/mandos/trunk : revision 837

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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@fukt.bsnet.se>.

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# Contact the authors at <mandos@recompile.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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import SocketServer as socketserver

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try:

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from future_builtins import *

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except ImportError:

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pass

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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 socket

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import argparse

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import datetime

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import errno

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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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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 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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import cPickle as pickle

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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 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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import gobject

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import avahi

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from gi.repository import GLib

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from dbus.mainloop.glib import DBusGMainLoop

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import ctypes

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import ctypes.util

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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.3.1"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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if sys.version_info.major == 2:

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str = unicode

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version = "1.7.6"

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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 copy_function(func):

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"""Make a copy of a function"""

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if sys.version_info.major == 2:

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return types.FunctionType(func.func_code,

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func.func_globals,

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func.func_name,

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func.func_defaults,

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func.func_closure)

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else:

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return types.FunctionType(func.__code__,

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func.__globals__,

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func.__name__,

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func.__defaults__,

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func.__closure__)

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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(b":")

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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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# Pretend that we have an Avahi module

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class Avahi(object):

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

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It is instantiated once, and simulates having an Avahi module."""

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IF_UNSPEC = -1 # avahi-common/address.h

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PROTO_UNSPEC = -1 # avahi-common/address.h

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PROTO_INET = 0 # avahi-common/address.h

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PROTO_INET6 = 1 # avahi-common/address.h

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DBUS_NAME = "org.freedesktop.Avahi"

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DBUS_INTERFACE_ENTRY_GROUP = DBUS_NAME + ".EntryGroup"

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DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"

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DBUS_PATH_SERVER = "/"

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def string_array_to_txt_array(self, t):

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return dbus.Array((dbus.ByteArray(s.encode("utf-8"))

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for s in t), signature="ay")

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ENTRY_GROUP_ESTABLISHED = 2 # avahi-common/defs.h

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ENTRY_GROUP_COLLISION = 3 # avahi-common/defs.h

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ENTRY_GROUP_FAILURE = 4 # avahi-common/defs.h

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SERVER_INVALID = 0 # avahi-common/defs.h

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SERVER_REGISTERING = 1 # avahi-common/defs.h

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SERVER_RUNNING = 2 # avahi-common/defs.h

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SERVER_COLLISION = 3 # avahi-common/defs.h

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SERVER_FAILURE = 4 # avahi-common/defs.h

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avahi = Avahi()

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

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**kwargs)

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

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

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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, 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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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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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):

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def rename(self, remove=True):

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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 = unicode(self.server.GetAlternativeServiceName(self.name))

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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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logger.info("Changing Zeroconf service name to %r ...",

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self.name)

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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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if remove:

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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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if (error.get_dbus_name()

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

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

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return self.rename(remove=False)

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else:

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

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self.cleanup()

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os._exit(1)

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def remove(self):

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

179

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

182

374

if self.group is not None:

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375

self.group.Reset()

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def add(self):

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

186

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self.remove()

191

384

avahi.DBUS_INTERFACE_ENTRY_GROUP)

192

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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))

195

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

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self.name, self.type)

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self.group.AddService(

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

205

398

self.group.Commit()

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def entry_group_state_changed(self, state, error):

207

401

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

208

402

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

214

408

self.rename()

215

409

elif state == avahi.ENTRY_GROUP_FAILURE:

216

410

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

217

unicode(error))

218

raise AvahiGroupError("State changed: %s"

219

% unicode(error))

411

str(error))

412

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

413

220

414

def cleanup(self):

221

415

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

222

416

if self.group is not None:

223

417

try:

224

418

self.group.Free()

225

419

except (dbus.exceptions.UnknownMethodException,

226

dbus.exceptions.DBusException) as e:

420

dbus.exceptions.DBusException):

227

421

pass

228

422

self.group = None

229

423

self.remove()

424

230

425

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

231

426

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

232

427

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

233

bad_states = { avahi.SERVER_INVALID:

234

"Zeroconf server invalid",

235

avahi.SERVER_REGISTERING: None,

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avahi.SERVER_COLLISION:

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"Zeroconf server name collision",

238

avahi.SERVER_FAILURE:

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"Zeroconf server failure" }

428

bad_states = {

429

avahi.SERVER_INVALID: "Zeroconf server invalid",

430

avahi.SERVER_REGISTERING: None,

431

avahi.SERVER_COLLISION: "Zeroconf server name collision",

432

avahi.SERVER_FAILURE: "Zeroconf server failure",

433

}

240

434

if state in bad_states:

241

435

if bad_states[state] is not None:

242

436

if error is None:

245

439

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

246

440

self.cleanup()

247

441

elif state == avahi.SERVER_RUNNING:

248

self.add()

442

try:

443

self.add()

444

except dbus.exceptions.DBusException as error:

445

if (error.get_dbus_name()

446

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

447

logger.info("Local Zeroconf service name"

448

" collision.")

449

return self.rename(remove=False)

450

else:

451

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

452

self.cleanup()

453

os._exit(1)

249

454

else:

250

455

if error is None:

251

456

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

252

457

else:

253

458

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

459

254

460

def activate(self):

255

461

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

256

462

if self.server is None:

260

466

follow_name_owner_changes=True),

261

467

avahi.DBUS_INTERFACE_SERVER)

262

468

self.server.connect_to_signal("StateChanged",

263

self.server_state_changed)

469

self.server_state_changed)

264

470

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

265

471

266

472

267

def _timedelta_to_milliseconds(td):

268

"Convert a datetime.timedelta() to milliseconds"

269

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

270

+ (td.seconds * 1000)

271

+ (td.microseconds // 1000))

272

473

class AvahiServiceToSyslog(AvahiService):

474

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

475

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

476

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

477

syslogger.setFormatter(logging.Formatter(

478

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

479

.format(self.name)))

480

return ret

481

482

# Pretend that we have a GnuTLS module

483

class GnuTLS(object):

484

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

485

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

486

487

_library = ctypes.cdll.LoadLibrary(

488

ctypes.util.find_library("gnutls"))

489

_need_version = b"3.3.0"

490

def __init__(self):

491

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

492

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

493

# happens.

494

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

495

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

496

.format(self._need_version))

497

498

# Unless otherwise indicated, the constants and types below are

499

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

500

501

# Constants

502

E_SUCCESS = 0

503

E_INTERRUPTED = -52

504

E_AGAIN = -28

505

CRT_OPENPGP = 2

506

CLIENT = 2

507

SHUT_RDWR = 0

508

CRD_CERTIFICATE = 1

509

E_NO_CERTIFICATE_FOUND = -49

510

OPENPGP_FMT_RAW = 0 # gnutls/openpgp.h

511

512

# Types

513

class session_int(ctypes.Structure):

514

_fields_ = []

515

session_t = ctypes.POINTER(session_int)

516

class certificate_credentials_st(ctypes.Structure):

517

_fields_ = []

518

certificate_credentials_t = ctypes.POINTER(

519

certificate_credentials_st)

520

certificate_type_t = ctypes.c_int

521

class datum_t(ctypes.Structure):

522

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

523

('size', ctypes.c_uint)]

524

class openpgp_crt_int(ctypes.Structure):

525

_fields_ = []

526

openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)

527

openpgp_crt_fmt_t = ctypes.c_int # gnutls/openpgp.h

528

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

529

credentials_type_t = ctypes.c_int

530

transport_ptr_t = ctypes.c_void_p

531

close_request_t = ctypes.c_int

532

533

# Exceptions

534

class Error(Exception):

535

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

536

# exception might be raised from within GnuTLS.__init__,

537

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

538

# global variable has happened.

539

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

540

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

541

# code is passed, convert it to a string with

542

# gnutls.strerror()

543

self.code = code

544

if message is None and code is not None:

545

message = GnuTLS.strerror(code)

546

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

547

message, *args)

548

549

class CertificateSecurityError(Error):

550

pass

551

552

# Classes

553

class Credentials(object):

554

def __init__(self):

555

self._c_object = gnutls.certificate_credentials_t()

556

gnutls.certificate_allocate_credentials(

557

ctypes.byref(self._c_object))

558

self.type = gnutls.CRD_CERTIFICATE

559

560

def __del__(self):

561

gnutls.certificate_free_credentials(self._c_object)

562

563

class ClientSession(object):

564

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

565

self._c_object = gnutls.session_t()

566

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

567

gnutls.set_default_priority(self._c_object)

568

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

569

gnutls.handshake_set_private_extensions(self._c_object,

570

True)

571

self.socket = socket

572

if credentials is None:

573

credentials = gnutls.Credentials()

574

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

575

ctypes.cast(credentials._c_object,

576

ctypes.c_void_p))

577

self.credentials = credentials

578

579

def __del__(self):

580

gnutls.deinit(self._c_object)

581

582

def handshake(self):

583

return gnutls.handshake(self._c_object)

584

585

def send(self, data):

586

data = bytes(data)

587

data_len = len(data)

588

while data_len > 0:

589

data_len -= gnutls.record_send(self._c_object,

590

data[-data_len:],

591

data_len)

592

593

def bye(self):

594

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

595

596

# Error handling functions

597

def _error_code(result):

598

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

599

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

600

if result >= 0:

601

return result

602

if result == gnutls.E_NO_CERTIFICATE_FOUND:

603

raise gnutls.CertificateSecurityError(code = result)

604

raise gnutls.Error(code = result)

605

606

def _retry_on_error(result, func, arguments):

607

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

608

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

609

while result < 0:

610

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

611

return _error_code(result)

612

result = func(*arguments)

613

return result

614

615

# Unless otherwise indicated, the function declarations below are

616

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

617

618

# Functions

619

priority_set_direct = _library.gnutls_priority_set_direct

620

priority_set_direct.argtypes = [session_t, ctypes.c_char_p,

621

ctypes.POINTER(ctypes.c_char_p)]

622

priority_set_direct.restype = _error_code

623

624

init = _library.gnutls_init

625

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

626

init.restype = _error_code

627

628

set_default_priority = _library.gnutls_set_default_priority

629

set_default_priority.argtypes = [session_t]

630

set_default_priority.restype = _error_code

631

632

record_send = _library.gnutls_record_send

633

record_send.argtypes = [session_t, ctypes.c_void_p,

634

ctypes.c_size_t]

635

record_send.restype = ctypes.c_ssize_t

636

record_send.errcheck = _retry_on_error

637

638

certificate_allocate_credentials = (

639

_library.gnutls_certificate_allocate_credentials)

640

certificate_allocate_credentials.argtypes = [

641

ctypes.POINTER(certificate_credentials_t)]

642

certificate_allocate_credentials.restype = _error_code

643

644

certificate_free_credentials = (

645

_library.gnutls_certificate_free_credentials)

646

certificate_free_credentials.argtypes = [certificate_credentials_t]

647

certificate_free_credentials.restype = None

648

649

handshake_set_private_extensions = (

650

_library.gnutls_handshake_set_private_extensions)

651

handshake_set_private_extensions.argtypes = [session_t,

652

ctypes.c_int]

653

handshake_set_private_extensions.restype = None

654

655

credentials_set = _library.gnutls_credentials_set

656

credentials_set.argtypes = [session_t, credentials_type_t,

657

ctypes.c_void_p]

658

credentials_set.restype = _error_code

659

660

strerror = _library.gnutls_strerror

661

strerror.argtypes = [ctypes.c_int]

662

strerror.restype = ctypes.c_char_p

663

664

certificate_type_get = _library.gnutls_certificate_type_get

665

certificate_type_get.argtypes = [session_t]

666

certificate_type_get.restype = _error_code

667

668

certificate_get_peers = _library.gnutls_certificate_get_peers

669

certificate_get_peers.argtypes = [session_t,

670

ctypes.POINTER(ctypes.c_uint)]

671

certificate_get_peers.restype = ctypes.POINTER(datum_t)

672

673

global_set_log_level = _library.gnutls_global_set_log_level

674

global_set_log_level.argtypes = [ctypes.c_int]

675

global_set_log_level.restype = None

676

677

global_set_log_function = _library.gnutls_global_set_log_function

678

global_set_log_function.argtypes = [log_func]

679

global_set_log_function.restype = None

680

681

deinit = _library.gnutls_deinit

682

deinit.argtypes = [session_t]

683

deinit.restype = None

684

685

handshake = _library.gnutls_handshake

686

handshake.argtypes = [session_t]

687

handshake.restype = _error_code

688

handshake.errcheck = _retry_on_error

689

690

transport_set_ptr = _library.gnutls_transport_set_ptr

691

transport_set_ptr.argtypes = [session_t, transport_ptr_t]

692

transport_set_ptr.restype = None

693

694

bye = _library.gnutls_bye

695

bye.argtypes = [session_t, close_request_t]

696

bye.restype = _error_code

697

bye.errcheck = _retry_on_error

698

699

check_version = _library.gnutls_check_version

700

check_version.argtypes = [ctypes.c_char_p]

701

check_version.restype = ctypes.c_char_p

702

703

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

704

705

openpgp_crt_init = _library.gnutls_openpgp_crt_init

706

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

707

openpgp_crt_init.restype = _error_code

708

709

openpgp_crt_import = _library.gnutls_openpgp_crt_import

710

openpgp_crt_import.argtypes = [openpgp_crt_t,

711

ctypes.POINTER(datum_t),

712

openpgp_crt_fmt_t]

713

openpgp_crt_import.restype = _error_code

714

715

openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self

716

openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,

717

ctypes.POINTER(ctypes.c_uint)]

718

openpgp_crt_verify_self.restype = _error_code

719

720

openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit

721

openpgp_crt_deinit.argtypes = [openpgp_crt_t]

722

openpgp_crt_deinit.restype = None

723

724

openpgp_crt_get_fingerprint = (

725

_library.gnutls_openpgp_crt_get_fingerprint)

726

openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,

727

ctypes.c_void_p,

728

ctypes.POINTER(

729

ctypes.c_size_t)]

730

openpgp_crt_get_fingerprint.restype = _error_code

731

732

# Remove non-public functions

733

del _error_code, _retry_on_error

734

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

735

gnutls = GnuTLS()

736

737

def call_pipe(connection, # : multiprocessing.Connection

738

func, *args, **kwargs):

739

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

740

741

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

742

return value on the provided multiprocessing.Connection.

743

"""

744

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

745

connection.close()

746

273

747

class Client(object):

274

748

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

275

749

276

750

Attributes:

277

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

751

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

278

752

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

279

753

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

280

754

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

281

755

to see if the client lives.

282

756

'None' if no process is running.

283

checker_callback_tag: a gobject event source tag, or None

757

checker_callback_tag: a GLib event source tag, or None

284

758

checker_command: string; External command which is run to check

285

759

if client lives. %() expansions are done at

286

760

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

287

761

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

288

checker_initiator_tag: a gobject event source tag, or None

762

checker_initiator_tag: a GLib event source tag, or None

289

763

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

764

client_structure: Object describing what attributes a client has

765

and is used for storing the client at exit

290

766

current_checker_command: string; current running checker_command

291

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

292

disable_initiator_tag: a gobject event source tag, or None

767

disable_initiator_tag: a GLib event source tag, or None

293

768

enabled: bool()

294

769

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

295

770

uniquely identify the client

297

772

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

298

773

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

299

774

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

300

last_enabled: datetime.datetime(); (UTC)

775

last_checker_status: integer between 0 and 255 reflecting exit

776

status of last checker. -1 reflects crashed

777

checker, -2 means no checker completed yet.

778

last_checker_signal: The signal which killed the last checker, if

779

last_checker_status is -1

780

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

301

781

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

302

782

D-Bus identifiers

303

783

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

304

784

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

305

785

until this client is disabled

306

extended_timeout: extra long timeout when password has been sent

786

extended_timeout: extra long timeout when secret has been sent

307

787

runtime_expansions: Allowed attributes for runtime expansion.

308

788

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

309

789

disabled, or None

790

server_settings: The server_settings dict from main()

310

791

"""

311

792

312

793

runtime_expansions = ("approval_delay", "approval_duration",

313

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

314

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

794

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

795

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

796

"last_approval_request", "last_checked_ok",

315

797

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

316

317

def timeout_milliseconds(self):

318

"Return the 'timeout' attribute in milliseconds"

319

return _timedelta_to_milliseconds(self.timeout)

320

321

def extended_timeout_milliseconds(self):

322

"Return the 'extended_timeout' attribute in milliseconds"

323

return _timedelta_to_milliseconds(self.extended_timeout)

324

325

def interval_milliseconds(self):

326

"Return the 'interval' attribute in milliseconds"

327

return _timedelta_to_milliseconds(self.interval)

328

329

def approval_delay_milliseconds(self):

330

return _timedelta_to_milliseconds(self.approval_delay)

331

332

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

333

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

334

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

335

attribute."""

798

client_defaults = {

799

"timeout": "PT5M",

800

"extended_timeout": "PT15M",

801

"interval": "PT2M",

802

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

803

"host": "",

804

"approval_delay": "PT0S",

805

"approval_duration": "PT1S",

806

"approved_by_default": "True",

807

"enabled": "True",

808

}

809

810

@staticmethod

811

def config_parser(config):

812

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

813

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

814

with exceptions for any special settings as defined above.

815

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

816

value given the same arguments.

817

"""

818

settings = {}

819

for client_name in config.sections():

820

section = dict(config.items(client_name))

821

client = settings[client_name] = {}

822

823

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

824

# Reformat values from string types to Python types

825

client["approved_by_default"] = config.getboolean(

826

client_name, "approved_by_default")

827

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

828

"enabled")

829

830

# Uppercase and remove spaces from fingerprint for later

831

# comparison purposes with return value from the

832

# fingerprint() function

833

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

834

.replace(" ", ""))

835

if "secret" in section:

836

client["secret"] = codecs.decode(section["secret"]

837

.encode("utf-8"),

838

"base64")

839

elif "secfile" in section:

840

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

841

(section["secfile"])),

842

"rb") as secfile:

843

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

844

else:

845

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

846

.format(section))

847

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

848

client["extended_timeout"] = string_to_delta(

849

section["extended_timeout"])

850

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

851

client["approval_delay"] = string_to_delta(

852

section["approval_delay"])

853

client["approval_duration"] = string_to_delta(

854

section["approval_duration"])

855

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

856

client["last_approval_request"] = None

857

client["last_checked_ok"] = None

858

client["last_checker_status"] = -2

859

860

return settings

861

862

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

336

863

self.name = name

337

if config is None:

338

config = {}

864

if server_settings is None:

865

server_settings = {}

866

self.server_settings = server_settings

867

# adding all client settings

868

for setting, value in settings.items():

869

setattr(self, setting, value)

870

871

if self.enabled:

872

if not hasattr(self, "last_enabled"):

873

self.last_enabled = datetime.datetime.utcnow()

874

if not hasattr(self, "expires"):

875

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

876

+ self.timeout)

877

else:

878

self.last_enabled = None

879

self.expires = None

880

339

881

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

340

# Uppercase and remove spaces from fingerprint for later

341

# comparison purposes with return value from the fingerprint()

342

# function

343

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

344

.replace(" ", ""))

345

882

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

346

if "secret" in config:

347

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

348

elif "secfile" in config:

349

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

350

(config["secfile"])),

351

"rb") as secfile:

352

self.secret = secfile.read()

353

else:

354

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

355

% self.name)

356

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

357

self.created = datetime.datetime.utcnow()

358

self.enabled = False

359

self.last_approval_request = None

360

self.last_enabled = None

361

self.last_checked_ok = None

362

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

363

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

364

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

365

self.disable_hook = disable_hook

883

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

884

datetime.datetime.utcnow())

885

886

# attributes specific for this server instance

366

887

self.checker = None

367

888

self.checker_initiator_tag = None

368

889

self.disable_initiator_tag = None

369

self.expires = None

370

890

self.checker_callback_tag = None

371

self.checker_command = config["checker"]

372

891

self.current_checker_command = None

373

self.last_connect = None

374

self._approved = None

375

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

376

True)

892

self.approved = None

377

893

self.approvals_pending = 0

378

self.approval_delay = string_to_delta(

379

config["approval_delay"])

380

self.approval_duration = string_to_delta(

381

config["approval_duration"])

382

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

894

self.changedstate = multiprocessing_manager.Condition(

895

multiprocessing_manager.Lock())

896

self.client_structure = [attr

897

for attr in self.__dict__.keys()

898

if not attr.startswith("_")]

899

self.client_structure.append("client_structure")

900

901

for name, t in inspect.getmembers(

902

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

903

if not name.startswith("_"):

904

self.client_structure.append(name)

383

905

906

# Send notice to process children that client state has changed

384

907

def send_changedstate(self):

385

self.changedstate.acquire()

386

self.changedstate.notify_all()

387

self.changedstate.release()

388

908

with self.changedstate:

909

self.changedstate.notify_all()

910

389

911

def enable(self):

390

912

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

391

913

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

392

914

# Already enabled

393

915

return

394

self.send_changedstate()

395

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

396

# and every interval from then on.

397

self.checker_initiator_tag = (gobject.timeout_add

398

(self.interval_milliseconds(),

399

self.start_checker))

400

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

401

916

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

402

self.disable_initiator_tag = (gobject.timeout_add

403

(self.timeout_milliseconds(),

404

self.disable))

405

917

self.enabled = True

406

918

self.last_enabled = datetime.datetime.utcnow()

407

# Also start a new checker *right now*.

408

self.start_checker()

919

self.init_checker()

920

self.send_changedstate()

409

921

410

922

def disable(self, quiet=True):

411

923

"""Disable this client."""

412

924

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

413

925

return False

414

926

if not quiet:

415

self.send_changedstate()

416

if not quiet:

417

927

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

418

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

419

gobject.source_remove(self.disable_initiator_tag)

928

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

929

GLib.source_remove(self.disable_initiator_tag)

420

930

self.disable_initiator_tag = None

421

931

self.expires = None

422

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

423

gobject.source_remove(self.checker_initiator_tag)

932

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

933

GLib.source_remove(self.checker_initiator_tag)

424

934

self.checker_initiator_tag = None

425

935

self.stop_checker()

426

if self.disable_hook:

427

self.disable_hook(self)

428

936

self.enabled = False

429

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

937

if not quiet:

938

self.send_changedstate()

939

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

430

940

return False

431

941

432

942

def __del__(self):

433

self.disable_hook = None

434

943

self.disable()

435

944

436

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

945

def init_checker(self):

946

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

947

# and every interval from then on.

948

if self.checker_initiator_tag is not None:

949

GLib.source_remove(self.checker_initiator_tag)

950

self.checker_initiator_tag = GLib.timeout_add(

951

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

952

self.start_checker)

953

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

954

if self.disable_initiator_tag is not None:

955

GLib.source_remove(self.disable_initiator_tag)

956

self.disable_initiator_tag = GLib.timeout_add(

957

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

958

# Also start a new checker *right now*.

959

self.start_checker()

960

961

def checker_callback(self, source, condition, connection,

962

command):

437

963

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

438

964

self.checker_callback_tag = None

439

965

self.checker = None

440

if os.WIFEXITED(condition):

441

exitstatus = os.WEXITSTATUS(condition)

442

if exitstatus == 0:

966

# Read return code from connection (see call_pipe)

967

returncode = connection.recv()

968

connection.close()

969

970

if returncode >= 0:

971

self.last_checker_status = returncode

972

self.last_checker_signal = None

973

if self.last_checker_status == 0:

443

974

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

444

975

vars(self))

445

976

self.checked_ok()

446

977

else:

447

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

448

vars(self))

978

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

449

979

else:

980

self.last_checker_status = -1

981

self.last_checker_signal = -returncode

450

982

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

451

983

vars(self))

452

453

def checked_ok(self, timeout=None):

454

"""Bump up the timeout for this client.

455

456

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

457

alive and well.

458

"""

984

return False

985

986

def checked_ok(self):

987

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

988

self.last_checked_ok = datetime.datetime.utcnow()

989

self.last_checker_status = 0

990

self.last_checker_signal = None

991

self.bump_timeout()

992

993

def bump_timeout(self, timeout=None):

994

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

459

995

if timeout is None:

460

996

timeout = self.timeout

461

self.last_checked_ok = datetime.datetime.utcnow()

462

gobject.source_remove(self.disable_initiator_tag)

463

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

464

self.disable_initiator_tag = (gobject.timeout_add

465

(_timedelta_to_milliseconds(timeout),

466

self.disable))

997

if self.disable_initiator_tag is not None:

998

GLib.source_remove(self.disable_initiator_tag)

999

self.disable_initiator_tag = None

1000

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

1001

self.disable_initiator_tag = GLib.timeout_add(

1002

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

1003

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

467

1004

468

1005

def need_approval(self):

469

1006

self.last_approval_request = datetime.datetime.utcnow()

474

1011

If a checker already exists, leave it running and do

475

1012

nothing."""

476

1013

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

477

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

478

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

479

# client would inevitably timeout, since no checker would get

480

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

1014

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

1015

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

1016

# would inevitably timeout, since no checker would get a

1017

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

481

1018

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

482

1019

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

483

1020

# should be.

484

1021

485

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

486

try:

487

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

488

except (AttributeError, OSError) as error:

489

if (isinstance(error, OSError)

490

and error.errno != errno.ECHILD):

491

raise error

492

else:

493

if pid:

494

logger.warning("Checker was a zombie")

495

gobject.source_remove(self.checker_callback_tag)

496

self.checker_callback(pid, status,

497

self.current_checker_command)

1022

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

1023

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

1024

self.checker.join()

1025

self.checker = None

498

1026

# Start a new checker if needed

499

1027

if self.checker is None:

1028

# Escape attributes for the shell

1029

escaped_attrs = {

1030

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

1031

for attr in self.runtime_expansions }

500

1032

try:

501

# In case checker_command has exactly one % operator

502

command = self.checker_command % self.host

503

except TypeError:

504

# Escape attributes for the shell

505

escaped_attrs = dict(

506

(attr,

507

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

508

errors=

509

'replace')))

510

for attr in

511

self.runtime_expansions)

512

513

try:

514

command = self.checker_command % escaped_attrs

515

except TypeError as error:

516

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

517

' %s', self.checker_command, error)

518

return True # Try again later

1033

command = self.checker_command % escaped_attrs

1034

except TypeError as error:

1035

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

1036

self.checker_command,

1037

exc_info=error)

1038

return True # Try again later

519

1039

self.current_checker_command = command

520

try:

521

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

522

command, self.name)

523

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

524

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

525

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

526

# always replaced by /dev/null.)

527

self.checker = subprocess.Popen(command,

528

close_fds=True,

529

shell=True, cwd="/")

530

self.checker_callback_tag = (gobject.child_watch_add

531

(self.checker.pid,

532

self.checker_callback,

533

data=command))

534

# The checker may have completed before the gobject

535

# watch was added. Check for this.

536

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

537

if pid:

538

gobject.source_remove(self.checker_callback_tag)

539

self.checker_callback(pid, status, command)

540

except OSError as error:

541

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

542

error)

543

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

1040

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

1041

self.name)

1042

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

1043

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

1044

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

1045

# always replaced by /dev/null.)

1046

# The exception is when not debugging but nevertheless

1047

# running in the foreground; use the previously

1048

# created wnull.

1049

popen_args = { "close_fds": True,

1050

"shell": True,

1051

"cwd": "/" }

1052

if (not self.server_settings["debug"]

1053

and self.server_settings["foreground"]):

1054

popen_args.update({"stdout": wnull,

1055

"stderr": wnull })

1056

pipe = multiprocessing.Pipe(duplex = False)

1057

self.checker = multiprocessing.Process(

1058

target = call_pipe,

1059

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

1060

kwargs = popen_args)

1061

self.checker.start()

1062

self.checker_callback_tag = GLib.io_add_watch(

1063

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

1064

self.checker_callback, pipe[0], command)

1065

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

544

1066

return True

545

1067

546

1068

def stop_checker(self):

547

1069

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

548

1070

if self.checker_callback_tag:

549

gobject.source_remove(self.checker_callback_tag)

1071

GLib.source_remove(self.checker_callback_tag)

550

1072

self.checker_callback_tag = None

551

1073

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

552

1074

return

553

1075

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

554

try:

555

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

556

#time.sleep(0.5)

557

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

558

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

559

except OSError as error:

560

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

561

raise

1076

self.checker.terminate()

562

1077

self.checker = None

563

1078

564

1079

565

def dbus_service_property(dbus_interface, signature="v",

566

access="readwrite", byte_arrays=False):

1080

def dbus_service_property(dbus_interface,

1081

signature="v",

1082

access="readwrite",

1083

byte_arrays=False):

567

1084

"""Decorators for marking methods of a DBusObjectWithProperties to

568

1085

become properties on the D-Bus.

569

1086

578

1095

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

579

1096

if byte_arrays and signature != "ay":

580

1097

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

581

" signature %r" % signature)

1098

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

1099

582

1100

def decorator(func):

583

1101

func._dbus_is_property = True

584

1102

func._dbus_interface = dbus_interface

589

1107

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

590

1108

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

591

1109

return func

1110

1111

return decorator

1112

1113

1114

def dbus_interface_annotations(dbus_interface):

1115

"""Decorator for marking functions returning interface annotations

1116

1117

Usage:

1118

1119

@dbus_interface_annotations("org.example.Interface")

1120

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

1121

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

1122

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

1123

"false"}

1124

"""

1125

1126

def decorator(func):

1127

func._dbus_is_interface = True

1128

func._dbus_interface = dbus_interface

1129

func._dbus_name = dbus_interface

1130

return func

1131

1132

return decorator

1133

1134

1135

def dbus_annotations(annotations):

1136

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

1137

Usage:

1138

1139

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

1140

"org.freedesktop.DBus.Property."

1141

"EmitsChangedSignal": "false"})

1142

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

1143

access="r")

1144

def Property_dbus_property(self):

1145

return dbus.Boolean(False)

1146

1147

See also the DBusObjectWithAnnotations class.

1148

"""

1149

1150

def decorator(func):

1151

func._dbus_annotations = annotations

1152

return func

1153

592

1154

return decorator

593

1155

594

1156

595

1157

class DBusPropertyException(dbus.exceptions.DBusException):

596

1158

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

597

1159

"""

598

def __unicode__(self):

599

return unicode(str(self))

1160

pass

600

1161

601

1162

602

1163

class DBusPropertyAccessException(DBusPropertyException):

611

1172

pass

612

1173

613

1174

614

class DBusObjectWithProperties(dbus.service.Object):

1175

class DBusObjectWithAnnotations(dbus.service.Object):

1176

"""A D-Bus object with annotations.

1177

1178

Classes inheriting from this can use the dbus_annotations

1179

decorator to add annotations to methods or signals.

1180

"""

1181

1182

@staticmethod

1183

def _is_dbus_thing(thing):

1184

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

1185

1186

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

1187

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

1188

"""

1189

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

1190

False)

1191

1192

def _get_all_dbus_things(self, thing):

1193

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

1194

"""

1195

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

1196

athing.__get__(self))

1197

for cls in self.__class__.__mro__

1198

for name, athing in

1199

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

1200

1201

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1202

out_signature = "s",

1203

path_keyword = 'object_path',

1204

connection_keyword = 'connection')

1205

def Introspect(self, object_path, connection):

1206

"""Overloading of standard D-Bus method.

1207

1208

Inserts annotation tags on methods and signals.

1209

"""

1210

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

1211

connection)

1212

try:

1213

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

1214

1215

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

1216

# Add annotation tags

1217

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

1218

for tag in if_tag.getElementsByTagName(typ):

1219

annots = dict()

1220

for name, prop in (self.

1221

_get_all_dbus_things(typ)):

1222

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

1223

and prop._dbus_interface

1224

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

1225

annots.update(getattr(

1226

prop, "_dbus_annotations", {}))

1227

for name, value in annots.items():

1228

ann_tag = document.createElement(

1229

"annotation")

1230

ann_tag.setAttribute("name", name)

1231

ann_tag.setAttribute("value", value)

1232

tag.appendChild(ann_tag)

1233

# Add interface annotation tags

1234

for annotation, value in dict(

1235

itertools.chain.from_iterable(

1236

annotations().items()

1237

for name, annotations

1238

in self._get_all_dbus_things("interface")

1239

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

1240

)).items():

1241

ann_tag = document.createElement("annotation")

1242

ann_tag.setAttribute("name", annotation)

1243

ann_tag.setAttribute("value", value)

1244

if_tag.appendChild(ann_tag)

1245

# Fix argument name for the Introspect method itself

1246

if (if_tag.getAttribute("name")

1247

== dbus.INTROSPECTABLE_IFACE):

1248

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

1249

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

1250

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

1251

if (arg.getAttribute("direction")

1252

== "out"):

1253

arg.setAttribute("name",

1254

"xml_data")

1255

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

1256

document.unlink()

1257

except (AttributeError, xml.dom.DOMException,

1258

xml.parsers.expat.ExpatError) as error:

1259

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

1260

exc_info=error)

1261

return xmlstring

1262

1263

1264

class DBusObjectWithProperties(DBusObjectWithAnnotations):

615

1265

"""A D-Bus object with properties.

616

1266

617

1267

Classes inheriting from this can use the dbus_service_property

619

1269

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

620

1270

"""

621

1271

622

@staticmethod

623

def _is_dbus_property(obj):

624

return getattr(obj, "_dbus_is_property", False)

625

626

def _get_all_dbus_properties(self):

627

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

628

"""

629

return ((prop._dbus_name, prop)

630

for name, prop in

631

inspect.getmembers(self, self._is_dbus_property))

632

633

1272

def _get_dbus_property(self, interface_name, property_name):

634

1273

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

635

1274

property with the specified name and interface.

636

1275

"""

637

for name in (property_name,

638

property_name + "_dbus_property"):

639

prop = getattr(self, name, None)

640

if (prop is None

641

or not self._is_dbus_property(prop)

642

or prop._dbus_name != property_name

643

or (interface_name and prop._dbus_interface

644

and interface_name != prop._dbus_interface)):

645

continue

646

return prop

1276

for cls in self.__class__.__mro__:

1277

for name, value in inspect.getmembers(

1278

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

1279

if (value._dbus_name == property_name

1280

and value._dbus_interface == interface_name):

1281

return value.__get__(self)

1282

647

1283

# No such property

648

raise DBusPropertyNotFound(self.dbus_object_path + ":"

649

+ interface_name + "."

650

+ property_name)

651

652

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

1284

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

1285

self.dbus_object_path, interface_name, property_name))

1286

1287

@classmethod

1288

def _get_all_interface_names(cls):

1289

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

1290

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

1291

"_dbus_interface", None)

1292

for x in (inspect.getmro(cls))

1293

for attr in dir(x))

1294

if name is not None)

1295

1296

@dbus.service.method(dbus.PROPERTIES_IFACE,

1297

in_signature="ss",

653

1298

out_signature="v")

654

1299

def Get(self, interface_name, property_name):

655

1300

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

673

1318

# The byte_arrays option is not supported yet on

674

1319

# signatures other than "ay".

675

1320

if prop._dbus_signature != "ay":

676

raise ValueError

677

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

678

for byte in value))

1321

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

1322

"'ay' signature {!r}"

1323

.format(prop._dbus_signature))

1324

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

1325

for byte in value))

679

1326

prop(value)

680

1327

681

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

1328

@dbus.service.method(dbus.PROPERTIES_IFACE,

1329

in_signature="s",

682

1330

out_signature="a{sv}")

683

1331

def GetAll(self, interface_name):

684

1332

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

686

1334

687

1335

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

688

1336

"""

689

all = {}

690

for name, prop in self._get_all_dbus_properties():

1337

properties = {}

1338

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

691

1339

if (interface_name

692

1340

and interface_name != prop._dbus_interface):

693

1341

# Interface non-empty but did not match

697

1345

continue

698

1346

value = prop()

699

1347

if not hasattr(value, "variant_level"):

700

all[name] = value

1348

properties[name] = value

701

1349

continue

702

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

703

value.variant_level+1)

704

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

1350

properties[name] = type(value)(

1351

value, variant_level = value.variant_level + 1)

1352

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

1353

1354

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

1355

def PropertiesChanged(self, interface_name, changed_properties,

1356

invalidated_properties):

1357

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

1358

standard.

1359

"""

1360

pass

705

1361

706

1362

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

707

1363

out_signature="s",

708

1364

path_keyword='object_path',

709

1365

connection_keyword='connection')

710

1366

def Introspect(self, object_path, connection):

711

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

1367

"""Overloading of standard D-Bus method.

1368

1369

Inserts property tags and interface annotation tags.

712

1370

"""

713

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

714

connection)

1371

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1372

object_path,

1373

connection)

715

1374

try:

716

1375

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

1376

717

1377

def make_tag(document, name, prop):

718

1378

e = document.createElement("property")

719

1379

e.setAttribute("name", name)

720

1380

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

721

1381

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

722

1382

return e

1383

723

1384

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

1385

# Add property tags

724

1386

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

725

1387

for name, prop

726

in self._get_all_dbus_properties()

1388

in self._get_all_dbus_things("property")

727

1389

if prop._dbus_interface

728

1390

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

729

1391

if_tag.appendChild(tag)

1392

# Add annotation tags for properties

1393

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

1394

annots = dict()

1395

for name, prop in self._get_all_dbus_things(

1396

"property"):

1397

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

1398

and prop._dbus_interface

1399

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

1400

annots.update(getattr(

1401

prop, "_dbus_annotations", {}))

1402

for name, value in annots.items():

1403

ann_tag = document.createElement(

1404

"annotation")

1405

ann_tag.setAttribute("name", name)

1406

ann_tag.setAttribute("value", value)

1407

tag.appendChild(ann_tag)

730

1408

# Add the names to the return values for the

731

1409

# "org.freedesktop.DBus.Properties" methods

732

1410

if (if_tag.getAttribute("name")

747

1425

except (AttributeError, xml.dom.DOMException,

748

1426

xml.parsers.expat.ExpatError) as error:

749

1427

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

750

error)

751

return xmlstring

752

753

754

def datetime_to_dbus (dt, variant_level=0):

1428

exc_info=error)

1429

return xmlstring

1430

1431

try:

1432

dbus.OBJECT_MANAGER_IFACE

1433

except AttributeError:

1434

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

1435

1436

class DBusObjectWithObjectManager(DBusObjectWithAnnotations):

1437

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

1438

1439

Classes inheriting from this exposes the standard

1440

GetManagedObjects call and the InterfacesAdded and

1441

InterfacesRemoved signals on the standard

1442

"org.freedesktop.DBus.ObjectManager" interface.

1443

1444

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

1445

manually.

1446

"""

1447

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

1448

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

1449

def GetManagedObjects(self):

1450

"""This function must be overridden"""

1451

raise NotImplementedError()

1452

1453

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,

1454

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

1455

def InterfacesAdded(self, object_path, interfaces_and_properties):

1456

pass

1457

1458

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

1459

def InterfacesRemoved(self, object_path, interfaces):

1460

pass

1461

1462

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1463

out_signature = "s",

1464

path_keyword = 'object_path',

1465

connection_keyword = 'connection')

1466

def Introspect(self, object_path, connection):

1467

"""Overloading of standard D-Bus method.

1468

1469

Override return argument name of GetManagedObjects to be

1470

"objpath_interfaces_and_properties"

1471

"""

1472

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1473

object_path,

1474

connection)

1475

try:

1476

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

1477

1478

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

1479

# Fix argument name for the GetManagedObjects method

1480

if (if_tag.getAttribute("name")

1481

== dbus.OBJECT_MANAGER_IFACE):

1482

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

1483

if (cn.getAttribute("name")

1484

== "GetManagedObjects"):

1485

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

1486

if (arg.getAttribute("direction")

1487

== "out"):

1488

arg.setAttribute(

1489

"name",

1490

"objpath_interfaces"

1491

"_and_properties")

1492

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

1493

document.unlink()

1494

except (AttributeError, xml.dom.DOMException,

1495

xml.parsers.expat.ExpatError) as error:

1496

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

1497

exc_info = error)

1498

return xmlstring

1499

1500

def datetime_to_dbus(dt, variant_level=0):

755

1501

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

756

1502

if dt is None:

757

1503

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

758

return dbus.String(dt.isoformat(),

759

variant_level=variant_level)

760

761

1504

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

1505

1506

1507

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1508

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

1509

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

1510

interface names according to the "alt_interface_names" mapping.

1511

Usage:

1512

1513

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

1514

"net.example.AlternateInterface"})

1515

class SampleDBusObject(dbus.service.Object):

1516

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

1517

def SampleDBusMethod():

1518

pass

1519

1520

The above "SampleDBusMethod" on "SampleDBusObject" will be

1521

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

1522

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

1523

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

1524

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

1525

1526

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

1527

(from DBusObjectWithProperties) and interfaces (from the

1528

dbus_interface_annotations decorator).

1529

"""

1530

1531

def wrapper(cls):

1532

for orig_interface_name, alt_interface_name in (

1533

alt_interface_names.items()):

1534

attr = {}

1535

interface_names = set()

1536

# Go though all attributes of the class

1537

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

1538

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

1539

# with the wrong interface name

1540

if (not hasattr(attribute, "_dbus_interface")

1541

or not attribute._dbus_interface.startswith(

1542

orig_interface_name)):

1543

continue

1544

# Create an alternate D-Bus interface name based on

1545

# the current name

1546

alt_interface = attribute._dbus_interface.replace(

1547

orig_interface_name, alt_interface_name)

1548

interface_names.add(alt_interface)

1549

# Is this a D-Bus signal?

1550

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

1551

# Extract the original non-method undecorated

1552

# function by black magic

1553

if sys.version_info.major == 2:

1554

nonmethod_func = (dict(

1555

zip(attribute.func_code.co_freevars,

1556

attribute.__closure__))

1557

["func"].cell_contents)

1558

else:

1559

nonmethod_func = (dict(

1560

zip(attribute.__code__.co_freevars,

1561

attribute.__closure__))

1562

["func"].cell_contents)

1563

# Create a new, but exactly alike, function

1564

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

1565

# with the alternate D-Bus interface name

1566

new_function = copy_function(nonmethod_func)

1567

new_function = (dbus.service.signal(

1568

alt_interface,

1569

attribute._dbus_signature)(new_function))

1570

# Copy annotations, if any

1571

try:

1572

new_function._dbus_annotations = dict(

1573

attribute._dbus_annotations)

1574

except AttributeError:

1575

pass

1576

# Define a creator of a function to call both the

1577

# original and alternate functions, so both the

1578

# original and alternate signals gets sent when

1579

# the function is called

1580

def fixscope(func1, func2):

1581

"""This function is a scope container to pass

1582

func1 and func2 to the "call_both" function

1583

outside of its arguments"""

1584

1585

@functools.wraps(func2)

1586

def call_both(*args, **kwargs):

1587

"""This function will emit two D-Bus

1588

signals by calling func1 and func2"""

1589

func1(*args, **kwargs)

1590

func2(*args, **kwargs)

1591

# Make wrapper function look like a D-Bus signal

1592

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

1593

if name.startswith("_dbus_"):

1594

setattr(call_both, name, attr)

1595

1596

return call_both

1597

# Create the "call_both" function and add it to

1598

# the class

1599

attr[attrname] = fixscope(attribute, new_function)

1600

# Is this a D-Bus method?

1601

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

1602

# Create a new, but exactly alike, function

1603

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

1604

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

1605

# to the class.

1606

attr[attrname] = (

1607

dbus.service.method(

1608

alt_interface,

1609

attribute._dbus_in_signature,

1610

attribute._dbus_out_signature)

1611

(copy_function(attribute)))

1612

# Copy annotations, if any

1613

try:

1614

attr[attrname]._dbus_annotations = dict(

1615

attribute._dbus_annotations)

1616

except AttributeError:

1617

pass

1618

# Is this a D-Bus property?

1619

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

1620

# Create a new, but exactly alike, function

1621

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

1622

# property with the alternate D-Bus interface

1623

# name. Add it to the class.

1624

attr[attrname] = (dbus_service_property(

1625

alt_interface, attribute._dbus_signature,

1626

attribute._dbus_access,

1627

attribute._dbus_get_args_options

1628

["byte_arrays"])

1629

(copy_function(attribute)))

1630

# Copy annotations, if any

1631

try:

1632

attr[attrname]._dbus_annotations = dict(

1633

attribute._dbus_annotations)

1634

except AttributeError:

1635

pass

1636

# Is this a D-Bus interface?

1637

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

1638

# Create a new, but exactly alike, function

1639

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

1640

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

1641

# to the class.

1642

attr[attrname] = (

1643

dbus_interface_annotations(alt_interface)

1644

(copy_function(attribute)))

1645

if deprecate:

1646

# Deprecate all alternate interfaces

1647

iname="_AlternateDBusNames_interface_annotation{}"

1648

for interface_name in interface_names:

1649

1650

@dbus_interface_annotations(interface_name)

1651

def func(self):

1652

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

1653

"true" }

1654

# Find an unused name

1655

for aname in (iname.format(i)

1656

for i in itertools.count()):

1657

if aname not in attr:

1658

attr[aname] = func

1659

break

1660

if interface_names:

1661

# Replace the class with a new subclass of it with

1662

# methods, signals, etc. as created above.

1663

if sys.version_info.major == 2:

1664

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

1665

(cls, ), attr)

1666

else:

1667

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

1668

(cls, ), attr)

1669

return cls

1670

1671

return wrapper

1672

1673

1674

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

1675

"se.bsnet.fukt.Mandos"})

762

1676

class ClientDBus(Client, DBusObjectWithProperties):

763

1677

"""A Client class using D-Bus

764

1678

768

1682

"""

769

1683

770

1684

runtime_expansions = (Client.runtime_expansions

771

+ ("dbus_object_path",))

1685

+ ("dbus_object_path", ))

1686

1687

_interface = "se.recompile.Mandos.Client"

772

1688

773

1689

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

774

1690

775

1691

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

776

self._approvals_pending = 0

777

1692

self.bus = bus

778

1693

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

779

1694

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

780

1695

# the D-Bus

781

client_object_name = unicode(self.name).translate(

1696

client_object_name = str(self.name).translate(

782

1697

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

783

1698

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

784

self.dbus_object_path = (dbus.ObjectPath

785

("/clients/" + client_object_name))

1699

self.dbus_object_path = dbus.ObjectPath(

1700

"/clients/" + client_object_name)

786

1701

DBusObjectWithProperties.__init__(self, self.bus,

787

1702

self.dbus_object_path)

1703

1704

def notifychangeproperty(transform_func, dbus_name,

1705

type_func=lambda x: x,

1706

variant_level=1,

1707

invalidate_only=False,

1708

_interface=_interface):

1709

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

1710

its changes to DBus.

788

1711

789

def notifychangeproperty(transform_func,

790

dbus_name, type_func=lambda x: x,

791

variant_level=1):

792

""" Modify a variable so that its a property that announce its

793

changes to DBus.

794

transform_fun: Function that takes a value and transform it to

795

DBus type.

796

dbus_name: DBus name of the variable

1712

transform_fun: Function that takes a value and a variant_level

1713

and transforms it to a D-Bus type.

1714

dbus_name: D-Bus name of the variable

797

1715

type_func: Function that transform the value before sending it

798

to DBus

799

variant_level: DBus variant level. default: 1

1716

to the D-Bus. Default: no transform

1717

variant_level: D-Bus variant level. Default: 1

800

1718

"""

801

real_value = [None,]

1719

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

1720

802

1721

def setter(self, value):

803

old_value = real_value[0]

804

real_value[0] = value

805

1722

if hasattr(self, "dbus_object_path"):

806

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

807

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

808

variant_level)

809

self.PropertyChanged(dbus.String(dbus_name),

810

dbus_value)

1723

if (not hasattr(self, attrname) or

1724

type_func(getattr(self, attrname, None))

1725

!= type_func(value)):

1726

if invalidate_only:

1727

self.PropertiesChanged(

1728

_interface, dbus.Dictionary(),

1729

dbus.Array((dbus_name, )))

1730

else:

1731

dbus_value = transform_func(

1732

type_func(value),

1733

variant_level = variant_level)

1734

self.PropertyChanged(dbus.String(dbus_name),

1735

dbus_value)

1736

self.PropertiesChanged(

1737

_interface,

1738

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

1739

dbus_value }),

1740

dbus.Array())

1741

setattr(self, attrname, value)

811

1742

812

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

813

1743

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

814

1744

815

1745

expires = notifychangeproperty(datetime_to_dbus, "Expires")

816

1746

approvals_pending = notifychangeproperty(dbus.Boolean,

819

1749

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

820

1750

last_enabled = notifychangeproperty(datetime_to_dbus,

821

1751

"LastEnabled")

822

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

823

type_func = lambda checker: checker is not None)

1752

checker = notifychangeproperty(

1753

dbus.Boolean, "CheckerRunning",

1754

type_func = lambda checker: checker is not None)

824

1755

last_checked_ok = notifychangeproperty(datetime_to_dbus,

825

1756

"LastCheckedOK")

826

last_approval_request = notifychangeproperty(datetime_to_dbus,

827

"LastApprovalRequest")

1757

last_checker_status = notifychangeproperty(dbus.Int16,

1758

"LastCheckerStatus")

1759

last_approval_request = notifychangeproperty(

1760

datetime_to_dbus, "LastApprovalRequest")

828

1761

approved_by_default = notifychangeproperty(dbus.Boolean,

829

1762

"ApprovedByDefault")

830

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

831

type_func = _timedelta_to_milliseconds)

832

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

833

type_func = _timedelta_to_milliseconds)

1763

approval_delay = notifychangeproperty(

1764

dbus.UInt64, "ApprovalDelay",

1765

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

1766

approval_duration = notifychangeproperty(

1767

dbus.UInt64, "ApprovalDuration",

1768

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

834

1769

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

835

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

836

type_func = _timedelta_to_milliseconds)

837

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

838

type_func = _timedelta_to_milliseconds)

839

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

840

type_func = _timedelta_to_milliseconds)

1770

timeout = notifychangeproperty(

1771

dbus.UInt64, "Timeout",

1772

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

1773

extended_timeout = notifychangeproperty(

1774

dbus.UInt64, "ExtendedTimeout",

1775

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

1776

interval = notifychangeproperty(

1777

dbus.UInt64, "Interval",

1778

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

841

1779

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

1780

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

1781

invalidate_only=True)

842

1782

843

1783

del notifychangeproperty

844

1784

851

1791

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

852

1792

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

853

1793

854

def checker_callback(self, pid, condition, command,

855

*args, **kwargs):

856

self.checker_callback_tag = None

857

self.checker = None

858

if os.WIFEXITED(condition):

859

exitstatus = os.WEXITSTATUS(condition)

1794

def checker_callback(self, source, condition,

1795

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

1796

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

1797

connection, command, *args,

1798

**kwargs)

1799

exitstatus = self.last_checker_status

1800

if exitstatus >= 0:

860

1801

# Emit D-Bus signal

861

1802

self.CheckerCompleted(dbus.Int16(exitstatus),

862

dbus.Int64(condition),

1803

# This is specific to GNU libC

1804

dbus.Int64(exitstatus << 8),

863

1805

dbus.String(command))

864

1806

else:

865

1807

# Emit D-Bus signal

866

1808

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

867

dbus.Int64(condition),

1809

dbus.Int64(

1810

# This is specific to GNU libC

1811

(exitstatus << 8)

1812

| self.last_checker_signal),

868

1813

dbus.String(command))

869

870

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

871

*args, **kwargs)

1814

return ret

872

1815

873

1816

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

874

old_checker = self.checker

875

if self.checker is not None:

876

old_checker_pid = self.checker.pid

877

else:

878

old_checker_pid = None

1817

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

879

1818

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

880

1819

# Only if new checker process was started

881

1820

if (self.checker is not None

885

1824

return r

886

1825

887

1826

def _reset_approved(self):

888

self._approved = None

1827

self.approved = None

889

1828

return False

890

1829

891

1830

def approve(self, value=True):

1831

self.approved = value

1832

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

1833

* 1000), self._reset_approved)

892

1834

self.send_changedstate()

893

self._approved = value

894

gobject.timeout_add(_timedelta_to_milliseconds

895

(self.approval_duration),

896

self._reset_approved)

897

898

1835

899

1836

## D-Bus methods, signals & properties

900

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

1837

1838

## Interfaces

901

1839

902

1840

## Signals

903

1841

914

1852

pass

915

1853

916

1854

# PropertyChanged - signal

1855

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

917

1856

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

918

1857

def PropertyChanged(self, property, value):

919

1858

"D-Bus signal"

953

1892

self.checked_ok()

954

1893

955

1894

# Enable - method

1895

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

956

1896

@dbus.service.method(_interface)

957

1897

def Enable(self):

958

1898

"D-Bus method"

959

1899

self.enable()

960

1900

961

1901

# StartChecker - method

1902

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

962

1903

@dbus.service.method(_interface)

963

1904

def StartChecker(self):

964

1905

"D-Bus method"

965

1906

self.start_checker()

966

1907

967

1908

# Disable - method

1909

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

968

1910

@dbus.service.method(_interface)

969

1911

def Disable(self):

970

1912

"D-Bus method"

971

1913

self.disable()

972

1914

973

1915

# StopChecker - method

1916

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

974

1917

@dbus.service.method(_interface)

975

1918

def StopChecker(self):

976

1919

self.stop_checker()

983

1926

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

984

1927

985

1928

# ApprovedByDefault - property

986

@dbus_service_property(_interface, signature="b",

1929

@dbus_service_property(_interface,

1930

signature="b",

987

1931

access="readwrite")

988

1932

def ApprovedByDefault_dbus_property(self, value=None):

989

1933

if value is None: # get

991

1935

self.approved_by_default = bool(value)

992

1936

993

1937

# ApprovalDelay - property

994

@dbus_service_property(_interface, signature="t",

1938

@dbus_service_property(_interface,

1939

signature="t",

995

1940

access="readwrite")

996

1941

def ApprovalDelay_dbus_property(self, value=None):

997

1942

if value is None: # get

998

return dbus.UInt64(self.approval_delay_milliseconds())

1943

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

1944

* 1000)

999

1945

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

1000

1946

1001

1947

# ApprovalDuration - property

1002

@dbus_service_property(_interface, signature="t",

1948

@dbus_service_property(_interface,

1949

signature="t",

1003

1950

access="readwrite")

1004

1951

def ApprovalDuration_dbus_property(self, value=None):

1005

1952

if value is None: # get

1006

return dbus.UInt64(_timedelta_to_milliseconds(

1007

self.approval_duration))

1953

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

1954

* 1000)

1008

1955

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

1009

1956

1010

1957

# Name - property

1958

@dbus_annotations(

1959

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

1011

1960

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

1012

1961

def Name_dbus_property(self):

1013

1962

return dbus.String(self.name)

1014

1963

1015

1964

# Fingerprint - property

1965

@dbus_annotations(

1966

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

1016

1967

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

1017

1968

def Fingerprint_dbus_property(self):

1018

1969

return dbus.String(self.fingerprint)

1019

1970

1020

1971

# Host - property

1021

@dbus_service_property(_interface, signature="s",

1972

@dbus_service_property(_interface,

1973

signature="s",

1022

1974

access="readwrite")

1023

1975

def Host_dbus_property(self, value=None):

1024

1976

if value is None: # get

1025

1977

return dbus.String(self.host)

1026

self.host = value

1978

self.host = str(value)

1027

1979

1028

1980

# Created - property

1981

@dbus_annotations(

1982

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

1029

1983

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

1030

1984

def Created_dbus_property(self):

1031

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

1985

return datetime_to_dbus(self.created)

1032

1986

1033

1987

# LastEnabled - property

1034

1988

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

1036

1990

return datetime_to_dbus(self.last_enabled)

1037

1991

1038

1992

# Enabled - property

1039

@dbus_service_property(_interface, signature="b",

1993

@dbus_service_property(_interface,

1994

signature="b",

1040

1995

access="readwrite")

1041

1996

def Enabled_dbus_property(self, value=None):

1042

1997

if value is None: # get

1047

2002

self.disable()

1048

2003

1049

2004

# LastCheckedOK - property

1050

@dbus_service_property(_interface, signature="s",

2005

@dbus_service_property(_interface,

2006

signature="s",

1051

2007

access="readwrite")

1052

2008

def LastCheckedOK_dbus_property(self, value=None):

1053

2009

if value is not None:

1055

2011

return

1056

2012

return datetime_to_dbus(self.last_checked_ok)

1057

2013

2014

# LastCheckerStatus - property

2015

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

2016

def LastCheckerStatus_dbus_property(self):

2017

return dbus.Int16(self.last_checker_status)

2018

1058

2019

# Expires - property

1059

2020

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

1060

2021

def Expires_dbus_property(self):

1066

2027

return datetime_to_dbus(self.last_approval_request)

1067

2028

1068

2029

# Timeout - property

1069

@dbus_service_property(_interface, signature="t",

2030

@dbus_service_property(_interface,

2031

signature="t",

1070

2032

access="readwrite")

1071

2033

def Timeout_dbus_property(self, value=None):

1072

2034

if value is None: # get

1073

return dbus.UInt64(self.timeout_milliseconds())

2035

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

2036

old_timeout = self.timeout

1074

2037

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

1075

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

1076

return

1077

# Reschedule timeout

1078

gobject.source_remove(self.disable_initiator_tag)

1079

self.disable_initiator_tag = None

1080

self.expires = None

1081

time_to_die = (self.

1082

_timedelta_to_milliseconds((self

1083

.last_checked_ok

1084

+ self.timeout)

1085

- datetime.datetime

1086

.utcnow()))

1087

if time_to_die <= 0:

1088

# The timeout has passed

1089

self.disable()

1090

else:

1091

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

1092

+ datetime.timedelta(milliseconds = time_to_die))

1093

self.disable_initiator_tag = (gobject.timeout_add

1094

(time_to_die, self.disable))

2038

# Reschedule disabling

2039

if self.enabled:

2040

now = datetime.datetime.utcnow()

2041

self.expires += self.timeout - old_timeout

2042

if self.expires <= now:

2043

# The timeout has passed

2044

self.disable()

2045

else:

2046

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

2047

is None):

2048

return

2049

GLib.source_remove(self.disable_initiator_tag)

2050

self.disable_initiator_tag = GLib.timeout_add(

2051

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

2052

self.disable)

1095

2053

1096

2054

# ExtendedTimeout - property

1097

@dbus_service_property(_interface, signature="t",

2055

@dbus_service_property(_interface,

2056

signature="t",

1098

2057

access="readwrite")

1099

2058

def ExtendedTimeout_dbus_property(self, value=None):

1100

2059

if value is None: # get

1101

return dbus.UInt64(self.extended_timeout_milliseconds())

2060

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

2061

* 1000)

1102

2062

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

1103

2063

1104

2064

# Interval - property

1105

@dbus_service_property(_interface, signature="t",

2065

@dbus_service_property(_interface,

2066

signature="t",

1106

2067

access="readwrite")

1107

2068

def Interval_dbus_property(self, value=None):

1108

2069

if value is None: # get

1109

return dbus.UInt64(self.interval_milliseconds())

2070

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

1110

2071

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

1111

2072

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

1112

2073

return

1113

# Reschedule checker run

1114

gobject.source_remove(self.checker_initiator_tag)

1115

self.checker_initiator_tag = (gobject.timeout_add

1116

(value, self.start_checker))

1117

self.start_checker() # Start one now, too

2074

if self.enabled:

2075

# Reschedule checker run

2076

GLib.source_remove(self.checker_initiator_tag)

2077

self.checker_initiator_tag = GLib.timeout_add(

2078

value, self.start_checker)

2079

self.start_checker() # Start one now, too

1118

2080

1119

2081

# Checker - property

1120

@dbus_service_property(_interface, signature="s",

2082

@dbus_service_property(_interface,

2083

signature="s",

1121

2084

access="readwrite")

1122

2085

def Checker_dbus_property(self, value=None):

1123

2086

if value is None: # get

1124

2087

return dbus.String(self.checker_command)

1125

self.checker_command = value

2088

self.checker_command = str(value)

1126

2089

1127

2090

# CheckerRunning - property

1128

@dbus_service_property(_interface, signature="b",

2091

@dbus_service_property(_interface,

2092

signature="b",

1129

2093

access="readwrite")

1130

2094

def CheckerRunning_dbus_property(self, value=None):

1131

2095

if value is None: # get

1136

2100

self.stop_checker()

1137

2101

1138

2102

# ObjectPath - property

2103

@dbus_annotations(

2104

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

2105

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

1139

2106

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

1140

2107

def ObjectPath_dbus_property(self):

1141

2108

return self.dbus_object_path # is already a dbus.ObjectPath

1142

2109

1143

2110

# Secret = property

1144

@dbus_service_property(_interface, signature="ay",

1145

access="write", byte_arrays=True)

2111

@dbus_annotations(

2112

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

2113

"invalidates"})

2114

@dbus_service_property(_interface,

2115

signature="ay",

2116

access="write",

2117

byte_arrays=True)

1146

2118

def Secret_dbus_property(self, value):

1147

self.secret = str(value)

2119

self.secret = bytes(value)

1148

2120

1149

2121

del _interface

1150

2122

1154

2126

self._pipe = child_pipe

1155

2127

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

1156

2128

if not self._pipe.recv():

1157

raise KeyError()

2129

raise KeyError(fpr)

1158

2130

1159

2131

def __getattribute__(self, name):

1160

if(name == '_pipe'):

2132

if name == '_pipe':

1161

2133

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

1162

2134

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

1163

2135

data = self._pipe.recv()

1164

2136

if data[0] == 'data':

1165

2137

return data[1]

1166

2138

if data[0] == 'function':

2139

1167

2140

def func(*args, **kwargs):

1168

2141

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

1169

2142

return self._pipe.recv()[1]

2143

1170

2144

return func

1171

2145

1172

2146

def __setattr__(self, name, value):

1173

if(name == '_pipe'):

2147

if name == '_pipe':

1174

2148

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

1175

2149

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

1176

2150

1184

2158

def handle(self):

1185

2159

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

1186

2160

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

1187

unicode(self.client_address))

2161

str(self.client_address))

1188

2162

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

1189

2163

self.server.child_pipe.fileno())

1190

2164

1191

session = (gnutls.connection

1192

.ClientSession(self.request,

1193

gnutls.connection

1194

.X509Credentials()))

1195

1196

# Note: gnutls.connection.X509Credentials is really a

1197

# generic GnuTLS certificate credentials object so long as

1198

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

1199

# here despite using OpenPGP certificates.

2165

session = gnutls.ClientSession(self.request)

1200

2166

1201

2167

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

1202

2168

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

1206

2172

priority = self.server.gnutls_priority

1207

2173

if priority is None:

1208

2174

priority = "NORMAL"

1209

(gnutls.library.functions

1210

.gnutls_priority_set_direct(session._c_object,

1211

priority, None))

2175

gnutls.priority_set_direct(session._c_object, priority,

2176

None)

1212

2177

1213

2178

# Start communication using the Mandos protocol

1214

2179

# Get protocol number

1216

2181

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

1217

2182

try:

1218

2183

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

1219

raise RuntimeError

2184

raise RuntimeError(line)

1220

2185

except (ValueError, IndexError, RuntimeError) as error:

1221

2186

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

1222

2187

return

1224

2189

# Start GnuTLS connection

1225

2190

try:

1226

2191

session.handshake()

1227

except gnutls.errors.GNUTLSError as error:

2192

except gnutls.Error as error:

1228

2193

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

1229

2194

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

1230

2195

# established. Just abandon the request.

1234

2199

approval_required = False

1235

2200

try:

1236

2201

try:

1237

fpr = self.fingerprint(self.peer_certificate

1238

(session))

1239

except (TypeError,

1240

gnutls.errors.GNUTLSError) as error:

2202

fpr = self.fingerprint(

2203

self.peer_certificate(session))

2204

except (TypeError, gnutls.Error) as error:

1241

2205

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

1242

2206

return

1243

2207

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

1256

2220

while True:

1257

2221

if not client.enabled:

1258

2222

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

1259

client.name)

2223

client.name)

1260

2224

if self.server.use_dbus:

1261

2225

# Emit D-Bus signal

1262

client.Rejected("Disabled")

2226

client.Rejected("Disabled")

1263

2227

return

1264

2228

1265

if client._approved or not client.approval_delay:

2229

if client.approved or not client.approval_delay:

1266

2230

#We are approved or approval is disabled

1267

2231

break

1268

elif client._approved is None:

2232

elif client.approved is None:

1269

2233

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

1270

2234

client.name)

1271

2235

if self.server.use_dbus:

1272

2236

# Emit D-Bus signal

1273

2237

client.NeedApproval(

1274

client.approval_delay_milliseconds(),

1275

client.approved_by_default)

2238

client.approval_delay.total_seconds()

2239

* 1000, client.approved_by_default)

1276

2240

else:

1277

2241

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

1278

2242

client.name)

1282

2246

return

1283

2247

1284

2248

#wait until timeout or approved

1285

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

1286

2249

time = datetime.datetime.now()

1287

2250

client.changedstate.acquire()

1288

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

2251

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

1289

2252

client.changedstate.release()

1290

2253

time2 = datetime.datetime.now()

1291

2254

if (time2 - time) >= delay:

1302

2265

else:

1303

2266

delay -= time2 - time

1304

2267

1305

sent_size = 0

1306

while sent_size < len(client.secret):

1307

try:

1308

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

1309

except gnutls.errors.GNUTLSError as error:

1310

logger.warning("gnutls send failed")

1311

return

1312

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

1313

sent, len(client.secret)

1314

- (sent_size + sent))

1315

sent_size += sent

2268

try:

2269

session.send(client.secret)

2270

except gnutls.Error as error:

2271

logger.warning("gnutls send failed",

2272

exc_info = error)

2273

return

1316

2274

1317

2275

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

1318

# bump the timeout as if seen

1319

client.checked_ok(client.extended_timeout)

2276

# bump the timeout using extended_timeout

2277

client.bump_timeout(client.extended_timeout)

1320

2278

if self.server.use_dbus:

1321

2279

# Emit D-Bus signal

1322

2280

client.GotSecret()

1326

2284

client.approvals_pending -= 1

1327

2285

try:

1328

2286

session.bye()

1329

except gnutls.errors.GNUTLSError as error:

1330

logger.warning("GnuTLS bye failed")

2287

except gnutls.Error as error:

2288

logger.warning("GnuTLS bye failed",

2289

exc_info=error)

1331

2290

1332

2291

@staticmethod

1333

2292

def peer_certificate(session):

1334

2293

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

1335

2294

# If not an OpenPGP certificate...

1336

if (gnutls.library.functions

1337

.gnutls_certificate_type_get(session._c_object)

1338

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

1339

# ...do the normal thing

1340

return session.peer_certificate

2295

if (gnutls.certificate_type_get(session._c_object)

2296

!= gnutls.CRT_OPENPGP):

2297

# ...return invalid data

2298

return b""

1341

2299

list_size = ctypes.c_uint(1)

1342

cert_list = (gnutls.library.functions

1343

.gnutls_certificate_get_peers

2300

cert_list = (gnutls.certificate_get_peers

1344

2301

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

1345

2302

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

1346

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

1347

" certificate")

2303

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

1348

2304

if list_size.value == 0:

1349

2305

return None

1350

2306

cert = cert_list[0]

1354

2310

def fingerprint(openpgp):

1355

2311

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

1356

2312

# New GnuTLS "datum" with the OpenPGP public key

1357

datum = (gnutls.library.types

1358

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

1359

ctypes.POINTER

1360

(ctypes.c_ubyte)),

1361

ctypes.c_uint(len(openpgp))))

2313

datum = gnutls.datum_t(

2314

ctypes.cast(ctypes.c_char_p(openpgp),

2315

ctypes.POINTER(ctypes.c_ubyte)),

2316

ctypes.c_uint(len(openpgp)))

1362

2317

# New empty GnuTLS certificate

1363

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1364

(gnutls.library.functions

1365

.gnutls_openpgp_crt_init(ctypes.byref(crt)))

2318

crt = gnutls.openpgp_crt_t()

2319

gnutls.openpgp_crt_init(ctypes.byref(crt))

1366

2320

# Import the OpenPGP public key into the certificate

1367

(gnutls.library.functions

1368

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

1369

gnutls.library.constants

1370

.GNUTLS_OPENPGP_FMT_RAW))

2321

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

2322

gnutls.OPENPGP_FMT_RAW)

1371

2323

# Verify the self signature in the key

1372

2324

crtverify = ctypes.c_uint()

1373

(gnutls.library.functions

1374

.gnutls_openpgp_crt_verify_self(crt, 0,

1375

ctypes.byref(crtverify)))

2325

gnutls.openpgp_crt_verify_self(crt, 0,

2326

ctypes.byref(crtverify))

1376

2327

if crtverify.value != 0:

1377

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1378

raise (gnutls.errors.CertificateSecurityError

1379

("Verify failed"))

2328

gnutls.openpgp_crt_deinit(crt)

2329

raise gnutls.CertificateSecurityError("Verify failed")

1380

2330

# New buffer for the fingerprint

1381

2331

buf = ctypes.create_string_buffer(20)

1382

2332

buf_len = ctypes.c_size_t()

1383

2333

# Get the fingerprint from the certificate into the buffer

1384

(gnutls.library.functions

1385

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

1386

ctypes.byref(buf_len)))

2334

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

2335

ctypes.byref(buf_len))

1387

2336

# Deinit the certificate

1388

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2337

gnutls.openpgp_crt_deinit(crt)

1389

2338

# Convert the buffer to a Python bytestring

1390

2339

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

1391

2340

# Convert the bytestring to hexadecimal notation

1392

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

2341

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

1393

2342

return hex_fpr

1394

2343

1395

2344

1396

2345

class MultiprocessingMixIn(object):

1397

2346

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

2347

1398

2348

def sub_process_main(self, request, address):

1399

2349

try:

1400

2350

self.finish_request(request, address)

1401

except:

2351

except Exception:

1402

2352

self.handle_error(request, address)

1403

2353

self.close_request(request)

1404

2354

1405

2355

def process_request(self, request, address):

1406

2356

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

1407

multiprocessing.Process(target = self.sub_process_main,

1408

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

2357

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

2358

args = (request, address))

2359

proc.start()

2360

return proc

1409

2361

1410

2362

1411

2363

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1412

2364

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

2365

1413

2366

def process_request(self, request, client_address):

1414

2367

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

1415

2368

1417

2370

"""

1418

2371

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1419

2372

1420

super(MultiprocessingMixInWithPipe,

1421

self).process_request(request, client_address)

2373

proc = MultiprocessingMixIn.process_request(self, request,

2374

client_address)

1422

2375

self.child_pipe.close()

1423

self.add_pipe(parent_pipe)

2376

self.add_pipe(parent_pipe, proc)

1424

2377

1425

def add_pipe(self, parent_pipe):

2378

def add_pipe(self, parent_pipe, proc):

1426

2379

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

1427

raise NotImplementedError

2380

raise NotImplementedError()

1428

2381

1429

2382

1430

2383

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1436

2389

interface: None or a network interface name (string)

1437

2390

use_ipv6: Boolean; to use IPv6 or not

1438

2391

"""

2392

1439

2393

def __init__(self, server_address, RequestHandlerClass,

1440

interface=None, use_ipv6=True):

2394

interface=None,

2395

use_ipv6=True,

2396

socketfd=None):

2397

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

2398

creating a new one with socket.socket().

2399

"""

1441

2400

self.interface = interface

1442

2401

if use_ipv6:

1443

2402

self.address_family = socket.AF_INET6

2403

if socketfd is not None:

2404

# Save the file descriptor

2405

self.socketfd = socketfd

2406

# Save the original socket.socket() function

2407

self.socket_socket = socket.socket

2408

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

2409

#

2410

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

2411

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

2412

# patching socket.socket.)

2413

#

2414

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

2415

@functools.wraps(socket.socket)

2416

def socket_wrapper(*args, **kwargs):

2417

# Restore original function so subsequent calls are

2418

# not affected.

2419

socket.socket = self.socket_socket

2420

del self.socket_socket

2421

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

2422

# saved file descriptor.

2423

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

2424

# Replace socket.socket() function with wrapper

2425

socket.socket = socket_wrapper

2426

# The socketserver.TCPServer.__init__ will call

2427

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

2428

# socket_wrapper(), if socketfd was set.

1444

2429

socketserver.TCPServer.__init__(self, server_address,

1445

2430

RequestHandlerClass)

2431

1446

2432

def server_bind(self):

1447

2433

"""This overrides the normal server_bind() function

1448

2434

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

1454

2440

self.interface)

1455

2441

else:

1456

2442

try:

1457

self.socket.setsockopt(socket.SOL_SOCKET,

1458

SO_BINDTODEVICE,

1459

str(self.interface

1460

+ '\0'))

2443

self.socket.setsockopt(

2444

socket.SOL_SOCKET, SO_BINDTODEVICE,

2445

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

1461

2446

except socket.error as error:

1462

if error[0] == errno.EPERM:

1463

logger.error("No permission to"

1464

" bind to interface %s",

1465

self.interface)

1466

elif error[0] == errno.ENOPROTOOPT:

2447

if error.errno == errno.EPERM:

2448

logger.error("No permission to bind to"

2449

" interface %s", self.interface)

2450

elif error.errno == errno.ENOPROTOOPT:

1467

2451

logger.error("SO_BINDTODEVICE not available;"

1468

2452

" cannot bind to interface %s",

1469

2453

self.interface)

2454

elif error.errno == errno.ENODEV:

2455

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

2456

" cannot bind", self.interface)

1470

2457

else:

1471

2458

raise

1472

2459

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

1475

2462

if self.address_family == socket.AF_INET6:

1476

2463

any_address = "::" # in6addr_any

1477

2464

else:

1478

any_address = socket.INADDR_ANY

2465

any_address = "0.0.0.0" # INADDR_ANY

1479

2466

self.server_address = (any_address,

1480

2467

self.server_address[1])

1481

2468

elif not self.server_address[1]:

1482

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

1483

0)

2469

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

1484

2470

# if self.interface:

1485

2471

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

1486

2472

# 0, # port

1498

2484

gnutls_priority GnuTLS priority string

1499

2485

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

1500

2486

1501

Assumes a gobject.MainLoop event loop.

2487

Assumes a GLib.MainLoop event loop.

1502

2488

"""

2489

1503

2490

def __init__(self, server_address, RequestHandlerClass,

1504

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

1505

gnutls_priority=None, use_dbus=True):

2491

interface=None,

2492

use_ipv6=True,

2493

clients=None,

2494

gnutls_priority=None,

2495

use_dbus=True,

2496

socketfd=None):

1506

2497

self.enabled = False

1507

2498

self.clients = clients

1508

2499

if self.clients is None:

1509

self.clients = set()

2500

self.clients = {}

1510

2501

self.use_dbus = use_dbus

1511

2502

self.gnutls_priority = gnutls_priority

1512

2503

IPv6_TCPServer.__init__(self, server_address,

1513

2504

RequestHandlerClass,

1514

2505

interface = interface,

1515

use_ipv6 = use_ipv6)

2506

use_ipv6 = use_ipv6,

2507

socketfd = socketfd)

2508

1516

2509

def server_activate(self):

1517

2510

if self.enabled:

1518

2511

return socketserver.TCPServer.server_activate(self)

2512

1519

2513

def enable(self):

1520

2514

self.enabled = True

1521

def add_pipe(self, parent_pipe):

2515

2516

def add_pipe(self, parent_pipe, proc):

1522

2517

# Call "handle_ipc" for both data and EOF events

1523

gobject.io_add_watch(parent_pipe.fileno(),

1524

gobject.IO_IN | gobject.IO_HUP,

1525

functools.partial(self.handle_ipc,

1526

parent_pipe = parent_pipe))

1527

1528

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

2518

GLib.io_add_watch(

2519

parent_pipe.fileno(),

2520

GLib.IO_IN | GLib.IO_HUP,

2521

functools.partial(self.handle_ipc,

2522

parent_pipe = parent_pipe,

2523

proc = proc))

2524

2525

def handle_ipc(self, source, condition,

2526

parent_pipe=None,

2527

proc = None,

1529

2528

client_object=None):

1530

condition_names = {

1531

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

1532

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

1533

# blocking).

1534

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

1535

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

1536

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

1537

# broken, usually for pipes and

1538

# sockets).

1539

}

1540

conditions_string = ' | '.join(name

1541

for cond, name in

1542

condition_names.iteritems()

1543

if cond & condition)

1544

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

1545

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

2529

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

2530

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

2531

# Wait for other process to exit

2532

proc.join()

1546

2533

return False

1547

2534

1548

2535

# Read a request from the child

1553

2540

fpr = request[1]

1554

2541

address = request[2]

1555

2542

1556

for c in self.clients:

2543

for c in self.clients.values():

1557

2544

if c.fingerprint == fpr:

1558

2545

client = c

1559

2546

break

1562

2549

"dress: %s", fpr, address)

1563

2550

if self.use_dbus:

1564

2551

# Emit D-Bus signal

1565

mandos_dbus_service.ClientNotFound(fpr, address[0])

2552

mandos_dbus_service.ClientNotFound(fpr,

2553

address[0])

1566

2554

parent_pipe.send(False)

1567

2555

return False

1568

2556

1569

gobject.io_add_watch(parent_pipe.fileno(),

1570

gobject.IO_IN | gobject.IO_HUP,

1571

functools.partial(self.handle_ipc,

1572

parent_pipe = parent_pipe,

1573

client_object = client))

2557

GLib.io_add_watch(

2558

parent_pipe.fileno(),

2559

GLib.IO_IN | GLib.IO_HUP,

2560

functools.partial(self.handle_ipc,

2561

parent_pipe = parent_pipe,

2562

proc = proc,

2563

client_object = client))

1574

2564

parent_pipe.send(True)

1575

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

2565

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

2566

# same fileno

1576

2567

return False

1577

2568

if command == 'funcall':

1578

2569

funcname = request[1]

1579

2570

args = request[2]

1580

2571

kwargs = request[3]

1581

2572

1582

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

2573

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

2574

funcname)(*args,

2575

**kwargs)))

1583

2576

1584

2577

if command == 'getattr':

1585

2578

attrname = request[1]

1586

if callable(client_object.__getattribute__(attrname)):

1587

parent_pipe.send(('function',))

2579

if isinstance(client_object.__getattribute__(attrname),

2580

collections.Callable):

2581

parent_pipe.send(('function', ))

1588

2582

else:

1589

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

2583

parent_pipe.send((

2584

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

1590

2585

1591

2586

if command == 'setattr':

1592

2587

attrname = request[1]

1596

2591

return True

1597

2592

1598

2593

2594

def rfc3339_duration_to_delta(duration):

2595

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

2596

2597

>>> rfc3339_duration_to_delta("P7D")

2598

datetime.timedelta(7)

2599

>>> rfc3339_duration_to_delta("PT60S")

2600

datetime.timedelta(0, 60)

2601

>>> rfc3339_duration_to_delta("PT60M")

2602

datetime.timedelta(0, 3600)

2603

>>> rfc3339_duration_to_delta("PT24H")

2604

datetime.timedelta(1)

2605

>>> rfc3339_duration_to_delta("P1W")

2606

datetime.timedelta(7)

2607

>>> rfc3339_duration_to_delta("PT5M30S")

2608

datetime.timedelta(0, 330)

2609

>>> rfc3339_duration_to_delta("P1DT3M20S")

2610

datetime.timedelta(1, 200)

2611

"""

2612

2613

# Parsing an RFC 3339 duration with regular expressions is not

2614

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

2615

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

2616

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

2617

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

2618

# avoid excessive use of external libraries.

2619

2620

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

2621

Token = collections.namedtuple("Token", (

2622

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

2623

# a "group" containing digits

2624

"value", # datetime.timedelta or None

2625

"followers")) # Tokens valid after this token

2626

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

2627

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

2628

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

2629

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

2630

datetime.timedelta(seconds=1),

2631

frozenset((token_end, )))

2632

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

2633

datetime.timedelta(minutes=1),

2634

frozenset((token_second, token_end)))

2635

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

2636

datetime.timedelta(hours=1),

2637

frozenset((token_minute, token_end)))

2638

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

2639

None,

2640

frozenset((token_hour, token_minute,

2641

token_second)))

2642

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

2643

datetime.timedelta(days=1),

2644

frozenset((token_time, token_end)))

2645

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

2646

datetime.timedelta(weeks=4),

2647

frozenset((token_day, token_end)))

2648

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

2649

datetime.timedelta(weeks=52),

2650

frozenset((token_month, token_end)))

2651

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

2652

datetime.timedelta(weeks=1),

2653

frozenset((token_end, )))

2654

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

2655

frozenset((token_year, token_month,

2656

token_day, token_time,

2657

token_week)))

2658

# Define starting values

2659

value = datetime.timedelta() # Value so far

2660

found_token = None

2661

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

2662

s = duration # String left to parse

2663

# Loop until end token is found

2664

while found_token is not token_end:

2665

# Search for any currently valid tokens

2666

for token in followers:

2667

match = token.regexp.match(s)

2668

if match is not None:

2669

# Token found

2670

if token.value is not None:

2671

# Value found, parse digits

2672

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

2673

# Add to value so far

2674

value += factor * token.value

2675

# Strip token from string

2676

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

2677

# Go to found token

2678

found_token = token

2679

# Set valid next tokens

2680

followers = found_token.followers

2681

break

2682

else:

2683

# No currently valid tokens were found

2684

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

2685

.format(duration))

2686

# End token found

2687

return value

2688

2689

1599

2690

def string_to_delta(interval):

1600

2691

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

1601

2692

1612

2703

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

1613

2704

datetime.timedelta(0, 330)

1614

2705

"""

2706

2707

try:

2708

return rfc3339_duration_to_delta(interval)

2709

except ValueError:

2710

pass

2711

1615

2712

timevalue = datetime.timedelta(0)

1616

2713

for s in interval.split():

1617

2714

try:

1618

suffix = unicode(s[-1])

2715

suffix = s[-1]

1619

2716

value = int(s[:-1])

1620

2717

if suffix == "d":

1621

2718

delta = datetime.timedelta(value)

1628

2725

elif suffix == "w":

1629

2726

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

1630

2727

else:

1631

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

1632

except (ValueError, IndexError) as e:

2728

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

2729

except IndexError as e:

1633

2730

raise ValueError(*(e.args))

1634

2731

timevalue += delta

1635

2732

return timevalue

1636

2733

1637

2734

1638

def if_nametoindex(interface):

1639

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

1640

1641

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

1642

global if_nametoindex

1643

try:

1644

if_nametoindex = (ctypes.cdll.LoadLibrary

1645

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

1646

.if_nametoindex)

1647

except (OSError, AttributeError):

1648

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

1649

def if_nametoindex(interface):

1650

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

1651

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

1652

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

1653

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1654

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

1655

interface))

1656

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

1657

ifreq[16:20])[0]

1658

return interface_index

1659

return if_nametoindex(interface)

1660

1661

1662

2735

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

1663

2736

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

1664

2737

1672

2745

sys.exit()

1673

2746

if not noclose:

1674

2747

# Close all standard open file descriptors

1675

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

2748

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

1676

2749

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

1677

2750

raise OSError(errno.ENODEV,

1678

"%s not a character device"

1679

% os.path.devnull)

2751

"{} not a character device"

2752

.format(os.devnull))

1680

2753

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

1681

2754

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

1682

2755

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

1691

2764

1692

2765

parser = argparse.ArgumentParser()

1693

2766

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

1694

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

2767

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

1695

2768

help="show version number and exit")

1696

2769

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

1697

2770

help="Bind to interface IF")

1703

2776

help="Run self-test")

1704

2777

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

1705

2778

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

1706

" to terminal")

2779

" to terminal", default=None)

1707

2780

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

1708

2781

help="Debug level for stdout output")

1709

2782

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

1716

2789

" files")

1717

2790

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

1718

2791

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

1719

" system bus interface")

2792

" system bus interface", default=None)

1720

2793

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

1721

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

2794

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

2795

default=None)

2796

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

2797

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

2798

" state", default=None)

2799

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

2800

help="Specify a file descriptor to a network"

2801

" socket to use instead of creating one")

2802

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

2803

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

2804

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

2805

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

2806

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

2807

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

2808

default=None)

2809

1722

2810

options = parser.parse_args()

1723

2811

1724

2812

if options.check:

1725

2813

import doctest

1726

doctest.testmod()

1727

sys.exit()

2814

fail_count, test_count = doctest.testmod()

2815

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

1728

2816

1729

2817

# Default values for config file for server-global settings

1730

2818

server_defaults = { "interface": "",

1732

2820

"port": "",

1733

2821

"debug": "False",

1734

2822

"priority":

1735

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

2823

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

2824

":+SIGN-DSA-SHA256",

1736

2825

"servicename": "Mandos",

1737

2826

"use_dbus": "True",

1738

2827

"use_ipv6": "True",

1739

2828

"debuglevel": "",

1740

}

2829

"restore": "True",

2830

"socket": "",

2831

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

2832

"foreground": "False",

2833

"zeroconf": "True",

2834

}

1741

2835

1742

2836

# Parse config file for server-global settings

1743

2837

server_config = configparser.SafeConfigParser(server_defaults)

1744

2838

del server_defaults

1745

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

1746

"mandos.conf"))

2839

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

1747

2840

# Convert the SafeConfigParser object to a dict

1748

2841

server_settings = server_config.defaults()

1749

2842

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

1750

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

2843

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

1751

2844

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

1752

2845

option)

1753

2846

if server_settings["port"]:

1754

2847

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

1755

2848

"port")

2849

if server_settings["socket"]:

2850

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

2851

"socket")

2852

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

2853

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

2854

# happen with a supplied network socket.

2855

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

2856

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

2857

["socket"])

1756

2858

del server_config

1757

2859

1758

2860

# Override the settings from the config file with command line

1759

2861

# options, if set.

1760

2862

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

1761

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

1762

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

2863

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

2864

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

2865

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

1763

2866

value = getattr(options, option)

1764

2867

if value is not None:

1765

2868

server_settings[option] = value

1766

2869

del options

1767

2870

# Force all strings to be unicode

1768

2871

for option in server_settings.keys():

1769

if type(server_settings[option]) is str:

1770

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

2872

if isinstance(server_settings[option], bytes):

2873

server_settings[option] = (server_settings[option]

2874

.decode("utf-8"))

2875

# Force all boolean options to be boolean

2876

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

2877

"foreground", "zeroconf"):

2878

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

2879

# Debug implies foreground

2880

if server_settings["debug"]:

2881

server_settings["foreground"] = True

1771

2882

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

1772

2883

1773

2884

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

1774

2885

2886

if (not server_settings["zeroconf"]

2887

and not (server_settings["port"]

2888

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

2889

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

2890

1775

2891

# For convenience

1776

2892

debug = server_settings["debug"]

1777

2893

debuglevel = server_settings["debuglevel"]

1778

2894

use_dbus = server_settings["use_dbus"]

1779

2895

use_ipv6 = server_settings["use_ipv6"]

2896

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

2897

stored_state_file)

2898

foreground = server_settings["foreground"]

2899

zeroconf = server_settings["zeroconf"]

2900

2901

if debug:

2902

initlogger(debug, logging.DEBUG)

2903

else:

2904

if not debuglevel:

2905

initlogger(debug)

2906

else:

2907

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

2908

initlogger(debug, level)

1780

2909

1781

2910

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

1782

syslogger.setFormatter(logging.Formatter

1783

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

1784

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

1785

% server_settings["servicename"]))

2911

syslogger.setFormatter(

2912

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

2913

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

2914

server_settings["servicename"])))

1786

2915

1787

2916

# Parse config file with clients

1788

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

1789

"extended_timeout": "15m",

1790

"interval": "2m",

1791

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

1792

"host": "",

1793

"approval_delay": "0s",

1794

"approval_duration": "1s",

1795

}

1796

client_config = configparser.SafeConfigParser(client_defaults)

2917

client_config = configparser.SafeConfigParser(Client

2918

.client_defaults)

1797

2919

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

1798

2920

"clients.conf"))

1799

2921

1800

2922

global mandos_dbus_service

1801

2923

mandos_dbus_service = None

1802

2924

1803

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

1804

server_settings["port"]),

1805

ClientHandler,

1806

interface=(server_settings["interface"]

1807

or None),

1808

use_ipv6=use_ipv6,

1809

gnutls_priority=

1810

server_settings["priority"],

1811

use_dbus=use_dbus)

1812

if not debug:

1813

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

2925

socketfd = None

2926

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

2927

socketfd = server_settings["socket"]

2928

tcp_server = MandosServer(

2929

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

2930

ClientHandler,

2931

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

2932

use_ipv6=use_ipv6,

2933

gnutls_priority=server_settings["priority"],

2934

use_dbus=use_dbus,

2935

socketfd=socketfd)

2936

if not foreground:

2937

pidfilename = "/run/mandos.pid"

2938

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

2939

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

2940

pidfile = None

1814

2941

try:

1815

pidfile = open(pidfilename, "w")

1816

except IOError:

1817

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

2942

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

2943

except IOError as e:

2944

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

2945

exc_info=e)

1818

2946

1819

try:

1820

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

1821

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

1822

except KeyError:

2947

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

2948

("mandos", "mandos"),

2949

("nobody", "nogroup")):

1823

2950

try:

1824

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

1825

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

2951

uid = pwd.getpwnam(name).pw_uid

2952

gid = pwd.getpwnam(group).pw_gid

2953

break

1826

2954

except KeyError:

1827

try:

1828

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

1829

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

1830

except KeyError:

1831

uid = 65534

1832

gid = 65534

2955

continue

2956

else:

2957

uid = 65534

2958

gid = 65534

1833

2959

try:

1834

2960

os.setgid(gid)

1835

2961

os.setuid(uid)

2962

if debug:

2963

logger.debug("Did setuid/setgid to {}:{}".format(uid,

2964

gid))

1836

2965

except OSError as error:

1837

if error[0] != errno.EPERM:

1838

raise error

1839

1840

if not debug and not debuglevel:

1841

syslogger.setLevel(logging.WARNING)

1842

console.setLevel(logging.WARNING)

1843

if debuglevel:

1844

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

1845

syslogger.setLevel(level)

1846

console.setLevel(level)

2966

logger.warning("Failed to setuid/setgid to {}:{}: {}"

2967

.format(uid, gid, os.strerror(error.errno)))

2968

if error.errno != errno.EPERM:

2969

raise

1847

2970

1848

2971

if debug:

1849

2972

# Enable all possible GnuTLS debugging

1850

2973

1851

2974

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

1852

2975

# - GnuTLS manual

1853

gnutls.library.functions.gnutls_global_set_log_level(11)

2976

gnutls.global_set_log_level(11)

1854

2977

1855

@gnutls.library.types.gnutls_log_func

2978

@gnutls.log_func

1856

2979

def debug_gnutls(level, string):

1857

2980

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

1858

2981

1859

(gnutls.library.functions

1860

.gnutls_global_set_log_function(debug_gnutls))

2982

gnutls.global_set_log_function(debug_gnutls)

1861

2983

1862

2984

# Redirect stdin so all checkers get /dev/null

1863

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

2985

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

1864

2986

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

1865

2987

if null > 2:

1866

2988

os.close(null)

1867

else:

1868

# No console logging

1869

logger.removeHandler(console)

1870

2989

1871

2990

# Need to fork before connecting to D-Bus

1872

if not debug:

2991

if not foreground:

1873

2992

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

1874

2993

daemon()

1875

2994

2995

# multiprocessing will use threads, so before we use GLib we need

2996

# to inform GLib that threads will be used.

2997

GLib.threads_init()

2998

1876

2999

global main_loop

1877

3000

# From the Avahi example code

1878

DBusGMainLoop(set_as_default=True )

1879

main_loop = gobject.MainLoop()

3001

DBusGMainLoop(set_as_default=True)

3002

main_loop = GLib.MainLoop()

1880

3003

bus = dbus.SystemBus()

1881

3004

# End of Avahi example code

1882

3005

if use_dbus:

1883

3006

try:

1884

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

1885

bus, do_not_queue=True)

1886

except dbus.exceptions.NameExistsException as e:

1887

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

3007

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

3008

bus,

3009

do_not_queue=True)

3010

old_bus_name = dbus.service.BusName(

3011

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

3012

do_not_queue=True)

3013

except dbus.exceptions.DBusException as e:

3014

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

1888

3015

use_dbus = False

1889

3016

server_settings["use_dbus"] = False

1890

3017

tcp_server.use_dbus = False

1891

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

1892

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

1893

servicetype = "_mandos._tcp",

1894

protocol = protocol, bus = bus)

1895

if server_settings["interface"]:

1896

service.interface = (if_nametoindex

1897

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

3018

if zeroconf:

3019

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

3020

service = AvahiServiceToSyslog(

3021

name = server_settings["servicename"],

3022

servicetype = "_mandos._tcp",

3023

protocol = protocol,

3024

bus = bus)

3025

if server_settings["interface"]:

3026

service.interface = if_nametoindex(

3027

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

1898

3028

1899

3029

global multiprocessing_manager

1900

3030

multiprocessing_manager = multiprocessing.Manager()

1902

3032

client_class = Client

1903

3033

if use_dbus:

1904

3034

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

1905

def client_config_items(config, section):

1906

special_settings = {

1907

"approved_by_default":

1908

lambda: config.getboolean(section,

1909

"approved_by_default"),

1910

}

1911

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

3035

3036

client_settings = Client.config_parser(client_config)

3037

old_client_settings = {}

3038

clients_data = {}

3039

3040

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

3041

global wnull

3042

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

3043

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

3044

# mode

3045

if debug or not foreground:

3046

wnull.close()

3047

3048

# Get client data and settings from last running state.

3049

if server_settings["restore"]:

3050

try:

3051

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

3052

if sys.version_info.major == 2:

3053

clients_data, old_client_settings = pickle.load(

3054

stored_state)

3055

else:

3056

bytes_clients_data, bytes_old_client_settings = (

3057

pickle.load(stored_state, encoding = "bytes"))

3058

### Fix bytes to strings

3059

## clients_data

3060

# .keys()

3061

clients_data = { (key.decode("utf-8")

3062

if isinstance(key, bytes)

3063

else key): value

3064

for key, value in

3065

bytes_clients_data.items() }

3066

del bytes_clients_data

3067

for key in clients_data:

3068

value = { (k.decode("utf-8")

3069

if isinstance(k, bytes) else k): v

3070

for k, v in

3071

clients_data[key].items() }

3072

clients_data[key] = value

3073

# .client_structure

3074

value["client_structure"] = [

3075

(s.decode("utf-8")

3076

if isinstance(s, bytes)

3077

else s) for s in

3078

value["client_structure"] ]

3079

# .name & .host

3080

for k in ("name", "host"):

3081

if isinstance(value[k], bytes):

3082

value[k] = value[k].decode("utf-8")

3083

## old_client_settings

3084

# .keys()

3085

old_client_settings = {

3086

(key.decode("utf-8")

3087

if isinstance(key, bytes)

3088

else key): value

3089

for key, value in

3090

bytes_old_client_settings.items() }

3091

del bytes_old_client_settings

3092

# .host

3093

for value in old_client_settings.values():

3094

if isinstance(value["host"], bytes):

3095

value["host"] = (value["host"]

3096

.decode("utf-8"))

3097

os.remove(stored_state_path)

3098

except IOError as e:

3099

if e.errno == errno.ENOENT:

3100

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

3101

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

3102

else:

3103

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

3104

exc_info=e)

3105

raise

3106

except EOFError as e:

3107

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

3108

"EOFError:",

3109

exc_info=e)

3110

3111

with PGPEngine() as pgp:

3112

for client_name, client in clients_data.items():

3113

# Skip removed clients

3114

if client_name not in client_settings:

3115

continue

3116

3117

# Decide which value to use after restoring saved state.

3118

# We have three different values: Old config file,

3119

# new config file, and saved state.

3120

# New config value takes precedence if it differs from old

3121

# config value, otherwise use saved state.

3122

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

3123

try:

3124

# For each value in new config, check if it

3125

# differs from the old config value (Except for

3126

# the "secret" attribute)

3127

if (name != "secret"

3128

and (value !=

3129

old_client_settings[client_name][name])):

3130

client[name] = value

3131

except KeyError:

3132

pass

3133

3134

# Clients who has passed its expire date can still be

3135

# enabled if its last checker was successful. A Client

3136

# whose checker succeeded before we stored its state is

3137

# assumed to have successfully run all checkers during

3138

# downtime.

3139

if client["enabled"]:

3140

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

3141

if not client["last_checked_ok"]:

3142

logger.warning(

3143

"disabling client {} - Client never "

3144

"performed a successful checker".format(

3145

client_name))

3146

client["enabled"] = False

3147

elif client["last_checker_status"] != 0:

3148

logger.warning(

3149

"disabling client {} - Client last"

3150

" checker failed with error code"

3151

" {}".format(

3152

client_name,

3153

client["last_checker_status"]))

3154

client["enabled"] = False

3155

else:

3156

client["expires"] = (

3157

datetime.datetime.utcnow()

3158

+ client["timeout"])

3159

logger.debug("Last checker succeeded,"

3160

" keeping {} enabled".format(

3161

client_name))

1912

3162

try:

1913

yield (name, special_settings[name]())

1914

except KeyError:

1915

yield (name, value)

1916

1917

tcp_server.clients.update(set(

1918

client_class(name = section,

1919

config= dict(client_config_items(

1920

client_config, section)))

1921

for section in client_config.sections()))

3163

client["secret"] = pgp.decrypt(

3164

client["encrypted_secret"],

3165

client_settings[client_name]["secret"])

3166

except PGPError:

3167

# If decryption fails, we use secret from new settings

3168

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

3169

client_name))

3170

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

3171

["secret"])

3172

3173

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

3174

for client_name in (set(old_client_settings)

3175

- set(client_settings)):

3176

del clients_data[client_name]

3177

for client_name in (set(client_settings)

3178

- set(old_client_settings)):

3179

clients_data[client_name] = client_settings[client_name]

3180

3181

# Create all client objects

3182

for client_name, client in clients_data.items():

3183

tcp_server.clients[client_name] = client_class(

3184

name = client_name,

3185

settings = client,

3186

server_settings = server_settings)

3187

1922

3188

if not tcp_server.clients:

1923

3189

logger.warning("No clients defined")

1924

1925

if not debug:

1926

try:

1927

with pidfile:

1928

pid = os.getpid()

1929

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

1930

del pidfile

1931

except IOError:

1932

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

1933

pidfilename, pid)

1934

except NameError:

1935

# "pidfile" was never created

1936

pass

3190

3191

if not foreground:

3192

if pidfile is not None:

3193

pid = os.getpid()

3194

try:

3195

with pidfile:

3196

print(pid, file=pidfile)

3197

except IOError:

3198

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

3199

pidfilename, pid)

3200

del pidfile

1937

3201

del pidfilename

3202

3203

for termsig in (signal.SIGHUP, signal.SIGTERM):

3204

GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,

3205

lambda: main_loop.quit() and False)

3206

3207

if use_dbus:

1938

3208

1939

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

1940

1941

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

1942

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

1943

1944

if use_dbus:

1945

class MandosDBusService(dbus.service.Object):

3209

@alternate_dbus_interfaces(

3210

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

3211

class MandosDBusService(DBusObjectWithObjectManager):

1946

3212

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

3213

1947

3214

def __init__(self):

1948

3215

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

1949

_interface = "se.bsnet.fukt.Mandos"

3216

3217

_interface = "se.recompile.Mandos"

1950

3218

1951

3219

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

1952

3220

def ClientAdded(self, objpath):

1958

3226

"D-Bus signal"

1959

3227

pass

1960

3228

3229

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

3230

"true"})

1961

3231

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

1962

3232

def ClientRemoved(self, objpath, name):

1963

3233

"D-Bus signal"

1964

3234

pass

1965

3235

3236

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

3237

"true"})

1966

3238

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

1967

3239

def GetAllClients(self):

1968

3240

"D-Bus method"

1969

return dbus.Array(c.dbus_object_path

1970

for c in tcp_server.clients)

3241

return dbus.Array(c.dbus_object_path for c in

3242

tcp_server.clients.values())

1971

3243

3244

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

3245

"true"})

1972

3246

@dbus.service.method(_interface,

1973

3247

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

1974

3248

def GetAllClientsWithProperties(self):

1975

3249

"D-Bus method"

1976

3250

return dbus.Dictionary(

1977

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

1978

for c in tcp_server.clients),

3251

{ c.dbus_object_path: c.GetAll(

3252

"se.recompile.Mandos.Client")

3253

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

1979

3254

signature="oa{sv}")

1980

3255

1981

3256

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

1982

3257

def RemoveClient(self, object_path):

1983

3258

"D-Bus method"

1984

for c in tcp_server.clients:

3259

for c in tcp_server.clients.values():

1985

3260

if c.dbus_object_path == object_path:

1986

tcp_server.clients.remove(c)

3261

del tcp_server.clients[c.name]

1987

3262

c.remove_from_connection()

1988

# Don't signal anything except ClientRemoved

3263

# Don't signal the disabling

1989

3264

c.disable(quiet=True)

1990

# Emit D-Bus signal

1991

self.ClientRemoved(object_path, c.name)

3265

# Emit D-Bus signal for removal

3266

self.client_removed_signal(c)

1992

3267

return

1993

3268

raise KeyError(object_path)

1994

3269

1995

3270

del _interface

3271

3272

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

3273

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

3274

def GetManagedObjects(self):

3275

"""D-Bus method"""

3276

return dbus.Dictionary(

3277

{ client.dbus_object_path:

3278

dbus.Dictionary(

3279

{ interface: client.GetAll(interface)

3280

for interface in

3281

client._get_all_interface_names()})

3282

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

3283

3284

def client_added_signal(self, client):

3285

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

3286

if use_dbus:

3287

# New standard signal

3288

self.InterfacesAdded(

3289

client.dbus_object_path,

3290

dbus.Dictionary(

3291

{ interface: client.GetAll(interface)

3292

for interface in

3293

client._get_all_interface_names()}))

3294

# Old signal

3295

self.ClientAdded(client.dbus_object_path)

3296

3297

def client_removed_signal(self, client):

3298

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

3299

if use_dbus:

3300

# New standard signal

3301

self.InterfacesRemoved(

3302

client.dbus_object_path,

3303

client._get_all_interface_names())

3304

# Old signal

3305

self.ClientRemoved(client.dbus_object_path,

3306

client.name)

1996

3307

1997

3308

mandos_dbus_service = MandosDBusService()

1998

3309

1999

3310

def cleanup():

2000

3311

"Cleanup function; run on exit"

2001

service.cleanup()

2002

3312

if zeroconf:

3313

service.cleanup()

3314

3315

multiprocessing.active_children()

3316

wnull.close()

3317

if not (tcp_server.clients or client_settings):

3318

return

3319

3320

# Store client before exiting. Secrets are encrypted with key

3321

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

3322

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

3323

clients = {}

3324

with PGPEngine() as pgp:

3325

for client in tcp_server.clients.values():

3326

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

3327

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

3328

key)

3329

client_dict = {}

3330

3331

# A list of attributes that can not be pickled

3332

# + secret.

3333

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

3334

"checker", "server_settings" }

3335

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

3336

.Object):

3337

exclude.add(name)

3338

3339

client_dict["encrypted_secret"] = (client

3340

.encrypted_secret)

3341

for attr in client.client_structure:

3342

if attr not in exclude:

3343

client_dict[attr] = getattr(client, attr)

3344

3345

clients[client.name] = client_dict

3346

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

3347

3348

try:

3349

with tempfile.NamedTemporaryFile(

3350

mode='wb',

3351

suffix=".pickle",

3352

prefix='clients-',

3353

dir=os.path.dirname(stored_state_path),

3354

delete=False) as stored_state:

3355

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

3356

protocol = 2)

3357

tempname = stored_state.name

3358

os.rename(tempname, stored_state_path)

3359

except (IOError, OSError) as e:

3360

if not debug:

3361

try:

3362

os.remove(tempname)

3363

except NameError:

3364

pass

3365

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

3366

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

3367

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

3368

else:

3369

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

3370

exc_info=e)

3371

raise

3372

3373

# Delete all clients, and settings from config

2003

3374

while tcp_server.clients:

2004

client = tcp_server.clients.pop()

3375

name, client = tcp_server.clients.popitem()

2005

3376

if use_dbus:

2006

3377

client.remove_from_connection()

2007

client.disable_hook = None

2008

# Don't signal anything except ClientRemoved

3378

# Don't signal the disabling

2009

3379

client.disable(quiet=True)

3380

# Emit D-Bus signal for removal

2010

3381

if use_dbus:

2011

# Emit D-Bus signal

2012

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2013

client.name)

3382

mandos_dbus_service.client_removed_signal(client)

3383

client_settings.clear()

2014

3384

2015

3385

atexit.register(cleanup)

2016

3386

2017

for client in tcp_server.clients:

3387

for client in tcp_server.clients.values():

2018

3388

if use_dbus:

2019

# Emit D-Bus signal

2020

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2021

client.enable()

3389

# Emit D-Bus signal for adding

3390

mandos_dbus_service.client_added_signal(client)

3391

# Need to initiate checking of clients

3392

if client.enabled:

3393

client.init_checker()

2022

3394

2023

3395

tcp_server.enable()

2024

3396

tcp_server.server_activate()

2025

3397

2026

3398

# Find out what port we got

2027

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

3399

if zeroconf:

3400

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

2028

3401

if use_ipv6:

2029

3402

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

2030

" flowinfo %d, scope_id %d"

2031

% tcp_server.socket.getsockname())

3403

" flowinfo %d, scope_id %d",

3404

*tcp_server.socket.getsockname())

2032

3405

else: # IPv4

2033

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

2034

% tcp_server.socket.getsockname())

3406

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

3407

*tcp_server.socket.getsockname())

2035

3408

2036

3409

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

2037

3410

2038

3411

try:

2039

# From the Avahi example code

2040

try:

2041

service.activate()

2042

except dbus.exceptions.DBusException as error:

2043

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

2044

cleanup()

2045

sys.exit(1)

2046

# End of Avahi example code

3412

if zeroconf:

3413

# From the Avahi example code

3414

try:

3415

service.activate()

3416

except dbus.exceptions.DBusException as error:

3417

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

3418

cleanup()

3419

sys.exit(1)

3420

# End of Avahi example code

2047

3421

2048

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

2049

lambda *args, **kwargs:

2050

(tcp_server.handle_request

2051

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

3422

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

3423

lambda *args, **kwargs:

3424

(tcp_server.handle_request

3425

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

2052

3426

2053

3427

logger.debug("Starting main loop")

2054

3428

main_loop.run()

2055

3429

except AvahiError as error:

2056

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

3430

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

2057

3431

cleanup()

2058

3432

sys.exit(1)

2059

3433

except KeyboardInterrupt: