/mandos/trunk : revision 505.1.2

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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 = "1.3.1"

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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.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()

375

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException):

227

dbus.exceptions.DBusException) as e:

377

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pass

378

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self.group = None

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self.remove()

380

381

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

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

383

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

384

bad_states = {

385

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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}

234

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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241

if state in bad_states:

391

242

if bad_states[state] is not None:

392

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if error is None:

395

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

396

247

self.cleanup()

397

248

elif state == avahi.SERVER_RUNNING:

398

try:

399

self.add()

400

except dbus.exceptions.DBusException as error:

401

if (error.get_dbus_name()

402

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

403

logger.info("Local Zeroconf service name"

404

" collision.")

405

return self.rename(remove=False)

406

else:

407

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

408

self.cleanup()

409

os._exit(1)

249

self.add()

410

250

else:

411

251

if error is None:

412

252

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

413

253

else:

414

254

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

415

416

255

def activate(self):

417

256

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

418

257

if self.server is None:

422

261

follow_name_owner_changes=True),

423

262

avahi.DBUS_INTERFACE_SERVER)

424

263

self.server.connect_to_signal("StateChanged",

425

self.server_state_changed)

264

self.server_state_changed)

426

265

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

427

266

428

267

429

class AvahiServiceToSyslog(AvahiService):

430

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

431

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

432

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

433

syslogger.setFormatter(logging.Formatter(

434

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

435

.format(self.name)))

436

return ret

437

438

def call_pipe(connection, # : multiprocessing.Connection

439

func, *args, **kwargs):

440

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

441

442

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

443

return value on the provided multiprocessing.Connection.

444

"""

445

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

446

connection.close()

447

268

def _timedelta_to_milliseconds(td):

269

"Convert a datetime.timedelta() to milliseconds"

270

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

271

+ (td.seconds * 1000)

272

+ (td.microseconds // 1000))

273

448

274

class Client(object):

449

275

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

450

276

451

277

Attributes:

452

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

278

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

453

279

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

454

280

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

455

281

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

462

288

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

463

289

checker_initiator_tag: a gobject event source tag, or None

464

290

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

465

client_structure: Object describing what attributes a client has

466

and is used for storing the client at exit

467

291

current_checker_command: string; current running checker_command

292

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

468

293

disable_initiator_tag: a gobject event source tag, or None

469

294

enabled: bool()

470

295

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

473

298

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

474

299

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

475

300

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

476

last_checker_status: integer between 0 and 255 reflecting exit

477

status of last checker. -1 reflects crashed

478

checker, -2 means no checker completed yet.

479

last_checker_signal: The signal which killed the last checker, if

480

last_checker_status is -1

481

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

301

last_enabled: datetime.datetime(); (UTC)

482

302

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

483

303

D-Bus identifiers

484

304

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

485

305

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

486

306

until this client is disabled

487

extended_timeout: extra long timeout when secret has been sent

307

extended_timeout: extra long timeout when password has been sent

488

308

runtime_expansions: Allowed attributes for runtime expansion.

489

309

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

490

310

disabled, or None

491

server_settings: The server_settings dict from main()

492

311

"""

493

312

494

313

runtime_expansions = ("approval_delay", "approval_duration",

495

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

496

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

497

"last_approval_request", "last_checked_ok",

314

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

315

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

498

316

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

499

client_defaults = {

500

"timeout": "PT5M",

501

"extended_timeout": "PT15M",

502

"interval": "PT2M",

503

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

504

"host": "",

505

"approval_delay": "PT0S",

506

"approval_duration": "PT1S",

507

"approved_by_default": "True",

508

"enabled": "True",

509

}

510

511

@staticmethod

512

def config_parser(config):

513

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

514

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

515

with exceptions for any special settings as defined above.

516

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

517

value given the same arguments.

518

"""

519

settings = {}

520

for client_name in config.sections():

521

section = dict(config.items(client_name))

522

client = settings[client_name] = {}

523

524

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

525

# Reformat values from string types to Python types

526

client["approved_by_default"] = config.getboolean(

527

client_name, "approved_by_default")

528

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

529

"enabled")

530

531

# Uppercase and remove spaces from fingerprint for later

532

# comparison purposes with return value from the

533

# fingerprint() function

534

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

535

.replace(" ", ""))

536

if "secret" in section:

537

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

538

elif "secfile" in section:

539

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

540

(section["secfile"])),

541

"rb") as secfile:

542

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

543

else:

544

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

545

.format(section))

546

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

547

client["extended_timeout"] = string_to_delta(

548

section["extended_timeout"])

549

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

550

client["approval_delay"] = string_to_delta(

551

section["approval_delay"])

552

client["approval_duration"] = string_to_delta(

553

section["approval_duration"])

554

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

555

client["last_approval_request"] = None

556

client["last_checked_ok"] = None

557

client["last_checker_status"] = -2

558

559

return settings

560

561

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

317

318

def timeout_milliseconds(self):

319

"Return the 'timeout' attribute in milliseconds"

320

return _timedelta_to_milliseconds(self.timeout)

321

322

def extended_timeout_milliseconds(self):

323

"Return the 'extended_timeout' attribute in milliseconds"

324

return _timedelta_to_milliseconds(self.extended_timeout)

325

326

def interval_milliseconds(self):

327

"Return the 'interval' attribute in milliseconds"

328

return _timedelta_to_milliseconds(self.interval)

329

330

def approval_delay_milliseconds(self):

331

return _timedelta_to_milliseconds(self.approval_delay)

332

333

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

334

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

335

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

336

attribute."""

562

337

self.name = name

563

if server_settings is None:

564

server_settings = {}

565

self.server_settings = server_settings

566

# adding all client settings

567

for setting, value in settings.items():

568

setattr(self, setting, value)

569

570

if self.enabled:

571

if not hasattr(self, "last_enabled"):

572

self.last_enabled = datetime.datetime.utcnow()

573

if not hasattr(self, "expires"):

574

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

575

+ self.timeout)

576

else:

577

self.last_enabled = None

578

self.expires = None

579

338

if config is None:

339

config = {}

580

340

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

341

# Uppercase and remove spaces from fingerprint for later

342

# comparison purposes with return value from the fingerprint()

343

# function

344

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

345

.replace(" ", ""))

581

346

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

582

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

583

datetime.datetime.utcnow())

584

585

# attributes specific for this server instance

347

if "secret" in config:

348

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

349

elif "secfile" in config:

350

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

351

(config["secfile"])),

352

"rb") as secfile:

353

self.secret = secfile.read()

354

else:

355

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

356

% self.name)

357

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

358

self.created = datetime.datetime.utcnow()

359

self.enabled = False

360

self.last_approval_request = None

361

self.last_enabled = None

362

self.last_checked_ok = None

363

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

364

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

365

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

366

self.disable_hook = disable_hook

586

367

self.checker = None

587

368

self.checker_initiator_tag = None

588

369

self.disable_initiator_tag = None

370

self.expires = None

589

371

self.checker_callback_tag = None

372

self.checker_command = config["checker"]

590

373

self.current_checker_command = None

591

self.approved = None

374

self.last_connect = None

375

self._approved = None

376

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

377

True)

592

378

self.approvals_pending = 0

593

self.changedstate = multiprocessing_manager.Condition(

594

multiprocessing_manager.Lock())

595

self.client_structure = [attr

596

for attr in self.__dict__.iterkeys()

597

if not attr.startswith("_")]

598

self.client_structure.append("client_structure")

599

600

for name, t in inspect.getmembers(

601

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

602

if not name.startswith("_"):

603

self.client_structure.append(name)

379

self.approval_delay = string_to_delta(

380

config["approval_delay"])

381

self.approval_duration = string_to_delta(

382

config["approval_duration"])

383

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

604

384

605

# Send notice to process children that client state has changed

606

385

def send_changedstate(self):

607

with self.changedstate:

608

self.changedstate.notify_all()

609

386

self.changedstate.acquire()

387

self.changedstate.notify_all()

388

self.changedstate.release()

389

610

390

def enable(self):

611

391

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

612

392

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

613

393

# Already enabled

614

394

return

395

self.send_changedstate()

396

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

397

# and every interval from then on.

398

self.checker_initiator_tag = (gobject.timeout_add

399

(self.interval_milliseconds(),

400

self.start_checker))

401

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

615

402

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

403

self.disable_initiator_tag = (gobject.timeout_add

404

(self.timeout_milliseconds(),

405

self.disable))

616

406

self.enabled = True

617

407

self.last_enabled = datetime.datetime.utcnow()

618

self.init_checker()

619

self.send_changedstate()

408

# Also start a new checker *right now*.

409

self.start_checker()

620

410

621

411

def disable(self, quiet=True):

622

412

"""Disable this client."""

623

413

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

624

414

return False

625

415

if not quiet:

416

self.send_changedstate()

417

if not quiet:

626

418

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

627

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

419

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

628

420

gobject.source_remove(self.disable_initiator_tag)

629

421

self.disable_initiator_tag = None

630

422

self.expires = None

631

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

423

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

632

424

gobject.source_remove(self.checker_initiator_tag)

633

425

self.checker_initiator_tag = None

634

426

self.stop_checker()

427

if self.disable_hook:

428

self.disable_hook(self)

635

429

self.enabled = False

636

if not quiet:

637

self.send_changedstate()

638

430

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

639

431

return False

640

432

641

433

def __del__(self):

434

self.disable_hook = None

642

435

self.disable()

643

436

644

def init_checker(self):

645

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

646

# and every interval from then on.

647

if self.checker_initiator_tag is not None:

648

gobject.source_remove(self.checker_initiator_tag)

649

self.checker_initiator_tag = gobject.timeout_add(

650

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

651

self.start_checker)

652

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

653

if self.disable_initiator_tag is not None:

654

gobject.source_remove(self.disable_initiator_tag)

655

self.disable_initiator_tag = gobject.timeout_add(

656

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

657

# Also start a new checker *right now*.

658

self.start_checker()

659

660

def checker_callback(self, source, condition, connection,

661

command):

437

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

662

438

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

663

439

self.checker_callback_tag = None

664

440

self.checker = None

665

# Read return code from connection (see call_pipe)

666

returncode = connection.recv()

667

connection.close()

668

669

if returncode >= 0:

670

self.last_checker_status = returncode

671

self.last_checker_signal = None

672

if self.last_checker_status == 0:

441

if os.WIFEXITED(condition):

442

exitstatus = os.WEXITSTATUS(condition)

443

if exitstatus == 0:

673

444

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

674

445

vars(self))

675

446

self.checked_ok()

676

447

else:

677

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

448

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

449

vars(self))

678

450

else:

679

self.last_checker_status = -1

680

self.last_checker_signal = -returncode

681

451

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

682

452

vars(self))

683

return False

684

685

def checked_ok(self):

686

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

687

self.last_checked_ok = datetime.datetime.utcnow()

688

self.last_checker_status = 0

689

self.last_checker_signal = None

690

self.bump_timeout()

691

692

def bump_timeout(self, timeout=None):

693

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

453

454

def checked_ok(self, timeout=None):

455

"""Bump up the timeout for this client.

456

457

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

458

alive and well.

459

"""

694

460

if timeout is None:

695

461

timeout = self.timeout

696

if self.disable_initiator_tag is not None:

697

gobject.source_remove(self.disable_initiator_tag)

698

self.disable_initiator_tag = None

699

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

700

self.disable_initiator_tag = gobject.timeout_add(

701

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

702

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

462

self.last_checked_ok = datetime.datetime.utcnow()

463

gobject.source_remove(self.disable_initiator_tag)

464

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

465

self.disable_initiator_tag = (gobject.timeout_add

466

(_timedelta_to_milliseconds(timeout),

467

self.disable))

703

468

704

469

def need_approval(self):

705

470

self.last_approval_request = datetime.datetime.utcnow()

710

475

If a checker already exists, leave it running and do

711

476

nothing."""

712

477

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

713

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

714

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

715

# would inevitably timeout, since no checker would get a

716

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

478

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

479

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

480

# client would inevitably timeout, since no checker would get

481

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

717

482

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

718

483

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

719

484

# should be.

720

485

721

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

722

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

723

self.checker.join()

724

self.checker = None

486

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

487

try:

488

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

489

except (AttributeError, OSError) as error:

490

if (isinstance(error, OSError)

491

and error.errno != errno.ECHILD):

492

raise error

493

else:

494

if pid:

495

logger.warning("Checker was a zombie")

496

gobject.source_remove(self.checker_callback_tag)

497

self.checker_callback(pid, status,

498

self.current_checker_command)

725

499

# Start a new checker if needed

726

500

if self.checker is None:

727

# Escape attributes for the shell

728

escaped_attrs = {

729

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

730

for attr in self.runtime_expansions }

731

501

try:

732

command = self.checker_command % escaped_attrs

733

except TypeError as error:

734

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

735

self.checker_command,

736

exc_info=error)

737

return True # Try again later

502

# In case checker_command has exactly one % operator

503

command = self.checker_command % self.host

504

except TypeError:

505

# Escape attributes for the shell

506

escaped_attrs = dict(

507

(attr,

508

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

509

errors=

510

'replace')))

511

for attr in

512

self.runtime_expansions)

513

514

try:

515

command = self.checker_command % escaped_attrs

516

except TypeError as error:

517

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

518

' %s', self.checker_command, error)

519

return True # Try again later

738

520

self.current_checker_command = command

739

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

740

self.name)

741

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

742

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

743

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

744

# always replaced by /dev/null.)

745

# The exception is when not debugging but nevertheless

746

# running in the foreground; use the previously

747

# created wnull.

748

popen_args = { "close_fds": True,

749

"shell": True,

750

"cwd": "/" }

751

if (not self.server_settings["debug"]

752

and self.server_settings["foreground"]):

753

popen_args.update({"stdout": wnull,

754

"stderr": wnull })

755

pipe = multiprocessing.Pipe(duplex = False)

756

self.checker = multiprocessing.Process(

757

target = call_pipe,

758

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

759

kwargs = popen_args)

760

self.checker.start()

761

self.checker_callback_tag = gobject.io_add_watch(

762

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

763

self.checker_callback, pipe[0], command)

521

try:

522

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

523

command, self.name)

524

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

525

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

526

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

527

# always replaced by /dev/null.)

528

self.checker = subprocess.Popen(command,

529

close_fds=True,

530

shell=True, cwd="/")

531

self.checker_callback_tag = (gobject.child_watch_add

532

(self.checker.pid,

533

self.checker_callback,

534

data=command))

535

# The checker may have completed before the gobject

536

# watch was added. Check for this.

537

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

538

if pid:

539

gobject.source_remove(self.checker_callback_tag)

540

self.checker_callback(pid, status, command)

541

except OSError as error:

542

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

543

error)

764

544

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

765

545

return True

766

546

772

552

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

773

553

return

774

554

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

775

self.checker.terminate()

555

try:

556

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

557

#time.sleep(0.5)

558

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

559

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

560

except OSError as error:

561

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

562

raise

776

563

self.checker = None

777

564

778

565

779

def dbus_service_property(dbus_interface,

780

signature="v",

781

access="readwrite",

782

byte_arrays=False):

566

def dbus_service_property(dbus_interface, signature="v",

567

access="readwrite", byte_arrays=False):

783

568

"""Decorators for marking methods of a DBusObjectWithProperties to

784

569

become properties on the D-Bus.

785

570

794

579

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

795

580

if byte_arrays and signature != "ay":

796

581

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

797

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

798

582

" signature %r" % signature)

799

583

def decorator(func):

800

584

func._dbus_is_property = True

801

585

func._dbus_interface = dbus_interface

806

590

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

807

591

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

808

592

return func

809

810

return decorator

811

812

813

def dbus_interface_annotations(dbus_interface):

814

"""Decorator for marking functions returning interface annotations

815

816

Usage:

817

818

@dbus_interface_annotations("org.example.Interface")

819

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

820

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

821

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

822

"false"}

823

"""

824

825

def decorator(func):

826

func._dbus_is_interface = True

827

func._dbus_interface = dbus_interface

828

func._dbus_name = dbus_interface

829

return func

830

831

return decorator

832

833

834

def dbus_annotations(annotations):

835

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

836

Usage:

837

838

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

839

"org.freedesktop.DBus.Property."

840

"EmitsChangedSignal": "false"})

841

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

842

access="r")

843

def Property_dbus_property(self):

844

return dbus.Boolean(False)

845

"""

846

847

def decorator(func):

848

func._dbus_annotations = annotations

849

return func

850

851

593

return decorator

852

594

853

595

854

596

class DBusPropertyException(dbus.exceptions.DBusException):

855

597

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

856

598

"""

857

pass

599

def __unicode__(self):

600

return unicode(str(self))

858

601

859

602

860

603

class DBusPropertyAccessException(DBusPropertyException):

878

621

"""

879

622

880

623

@staticmethod

881

def _is_dbus_thing(thing):

882

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

883

884

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

885

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

886

"""

887

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

888

False)

624

def _is_dbus_property(obj):

625

return getattr(obj, "_dbus_is_property", False)

889

626

890

def _get_all_dbus_things(self, thing):

627

def _get_all_dbus_properties(self):

891

628

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

892

629

"""

893

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

894

athing.__get__(self))

630

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

895

631

for cls in self.__class__.__mro__

896

for name, athing in

897

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

632

for name, prop in inspect.getmembers(cls, self._is_dbus_property))

898

633

899

634

def _get_dbus_property(self, interface_name, property_name):

900

635

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

901

636

property with the specified name and interface.

902

637

"""

903

for cls in self.__class__.__mro__:

904

for name, value in inspect.getmembers(

905

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

906

if (value._dbus_name == property_name

907

and value._dbus_interface == interface_name):

638

for cls in self.__class__.__mro__:

639

for name, value in inspect.getmembers(cls, self._is_dbus_property):

640

if value._dbus_name == property_name and value._dbus_interface == interface_name:

908

641

return value.__get__(self)

909

642

910

643

# No such property

911

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

912

self.dbus_object_path, interface_name, property_name))

644

raise DBusPropertyNotFound(self.dbus_object_path + ":"

645

+ interface_name + "."

646

+ property_name)

913

647

914

@dbus.service.method(dbus.PROPERTIES_IFACE,

915

in_signature="ss",

648

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

916

649

out_signature="v")

917

650

def Get(self, interface_name, property_name):

918

651

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

936

669

# The byte_arrays option is not supported yet on

937

670

# signatures other than "ay".

938

671

if prop._dbus_signature != "ay":

939

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

940

"'ay' signature {!r}"

941

.format(prop._dbus_signature))

942

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

943

for byte in value))

672

raise ValueError

673

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

674

for byte in value))

944

675

prop(value)

945

676

946

@dbus.service.method(dbus.PROPERTIES_IFACE,

947

in_signature="s",

677

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

948

678

out_signature="a{sv}")

949

679

def GetAll(self, interface_name):

950

680

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

952

682

953

683

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

954

684

"""

955

properties = {}

956

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

685

all = {}

686

for name, prop in self._get_all_dbus_properties():

957

687

if (interface_name

958

688

and interface_name != prop._dbus_interface):

959

689

# Interface non-empty but did not match

963

693

continue

964

694

value = prop()

965

695

if not hasattr(value, "variant_level"):

966

properties[name] = value

696

all[name] = value

967

697

continue

968

properties[name] = type(value)(

969

value, variant_level = value.variant_level + 1)

970

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

971

972

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

973

def PropertiesChanged(self, interface_name, changed_properties,

974

invalidated_properties):

975

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

976

standard.

977

"""

978

pass

698

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

699

value.variant_level+1)

700

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

979

701

980

702

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

981

703

out_signature="s",

982

704

path_keyword='object_path',

983

705

connection_keyword='connection')

984

706

def Introspect(self, object_path, connection):

985

"""Overloading of standard D-Bus method.

986

987

Inserts property tags and interface annotation tags.

707

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

988

708

"""

989

709

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

990

710

connection)

991

711

try:

992

712

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

993

994

713

def make_tag(document, name, prop):

995

714

e = document.createElement("property")

996

715

e.setAttribute("name", name)

997

716

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

998

717

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

999

718

return e

1000

1001

719

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

1002

# Add property tags

1003

720

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

1004

721

for name, prop

1005

in self._get_all_dbus_things("property")

722

in self._get_all_dbus_properties()

1006

723

if prop._dbus_interface

1007

724

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

1008

725

if_tag.appendChild(tag)

1009

# Add annotation tags

1010

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

1011

for tag in if_tag.getElementsByTagName(typ):

1012

annots = dict()

1013

for name, prop in (self.

1014

_get_all_dbus_things(typ)):

1015

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

1016

and prop._dbus_interface

1017

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

1018

annots.update(getattr(

1019

prop, "_dbus_annotations", {}))

1020

for name, value in annots.items():

1021

ann_tag = document.createElement(

1022

"annotation")

1023

ann_tag.setAttribute("name", name)

1024

ann_tag.setAttribute("value", value)

1025

tag.appendChild(ann_tag)

1026

# Add interface annotation tags

1027

for annotation, value in dict(

1028

itertools.chain.from_iterable(

1029

annotations().items()

1030

for name, annotations

1031

in self._get_all_dbus_things("interface")

1032

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

1033

)).items():

1034

ann_tag = document.createElement("annotation")

1035

ann_tag.setAttribute("name", annotation)

1036

ann_tag.setAttribute("value", value)

1037

if_tag.appendChild(ann_tag)

1038

726

# Add the names to the return values for the

1039

727

# "org.freedesktop.DBus.Properties" methods

1040

728

if (if_tag.getAttribute("name")

1055

743

except (AttributeError, xml.dom.DOMException,

1056

744

xml.parsers.expat.ExpatError) as error:

1057

745

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

1058

exc_info=error)

746

error)

1059

747

return xmlstring

1060

748

1061

749

1062

def datetime_to_dbus(dt, variant_level=0):

750

def datetime_to_dbus (dt, variant_level=0):

1063

751

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

1064

752

if dt is None:

1065

753

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

1066

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

1067

1068

1069

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1070

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

1071

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

1072

interface names according to the "alt_interface_names" mapping.

1073

Usage:

1074

1075

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

1076

"net.example.AlternateInterface"})

1077

class SampleDBusObject(dbus.service.Object):

1078

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

1079

def SampleDBusMethod():

1080

pass

1081

1082

The above "SampleDBusMethod" on "SampleDBusObject" will be

1083

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

1084

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

1085

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

1086

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

1087

1088

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

1089

(from DBusObjectWithProperties) and interfaces (from the

1090

dbus_interface_annotations decorator).

754

return dbus.String(dt.isoformat(),

755

variant_level=variant_level)

756

757

class AlternateDBusNamesMetaclass(DBusObjectWithProperties.__metaclass__):

758

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

759

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

1091

760

"""

1092

1093

def wrapper(cls):

1094

for orig_interface_name, alt_interface_name in (

1095

alt_interface_names.items()):

1096

attr = {}

1097

interface_names = set()

1098

# Go though all attributes of the class

1099

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

761

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

762

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

763

# methods, signals, or properties in them

764

for base in (b for b in bases

765

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

766

# Go though all attributes of the base class

767

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

1100

768

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

1101

769

# with the wrong interface name

1102

770

if (not hasattr(attribute, "_dbus_interface")

1103

or not attribute._dbus_interface.startswith(

1104

orig_interface_name)):

771

or not attribute._dbus_interface

772

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

1105

773

continue

1106

774

# Create an alternate D-Bus interface name based on

1107

775

# the current name

1108

alt_interface = attribute._dbus_interface.replace(

1109

orig_interface_name, alt_interface_name)

1110

interface_names.add(alt_interface)

776

alt_interface = (attribute._dbus_interface

777

.replace("se.recompile.Mandos",

778

"se.bsnet.fukt.Mandos"))

1111

779

# Is this a D-Bus signal?

1112

780

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

1113

if sys.version_info.major == 2:

1114

# Extract the original non-method undecorated

1115

# function by black magic

1116

nonmethod_func = (dict(

781

# Extract the original non-method function by

782

# black magic

783

nonmethod_func = (dict(

1117

784

zip(attribute.func_code.co_freevars,

1118

attribute.__closure__))

1119

["func"].cell_contents)

1120

else:

1121

nonmethod_func = attribute

785

attribute.__closure__))["func"]

786

.cell_contents)

1122

787

# Create a new, but exactly alike, function

1123

788

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

1124

789

# with the alternate D-Bus interface name

1125

if sys.version_info.major == 2:

1126

new_function = types.FunctionType(

1127

nonmethod_func.func_code,

1128

nonmethod_func.func_globals,

1129

nonmethod_func.func_name,

1130

nonmethod_func.func_defaults,

1131

nonmethod_func.func_closure)

1132

else:

1133

new_function = types.FunctionType(

1134

nonmethod_func.__code__,

1135

nonmethod_func.__globals__,

1136

nonmethod_func.__name__,

1137

nonmethod_func.__defaults__,

1138

nonmethod_func.__closure__)

1139

new_function = (dbus.service.signal(

1140

alt_interface,

1141

attribute._dbus_signature)(new_function))

1142

# Copy annotations, if any

1143

try:

1144

new_function._dbus_annotations = dict(

1145

attribute._dbus_annotations)

1146

except AttributeError:

1147

pass

790

new_function = (dbus.service.signal

791

(alt_interface,

792

attribute._dbus_signature)

793

(types.FunctionType(

794

nonmethod_func.func_code,

795

nonmethod_func.func_globals,

796

nonmethod_func.func_name,

797

nonmethod_func.func_defaults,

798

nonmethod_func.func_closure)))

1148

799

# Define a creator of a function to call both the

1149

# original and alternate functions, so both the

1150

# original and alternate signals gets sent when

1151

# the function is called

800

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

801

# signals gets sent when the function is called

1152

802

def fixscope(func1, func2):

1153

803

"""This function is a scope container to pass

1154

804

func1 and func2 to the "call_both" function

1155

805

outside of its arguments"""

1156

1157

806

def call_both(*args, **kwargs):

1158

807

"""This function will emit two D-Bus

1159

808

signals by calling func1 and func2"""

1160

809

func1(*args, **kwargs)

1161

810

func2(*args, **kwargs)

1162

1163

811

return call_both

1164

812

# Create the "call_both" function and add it to

1165

813

# the class

1166

attr[attrname] = fixscope(attribute, new_function)

814

attr[attrname] = fixscope(attribute,

815

new_function)

1167

816

# Is this a D-Bus method?

1168

817

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

1169

818

# Create a new, but exactly alike, function

1170

819

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

1171

820

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

1172

821

# to the class.

1173

attr[attrname] = (

1174

dbus.service.method(

1175

alt_interface,

1176

attribute._dbus_in_signature,

1177

attribute._dbus_out_signature)

1178

(types.FunctionType(attribute.func_code,

1179

attribute.func_globals,

1180

attribute.func_name,

1181

attribute.func_defaults,

1182

attribute.func_closure)))

1183

# Copy annotations, if any

1184

try:

1185

attr[attrname]._dbus_annotations = dict(

1186

attribute._dbus_annotations)

1187

except AttributeError:

1188

pass

822

attr[attrname] = (dbus.service.method

823

(alt_interface,

824

attribute._dbus_in_signature,

825

attribute._dbus_out_signature)

826

(types.FunctionType

827

(attribute.func_code,

828

attribute.func_globals,

829

attribute.func_name,

830

attribute.func_defaults,

831

attribute.func_closure)))

1189

832

# Is this a D-Bus property?

1190

833

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

1191

834

# Create a new, but exactly alike, function

1192

835

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

1193

836

# property with the alternate D-Bus interface

1194

837

# name. Add it to the class.

1195

attr[attrname] = (dbus_service_property(

1196

alt_interface, attribute._dbus_signature,

1197

attribute._dbus_access,

1198

attribute._dbus_get_args_options

1199

["byte_arrays"])

1200

(types.FunctionType(

1201

attribute.func_code,

1202

attribute.func_globals,

1203

attribute.func_name,

1204

attribute.func_defaults,

1205

attribute.func_closure)))

1206

# Copy annotations, if any

1207

try:

1208

attr[attrname]._dbus_annotations = dict(

1209

attribute._dbus_annotations)

1210

except AttributeError:

1211

pass

1212

# Is this a D-Bus interface?

1213

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

1214

# Create a new, but exactly alike, function

1215

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

1216

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

1217

# to the class.

1218

attr[attrname] = (

1219

dbus_interface_annotations(alt_interface)

1220

(types.FunctionType(attribute.func_code,

1221

attribute.func_globals,

1222

attribute.func_name,

1223

attribute.func_defaults,

1224

attribute.func_closure)))

1225

if deprecate:

1226

# Deprecate all alternate interfaces

1227

iname="_AlternateDBusNames_interface_annotation{}"

1228

for interface_name in interface_names:

1229

1230

@dbus_interface_annotations(interface_name)

1231

def func(self):

1232

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

1233

"true" }

1234

# Find an unused name

1235

for aname in (iname.format(i)

1236

for i in itertools.count()):

1237

if aname not in attr:

1238

attr[aname] = func

1239

break

1240

if interface_names:

1241

# Replace the class with a new subclass of it with

1242

# methods, signals, etc. as created above.

1243

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

1244

(cls, ), attr)

1245

return cls

1246

1247

return wrapper

1248

1249

1250

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

1251

"se.bsnet.fukt.Mandos"})

838

attr[attrname] = (dbus_service_property

839

(alt_interface,

840

attribute._dbus_signature,

841

attribute._dbus_access,

842

attribute

843

._dbus_get_args_options

844

["byte_arrays"])

845

(types.FunctionType

846

(attribute.func_code,

847

attribute.func_globals,

848

attribute.func_name,

849

attribute.func_defaults,

850

attribute.func_closure)))

851

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

852

1252

853

class ClientDBus(Client, DBusObjectWithProperties):

1253

854

"""A Client class using D-Bus

1254

855

1258

859

"""

1259

860

1260

861

runtime_expansions = (Client.runtime_expansions

1261

+ ("dbus_object_path", ))

1262

1263

_interface = "se.recompile.Mandos.Client"

862

+ ("dbus_object_path",))

1264

863

1265

864

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

1266

865

1267

866

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

867

self._approvals_pending = 0

1268

868

self.bus = bus

1269

869

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

1270

870

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

1271

871

# the D-Bus

1272

client_object_name = str(self.name).translate(

872

client_object_name = unicode(self.name).translate(

1273

873

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

1274

874

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

1275

self.dbus_object_path = dbus.ObjectPath(

1276

"/clients/" + client_object_name)

875

self.dbus_object_path = (dbus.ObjectPath

876

("/clients/" + client_object_name))

1277

877

DBusObjectWithProperties.__init__(self, self.bus,

1278

878

self.dbus_object_path)

1279

1280

def notifychangeproperty(transform_func, dbus_name,

1281

type_func=lambda x: x,

1282

variant_level=1,

1283

invalidate_only=False,

1284

_interface=_interface):

879

880

def notifychangeproperty(transform_func,

881

dbus_name, type_func=lambda x: x,

882

variant_level=1):

1285

883

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

1286

884

its changes to DBus.

1287

1288

transform_fun: Function that takes a value and a variant_level

1289

and transforms it to a D-Bus type.

885

886

transform_fun: Function that takes a value and transforms it

887

to a D-Bus type.

1290

888

dbus_name: D-Bus name of the variable

1291

889

type_func: Function that transform the value before sending it

1292

890

to the D-Bus. Default: no transform

1293

891

variant_level: D-Bus variant level. Default: 1

1294

892

"""

1295

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

1296

893

real_value = [None,]

1297

894

def setter(self, value):

895

old_value = real_value[0]

896

real_value[0] = value

1298

897

if hasattr(self, "dbus_object_path"):

1299

if (not hasattr(self, attrname) or

1300

type_func(getattr(self, attrname, None))

1301

!= type_func(value)):

1302

if invalidate_only:

1303

self.PropertiesChanged(

1304

_interface, dbus.Dictionary(),

1305

dbus.Array((dbus_name, )))

1306

else:

1307

dbus_value = transform_func(

1308

type_func(value),

1309

variant_level = variant_level)

1310

self.PropertyChanged(dbus.String(dbus_name),

1311

dbus_value)

1312

self.PropertiesChanged(

1313

_interface,

1314

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

1315

dbus_value }),

1316

dbus.Array())

1317

setattr(self, attrname, value)

898

if type_func(old_value) != type_func(real_value[0]):

899

dbus_value = transform_func(type_func(real_value[0]),

900

variant_level)

901

self.PropertyChanged(dbus.String(dbus_name),

902

dbus_value)

1318

903

1319

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

904

return property(lambda self: real_value[0], setter)

905

1320

906

1321

907

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1322

908

approvals_pending = notifychangeproperty(dbus.Boolean,

1325

911

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

1326

912

last_enabled = notifychangeproperty(datetime_to_dbus,

1327

913

"LastEnabled")

1328

checker = notifychangeproperty(

1329

dbus.Boolean, "CheckerRunning",

1330

type_func = lambda checker: checker is not None)

914

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

915

type_func = lambda checker: checker is not None)

1331

916

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1332

917

"LastCheckedOK")

1333

last_checker_status = notifychangeproperty(dbus.Int16,

1334

"LastCheckerStatus")

1335

last_approval_request = notifychangeproperty(

1336

datetime_to_dbus, "LastApprovalRequest")

918

last_approval_request = notifychangeproperty(datetime_to_dbus,

919

"LastApprovalRequest")

1337

920

approved_by_default = notifychangeproperty(dbus.Boolean,

1338

921

"ApprovedByDefault")

1339

approval_delay = notifychangeproperty(

1340

dbus.UInt64, "ApprovalDelay",

1341

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

1342

approval_duration = notifychangeproperty(

1343

dbus.UInt64, "ApprovalDuration",

1344

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

922

approval_delay = notifychangeproperty(dbus.UInt16, "ApprovalDelay",

923

type_func = _timedelta_to_milliseconds)

924

approval_duration = notifychangeproperty(dbus.UInt16, "ApprovalDuration",

925

type_func = _timedelta_to_milliseconds)

1345

926

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

1346

timeout = notifychangeproperty(

1347

dbus.UInt64, "Timeout",

1348

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

1349

extended_timeout = notifychangeproperty(

1350

dbus.UInt64, "ExtendedTimeout",

1351

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

1352

interval = notifychangeproperty(

1353

dbus.UInt64, "Interval",

1354

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

927

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

928

type_func = _timedelta_to_milliseconds)

929

extended_timeout = notifychangeproperty(dbus.UInt16, "ExtendedTimeout",

930

type_func = _timedelta_to_milliseconds)

931

interval = notifychangeproperty(dbus.UInt16, "Interval",

932

type_func = _timedelta_to_milliseconds)

1355

933

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

1356

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

1357

invalidate_only=True)

1358

934

1359

935

del notifychangeproperty

1360

936

1367

943

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

1368

944

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

1369

945

1370

def checker_callback(self, source, condition,

1371

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

1372

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

1373

connection, command, *args,

1374

**kwargs)

1375

exitstatus = self.last_checker_status

1376

if exitstatus >= 0:

946

def checker_callback(self, pid, condition, command,

947

*args, **kwargs):

948

self.checker_callback_tag = None

949

self.checker = None

950

if os.WIFEXITED(condition):

951

exitstatus = os.WEXITSTATUS(condition)

1377

952

# Emit D-Bus signal

1378

953

self.CheckerCompleted(dbus.Int16(exitstatus),

1379

dbus.Int64(0),

954

dbus.Int64(condition),

1380

955

dbus.String(command))

1381

956

else:

1382

957

# Emit D-Bus signal

1383

958

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

1384

dbus.Int64(

1385

self.last_checker_signal),

959

dbus.Int64(condition),

1386

960

dbus.String(command))

1387

return ret

961

962

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

963

*args, **kwargs)

1388

964

1389

965

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

1390

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

966

old_checker = self.checker

967

if self.checker is not None:

968

old_checker_pid = self.checker.pid

969

else:

970

old_checker_pid = None

1391

971

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

1392

972

# Only if new checker process was started

1393

973

if (self.checker is not None

1397

977

return r

1398

978

1399

979

def _reset_approved(self):

1400

self.approved = None

980

self._approved = None

1401

981

return False

1402

982

1403

983

def approve(self, value=True):

1404

self.approved = value

1405

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

1406

* 1000), self._reset_approved)

1407

984

self.send_changedstate()

985

self._approved = value

986

gobject.timeout_add(_timedelta_to_milliseconds

987

(self.approval_duration),

988

self._reset_approved)

989

1408

990

1409

991

## D-Bus methods, signals & properties

1410

1411

## Interfaces

992

_interface = "se.recompile.Mandos.Client"

1412

993

1413

994

## Signals

1414

995

1425

1006

pass

1426

1007

1427

1008

# PropertyChanged - signal

1428

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

1429

1009

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

1430

1010

def PropertyChanged(self, property, value):

1431

1011

"D-Bus signal"

1495

1075

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

1496

1076

1497

1077

# ApprovedByDefault - property

1498

@dbus_service_property(_interface,

1499

signature="b",

1078

@dbus_service_property(_interface, signature="b",

1500

1079

access="readwrite")

1501

1080

def ApprovedByDefault_dbus_property(self, value=None):

1502

1081

if value is None: # get

1504

1083

self.approved_by_default = bool(value)

1505

1084

1506

1085

# ApprovalDelay - property

1507

@dbus_service_property(_interface,

1508

signature="t",

1086

@dbus_service_property(_interface, signature="t",

1509

1087

access="readwrite")

1510

1088

def ApprovalDelay_dbus_property(self, value=None):

1511

1089

if value is None: # get

1512

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

1513

* 1000)

1090

return dbus.UInt64(self.approval_delay_milliseconds())

1514

1091

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

1515

1092

1516

1093

# ApprovalDuration - property

1517

@dbus_service_property(_interface,

1518

signature="t",

1094

@dbus_service_property(_interface, signature="t",

1519

1095

access="readwrite")

1520

1096

def ApprovalDuration_dbus_property(self, value=None):

1521

1097

if value is None: # get

1522

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

1523

* 1000)

1098

return dbus.UInt64(_timedelta_to_milliseconds(

1099

self.approval_duration))

1524

1100

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

1525

1101

1526

1102

# Name - property

1534

1110

return dbus.String(self.fingerprint)

1535

1111

1536

1112

# Host - property

1537

@dbus_service_property(_interface,

1538

signature="s",

1113

@dbus_service_property(_interface, signature="s",

1539

1114

access="readwrite")

1540

1115

def Host_dbus_property(self, value=None):

1541

1116

if value is None: # get

1542

1117

return dbus.String(self.host)

1543

self.host = str(value)

1118

self.host = value

1544

1119

1545

1120

# Created - property

1546

1121

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

1547

1122

def Created_dbus_property(self):

1548

return datetime_to_dbus(self.created)

1123

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

1549

1124

1550

1125

# LastEnabled - property

1551

1126

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

1553

1128

return datetime_to_dbus(self.last_enabled)

1554

1129

1555

1130

# Enabled - property

1556

@dbus_service_property(_interface,

1557

signature="b",

1131

@dbus_service_property(_interface, signature="b",

1558

1132

access="readwrite")

1559

1133

def Enabled_dbus_property(self, value=None):

1560

1134

if value is None: # get

1565

1139

self.disable()

1566

1140

1567

1141

# LastCheckedOK - property

1568

@dbus_service_property(_interface,

1569

signature="s",

1142

@dbus_service_property(_interface, signature="s",

1570

1143

access="readwrite")

1571

1144

def LastCheckedOK_dbus_property(self, value=None):

1572

1145

if value is not None:

1574

1147

return

1575

1148

return datetime_to_dbus(self.last_checked_ok)

1576

1149

1577

# LastCheckerStatus - property

1578

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

1579

def LastCheckerStatus_dbus_property(self):

1580

return dbus.Int16(self.last_checker_status)

1581

1582

1150

# Expires - property

1583

1151

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

1584

1152

def Expires_dbus_property(self):

1590

1158

return datetime_to_dbus(self.last_approval_request)

1591

1159

1592

1160

# Timeout - property

1593

@dbus_service_property(_interface,

1594

signature="t",

1161

@dbus_service_property(_interface, signature="t",

1595

1162

access="readwrite")

1596

1163

def Timeout_dbus_property(self, value=None):

1597

1164

if value is None: # get

1598

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

1599

old_timeout = self.timeout

1165

return dbus.UInt64(self.timeout_milliseconds())

1600

1166

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

1601

# Reschedule disabling

1602

if self.enabled:

1603

now = datetime.datetime.utcnow()

1604

self.expires += self.timeout - old_timeout

1605

if self.expires <= now:

1606

# The timeout has passed

1607

self.disable()

1608

else:

1609

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

1610

is None):

1611

return

1612

gobject.source_remove(self.disable_initiator_tag)

1613

self.disable_initiator_tag = gobject.timeout_add(

1614

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

1615

self.disable)

1167

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

1168

return

1169

# Reschedule timeout

1170

gobject.source_remove(self.disable_initiator_tag)

1171

self.disable_initiator_tag = None

1172

self.expires = None

1173

time_to_die = (self.

1174

_timedelta_to_milliseconds((self

1175

.last_checked_ok

1176

+ self.timeout)

1177

- datetime.datetime

1178

.utcnow()))

1179

if time_to_die <= 0:

1180

# The timeout has passed

1181

self.disable()

1182

else:

1183

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

1184

+ datetime.timedelta(milliseconds = time_to_die))

1185

self.disable_initiator_tag = (gobject.timeout_add

1186

(time_to_die, self.disable))

1616

1187

1617

1188

# ExtendedTimeout - property

1618

@dbus_service_property(_interface,

1619

signature="t",

1189

@dbus_service_property(_interface, signature="t",

1620

1190

access="readwrite")

1621

1191

def ExtendedTimeout_dbus_property(self, value=None):

1622

1192

if value is None: # get

1623

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

1624

* 1000)

1193

return dbus.UInt64(self.extended_timeout_milliseconds())

1625

1194

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

1626

1195

1627

1196

# Interval - property

1628

@dbus_service_property(_interface,

1629

signature="t",

1197

@dbus_service_property(_interface, signature="t",

1630

1198

access="readwrite")

1631

1199

def Interval_dbus_property(self, value=None):

1632

1200

if value is None: # get

1633

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

1201

return dbus.UInt64(self.interval_milliseconds())

1634

1202

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

1635

1203

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

1636

1204

return

1637

if self.enabled:

1638

# Reschedule checker run

1639

gobject.source_remove(self.checker_initiator_tag)

1640

self.checker_initiator_tag = gobject.timeout_add(

1641

value, self.start_checker)

1642

self.start_checker() # Start one now, too

1205

# Reschedule checker run

1206

gobject.source_remove(self.checker_initiator_tag)

1207

self.checker_initiator_tag = (gobject.timeout_add

1208

(value, self.start_checker))

1209

self.start_checker() # Start one now, too

1643

1210

1644

1211

# Checker - property

1645

@dbus_service_property(_interface,

1646

signature="s",

1212

@dbus_service_property(_interface, signature="s",

1647

1213

access="readwrite")

1648

1214

def Checker_dbus_property(self, value=None):

1649

1215

if value is None: # get

1650

1216

return dbus.String(self.checker_command)

1651

self.checker_command = str(value)

1217

self.checker_command = value

1652

1218

1653

1219

# CheckerRunning - property

1654

@dbus_service_property(_interface,

1655

signature="b",

1220

@dbus_service_property(_interface, signature="b",

1656

1221

access="readwrite")

1657

1222

def CheckerRunning_dbus_property(self, value=None):

1658

1223

if value is None: # get

1668

1233

return self.dbus_object_path # is already a dbus.ObjectPath

1669

1234

1670

1235

# Secret = property

1671

@dbus_service_property(_interface,

1672

signature="ay",

1673

access="write",

1674

byte_arrays=True)

1236

@dbus_service_property(_interface, signature="ay",

1237

access="write", byte_arrays=True)

1675

1238

def Secret_dbus_property(self, value):

1676

self.secret = bytes(value)

1239

self.secret = str(value)

1677

1240

1678

1241

del _interface

1679

1242

1683

1246

self._pipe = child_pipe

1684

1247

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

1685

1248

if not self._pipe.recv():

1686

raise KeyError(fpr)

1249

raise KeyError()

1687

1250

1688

1251

def __getattribute__(self, name):

1689

if name == '_pipe':

1252

if(name == '_pipe'):

1690

1253

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

1691

1254

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

1692

1255

data = self._pipe.recv()

1693

1256

if data[0] == 'data':

1694

1257

return data[1]

1695

1258

if data[0] == 'function':

1696

1697

1259

def func(*args, **kwargs):

1698

1260

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

1699

1261

return self._pipe.recv()[1]

1700

1701

1262

return func

1702

1263

1703

1264

def __setattr__(self, name, value):

1704

if name == '_pipe':

1265

if(name == '_pipe'):

1705

1266

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

1706

1267

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

1707

1268

1269

class ClientDBusTransitional(ClientDBus):

1270

__metaclass__ = AlternateDBusNamesMetaclass

1708

1271

1709

1272

class ClientHandler(socketserver.BaseRequestHandler, object):

1710

1273

"""A class to handle client connections.

1715

1278

def handle(self):

1716

1279

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

1717

1280

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

1718

str(self.client_address))

1281

unicode(self.client_address))

1719

1282

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

1720

1283

self.server.child_pipe.fileno())

1721

1284

1722

session = gnutls.connection.ClientSession(

1723

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

1285

session = (gnutls.connection

1286

.ClientSession(self.request,

1287

gnutls.connection

1288

.X509Credentials()))

1724

1289

1725

1290

# Note: gnutls.connection.X509Credentials is really a

1726

1291

# generic GnuTLS certificate credentials object so long as

1735

1300

priority = self.server.gnutls_priority

1736

1301

if priority is None:

1737

1302

priority = "NORMAL"

1738

gnutls.library.functions.gnutls_priority_set_direct(

1739

session._c_object, priority, None)

1303

(gnutls.library.functions

1304

.gnutls_priority_set_direct(session._c_object,

1305

priority, None))

1740

1306

1741

1307

# Start communication using the Mandos protocol

1742

1308

# Get protocol number

1744

1310

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

1745

1311

try:

1746

1312

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

1747

raise RuntimeError(line)

1313

raise RuntimeError

1748

1314

except (ValueError, IndexError, RuntimeError) as error:

1749

1315

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

1750

1316

return

1762

1328

approval_required = False

1763

1329

try:

1764

1330

try:

1765

fpr = self.fingerprint(

1766

self.peer_certificate(session))

1331

fpr = self.fingerprint(self.peer_certificate

1332

(session))

1767

1333

except (TypeError,

1768

1334

gnutls.errors.GNUTLSError) as error:

1769

1335

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

1784

1350

while True:

1785

1351

if not client.enabled:

1786

1352

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

1787

client.name)

1353

client.name)

1788

1354

if self.server.use_dbus:

1789

1355

# Emit D-Bus signal

1790

client.Rejected("Disabled")

1356

client.Rejected("Disabled")

1791

1357

return

1792

1358

1793

if client.approved or not client.approval_delay:

1359

if client._approved or not client.approval_delay:

1794

1360

#We are approved or approval is disabled

1795

1361

break

1796

elif client.approved is None:

1362

elif client._approved is None:

1797

1363

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

1798

1364

client.name)

1799

1365

if self.server.use_dbus:

1800

1366

# Emit D-Bus signal

1801

1367

client.NeedApproval(

1802

client.approval_delay.total_seconds()

1803

* 1000, client.approved_by_default)

1368

client.approval_delay_milliseconds(),

1369

client.approved_by_default)

1804

1370

else:

1805

1371

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

1806

1372

client.name)

1810

1376

return

1811

1377

1812

1378

#wait until timeout or approved

1379

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

1813

1380

time = datetime.datetime.now()

1814

1381

client.changedstate.acquire()

1815

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

1382

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

1816

1383

client.changedstate.release()

1817

1384

time2 = datetime.datetime.now()

1818

1385

if (time2 - time) >= delay:

1834

1401

try:

1835

1402

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

1836

1403

except gnutls.errors.GNUTLSError as error:

1837

logger.warning("gnutls send failed",

1838

exc_info=error)

1404

logger.warning("gnutls send failed")

1839

1405

return

1840

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

1841

len(client.secret) - (sent_size

1842

+ sent))

1406

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

1407

sent, len(client.secret)

1408

- (sent_size + sent))

1843

1409

sent_size += sent

1844

1410

1845

1411

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

1846

# bump the timeout using extended_timeout

1847

client.bump_timeout(client.extended_timeout)

1412

# bump the timeout as if seen

1413

client.checked_ok(client.extended_timeout)

1848

1414

if self.server.use_dbus:

1849

1415

# Emit D-Bus signal

1850

1416

client.GotSecret()

1855

1421

try:

1856

1422

session.bye()

1857

1423

except gnutls.errors.GNUTLSError as error:

1858

logger.warning("GnuTLS bye failed",

1859

exc_info=error)

1424

logger.warning("GnuTLS bye failed")

1860

1425

1861

1426

@staticmethod

1862

1427

def peer_certificate(session):

1863

1428

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

1864

1429

# If not an OpenPGP certificate...

1865

if (gnutls.library.functions.gnutls_certificate_type_get(

1866

session._c_object)

1430

if (gnutls.library.functions

1431

.gnutls_certificate_type_get(session._c_object)

1867

1432

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

1868

1433

# ...do the normal thing

1869

1434

return session.peer_certificate

1883

1448

def fingerprint(openpgp):

1884

1449

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

1885

1450

# New GnuTLS "datum" with the OpenPGP public key

1886

datum = gnutls.library.types.gnutls_datum_t(

1887

ctypes.cast(ctypes.c_char_p(openpgp),

1888

ctypes.POINTER(ctypes.c_ubyte)),

1889

ctypes.c_uint(len(openpgp)))

1451

datum = (gnutls.library.types

1452

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

1453

ctypes.POINTER

1454

(ctypes.c_ubyte)),

1455

ctypes.c_uint(len(openpgp))))

1890

1456

# New empty GnuTLS certificate

1891

1457

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1892

gnutls.library.functions.gnutls_openpgp_crt_init(

1893

ctypes.byref(crt))

1458

(gnutls.library.functions

1459

.gnutls_openpgp_crt_init(ctypes.byref(crt)))

1894

1460

# Import the OpenPGP public key into the certificate

1895

gnutls.library.functions.gnutls_openpgp_crt_import(

1896

crt, ctypes.byref(datum),

1897

gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)

1461

(gnutls.library.functions

1462

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

1463

gnutls.library.constants

1464

.GNUTLS_OPENPGP_FMT_RAW))

1898

1465

# Verify the self signature in the key

1899

1466

crtverify = ctypes.c_uint()

1900

gnutls.library.functions.gnutls_openpgp_crt_verify_self(

1901

crt, 0, ctypes.byref(crtverify))

1467

(gnutls.library.functions

1468

.gnutls_openpgp_crt_verify_self(crt, 0,

1469

ctypes.byref(crtverify)))

1902

1470

if crtverify.value != 0:

1903

1471

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1904

raise gnutls.errors.CertificateSecurityError(

1905

"Verify failed")

1472

raise (gnutls.errors.CertificateSecurityError

1473

("Verify failed"))

1906

1474

# New buffer for the fingerprint

1907

1475

buf = ctypes.create_string_buffer(20)

1908

1476

buf_len = ctypes.c_size_t()

1909

1477

# Get the fingerprint from the certificate into the buffer

1910

gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint(

1911

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

1478

(gnutls.library.functions

1479

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

1480

ctypes.byref(buf_len)))

1912

1481

# Deinit the certificate

1913

1482

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1914

1483

# Convert the buffer to a Python bytestring

1915

1484

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

1916

1485

# Convert the bytestring to hexadecimal notation

1917

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

1486

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

1918

1487

return hex_fpr

1919

1488

1920

1489

1921

1490

class MultiprocessingMixIn(object):

1922

1491

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

1923

1924

1492

def sub_process_main(self, request, address):

1925

1493

try:

1926

1494

self.finish_request(request, address)

1927

except Exception:

1495

except:

1928

1496

self.handle_error(request, address)

1929

1497

self.close_request(request)

1930

1498

1931

1499

def process_request(self, request, address):

1932

1500

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

1933

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

1934

args = (request, address))

1935

proc.start()

1936

return proc

1501

multiprocessing.Process(target = self.sub_process_main,

1502

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

1937

1503

1938

1504

1939

1505

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1940

1506

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

1941

1942

1507

def process_request(self, request, client_address):

1943

1508

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

1944

1509

1946

1511

"""

1947

1512

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1948

1513

1949

proc = MultiprocessingMixIn.process_request(self, request,

1950

client_address)

1514

super(MultiprocessingMixInWithPipe,

1515

self).process_request(request, client_address)

1951

1516

self.child_pipe.close()

1952

self.add_pipe(parent_pipe, proc)

1517

self.add_pipe(parent_pipe)

1953

1518

1954

def add_pipe(self, parent_pipe, proc):

1519

def add_pipe(self, parent_pipe):

1955

1520

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

1956

raise NotImplementedError()

1521

raise NotImplementedError

1957

1522

1958

1523

1959

1524

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1965

1530

interface: None or a network interface name (string)

1966

1531

use_ipv6: Boolean; to use IPv6 or not

1967

1532

"""

1968

1969

1533

def __init__(self, server_address, RequestHandlerClass,

1970

interface=None,

1971

use_ipv6=True,

1972

socketfd=None):

1973

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

1974

creating a new one with socket.socket().

1975

"""

1534

interface=None, use_ipv6=True):

1976

1535

self.interface = interface

1977

1536

if use_ipv6:

1978

1537

self.address_family = socket.AF_INET6

1979

if socketfd is not None:

1980

# Save the file descriptor

1981

self.socketfd = socketfd

1982

# Save the original socket.socket() function

1983

self.socket_socket = socket.socket

1984

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

1985

#

1986

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

1987

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

1988

# patching socket.socket.)

1989

#

1990

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

1991

@functools.wraps(socket.socket)

1992

def socket_wrapper(*args, **kwargs):

1993

# Restore original function so subsequent calls are

1994

# not affected.

1995

socket.socket = self.socket_socket

1996

del self.socket_socket

1997

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

1998

# saved file descriptor.

1999

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

2000

# Replace socket.socket() function with wrapper

2001

socket.socket = socket_wrapper

2002

# The socketserver.TCPServer.__init__ will call

2003

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

2004

# socket_wrapper(), if socketfd was set.

2005

1538

socketserver.TCPServer.__init__(self, server_address,

2006

1539

RequestHandlerClass)

2007

2008

1540

def server_bind(self):

2009

1541

"""This overrides the normal server_bind() function

2010

1542

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

2016

1548

self.interface)

2017

1549

else:

2018

1550

try:

2019

self.socket.setsockopt(

2020

socket.SOL_SOCKET, SO_BINDTODEVICE,

2021

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

1551

self.socket.setsockopt(socket.SOL_SOCKET,

1552

SO_BINDTODEVICE,

1553

str(self.interface

1554

+ '\0'))

2022

1555

except socket.error as error:

2023

if error.errno == errno.EPERM:

2024

logger.error("No permission to bind to"

2025

" interface %s", self.interface)

2026

elif error.errno == errno.ENOPROTOOPT:

1556

if error[0] == errno.EPERM:

1557

logger.error("No permission to"

1558

" bind to interface %s",

1559

self.interface)

1560

elif error[0] == errno.ENOPROTOOPT:

2027

1561

logger.error("SO_BINDTODEVICE not available;"

2028

1562

" cannot bind to interface %s",

2029

1563

self.interface)

2030

elif error.errno == errno.ENODEV:

2031

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

2032

" cannot bind", self.interface)

2033

1564

else:

2034

1565

raise

2035

1566

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

2038

1569

if self.address_family == socket.AF_INET6:

2039

1570

any_address = "::" # in6addr_any

2040

1571

else:

2041

any_address = "0.0.0.0" # INADDR_ANY

1572

any_address = socket.INADDR_ANY

2042

1573

self.server_address = (any_address,

2043

1574

self.server_address[1])

2044

1575

elif not self.server_address[1]:

2045

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

1576

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

1577

0)

2046

1578

# if self.interface:

2047

1579

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

2048

1580

# 0, # port

2062

1594

2063

1595

Assumes a gobject.MainLoop event loop.

2064

1596

"""

2065

2066

1597

def __init__(self, server_address, RequestHandlerClass,

2067

interface=None,

2068

use_ipv6=True,

2069

clients=None,

2070

gnutls_priority=None,

2071

use_dbus=True,

2072

socketfd=None):

1598

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

1599

gnutls_priority=None, use_dbus=True):

2073

1600

self.enabled = False

2074

1601

self.clients = clients

2075

1602

if self.clients is None:

2076

self.clients = {}

1603

self.clients = set()

2077

1604

self.use_dbus = use_dbus

2078

1605

self.gnutls_priority = gnutls_priority

2079

1606

IPv6_TCPServer.__init__(self, server_address,

2080

1607

RequestHandlerClass,

2081

1608

interface = interface,

2082

use_ipv6 = use_ipv6,

2083

socketfd = socketfd)

2084

1609

use_ipv6 = use_ipv6)

2085

1610

def server_activate(self):

2086

1611

if self.enabled:

2087

1612

return socketserver.TCPServer.server_activate(self)

2088

2089

1613

def enable(self):

2090

1614

self.enabled = True

2091

2092

def add_pipe(self, parent_pipe, proc):

1615

def add_pipe(self, parent_pipe):

2093

1616

# Call "handle_ipc" for both data and EOF events

2094

gobject.io_add_watch(

2095

parent_pipe.fileno(),

2096

gobject.IO_IN | gobject.IO_HUP,

2097

functools.partial(self.handle_ipc,

2098

parent_pipe = parent_pipe,

2099

proc = proc))

2100

2101

def handle_ipc(self, source, condition,

2102

parent_pipe=None,

2103

proc = None,

1617

gobject.io_add_watch(parent_pipe.fileno(),

1618

gobject.IO_IN | gobject.IO_HUP,

1619

functools.partial(self.handle_ipc,

1620

parent_pipe = parent_pipe))

1621

1622

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

2104

1623

client_object=None):

2105

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

2106

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

2107

# Wait for other process to exit

2108

proc.join()

1624

condition_names = {

1625

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

1626

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

1627

# blocking).

1628

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

1629

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

1630

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

1631

# broken, usually for pipes and

1632

# sockets).

1633

}

1634

conditions_string = ' | '.join(name

1635

for cond, name in

1636

condition_names.iteritems()

1637

if cond & condition)

1638

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

1639

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

2109

1640

return False

2110

1641

2111

1642

# Read a request from the child

2116

1647

fpr = request[1]

2117

1648

address = request[2]

2118

1649

2119

for c in self.clients.itervalues():

1650

for c in self.clients:

2120

1651

if c.fingerprint == fpr:

2121

1652

client = c

2122

1653

break

2125

1656

"dress: %s", fpr, address)

2126

1657

if self.use_dbus:

2127

1658

# Emit D-Bus signal

2128

mandos_dbus_service.ClientNotFound(fpr,

2129

address[0])

1659

mandos_dbus_service.ClientNotFound(fpr, address[0])

2130

1660

parent_pipe.send(False)

2131

1661

return False

2132

1662

2133

gobject.io_add_watch(

2134

parent_pipe.fileno(),

2135

gobject.IO_IN | gobject.IO_HUP,

2136

functools.partial(self.handle_ipc,

2137

parent_pipe = parent_pipe,

2138

proc = proc,

2139

client_object = client))

1663

gobject.io_add_watch(parent_pipe.fileno(),

1664

gobject.IO_IN | gobject.IO_HUP,

1665

functools.partial(self.handle_ipc,

1666

parent_pipe = parent_pipe,

1667

client_object = client))

2140

1668

parent_pipe.send(True)

2141

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

2142

# same fileno

1669

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

2143

1670

return False

2144

1671

if command == 'funcall':

2145

1672

funcname = request[1]

2146

1673

args = request[2]

2147

1674

kwargs = request[3]

2148

1675

2149

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

2150

funcname)(*args,

2151

**kwargs)))

1676

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

2152

1677

2153

1678

if command == 'getattr':

2154

1679

attrname = request[1]

2155

if isinstance(client_object.__getattribute__(attrname),

2156

collections.Callable):

2157

parent_pipe.send(('function', ))

1680

if callable(client_object.__getattribute__(attrname)):

1681

parent_pipe.send(('function',))

2158

1682

else:

2159

parent_pipe.send((

2160

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

1683

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

2161

1684

2162

1685

if command == 'setattr':

2163

1686

attrname = request[1]

2167

1690

return True

2168

1691

2169

1692

2170

def rfc3339_duration_to_delta(duration):

2171

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

2172

2173

>>> rfc3339_duration_to_delta("P7D")

2174

datetime.timedelta(7)

2175

>>> rfc3339_duration_to_delta("PT60S")

2176

datetime.timedelta(0, 60)

2177

>>> rfc3339_duration_to_delta("PT60M")

2178

datetime.timedelta(0, 3600)

2179

>>> rfc3339_duration_to_delta("PT24H")

2180

datetime.timedelta(1)

2181

>>> rfc3339_duration_to_delta("P1W")

2182

datetime.timedelta(7)

2183

>>> rfc3339_duration_to_delta("PT5M30S")

2184

datetime.timedelta(0, 330)

2185

>>> rfc3339_duration_to_delta("P1DT3M20S")

2186

datetime.timedelta(1, 200)

2187

"""

2188

2189

# Parsing an RFC 3339 duration with regular expressions is not

2190

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

2191

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

2192

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

2193

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

2194

# avoid excessive use of external libraries.

2195

2196

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

2197

Token = collections.namedtuple("Token", (

2198

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

2199

# a "group" containing digits

2200

"value", # datetime.timedelta or None

2201

"followers")) # Tokens valid after this token

2202

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

2203

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

2204

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

2205

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

2206

datetime.timedelta(seconds=1),

2207

frozenset((token_end, )))

2208

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

2209

datetime.timedelta(minutes=1),

2210

frozenset((token_second, token_end)))

2211

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

2212

datetime.timedelta(hours=1),

2213

frozenset((token_minute, token_end)))

2214

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

2215

None,

2216

frozenset((token_hour, token_minute,

2217

token_second)))

2218

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

2219

datetime.timedelta(days=1),

2220

frozenset((token_time, token_end)))

2221

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

2222

datetime.timedelta(weeks=4),

2223

frozenset((token_day, token_end)))

2224

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

2225

datetime.timedelta(weeks=52),

2226

frozenset((token_month, token_end)))

2227

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

2228

datetime.timedelta(weeks=1),

2229

frozenset((token_end, )))

2230

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

2231

frozenset((token_year, token_month,

2232

token_day, token_time,

2233

token_week)))

2234

# Define starting values

2235

value = datetime.timedelta() # Value so far

2236

found_token = None

2237

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

2238

s = duration # String left to parse

2239

# Loop until end token is found

2240

while found_token is not token_end:

2241

# Search for any currently valid tokens

2242

for token in followers:

2243

match = token.regexp.match(s)

2244

if match is not None:

2245

# Token found

2246

if token.value is not None:

2247

# Value found, parse digits

2248

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

2249

# Add to value so far

2250

value += factor * token.value

2251

# Strip token from string

2252

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

2253

# Go to found token

2254

found_token = token

2255

# Set valid next tokens

2256

followers = found_token.followers

2257

break

2258

else:

2259

# No currently valid tokens were found

2260

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

2261

.format(duration))

2262

# End token found

2263

return value

2264

2265

2266

1693

def string_to_delta(interval):

2267

1694

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

2268

1695

2279

1706

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

2280

1707

datetime.timedelta(0, 330)

2281

1708

"""

2282

2283

try:

2284

return rfc3339_duration_to_delta(interval)

2285

except ValueError:

2286

pass

2287

2288

1709

timevalue = datetime.timedelta(0)

2289

1710

for s in interval.split():

2290

1711

try:

2291

suffix = s[-1]

1712

suffix = unicode(s[-1])

2292

1713

value = int(s[:-1])

2293

1714

if suffix == "d":

2294

1715

delta = datetime.timedelta(value)

2301

1722

elif suffix == "w":

2302

1723

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

2303

1724

else:

2304

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

2305

except IndexError as e:

1725

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

1726

except (ValueError, IndexError) as e:

2306

1727

raise ValueError(*(e.args))

2307

1728

timevalue += delta

2308

1729

return timevalue

2309

1730

2310

1731

1732

def if_nametoindex(interface):

1733

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

1734

1735

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

1736

global if_nametoindex

1737

try:

1738

if_nametoindex = (ctypes.cdll.LoadLibrary

1739

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

1740

.if_nametoindex)

1741

except (OSError, AttributeError):

1742

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

1743

def if_nametoindex(interface):

1744

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

1745

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

1746

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

1747

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1748

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

1749

interface))

1750

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

1751

ifreq[16:20])[0]

1752

return interface_index

1753

return if_nametoindex(interface)

1754

1755

2311

1756

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

2312

1757

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

2313

1758

2321

1766

sys.exit()

2322

1767

if not noclose:

2323

1768

# Close all standard open file descriptors

2324

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

1769

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

2325

1770

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

2326

1771

raise OSError(errno.ENODEV,

2327

"{} not a character device"

2328

.format(os.devnull))

1772

"%s not a character device"

1773

% os.path.devnull)

2329

1774

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

2330

1775

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

2331

1776

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

2340

1785

2341

1786

parser = argparse.ArgumentParser()

2342

1787

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

2343

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

1788

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

2344

1789

help="show version number and exit")

2345

1790

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

2346

1791

help="Bind to interface IF")

2352

1797

help="Run self-test")

2353

1798

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

2354

1799

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

2355

" to terminal", default=None)

1800

" to terminal")

2356

1801

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

2357

1802

help="Debug level for stdout output")

2358

1803

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

2365

1810

" files")

2366

1811

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

2367

1812

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

2368

" system bus interface", default=None)

1813

" system bus interface")

2369

1814

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

2370

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

2371

default=None)

2372

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

2373

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

2374

" state", default=None)

2375

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

2376

help="Specify a file descriptor to a network"

2377

" socket to use instead of creating one")

2378

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

2379

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

2380

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

2381

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

2382

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

2383

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

2384

default=None)

2385

1815

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

2386

1816

options = parser.parse_args()

2387

1817

2388

1818

if options.check:

2389

1819

import doctest

2390

fail_count, test_count = doctest.testmod()

2391

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

1820

doctest.testmod()

1821

sys.exit()

2392

1822

2393

1823

# Default values for config file for server-global settings

2394

1824

server_defaults = { "interface": "",

2396

1826

"port": "",

2397

1827

"debug": "False",

2398

1828

"priority":

2399

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

2400

":+SIGN-DSA-SHA256",

1829

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

2401

1830

"servicename": "Mandos",

2402

1831

"use_dbus": "True",

2403

1832

"use_ipv6": "True",

2404

1833

"debuglevel": "",

2405

"restore": "True",

2406

"socket": "",

2407

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

2408

"foreground": "False",

2409

"zeroconf": "True",

2410

}

1834

}

2411

1835

2412

1836

# Parse config file for server-global settings

2413

1837

server_config = configparser.SafeConfigParser(server_defaults)

2414

1838

del server_defaults

2415

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

1839

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

1840

"mandos.conf"))

2416

1841

# Convert the SafeConfigParser object to a dict

2417

1842

server_settings = server_config.defaults()

2418

1843

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

2419

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

1844

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

2420

1845

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

2421

1846

option)

2422

1847

if server_settings["port"]:

2423

1848

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

2424

1849

"port")

2425

if server_settings["socket"]:

2426

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

2427

"socket")

2428

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

2429

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

2430

# happen with a supplied network socket.

2431

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

2432

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

2433

["socket"])

2434

1850

del server_config

2435

1851

2436

1852

# Override the settings from the config file with command line

2437

1853

# options, if set.

2438

1854

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

2439

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

2440

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

2441

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

1855

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

1856

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

2442

1857

value = getattr(options, option)

2443

1858

if value is not None:

2444

1859

server_settings[option] = value

2445

1860

del options

2446

1861

# Force all strings to be unicode

2447

1862

for option in server_settings.keys():

2448

if isinstance(server_settings[option], bytes):

2449

server_settings[option] = (server_settings[option]

2450

.decode("utf-8"))

2451

# Force all boolean options to be boolean

2452

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

2453

"foreground", "zeroconf"):

2454

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

2455

# Debug implies foreground

2456

if server_settings["debug"]:

2457

server_settings["foreground"] = True

1863

if type(server_settings[option]) is str:

1864

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

2458

1865

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

2459

1866

2460

1867

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

2461

1868

2462

if (not server_settings["zeroconf"]

2463

and not (server_settings["port"]

2464

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

2465

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

2466

2467

1869

# For convenience

2468

1870

debug = server_settings["debug"]

2469

1871

debuglevel = server_settings["debuglevel"]

2470

1872

use_dbus = server_settings["use_dbus"]

2471

1873

use_ipv6 = server_settings["use_ipv6"]

2472

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

2473

stored_state_file)

2474

foreground = server_settings["foreground"]

2475

zeroconf = server_settings["zeroconf"]

2476

2477

if debug:

2478

initlogger(debug, logging.DEBUG)

2479

else:

2480

if not debuglevel:

2481

initlogger(debug)

2482

else:

2483

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

2484

initlogger(debug, level)

2485

1874

2486

1875

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

2487

syslogger.setFormatter(

2488

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

2489

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

2490

server_settings["servicename"])))

1876

syslogger.setFormatter(logging.Formatter

1877

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

1878

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

1879

% server_settings["servicename"]))

2491

1880

2492

1881

# Parse config file with clients

2493

client_config = configparser.SafeConfigParser(Client

2494

.client_defaults)

1882

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

1883

"extended_timeout": "15m",

1884

"interval": "2m",

1885

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

1886

"host": "",

1887

"approval_delay": "0s",

1888

"approval_duration": "1s",

1889

}

1890

client_config = configparser.SafeConfigParser(client_defaults)

2495

1891

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

2496

1892

"clients.conf"))

2497

1893

2498

1894

global mandos_dbus_service

2499

1895

mandos_dbus_service = None

2500

1896

2501

socketfd = None

2502

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

2503

socketfd = server_settings["socket"]

2504

tcp_server = MandosServer(

2505

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

2506

ClientHandler,

2507

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

2508

use_ipv6=use_ipv6,

2509

gnutls_priority=server_settings["priority"],

2510

use_dbus=use_dbus,

2511

socketfd=socketfd)

2512

if not foreground:

2513

pidfilename = "/run/mandos.pid"

2514

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

2515

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

2516

pidfile = None

1897

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

1898

server_settings["port"]),

1899

ClientHandler,

1900

interface=(server_settings["interface"]

1901

or None),

1902

use_ipv6=use_ipv6,

1903

gnutls_priority=

1904

server_settings["priority"],

1905

use_dbus=use_dbus)

1906

if not debug:

1907

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

2517

1908

try:

2518

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

2519

except IOError as e:

2520

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

2521

exc_info=e)

1909

pidfile = open(pidfilename, "w")

1910

except IOError:

1911

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

2522

1912

2523

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

1913

try:

1914

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

1915

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

1916

except KeyError:

2524

1917

try:

2525

uid = pwd.getpwnam(name).pw_uid

2526

gid = pwd.getpwnam(name).pw_gid

2527

break

1918

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

1919

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

2528

1920

except KeyError:

2529

continue

2530

else:

2531

uid = 65534

2532

gid = 65534

1921

try:

1922

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

1923

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

1924

except KeyError:

1925

uid = 65534

1926

gid = 65534

2533

1927

try:

2534

1928

os.setgid(gid)

2535

1929

os.setuid(uid)

2536

1930

except OSError as error:

2537

if error.errno != errno.EPERM:

2538

raise

1931

if error[0] != errno.EPERM:

1932

raise error

1933

1934

if not debug and not debuglevel:

1935

syslogger.setLevel(logging.WARNING)

1936

console.setLevel(logging.WARNING)

1937

if debuglevel:

1938

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

1939

syslogger.setLevel(level)

1940

console.setLevel(level)

2539

1941

2540

1942

if debug:

2541

1943

# Enable all possible GnuTLS debugging

2548

1950

def debug_gnutls(level, string):

2549

1951

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

2550

1952

2551

gnutls.library.functions.gnutls_global_set_log_function(

2552

debug_gnutls)

1953

(gnutls.library.functions

1954

.gnutls_global_set_log_function(debug_gnutls))

2553

1955

2554

1956

# Redirect stdin so all checkers get /dev/null

2555

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

1957

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

2556

1958

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

2557

1959

if null > 2:

2558

1960

os.close(null)

1961

else:

1962

# No console logging

1963

logger.removeHandler(console)

2559

1964

2560

1965

# Need to fork before connecting to D-Bus

2561

if not foreground:

1966

if not debug:

2562

1967

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

2563

1968

daemon()

2564

1969

2565

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

2566

# need to inform gobject that threads will be used.

2567

gobject.threads_init()

2568

2569

1970

global main_loop

2570

1971

# From the Avahi example code

2571

DBusGMainLoop(set_as_default=True)

1972

DBusGMainLoop(set_as_default=True )

2572

1973

main_loop = gobject.MainLoop()

2573

1974

bus = dbus.SystemBus()

2574

1975

# End of Avahi example code

2575

1976

if use_dbus:

2576

1977

try:

2577

1978

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

2578

bus,

2579

do_not_queue=True)

2580

old_bus_name = dbus.service.BusName(

2581

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

2582

do_not_queue=True)

2583

except dbus.exceptions.DBusException as e:

2584

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

1979

bus, do_not_queue=True)

1980

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

1981

bus, do_not_queue=True)

1982

except dbus.exceptions.NameExistsException as e:

1983

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

2585

1984

use_dbus = False

2586

1985

server_settings["use_dbus"] = False

2587

1986

tcp_server.use_dbus = False

2588

if zeroconf:

2589

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2590

service = AvahiServiceToSyslog(

2591

name = server_settings["servicename"],

2592

servicetype = "_mandos._tcp",

2593

protocol = protocol,

2594

bus = bus)

2595

if server_settings["interface"]:

2596

service.interface = if_nametoindex(

2597

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

1987

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

1988

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

1989

servicetype = "_mandos._tcp",

1990

protocol = protocol, bus = bus)

1991

if server_settings["interface"]:

1992

service.interface = (if_nametoindex

1993

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

2598

1994

2599

1995

global multiprocessing_manager

2600

1996

multiprocessing_manager = multiprocessing.Manager()

2601

1997

2602

1998

client_class = Client

2603

1999

if use_dbus:

2604

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

2605

2606

client_settings = Client.config_parser(client_config)

2607

old_client_settings = {}

2608

clients_data = {}

2609

2610

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

2611

global wnull

2612

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

2613

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

2614

# mode

2615

if debug or not foreground:

2616

wnull.close()

2617

2618

# Get client data and settings from last running state.

2619

if server_settings["restore"]:

2620

try:

2621

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

2622

clients_data, old_client_settings = pickle.load(

2623

stored_state)

2624

os.remove(stored_state_path)

2625

except IOError as e:

2626

if e.errno == errno.ENOENT:

2627

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

2628

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

2629

else:

2630

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

2631

exc_info=e)

2632

raise

2633

except EOFError as e:

2634

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

2635

"EOFError:",

2636

exc_info=e)

2637

2638

with PGPEngine() as pgp:

2639

for client_name, client in clients_data.items():

2640

# Skip removed clients

2641

if client_name not in client_settings:

2642

continue

2643

2644

# Decide which value to use after restoring saved state.

2645

# We have three different values: Old config file,

2646

# new config file, and saved state.

2647

# New config value takes precedence if it differs from old

2648

# config value, otherwise use saved state.

2649

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

2650

try:

2651

# For each value in new config, check if it

2652

# differs from the old config value (Except for

2653

# the "secret" attribute)

2654

if (name != "secret"

2655

and (value !=

2656

old_client_settings[client_name][name])):

2657

client[name] = value

2658

except KeyError:

2659

pass

2660

2661

# Clients who has passed its expire date can still be

2662

# enabled if its last checker was successful. A Client

2663

# whose checker succeeded before we stored its state is

2664

# assumed to have successfully run all checkers during

2665

# downtime.

2666

if client["enabled"]:

2667

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

2668

if not client["last_checked_ok"]:

2669

logger.warning(

2670

"disabling client {} - Client never "

2671

"performed a successful checker".format(

2672

client_name))

2673

client["enabled"] = False

2674

elif client["last_checker_status"] != 0:

2675

logger.warning(

2676

"disabling client {} - Client last"

2677

" checker failed with error code"

2678

" {}".format(

2679

client_name,

2680

client["last_checker_status"]))

2681

client["enabled"] = False

2682

else:

2683

client["expires"] = (

2684

datetime.datetime.utcnow()

2685

+ client["timeout"])

2686

logger.debug("Last checker succeeded,"

2687

" keeping {} enabled".format(

2688

client_name))

2000

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

2001

def client_config_items(config, section):

2002

special_settings = {

2003

"approved_by_default":

2004

lambda: config.getboolean(section,

2005

"approved_by_default"),

2006

}

2007

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

2689

2008

try:

2690

client["secret"] = pgp.decrypt(

2691

client["encrypted_secret"],

2692

client_settings[client_name]["secret"])

2693

except PGPError:

2694

# If decryption fails, we use secret from new settings

2695

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

2696

client_name))

2697

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

2698

["secret"])

2699

2700

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

2701

for client_name in (set(old_client_settings)

2702

- set(client_settings)):

2703

del clients_data[client_name]

2704

for client_name in (set(client_settings)

2705

- set(old_client_settings)):

2706

clients_data[client_name] = client_settings[client_name]

2707

2708

# Create all client objects

2709

for client_name, client in clients_data.items():

2710

tcp_server.clients[client_name] = client_class(

2711

name = client_name,

2712

settings = client,

2713

server_settings = server_settings)

2714

2009

yield (name, special_settings[name]())

2010

except KeyError:

2011

yield (name, value)

2012

2013

tcp_server.clients.update(set(

2014

client_class(name = section,

2015

config= dict(client_config_items(

2016

client_config, section)))

2017

for section in client_config.sections()))

2715

2018

if not tcp_server.clients:

2716

2019

logger.warning("No clients defined")

2717

2718

if not foreground:

2719

if pidfile is not None:

2720

pid = os.getpid()

2721

try:

2722

with pidfile:

2723

print(pid, file=pidfile)

2724

except IOError:

2725

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

2726

pidfilename, pid)

2727

del pidfile

2020

2021

if not debug:

2022

try:

2023

with pidfile:

2024

pid = os.getpid()

2025

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

2026

del pidfile

2027

except IOError:

2028

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

2029

pidfilename, pid)

2030

except NameError:

2031

# "pidfile" was never created

2032

pass

2728

2033

del pidfilename

2034

2035

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

2729

2036

2730

2037

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

2731

2038

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

2732

2039

2733

2040

if use_dbus:

2734

2735

@alternate_dbus_interfaces(

2736

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

2737

class MandosDBusService(DBusObjectWithProperties):

2041

class MandosDBusService(dbus.service.Object):

2738

2042

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

2739

2740

2043

def __init__(self):

2741

2044

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

2742

2743

2045

_interface = "se.recompile.Mandos"

2744

2046

2745

@dbus_interface_annotations(_interface)

2746

def _foo(self):

2747

return {

2748

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

2749

"false" }

2750

2751

2047

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

2752

2048

def ClientAdded(self, objpath):

2753

2049

"D-Bus signal"

2766

2062

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

2767

2063

def GetAllClients(self):

2768

2064

"D-Bus method"

2769

return dbus.Array(c.dbus_object_path for c in

2770

tcp_server.clients.itervalues())

2065

return dbus.Array(c.dbus_object_path

2066

for c in tcp_server.clients)

2771

2067

2772

2068

@dbus.service.method(_interface,

2773

2069

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

2774

2070

def GetAllClientsWithProperties(self):

2775

2071

"D-Bus method"

2776

2072

return dbus.Dictionary(

2777

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

2778

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

2073

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

2074

for c in tcp_server.clients),

2779

2075

signature="oa{sv}")

2780

2076

2781

2077

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

2782

2078

def RemoveClient(self, object_path):

2783

2079

"D-Bus method"

2784

for c in tcp_server.clients.itervalues():

2080

for c in tcp_server.clients:

2785

2081

if c.dbus_object_path == object_path:

2786

del tcp_server.clients[c.name]

2082

tcp_server.clients.remove(c)

2787

2083

c.remove_from_connection()

2788

2084

# Don't signal anything except ClientRemoved

2789

2085

c.disable(quiet=True)

2794

2090

2795

2091

del _interface

2796

2092

2797

mandos_dbus_service = MandosDBusService()

2093

class MandosDBusServiceTransitional(MandosDBusService):

2094

__metaclass__ = AlternateDBusNamesMetaclass

2095

mandos_dbus_service = MandosDBusServiceTransitional()

2798

2096

2799

2097

def cleanup():

2800

2098

"Cleanup function; run on exit"

2801

if zeroconf:

2802

service.cleanup()

2803

2804

multiprocessing.active_children()

2805

wnull.close()

2806

if not (tcp_server.clients or client_settings):

2807

return

2808

2809

# Store client before exiting. Secrets are encrypted with key

2810

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

2811

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

2812

clients = {}

2813

with PGPEngine() as pgp:

2814

for client in tcp_server.clients.itervalues():

2815

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

2816

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

2817

key)

2818

client_dict = {}

2819

2820

# A list of attributes that can not be pickled

2821

# + secret.

2822

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

2823

"checker", "server_settings" }

2824

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

2825

.Object):

2826

exclude.add(name)

2827

2828

client_dict["encrypted_secret"] = (client

2829

.encrypted_secret)

2830

for attr in client.client_structure:

2831

if attr not in exclude:

2832

client_dict[attr] = getattr(client, attr)

2833

2834

clients[client.name] = client_dict

2835

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

2836

2837

try:

2838

with tempfile.NamedTemporaryFile(

2839

mode='wb',

2840

suffix=".pickle",

2841

prefix='clients-',

2842

dir=os.path.dirname(stored_state_path),

2843

delete=False) as stored_state:

2844

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

2845

tempname = stored_state.name

2846

os.rename(tempname, stored_state_path)

2847

except (IOError, OSError) as e:

2848

if not debug:

2849

try:

2850

os.remove(tempname)

2851

except NameError:

2852

pass

2853

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

2854

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

2855

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

2856

else:

2857

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

2858

exc_info=e)

2859

raise

2860

2861

# Delete all clients, and settings from config

2099

service.cleanup()

2100

2862

2101

while tcp_server.clients:

2863

name, client = tcp_server.clients.popitem()

2102

client = tcp_server.clients.pop()

2864

2103

if use_dbus:

2865

2104

client.remove_from_connection()

2105

client.disable_hook = None

2866

2106

# Don't signal anything except ClientRemoved

2867

2107

client.disable(quiet=True)

2868

2108

if use_dbus:

2869

2109

# Emit D-Bus signal

2870

mandos_dbus_service.ClientRemoved(

2871

client.dbus_object_path, client.name)

2872

client_settings.clear()

2110

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2111

client.name)

2873

2112

2874

2113

atexit.register(cleanup)

2875

2114

2876

for client in tcp_server.clients.itervalues():

2115

for client in tcp_server.clients:

2877

2116

if use_dbus:

2878

2117

# Emit D-Bus signal

2879

2118

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2880

# Need to initiate checking of clients

2881

if client.enabled:

2882

client.init_checker()

2119

client.enable()

2883

2120

2884

2121

tcp_server.enable()

2885

2122

tcp_server.server_activate()

2886

2123

2887

2124

# Find out what port we got

2888

if zeroconf:

2889

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

2125

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

2890

2126

if use_ipv6:

2891

2127

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

2892

" flowinfo %d, scope_id %d",

2893

*tcp_server.socket.getsockname())

2128

" flowinfo %d, scope_id %d"

2129

% tcp_server.socket.getsockname())

2894

2130

else: # IPv4

2895

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

2896

*tcp_server.socket.getsockname())

2131

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

2132

% tcp_server.socket.getsockname())

2897

2133

2898

2134

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

2899

2135

2900

2136

try:

2901

if zeroconf:

2902

# From the Avahi example code

2903

try:

2904

service.activate()

2905

except dbus.exceptions.DBusException as error:

2906

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

2907

cleanup()

2908

sys.exit(1)

2909

# End of Avahi example code

2137

# From the Avahi example code

2138

try:

2139

service.activate()

2140

except dbus.exceptions.DBusException as error:

2141

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

2142

cleanup()

2143

sys.exit(1)

2144

# End of Avahi example code

2910

2145

2911

2146

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

2912

2147

lambda *args, **kwargs:

2916

2151

logger.debug("Starting main loop")

2917

2152

main_loop.run()

2918

2153

except AvahiError as error:

2919

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

2154

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

2920

2155

cleanup()

2921

2156

sys.exit(1)

2922

2157

except KeyboardInterrupt: