/mandos/trunk : revision 502.1.1

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

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#

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# Everything else is

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#

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

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

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# along with this program. If not, see

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

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#

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

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

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#

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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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 SocketServer as socketserver

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import socket

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import argparse

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import datetime

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import errno

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try:

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import ConfigParser as configparser

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except ImportError:

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import configparser

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import gnutls.crypto

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import gnutls.connection

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import gnutls.errors

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import gnutls.library.functions

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import gnutls.library.constants

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import gnutls.library.types

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import ConfigParser as configparser

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import sys

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import re

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import os

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import struct

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import fcntl

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import functools

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try:

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import cPickle as pickle

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except ImportError:

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import pickle

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import cPickle as pickle

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import multiprocessing

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import types

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import binascii

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import tempfile

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import itertools

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import collections

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import codecs

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import dbus

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import dbus.service

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from gi.repository import GLib

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import gobject

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import avahi

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from dbus.mainloop.glib import DBusGMainLoop

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import ctypes

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import ctypes.util

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except ImportError:

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SO_BINDTODEVICE = None

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if sys.version_info.major == 2:

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str = unicode

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version = "1.7.6"

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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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version = "1.3.1"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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class AvahiError(Exception):

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

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self.value = value

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

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**kwargs)

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

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def __unicode__(self):

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return unicode(repr(self.value))

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class AvahiServiceError(AvahiError):

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pass

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class AvahiGroupError(AvahiError):

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pass

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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def __init__(self,

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interface = avahi.IF_UNSPEC,

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name = None,

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servicetype = None,

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port = None,

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TXT = None,

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domain = "",

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host = "",

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max_renames = 32768,

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protocol = avahi.PROTO_UNSPEC,

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bus = None):

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

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

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

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protocol = avahi.PROTO_UNSPEC, bus = None):

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self.interface = interface

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self.name = name

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self.type = servicetype

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self, remove=True):

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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

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" after %i retries, exiting.",

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self.rename_count)

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raise AvahiServiceError("Too many renames")

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self.name = str(

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self.server.GetAlternativeServiceName(self.name))

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self.rename_count += 1

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

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

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self.name)

355

if remove:

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self.remove()

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

360

if (error.get_dbus_name()

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

362

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

363

return self.rename(remove=False)

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else:

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

366

self.cleanup()

367

os._exit(1)

368

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

174

self.cleanup()

175

os._exit(1)

176

self.rename_count += 1

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def remove(self):

370

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

371

179

if self.entry_group_state_changed_match is not None:

373

181

self.entry_group_state_changed_match = None

374

182

if self.group is not None:

375

183

self.group.Reset()

376

377

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def add(self):

378

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

379

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self.remove()

384

191

avahi.DBUS_INTERFACE_ENTRY_GROUP)

385

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self.entry_group_state_changed_match = (

386

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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))

388

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

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self.name, self.type)

390

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self.group.AddService(

396

203

dbus.UInt16(self.port),

397

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avahi.string_array_to_txt_array(self.TXT))

398

205

self.group.Commit()

399

400

206

def entry_group_state_changed(self, state, error):

401

207

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

402

208

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

408

214

self.rename()

409

215

elif state == avahi.ENTRY_GROUP_FAILURE:

410

216

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

411

str(error))

412

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

413

217

unicode(error))

218

raise AvahiGroupError("State changed: %s"

219

% unicode(error))

414

220

def cleanup(self):

415

221

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

416

222

if self.group is not None:

417

223

try:

418

224

self.group.Free()

419

225

except (dbus.exceptions.UnknownMethodException,

420

dbus.exceptions.DBusException):

226

dbus.exceptions.DBusException) as e:

421

227

pass

422

228

self.group = None

423

229

self.remove()

424

425

230

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

426

231

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

427

232

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

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

}

233

bad_states = { avahi.SERVER_INVALID:

234

"Zeroconf server invalid",

235

avahi.SERVER_REGISTERING: None,

236

avahi.SERVER_COLLISION:

237

"Zeroconf server name collision",

238

avahi.SERVER_FAILURE:

239

"Zeroconf server failure" }

434

240

if state in bad_states:

435

241

if bad_states[state] is not None:

436

242

if error is None:

439

245

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

440

246

self.cleanup()

441

247

elif state == avahi.SERVER_RUNNING:

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)

248

self.add()

454

249

else:

455

250

if error is None:

456

251

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

457

252

else:

458

253

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

459

460

254

def activate(self):

461

255

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

462

256

if self.server is None:

466

260

follow_name_owner_changes=True),

467

261

avahi.DBUS_INTERFACE_SERVER)

468

262

self.server.connect_to_signal("StateChanged",

469

self.server_state_changed)

263

self.server_state_changed)

470

264

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

471

265

472

266

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

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

747

273

class Client(object):

748

274

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

749

275

750

276

Attributes:

751

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

277

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

752

278

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

753

279

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

754

280

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

755

281

to see if the client lives.

756

282

'None' if no process is running.

757

checker_callback_tag: a GLib event source tag, or None

283

checker_callback_tag: a gobject event source tag, or None

758

284

checker_command: string; External command which is run to check

759

285

if client lives. %() expansions are done at

760

286

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

761

287

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

762

checker_initiator_tag: a GLib event source tag, or None

288

checker_initiator_tag: a gobject event source tag, or None

763

289

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

766

290

current_checker_command: string; current running checker_command

767

disable_initiator_tag: a GLib event source tag, or None

291

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

292

disable_initiator_tag: a gobject event source tag, or None

768

293

enabled: bool()

769

294

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

770

295

uniquely identify the client

772

297

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

773

298

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

774

299

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

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

300

last_enabled: datetime.datetime(); (UTC)

781

301

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

782

302

D-Bus identifiers

783

303

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

784

304

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

785

305

until this client is disabled

786

extended_timeout: extra long timeout when secret has been sent

306

extended_timeout: extra long timeout when password has been sent

787

307

runtime_expansions: Allowed attributes for runtime expansion.

788

308

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

789

309

disabled, or None

790

server_settings: The server_settings dict from main()

791

310

"""

792

311

793

312

runtime_expansions = ("approval_delay", "approval_duration",

794

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

795

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

796

"last_approval_request", "last_checked_ok",

313

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

314

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

797

315

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

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):

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."""

863

336

self.name = name

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

337

if config is None:

338

config = {}

881

339

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(" ", ""))

882

345

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

883

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

884

datetime.datetime.utcnow())

885

886

# attributes specific for this server instance

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

887

366

self.checker = None

888

367

self.checker_initiator_tag = None

889

368

self.disable_initiator_tag = None

369

self.expires = None

890

370

self.checker_callback_tag = None

371

self.checker_command = config["checker"]

891

372

self.current_checker_command = None

892

self.approved = None

373

self.last_connect = None

374

self._approved = None

375

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

376

True)

893

377

self.approvals_pending = 0

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)

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())

905

383

906

# Send notice to process children that client state has changed

907

384

def send_changedstate(self):

908

with self.changedstate:

909

self.changedstate.notify_all()

910

385

self.changedstate.acquire()

386

self.changedstate.notify_all()

387

self.changedstate.release()

388

911

389

def enable(self):

912

390

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

913

391

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

914

392

# Already enabled

915

393

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

916

401

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

402

self.disable_initiator_tag = (gobject.timeout_add

403

(self.timeout_milliseconds(),

404

self.disable))

917

405

self.enabled = True

918

406

self.last_enabled = datetime.datetime.utcnow()

919

self.init_checker()

920

self.send_changedstate()

407

# Also start a new checker *right now*.

408

self.start_checker()

921

409

922

410

def disable(self, quiet=True):

923

411

"""Disable this client."""

924

412

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

925

413

return False

926

414

if not quiet:

415

self.send_changedstate()

416

if not quiet:

927

417

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

928

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

929

GLib.source_remove(self.disable_initiator_tag)

418

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

419

gobject.source_remove(self.disable_initiator_tag)

930

420

self.disable_initiator_tag = None

931

421

self.expires = None

932

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

933

GLib.source_remove(self.checker_initiator_tag)

422

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

423

gobject.source_remove(self.checker_initiator_tag)

934

424

self.checker_initiator_tag = None

935

425

self.stop_checker()

426

if self.disable_hook:

427

self.disable_hook(self)

936

428

self.enabled = False

937

if not quiet:

938

self.send_changedstate()

939

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

429

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

940

430

return False

941

431

942

432

def __del__(self):

433

self.disable_hook = None

943

434

self.disable()

944

435

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):

436

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

963

437

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

964

438

self.checker_callback_tag = None

965

439

self.checker = None

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:

440

if os.WIFEXITED(condition):

441

exitstatus = os.WEXITSTATUS(condition)

442

if exitstatus == 0:

974

443

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

975

444

vars(self))

976

445

self.checked_ok()

977

446

else:

978

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

447

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

448

vars(self))

979

449

else:

980

self.last_checker_status = -1

981

self.last_checker_signal = -returncode

982

450

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

983

451

vars(self))

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."""

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

"""

995

459

if timeout is None:

996

460

timeout = self.timeout

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

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))

1004

467

1005

468

def need_approval(self):

1006

469

self.last_approval_request = datetime.datetime.utcnow()

1011

474

If a checker already exists, leave it running and do

1012

475

nothing."""

1013

476

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

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

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

1018

481

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

1019

482

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

1020

483

# should be.

1021

484

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

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)

1026

498

# Start a new checker if needed

1027

499

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 }

1032

500

try:

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

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

1039

519

self.current_checker_command = command

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

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

1066

544

return True

1067

545

1068

546

def stop_checker(self):

1069

547

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

1070

548

if self.checker_callback_tag:

1071

GLib.source_remove(self.checker_callback_tag)

549

gobject.source_remove(self.checker_callback_tag)

1072

550

self.checker_callback_tag = None

1073

551

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

1074

552

return

1075

553

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

1076

self.checker.terminate()

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

1077

562

self.checker = None

1078

563

1079

564

1080

def dbus_service_property(dbus_interface,

1081

signature="v",

1082

access="readwrite",

1083

byte_arrays=False):

565

def dbus_service_property(dbus_interface, signature="v",

566

access="readwrite", byte_arrays=False):

1084

567

"""Decorators for marking methods of a DBusObjectWithProperties to

1085

568

become properties on the D-Bus.

1086

569

1095

578

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

1096

579

if byte_arrays and signature != "ay":

1097

580

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

1098

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

1099

581

" signature %r" % signature)

1100

582

def decorator(func):

1101

583

func._dbus_is_property = True

1102

584

func._dbus_interface = dbus_interface

1107

589

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

1108

590

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

1109

591

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

1154

592

return decorator

1155

593

1156

594

1157

595

class DBusPropertyException(dbus.exceptions.DBusException):

1158

596

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

1159

597

"""

1160

pass

598

def __unicode__(self):

599

return unicode(str(self))

1161

600

1162

601

1163

602

class DBusPropertyAccessException(DBusPropertyException):

1172

611

pass

1173

612

1174

613

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):

614

class DBusObjectWithProperties(dbus.service.Object):

1265

615

"""A D-Bus object with properties.

1266

616

1267

617

Classes inheriting from this can use the dbus_service_property

1269

619

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

1270

620

"""

1271

621

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

1272

633

def _get_dbus_property(self, interface_name, property_name):

1273

634

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

1274

635

property with the specified name and interface.

1275

636

"""

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

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

1283

647

# No such property

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",

648

raise DBusPropertyNotFound(self.dbus_object_path + ":"

649

+ interface_name + "."

650

+ property_name)

651

652

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

1298

653

out_signature="v")

1299

654

def Get(self, interface_name, property_name):

1300

655

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

1318

673

# The byte_arrays option is not supported yet on

1319

674

# signatures other than "ay".

1320

675

if prop._dbus_signature != "ay":

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))

676

raise ValueError

677

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

678

for byte in value))

1326

679

prop(value)

1327

680

1328

@dbus.service.method(dbus.PROPERTIES_IFACE,

1329

in_signature="s",

681

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

1330

682

out_signature="a{sv}")

1331

683

def GetAll(self, interface_name):

1332

684

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

1334

686

1335

687

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

1336

688

"""

1337

properties = {}

1338

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

689

all = {}

690

for name, prop in self._get_all_dbus_properties():

1339

691

if (interface_name

1340

692

and interface_name != prop._dbus_interface):

1341

693

# Interface non-empty but did not match

1345

697

continue

1346

698

value = prop()

1347

699

if not hasattr(value, "variant_level"):

1348

properties[name] = value

700

all[name] = value

1349

701

continue

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

702

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

703

value.variant_level+1)

704

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

1361

705

1362

706

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1363

707

out_signature="s",

1364

708

path_keyword='object_path',

1365

709

connection_keyword='connection')

1366

710

def Introspect(self, object_path, connection):

1367

"""Overloading of standard D-Bus method.

1368

1369

Inserts property tags and interface annotation tags.

711

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

1370

712

"""

1371

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1372

object_path,

1373

connection)

713

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

714

connection)

1374

715

try:

1375

716

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

1376

1377

717

def make_tag(document, name, prop):

1378

718

e = document.createElement("property")

1379

719

e.setAttribute("name", name)

1380

720

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

1381

721

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

1382

722

return e

1383

1384

723

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

1385

# Add property tags

1386

724

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

1387

725

for name, prop

1388

in self._get_all_dbus_things("property")

726

in self._get_all_dbus_properties()

1389

727

if prop._dbus_interface

1390

728

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

1391

729

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)

1408

730

# Add the names to the return values for the

1409

731

# "org.freedesktop.DBus.Properties" methods

1410

732

if (if_tag.getAttribute("name")

1425

747

except (AttributeError, xml.dom.DOMException,

1426

748

xml.parsers.expat.ExpatError) as error:

1427

749

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

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):

750

error)

751

return xmlstring

752

753

754

def datetime_to_dbus (dt, variant_level=0):

1501

755

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

1502

756

if dt is None:

1503

757

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

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"})

758

return dbus.String(dt.isoformat(),

759

variant_level=variant_level)

760

761

1676

762

class ClientDBus(Client, DBusObjectWithProperties):

1677

763

"""A Client class using D-Bus

1678

764

1682

768

"""

1683

769

1684

770

runtime_expansions = (Client.runtime_expansions

1685

+ ("dbus_object_path", ))

1686

1687

_interface = "se.recompile.Mandos.Client"

771

+ ("dbus_object_path",))

1688

772

1689

773

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

1690

774

1691

775

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

776

self._approvals_pending = 0

1692

777

self.bus = bus

1693

778

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

1694

779

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

1695

780

# the D-Bus

1696

client_object_name = str(self.name).translate(

781

client_object_name = unicode(self.name).translate(

1697

782

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

1698

783

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

1699

self.dbus_object_path = dbus.ObjectPath(

1700

"/clients/" + client_object_name)

784

self.dbus_object_path = (dbus.ObjectPath

785

("/clients/" + client_object_name))

1701

786

DBusObjectWithProperties.__init__(self, self.bus,

1702

787

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.

1711

788

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

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

1715

797

type_func: Function that transform the value before sending it

1716

to the D-Bus. Default: no transform

1717

variant_level: D-Bus variant level. Default: 1

798

to DBus

799

variant_level: DBus variant level. default: 1

1718

800

"""

1719

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

1720

801

real_value = [None,]

1721

802

def setter(self, value):

803

old_value = real_value[0]

804

real_value[0] = value

1722

805

if hasattr(self, "dbus_object_path"):

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)

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)

1742

811

1743

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

812

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

813

1744

814

1745

815

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1746

816

approvals_pending = notifychangeproperty(dbus.Boolean,

1749

819

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

1750

820

last_enabled = notifychangeproperty(datetime_to_dbus,

1751

821

"LastEnabled")

1752

checker = notifychangeproperty(

1753

dbus.Boolean, "CheckerRunning",

1754

type_func = lambda checker: checker is not None)

822

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

823

type_func = lambda checker: checker is not None)

1755

824

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1756

825

"LastCheckedOK")

1757

last_checker_status = notifychangeproperty(dbus.Int16,

1758

"LastCheckerStatus")

1759

last_approval_request = notifychangeproperty(

1760

datetime_to_dbus, "LastApprovalRequest")

826

last_approval_request = notifychangeproperty(datetime_to_dbus,

827

"LastApprovalRequest")

1761

828

approved_by_default = notifychangeproperty(dbus.Boolean,

1762

829

"ApprovedByDefault")

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)

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)

1769

834

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

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)

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)

1779

841

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

1780

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

1781

invalidate_only=True)

1782

842

1783

843

del notifychangeproperty

1784

844

1791

851

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

1792

852

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

1793

853

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:

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)

1801

860

# Emit D-Bus signal

1802

861

self.CheckerCompleted(dbus.Int16(exitstatus),

1803

# This is specific to GNU libC

1804

dbus.Int64(exitstatus << 8),

862

dbus.Int64(condition),

1805

863

dbus.String(command))

1806

864

else:

1807

865

# Emit D-Bus signal

1808

866

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

1809

dbus.Int64(

1810

# This is specific to GNU libC

1811

(exitstatus << 8)

1812

| self.last_checker_signal),

867

dbus.Int64(condition),

1813

868

dbus.String(command))

1814

return ret

869

870

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

871

*args, **kwargs)

1815

872

1816

873

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

1817

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

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

1818

879

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

1819

880

# Only if new checker process was started

1820

881

if (self.checker is not None

1824

885

return r

1825

886

1826

887

def _reset_approved(self):

1827

self.approved = None

888

self._approved = None

1828

889

return False

1829

890

1830

891

def approve(self, value=True):

1831

self.approved = value

1832

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

1833

* 1000), self._reset_approved)

1834

892

self.send_changedstate()

893

self._approved = value

894

gobject.timeout_add(_timedelta_to_milliseconds

895

(self.approval_duration),

896

self._reset_approved)

897

1835

898

1836

899

## D-Bus methods, signals & properties

1837

1838

## Interfaces

900

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

1839

901

1840

902

## Signals

1841

903

1852

914

pass

1853

915

1854

916

# PropertyChanged - signal

1855

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

1856

917

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

1857

918

def PropertyChanged(self, property, value):

1858

919

"D-Bus signal"

1892

953

self.checked_ok()

1893

954

1894

955

# Enable - method

1895

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

1896

956

@dbus.service.method(_interface)

1897

957

def Enable(self):

1898

958

"D-Bus method"

1899

959

self.enable()

1900

960

1901

961

# StartChecker - method

1902

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

1903

962

@dbus.service.method(_interface)

1904

963

def StartChecker(self):

1905

964

"D-Bus method"

1906

965

self.start_checker()

1907

966

1908

967

# Disable - method

1909

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

1910

968

@dbus.service.method(_interface)

1911

969

def Disable(self):

1912

970

"D-Bus method"

1913

971

self.disable()

1914

972

1915

973

# StopChecker - method

1916

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

1917

974

@dbus.service.method(_interface)

1918

975

def StopChecker(self):

1919

976

self.stop_checker()

1926

983

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

1927

984

1928

985

# ApprovedByDefault - property

1929

@dbus_service_property(_interface,

1930

signature="b",

986

@dbus_service_property(_interface, signature="b",

1931

987

access="readwrite")

1932

988

def ApprovedByDefault_dbus_property(self, value=None):

1933

989

if value is None: # get

1935

991

self.approved_by_default = bool(value)

1936

992

1937

993

# ApprovalDelay - property

1938

@dbus_service_property(_interface,

1939

signature="t",

994

@dbus_service_property(_interface, signature="t",

1940

995

access="readwrite")

1941

996

def ApprovalDelay_dbus_property(self, value=None):

1942

997

if value is None: # get

1943

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

1944

* 1000)

998

return dbus.UInt64(self.approval_delay_milliseconds())

1945

999

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

1946

1000

1947

1001

# ApprovalDuration - property

1948

@dbus_service_property(_interface,

1949

signature="t",

1002

@dbus_service_property(_interface, signature="t",

1950

1003

access="readwrite")

1951

1004

def ApprovalDuration_dbus_property(self, value=None):

1952

1005

if value is None: # get

1953

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

1954

* 1000)

1006

return dbus.UInt64(_timedelta_to_milliseconds(

1007

self.approval_duration))

1955

1008

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

1956

1009

1957

1010

# Name - property

1958

@dbus_annotations(

1959

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

1960

1011

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

1961

1012

def Name_dbus_property(self):

1962

1013

return dbus.String(self.name)

1963

1014

1964

1015

# Fingerprint - property

1965

@dbus_annotations(

1966

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

1967

1016

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

1968

1017

def Fingerprint_dbus_property(self):

1969

1018

return dbus.String(self.fingerprint)

1970

1019

1971

1020

# Host - property

1972

@dbus_service_property(_interface,

1973

signature="s",

1021

@dbus_service_property(_interface, signature="s",

1974

1022

access="readwrite")

1975

1023

def Host_dbus_property(self, value=None):

1976

1024

if value is None: # get

1977

1025

return dbus.String(self.host)

1978

self.host = str(value)

1026

self.host = value

1979

1027

1980

1028

# Created - property

1981

@dbus_annotations(

1982

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

1983

1029

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

1984

1030

def Created_dbus_property(self):

1985

return datetime_to_dbus(self.created)

1031

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

1986

1032

1987

1033

# LastEnabled - property

1988

1034

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

1990

1036

return datetime_to_dbus(self.last_enabled)

1991

1037

1992

1038

# Enabled - property

1993

@dbus_service_property(_interface,

1994

signature="b",

1039

@dbus_service_property(_interface, signature="b",

1995

1040

access="readwrite")

1996

1041

def Enabled_dbus_property(self, value=None):

1997

1042

if value is None: # get

2002

1047

self.disable()

2003

1048

2004

1049

# LastCheckedOK - property

2005

@dbus_service_property(_interface,

2006

signature="s",

1050

@dbus_service_property(_interface, signature="s",

2007

1051

access="readwrite")

2008

1052

def LastCheckedOK_dbus_property(self, value=None):

2009

1053

if value is not None:

2011

1055

return

2012

1056

return datetime_to_dbus(self.last_checked_ok)

2013

1057

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

2019

1058

# Expires - property

2020

1059

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

2021

1060

def Expires_dbus_property(self):

2027

1066

return datetime_to_dbus(self.last_approval_request)

2028

1067

2029

1068

# Timeout - property

2030

@dbus_service_property(_interface,

2031

signature="t",

1069

@dbus_service_property(_interface, signature="t",

2032

1070

access="readwrite")

2033

1071

def Timeout_dbus_property(self, value=None):

2034

1072

if value is None: # get

2035

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

2036

old_timeout = self.timeout

1073

return dbus.UInt64(self.timeout_milliseconds())

2037

1074

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

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)

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))

2053

1095

2054

1096

# ExtendedTimeout - property

2055

@dbus_service_property(_interface,

2056

signature="t",

1097

@dbus_service_property(_interface, signature="t",

2057

1098

access="readwrite")

2058

1099

def ExtendedTimeout_dbus_property(self, value=None):

2059

1100

if value is None: # get

2060

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

2061

* 1000)

1101

return dbus.UInt64(self.extended_timeout_milliseconds())

2062

1102

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

2063

1103

2064

1104

# Interval - property

2065

@dbus_service_property(_interface,

2066

signature="t",

1105

@dbus_service_property(_interface, signature="t",

2067

1106

access="readwrite")

2068

1107

def Interval_dbus_property(self, value=None):

2069

1108

if value is None: # get

2070

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

1109

return dbus.UInt64(self.interval_milliseconds())

2071

1110

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

2072

1111

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

2073

1112

return

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

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

2080

1118

2081

1119

# Checker - property

2082

@dbus_service_property(_interface,

2083

signature="s",

1120

@dbus_service_property(_interface, signature="s",

2084

1121

access="readwrite")

2085

1122

def Checker_dbus_property(self, value=None):

2086

1123

if value is None: # get

2087

1124

return dbus.String(self.checker_command)

2088

self.checker_command = str(value)

1125

self.checker_command = value

2089

1126

2090

1127

# CheckerRunning - property

2091

@dbus_service_property(_interface,

2092

signature="b",

1128

@dbus_service_property(_interface, signature="b",

2093

1129

access="readwrite")

2094

1130

def CheckerRunning_dbus_property(self, value=None):

2095

1131

if value is None: # get

2100

1136

self.stop_checker()

2101

1137

2102

1138

# ObjectPath - property

2103

@dbus_annotations(

2104

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

2105

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

2106

1139

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

2107

1140

def ObjectPath_dbus_property(self):

2108

1141

return self.dbus_object_path # is already a dbus.ObjectPath

2109

1142

2110

1143

# Secret = property

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)

1144

@dbus_service_property(_interface, signature="ay",

1145

access="write", byte_arrays=True)

2118

1146

def Secret_dbus_property(self, value):

2119

self.secret = bytes(value)

1147

self.secret = str(value)

2120

1148

2121

1149

del _interface

2122

1150

2126

1154

self._pipe = child_pipe

2127

1155

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

2128

1156

if not self._pipe.recv():

2129

raise KeyError(fpr)

1157

raise KeyError()

2130

1158

2131

1159

def __getattribute__(self, name):

2132

if name == '_pipe':

1160

if(name == '_pipe'):

2133

1161

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

2134

1162

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

2135

1163

data = self._pipe.recv()

2136

1164

if data[0] == 'data':

2137

1165

return data[1]

2138

1166

if data[0] == 'function':

2139

2140

1167

def func(*args, **kwargs):

2141

1168

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

2142

1169

return self._pipe.recv()[1]

2143

2144

1170

return func

2145

1171

2146

1172

def __setattr__(self, name, value):

2147

if name == '_pipe':

1173

if(name == '_pipe'):

2148

1174

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

2149

1175

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

2150

1176

2158

1184

def handle(self):

2159

1185

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

2160

1186

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

2161

str(self.client_address))

1187

unicode(self.client_address))

2162

1188

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

2163

1189

self.server.child_pipe.fileno())

2164

1190

2165

session = gnutls.ClientSession(self.request)

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.

2166

1200

2167

1201

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

2168

1202

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

2172

1206

priority = self.server.gnutls_priority

2173

1207

if priority is None:

2174

1208

priority = "NORMAL"

2175

gnutls.priority_set_direct(session._c_object, priority,

2176

None)

1209

(gnutls.library.functions

1210

.gnutls_priority_set_direct(session._c_object,

1211

priority, None))

2177

1212

2178

1213

# Start communication using the Mandos protocol

2179

1214

# Get protocol number

2181

1216

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

2182

1217

try:

2183

1218

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

2184

raise RuntimeError(line)

1219

raise RuntimeError

2185

1220

except (ValueError, IndexError, RuntimeError) as error:

2186

1221

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

2187

1222

return

2189

1224

# Start GnuTLS connection

2190

1225

try:

2191

1226

session.handshake()

2192

except gnutls.Error as error:

1227

except gnutls.errors.GNUTLSError as error:

2193

1228

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

2194

1229

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

2195

1230

# established. Just abandon the request.

2199

1234

approval_required = False

2200

1235

try:

2201

1236

try:

2202

fpr = self.fingerprint(

2203

self.peer_certificate(session))

2204

except (TypeError, gnutls.Error) as error:

1237

fpr = self.fingerprint(self.peer_certificate

1238

(session))

1239

except (TypeError,

1240

gnutls.errors.GNUTLSError) as error:

2205

1241

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

2206

1242

return

2207

1243

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

2220

1256

while True:

2221

1257

if not client.enabled:

2222

1258

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

2223

client.name)

1259

client.name)

2224

1260

if self.server.use_dbus:

2225

1261

# Emit D-Bus signal

2226

client.Rejected("Disabled")

1262

client.Rejected("Disabled")

2227

1263

return

2228

1264

2229

if client.approved or not client.approval_delay:

1265

if client._approved or not client.approval_delay:

2230

1266

#We are approved or approval is disabled

2231

1267

break

2232

elif client.approved is None:

1268

elif client._approved is None:

2233

1269

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

2234

1270

client.name)

2235

1271

if self.server.use_dbus:

2236

1272

# Emit D-Bus signal

2237

1273

client.NeedApproval(

2238

client.approval_delay.total_seconds()

2239

* 1000, client.approved_by_default)

1274

client.approval_delay_milliseconds(),

1275

client.approved_by_default)

2240

1276

else:

2241

1277

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

2242

1278

client.name)

2246

1282

return

2247

1283

2248

1284

#wait until timeout or approved

1285

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

2249

1286

time = datetime.datetime.now()

2250

1287

client.changedstate.acquire()

2251

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

1288

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

2252

1289

client.changedstate.release()

2253

1290

time2 = datetime.datetime.now()

2254

1291

if (time2 - time) >= delay:

2265

1302

else:

2266

1303

delay -= time2 - time

2267

1304

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

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

2274

1316

2275

1317

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

2276

# bump the timeout using extended_timeout

2277

client.bump_timeout(client.extended_timeout)

1318

# bump the timeout as if seen

1319

client.checked_ok(client.extended_timeout)

2278

1320

if self.server.use_dbus:

2279

1321

# Emit D-Bus signal

2280

1322

client.GotSecret()

2284

1326

client.approvals_pending -= 1

2285

1327

try:

2286

1328

session.bye()

2287

except gnutls.Error as error:

2288

logger.warning("GnuTLS bye failed",

2289

exc_info=error)

1329

except gnutls.errors.GNUTLSError as error:

1330

logger.warning("GnuTLS bye failed")

2290

1331

2291

1332

@staticmethod

2292

1333

def peer_certificate(session):

2293

1334

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

2294

1335

# If not an OpenPGP certificate...

2295

if (gnutls.certificate_type_get(session._c_object)

2296

!= gnutls.CRT_OPENPGP):

2297

# ...return invalid data

2298

return b""

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

2299

1341

list_size = ctypes.c_uint(1)

2300

cert_list = (gnutls.certificate_get_peers

1342

cert_list = (gnutls.library.functions

1343

.gnutls_certificate_get_peers

2301

1344

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

2302

1345

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

2303

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

1346

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

1347

" certificate")

2304

1348

if list_size.value == 0:

2305

1349

return None

2306

1350

cert = cert_list[0]

2310

1354

def fingerprint(openpgp):

2311

1355

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

2312

1356

# New GnuTLS "datum" with the OpenPGP public key

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)))

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))))

2317

1362

# New empty GnuTLS certificate

2318

crt = gnutls.openpgp_crt_t()

2319

gnutls.openpgp_crt_init(ctypes.byref(crt))

1363

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1364

(gnutls.library.functions

1365

.gnutls_openpgp_crt_init(ctypes.byref(crt)))

2320

1366

# Import the OpenPGP public key into the certificate

2321

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

2322

gnutls.OPENPGP_FMT_RAW)

1367

(gnutls.library.functions

1368

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

1369

gnutls.library.constants

1370

.GNUTLS_OPENPGP_FMT_RAW))

2323

1371

# Verify the self signature in the key

2324

1372

crtverify = ctypes.c_uint()

2325

gnutls.openpgp_crt_verify_self(crt, 0,

2326

ctypes.byref(crtverify))

1373

(gnutls.library.functions

1374

.gnutls_openpgp_crt_verify_self(crt, 0,

1375

ctypes.byref(crtverify)))

2327

1376

if crtverify.value != 0:

2328

gnutls.openpgp_crt_deinit(crt)

2329

raise gnutls.CertificateSecurityError("Verify failed")

1377

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1378

raise (gnutls.errors.CertificateSecurityError

1379

("Verify failed"))

2330

1380

# New buffer for the fingerprint

2331

1381

buf = ctypes.create_string_buffer(20)

2332

1382

buf_len = ctypes.c_size_t()

2333

1383

# Get the fingerprint from the certificate into the buffer

2334

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

2335

ctypes.byref(buf_len))

1384

(gnutls.library.functions

1385

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

1386

ctypes.byref(buf_len)))

2336

1387

# Deinit the certificate

2337

gnutls.openpgp_crt_deinit(crt)

1388

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2338

1389

# Convert the buffer to a Python bytestring

2339

1390

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

2340

1391

# Convert the bytestring to hexadecimal notation

2341

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

1392

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

2342

1393

return hex_fpr

2343

1394

2344

1395

2345

1396

class MultiprocessingMixIn(object):

2346

1397

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

2347

2348

1398

def sub_process_main(self, request, address):

2349

1399

try:

2350

1400

self.finish_request(request, address)

2351

except Exception:

1401

except:

2352

1402

self.handle_error(request, address)

2353

1403

self.close_request(request)

2354

1404

2355

1405

def process_request(self, request, address):

2356

1406

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

2357

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

2358

args = (request, address))

2359

proc.start()

2360

return proc

1407

multiprocessing.Process(target = self.sub_process_main,

1408

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

2361

1409

2362

1410

2363

1411

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

2364

1412

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

2365

2366

1413

def process_request(self, request, client_address):

2367

1414

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

2368

1415

2370

1417

"""

2371

1418

parent_pipe, self.child_pipe = multiprocessing.Pipe()

2372

1419

2373

proc = MultiprocessingMixIn.process_request(self, request,

2374

client_address)

1420

super(MultiprocessingMixInWithPipe,

1421

self).process_request(request, client_address)

2375

1422

self.child_pipe.close()

2376

self.add_pipe(parent_pipe, proc)

1423

self.add_pipe(parent_pipe)

2377

1424

2378

def add_pipe(self, parent_pipe, proc):

1425

def add_pipe(self, parent_pipe):

2379

1426

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

2380

raise NotImplementedError()

1427

raise NotImplementedError

2381

1428

2382

1429

2383

1430

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

2389

1436

interface: None or a network interface name (string)

2390

1437

use_ipv6: Boolean; to use IPv6 or not

2391

1438

"""

2392

2393

1439

def __init__(self, server_address, RequestHandlerClass,

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

"""

1440

interface=None, use_ipv6=True):

2400

1441

self.interface = interface

2401

1442

if use_ipv6:

2402

1443

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.

2429

1444

socketserver.TCPServer.__init__(self, server_address,

2430

1445

RequestHandlerClass)

2431

2432

1446

def server_bind(self):

2433

1447

"""This overrides the normal server_bind() function

2434

1448

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

2440

1454

self.interface)

2441

1455

else:

2442

1456

try:

2443

self.socket.setsockopt(

2444

socket.SOL_SOCKET, SO_BINDTODEVICE,

2445

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

1457

self.socket.setsockopt(socket.SOL_SOCKET,

1458

SO_BINDTODEVICE,

1459

str(self.interface

1460

+ '\0'))

2446

1461

except socket.error as error:

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:

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:

2451

1467

logger.error("SO_BINDTODEVICE not available;"

2452

1468

" cannot bind to interface %s",

2453

1469

self.interface)

2454

elif error.errno == errno.ENODEV:

2455

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

2456

" cannot bind", self.interface)

2457

1470

else:

2458

1471

raise

2459

1472

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

2462

1475

if self.address_family == socket.AF_INET6:

2463

1476

any_address = "::" # in6addr_any

2464

1477

else:

2465

any_address = "0.0.0.0" # INADDR_ANY

1478

any_address = socket.INADDR_ANY

2466

1479

self.server_address = (any_address,

2467

1480

self.server_address[1])

2468

1481

elif not self.server_address[1]:

2469

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

1482

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

1483

0)

2470

1484

# if self.interface:

2471

1485

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

2472

1486

# 0, # port

2484

1498

gnutls_priority GnuTLS priority string

2485

1499

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

2486

1500

2487

Assumes a GLib.MainLoop event loop.

1501

Assumes a gobject.MainLoop event loop.

2488

1502

"""

2489

2490

1503

def __init__(self, server_address, RequestHandlerClass,

2491

interface=None,

2492

use_ipv6=True,

2493

clients=None,

2494

gnutls_priority=None,

2495

use_dbus=True,

2496

socketfd=None):

1504

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

1505

gnutls_priority=None, use_dbus=True):

2497

1506

self.enabled = False

2498

1507

self.clients = clients

2499

1508

if self.clients is None:

2500

self.clients = {}

1509

self.clients = set()

2501

1510

self.use_dbus = use_dbus

2502

1511

self.gnutls_priority = gnutls_priority

2503

1512

IPv6_TCPServer.__init__(self, server_address,

2504

1513

RequestHandlerClass,

2505

1514

interface = interface,

2506

use_ipv6 = use_ipv6,

2507

socketfd = socketfd)

2508

1515

use_ipv6 = use_ipv6)

2509

1516

def server_activate(self):

2510

1517

if self.enabled:

2511

1518

return socketserver.TCPServer.server_activate(self)

2512

2513

1519

def enable(self):

2514

1520

self.enabled = True

2515

2516

def add_pipe(self, parent_pipe, proc):

1521

def add_pipe(self, parent_pipe):

2517

1522

# Call "handle_ipc" for both data and EOF events

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,

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,

2528

1529

client_object=None):

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()

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):

2533

1546

return False

2534

1547

2535

1548

# Read a request from the child

2540

1553

fpr = request[1]

2541

1554

address = request[2]

2542

1555

2543

for c in self.clients.values():

1556

for c in self.clients:

2544

1557

if c.fingerprint == fpr:

2545

1558

client = c

2546

1559

break

2549

1562

"dress: %s", fpr, address)

2550

1563

if self.use_dbus:

2551

1564

# Emit D-Bus signal

2552

mandos_dbus_service.ClientNotFound(fpr,

2553

address[0])

1565

mandos_dbus_service.ClientNotFound(fpr, address[0])

2554

1566

parent_pipe.send(False)

2555

1567

return False

2556

1568

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))

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))

2564

1574

parent_pipe.send(True)

2565

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

2566

# same fileno

1575

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

2567

1576

return False

2568

1577

if command == 'funcall':

2569

1578

funcname = request[1]

2570

1579

args = request[2]

2571

1580

kwargs = request[3]

2572

1581

2573

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

2574

funcname)(*args,

2575

**kwargs)))

1582

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

2576

1583

2577

1584

if command == 'getattr':

2578

1585

attrname = request[1]

2579

if isinstance(client_object.__getattribute__(attrname),

2580

collections.Callable):

2581

parent_pipe.send(('function', ))

1586

if callable(client_object.__getattribute__(attrname)):

1587

parent_pipe.send(('function',))

2582

1588

else:

2583

parent_pipe.send((

2584

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

1589

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

2585

1590

2586

1591

if command == 'setattr':

2587

1592

attrname = request[1]

2591

1596

return True

2592

1597

2593

1598

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

2690

1599

def string_to_delta(interval):

2691

1600

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

2692

1601

2703

1612

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

2704

1613

datetime.timedelta(0, 330)

2705

1614

"""

2706

2707

try:

2708

return rfc3339_duration_to_delta(interval)

2709

except ValueError:

2710

pass

2711

2712

1615

timevalue = datetime.timedelta(0)

2713

1616

for s in interval.split():

2714

1617

try:

2715

suffix = s[-1]

1618

suffix = unicode(s[-1])

2716

1619

value = int(s[:-1])

2717

1620

if suffix == "d":

2718

1621

delta = datetime.timedelta(value)

2725

1628

elif suffix == "w":

2726

1629

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

2727

1630

else:

2728

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

2729

except IndexError as e:

1631

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

1632

except (ValueError, IndexError) as e:

2730

1633

raise ValueError(*(e.args))

2731

1634

timevalue += delta

2732

1635

return timevalue

2733

1636

2734

1637

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

2735

1662

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

2736

1663

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

2737

1664

2745

1672

sys.exit()

2746

1673

if not noclose:

2747

1674

# Close all standard open file descriptors

2748

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

1675

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

2749

1676

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

2750

1677

raise OSError(errno.ENODEV,

2751

"{} not a character device"

2752

.format(os.devnull))

1678

"%s not a character device"

1679

% os.path.devnull)

2753

1680

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

2754

1681

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

2755

1682

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

2764

1691

2765

1692

parser = argparse.ArgumentParser()

2766

1693

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

2767

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

1694

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

2768

1695

help="show version number and exit")

2769

1696

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

2770

1697

help="Bind to interface IF")

2776

1703

help="Run self-test")

2777

1704

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

2778

1705

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

2779

" to terminal", default=None)

1706

" to terminal")

2780

1707

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

2781

1708

help="Debug level for stdout output")

2782

1709

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

2789

1716

" files")

2790

1717

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

2791

1718

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

2792

" system bus interface", default=None)

1719

" system bus interface")

2793

1720

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

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

1721

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

2810

1722

options = parser.parse_args()

2811

1723

2812

1724

if options.check:

2813

1725

import doctest

2814

fail_count, test_count = doctest.testmod()

2815

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

1726

doctest.testmod()

1727

sys.exit()

2816

1728

2817

1729

# Default values for config file for server-global settings

2818

1730

server_defaults = { "interface": "",

2820

1732

"port": "",

2821

1733

"debug": "False",

2822

1734

"priority":

2823

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

2824

":+SIGN-DSA-SHA256",

1735

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

2825

1736

"servicename": "Mandos",

2826

1737

"use_dbus": "True",

2827

1738

"use_ipv6": "True",

2828

1739

"debuglevel": "",

2829

"restore": "True",

2830

"socket": "",

2831

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

2832

"foreground": "False",

2833

"zeroconf": "True",

2834

}

1740

}

2835

1741

2836

1742

# Parse config file for server-global settings

2837

1743

server_config = configparser.SafeConfigParser(server_defaults)

2838

1744

del server_defaults

2839

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

1745

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

1746

"mandos.conf"))

2840

1747

# Convert the SafeConfigParser object to a dict

2841

1748

server_settings = server_config.defaults()

2842

1749

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

2843

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

1750

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

2844

1751

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

2845

1752

option)

2846

1753

if server_settings["port"]:

2847

1754

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

2848

1755

"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"])

2858

1756

del server_config

2859

1757

2860

1758

# Override the settings from the config file with command line

2861

1759

# options, if set.

2862

1760

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

2863

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

2864

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

2865

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

1761

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

1762

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

2866

1763

value = getattr(options, option)

2867

1764

if value is not None:

2868

1765

server_settings[option] = value

2869

1766

del options

2870

1767

# Force all strings to be unicode

2871

1768

for option in server_settings.keys():

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

1769

if type(server_settings[option]) is str:

1770

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

2882

1771

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

2883

1772

2884

1773

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

2885

1774

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

2891

1775

# For convenience

2892

1776

debug = server_settings["debug"]

2893

1777

debuglevel = server_settings["debuglevel"]

2894

1778

use_dbus = server_settings["use_dbus"]

2895

1779

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)

2909

1780

2910

1781

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

2911

syslogger.setFormatter(

2912

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

2913

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

2914

server_settings["servicename"])))

1782

syslogger.setFormatter(logging.Formatter

1783

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

1784

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

1785

% server_settings["servicename"]))

2915

1786

2916

1787

# Parse config file with clients

2917

client_config = configparser.SafeConfigParser(Client

2918

.client_defaults)

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)

2919

1797

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

2920

1798

"clients.conf"))

2921

1799

2922

1800

global mandos_dbus_service

2923

1801

mandos_dbus_service = None

2924

1802

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

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"

2941

1814

try:

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)

1815

pidfile = open(pidfilename, "w")

1816

except IOError:

1817

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

2946

1818

2947

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

2948

("mandos", "mandos"),

2949

("nobody", "nogroup")):

1819

try:

1820

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

1821

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

1822

except KeyError:

2950

1823

try:

2951

uid = pwd.getpwnam(name).pw_uid

2952

gid = pwd.getpwnam(group).pw_gid

2953

break

1824

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

1825

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

2954

1826

except KeyError:

2955

continue

2956

else:

2957

uid = 65534

2958

gid = 65534

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

2959

1833

try:

2960

1834

os.setgid(gid)

2961

1835

os.setuid(uid)

2962

if debug:

2963

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

2964

gid))

2965

1836

except OSError as error:

2966

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

2967

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

2968

if error.errno != errno.EPERM:

2969

raise

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)

2970

1847

2971

1848

if debug:

2972

1849

# Enable all possible GnuTLS debugging

2973

1850

2974

1851

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

2975

1852

# - GnuTLS manual

2976

gnutls.global_set_log_level(11)

1853

gnutls.library.functions.gnutls_global_set_log_level(11)

2977

1854

2978

@gnutls.log_func

1855

@gnutls.library.types.gnutls_log_func

2979

1856

def debug_gnutls(level, string):

2980

1857

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

2981

1858

2982

gnutls.global_set_log_function(debug_gnutls)

1859

(gnutls.library.functions

1860

.gnutls_global_set_log_function(debug_gnutls))

2983

1861

2984

1862

# Redirect stdin so all checkers get /dev/null

2985

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

1863

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

2986

1864

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

2987

1865

if null > 2:

2988

1866

os.close(null)

1867

else:

1868

# No console logging

1869

logger.removeHandler(console)

2989

1870

2990

1871

# Need to fork before connecting to D-Bus

2991

if not foreground:

1872

if not debug:

2992

1873

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

2993

1874

daemon()

2994

1875

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

2999

1876

global main_loop

3000

1877

# From the Avahi example code

3001

DBusGMainLoop(set_as_default=True)

3002

main_loop = GLib.MainLoop()

1878

DBusGMainLoop(set_as_default=True )

1879

main_loop = gobject.MainLoop()

3003

1880

bus = dbus.SystemBus()

3004

1881

# End of Avahi example code

3005

1882

if use_dbus:

3006

1883

try:

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)

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")

3015

1888

use_dbus = False

3016

1889

server_settings["use_dbus"] = False

3017

1890

tcp_server.use_dbus = False

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"))

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"])))

3028

1898

3029

1899

global multiprocessing_manager

3030

1900

multiprocessing_manager = multiprocessing.Manager()

3032

1902

client_class = Client

3033

1903

if use_dbus:

3034

1904

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

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))

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):

3162

1912

try:

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

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()))

3188

1922

if not tcp_server.clients:

3189

1923

logger.warning("No clients defined")

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

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

3201

1937

del pidfilename

1938

1939

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

3202

1940

3203

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

3204

GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,

3205

lambda: main_loop.quit() and False)

1941

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

1942

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

3206

1943

3207

1944

if use_dbus:

3208

3209

@alternate_dbus_interfaces(

3210

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

3211

class MandosDBusService(DBusObjectWithObjectManager):

1945

class MandosDBusService(dbus.service.Object):

3212

1946

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

3213

3214

1947

def __init__(self):

3215

1948

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

3216

3217

_interface = "se.recompile.Mandos"

1949

_interface = "se.bsnet.fukt.Mandos"

3218

1950

3219

1951

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

3220

1952

def ClientAdded(self, objpath):

3226

1958

"D-Bus signal"

3227

1959

pass

3228

1960

3229

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

3230

"true"})

3231

1961

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

3232

1962

def ClientRemoved(self, objpath, name):

3233

1963

"D-Bus signal"

3234

1964

pass

3235

1965

3236

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

3237

"true"})

3238

1966

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

3239

1967

def GetAllClients(self):

3240

1968

"D-Bus method"

3241

return dbus.Array(c.dbus_object_path for c in

3242

tcp_server.clients.values())

1969

return dbus.Array(c.dbus_object_path

1970

for c in tcp_server.clients)

3243

1971

3244

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

3245

"true"})

3246

1972

@dbus.service.method(_interface,

3247

1973

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

3248

1974

def GetAllClientsWithProperties(self):

3249

1975

"D-Bus method"

3250

1976

return dbus.Dictionary(

3251

{ c.dbus_object_path: c.GetAll(

3252

"se.recompile.Mandos.Client")

3253

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

1977

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

1978

for c in tcp_server.clients),

3254

1979

signature="oa{sv}")

3255

1980

3256

1981

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

3257

1982

def RemoveClient(self, object_path):

3258

1983

"D-Bus method"

3259

for c in tcp_server.clients.values():

1984

for c in tcp_server.clients:

3260

1985

if c.dbus_object_path == object_path:

3261

del tcp_server.clients[c.name]

1986

tcp_server.clients.remove(c)

3262

1987

c.remove_from_connection()

3263

# Don't signal the disabling

1988

# Don't signal anything except ClientRemoved

3264

1989

c.disable(quiet=True)

3265

# Emit D-Bus signal for removal

3266

self.client_removed_signal(c)

1990

# Emit D-Bus signal

1991

self.ClientRemoved(object_path, c.name)

3267

1992

return

3268

1993

raise KeyError(object_path)

3269

1994

3270

1995

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)

3307

1996

3308

1997

mandos_dbus_service = MandosDBusService()

3309

1998

3310

1999

def cleanup():

3311

2000

"Cleanup function; run on exit"

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

2001

service.cleanup()

2002

3374

2003

while tcp_server.clients:

3375

name, client = tcp_server.clients.popitem()

2004

client = tcp_server.clients.pop()

3376

2005

if use_dbus:

3377

2006

client.remove_from_connection()

3378

# Don't signal the disabling

2007

client.disable_hook = None

2008

# Don't signal anything except ClientRemoved

3379

2009

client.disable(quiet=True)

3380

# Emit D-Bus signal for removal

3381

2010

if use_dbus:

3382

mandos_dbus_service.client_removed_signal(client)

3383

client_settings.clear()

2011

# Emit D-Bus signal

2012

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2013

client.name)

3384

2014

3385

2015

atexit.register(cleanup)

3386

2016

3387

for client in tcp_server.clients.values():

2017

for client in tcp_server.clients:

3388

2018

if use_dbus:

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()

2019

# Emit D-Bus signal

2020

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2021

client.enable()

3394

2022

3395

2023

tcp_server.enable()

3396

2024

tcp_server.server_activate()

3397

2025

3398

2026

# Find out what port we got

3399

if zeroconf:

3400

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

2027

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

3401

2028

if use_ipv6:

3402

2029

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

3403

" flowinfo %d, scope_id %d",

3404

*tcp_server.socket.getsockname())

2030

" flowinfo %d, scope_id %d"

2031

% tcp_server.socket.getsockname())

3405

2032

else: # IPv4

3406

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

3407

*tcp_server.socket.getsockname())

2033

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

2034

% tcp_server.socket.getsockname())

3408

2035

3409

2036

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

3410

2037

3411

2038

try:

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

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

3421

2047

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))

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))

3426

2052

3427

2053

logger.debug("Starting main loop")

3428

2054

main_loop.run()

3429

2055

except AvahiError as error:

3430

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

2056

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

3431

2057

cleanup()

3432

2058

sys.exit(1)

3433

2059

except KeyboardInterrupt: