/mandos/trunk : revision 482

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# "AvahiService" class, and some lines in "main".

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#

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# Everything else is

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#

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# This program is free software: you can redistribute it and/or modify

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# it under the terms of the GNU General Public License as published by

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# along with this program. If not, see

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# <http://www.gnu.org/licenses/>.

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#

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# Contact the authors at <mandos@recompile.se>.

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# Contact the authors at <mandos@fukt.bsnet.se>.

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#

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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from future_builtins import *

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try:

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import SocketServer as socketserver

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except ImportError:

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import socketserver

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import SocketServer as socketserver

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import socket

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import argparse

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import datetime

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import errno

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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 gnutls.crypto

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import gnutls.connection

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import gnutls.errors

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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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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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from gi.repository import GObject

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except ImportError:

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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 = "1.7.3"

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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.gpg = "gpg"

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try:

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output = subprocess.check_output(["gpgconf"])

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for line in output.splitlines():

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name, text, path = line.split(":")

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if name == "gpg":

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self.gpg = path

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break

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except OSError as e:

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if e.errno != errno.ENOENT:

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raise

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self.gnupgargs = ['--batch',

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'--homedir', 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([self.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([self.gpg, '--decrypt',

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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version = "1.3.0"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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class AvahiError(Exception):

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

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self.value = value

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

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**kwargs)

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

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def __unicode__(self):

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return unicode(repr(self.value))

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class AvahiServiceError(AvahiError):

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pass

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class AvahiGroupError(AvahiError):

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pass

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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def __init__(self,

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interface = avahi.IF_UNSPEC,

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name = None,

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servicetype = None,

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port = None,

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TXT = None,

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domain = "",

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host = "",

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max_renames = 32768,

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protocol = avahi.PROTO_UNSPEC,

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bus = None):

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

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

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

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protocol = avahi.PROTO_UNSPEC, bus = None):

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self.interface = interface

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self.name = name

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self.type = servicetype

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self.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"):

323

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)

174

self.cleanup()

175

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"""

179

if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException) as e:

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pass

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self.group = None

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match.remove()

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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if self.group is None:

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self.group = dbus.Interface(

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self.bus.get_object(avahi.DBUS_NAME,

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self.server.EntryGroupNew()),

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.group = dbus.Interface(

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self.bus.get_object(avahi.DBUS_NAME,

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self.server.EntryGroupNew(),

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follow_name_owner_changes=True),

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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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202

self.group.AddService(

357

208

dbus.UInt16(self.port),

358

209

avahi.string_array_to_txt_array(self.TXT))

359

210

self.group.Commit()

360

361

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def entry_group_state_changed(self, state, error):

362

212

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

363

213

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

369

219

self.rename()

370

220

elif state == avahi.ENTRY_GROUP_FAILURE:

371

221

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

372

str(error))

373

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

374

222

unicode(error))

223

raise AvahiGroupError("State changed: %s"

224

% unicode(error))

375

225

def cleanup(self):

376

226

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

377

if self.group is not None:

378

try:

379

self.group.Free()

380

except (dbus.exceptions.UnknownMethodException,

381

dbus.exceptions.DBusException):

382

pass

383

self.group = None

384

227

self.remove()

385

386

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

387

229

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

388

230

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

389

bad_states = {

390

avahi.SERVER_INVALID: "Zeroconf server invalid",

391

avahi.SERVER_REGISTERING: None,

392

avahi.SERVER_COLLISION: "Zeroconf server name collision",

393

avahi.SERVER_FAILURE: "Zeroconf server failure",

394

}

231

bad_states = { avahi.SERVER_INVALID:

232

"Zeroconf server invalid",

233

avahi.SERVER_REGISTERING: None,

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avahi.SERVER_COLLISION:

235

"Zeroconf server name collision",

236

avahi.SERVER_FAILURE:

237

"Zeroconf server failure" }

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238

if state in bad_states:

396

if bad_states[state] is not None:

397

if error is None:

398

logger.error(bad_states[state])

399

else:

400

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

401

self.cleanup()

239

if bad_states[state]:

240

logger.error(bad_states[state])

241

self.remove()

402

242

elif state == avahi.SERVER_RUNNING:

403

try:

404

self.add()

405

except dbus.exceptions.DBusException as error:

406

if (error.get_dbus_name()

407

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

408

logger.info("Local Zeroconf service name"

409

" collision.")

410

return self.rename(remove=False)

411

else:

412

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

413

self.cleanup()

414

os._exit(1)

243

self.add()

415

244

else:

416

if error is None:

417

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

418

else:

419

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

420

245

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

421

246

def activate(self):

422

247

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

423

248

if self.server is None:

427

252

follow_name_owner_changes=True),

428

253

avahi.DBUS_INTERFACE_SERVER)

429

254

self.server.connect_to_signal("StateChanged",

430

self.server_state_changed)

255

self.server_state_changed)

431

256

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

432

257

433

258

434

class AvahiServiceToSyslog(AvahiService):

435

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

436

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

437

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

438

syslogger.setFormatter(logging.Formatter(

439

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

440

.format(self.name)))

441

return ret

442

443

# Pretend that we have a GnuTLS module

444

class GnuTLS(object):

445

"""This isn't so much a class as it is a module-like namespace.

446

It is instantiated once, and simulates having a GnuTLS module."""

447

448

_library = ctypes.cdll.LoadLibrary(

449

ctypes.util.find_library("gnutls"))

450

_need_version = "3.3.0"

451

def __init__(self):

452

# Need to use class name "GnuTLS" here, since this method is

453

# called before the assignment to the "gnutls" global variable

454

# happens.

455

if GnuTLS.check_version(self._need_version) is None:

456

raise GnuTLS.Error("Needs GnuTLS {} or later"

457

.format(self._need_version))

458

459

# Unless otherwise indicated, the constants and types below are

460

# all from the gnutls/gnutls.h C header file.

461

462

# Constants

463

E_SUCCESS = 0

464

E_INTERRUPTED = -52

465

E_AGAIN = -28

466

CRT_OPENPGP = 2

467

CLIENT = 2

468

SHUT_RDWR = 0

469

CRD_CERTIFICATE = 1

470

E_NO_CERTIFICATE_FOUND = -49

471

OPENPGP_FMT_RAW = 0 # gnutls/openpgp.h

472

473

# Types

474

class session_int(ctypes.Structure):

475

_fields_ = []

476

session_t = ctypes.POINTER(session_int)

477

class certificate_credentials_st(ctypes.Structure):

478

_fields_ = []

479

certificate_credentials_t = ctypes.POINTER(

480

certificate_credentials_st)

481

certificate_type_t = ctypes.c_int

482

class datum_t(ctypes.Structure):

483

_fields_ = [('data', ctypes.POINTER(ctypes.c_ubyte)),

484

('size', ctypes.c_uint)]

485

class openpgp_crt_int(ctypes.Structure):

486

_fields_ = []

487

openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)

488

openpgp_crt_fmt_t = ctypes.c_int # gnutls/openpgp.h

489

log_func = ctypes.CFUNCTYPE(None, ctypes.c_int, ctypes.c_char_p)

490

credentials_type_t = ctypes.c_int #

491

transport_ptr_t = ctypes.c_void_p

492

close_request_t = ctypes.c_int

493

494

# Exceptions

495

class Error(Exception):

496

# We need to use the class name "GnuTLS" here, since this

497

# exception might be raised from within GnuTLS.__init__,

498

# which is called before the assignment to the "gnutls"

499

# global variable has happened.

500

def __init__(self, message = None, code = None, args=()):

501

# Default usage is by a message string, but if a return

502

# code is passed, convert it to a string with

503

# gnutls.strerror()

504

self.code = code

505

if message is None and code is not None:

506

message = GnuTLS.strerror(code)

507

return super(GnuTLS.Error, self).__init__(

508

message, *args)

509

510

class CertificateSecurityError(Error):

511

pass

512

513

# Classes

514

class Credentials(object):

515

def __init__(self):

516

self._c_object = gnutls.certificate_credentials_t()

517

gnutls.certificate_allocate_credentials(

518

ctypes.byref(self._c_object))

519

self.type = gnutls.CRD_CERTIFICATE

520

521

def __del__(self):

522

gnutls.certificate_free_credentials(self._c_object)

523

524

class ClientSession(object):

525

def __init__(self, socket, credentials = None):

526

self._c_object = gnutls.session_t()

527

gnutls.init(ctypes.byref(self._c_object), gnutls.CLIENT)

528

gnutls.set_default_priority(self._c_object)

529

gnutls.transport_set_ptr(self._c_object, socket.fileno())

530

gnutls.handshake_set_private_extensions(self._c_object,

531

True)

532

self.socket = socket

533

if credentials is None:

534

credentials = gnutls.Credentials()

535

gnutls.credentials_set(self._c_object, credentials.type,

536

ctypes.cast(credentials._c_object,

537

ctypes.c_void_p))

538

self.credentials = credentials

539

540

def __del__(self):

541

gnutls.deinit(self._c_object)

542

543

def handshake(self):

544

return gnutls.handshake(self._c_object)

545

546

def send(self, data):

547

data = bytes(data)

548

data_len = len(data)

549

while data_len > 0:

550

data_len -= gnutls.record_send(self._c_object,

551

data[-data_len:],

552

data_len)

553

554

def bye(self):

555

return gnutls.bye(self._c_object, gnutls.SHUT_RDWR)

556

557

# Error handling functions

558

def _error_code(result):

559

"""A function to raise exceptions on errors, suitable

560

for the 'restype' attribute on ctypes functions"""

561

if result >= 0:

562

return result

563

if result == gnutls.E_NO_CERTIFICATE_FOUND:

564

raise gnutls.CertificateSecurityError(code = result)

565

raise gnutls.Error(code = result)

566

567

def _retry_on_error(result, func, arguments):

568

"""A function to retry on some errors, suitable

569

for the 'errcheck' attribute on ctypes functions"""

570

while result < 0:

571

if result not in (gnutls.E_INTERRUPTED, gnutls.E_AGAIN):

572

return _error_code(result)

573

result = func(*arguments)

574

return result

575

576

# Unless otherwise indicated, the function declarations below are

577

# all from the gnutls/gnutls.h C header file.

578

579

# Functions

580

priority_set_direct = _library.gnutls_priority_set_direct

581

priority_set_direct.argtypes = [session_t, ctypes.c_char_p,

582

ctypes.POINTER(ctypes.c_char_p)]

583

priority_set_direct.restype = _error_code

584

585

init = _library.gnutls_init

586

init.argtypes = [ctypes.POINTER(session_t), ctypes.c_int]

587

init.restype = _error_code

588

589

set_default_priority = _library.gnutls_set_default_priority

590

set_default_priority.argtypes = [session_t]

591

set_default_priority.restype = _error_code

592

593

record_send = _library.gnutls_record_send

594

record_send.argtypes = [session_t, ctypes.c_void_p,

595

ctypes.c_size_t]

596

record_send.restype = ctypes.c_ssize_t

597

record_send.errcheck = _retry_on_error

598

599

certificate_allocate_credentials = (

600

_library.gnutls_certificate_allocate_credentials)

601

certificate_allocate_credentials.argtypes = [

602

ctypes.POINTER(certificate_credentials_t)]

603

certificate_allocate_credentials.restype = _error_code

604

605

certificate_free_credentials = (

606

_library.gnutls_certificate_free_credentials)

607

certificate_free_credentials.argtypes = [certificate_credentials_t]

608

certificate_free_credentials.restype = None

609

610

handshake_set_private_extensions = (

611

_library.gnutls_handshake_set_private_extensions)

612

handshake_set_private_extensions.argtypes = [session_t,

613

ctypes.c_int]

614

handshake_set_private_extensions.restype = None

615

616

credentials_set = _library.gnutls_credentials_set

617

credentials_set.argtypes = [session_t, credentials_type_t,

618

ctypes.c_void_p]

619

credentials_set.restype = _error_code

620

621

strerror = _library.gnutls_strerror

622

strerror.argtypes = [ctypes.c_int]

623

strerror.restype = ctypes.c_char_p

624

625

certificate_type_get = _library.gnutls_certificate_type_get

626

certificate_type_get.argtypes = [session_t]

627

certificate_type_get.restype = _error_code

628

629

certificate_get_peers = _library.gnutls_certificate_get_peers

630

certificate_get_peers.argtypes = [session_t,

631

ctypes.POINTER(ctypes.c_uint)]

632

certificate_get_peers.restype = ctypes.POINTER(datum_t)

633

634

global_set_log_level = _library.gnutls_global_set_log_level

635

global_set_log_level.argtypes = [ctypes.c_int]

636

global_set_log_level.restype = None

637

638

global_set_log_function = _library.gnutls_global_set_log_function

639

global_set_log_function.argtypes = [log_func]

640

global_set_log_function.restype = None

641

642

deinit = _library.gnutls_deinit

643

deinit.argtypes = [session_t]

644

deinit.restype = None

645

646

handshake = _library.gnutls_handshake

647

handshake.argtypes = [session_t]

648

handshake.restype = _error_code

649

handshake.errcheck = _retry_on_error

650

651

transport_set_ptr = _library.gnutls_transport_set_ptr

652

transport_set_ptr.argtypes = [session_t, transport_ptr_t]

653

transport_set_ptr.restype = None

654

655

bye = _library.gnutls_bye

656

bye.argtypes = [session_t, close_request_t]

657

bye.restype = _error_code

658

bye.errcheck = _retry_on_error

659

660

check_version = _library.gnutls_check_version

661

check_version.argtypes = [ctypes.c_char_p]

662

check_version.restype = ctypes.c_char_p

663

664

# All the function declarations below are from gnutls/openpgp.h

665

666

openpgp_crt_init = _library.gnutls_openpgp_crt_init

667

openpgp_crt_init.argtypes = [ctypes.POINTER(openpgp_crt_t)]

668

openpgp_crt_init.restype = _error_code

669

670

openpgp_crt_import = _library.gnutls_openpgp_crt_import

671

openpgp_crt_import.argtypes = [openpgp_crt_t,

672

ctypes.POINTER(datum_t),

673

openpgp_crt_fmt_t]

674

openpgp_crt_import.restype = _error_code

675

676

openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self

677

openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,

678

ctypes.POINTER(ctypes.c_uint)]

679

openpgp_crt_verify_self.restype = _error_code

680

681

openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit

682

openpgp_crt_deinit.argtypes = [openpgp_crt_t]

683

openpgp_crt_deinit.restype = None

684

685

openpgp_crt_get_fingerprint = (

686

_library.gnutls_openpgp_crt_get_fingerprint)

687

openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,

688

ctypes.c_void_p,

689

ctypes.POINTER(

690

ctypes.c_size_t)]

691

openpgp_crt_get_fingerprint.restype = _error_code

692

693

# Remove non-public functions

694

del _error_code, _retry_on_error

695

# Create the global "gnutls" object, simulating a module

696

gnutls = GnuTLS()

697

698

def call_pipe(connection, # : multiprocessing.Connection

699

func, *args, **kwargs):

700

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

701

702

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

703

return value on the provided multiprocessing.Connection.

704

"""

705

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

706

connection.close()

707

708

259

class Client(object):

709

260

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

710

261

711

262

Attributes:

712

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

263

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

713

264

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

714

265

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

715

266

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

716

267

to see if the client lives.

717

268

'None' if no process is running.

718

checker_callback_tag: a GObject event source tag, or None

269

checker_callback_tag: a gobject event source tag, or None

719

270

checker_command: string; External command which is run to check

720

271

if client lives. %() expansions are done at

721

272

runtime with vars(self) as dict, so that for

722

273

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

723

checker_initiator_tag: a GObject event source tag, or None

274

checker_initiator_tag: a gobject event source tag, or None

724

275

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

725

client_structure: Object describing what attributes a client has

726

and is used for storing the client at exit

727

276

current_checker_command: string; current running checker_command

728

disable_initiator_tag: a GObject event source tag, or None

277

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

278

disable_initiator_tag: a gobject event source tag, or None

729

279

enabled: bool()

730

280

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

731

281

uniquely identify the client

733

283

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

734

284

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

735

285

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

736

last_checker_status: integer between 0 and 255 reflecting exit

737

status of last checker. -1 reflects crashed

738

checker, -2 means no checker completed yet.

739

last_checker_signal: The signal which killed the last checker, if

740

last_checker_status is -1

741

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

286

last_enabled: datetime.datetime(); (UTC)

742

287

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

743

288

D-Bus identifiers

744

289

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

745

290

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

746

291

until this client is disabled

747

extended_timeout: extra long timeout when secret has been sent

748

292

runtime_expansions: Allowed attributes for runtime expansion.

749

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

750

disabled, or None

751

server_settings: The server_settings dict from main()

752

293

"""

753

294

754

295

runtime_expansions = ("approval_delay", "approval_duration",

755

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

756

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

757

"last_approval_request", "last_checked_ok",

296

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

297

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

758

298

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

759

client_defaults = {

760

"timeout": "PT5M",

761

"extended_timeout": "PT15M",

762

"interval": "PT2M",

763

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

764

"host": "",

765

"approval_delay": "PT0S",

766

"approval_duration": "PT1S",

767

"approved_by_default": "True",

768

"enabled": "True",

769

}

770

299

771

300

@staticmethod

772

def config_parser(config):

773

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

774

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

775

with exceptions for any special settings as defined above.

776

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

777

value given the same arguments.

778

"""

779

settings = {}

780

for client_name in config.sections():

781

section = dict(config.items(client_name))

782

client = settings[client_name] = {}

783

784

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

785

# Reformat values from string types to Python types

786

client["approved_by_default"] = config.getboolean(

787

client_name, "approved_by_default")

788

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

789

"enabled")

790

791

# Uppercase and remove spaces from fingerprint for later

792

# comparison purposes with return value from the

793

# fingerprint() function

794

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

795

.replace(" ", ""))

796

if "secret" in section:

797

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

798

elif "secfile" in section:

799

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

800

(section["secfile"])),

801

"rb") as secfile:

802

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

803

else:

804

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

805

.format(section))

806

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

807

client["extended_timeout"] = string_to_delta(

808

section["extended_timeout"])

809

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

810

client["approval_delay"] = string_to_delta(

811

section["approval_delay"])

812

client["approval_duration"] = string_to_delta(

813

section["approval_duration"])

814

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

815

client["last_approval_request"] = None

816

client["last_checked_ok"] = None

817

client["last_checker_status"] = -2

818

819

return settings

820

821

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

301

def _timedelta_to_milliseconds(td):

302

"Convert a datetime.timedelta() to milliseconds"

303

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

304

+ (td.seconds * 1000)

305

+ (td.microseconds // 1000))

306

307

def timeout_milliseconds(self):

308

"Return the 'timeout' attribute in milliseconds"

309

return self._timedelta_to_milliseconds(self.timeout)

310

311

def interval_milliseconds(self):

312

"Return the 'interval' attribute in milliseconds"

313

return self._timedelta_to_milliseconds(self.interval)

314

315

def approval_delay_milliseconds(self):

316

return self._timedelta_to_milliseconds(self.approval_delay)

317

318

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

319

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

320

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

321

attribute."""

822

322

self.name = name

823

if server_settings is None:

824

server_settings = {}

825

self.server_settings = server_settings

826

# adding all client settings

827

for setting, value in settings.items():

828

setattr(self, setting, value)

829

830

if self.enabled:

831

if not hasattr(self, "last_enabled"):

832

self.last_enabled = datetime.datetime.utcnow()

833

if not hasattr(self, "expires"):

834

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

835

+ self.timeout)

836

else:

837

self.last_enabled = None

838

self.expires = None

839

323

if config is None:

324

config = {}

840

325

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

326

# Uppercase and remove spaces from fingerprint for later

327

# comparison purposes with return value from the fingerprint()

328

# function

329

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

330

.replace(" ", ""))

841

331

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

842

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

843

datetime.datetime.utcnow())

844

845

# attributes specific for this server instance

332

if "secret" in config:

333

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

334

elif "secfile" in config:

335

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

336

(config["secfile"])),

337

"rb") as secfile:

338

self.secret = secfile.read()

339

else:

340

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

341

% self.name)

342

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

343

self.created = datetime.datetime.utcnow()

344

self.enabled = False

345

self.last_approval_request = None

346

self.last_enabled = None

347

self.last_checked_ok = None

348

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

349

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

350

self.disable_hook = disable_hook

846

351

self.checker = None

847

352

self.checker_initiator_tag = None

848

353

self.disable_initiator_tag = None

849

354

self.checker_callback_tag = None

355

self.checker_command = config["checker"]

850

356

self.current_checker_command = None

851

self.approved = None

357

self.last_connect = None

358

self._approved = None

359

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

360

True)

852

361

self.approvals_pending = 0

853

self.changedstate = multiprocessing_manager.Condition(

854

multiprocessing_manager.Lock())

855

self.client_structure = [attr

856

for attr in self.__dict__.iterkeys()

857

if not attr.startswith("_")]

858

self.client_structure.append("client_structure")

859

860

for name, t in inspect.getmembers(

861

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

862

if not name.startswith("_"):

863

self.client_structure.append(name)

362

self.approval_delay = string_to_delta(

363

config["approval_delay"])

364

self.approval_duration = string_to_delta(

365

config["approval_duration"])

366

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

864

367

865

# Send notice to process children that client state has changed

866

368

def send_changedstate(self):

867

with self.changedstate:

868

self.changedstate.notify_all()

869

369

self.changedstate.acquire()

370

self.changedstate.notify_all()

371

self.changedstate.release()

372

870

373

def enable(self):

871

374

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

872

375

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

873

376

# Already enabled

874

377

return

875

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

876

self.enabled = True

378

self.send_changedstate()

877

379

self.last_enabled = datetime.datetime.utcnow()

878

self.init_checker()

879

self.send_changedstate()

380

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

381

# and every interval from then on.

382

self.checker_initiator_tag = (gobject.timeout_add

383

(self.interval_milliseconds(),

384

self.start_checker))

385

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

386

self.disable_initiator_tag = (gobject.timeout_add

387

(self.timeout_milliseconds(),

388

self.disable))

389

self.enabled = True

390

# Also start a new checker *right now*.

391

self.start_checker()

880

392

881

393

def disable(self, quiet=True):

882

394

"""Disable this client."""

883

395

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

884

396

return False

885

397

if not quiet:

398

self.send_changedstate()

399

if not quiet:

886

400

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

887

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

888

GObject.source_remove(self.disable_initiator_tag)

401

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

402

gobject.source_remove(self.disable_initiator_tag)

889

403

self.disable_initiator_tag = None

890

self.expires = None

891

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

892

GObject.source_remove(self.checker_initiator_tag)

404

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

405

gobject.source_remove(self.checker_initiator_tag)

893

406

self.checker_initiator_tag = None

894

407

self.stop_checker()

408

if self.disable_hook:

409

self.disable_hook(self)

895

410

self.enabled = False

896

if not quiet:

897

self.send_changedstate()

898

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

411

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

899

412

return False

900

413

901

414

def __del__(self):

415

self.disable_hook = None

902

416

self.disable()

903

417

904

def init_checker(self):

905

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

906

# and every interval from then on.

907

if self.checker_initiator_tag is not None:

908

GObject.source_remove(self.checker_initiator_tag)

909

self.checker_initiator_tag = GObject.timeout_add(

910

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

911

self.start_checker)

912

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

913

if self.disable_initiator_tag is not None:

914

GObject.source_remove(self.disable_initiator_tag)

915

self.disable_initiator_tag = GObject.timeout_add(

916

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

917

# Also start a new checker *right now*.

918

self.start_checker()

919

920

def checker_callback(self, source, condition, connection,

921

command):

418

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

922

419

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

923

420

self.checker_callback_tag = None

924

421

self.checker = None

925

# Read return code from connection (see call_pipe)

926

returncode = connection.recv()

927

connection.close()

928

929

if returncode >= 0:

930

self.last_checker_status = returncode

931

self.last_checker_signal = None

932

if self.last_checker_status == 0:

422

if os.WIFEXITED(condition):

423

exitstatus = os.WEXITSTATUS(condition)

424

if exitstatus == 0:

933

425

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

934

426

vars(self))

935

427

self.checked_ok()

936

428

else:

937

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

429

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

430

vars(self))

938

431

else:

939

self.last_checker_status = -1

940

self.last_checker_signal = -returncode

941

432

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

942

433

vars(self))

943

return False

944

434

945

435

def checked_ok(self):

946

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

436

"""Bump up the timeout for this client.

437

438

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

439

alive and well.

440

"""

947

441

self.last_checked_ok = datetime.datetime.utcnow()

948

self.last_checker_status = 0

949

self.last_checker_signal = None

950

self.bump_timeout()

951

952

def bump_timeout(self, timeout=None):

953

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

954

if timeout is None:

955

timeout = self.timeout

956

if self.disable_initiator_tag is not None:

957

GObject.source_remove(self.disable_initiator_tag)

958

self.disable_initiator_tag = None

959

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

960

self.disable_initiator_tag = GObject.timeout_add(

961

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

962

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

442

gobject.source_remove(self.disable_initiator_tag)

443

self.disable_initiator_tag = (gobject.timeout_add

444

(self.timeout_milliseconds(),

445

self.disable))

963

446

964

447

def need_approval(self):

965

448

self.last_approval_request = datetime.datetime.utcnow()

970

453

If a checker already exists, leave it running and do

971

454

nothing."""

972

455

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

973

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

974

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

975

# would inevitably timeout, since no checker would get a

976

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

456

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

457

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

458

# client would inevitably timeout, since no checker would get

459

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

977

460

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

978

461

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

979

462

# should be.

980

463

981

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

982

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

983

self.checker.join()

984

self.checker = None

464

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

465

try:

466

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

467

except (AttributeError, OSError) as error:

468

if (isinstance(error, OSError)

469

and error.errno != errno.ECHILD):

470

raise error

471

else:

472

if pid:

473

logger.warning("Checker was a zombie")

474

gobject.source_remove(self.checker_callback_tag)

475

self.checker_callback(pid, status,

476

self.current_checker_command)

985

477

# Start a new checker if needed

986

478

if self.checker is None:

987

# Escape attributes for the shell

988

escaped_attrs = {

989

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

990

for attr in self.runtime_expansions }

991

479

try:

992

command = self.checker_command % escaped_attrs

993

except TypeError as error:

994

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

995

self.checker_command,

996

exc_info=error)

997

return True # Try again later

480

# In case checker_command has exactly one % operator

481

command = self.checker_command % self.host

482

except TypeError:

483

# Escape attributes for the shell

484

escaped_attrs = dict(

485

(attr,

486

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

487

errors=

488

'replace')))

489

for attr in

490

self.runtime_expansions)

491

492

try:

493

command = self.checker_command % escaped_attrs

494

except TypeError as error:

495

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

496

' %s', self.checker_command, error)

497

return True # Try again later

998

498

self.current_checker_command = command

999

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

1000

self.name)

1001

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

1002

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

1003

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

1004

# always replaced by /dev/null.)

1005

# The exception is when not debugging but nevertheless

1006

# running in the foreground; use the previously

1007

# created wnull.

1008

popen_args = { "close_fds": True,

1009

"shell": True,

1010

"cwd": "/" }

1011

if (not self.server_settings["debug"]

1012

and self.server_settings["foreground"]):

1013

popen_args.update({"stdout": wnull,

1014

"stderr": wnull })

1015

pipe = multiprocessing.Pipe(duplex = False)

1016

self.checker = multiprocessing.Process(

1017

target = call_pipe,

1018

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

1019

kwargs = popen_args)

1020

self.checker.start()

1021

self.checker_callback_tag = GObject.io_add_watch(

1022

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

1023

self.checker_callback, pipe[0], command)

1024

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

499

try:

500

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

501

command, self.name)

502

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

503

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

504

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

505

# always replaced by /dev/null.)

506

self.checker = subprocess.Popen(command,

507

close_fds=True,

508

shell=True, cwd="/")

509

self.checker_callback_tag = (gobject.child_watch_add

510

(self.checker.pid,

511

self.checker_callback,

512

data=command))

513

# The checker may have completed before the gobject

514

# watch was added. Check for this.

515

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

516

if pid:

517

gobject.source_remove(self.checker_callback_tag)

518

self.checker_callback(pid, status, command)

519

except OSError as error:

520

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

521

error)

522

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

1025

523

return True

1026

524

1027

525

def stop_checker(self):

1028

526

"""Force the checker process, if any, to stop."""

1029

527

if self.checker_callback_tag:

1030

GObject.source_remove(self.checker_callback_tag)

528

gobject.source_remove(self.checker_callback_tag)

1031

529

self.checker_callback_tag = None

1032

530

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

1033

531

return

1034

532

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

1035

self.checker.terminate()

533

try:

534

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

535

#time.sleep(0.5)

536

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

537

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

538

except OSError as error:

539

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

540

raise

1036

541

self.checker = None

1037

542

1038

1039

def dbus_service_property(dbus_interface,

1040

signature="v",

1041

access="readwrite",

1042

byte_arrays=False):

543

def dbus_service_property(dbus_interface, signature="v",

544

access="readwrite", byte_arrays=False):

1043

545

"""Decorators for marking methods of a DBusObjectWithProperties to

1044

546

become properties on the D-Bus.

1045

547

1054

556

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

1055

557

if byte_arrays and signature != "ay":

1056

558

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

1057

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

1058

559

" signature %r" % signature)

1059

560

def decorator(func):

1060

561

func._dbus_is_property = True

1061

562

func._dbus_interface = dbus_interface

1066

567

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

1067

568

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

1068

569

return func

1069

1070

return decorator

1071

1072

1073

def dbus_interface_annotations(dbus_interface):

1074

"""Decorator for marking functions returning interface annotations

1075

1076

Usage:

1077

1078

@dbus_interface_annotations("org.example.Interface")

1079

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

1080

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

1081

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

1082

"false"}

1083

"""

1084

1085

def decorator(func):

1086

func._dbus_is_interface = True

1087

func._dbus_interface = dbus_interface

1088

func._dbus_name = dbus_interface

1089

return func

1090

1091

return decorator

1092

1093

1094

def dbus_annotations(annotations):

1095

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

1096

Usage:

1097

1098

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

1099

"org.freedesktop.DBus.Property."

1100

"EmitsChangedSignal": "false"})

1101

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

1102

access="r")

1103

def Property_dbus_property(self):

1104

return dbus.Boolean(False)

1105

1106

See also the DBusObjectWithAnnotations class.

1107

"""

1108

1109

def decorator(func):

1110

func._dbus_annotations = annotations

1111

return func

1112

1113

570

return decorator

1114

571

1115

572

1116

573

class DBusPropertyException(dbus.exceptions.DBusException):

1117

574

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

1118

575

"""

1119

pass

576

def __unicode__(self):

577

return unicode(str(self))

1120

578

1121

579

1122

580

class DBusPropertyAccessException(DBusPropertyException):

1131

589

pass

1132

590

1133

591

1134

class DBusObjectWithAnnotations(dbus.service.Object):

1135

"""A D-Bus object with annotations.

1136

1137

Classes inheriting from this can use the dbus_annotations

1138

decorator to add annotations to methods or signals.

1139

"""

1140

1141

@staticmethod

1142

def _is_dbus_thing(thing):

1143

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

1144

1145

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

1146

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

1147

"""

1148

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

1149

False)

1150

1151

def _get_all_dbus_things(self, thing):

1152

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

1153

"""

1154

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

1155

athing.__get__(self))

1156

for cls in self.__class__.__mro__

1157

for name, athing in

1158

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

1159

1160

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1161

out_signature = "s",

1162

path_keyword = 'object_path',

1163

connection_keyword = 'connection')

1164

def Introspect(self, object_path, connection):

1165

"""Overloading of standard D-Bus method.

1166

1167

Inserts annotation tags on methods and signals.

1168

"""

1169

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

1170

connection)

1171

try:

1172

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

1173

1174

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

1175

# Add annotation tags

1176

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

1177

for tag in if_tag.getElementsByTagName(typ):

1178

annots = dict()

1179

for name, prop in (self.

1180

_get_all_dbus_things(typ)):

1181

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

1182

and prop._dbus_interface

1183

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

1184

annots.update(getattr(

1185

prop, "_dbus_annotations", {}))

1186

for name, value in annots.items():

1187

ann_tag = document.createElement(

1188

"annotation")

1189

ann_tag.setAttribute("name", name)

1190

ann_tag.setAttribute("value", value)

1191

tag.appendChild(ann_tag)

1192

# Add interface annotation tags

1193

for annotation, value in dict(

1194

itertools.chain.from_iterable(

1195

annotations().items()

1196

for name, annotations

1197

in self._get_all_dbus_things("interface")

1198

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

1199

)).items():

1200

ann_tag = document.createElement("annotation")

1201

ann_tag.setAttribute("name", annotation)

1202

ann_tag.setAttribute("value", value)

1203

if_tag.appendChild(ann_tag)

1204

# Fix argument name for the Introspect method itself

1205

if (if_tag.getAttribute("name")

1206

== dbus.INTROSPECTABLE_IFACE):

1207

for cn in if_tag.getElementsByTagName("method"):

1208

if cn.getAttribute("name") == "Introspect":

1209

for arg in cn.getElementsByTagName("arg"):

1210

if (arg.getAttribute("direction")

1211

== "out"):

1212

arg.setAttribute("name",

1213

"xml_data")

1214

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

1215

document.unlink()

1216

except (AttributeError, xml.dom.DOMException,

1217

xml.parsers.expat.ExpatError) as error:

1218

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

1219

exc_info=error)

1220

return xmlstring

1221

1222

1223

class DBusObjectWithProperties(DBusObjectWithAnnotations):

592

class DBusObjectWithProperties(dbus.service.Object):

1224

593

"""A D-Bus object with properties.

1225

594

1226

595

Classes inheriting from this can use the dbus_service_property

1227

596

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

1228

597

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

1229

598

"""

1230

599

600

@staticmethod

601

def _is_dbus_property(obj):

602

return getattr(obj, "_dbus_is_property", False)

603

604

def _get_all_dbus_properties(self):

605

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

606

"""

607

return ((prop._dbus_name, prop)

608

for name, prop in

609

inspect.getmembers(self, self._is_dbus_property))

610

1231

611

def _get_dbus_property(self, interface_name, property_name):

1232

612

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

1233

613

property with the specified name and interface.

1234

614

"""

1235

for cls in self.__class__.__mro__:

1236

for name, value in inspect.getmembers(

1237

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

1238

if (value._dbus_name == property_name

1239

and value._dbus_interface == interface_name):

1240

return value.__get__(self)

1241

615

for name in (property_name,

616

property_name + "_dbus_property"):

617

prop = getattr(self, name, None)

618

if (prop is None

619

or not self._is_dbus_property(prop)

620

or prop._dbus_name != property_name

621

or (interface_name and prop._dbus_interface

622

and interface_name != prop._dbus_interface)):

623

continue

624

return prop

1242

625

# No such property

1243

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

1244

self.dbus_object_path, interface_name, property_name))

1245

1246

@classmethod

1247

def _get_all_interface_names(cls):

1248

"""Get a sequence of all interfaces supported by an object"""

1249

return (name for name in set(getattr(getattr(x, attr),

1250

"_dbus_interface", None)

1251

for x in (inspect.getmro(cls))

1252

for attr in dir(x))

1253

if name is not None)

1254

1255

@dbus.service.method(dbus.PROPERTIES_IFACE,

1256

in_signature="ss",

626

raise DBusPropertyNotFound(self.dbus_object_path + ":"

627

+ interface_name + "."

628

+ property_name)

629

630

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

1257

631

out_signature="v")

1258

632

def Get(self, interface_name, property_name):

1259

633

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

1277

651

# The byte_arrays option is not supported yet on

1278

652

# signatures other than "ay".

1279

653

if prop._dbus_signature != "ay":

1280

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

1281

"'ay' signature {!r}"

1282

.format(prop._dbus_signature))

1283

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

1284

for byte in value))

654

raise ValueError

655

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

656

for byte in value))

1285

657

prop(value)

1286

658

1287

@dbus.service.method(dbus.PROPERTIES_IFACE,

1288

in_signature="s",

659

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

1289

660

out_signature="a{sv}")

1290

661

def GetAll(self, interface_name):

1291

662

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

1292

663

standard.

1293

664

1294

665

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

1295

666

"""

1296

properties = {}

1297

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

667

all = {}

668

for name, prop in self._get_all_dbus_properties():

1298

669

if (interface_name

1299

670

and interface_name != prop._dbus_interface):

1300

671

# Interface non-empty but did not match

1304

675

continue

1305

676

value = prop()

1306

677

if not hasattr(value, "variant_level"):

1307

properties[name] = value

678

all[name] = value

1308

679

continue

1309

properties[name] = type(value)(

1310

value, variant_level = value.variant_level + 1)

1311

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

1312

1313

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

1314

def PropertiesChanged(self, interface_name, changed_properties,

1315

invalidated_properties):

1316

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

1317

standard.

1318

"""

1319

pass

680

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

681

value.variant_level+1)

682

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

1320

683

1321

684

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1322

685

out_signature="s",

1323

686

path_keyword='object_path',

1324

687

connection_keyword='connection')

1325

688

def Introspect(self, object_path, connection):

1326

"""Overloading of standard D-Bus method.

1327

1328

Inserts property tags and interface annotation tags.

689

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

1329

690

"""

1330

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1331

object_path,

1332

connection)

691

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

692

connection)

1333

693

try:

1334

694

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

1335

1336

695

def make_tag(document, name, prop):

1337

696

e = document.createElement("property")

1338

697

e.setAttribute("name", name)

1339

698

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

1340

699

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

1341

700

return e

1342

1343

701

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

1344

# Add property tags

1345

702

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

1346

703

for name, prop

1347

in self._get_all_dbus_things("property")

704

in self._get_all_dbus_properties()

1348

705

if prop._dbus_interface

1349

706

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

1350

707

if_tag.appendChild(tag)

1351

# Add annotation tags for properties

1352

for tag in if_tag.getElementsByTagName("property"):

1353

annots = dict()

1354

for name, prop in self._get_all_dbus_things(

1355

"property"):

1356

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

1357

and prop._dbus_interface

1358

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

1359

annots.update(getattr(

1360

prop, "_dbus_annotations", {}))

1361

for name, value in annots.items():

1362

ann_tag = document.createElement(

1363

"annotation")

1364

ann_tag.setAttribute("name", name)

1365

ann_tag.setAttribute("value", value)

1366

tag.appendChild(ann_tag)

1367

708

# Add the names to the return values for the

1368

709

# "org.freedesktop.DBus.Properties" methods

1369

710

if (if_tag.getAttribute("name")

1384

725

except (AttributeError, xml.dom.DOMException,

1385

726

xml.parsers.expat.ExpatError) as error:

1386

727

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

1387

exc_info=error)

1388

return xmlstring

1389

1390

try:

1391

dbus.OBJECT_MANAGER_IFACE

1392

except AttributeError:

1393

dbus.OBJECT_MANAGER_IFACE = "org.freedesktop.DBus.ObjectManager"

1394

1395

class DBusObjectWithObjectManager(DBusObjectWithAnnotations):

1396

"""A D-Bus object with an ObjectManager.

1397

1398

Classes inheriting from this exposes the standard

1399

GetManagedObjects call and the InterfacesAdded and

1400

InterfacesRemoved signals on the standard

1401

"org.freedesktop.DBus.ObjectManager" interface.

1402

1403

Note: No signals are sent automatically; they must be sent

1404

manually.

1405

"""

1406

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

1407

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

1408

def GetManagedObjects(self):

1409

"""This function must be overridden"""

1410

raise NotImplementedError()

1411

1412

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,

1413

signature = "oa{sa{sv}}")

1414

def InterfacesAdded(self, object_path, interfaces_and_properties):

1415

pass

1416

1417

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE, signature = "oas")

1418

def InterfacesRemoved(self, object_path, interfaces):

1419

pass

1420

1421

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1422

out_signature = "s",

1423

path_keyword = 'object_path',

1424

connection_keyword = 'connection')

1425

def Introspect(self, object_path, connection):

1426

"""Overloading of standard D-Bus method.

1427

1428

Override return argument name of GetManagedObjects to be

1429

"objpath_interfaces_and_properties"

1430

"""

1431

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1432

object_path,

1433

connection)

1434

try:

1435

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

1436

1437

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

1438

# Fix argument name for the GetManagedObjects method

1439

if (if_tag.getAttribute("name")

1440

== dbus.OBJECT_MANAGER_IFACE):

1441

for cn in if_tag.getElementsByTagName("method"):

1442

if (cn.getAttribute("name")

1443

== "GetManagedObjects"):

1444

for arg in cn.getElementsByTagName("arg"):

1445

if (arg.getAttribute("direction")

1446

== "out"):

1447

arg.setAttribute(

1448

"name",

1449

"objpath_interfaces"

1450

"_and_properties")

1451

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

1452

document.unlink()

1453

except (AttributeError, xml.dom.DOMException,

1454

xml.parsers.expat.ExpatError) as error:

1455

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

1456

exc_info = error)

1457

return xmlstring

1458

1459

def datetime_to_dbus(dt, variant_level=0):

1460

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

1461

if dt is None:

1462

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

1463

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

1464

1465

1466

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1467

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

1468

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

1469

interface names according to the "alt_interface_names" mapping.

1470

Usage:

1471

1472

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

1473

"net.example.AlternateInterface"})

1474

class SampleDBusObject(dbus.service.Object):

1475

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

1476

def SampleDBusMethod():

1477

pass

1478

1479

The above "SampleDBusMethod" on "SampleDBusObject" will be

1480

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

1481

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

1482

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

1483

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

1484

1485

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

1486

(from DBusObjectWithProperties) and interfaces (from the

1487

dbus_interface_annotations decorator).

1488

"""

1489

1490

def wrapper(cls):

1491

for orig_interface_name, alt_interface_name in (

1492

alt_interface_names.items()):

1493

attr = {}

1494

interface_names = set()

1495

# Go though all attributes of the class

1496

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

1497

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

1498

# with the wrong interface name

1499

if (not hasattr(attribute, "_dbus_interface")

1500

or not attribute._dbus_interface.startswith(

1501

orig_interface_name)):

1502

continue

1503

# Create an alternate D-Bus interface name based on

1504

# the current name

1505

alt_interface = attribute._dbus_interface.replace(

1506

orig_interface_name, alt_interface_name)

1507

interface_names.add(alt_interface)

1508

# Is this a D-Bus signal?

1509

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

1510

if sys.version_info.major == 2:

1511

# Extract the original non-method undecorated

1512

# function by black magic

1513

nonmethod_func = (dict(

1514

zip(attribute.func_code.co_freevars,

1515

attribute.__closure__))

1516

["func"].cell_contents)

1517

else:

1518

nonmethod_func = attribute

1519

# Create a new, but exactly alike, function

1520

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

1521

# with the alternate D-Bus interface name

1522

if sys.version_info.major == 2:

1523

new_function = types.FunctionType(

1524

nonmethod_func.func_code,

1525

nonmethod_func.func_globals,

1526

nonmethod_func.func_name,

1527

nonmethod_func.func_defaults,

1528

nonmethod_func.func_closure)

1529

else:

1530

new_function = types.FunctionType(

1531

nonmethod_func.__code__,

1532

nonmethod_func.__globals__,

1533

nonmethod_func.__name__,

1534

nonmethod_func.__defaults__,

1535

nonmethod_func.__closure__)

1536

new_function = (dbus.service.signal(

1537

alt_interface,

1538

attribute._dbus_signature)(new_function))

1539

# Copy annotations, if any

1540

try:

1541

new_function._dbus_annotations = dict(

1542

attribute._dbus_annotations)

1543

except AttributeError:

1544

pass

1545

# Define a creator of a function to call both the

1546

# original and alternate functions, so both the

1547

# original and alternate signals gets sent when

1548

# the function is called

1549

def fixscope(func1, func2):

1550

"""This function is a scope container to pass

1551

func1 and func2 to the "call_both" function

1552

outside of its arguments"""

1553

1554

@functools.wraps(func2)

1555

def call_both(*args, **kwargs):

1556

"""This function will emit two D-Bus

1557

signals by calling func1 and func2"""

1558

func1(*args, **kwargs)

1559

func2(*args, **kwargs)

1560

# Make wrapper function look like a D-Bus signal

1561

for name, attr in inspect.getmembers(func2):

1562

if name.startswith("_dbus_"):

1563

setattr(call_both, name, attr)

1564

1565

return call_both

1566

# Create the "call_both" function and add it to

1567

# the class

1568

attr[attrname] = fixscope(attribute, new_function)

1569

# Is this a D-Bus method?

1570

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

1571

# Create a new, but exactly alike, function

1572

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

1573

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

1574

# to the class.

1575

attr[attrname] = (

1576

dbus.service.method(

1577

alt_interface,

1578

attribute._dbus_in_signature,

1579

attribute._dbus_out_signature)

1580

(types.FunctionType(attribute.func_code,

1581

attribute.func_globals,

1582

attribute.func_name,

1583

attribute.func_defaults,

1584

attribute.func_closure)))

1585

# Copy annotations, if any

1586

try:

1587

attr[attrname]._dbus_annotations = dict(

1588

attribute._dbus_annotations)

1589

except AttributeError:

1590

pass

1591

# Is this a D-Bus property?

1592

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

1593

# Create a new, but exactly alike, function

1594

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

1595

# property with the alternate D-Bus interface

1596

# name. Add it to the class.

1597

attr[attrname] = (dbus_service_property(

1598

alt_interface, attribute._dbus_signature,

1599

attribute._dbus_access,

1600

attribute._dbus_get_args_options

1601

["byte_arrays"])

1602

(types.FunctionType(

1603

attribute.func_code,

1604

attribute.func_globals,

1605

attribute.func_name,

1606

attribute.func_defaults,

1607

attribute.func_closure)))

1608

# Copy annotations, if any

1609

try:

1610

attr[attrname]._dbus_annotations = dict(

1611

attribute._dbus_annotations)

1612

except AttributeError:

1613

pass

1614

# Is this a D-Bus interface?

1615

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

1616

# Create a new, but exactly alike, function

1617

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

1618

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

1619

# to the class.

1620

attr[attrname] = (

1621

dbus_interface_annotations(alt_interface)

1622

(types.FunctionType(attribute.func_code,

1623

attribute.func_globals,

1624

attribute.func_name,

1625

attribute.func_defaults,

1626

attribute.func_closure)))

1627

if deprecate:

1628

# Deprecate all alternate interfaces

1629

iname="_AlternateDBusNames_interface_annotation{}"

1630

for interface_name in interface_names:

1631

1632

@dbus_interface_annotations(interface_name)

1633

def func(self):

1634

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

1635

"true" }

1636

# Find an unused name

1637

for aname in (iname.format(i)

1638

for i in itertools.count()):

1639

if aname not in attr:

1640

attr[aname] = func

1641

break

1642

if interface_names:

1643

# Replace the class with a new subclass of it with

1644

# methods, signals, etc. as created above.

1645

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

1646

(cls, ), attr)

1647

return cls

1648

1649

return wrapper

1650

1651

1652

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

1653

"se.bsnet.fukt.Mandos"})

728

error)

729

return xmlstring

730

731

1654

732

class ClientDBus(Client, DBusObjectWithProperties):

1655

733

"""A Client class using D-Bus

1656

734

1660

738

"""

1661

739

1662

740

runtime_expansions = (Client.runtime_expansions

1663

+ ("dbus_object_path", ))

1664

1665

_interface = "se.recompile.Mandos.Client"

741

+ ("dbus_object_path",))

1666

742

1667

743

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

1668

744

1669

745

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

746

self._approvals_pending = 0

1670

747

self.bus = bus

1671

748

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

1672

749

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

1673

750

# the D-Bus

1674

client_object_name = str(self.name).translate(

751

client_object_name = unicode(self.name).translate(

1675

752

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

1676

753

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

1677

self.dbus_object_path = dbus.ObjectPath(

1678

"/clients/" + client_object_name)

754

self.dbus_object_path = (dbus.ObjectPath

755

("/clients/" + client_object_name))

1679

756

DBusObjectWithProperties.__init__(self, self.bus,

1680

757

self.dbus_object_path)

1681

1682

def notifychangeproperty(transform_func, dbus_name,

1683

type_func=lambda x: x,

1684

variant_level=1,

1685

invalidate_only=False,

1686

_interface=_interface):

1687

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

1688

its changes to DBus.

1689

1690

transform_fun: Function that takes a value and a variant_level

1691

and transforms it to a D-Bus type.

1692

dbus_name: D-Bus name of the variable

1693

type_func: Function that transform the value before sending it

1694

to the D-Bus. Default: no transform

1695

variant_level: D-Bus variant level. Default: 1

1696

"""

1697

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

1698

1699

def setter(self, value):

1700

if hasattr(self, "dbus_object_path"):

1701

if (not hasattr(self, attrname) or

1702

type_func(getattr(self, attrname, None))

1703

!= type_func(value)):

1704

if invalidate_only:

1705

self.PropertiesChanged(

1706

_interface, dbus.Dictionary(),

1707

dbus.Array((dbus_name, )))

1708

else:

1709

dbus_value = transform_func(

1710

type_func(value),

1711

variant_level = variant_level)

1712

self.PropertyChanged(dbus.String(dbus_name),

1713

dbus_value)

1714

self.PropertiesChanged(

1715

_interface,

1716

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

1717

dbus_value }),

1718

dbus.Array())

1719

setattr(self, attrname, value)

1720

1721

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

1722

1723

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1724

approvals_pending = notifychangeproperty(dbus.Boolean,

1725

"ApprovalPending",

1726

type_func = bool)

1727

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

1728

last_enabled = notifychangeproperty(datetime_to_dbus,

1729

"LastEnabled")

1730

checker = notifychangeproperty(

1731

dbus.Boolean, "CheckerRunning",

1732

type_func = lambda checker: checker is not None)

1733

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1734

"LastCheckedOK")

1735

last_checker_status = notifychangeproperty(dbus.Int16,

1736

"LastCheckerStatus")

1737

last_approval_request = notifychangeproperty(

1738

datetime_to_dbus, "LastApprovalRequest")

1739

approved_by_default = notifychangeproperty(dbus.Boolean,

1740

"ApprovedByDefault")

1741

approval_delay = notifychangeproperty(

1742

dbus.UInt64, "ApprovalDelay",

1743

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

1744

approval_duration = notifychangeproperty(

1745

dbus.UInt64, "ApprovalDuration",

1746

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

1747

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

1748

timeout = notifychangeproperty(

1749

dbus.UInt64, "Timeout",

1750

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

1751

extended_timeout = notifychangeproperty(

1752

dbus.UInt64, "ExtendedTimeout",

1753

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

1754

interval = notifychangeproperty(

1755

dbus.UInt64, "Interval",

1756

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

1757

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

1758

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

1759

invalidate_only=True)

1760

1761

del notifychangeproperty

758

759

def _get_approvals_pending(self):

760

return self._approvals_pending

761

def _set_approvals_pending(self, value):

762

old_value = self._approvals_pending

763

self._approvals_pending = value

764

bval = bool(value)

765

if (hasattr(self, "dbus_object_path")

766

and bval is not bool(old_value)):

767

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

768

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

769

dbus_bool)

770

771

approvals_pending = property(_get_approvals_pending,

772

_set_approvals_pending)

773

del _get_approvals_pending, _set_approvals_pending

774

775

@staticmethod

776

def _datetime_to_dbus(dt, variant_level=0):

777

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

778

return dbus.String(dt.isoformat(),

779

variant_level=variant_level)

780

781

def enable(self):

782

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

783

r = Client.enable(self)

784

if oldstate != self.enabled:

785

# Emit D-Bus signals

786

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

787

dbus.Boolean(True, variant_level=1))

788

self.PropertyChanged(

789

dbus.String("LastEnabled"),

790

self._datetime_to_dbus(self.last_enabled,

791

variant_level=1))

792

return r

793

794

def disable(self, quiet = False):

795

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

796

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

797

if not quiet and oldstate != self.enabled:

798

# Emit D-Bus signal

799

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

800

dbus.Boolean(False, variant_level=1))

801

return r

1762

802

1763

803

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

1764

804

try:

1769

809

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

1770

810

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

1771

811

1772

def checker_callback(self, source, condition,

1773

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

1774

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

1775

connection, command, *args,

1776

**kwargs)

1777

exitstatus = self.last_checker_status

1778

if exitstatus >= 0:

812

def checker_callback(self, pid, condition, command,

813

*args, **kwargs):

814

self.checker_callback_tag = None

815

self.checker = None

816

# Emit D-Bus signal

817

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

818

dbus.Boolean(False, variant_level=1))

819

if os.WIFEXITED(condition):

820

exitstatus = os.WEXITSTATUS(condition)

1779

821

# Emit D-Bus signal

1780

822

self.CheckerCompleted(dbus.Int16(exitstatus),

1781

# This is specific to GNU libC

1782

dbus.Int64(exitstatus << 8),

823

dbus.Int64(condition),

1783

824

dbus.String(command))

1784

825

else:

1785

826

# Emit D-Bus signal

1786

827

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

1787

dbus.Int64(

1788

# This is specific to GNU libC

1789

(exitstatus << 8)

1790

| self.last_checker_signal),

828

dbus.Int64(condition),

1791

829

dbus.String(command))

1792

return ret

830

831

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

832

*args, **kwargs)

833

834

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

835

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

836

# Emit D-Bus signal

837

self.PropertyChanged(

838

dbus.String("LastCheckedOK"),

839

(self._datetime_to_dbus(self.last_checked_ok,

840

variant_level=1)))

841

842

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

843

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

844

# Emit D-Bus signal

845

self.PropertyChanged(

846

dbus.String("LastApprovalRequest"),

847

(self._datetime_to_dbus(self.last_approval_request,

848

variant_level=1)))

849

return r

1793

850

1794

851

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

1795

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

852

old_checker = self.checker

853

if self.checker is not None:

854

old_checker_pid = self.checker.pid

855

else:

856

old_checker_pid = None

1796

857

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

1797

858

# Only if new checker process was started

1798

859

if (self.checker is not None

1799

860

and old_checker_pid != self.checker.pid):

1800

861

# Emit D-Bus signal

1801

862

self.CheckerStarted(self.current_checker_command)

863

self.PropertyChanged(

864

dbus.String("CheckerRunning"),

865

dbus.Boolean(True, variant_level=1))

1802

866

return r

1803

867

868

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

869

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

870

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

871

if (old_checker is not None

872

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

873

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

874

dbus.Boolean(False, variant_level=1))

875

return r

876

1804

877

def _reset_approved(self):

1805

self.approved = None

878

self._approved = None

1806

879

return False

1807

880

1808

881

def approve(self, value=True):

1809

self.approved = value

1810

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

1811

* 1000), self._reset_approved)

1812

882

self.send_changedstate()

883

self._approved = value

884

gobject.timeout_add(self._timedelta_to_milliseconds

885

(self.approval_duration),

886

self._reset_approved)

887

1813

888

1814

889

## D-Bus methods, signals & properties

1815

1816

## Interfaces

890

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

1817

891

1818

892

## Signals

1819

893

1830

904

pass

1831

905

1832

906

# PropertyChanged - signal

1833

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

1834

907

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

1835

908

def PropertyChanged(self, property, value):

1836

909

"D-Bus signal"

1870

943

self.checked_ok()

1871

944

1872

945

# Enable - method

1873

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

1874

946

@dbus.service.method(_interface)

1875

947

def Enable(self):

1876

948

"D-Bus method"

1877

949

self.enable()

1878

950

1879

951

# StartChecker - method

1880

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

1881

952

@dbus.service.method(_interface)

1882

953

def StartChecker(self):

1883

954

"D-Bus method"

1884

955

self.start_checker()

1885

956

1886

957

# Disable - method

1887

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

1888

958

@dbus.service.method(_interface)

1889

959

def Disable(self):

1890

960

"D-Bus method"

1891

961

self.disable()

1892

962

1893

963

# StopChecker - method

1894

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

1895

964

@dbus.service.method(_interface)

1896

965

def StopChecker(self):

1897

966

self.stop_checker()

1904

973

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

1905

974

1906

975

# ApprovedByDefault - property

1907

@dbus_service_property(_interface,

1908

signature="b",

976

@dbus_service_property(_interface, signature="b",

1909

977

access="readwrite")

1910

978

def ApprovedByDefault_dbus_property(self, value=None):

1911

979

if value is None: # get

1912

980

return dbus.Boolean(self.approved_by_default)

1913

981

self.approved_by_default = bool(value)

982

# Emit D-Bus signal

983

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

984

dbus.Boolean(value, variant_level=1))

1914

985

1915

986

# ApprovalDelay - property

1916

@dbus_service_property(_interface,

1917

signature="t",

987

@dbus_service_property(_interface, signature="t",

1918

988

access="readwrite")

1919

989

def ApprovalDelay_dbus_property(self, value=None):

1920

990

if value is None: # get

1921

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

1922

* 1000)

991

return dbus.UInt64(self.approval_delay_milliseconds())

1923

992

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

993

# Emit D-Bus signal

994

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

995

dbus.UInt64(value, variant_level=1))

1924

996

1925

997

# ApprovalDuration - property

1926

@dbus_service_property(_interface,

1927

signature="t",

998

@dbus_service_property(_interface, signature="t",

1928

999

access="readwrite")

1929

1000

def ApprovalDuration_dbus_property(self, value=None):

1930

1001

if value is None: # get

1931

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

1932

* 1000)

1002

return dbus.UInt64(self._timedelta_to_milliseconds(

1003

self.approval_duration))

1933

1004

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

1005

# Emit D-Bus signal

1006

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

1007

dbus.UInt64(value, variant_level=1))

1934

1008

1935

1009

# Name - property

1936

@dbus_annotations(

1937

{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})

1938

1010

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

1939

1011

def Name_dbus_property(self):

1940

1012

return dbus.String(self.name)

1941

1013

1942

1014

# Fingerprint - property

1943

@dbus_annotations(

1944

{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})

1945

1015

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

1946

1016

def Fingerprint_dbus_property(self):

1947

1017

return dbus.String(self.fingerprint)

1948

1018

1949

1019

# Host - property

1950

@dbus_service_property(_interface,

1951

signature="s",

1020

@dbus_service_property(_interface, signature="s",

1952

1021

access="readwrite")

1953

1022

def Host_dbus_property(self, value=None):

1954

1023

if value is None: # get

1955

1024

return dbus.String(self.host)

1956

self.host = str(value)

1025

self.host = value

1026

# Emit D-Bus signal

1027

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

1028

dbus.String(value, variant_level=1))

1957

1029

1958

1030

# Created - property

1959

@dbus_annotations(

1960

{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})

1961

1031

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

1962

1032

def Created_dbus_property(self):

1963

return datetime_to_dbus(self.created)

1033

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

1964

1034

1965

1035

# LastEnabled - property

1966

1036

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

1967

1037

def LastEnabled_dbus_property(self):

1968

return datetime_to_dbus(self.last_enabled)

1038

if self.last_enabled is None:

1039

return dbus.String("")

1040

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

1969

1041

1970

1042

# Enabled - property

1971

@dbus_service_property(_interface,

1972

signature="b",

1043

@dbus_service_property(_interface, signature="b",

1973

1044

access="readwrite")

1974

1045

def Enabled_dbus_property(self, value=None):

1975

1046

if value is None: # get

1980

1051

self.disable()

1981

1052

1982

1053

# LastCheckedOK - property

1983

@dbus_service_property(_interface,

1984

signature="s",

1054

@dbus_service_property(_interface, signature="s",

1985

1055

access="readwrite")

1986

1056

def LastCheckedOK_dbus_property(self, value=None):

1987

1057

if value is not None:

1988

1058

self.checked_ok()

1989

1059

return

1990

return datetime_to_dbus(self.last_checked_ok)

1991

1992

# LastCheckerStatus - property

1993

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

1994

def LastCheckerStatus_dbus_property(self):

1995

return dbus.Int16(self.last_checker_status)

1996

1997

# Expires - property

1998

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

1999

def Expires_dbus_property(self):

2000

return datetime_to_dbus(self.expires)

1060

if self.last_checked_ok is None:

1061

return dbus.String("")

1062

return dbus.String(self._datetime_to_dbus(self

1063

.last_checked_ok))

2001

1064

2002

1065

# LastApprovalRequest - property

2003

1066

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

2004

1067

def LastApprovalRequest_dbus_property(self):

2005

return datetime_to_dbus(self.last_approval_request)

1068

if self.last_approval_request is None:

1069

return dbus.String("")

1070

return dbus.String(self.

1071

_datetime_to_dbus(self

1072

.last_approval_request))

2006

1073

2007

1074

# Timeout - property

2008

@dbus_service_property(_interface,

2009

signature="t",

1075

@dbus_service_property(_interface, signature="t",

2010

1076

access="readwrite")

2011

1077

def Timeout_dbus_property(self, value=None):

2012

1078

if value is None: # get

2013

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

2014

old_timeout = self.timeout

1079

return dbus.UInt64(self.timeout_milliseconds())

2015

1080

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

2016

# Reschedule disabling

2017

if self.enabled:

2018

now = datetime.datetime.utcnow()

2019

self.expires += self.timeout - old_timeout

2020

if self.expires <= now:

2021

# The timeout has passed

2022

self.disable()

2023

else:

2024

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

2025

is None):

2026

return

2027

GObject.source_remove(self.disable_initiator_tag)

2028

self.disable_initiator_tag = GObject.timeout_add(

2029

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

2030

self.disable)

2031

2032

# ExtendedTimeout - property

2033

@dbus_service_property(_interface,

2034

signature="t",

2035

access="readwrite")

2036

def ExtendedTimeout_dbus_property(self, value=None):

2037

if value is None: # get

2038

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

2039

* 1000)

2040

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

1081

# Emit D-Bus signal

1082

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

1083

dbus.UInt64(value, variant_level=1))

1084

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

1085

return

1086

# Reschedule timeout

1087

gobject.source_remove(self.disable_initiator_tag)

1088

self.disable_initiator_tag = None

1089

time_to_die = (self.

1090

_timedelta_to_milliseconds((self

1091

.last_checked_ok

1092

+ self.timeout)

1093

- datetime.datetime

1094

.utcnow()))

1095

if time_to_die <= 0:

1096

# The timeout has passed

1097

self.disable()

1098

else:

1099

self.disable_initiator_tag = (gobject.timeout_add

1100

(time_to_die, self.disable))

2041

1101

2042

1102

# Interval - property

2043

@dbus_service_property(_interface,

2044

signature="t",

1103

@dbus_service_property(_interface, signature="t",

2045

1104

access="readwrite")

2046

1105

def Interval_dbus_property(self, value=None):

2047

1106

if value is None: # get

2048

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

1107

return dbus.UInt64(self.interval_milliseconds())

2049

1108

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

1109

# Emit D-Bus signal

1110

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

1111

dbus.UInt64(value, variant_level=1))

2050

1112

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

2051

1113

return

2052

if self.enabled:

2053

# Reschedule checker run

2054

GObject.source_remove(self.checker_initiator_tag)

2055

self.checker_initiator_tag = GObject.timeout_add(

2056

value, self.start_checker)

2057

self.start_checker() # Start one now, too

2058

1114

# Reschedule checker run

1115

gobject.source_remove(self.checker_initiator_tag)

1116

self.checker_initiator_tag = (gobject.timeout_add

1117

(value, self.start_checker))

1118

self.start_checker() # Start one now, too

1119

2059

1120

# Checker - property

2060

@dbus_service_property(_interface,

2061

signature="s",

1121

@dbus_service_property(_interface, signature="s",

2062

1122

access="readwrite")

2063

1123

def Checker_dbus_property(self, value=None):

2064

1124

if value is None: # get

2065

1125

return dbus.String(self.checker_command)

2066

self.checker_command = str(value)

1126

self.checker_command = value

1127

# Emit D-Bus signal

1128

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

1129

dbus.String(self.checker_command,

1130

variant_level=1))

2067

1131

2068

1132

# CheckerRunning - property

2069

@dbus_service_property(_interface,

2070

signature="b",

1133

@dbus_service_property(_interface, signature="b",

2071

1134

access="readwrite")

2072

1135

def CheckerRunning_dbus_property(self, value=None):

2073

1136

if value is None: # get

2078

1141

self.stop_checker()

2079

1142

2080

1143

# ObjectPath - property

2081

@dbus_annotations(

2082

{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const",

2083

"org.freedesktop.DBus.Deprecated": "true"})

2084

1144

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

2085

1145

def ObjectPath_dbus_property(self):

2086

1146

return self.dbus_object_path # is already a dbus.ObjectPath

2087

1147

2088

1148

# Secret = property

2089

@dbus_annotations(

2090

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

2091

"invalidates"})

2092

@dbus_service_property(_interface,

2093

signature="ay",

2094

access="write",

2095

byte_arrays=True)

1149

@dbus_service_property(_interface, signature="ay",

1150

access="write", byte_arrays=True)

2096

1151

def Secret_dbus_property(self, value):

2097

self.secret = bytes(value)

1152

self.secret = str(value)

2098

1153

2099

1154

del _interface

2100

1155

2104

1159

self._pipe = child_pipe

2105

1160

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

2106

1161

if not self._pipe.recv():

2107

raise KeyError(fpr)

2108

1162

raise KeyError()

1163

2109

1164

def __getattribute__(self, name):

2110

if name == '_pipe':

1165

if(name == '_pipe'):

2111

1166

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

2112

1167

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

2113

1168

data = self._pipe.recv()

2114

1169

if data[0] == 'data':

2115

1170

return data[1]

2116

1171

if data[0] == 'function':

2117

2118

1172

def func(*args, **kwargs):

2119

1173

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

2120

1174

return self._pipe.recv()[1]

2121

2122

1175

return func

2123

1176

2124

1177

def __setattr__(self, name, value):

2125

if name == '_pipe':

1178

if(name == '_pipe'):

2126

1179

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

2127

1180

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

2128

1181

2136

1189

def handle(self):

2137

1190

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

2138

1191

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

2139

str(self.client_address))

1192

unicode(self.client_address))

2140

1193

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

2141

1194

self.server.child_pipe.fileno())

2142

2143

session = gnutls.ClientSession(self.request)

2144

1195

1196

session = (gnutls.connection

1197

.ClientSession(self.request,

1198

gnutls.connection

1199

.X509Credentials()))

1200

1201

# Note: gnutls.connection.X509Credentials is really a

1202

# generic GnuTLS certificate credentials object so long as

1203

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

1204

# here despite using OpenPGP certificates.

1205

2145

1206

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

2146

1207

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

2147

1208

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

2150

1211

priority = self.server.gnutls_priority

2151

1212

if priority is None:

2152

1213

priority = "NORMAL"

2153

gnutls.priority_set_direct(session._c_object, priority,

2154

None)

2155

1214

(gnutls.library.functions

1215

.gnutls_priority_set_direct(session._c_object,

1216

priority, None))

1217

2156

1218

# Start communication using the Mandos protocol

2157

1219

# Get protocol number

2158

1220

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

2159

1221

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

2160

1222

try:

2161

1223

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

2162

raise RuntimeError(line)

1224

raise RuntimeError

2163

1225

except (ValueError, IndexError, RuntimeError) as error:

2164

1226

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

2165

1227

return

2166

1228

2167

1229

# Start GnuTLS connection

2168

1230

try:

2169

1231

session.handshake()

2170

except gnutls.Error as error:

1232

except gnutls.errors.GNUTLSError as error:

2171

1233

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

2172

1234

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

2173

1235

# established. Just abandon the request.

2174

1236

return

2175

1237

logger.debug("Handshake succeeded")

2176

1238

2177

1239

approval_required = False

2178

1240

try:

2179

1241

try:

2180

fpr = self.fingerprint(

2181

self.peer_certificate(session))

2182

except (TypeError, gnutls.Error) as error:

1242

fpr = self.fingerprint(self.peer_certificate

1243

(session))

1244

except (TypeError,

1245

gnutls.errors.GNUTLSError) as error:

2183

1246

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

2184

1247

return

2185

1248

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

2186

1249

2187

1250

try:

2188

1251

client = ProxyClient(child_pipe, fpr,

2189

1252

self.client_address)

2197

1260

2198

1261

while True:

2199

1262

if not client.enabled:

2200

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

2201

client.name)

1263

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

1264

client.name)

2202

1265

if self.server.use_dbus:

2203

1266

# Emit D-Bus signal

2204

client.Rejected("Disabled")

1267

client.Rejected("Disabled")

2205

1268

return

2206

1269

2207

if client.approved or not client.approval_delay:

1270

if client._approved or not client.approval_delay:

2208

1271

#We are approved or approval is disabled

2209

1272

break

2210

elif client.approved is None:

1273

elif client._approved is None:

2211

1274

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

2212

1275

client.name)

2213

1276

if self.server.use_dbus:

2214

1277

# Emit D-Bus signal

2215

1278

client.NeedApproval(

2216

client.approval_delay.total_seconds()

2217

* 1000, client.approved_by_default)

1279

client.approval_delay_milliseconds(),

1280

client.approved_by_default)

2218

1281

else:

2219

1282

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

2220

1283

client.name)

2224

1287

return

2225

1288

2226

1289

#wait until timeout or approved

1290

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

2227

1291

time = datetime.datetime.now()

2228

1292

client.changedstate.acquire()

2229

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

1293

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

2230

1294

client.changedstate.release()

2231

1295

time2 = datetime.datetime.now()

2232

1296

if (time2 - time) >= delay:

2243

1307

else:

2244

1308

delay -= time2 - time

2245

1309

2246

try:

2247

session.send(client.secret)

2248

except gnutls.Error as error:

2249

logger.warning("gnutls send failed",

2250

exc_info = error)

2251

return

2252

1310

sent_size = 0

1311

while sent_size < len(client.secret):

1312

try:

1313

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

1314

except gnutls.errors.GNUTLSError as error:

1315

logger.warning("gnutls send failed")

1316

return

1317

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

1318

sent, len(client.secret)

1319

- (sent_size + sent))

1320

sent_size += sent

1321

2253

1322

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

2254

# bump the timeout using extended_timeout

2255

client.bump_timeout(client.extended_timeout)

1323

# bump the timeout as if seen

1324

client.checked_ok()

2256

1325

if self.server.use_dbus:

2257

1326

# Emit D-Bus signal

2258

1327

client.GotSecret()

2262

1331

client.approvals_pending -= 1

2263

1332

try:

2264

1333

session.bye()

2265

except gnutls.Error as error:

2266

logger.warning("GnuTLS bye failed",

2267

exc_info=error)

1334

except gnutls.errors.GNUTLSError as error:

1335

logger.warning("GnuTLS bye failed")

2268

1336

2269

1337

@staticmethod

2270

1338

def peer_certificate(session):

2271

1339

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

2272

1340

# If not an OpenPGP certificate...

2273

if (gnutls.certificate_type_get(session._c_object)

2274

!= gnutls.CRT_OPENPGP):

2275

# ...return invalid data

2276

return b""

1341

if (gnutls.library.functions

1342

.gnutls_certificate_type_get(session._c_object)

1343

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

1344

# ...do the normal thing

1345

return session.peer_certificate

2277

1346

list_size = ctypes.c_uint(1)

2278

cert_list = (gnutls.certificate_get_peers

1347

cert_list = (gnutls.library.functions

1348

.gnutls_certificate_get_peers

2279

1349

(session._c_object, ctypes.byref(list_size)))

2280

1350

if not bool(cert_list) and list_size.value != 0:

2281

raise gnutls.Error("error getting peer certificate")

1351

raise gnutls.errors.GNUTLSError("error getting peer"

1352

" certificate")

2282

1353

if list_size.value == 0:

2283

1354

return None

2284

1355

cert = cert_list[0]

2288

1359

def fingerprint(openpgp):

2289

1360

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

2290

1361

# New GnuTLS "datum" with the OpenPGP public key

2291

datum = gnutls.datum_t(

2292

ctypes.cast(ctypes.c_char_p(openpgp),

2293

ctypes.POINTER(ctypes.c_ubyte)),

2294

ctypes.c_uint(len(openpgp)))

1362

datum = (gnutls.library.types

1363

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

1364

ctypes.POINTER

1365

(ctypes.c_ubyte)),

1366

ctypes.c_uint(len(openpgp))))

2295

1367

# New empty GnuTLS certificate

2296

crt = gnutls.openpgp_crt_t()

2297

gnutls.openpgp_crt_init(ctypes.byref(crt))

1368

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1369

(gnutls.library.functions

1370

.gnutls_openpgp_crt_init(ctypes.byref(crt)))

2298

1371

# Import the OpenPGP public key into the certificate

2299

gnutls.openpgp_crt_import(crt, ctypes.byref(datum),

2300

gnutls.OPENPGP_FMT_RAW)

1372

(gnutls.library.functions

1373

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

1374

gnutls.library.constants

1375

.GNUTLS_OPENPGP_FMT_RAW))

2301

1376

# Verify the self signature in the key

2302

1377

crtverify = ctypes.c_uint()

2303

gnutls.openpgp_crt_verify_self(crt, 0,

2304

ctypes.byref(crtverify))

1378

(gnutls.library.functions

1379

.gnutls_openpgp_crt_verify_self(crt, 0,

1380

ctypes.byref(crtverify)))

2305

1381

if crtverify.value != 0:

2306

gnutls.openpgp_crt_deinit(crt)

2307

raise gnutls.CertificateSecurityError("Verify failed")

1382

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1383

raise (gnutls.errors.CertificateSecurityError

1384

("Verify failed"))

2308

1385

# New buffer for the fingerprint

2309

1386

buf = ctypes.create_string_buffer(20)

2310

1387

buf_len = ctypes.c_size_t()

2311

1388

# Get the fingerprint from the certificate into the buffer

2312

gnutls.openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),

2313

ctypes.byref(buf_len))

1389

(gnutls.library.functions

1390

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

1391

ctypes.byref(buf_len)))

2314

1392

# Deinit the certificate

2315

gnutls.openpgp_crt_deinit(crt)

1393

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2316

1394

# Convert the buffer to a Python bytestring

2317

1395

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

2318

1396

# Convert the bytestring to hexadecimal notation

2319

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

1397

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

2320

1398

return hex_fpr

2321

1399

2322

1400

2323

1401

class MultiprocessingMixIn(object):

2324

1402

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

2325

2326

1403

def sub_process_main(self, request, address):

2327

1404

try:

2328

1405

self.finish_request(request, address)

2329

except Exception:

1406

except:

2330

1407

self.handle_error(request, address)

2331

1408

self.close_request(request)

2332

1409

2333

1410

def process_request(self, request, address):

2334

1411

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

2335

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

2336

args = (request, address))

2337

proc.start()

2338

return proc

2339

1412

multiprocessing.Process(target = self.sub_process_main,

1413

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

2340

1414

2341

1415

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

2342

1416

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

2343

2344

1417

def process_request(self, request, client_address):

2345

1418

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

2346

1419

2347

1420

This function creates a new pipe in self.pipe

2348

1421

"""

2349

1422

parent_pipe, self.child_pipe = multiprocessing.Pipe()

2350

2351

proc = MultiprocessingMixIn.process_request(self, request,

2352

client_address)

1423

1424

super(MultiprocessingMixInWithPipe,

1425

self).process_request(request, client_address)

2353

1426

self.child_pipe.close()

2354

self.add_pipe(parent_pipe, proc)

2355

2356

def add_pipe(self, parent_pipe, proc):

1427

self.add_pipe(parent_pipe)

1428

1429

def add_pipe(self, parent_pipe):

2357

1430

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

2358

raise NotImplementedError()

2359

1431

raise NotImplementedError

2360

1432

2361

1433

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

2362

1434

socketserver.TCPServer, object):

2367

1439

interface: None or a network interface name (string)

2368

1440

use_ipv6: Boolean; to use IPv6 or not

2369

1441

"""

2370

2371

1442

def __init__(self, server_address, RequestHandlerClass,

2372

interface=None,

2373

use_ipv6=True,

2374

socketfd=None):

2375

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

2376

creating a new one with socket.socket().

2377

"""

1443

interface=None, use_ipv6=True):

2378

1444

self.interface = interface

2379

1445

if use_ipv6:

2380

1446

self.address_family = socket.AF_INET6

2381

if socketfd is not None:

2382

# Save the file descriptor

2383

self.socketfd = socketfd

2384

# Save the original socket.socket() function

2385

self.socket_socket = socket.socket

2386

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

2387

#

2388

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

2389

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

2390

# patching socket.socket.)

2391

#

2392

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

2393

@functools.wraps(socket.socket)

2394

def socket_wrapper(*args, **kwargs):

2395

# Restore original function so subsequent calls are

2396

# not affected.

2397

socket.socket = self.socket_socket

2398

del self.socket_socket

2399

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

2400

# saved file descriptor.

2401

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

2402

# Replace socket.socket() function with wrapper

2403

socket.socket = socket_wrapper

2404

# The socketserver.TCPServer.__init__ will call

2405

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

2406

# socket_wrapper(), if socketfd was set.

2407

1447

socketserver.TCPServer.__init__(self, server_address,

2408

1448

RequestHandlerClass)

2409

2410

1449

def server_bind(self):

2411

1450

"""This overrides the normal server_bind() function

2412

1451

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

2418

1457

self.interface)

2419

1458

else:

2420

1459

try:

2421

self.socket.setsockopt(

2422

socket.SOL_SOCKET, SO_BINDTODEVICE,

2423

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

1460

self.socket.setsockopt(socket.SOL_SOCKET,

1461

SO_BINDTODEVICE,

1462

str(self.interface

1463

+ '\0'))

2424

1464

except socket.error as error:

2425

if error.errno == errno.EPERM:

2426

logger.error("No permission to bind to"

2427

" interface %s", self.interface)

2428

elif error.errno == errno.ENOPROTOOPT:

1465

if error[0] == errno.EPERM:

1466

logger.error("No permission to"

1467

" bind to interface %s",

1468

self.interface)

1469

elif error[0] == errno.ENOPROTOOPT:

2429

1470

logger.error("SO_BINDTODEVICE not available;"

2430

1471

" cannot bind to interface %s",

2431

1472

self.interface)

2432

elif error.errno == errno.ENODEV:

2433

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

2434

" cannot bind", self.interface)

2435

1473

else:

2436

1474

raise

2437

1475

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

2440

1478

if self.address_family == socket.AF_INET6:

2441

1479

any_address = "::" # in6addr_any

2442

1480

else:

2443

any_address = "0.0.0.0" # INADDR_ANY

1481

any_address = socket.INADDR_ANY

2444

1482

self.server_address = (any_address,

2445

1483

self.server_address[1])

2446

1484

elif not self.server_address[1]:

2447

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

1485

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

1486

0)

2448

1487

# if self.interface:

2449

1488

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

2450

1489

# 0, # port

2462

1501

gnutls_priority GnuTLS priority string

2463

1502

use_dbus: Boolean; to emit D-Bus signals or not

2464

1503

2465

Assumes a GObject.MainLoop event loop.

1504

Assumes a gobject.MainLoop event loop.

2466

1505

"""

2467

2468

1506

def __init__(self, server_address, RequestHandlerClass,

2469

interface=None,

2470

use_ipv6=True,

2471

clients=None,

2472

gnutls_priority=None,

2473

use_dbus=True,

2474

socketfd=None):

1507

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

1508

gnutls_priority=None, use_dbus=True):

2475

1509

self.enabled = False

2476

1510

self.clients = clients

2477

1511

if self.clients is None:

2478

self.clients = {}

1512

self.clients = set()

2479

1513

self.use_dbus = use_dbus

2480

1514

self.gnutls_priority = gnutls_priority

2481

1515

IPv6_TCPServer.__init__(self, server_address,

2482

1516

RequestHandlerClass,

2483

1517

interface = interface,

2484

use_ipv6 = use_ipv6,

2485

socketfd = socketfd)

2486

1518

use_ipv6 = use_ipv6)

2487

1519

def server_activate(self):

2488

1520

if self.enabled:

2489

1521

return socketserver.TCPServer.server_activate(self)

2490

2491

1522

def enable(self):

2492

1523

self.enabled = True

2493

2494

def add_pipe(self, parent_pipe, proc):

1524

def add_pipe(self, parent_pipe):

2495

1525

# Call "handle_ipc" for both data and EOF events

2496

GObject.io_add_watch(

2497

parent_pipe.fileno(),

2498

GObject.IO_IN | GObject.IO_HUP,

2499

functools.partial(self.handle_ipc,

2500

parent_pipe = parent_pipe,

2501

proc = proc))

2502

2503

def handle_ipc(self, source, condition,

2504

parent_pipe=None,

2505

proc = None,

1526

gobject.io_add_watch(parent_pipe.fileno(),

1527

gobject.IO_IN | gobject.IO_HUP,

1528

functools.partial(self.handle_ipc,

1529

parent_pipe = parent_pipe))

1530

1531

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

2506

1532

client_object=None):

2507

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

2508

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

2509

# Wait for other process to exit

2510

proc.join()

1533

condition_names = {

1534

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

1535

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

1536

# blocking).

1537

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

1538

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

1539

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

1540

# broken, usually for pipes and

1541

# sockets).

1542

}

1543

conditions_string = ' | '.join(name

1544

for cond, name in

1545

condition_names.iteritems()

1546

if cond & condition)

1547

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

1548

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

2511

1549

return False

2512

1550

2513

1551

# Read a request from the child

2518

1556

fpr = request[1]

2519

1557

address = request[2]

2520

1558

2521

for c in self.clients.itervalues():

1559

for c in self.clients:

2522

1560

if c.fingerprint == fpr:

2523

1561

client = c

2524

1562

break

2525

1563

else:

2526

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

2527

"dress: %s", fpr, address)

1564

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

1565

"dress: %s", fpr, address)

2528

1566

if self.use_dbus:

2529

1567

# Emit D-Bus signal

2530

mandos_dbus_service.ClientNotFound(fpr,

2531

address[0])

1568

mandos_dbus_service.ClientNotFound(fpr, address[0])

2532

1569

parent_pipe.send(False)

2533

1570

return False

2534

1571

2535

GObject.io_add_watch(

2536

parent_pipe.fileno(),

2537

GObject.IO_IN | GObject.IO_HUP,

2538

functools.partial(self.handle_ipc,

2539

parent_pipe = parent_pipe,

2540

proc = proc,

2541

client_object = client))

1572

gobject.io_add_watch(parent_pipe.fileno(),

1573

gobject.IO_IN | gobject.IO_HUP,

1574

functools.partial(self.handle_ipc,

1575

parent_pipe = parent_pipe,

1576

client_object = client))

2542

1577

parent_pipe.send(True)

2543

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

2544

# same fileno

1578

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

2545

1579

return False

2546

1580

if command == 'funcall':

2547

1581

funcname = request[1]

2548

1582

args = request[2]

2549

1583

kwargs = request[3]

2550

1584

2551

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

2552

funcname)(*args,

2553

**kwargs)))

2554

1585

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

1586

2555

1587

if command == 'getattr':

2556

1588

attrname = request[1]

2557

if isinstance(client_object.__getattribute__(attrname),

2558

collections.Callable):

2559

parent_pipe.send(('function', ))

1589

if callable(client_object.__getattribute__(attrname)):

1590

parent_pipe.send(('function',))

2560

1591

else:

2561

parent_pipe.send((

2562

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

1592

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

2563

1593

2564

1594

if command == 'setattr':

2565

1595

attrname = request[1]

2566

1596

value = request[2]

2567

1597

setattr(client_object, attrname, value)

2568

1598

2569

1599

return True

2570

1600

2571

1601

2572

def rfc3339_duration_to_delta(duration):

2573

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

2574

2575

>>> rfc3339_duration_to_delta("P7D")

2576

datetime.timedelta(7)

2577

>>> rfc3339_duration_to_delta("PT60S")

2578

datetime.timedelta(0, 60)

2579

>>> rfc3339_duration_to_delta("PT60M")

2580

datetime.timedelta(0, 3600)

2581

>>> rfc3339_duration_to_delta("PT24H")

2582

datetime.timedelta(1)

2583

>>> rfc3339_duration_to_delta("P1W")

2584

datetime.timedelta(7)

2585

>>> rfc3339_duration_to_delta("PT5M30S")

2586

datetime.timedelta(0, 330)

2587

>>> rfc3339_duration_to_delta("P1DT3M20S")

2588

datetime.timedelta(1, 200)

2589

"""

2590

2591

# Parsing an RFC 3339 duration with regular expressions is not

2592

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

2593

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

2594

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

2595

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

2596

# avoid excessive use of external libraries.

2597

2598

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

2599

Token = collections.namedtuple("Token", (

2600

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

2601

# a "group" containing digits

2602

"value", # datetime.timedelta or None

2603

"followers")) # Tokens valid after this token

2604

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

2605

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

2606

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

2607

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

2608

datetime.timedelta(seconds=1),

2609

frozenset((token_end, )))

2610

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

2611

datetime.timedelta(minutes=1),

2612

frozenset((token_second, token_end)))

2613

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

2614

datetime.timedelta(hours=1),

2615

frozenset((token_minute, token_end)))

2616

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

2617

None,

2618

frozenset((token_hour, token_minute,

2619

token_second)))

2620

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

2621

datetime.timedelta(days=1),

2622

frozenset((token_time, token_end)))

2623

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

2624

datetime.timedelta(weeks=4),

2625

frozenset((token_day, token_end)))

2626

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

2627

datetime.timedelta(weeks=52),

2628

frozenset((token_month, token_end)))

2629

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

2630

datetime.timedelta(weeks=1),

2631

frozenset((token_end, )))

2632

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

2633

frozenset((token_year, token_month,

2634

token_day, token_time,

2635

token_week)))

2636

# Define starting values

2637

value = datetime.timedelta() # Value so far

2638

found_token = None

2639

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

2640

s = duration # String left to parse

2641

# Loop until end token is found

2642

while found_token is not token_end:

2643

# Search for any currently valid tokens

2644

for token in followers:

2645

match = token.regexp.match(s)

2646

if match is not None:

2647

# Token found

2648

if token.value is not None:

2649

# Value found, parse digits

2650

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

2651

# Add to value so far

2652

value += factor * token.value

2653

# Strip token from string

2654

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

2655

# Go to found token

2656

found_token = token

2657

# Set valid next tokens

2658

followers = found_token.followers

2659

break

2660

else:

2661

# No currently valid tokens were found

2662

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

2663

.format(duration))

2664

# End token found

2665

return value

2666

2667

2668

1602

def string_to_delta(interval):

2669

1603

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

2670

1604

2681

1615

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

2682

1616

datetime.timedelta(0, 330)

2683

1617

"""

2684

2685

try:

2686

return rfc3339_duration_to_delta(interval)

2687

except ValueError:

2688

pass

2689

2690

1618

timevalue = datetime.timedelta(0)

2691

1619

for s in interval.split():

2692

1620

try:

2693

suffix = s[-1]

1621

suffix = unicode(s[-1])

2694

1622

value = int(s[:-1])

2695

1623

if suffix == "d":

2696

1624

delta = datetime.timedelta(value)

2703

1631

elif suffix == "w":

2704

1632

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

2705

1633

else:

2706

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

2707

except IndexError as e:

1634

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

1635

except (ValueError, IndexError) as e:

2708

1636

raise ValueError(*(e.args))

2709

1637

timevalue += delta

2710

1638

return timevalue

2711

1639

2712

1640

1641

def if_nametoindex(interface):

1642

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

1643

1644

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

1645

global if_nametoindex

1646

try:

1647

if_nametoindex = (ctypes.cdll.LoadLibrary

1648

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

1649

.if_nametoindex)

1650

except (OSError, AttributeError):

1651

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

1652

def if_nametoindex(interface):

1653

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

1654

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

1655

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

1656

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1657

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

1658

interface))

1659

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

1660

ifreq[16:20])[0]

1661

return interface_index

1662

return if_nametoindex(interface)

1663

1664

2713

1665

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

2714

1666

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

2715

1667

2723

1675

sys.exit()

2724

1676

if not noclose:

2725

1677

# Close all standard open file descriptors

2726

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

1678

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

2727

1679

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

2728

1680

raise OSError(errno.ENODEV,

2729

"{} not a character device"

2730

.format(os.devnull))

1681

"%s not a character device"

1682

% os.path.devnull)

2731

1683

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

2732

1684

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

2733

1685

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

2742

1694

2743

1695

parser = argparse.ArgumentParser()

2744

1696

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

2745

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

1697

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

2746

1698

help="show version number and exit")

2747

1699

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

2748

1700

help="Bind to interface IF")

2754

1706

help="Run self-test")

2755

1707

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

2756

1708

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

2757

" to terminal", default=None)

1709

" to terminal")

2758

1710

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

2759

1711

help="Debug level for stdout output")

2760

1712

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

2767

1719

" files")

2768

1720

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

2769

1721

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

2770

" system bus interface", default=None)

1722

" system bus interface")

2771

1723

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

2772

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

2773

default=None)

2774

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

2775

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

2776

" state", default=None)

2777

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

2778

help="Specify a file descriptor to a network"

2779

" socket to use instead of creating one")

2780

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

2781

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

2782

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

2783

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

2784

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

2785

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

2786

default=None)

2787

1724

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

2788

1725

options = parser.parse_args()

2789

1726

2790

1727

if options.check:

2791

1728

import doctest

2792

fail_count, test_count = doctest.testmod()

2793

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

1729

doctest.testmod()

1730

sys.exit()

2794

1731

2795

1732

# Default values for config file for server-global settings

2796

1733

server_defaults = { "interface": "",

2798

1735

"port": "",

2799

1736

"debug": "False",

2800

1737

"priority":

2801

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

2802

":+SIGN-DSA-SHA256",

1738

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

2803

1739

"servicename": "Mandos",

2804

1740

"use_dbus": "True",

2805

1741

"use_ipv6": "True",

2806

1742

"debuglevel": "",

2807

"restore": "True",

2808

"socket": "",

2809

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

2810

"foreground": "False",

2811

"zeroconf": "True",

2812

}

1743

}

2813

1744

2814

1745

# Parse config file for server-global settings

2815

1746

server_config = configparser.SafeConfigParser(server_defaults)

2816

1747

del server_defaults

2817

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

1748

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

1749

"mandos.conf"))

2818

1750

# Convert the SafeConfigParser object to a dict

2819

1751

server_settings = server_config.defaults()

2820

1752

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

2821

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

1753

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

2822

1754

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

2823

1755

option)

2824

1756

if server_settings["port"]:

2825

1757

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

2826

1758

"port")

2827

if server_settings["socket"]:

2828

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

2829

"socket")

2830

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

2831

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

2832

# happen with a supplied network socket.

2833

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

2834

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

2835

["socket"])

2836

1759

del server_config

2837

1760

2838

1761

# Override the settings from the config file with command line

2839

1762

# options, if set.

2840

1763

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

2841

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

2842

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

2843

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

1764

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

1765

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

2844

1766

value = getattr(options, option)

2845

1767

if value is not None:

2846

1768

server_settings[option] = value

2847

1769

del options

2848

1770

# Force all strings to be unicode

2849

1771

for option in server_settings.keys():

2850

if isinstance(server_settings[option], bytes):

2851

server_settings[option] = (server_settings[option]

2852

.decode("utf-8"))

2853

# Force all boolean options to be boolean

2854

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

2855

"foreground", "zeroconf"):

2856

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

2857

# Debug implies foreground

2858

if server_settings["debug"]:

2859

server_settings["foreground"] = True

1772

if type(server_settings[option]) is str:

1773

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

2860

1774

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

2861

1775

2862

1776

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

2863

1777

2864

if (not server_settings["zeroconf"]

2865

and not (server_settings["port"]

2866

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

2867

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

2868

2869

1778

# For convenience

2870

1779

debug = server_settings["debug"]

2871

1780

debuglevel = server_settings["debuglevel"]

2872

1781

use_dbus = server_settings["use_dbus"]

2873

1782

use_ipv6 = server_settings["use_ipv6"]

2874

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

2875

stored_state_file)

2876

foreground = server_settings["foreground"]

2877

zeroconf = server_settings["zeroconf"]

2878

2879

if debug:

2880

initlogger(debug, logging.DEBUG)

2881

else:

2882

if not debuglevel:

2883

initlogger(debug)

2884

else:

2885

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

2886

initlogger(debug, level)

2887

1783

2888

1784

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

2889

syslogger.setFormatter(

2890

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

2891

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

2892

server_settings["servicename"])))

1785

syslogger.setFormatter(logging.Formatter

1786

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

1787

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

1788

% server_settings["servicename"]))

2893

1789

2894

1790

# Parse config file with clients

2895

client_config = configparser.SafeConfigParser(Client

2896

.client_defaults)

1791

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

1792

"interval": "5m",

1793

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

1794

"host": "",

1795

"approval_delay": "0s",

1796

"approval_duration": "1s",

1797

}

1798

client_config = configparser.SafeConfigParser(client_defaults)

2897

1799

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

2898

1800

"clients.conf"))

2899

1801

2900

1802

global mandos_dbus_service

2901

1803

mandos_dbus_service = None

2902

1804

2903

socketfd = None

2904

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

2905

socketfd = server_settings["socket"]

2906

tcp_server = MandosServer(

2907

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

2908

ClientHandler,

2909

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

2910

use_ipv6=use_ipv6,

2911

gnutls_priority=server_settings["priority"],

2912

use_dbus=use_dbus,

2913

socketfd=socketfd)

2914

if not foreground:

2915

pidfilename = "/run/mandos.pid"

2916

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

2917

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

2918

pidfile = None

1805

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

1806

server_settings["port"]),

1807

ClientHandler,

1808

interface=(server_settings["interface"]

1809

or None),

1810

use_ipv6=use_ipv6,

1811

gnutls_priority=

1812

server_settings["priority"],

1813

use_dbus=use_dbus)

1814

if not debug:

1815

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

2919

1816

try:

2920

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

2921

except IOError as e:

2922

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

2923

exc_info=e)

1817

pidfile = open(pidfilename, "w")

1818

except IOError:

1819

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

2924

1820

2925

for name, group in (("_mandos", "_mandos"),

2926

("mandos", "mandos"),

2927

("nobody", "nogroup")):

1821

try:

1822

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

1823

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

1824

except KeyError:

2928

1825

try:

2929

uid = pwd.getpwnam(name).pw_uid

2930

gid = pwd.getpwnam(group).pw_gid

2931

break

1826

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

1827

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

2932

1828

except KeyError:

2933

continue

2934

else:

2935

uid = 65534

2936

gid = 65534

1829

try:

1830

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

1831

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

1832

except KeyError:

1833

uid = 65534

1834

gid = 65534

2937

1835

try:

2938

1836

os.setgid(gid)

2939

1837

os.setuid(uid)

2940

1838

except OSError as error:

2941

if error.errno != errno.EPERM:

2942

raise

1839

if error[0] != errno.EPERM:

1840

raise error

2943

1841

1842

if not debug and not debuglevel:

1843

syslogger.setLevel(logging.WARNING)

1844

console.setLevel(logging.WARNING)

1845

if debuglevel:

1846

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

1847

syslogger.setLevel(level)

1848

console.setLevel(level)

1849

2944

1850

if debug:

2945

1851

# Enable all possible GnuTLS debugging

2946

1852

2947

1853

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

2948

1854

# - GnuTLS manual

2949

gnutls.global_set_log_level(11)

1855

gnutls.library.functions.gnutls_global_set_log_level(11)

2950

1856

2951

@gnutls.log_func

1857

@gnutls.library.types.gnutls_log_func

2952

1858

def debug_gnutls(level, string):

2953

1859

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

2954

1860

2955

gnutls.global_set_log_function(debug_gnutls)

1861

(gnutls.library.functions

1862

.gnutls_global_set_log_function(debug_gnutls))

2956

1863

2957

1864

# Redirect stdin so all checkers get /dev/null

2958

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

1865

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

2959

1866

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

2960

1867

if null > 2:

2961

1868

os.close(null)

1869

else:

1870

# No console logging

1871

logger.removeHandler(console)

2962

1872

2963

1873

# Need to fork before connecting to D-Bus

2964

if not foreground:

1874

if not debug:

2965

1875

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

2966

1876

daemon()

2967

1877

2968

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

2969

# need to inform GObject that threads will be used.

2970

GObject.threads_init()

2971

2972

1878

global main_loop

2973

1879

# From the Avahi example code

2974

DBusGMainLoop(set_as_default=True)

2975

main_loop = GObject.MainLoop()

1880

DBusGMainLoop(set_as_default=True )

1881

main_loop = gobject.MainLoop()

2976

1882

bus = dbus.SystemBus()

2977

1883

# End of Avahi example code

2978

1884

if use_dbus:

2979

1885

try:

2980

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

2981

bus,

2982

do_not_queue=True)

2983

old_bus_name = dbus.service.BusName(

2984

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

2985

do_not_queue=True)

2986

except dbus.exceptions.DBusException as e:

2987

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

1886

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

1887

bus, do_not_queue=True)

1888

except dbus.exceptions.NameExistsException as e:

1889

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

2988

1890

use_dbus = False

2989

1891

server_settings["use_dbus"] = False

2990

1892

tcp_server.use_dbus = False

2991

if zeroconf:

2992

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2993

service = AvahiServiceToSyslog(

2994

name = server_settings["servicename"],

2995

servicetype = "_mandos._tcp",

2996

protocol = protocol,

2997

bus = bus)

2998

if server_settings["interface"]:

2999

service.interface = if_nametoindex(

3000

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

1893

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

1894

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

1895

servicetype = "_mandos._tcp",

1896

protocol = protocol, bus = bus)

1897

if server_settings["interface"]:

1898

service.interface = (if_nametoindex

1899

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

3001

1900

3002

1901

global multiprocessing_manager

3003

1902

multiprocessing_manager = multiprocessing.Manager()

3005

1904

client_class = Client

3006

1905

if use_dbus:

3007

1906

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

3008

3009

client_settings = Client.config_parser(client_config)

3010

old_client_settings = {}

3011

clients_data = {}

3012

3013

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

3014

global wnull

3015

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

3016

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

3017

# mode

3018

if debug or not foreground:

3019

wnull.close()

3020

3021

# Get client data and settings from last running state.

3022

if server_settings["restore"]:

3023

try:

3024

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

3025

clients_data, old_client_settings = pickle.load(

3026

stored_state)

3027

os.remove(stored_state_path)

3028

except IOError as e:

3029

if e.errno == errno.ENOENT:

3030

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

3031

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

3032

else:

3033

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

3034

exc_info=e)

3035

raise

3036

except EOFError as e:

3037

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

3038

"EOFError:",

3039

exc_info=e)

3040

3041

with PGPEngine() as pgp:

3042

for client_name, client in clients_data.items():

3043

# Skip removed clients

3044

if client_name not in client_settings:

3045

continue

3046

3047

# Decide which value to use after restoring saved state.

3048

# We have three different values: Old config file,

3049

# new config file, and saved state.

3050

# New config value takes precedence if it differs from old

3051

# config value, otherwise use saved state.

3052

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

3053

try:

3054

# For each value in new config, check if it

3055

# differs from the old config value (Except for

3056

# the "secret" attribute)

3057

if (name != "secret"

3058

and (value !=

3059

old_client_settings[client_name][name])):

3060

client[name] = value

3061

except KeyError:

3062

pass

3063

3064

# Clients who has passed its expire date can still be

3065

# enabled if its last checker was successful. A Client

3066

# whose checker succeeded before we stored its state is

3067

# assumed to have successfully run all checkers during

3068

# downtime.

3069

if client["enabled"]:

3070

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

3071

if not client["last_checked_ok"]:

3072

logger.warning(

3073

"disabling client {} - Client never "

3074

"performed a successful checker".format(

3075

client_name))

3076

client["enabled"] = False

3077

elif client["last_checker_status"] != 0:

3078

logger.warning(

3079

"disabling client {} - Client last"

3080

" checker failed with error code"

3081

" {}".format(

3082

client_name,

3083

client["last_checker_status"]))

3084

client["enabled"] = False

3085

else:

3086

client["expires"] = (

3087

datetime.datetime.utcnow()

3088

+ client["timeout"])

3089

logger.debug("Last checker succeeded,"

3090

" keeping {} enabled".format(

3091

client_name))

1907

def client_config_items(config, section):

1908

special_settings = {

1909

"approved_by_default":

1910

lambda: config.getboolean(section,

1911

"approved_by_default"),

1912

}

1913

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

3092

1914

try:

3093

client["secret"] = pgp.decrypt(

3094

client["encrypted_secret"],

3095

client_settings[client_name]["secret"])

3096

except PGPError:

3097

# If decryption fails, we use secret from new settings

3098

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

3099

client_name))

3100

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

3101

["secret"])

3102

3103

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

3104

for client_name in (set(old_client_settings)

3105

- set(client_settings)):

3106

del clients_data[client_name]

3107

for client_name in (set(client_settings)

3108

- set(old_client_settings)):

3109

clients_data[client_name] = client_settings[client_name]

3110

3111

# Create all client objects

3112

for client_name, client in clients_data.items():

3113

tcp_server.clients[client_name] = client_class(

3114

name = client_name,

3115

settings = client,

3116

server_settings = server_settings)

3117

1915

yield (name, special_settings[name]())

1916

except KeyError:

1917

yield (name, value)

1918

1919

tcp_server.clients.update(set(

1920

client_class(name = section,

1921

config= dict(client_config_items(

1922

client_config, section)))

1923

for section in client_config.sections()))

3118

1924

if not tcp_server.clients:

3119

1925

logger.warning("No clients defined")

3120

3121

if not foreground:

3122

if pidfile is not None:

3123

pid = os.getpid()

3124

try:

3125

with pidfile:

3126

print(pid, file=pidfile)

3127

except IOError:

3128

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

3129

pidfilename, pid)

3130

del pidfile

1926

1927

if not debug:

1928

try:

1929

with pidfile:

1930

pid = os.getpid()

1931

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

1932

del pidfile

1933

except IOError:

1934

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

1935

pidfilename, pid)

1936

except NameError:

1937

# "pidfile" was never created

1938

pass

3131

1939

del pidfilename

3132

1940

1941

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

1942

3133

1943

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

3134

1944

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

3135

1945

3136

1946

if use_dbus:

3137

3138

@alternate_dbus_interfaces(

3139

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

3140

class MandosDBusService(DBusObjectWithObjectManager):

1947

class MandosDBusService(dbus.service.Object):

3141

1948

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

3142

3143

1949

def __init__(self):

3144

1950

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

3145

3146

_interface = "se.recompile.Mandos"

1951

_interface = "se.bsnet.fukt.Mandos"

3147

1952

3148

1953

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

3149

1954

def ClientAdded(self, objpath):

3155

1960

"D-Bus signal"

3156

1961

pass

3157

1962

3158

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

3159

"true"})

3160

1963

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

3161

1964

def ClientRemoved(self, objpath, name):

3162

1965

"D-Bus signal"

3163

1966

pass

3164

1967

3165

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

3166

"true"})

3167

1968

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

3168

1969

def GetAllClients(self):

3169

1970

"D-Bus method"

3170

return dbus.Array(c.dbus_object_path for c in

3171

tcp_server.clients.itervalues())

1971

return dbus.Array(c.dbus_object_path

1972

for c in tcp_server.clients)

3172

1973

3173

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

3174

"true"})

3175

1974

@dbus.service.method(_interface,

3176

1975

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

3177

1976

def GetAllClientsWithProperties(self):

3178

1977

"D-Bus method"

3179

1978

return dbus.Dictionary(

3180

{ c.dbus_object_path: c.GetAll(

3181

"se.recompile.Mandos.Client")

3182

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

1979

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

1980

for c in tcp_server.clients),

3183

1981

signature="oa{sv}")

3184

1982

3185

1983

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

3186

1984

def RemoveClient(self, object_path):

3187

1985

"D-Bus method"

3188

for c in tcp_server.clients.itervalues():

1986

for c in tcp_server.clients:

3189

1987

if c.dbus_object_path == object_path:

3190

del tcp_server.clients[c.name]

1988

tcp_server.clients.remove(c)

3191

1989

c.remove_from_connection()

3192

# Don't signal the disabling

1990

# Don't signal anything except ClientRemoved

3193

1991

c.disable(quiet=True)

3194

# Emit D-Bus signal for removal

3195

self.client_removed_signal(c)

1992

# Emit D-Bus signal

1993

self.ClientRemoved(object_path, c.name)

3196

1994

return

3197

1995

raise KeyError(object_path)

3198

1996

3199

1997

del _interface

3200

3201

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

3202

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

3203

def GetManagedObjects(self):

3204

"""D-Bus method"""

3205

return dbus.Dictionary(

3206

{ client.dbus_object_path:

3207

dbus.Dictionary(

3208

{ interface: client.GetAll(interface)

3209

for interface in

3210

client._get_all_interface_names()})

3211

for client in tcp_server.clients.values()})

3212

3213

def client_added_signal(self, client):

3214

"""Send the new standard signal and the old signal"""

3215

if use_dbus:

3216

# New standard signal

3217

self.InterfacesAdded(

3218

client.dbus_object_path,

3219

dbus.Dictionary(

3220

{ interface: client.GetAll(interface)

3221

for interface in

3222

client._get_all_interface_names()}))

3223

# Old signal

3224

self.ClientAdded(client.dbus_object_path)

3225

3226

def client_removed_signal(self, client):

3227

"""Send the new standard signal and the old signal"""

3228

if use_dbus:

3229

# New standard signal

3230

self.InterfacesRemoved(

3231

client.dbus_object_path,

3232

client._get_all_interface_names())

3233

# Old signal

3234

self.ClientRemoved(client.dbus_object_path,

3235

client.name)

3236

1998

3237

1999

mandos_dbus_service = MandosDBusService()

3238

2000

3239

2001

def cleanup():

3240

2002

"Cleanup function; run on exit"

3241

if zeroconf:

3242

service.cleanup()

3243

3244

multiprocessing.active_children()

3245

wnull.close()

3246

if not (tcp_server.clients or client_settings):

3247

return

3248

3249

# Store client before exiting. Secrets are encrypted with key

3250

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

3251

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

3252

clients = {}

3253

with PGPEngine() as pgp:

3254

for client in tcp_server.clients.itervalues():

3255

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

3256

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

3257

key)

3258

client_dict = {}

3259

3260

# A list of attributes that can not be pickled

3261

# + secret.

3262

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

3263

"checker", "server_settings" }

3264

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

3265

.Object):

3266

exclude.add(name)

3267

3268

client_dict["encrypted_secret"] = (client

3269

.encrypted_secret)

3270

for attr in client.client_structure:

3271

if attr not in exclude:

3272

client_dict[attr] = getattr(client, attr)

3273

3274

clients[client.name] = client_dict

3275

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

3276

3277

try:

3278

with tempfile.NamedTemporaryFile(

3279

mode='wb',

3280

suffix=".pickle",

3281

prefix='clients-',

3282

dir=os.path.dirname(stored_state_path),

3283

delete=False) as stored_state:

3284

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

3285

tempname = stored_state.name

3286

os.rename(tempname, stored_state_path)

3287

except (IOError, OSError) as e:

3288

if not debug:

3289

try:

3290

os.remove(tempname)

3291

except NameError:

3292

pass

3293

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

3294

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

3295

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

3296

else:

3297

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

3298

exc_info=e)

3299

raise

3300

3301

# Delete all clients, and settings from config

2003

service.cleanup()

2004

3302

2005

while tcp_server.clients:

3303

name, client = tcp_server.clients.popitem()

2006

client = tcp_server.clients.pop()

3304

2007

if use_dbus:

3305

2008

client.remove_from_connection()

3306

# Don't signal the disabling

2009

client.disable_hook = None

2010

# Don't signal anything except ClientRemoved

3307

2011

client.disable(quiet=True)

3308

# Emit D-Bus signal for removal

3309

2012

if use_dbus:

3310

mandos_dbus_service.client_removed_signal(client)

3311

client_settings.clear()

2013

# Emit D-Bus signal

2014

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2015

client.name)

3312

2016

3313

2017

atexit.register(cleanup)

3314

2018

3315

for client in tcp_server.clients.itervalues():

2019

for client in tcp_server.clients:

3316

2020

if use_dbus:

3317

# Emit D-Bus signal for adding

3318

mandos_dbus_service.client_added_signal(client)

3319

# Need to initiate checking of clients

3320

if client.enabled:

3321

client.init_checker()

2021

# Emit D-Bus signal

2022

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2023

client.enable()

3322

2024

3323

2025

tcp_server.enable()

3324

2026

tcp_server.server_activate()

3325

2027

3326

2028

# Find out what port we got

3327

if zeroconf:

3328

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

2029

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

3329

2030

if use_ipv6:

3330

2031

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

3331

" flowinfo %d, scope_id %d",

3332

*tcp_server.socket.getsockname())

2032

" flowinfo %d, scope_id %d"

2033

% tcp_server.socket.getsockname())

3333

2034

else: # IPv4

3334

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

3335

*tcp_server.socket.getsockname())

2035

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

2036

% tcp_server.socket.getsockname())

3336

2037

3337

2038

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

3338

2039

3339

2040

try:

3340

if zeroconf:

3341

# From the Avahi example code

3342

try:

3343

service.activate()

3344

except dbus.exceptions.DBusException as error:

3345

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

3346

cleanup()

3347

sys.exit(1)

3348

# End of Avahi example code

2041

# From the Avahi example code

2042

try:

2043

service.activate()

2044

except dbus.exceptions.DBusException as error:

2045

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

2046

cleanup()

2047

sys.exit(1)

2048

# End of Avahi example code

3349

2049

3350

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

2050

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

3351

2051

lambda *args, **kwargs:

3352

2052

(tcp_server.handle_request

3353

2053

(*args[2:], **kwargs) or True))

3355

2055

logger.debug("Starting main loop")

3356

2056

main_loop.run()

3357

2057

except AvahiError as error:

3358

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

2058

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

3359

2059

cleanup()

3360

2060

sys.exit(1)

3361

2061

except KeyboardInterrupt:

3366

2066

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

3367

2067

cleanup()

3368

2068

3369

3370

2069

if __name__ == '__main__':

3371

2070

main()