_duration_to_delta(interval)

2286

except ValueError:

2287

pass

2288

2289

1747

timevalue = datetime.timedelta(0)

2290

1748

for s in interval.split():

2291

1749

try:

2292

suffix = s[-1]

1750

suffix = unicode(s[-1])

2293

1751

value = int(s[:-1])

2294

1752

if suffix == "d":

2295

1753

delta = datetime.timedelta(value)

2302

1760

elif suffix == "w":

2303

1761

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

2304

1762

else:

2305

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

2306

except IndexError as e:

1763

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

1764

except (ValueError, IndexError) as e:

2307

1765

raise ValueError(*(e.args))

2308

1766

timevalue += delta

2309

1767

return timevalue

2310

1768

2311

1769

1770

def if_nametoindex(interface):

1771

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

1772

1773

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

1774

global if_nametoindex

1775

try:

1776

if_nametoindex = (ctypes.cdll.LoadLibrary

1777

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

1778

.if_nametoindex)

1779

except (OSError, AttributeError):

1780

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

1781

def if_nametoindex(interface):

1782

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

1783

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

1784

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

1785

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1786

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

1787

interface))

1788

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

1789

ifreq[16:20])[0]

1790

return interface_index

1791

return if_nametoindex(interface)

1792

1793

2312

1794

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

2313

1795

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

2314

1796

2322

1804

sys.exit()

2323

1805

if not noclose:

2324

1806

# Close all standard open file descriptors

2325

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

1807

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

2326

1808

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

2327

1809

raise OSError(errno.ENODEV,

2328

"{} not a character device"

2329

.format(os.devnull))

1810

"%s not a character device"

1811

% os.path.devnull)

2330

1812

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

2331

1813

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

2332

1814

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

2341

1823

2342

1824

parser = argparse.ArgumentParser()

2343

1825

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

2344

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

1826

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

2345

1827

help="show version number and exit")

2346

1828

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

2347

1829

help="Bind to interface IF")

2353

1835

help="Run self-test")

2354

1836

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

2355

1837

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

2356

" to terminal", default=None)

1838

" to terminal")

2357

1839

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

2358

1840

help="Debug level for stdout output")

2359

1841

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

2366

1848

" files")

2367

1849

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

2368

1850

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

2369

" system bus interface", default=None)

1851

" system bus interface")

2370

1852

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

2371

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

2372

default=None)

2373

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

2374

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

2375

" state", default=None)

2376

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

2377

help="Specify a file descriptor to a network"

2378

" socket to use instead of creating one")

2379

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

2380

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

2381

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

2382

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

2383

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

2384

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

2385

default=None)

2386

1853

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

2387

1854

options = parser.parse_args()

2388

1855

2389

1856

if options.check:

2390

1857

import doctest

2391

fail_count, test_count = doctest.testmod()

2392

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

1858

doctest.testmod()

1859

sys.exit()

2393

1860

2394

1861

# Default values for config file for server-global settings

2395

1862

server_defaults = { "interface": "",

2397

1864

"port": "",

2398

1865

"debug": "False",

2399

1866

"priority":

2400

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

2401

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

1867

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

2402

1868

"servicename": "Mandos",

2403

1869

"use_dbus": "True",

2404

1870

"use_ipv6": "True",

2405

1871

"debuglevel": "",

2406

"restore": "True",

2407

"socket": "",

2408

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

2409

"foreground": "False",

2410

"zeroconf": "True",

2411

}

1872

}

2412

1873

2413

1874

# Parse config file for server-global settings

2414

1875

server_config = configparser.SafeConfigParser(server_defaults)

2415

1876

del server_defaults

2416

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

1877

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

1878

"mandos.conf"))

2417

1879

# Convert the SafeConfigParser object to a dict

2418

1880

server_settings = server_config.defaults()

2419

1881

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

2420

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

1882

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

2421

1883

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

2422

1884

option)

2423

1885

if server_settings["port"]:

2424

1886

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

2425

1887

"port")

2426

if server_settings["socket"]:

2427

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

2428

"socket")

2429

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

2430

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

2431

# happen with a supplied network socket.

2432

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

2433

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

2434

["socket"])

2435

1888

del server_config

2436

1889

2437

1890

# Override the settings from the config file with command line

2438

1891

# options, if set.

2439

1892

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

2440

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

2441

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

2442

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

1893

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

1894

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

2443

1895

value = getattr(options, option)

2444

1896

if value is not None:

2445

1897

server_settings[option] = value

2446

1898

del options

2447

1899

# Force all strings to be unicode

2448

1900

for option in server_settings.keys():

2449

if isinstance(server_settings[option], bytes):

2450

server_settings[option] = (server_settings[option]

2451

.decode("utf-8"))

2452

# Force all boolean options to be boolean

2453

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

2454

"foreground", "zeroconf"):

2455

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

2456

# Debug implies foreground

2457

if server_settings["debug"]:

2458

server_settings["foreground"] = True

1901

if type(server_settings[option]) is str:

1902

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

2459

1903

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

2460

1904

2461

1905

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

2462

1906

2463

if (not server_settings["zeroconf"]

2464

and not (server_settings["port"]

2465

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

2466

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

2467

2468

1907

# For convenience

2469

1908

debug = server_settings["debug"]

2470

1909

debuglevel = server_settings["debuglevel"]

2471

1910

use_dbus = server_settings["use_dbus"]

2472

1911

use_ipv6 = server_settings["use_ipv6"]

2473

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

2474

stored_state_file)

2475

foreground = server_settings["foreground"]

2476

zeroconf = server_settings["zeroconf"]

2477

2478

if debug:

2479

initlogger(debug, logging.DEBUG)

2480

else:

2481

if not debuglevel:

2482

initlogger(debug)

2483

else:

2484

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

2485

initlogger(debug, level)

2486

1912

2487

1913

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

2488

syslogger.setFormatter(

2489

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

2490

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

2491

server_settings["servicename"])))

1914

syslogger.setFormatter(logging.Formatter

1915

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

1916

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

1917

% server_settings["servicename"]))

2492

1918

2493

1919

# Parse config file with clients

2494

client_config = configparser.SafeConfigParser(Client

2495

.client_defaults)

1920

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

1921

"extended_timeout": "15m",

1922

"interval": "2m",

1923

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

1924

"host": "",

1925

"approval_delay": "0s",

1926

"approval_duration": "1s",

1927

}

1928

client_config = configparser.SafeConfigParser(client_defaults)

2496

1929

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

2497

1930

"clients.conf"))

2498

1931

2499

1932

global mandos_dbus_service

2500

1933

mandos_dbus_service = None

2501

1934

2502

socketfd = None

2503

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

2504

socketfd = server_settings["socket"]

2505

tcp_server = MandosServer(

2506

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

2507

ClientHandler,

2508

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

2509

use_ipv6=use_ipv6,

2510

gnutls_priority=server_settings["priority"],

2511

use_dbus=use_dbus,

2512

socketfd=socketfd)

2513

if not foreground:

2514

pidfilename = "/run/mandos.pid"

2515

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

2516

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

2517

pidfile = None

1935

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

1936

server_settings["port"]),

1937

ClientHandler,

1938

interface=(server_settings["interface"]

1939

or None),

1940

use_ipv6=use_ipv6,

1941

gnutls_priority=

1942

server_settings["priority"],

1943

use_dbus=use_dbus)

1944

if not debug:

1945

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

2518

1946

try:

2519

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

2520

except IOError as e:

2521

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

2522

exc_info=e)

1947

pidfile = open(pidfilename, "w")

1948

except IOError:

1949

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

2523

1950

2524

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

1951

try:

1952

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

1953

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

1954

except KeyError:

2525

1955

try:

2526

uid = pwd.getpwnam(name).pw_uid

2527

gid = pwd.getpwnam(name).pw_gid

2528

break

1956

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

1957

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

2529

1958

except KeyError:

2530

continue

2531

else:

2532

uid = 65534

2533

gid = 65534

1959

try:

1960

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

1961

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

1962

except KeyError:

1963

uid = 65534

1964

gid = 65534

2534

1965

try:

2535

1966

os.setgid(gid)

2536

1967

os.setuid(uid)

2537

1968

except OSError as error:

2538

if error.errno != errno.EPERM:

2539

raise

1969

if error[0] != errno.EPERM:

1970

raise error

1971

1972

if not debug and not debuglevel:

1973

syslogger.setLevel(logging.WARNING)

1974

console.setLevel(logging.WARNING)

1975

if debuglevel:

1976

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

1977

syslogger.setLevel(level)

1978

console.setLevel(level)

2540

1979

2541

1980

if debug:

2542

1981

# Enable all possible GnuTLS debugging

2549

1988

def debug_gnutls(level, string):

2550

1989

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

2551

1990

2552

gnutls.library.functions.gnutls_global_set_log_function(

2553

debug_gnutls)

1991

(gnutls.library.functions

1992

.gnutls_global_set_log_function(debug_gnutls))

2554

1993

2555

1994

# Redirect stdin so all checkers get /dev/null

2556

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

1995

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

2557

1996

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

2558

1997

if null > 2:

2559

1998

os.close(null)

1999

else:

2000

# No console logging

2001

logger.removeHandler(console)

2560

2002

2561

2003

# Need to fork before connecting to D-Bus

2562

if not foreground:

2004

if not debug:

2563

2005

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

2564

2006

daemon()

2565

2007

2566

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

2567

# need to inform gobject that threads will be used.

2568

gobject.threads_init()

2569

2570

2008

global main_loop

2571

2009

# From the Avahi example code

2572

DBusGMainLoop(set_as_default=True)

2010

DBusGMainLoop(set_as_default=True )

2573

2011

main_loop = gobject.MainLoop()

2574

2012

bus = dbus.SystemBus()

2575

2013

# End of Avahi example code

2576

2014

if use_dbus:

2577

2015

try:

2578

2016

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

2579

bus,

2580

do_not_queue=True)

2581

old_bus_name = dbus.service.BusName(

2582

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

2583

do_not_queue=True)

2584

except dbus.exceptions.DBusException as e:

2585

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

2017

bus, do_not_queue=True)

2018

old_bus_name = (dbus.service.BusName

2019

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

2020

do_not_queue=True))

2021

except dbus.exceptions.NameExistsException as e:

2022

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

2586

2023

use_dbus = False

2587

2024

server_settings["use_dbus"] = False

2588

2025

tcp_server.use_dbus = False

2589

if zeroconf:

2590

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2591

service = AvahiServiceToSyslog(

2592

name = server_settings["servicename"],

2593

servicetype = "_mandos._tcp",

2594

protocol = protocol,

2595

bus = bus)

2596

if server_settings["interface"]:

2597

service.interface = if_nametoindex(

2598

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

2026

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2027

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

2028

servicetype = "_mandos._tcp",

2029

protocol = protocol, bus = bus)

2030

if server_settings["interface"]:

2031

service.interface = (if_nametoindex

2032

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

2599

2033

2600

2034

global multiprocessing_manager

2601

2035

multiprocessing_manager = multiprocessing.Manager()

2602

2036

2603

2037

client_class = Client

2604

2038

if use_dbus:

2605

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

2606

2607

client_settings = Client.config_parser(client_config)

2608

old_client_settings = {}

2609

clients_data = {}

2610

2611

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

2612

global wnull

2613

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

2614

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

2615

# mode

2616

if debug or not foreground:

2617

wnull.close()

2618

2619

# Get client data and settings from last running state.

2620

if server_settings["restore"]:

2621

try:

2622

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

2623

clients_data, old_client_settings = pickle.load(

2624

stored_state)

2625

os.remove(stored_state_path)

2626

except IOError as e:

2627

if e.errno == errno.ENOENT:

2628

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

2629

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

2630

else:

2631

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

2632

exc_info=e)

2633

raise

2634

except EOFError as e:

2635

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

2636

"EOFError:",

2637

exc_info=e)

2638

2639

with PGPEngine() as pgp:

2640

for client_name, client in clients_data.items():

2641

# Skip removed clients

2642

if client_name not in client_settings:

2643

continue

2644

2645

# Decide which value to use after restoring saved state.

2646

# We have three different values: Old config file,

2647

# new config file, and saved state.

2648

# New config value takes precedence if it differs from old

2649

# config value, otherwise use saved state.

2650

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

2651

try:

2652

# For each value in new config, check if it

2653

# differs from the old config value (Except for

2654

# the "secret" attribute)

2655

if (name != "secret"

2656

and (value !=

2657

old_client_settings[client_name][name])):

2658

client[name] = value

2659

except KeyError:

2660

pass

2661

2662

# Clients who has passed its expire date can still be

2663

# enabled if its last checker was successful. Clients

2664

# whose checker succeeded before we stored its state is

2665

# assumed to have successfully run all checkers during

2666

# downtime.

2667

if client["enabled"]:

2668

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

2669

if not client["last_checked_ok"]:

2670

logger.warning(

2671

"disabling client {} - Client never "

2672

"performed a successful checker".format(

2673

client_name))

2674

client["enabled"] = False

2675

elif client["last_checker_status"] != 0:

2676

logger.warning(

2677

"disabling client {} - Client last"

2678

" checker failed with error code"

2679

" {}".format(

2680

client_name,

2681

client["last_checker_status"]))

2682

client["enabled"] = False

2683

else:

2684

client["expires"] = (

2685

datetime.datetime.utcnow()

2686

+ client["timeout"])

2687

logger.debug("Last checker succeeded,"

2688

" keeping {} enabled".format(

2689

client_name))

2039

client_class = functools.partial(ClientDBusTransitional,

2040

bus = bus)

2041

def client_config_items(config, section):

2042

special_settings = {

2043

"approved_by_default":

2044

lambda: config.getboolean(section,

2045

"approved_by_default"),

2046

}

2047

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

2690

2048

try:

2691

client["secret"] = pgp.decrypt(

2692

client["encrypted_secret"],

2693

client_settings[client_name]["secret"])

2694

except PGPError:

2695

# If decryption fails, we use secret from new settings

2696

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

2697

client_name))

2698

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

2699

["secret"])

2700

2701

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

2702

for client_name in (set(old_client_settings)

2703

- set(client_settings)):

2704

del clients_data[client_name]

2705

for client_name in (set(client_settings)

2706

- set(old_client_settings)):

2707

clients_data[client_name] = client_settings[client_name]

2708

2709

# Create all client objects

2710

for client_name, client in clients_data.items():

2711

tcp_server.clients[client_name] = client_class(

2712

name = client_name,

2713

settings = client,

2714

server_settings = server_settings)

2715

2049

yield (name, special_settings[name]())

2050

except KeyError:

2051

yield (name, value)

2052

2053

tcp_server.clients.update(set(

2054

client_class(name = section,

2055

config= dict(client_config_items(

2056

client_config, section)))

2057

for section in client_config.sections()))

2716

2058

if not tcp_server.clients:

2717

2059

logger.warning("No clients defined")

2718

2719

if not foreground:

2720

if pidfile is not None:

2721

pid = os.getpid()

2722

try:

2723

with pidfile:

2724

print(pid, file=pidfile)

2725

except IOError:

2726

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

2727

pidfilename, pid)

2728

del pidfile

2060

2061

if not debug:

2062

try:

2063

with pidfile:

2064

pid = os.getpid()

2065

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

2066

del pidfile

2067

except IOError:

2068

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

2069

pidfilename, pid)

2070

except NameError:

2071

# "pidfile" was never created

2072

pass

2729

2073

del pidfilename

2074

2075

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

2730

2076

2731

2077

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

2732

2078

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

2733

2079

2734

2080

if use_dbus:

2735

2736

@alternate_dbus_interfaces(

2737

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

2738

class MandosDBusService(DBusObjectWithProperties):

2081

class MandosDBusService(dbus.service.Object):

2739

2082

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

2740

2741

2083

def __init__(self):

2742

2084

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

2743

2744

2085

_interface = "se.recompile.Mandos"

2745

2086

2746

@dbus_interface_annotations(_interface)

2747

def _foo(self):

2748

return {

2749

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

2750

"false" }

2751

2752

2087

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

2753

2088

def ClientAdded(self, objpath):

2754

2089

"D-Bus signal"

2767

2102

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

2768

2103

def GetAllClients(self):

2769

2104

"D-Bus method"

2770

return dbus.Array(c.dbus_object_path for c in

2771

tcp_server.clients.itervalues())

2105

return dbus.Array(c.dbus_object_path

2106

for c in tcp_server.clients)

2772

2107

2773

2108

@dbus.service.method(_interface,

2774

2109

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

2775

2110

def GetAllClientsWithProperties(self):

2776

2111

"D-Bus method"

2777

2112

return dbus.Dictionary(

2778

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

2779

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

2113

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

2114

for c in tcp_server.clients),

2780

2115

signature="oa{sv}")

2781

2116

2782

2117

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

2783

2118

def RemoveClient(self, object_path):

2784

2119

"D-Bus method"

2785

for c in tcp_server.clients.itervalues():

2120

for c in tcp_server.clients:

2786

2121

if c.dbus_object_path == object_path:

2787

del tcp_server.clients[c.name]

2122

tcp_server.clients.remove(c)

2788

2123

c.remove_from_connection()

2789

2124

# Don't signal anything except ClientRemoved

2790

2125

c.disable(quiet=True)

2795

2130

2796

2131

del _interface

2797

2132

2798

mandos_dbus_service = MandosDBusService()

2133

class MandosDBusServiceTransitional(MandosDBusService):

2134

__metaclass__ = AlternateDBusNamesMetaclass

2135

mandos_dbus_service = MandosDBusServiceTransitional()

2799

2136

2800

2137

def cleanup():

2801

2138

"Cleanup function; run on exit"

2802

if zeroconf:

2803

service.cleanup()

2139

service.cleanup()

2804

2140

2805

2141

multiprocessing.active_children()

2806

wnull.close()

2807

if not (tcp_server.clients or client_settings):

2808

return

2809

2810

# Store client before exiting. Secrets are encrypted with key

2811

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

2812

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

2813

clients = {}

2814

with PGPEngine() as pgp:

2815

for client in tcp_server.clients.itervalues():

2816

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

2817

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

2818

key)

2819

client_dict = {}

2820

2821

# A list of attributes that can not be pickled

2822

# + secret.

2823

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

2824

"checker", "server_settings" }

2825

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

2826

.Object):

2827

exclude.add(name)

2828

2829

client_dict["encrypted_secret"] = (client

2830

.encrypted_secret)

2831

for attr in client.client_structure:

2832

if attr not in exclude:

2833

client_dict[attr] = getattr(client, attr)

2834

2835

clients[client.name] = client_dict

2836

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

2837

2838

try:

2839

with tempfile.NamedTemporaryFile(

2840

mode='wb',

2841

suffix=".pickle",

2842

prefix='clients-',

2843

dir=os.path.dirname(stored_state_path),

2844

delete=False) as stored_state:

2845

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

2846

tempname = stored_state.name

2847

os.rename(tempname, stored_state_path)

2848

except (IOError, OSError) as e:

2849

if not debug:

2850

try:

2851

os.remove(tempname)

2852

except NameError:

2853

pass

2854

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

2855

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

2856

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

2857

else:

2858

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

2859

exc_info=e)

2860

raise

2861

2862

# Delete all clients, and settings from config

2863

2142

while tcp_server.clients:

2864

name, client = tcp_server.clients.popitem()

2143

client = tcp_server.clients.pop()

2865

2144

if use_dbus:

2866

2145

client.remove_from_connection()

2146

client.disable_hook = None

2867

2147

# Don't signal anything except ClientRemoved

2868

2148

client.disable(quiet=True)

2869

2149

if use_dbus:

2870

2150

# Emit D-Bus signal

2871

mandos_dbus_service.ClientRemoved(

2872

client.dbus_object_path, client.name)

2873

client_settings.clear()

2151

mandos_dbus_service.ClientRemoved(client

2152

.dbus_object_path,

2153

client.name)

2874

2154

2875

2155

atexit.register(cleanup)

2876

2156

2877

for client in tcp_server.clients.itervalues():

2157

for client in tcp_server.clients:

2878

2158

if use_dbus:

2879

2159

# Emit D-Bus signal

2880

2160

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2881

# Need to initiate checking of clients

2882

if client.enabled:

2883

client.init_checker()

2161

client.enable()

2884

2162

2885

2163

tcp_server.enable()

2886

2164

tcp_server.server_activate()

2887

2165

2888

2166

# Find out what port we got

2889

if zeroconf:

2890

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

2167

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

2891

2168

if use_ipv6:

2892

2169

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

2893

" flowinfo %d, scope_id %d",

2894

*tcp_server.socket.getsockname())

2170

" flowinfo %d, scope_id %d"

2171

% tcp_server.socket.getsockname())

2895

2172

else: # IPv4

2896

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

2897

*tcp_server.socket.getsockname())

2173

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

2174

% tcp_server.socket.getsockname())

2898

2175

2899

2176

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

2900

2177

2901

2178

try:

2902

if zeroconf:

2903

# From the Avahi example code

2904

try:

2905

service.activate()

2906

except dbus.exceptions.DBusException as error:

2907

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

2908

cleanup()

2909

sys.exit(1)

2910

# End of Avahi example code

2179

# From the Avahi example code

2180

try:

2181

service.activate()

2182

except dbus.exceptions.DBusException as error:

2183

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

2184

cleanup()

2185

sys.exit(1)

2186

# End of Avahi example code

2911

2187

2912

2188

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

2913

2189

lambda *args, **kwargs:

2917

2193

logger.debug("Starting main loop")

2918

2194

main_loop.run()

2919

2195

except AvahiError as error:

2920

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

2196

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

2921

2197

cleanup()

2922

2198

sys.exit(1)

2923

2199

except KeyboardInterrupt: