/mandos/release : revision 237.7.432

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#!/usr/bin/python

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# -*- mode: python; coding: utf-8 -*-

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#

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# Mandos server - give out binary blobs to connecting clients.

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#

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# This program is partly derived from an example program for an Avahi

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# service publisher, downloaded from

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# <http://avahi.org/wiki/PythonPublishExample>. This includes the

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# methods "add", "remove", "server_state_changed",

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# "entry_group_state_changed", "cleanup", and "activate" in the

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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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15

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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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# the Free Software Foundation, either version 3 of the License, or

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# (at your option) any later version.

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#

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# This program is distributed in the hope that it will be useful,

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# but WITHOUT ANY WARRANTY; without even the implied warranty of

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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

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# GNU General Public License for more details.

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#

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# You should have received a copy of the GNU General Public License

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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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#

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34

from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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37

try:

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from future_builtins import *

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except ImportError:

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pass

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try:

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import SocketServer as socketserver

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except ImportError:

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import socketserver

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import socket

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import argparse

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import datetime

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import errno

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try:

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import ConfigParser as configparser

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except ImportError:

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import configparser

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import sys

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import re

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import os

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import signal

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import subprocess

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import atexit

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import stat

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import logging

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import logging.handlers

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import pwd

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import contextlib

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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 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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from dbus.mainloop.glib import DBusGMainLoop

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import ctypes

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import ctypes.util

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import xml.dom.minidom

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import inspect

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# Try to find the value of SO_BINDTODEVICE:

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try:

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# This is where SO_BINDTODEVICE is in Python 3.3 (or 3.4?) and

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# newer, and it is also the most natural place for it:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except AttributeError:

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try:

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# This is where SO_BINDTODEVICE was up to and including Python

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# 2.6, and also 3.2:

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from IN import SO_BINDTODEVICE

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except ImportError:

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# In Python 2.7 it seems to have been removed entirely.

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# Try running the C preprocessor:

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try:

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cc = subprocess.Popen(["cc", "--language=c", "-E",

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"/dev/stdin"],

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stdin=subprocess.PIPE,

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stdout=subprocess.PIPE)

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stdout = cc.communicate(

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"#include <sys/socket.h>\nSO_BINDTODEVICE\n")[0]

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SO_BINDTODEVICE = int(stdout.splitlines()[-1])

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except (OSError, ValueError, IndexError):

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# No value found

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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 = "1.7.13"

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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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128

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))

134

interface_index = struct.unpack("I", ifreq[16:20])[0]

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return interface_index

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137

138

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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153

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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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175

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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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180

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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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# Only GPG version 1 has the --no-use-agent option.

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if self.gpg == "gpg" or self.gpg.endswith("/gpg"):

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self.gnupgargs.append("--no-use-agent")

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205

def __enter__(self):

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return self

207

208

def __exit__(self, exc_type, exc_value, traceback):

209

self._cleanup()

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return False

211

212

def __del__(self):

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self._cleanup()

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215

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")

236

.replace(b"\0", b"\\x00"))

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return encoded

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239

def encrypt(self, data, password):

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passphrase = self.password_encode(password)

241

with tempfile.NamedTemporaryFile(

242

dir=self.tempdir) as passfile:

243

passfile.write(passphrase)

244

passfile.flush()

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proc = subprocess.Popen([self.gpg, '--symmetric',

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'--passphrase-file',

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passfile.name]

248

+ self.gnupgargs,

249

stdin=subprocess.PIPE,

250

stdout=subprocess.PIPE,

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stderr=subprocess.PIPE)

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

253

if proc.returncode != 0:

254

raise PGPError(err)

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return ciphertext

256

257

def decrypt(self, data, password):

258

passphrase = self.password_encode(password)

259

with tempfile.NamedTemporaryFile(

260

dir=self.tempdir) as passfile:

261

passfile.write(passphrase)

262

passfile.flush()

263

proc = subprocess.Popen([self.gpg, '--decrypt',

264

'--passphrase-file',

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passfile.name]

266

+ self.gnupgargs,

267

stdin=subprocess.PIPE,

268

stdout=subprocess.PIPE,

269

stderr=subprocess.PIPE)

270

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

271

if proc.returncode != 0:

272

raise PGPError(err)

273

return decrypted_plaintext

274

275

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# Pretend that we have an Avahi module

277

class Avahi(object):

278

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

279

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

280

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

281

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

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PROTO_INET = 0 # avahi-common/address.h

283

PROTO_INET6 = 1 # avahi-common/address.h

284

DBUS_NAME = "org.freedesktop.Avahi"

285

DBUS_INTERFACE_ENTRY_GROUP = DBUS_NAME + ".EntryGroup"

286

DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"

287

DBUS_PATH_SERVER = "/"

288

289

def string_array_to_txt_array(self, t):

290

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

291

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

292

ENTRY_GROUP_ESTABLISHED = 2 # avahi-common/defs.h

293

ENTRY_GROUP_COLLISION = 3 # avahi-common/defs.h

294

ENTRY_GROUP_FAILURE = 4 # avahi-common/defs.h

295

SERVER_INVALID = 0 # avahi-common/defs.h

296

SERVER_REGISTERING = 1 # avahi-common/defs.h

297

SERVER_RUNNING = 2 # avahi-common/defs.h

298

SERVER_COLLISION = 3 # avahi-common/defs.h

299

SERVER_FAILURE = 4 # avahi-common/defs.h

300

avahi = Avahi()

301

302

303

class AvahiError(Exception):

304

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

305

self.value = value

306

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

307

**kwargs)

308

309

310

class AvahiServiceError(AvahiError):

311

pass

312

313

314

class AvahiGroupError(AvahiError):

315

pass

316

317

318

class AvahiService(object):

319

"""An Avahi (Zeroconf) service.

320

321

Attributes:

322

interface: integer; avahi.IF_UNSPEC or an interface index.

323

Used to optionally bind to the specified interface.

324

name: string; Example: 'Mandos'

325

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

326

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

327

port: integer; what port to announce

328

TXT: list of strings; TXT record for the service

329

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

330

host: string; Host to publish records for, default is localhost

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max_renames: integer; maximum number of renames

332

rename_count: integer; counter so we only rename after collisions

333

a sensible number of times

334

group: D-Bus Entry Group

335

server: D-Bus Server

336

bus: dbus.SystemBus()

337

"""

338

339

def __init__(self,

340

interface=avahi.IF_UNSPEC,

341

name=None,

342

servicetype=None,

343

port=None,

344

TXT=None,

345

domain="",

346

host="",

347

max_renames=32768,

348

protocol=avahi.PROTO_UNSPEC,

349

bus=None):

350

self.interface = interface

351

self.name = name

352

self.type = servicetype

353

self.port = port

354

self.TXT = TXT if TXT is not None else []

355

self.domain = domain

356

self.host = host

357

self.rename_count = 0

358

self.max_renames = max_renames

359

self.protocol = protocol

360

self.group = None # our entry group

361

self.server = None

362

self.bus = bus

363

self.entry_group_state_changed_match = None

364

365

def rename(self, remove=True):

366

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

367

if self.rename_count >= self.max_renames:

368

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

369

" after %i retries, exiting.",

370

self.rename_count)

371

raise AvahiServiceError("Too many renames")

372

self.name = str(

373

self.server.GetAlternativeServiceName(self.name))

374

self.rename_count += 1

375

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

376

self.name)

377

if remove:

378

self.remove()

379

try:

380

self.add()

381

except dbus.exceptions.DBusException as error:

382

if (error.get_dbus_name()

383

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

384

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

385

return self.rename(remove=False)

386

else:

387

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

388

self.cleanup()

389

os._exit(1)

390

391

def remove(self):

392

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

393

if self.entry_group_state_changed_match is not None:

394

self.entry_group_state_changed_match.remove()

395

self.entry_group_state_changed_match = None

396

if self.group is not None:

397

self.group.Reset()

398

399

def add(self):

400

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

401

self.remove()

402

if self.group is None:

403

self.group = dbus.Interface(

404

self.bus.get_object(avahi.DBUS_NAME,

405

self.server.EntryGroupNew()),

406

avahi.DBUS_INTERFACE_ENTRY_GROUP)

407

self.entry_group_state_changed_match = (

408

self.group.connect_to_signal(

409

'StateChanged', self.entry_group_state_changed))

410

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

411

self.name, self.type)

412

self.group.AddService(

413

self.interface,

414

self.protocol,

415

dbus.UInt32(0), # flags

416

self.name, self.type,

417

self.domain, self.host,

418

dbus.UInt16(self.port),

419

avahi.string_array_to_txt_array(self.TXT))

420

self.group.Commit()

421

422

def entry_group_state_changed(self, state, error):

423

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

424

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

425

426

if state == avahi.ENTRY_GROUP_ESTABLISHED:

427

logger.debug("Zeroconf service established.")

428

elif state == avahi.ENTRY_GROUP_COLLISION:

429

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

430

self.rename()

431

elif state == avahi.ENTRY_GROUP_FAILURE:

432

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

433

str(error))

434

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

435

436

def cleanup(self):

437

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

438

if self.group is not None:

439

try:

440

self.group.Free()

441

except (dbus.exceptions.UnknownMethodException,

442

dbus.exceptions.DBusException):

443

pass

444

self.group = None

445

self.remove()

446

447

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

448

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

449

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

450

bad_states = {

451

avahi.SERVER_INVALID: "Zeroconf server invalid",

452

avahi.SERVER_REGISTERING: None,

453

avahi.SERVER_COLLISION: "Zeroconf server name collision",

454

avahi.SERVER_FAILURE: "Zeroconf server failure",

455

}

456

if state in bad_states:

457

if bad_states[state] is not None:

458

if error is None:

459

logger.error(bad_states[state])

460

else:

461

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

462

self.cleanup()

463

elif state == avahi.SERVER_RUNNING:

464

try:

465

self.add()

466

except dbus.exceptions.DBusException as error:

467

if (error.get_dbus_name()

468

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

469

logger.info("Local Zeroconf service name"

470

" collision.")

471

return self.rename(remove=False)

472

else:

473

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

474

self.cleanup()

475

os._exit(1)

476

else:

477

if error is None:

478

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

479

else:

480

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

481

482

def activate(self):

483

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

484

if self.server is None:

485

self.server = dbus.Interface(

486

self.bus.get_object(avahi.DBUS_NAME,

487

avahi.DBUS_PATH_SERVER,

488

follow_name_owner_changes=True),

489

avahi.DBUS_INTERFACE_SERVER)

490

self.server.connect_to_signal("StateChanged",

491

self.server_state_changed)

492

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

493

494

495

class AvahiServiceToSyslog(AvahiService):

496

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

497

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

498

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

499

syslogger.setFormatter(logging.Formatter(

500

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

501

.format(self.name)))

502

return ret

503

504

505

# Pretend that we have a GnuTLS module

506

class GnuTLS(object):

507

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

508

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

509

510

library = ctypes.util.find_library("gnutls")

511

if library is None:

512

library = ctypes.util.find_library("gnutls-deb0")

513

_library = ctypes.cdll.LoadLibrary(library)

514

del library

515

_need_version = b"3.3.0"

516

517

def __init__(self):

518

# Need to use "self" here, since this method is called before

519

# the assignment to the "gnutls" global variable happens.

520

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

521

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

522

.format(self._need_version))

523

524

# Unless otherwise indicated, the constants and types below are

525

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

526

527

# Constants

528

E_SUCCESS = 0

529

E_INTERRUPTED = -52

530

E_AGAIN = -28

531

CRT_OPENPGP = 2

532

CLIENT = 2

533

SHUT_RDWR = 0

534

CRD_CERTIFICATE = 1

535

E_NO_CERTIFICATE_FOUND = -49

536

OPENPGP_FMT_RAW = 0 # gnutls/openpgp.h

537

538

# Types

539

class session_int(ctypes.Structure):

540

_fields_ = []

541

session_t = ctypes.POINTER(session_int)

542

543

class certificate_credentials_st(ctypes.Structure):

544

_fields_ = []

545

certificate_credentials_t = ctypes.POINTER(

546

certificate_credentials_st)

547

certificate_type_t = ctypes.c_int

548

549

class datum_t(ctypes.Structure):

550

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

551

('size', ctypes.c_uint)]

552

553

class openpgp_crt_int(ctypes.Structure):

554

_fields_ = []

555

openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)

556

openpgp_crt_fmt_t = ctypes.c_int # gnutls/openpgp.h

557

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

558

credentials_type_t = ctypes.c_int

559

transport_ptr_t = ctypes.c_void_p

560

close_request_t = ctypes.c_int

561

562

# Exceptions

563

class Error(Exception):

564

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

565

# exception might be raised from within GnuTLS.__init__,

566

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

567

# global variable has happened.

568

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

569

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

570

# code is passed, convert it to a string with

571

# gnutls.strerror()

572

self.code = code

573

if message is None and code is not None:

574

message = GnuTLS.strerror(code)

575

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

576

message, *args)

577

578

class CertificateSecurityError(Error):

579

pass

580

581

# Classes

582

class Credentials(object):

583

def __init__(self):

584

self._c_object = gnutls.certificate_credentials_t()

585

gnutls.certificate_allocate_credentials(

586

ctypes.byref(self._c_object))

587

self.type = gnutls.CRD_CERTIFICATE

588

589

def __del__(self):

590

gnutls.certificate_free_credentials(self._c_object)

591

592

class ClientSession(object):

593

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

594

self._c_object = gnutls.session_t()

595

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

596

gnutls.set_default_priority(self._c_object)

597

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

598

gnutls.handshake_set_private_extensions(self._c_object,

599

True)

600

self.socket = socket

601

if credentials is None:

602

credentials = gnutls.Credentials()

603

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

604

ctypes.cast(credentials._c_object,

605

ctypes.c_void_p))

606

self.credentials = credentials

607

608

def __del__(self):

609

gnutls.deinit(self._c_object)

610

611

def handshake(self):

612

return gnutls.handshake(self._c_object)

613

614

def send(self, data):

615

data = bytes(data)

616

data_len = len(data)

617

while data_len > 0:

618

data_len -= gnutls.record_send(self._c_object,

619

data[-data_len:],

620

data_len)

621

622

def bye(self):

623

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

624

625

# Error handling functions

626

def _error_code(result):

627

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

628

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

629

if result >= 0:

630

return result

631

if result == gnutls.E_NO_CERTIFICATE_FOUND:

632

raise gnutls.CertificateSecurityError(code=result)

633

raise gnutls.Error(code=result)

634

635

def _retry_on_error(result, func, arguments):

636

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

637

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

638

while result < 0:

639

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

640

return _error_code(result)

641

result = func(*arguments)

642

return result

643

644

# Unless otherwise indicated, the function declarations below are

645

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

646

647

# Functions

648

priority_set_direct = _library.gnutls_priority_set_direct

649

priority_set_direct.argtypes = [session_t, ctypes.c_char_p,

650

ctypes.POINTER(ctypes.c_char_p)]

651

priority_set_direct.restype = _error_code

652

653

init = _library.gnutls_init

654

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

655

init.restype = _error_code

656

657

set_default_priority = _library.gnutls_set_default_priority

658

set_default_priority.argtypes = [session_t]

659

set_default_priority.restype = _error_code

660

661

record_send = _library.gnutls_record_send

662

record_send.argtypes = [session_t, ctypes.c_void_p,

663

ctypes.c_size_t]

664

record_send.restype = ctypes.c_ssize_t

665

record_send.errcheck = _retry_on_error

666

667

certificate_allocate_credentials = (

668

_library.gnutls_certificate_allocate_credentials)

669

certificate_allocate_credentials.argtypes = [

670

ctypes.POINTER(certificate_credentials_t)]

671

certificate_allocate_credentials.restype = _error_code

672

673

certificate_free_credentials = (

674

_library.gnutls_certificate_free_credentials)

675

certificate_free_credentials.argtypes = [

676

certificate_credentials_t]

677

certificate_free_credentials.restype = None

678

679

handshake_set_private_extensions = (

680

_library.gnutls_handshake_set_private_extensions)

681

handshake_set_private_extensions.argtypes = [session_t,

682

ctypes.c_int]

683

handshake_set_private_extensions.restype = None

684

685

credentials_set = _library.gnutls_credentials_set

686

credentials_set.argtypes = [session_t, credentials_type_t,

687

ctypes.c_void_p]

688

credentials_set.restype = _error_code

689

690

strerror = _library.gnutls_strerror

691

strerror.argtypes = [ctypes.c_int]

692

strerror.restype = ctypes.c_char_p

693

694

certificate_type_get = _library.gnutls_certificate_type_get

695

certificate_type_get.argtypes = [session_t]

696

certificate_type_get.restype = _error_code

697

698

certificate_get_peers = _library.gnutls_certificate_get_peers

699

certificate_get_peers.argtypes = [session_t,

700

ctypes.POINTER(ctypes.c_uint)]

701

certificate_get_peers.restype = ctypes.POINTER(datum_t)

702

703

global_set_log_level = _library.gnutls_global_set_log_level

704

global_set_log_level.argtypes = [ctypes.c_int]

705

global_set_log_level.restype = None

706

707

global_set_log_function = _library.gnutls_global_set_log_function

708

global_set_log_function.argtypes = [log_func]

709

global_set_log_function.restype = None

710

711

deinit = _library.gnutls_deinit

712

deinit.argtypes = [session_t]

713

deinit.restype = None

714

715

handshake = _library.gnutls_handshake

716

handshake.argtypes = [session_t]

717

handshake.restype = _error_code

718

handshake.errcheck = _retry_on_error

719

720

transport_set_ptr = _library.gnutls_transport_set_ptr

721

transport_set_ptr.argtypes = [session_t, transport_ptr_t]

722

transport_set_ptr.restype = None

723

724

bye = _library.gnutls_bye

725

bye.argtypes = [session_t, close_request_t]

726

bye.restype = _error_code

727

bye.errcheck = _retry_on_error

728

729

check_version = _library.gnutls_check_version

730

check_version.argtypes = [ctypes.c_char_p]

731

check_version.restype = ctypes.c_char_p

732

733

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

734

735

openpgp_crt_init = _library.gnutls_openpgp_crt_init

736

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

737

openpgp_crt_init.restype = _error_code

738

739

openpgp_crt_import = _library.gnutls_openpgp_crt_import

740

openpgp_crt_import.argtypes = [openpgp_crt_t,

741

ctypes.POINTER(datum_t),

742

openpgp_crt_fmt_t]

743

openpgp_crt_import.restype = _error_code

744

745

openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self

746

openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,

747

ctypes.POINTER(ctypes.c_uint)]

748

openpgp_crt_verify_self.restype = _error_code

749

750

openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit

751

openpgp_crt_deinit.argtypes = [openpgp_crt_t]

752

openpgp_crt_deinit.restype = None

753

754

openpgp_crt_get_fingerprint = (

755

_library.gnutls_openpgp_crt_get_fingerprint)

756

openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,

757

ctypes.c_void_p,

758

ctypes.POINTER(

759

ctypes.c_size_t)]

760

openpgp_crt_get_fingerprint.restype = _error_code

761

762

# Remove non-public functions

763

del _error_code, _retry_on_error

764

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

765

gnutls = GnuTLS()

766

767

768

def call_pipe(connection, # : multiprocessing.Connection

769

func, *args, **kwargs):

770

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

771

772

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

773

return value on the provided multiprocessing.Connection.

774

"""

775

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

776

connection.close()

777

778

779

class Client(object):

780

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

781

782

Attributes:

783

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

784

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

785

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

786

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

787

to see if the client lives.

788

'None' if no process is running.

789

checker_callback_tag: a GLib event source tag, or None

790

checker_command: string; External command which is run to check

791

if client lives. %() expansions are done at

792

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

793

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

794

checker_initiator_tag: a GLib event source tag, or None

795

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

796

client_structure: Object describing what attributes a client has

797

and is used for storing the client at exit

798

current_checker_command: string; current running checker_command

799

disable_initiator_tag: a GLib event source tag, or None

800

enabled: bool()

801

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

802

uniquely identify the client

803

host: string; available for use by the checker command

804

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

805

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

806

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

807

last_checker_status: integer between 0 and 255 reflecting exit

808

status of last checker. -1 reflects crashed

809

checker, -2 means no checker completed yet.

810

last_checker_signal: The signal which killed the last checker, if

811

last_checker_status is -1

812

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

813

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

814

D-Bus identifiers

815

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

816

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

817

until this client is disabled

818

extended_timeout: extra long timeout when secret has been sent

819

runtime_expansions: Allowed attributes for runtime expansion.

820

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

821

disabled, or None

822

server_settings: The server_settings dict from main()

823

"""

824

825

runtime_expansions = ("approval_delay", "approval_duration",

826

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

827

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

828

"last_approval_request", "last_checked_ok",

829

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

830

client_defaults = {

831

"timeout": "PT5M",

832

"extended_timeout": "PT15M",

833

"interval": "PT2M",

834

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

835

"host": "",

836

"approval_delay": "PT0S",

837

"approval_duration": "PT1S",

838

"approved_by_default": "True",

839

"enabled": "True",

840

}

841

842

@staticmethod

843

def config_parser(config):

844

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

845

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

846

with exceptions for any special settings as defined above.

847

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

848

value given the same arguments.

849

"""

850

settings = {}

851

for client_name in config.sections():

852

section = dict(config.items(client_name))

853

client = settings[client_name] = {}

854

855

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

856

# Reformat values from string types to Python types

857

client["approved_by_default"] = config.getboolean(

858

client_name, "approved_by_default")

859

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

860

"enabled")

861

862

# Uppercase and remove spaces from fingerprint for later

863

# comparison purposes with return value from the

864

# fingerprint() function

865

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

866

.replace(" ", ""))

867

if "secret" in section:

868

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

869

.encode("utf-8"),

870

"base64")

871

elif "secfile" in section:

872

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

873

(section["secfile"])),

874

"rb") as secfile:

875

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

876

else:

877

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

878

.format(section))

879

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

880

client["extended_timeout"] = string_to_delta(

881

section["extended_timeout"])

882

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

883

client["approval_delay"] = string_to_delta(

884

section["approval_delay"])

885

client["approval_duration"] = string_to_delta(

886

section["approval_duration"])

887

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

888

client["last_approval_request"] = None

889

client["last_checked_ok"] = None

890

client["last_checker_status"] = -2

891

892

return settings

893

894

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

895

self.name = name

896

if server_settings is None:

897

server_settings = {}

898

self.server_settings = server_settings

899

# adding all client settings

900

for setting, value in settings.items():

901

setattr(self, setting, value)

902

903

if self.enabled:

904

if not hasattr(self, "last_enabled"):

905

self.last_enabled = datetime.datetime.utcnow()

906

if not hasattr(self, "expires"):

907

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

908

+ self.timeout)

909

else:

910

self.last_enabled = None

911

self.expires = None

912

913

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

914

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

915

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

916

datetime.datetime.utcnow())

917

918

# attributes specific for this server instance

919

self.checker = None

920

self.checker_initiator_tag = None

921

self.disable_initiator_tag = None

922

self.checker_callback_tag = None

923

self.current_checker_command = None

924

self.approved = None

925

self.approvals_pending = 0

926

self.changedstate = multiprocessing_manager.Condition(

927

multiprocessing_manager.Lock())

928

self.client_structure = [attr

929

for attr in self.__dict__.keys()

930

if not attr.startswith("_")]

931

self.client_structure.append("client_structure")

932

933

for name, t in inspect.getmembers(

934

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

935

if not name.startswith("_"):

936

self.client_structure.append(name)

937

938

# Send notice to process children that client state has changed

939

def send_changedstate(self):

940

with self.changedstate:

941

self.changedstate.notify_all()

942

943

def enable(self):

944

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

945

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

946

# Already enabled

947

return

948

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

949

self.enabled = True

950

self.last_enabled = datetime.datetime.utcnow()

951

self.init_checker()

952

self.send_changedstate()

953

954

def disable(self, quiet=True):

955

"""Disable this client."""

956

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

957

return False

958

if not quiet:

959

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

960

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

961

GLib.source_remove(self.disable_initiator_tag)

962

self.disable_initiator_tag = None

963

self.expires = None

964

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

965

GLib.source_remove(self.checker_initiator_tag)

966

self.checker_initiator_tag = None

967

self.stop_checker()

968

self.enabled = False

969

if not quiet:

970

self.send_changedstate()

971

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

972

return False

973

974

def __del__(self):

975

self.disable()

976

977

def init_checker(self):

978

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

979

# and every interval from then on.

980

if self.checker_initiator_tag is not None:

981

GLib.source_remove(self.checker_initiator_tag)

982

self.checker_initiator_tag = GLib.timeout_add(

983

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

984

self.start_checker)

985

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

986

if self.disable_initiator_tag is not None:

987

GLib.source_remove(self.disable_initiator_tag)

988

self.disable_initiator_tag = GLib.timeout_add(

989

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

990

# Also start a new checker *right now*.

991

self.start_checker()

992

993

def checker_callback(self, source, condition, connection,

994

command):

995

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

996

self.checker_callback_tag = None

997

self.checker = None

998

# Read return code from connection (see call_pipe)

999

returncode = connection.recv()

1000

connection.close()

1001

1002

if returncode >= 0:

1003

self.last_checker_status = returncode

1004

self.last_checker_signal = None

1005

if self.last_checker_status == 0:

1006

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

1007

vars(self))

1008

self.checked_ok()

1009

else:

1010

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

1011

else:

1012

self.last_checker_status = -1

1013

self.last_checker_signal = -returncode

1014

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

1015

vars(self))

1016

return False

1017

1018

def checked_ok(self):

1019

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

1020

self.last_checked_ok = datetime.datetime.utcnow()

1021

self.last_checker_status = 0

1022

self.last_checker_signal = None

1023

self.bump_timeout()

1024

1025

def bump_timeout(self, timeout=None):

1026

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

1027

if timeout is None:

1028

timeout = self.timeout

1029

if self.disable_initiator_tag is not None:

1030

GLib.source_remove(self.disable_initiator_tag)

1031

self.disable_initiator_tag = None

1032

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

1033

self.disable_initiator_tag = GLib.timeout_add(

1034

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

1035

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

1036

1037

def need_approval(self):

1038

self.last_approval_request = datetime.datetime.utcnow()

1039

1040

def start_checker(self):

1041

"""Start a new checker subprocess if one is not running.

1042

1043

If a checker already exists, leave it running and do

1044

nothing."""

1045

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

1046

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

1047

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

1048

# would inevitably timeout, since no checker would get a

1049

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

1050

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

1051

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

1052

# should be.

1053

1054

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

1055

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

1056

self.checker.join()

1057

self.checker = None

1058

# Start a new checker if needed

1059

if self.checker is None:

1060

# Escape attributes for the shell

1061

escaped_attrs = {

1062

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

1063

for attr in self.runtime_expansions}

1064

try:

1065

command = self.checker_command % escaped_attrs

1066

except TypeError as error:

1067

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

1068

self.checker_command,

1069

exc_info=error)

1070

return True # Try again later

1071

self.current_checker_command = command

1072

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

1073

self.name)

1074

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

1075

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

1076

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

1077

# always replaced by /dev/null.)

1078

# The exception is when not debugging but nevertheless

1079

# running in the foreground; use the previously

1080

# created wnull.

1081

popen_args = {"close_fds": True,

1082

"shell": True,

1083

"cwd": "/"}

1084

if (not self.server_settings["debug"]

1085

and self.server_settings["foreground"]):

1086

popen_args.update({"stdout": wnull,

1087

"stderr": wnull})

1088

pipe = multiprocessing.Pipe(duplex=False)

1089

self.checker = multiprocessing.Process(

1090

target=call_pipe,

1091

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

1092

kwargs=popen_args)

1093

self.checker.start()

1094

self.checker_callback_tag = GLib.io_add_watch(

1095

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

1096

self.checker_callback, pipe[0], command)

1097

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

1098

return True

1099

1100

def stop_checker(self):

1101

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

1102

if self.checker_callback_tag:

1103

GLib.source_remove(self.checker_callback_tag)

1104

self.checker_callback_tag = None

1105

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

1106

return

1107

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

1108

self.checker.terminate()

1109

self.checker = None

1110

1111

1112

def dbus_service_property(dbus_interface,

1113

signature="v",

1114

access="readwrite",

1115

byte_arrays=False):

1116

"""Decorators for marking methods of a DBusObjectWithProperties to

1117

become properties on the D-Bus.

1118

1119

The decorated method will be called with no arguments by "Get"

1120

and with one argument by "Set".

1121

1122

The parameters, where they are supported, are the same as

1123

dbus.service.method, except there is only "signature", since the

1124

type from Get() and the type sent to Set() is the same.

1125

"""

1126

# Encoding deeply encoded byte arrays is not supported yet by the

1127

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

1128

if byte_arrays and signature != "ay":

1129

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

1130

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

1131

1132

def decorator(func):

1133

func._dbus_is_property = True

1134

func._dbus_interface = dbus_interface

1135

func._dbus_signature = signature

1136

func._dbus_access = access

1137

func._dbus_name = func.__name__

1138

if func._dbus_name.endswith("_dbus_property"):

1139

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

1140

func._dbus_get_args_options = {'byte_arrays': byte_arrays}

1141

return func

1142

1143

return decorator

1144

1145

1146

def dbus_interface_annotations(dbus_interface):

1147

"""Decorator for marking functions returning interface annotations

1148

1149

Usage:

1150

1151

@dbus_interface_annotations("org.example.Interface")

1152

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

1153

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

1154

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

1155

"false"}

1156

"""

1157

1158

def decorator(func):

1159

func._dbus_is_interface = True

1160

func._dbus_interface = dbus_interface

1161

func._dbus_name = dbus_interface

1162

return func

1163

1164

return decorator

1165

1166

1167

def dbus_annotations(annotations):

1168

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

1169

Usage:

1170

1171

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

1172

"org.freedesktop.DBus.Property."

1173

"EmitsChangedSignal": "false"})

1174

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

1175

access="r")

1176

def Property_dbus_property(self):

1177

return dbus.Boolean(False)

1178

1179

See also the DBusObjectWithAnnotations class.

1180

"""

1181

1182

def decorator(func):

1183

func._dbus_annotations = annotations

1184

return func

1185

1186

return decorator

1187

1188

1189

class DBusPropertyException(dbus.exceptions.DBusException):

1190

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

1191

"""

1192

pass

1193

1194

1195

class DBusPropertyAccessException(DBusPropertyException):

1196

"""A property's access permissions disallows an operation.

1197

"""

1198

pass

1199

1200

1201

class DBusPropertyNotFound(DBusPropertyException):

1202

"""An attempt was made to access a non-existing property.

1203

"""

1204

pass

1205

1206

1207

class DBusObjectWithAnnotations(dbus.service.Object):

1208

"""A D-Bus object with annotations.

1209

1210

Classes inheriting from this can use the dbus_annotations

1211

decorator to add annotations to methods or signals.

1212

"""

1213

1214

@staticmethod

1215

def _is_dbus_thing(thing):

1216

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

1217

1218

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

1219

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

1220

"""

1221

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

1222

False)

1223

1224

def _get_all_dbus_things(self, thing):

1225

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

1226

"""

1227

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

1228

athing.__get__(self))

1229

for cls in self.__class__.__mro__

1230

for name, athing in

1231

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

1232

1233

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1234

out_signature="s",

1235

path_keyword='object_path',

1236

connection_keyword='connection')

1237

def Introspect(self, object_path, connection):

1238

"""Overloading of standard D-Bus method.

1239

1240

Inserts annotation tags on methods and signals.

1241

"""

1242

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

1243

connection)

1244

try:

1245

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

1246

1247

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

1248

# Add annotation tags

1249

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

1250

for tag in if_tag.getElementsByTagName(typ):

1251

annots = dict()

1252

for name, prop in (self.

1253

_get_all_dbus_things(typ)):

1254

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

1255

and prop._dbus_interface

1256

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

1257

annots.update(getattr(

1258

prop, "_dbus_annotations", {}))

1259

for name, value in annots.items():

1260

ann_tag = document.createElement(

1261

"annotation")

1262

ann_tag.setAttribute("name", name)

1263

ann_tag.setAttribute("value", value)

1264

tag.appendChild(ann_tag)

1265

# Add interface annotation tags

1266

for annotation, value in dict(

1267

itertools.chain.from_iterable(

1268

annotations().items()

1269

for name, annotations

1270

in self._get_all_dbus_things("interface")

1271

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

1272

)).items():

1273

ann_tag = document.createElement("annotation")

1274

ann_tag.setAttribute("name", annotation)

1275

ann_tag.setAttribute("value", value)

1276

if_tag.appendChild(ann_tag)

1277

# Fix argument name for the Introspect method itself

1278

if (if_tag.getAttribute("name")

1279

== dbus.INTROSPECTABLE_IFACE):

1280

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

1281

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

1282

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

1283

if (arg.getAttribute("direction")

1284

== "out"):

1285

arg.setAttribute("name",

1286

"xml_data")

1287

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

1288

document.unlink()

1289

except (AttributeError, xml.dom.DOMException,

1290

xml.parsers.expat.ExpatError) as error:

1291

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

1292

exc_info=error)

1293

return xmlstring

1294

1295

1296

class DBusObjectWithProperties(DBusObjectWithAnnotations):

1297

"""A D-Bus object with properties.

1298

1299

Classes inheriting from this can use the dbus_service_property

1300

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

1301

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

1302

"""

1303

1304

def _get_dbus_property(self, interface_name, property_name):

1305

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

1306

property with the specified name and interface.

1307

"""

1308

for cls in self.__class__.__mro__:

1309

for name, value in inspect.getmembers(

1310

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

1311

if (value._dbus_name == property_name

1312

and value._dbus_interface == interface_name):

1313

return value.__get__(self)

1314

1315

# No such property

1316

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

1317

self.dbus_object_path, interface_name, property_name))

1318

1319

@classmethod

1320

def _get_all_interface_names(cls):

1321

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

1322

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

1323

"_dbus_interface", None)

1324

for x in (inspect.getmro(cls))

1325

for attr in dir(x))

1326

if name is not None)

1327

1328

@dbus.service.method(dbus.PROPERTIES_IFACE,

1329

in_signature="ss",

1330

out_signature="v")

1331

def Get(self, interface_name, property_name):

1332

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

1333

"""

1334

prop = self._get_dbus_property(interface_name, property_name)

1335

if prop._dbus_access == "write":

1336

raise DBusPropertyAccessException(property_name)

1337

value = prop()

1338

if not hasattr(value, "variant_level"):

1339

return value

1340

return type(value)(value, variant_level=value.variant_level+1)

1341

1342

@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")

1343

def Set(self, interface_name, property_name, value):

1344

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

1345

"""

1346

prop = self._get_dbus_property(interface_name, property_name)

1347

if prop._dbus_access == "read":

1348

raise DBusPropertyAccessException(property_name)

1349

if prop._dbus_get_args_options["byte_arrays"]:

1350

# The byte_arrays option is not supported yet on

1351

# signatures other than "ay".

1352

if prop._dbus_signature != "ay":

1353

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

1354

"'ay' signature {!r}"

1355

.format(prop._dbus_signature))

1356

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

1357

for byte in value))

1358

prop(value)

1359

1360

@dbus.service.method(dbus.PROPERTIES_IFACE,

1361

in_signature="s",

1362

out_signature="a{sv}")

1363

def GetAll(self, interface_name):

1364

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

1365

standard.

1366

1367

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

1368

"""

1369

properties = {}

1370

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

1371

if (interface_name

1372

and interface_name != prop._dbus_interface):

1373

# Interface non-empty but did not match

1374

continue

1375

# Ignore write-only properties

1376

if prop._dbus_access == "write":

1377

continue

1378

value = prop()

1379

if not hasattr(value, "variant_level"):

1380

properties[name] = value

1381

continue

1382

properties[name] = type(value)(

1383

value, variant_level=value.variant_level + 1)

1384

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

1385

1386

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

1387

def PropertiesChanged(self, interface_name, changed_properties,

1388

invalidated_properties):

1389

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

1390

standard.

1391

"""

1392

pass

1393

1394

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1395

out_signature="s",

1396

path_keyword='object_path',

1397

connection_keyword='connection')

1398

def Introspect(self, object_path, connection):

1399

"""Overloading of standard D-Bus method.

1400

1401

Inserts property tags and interface annotation tags.

1402

"""

1403

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1404

object_path,

1405

connection)

1406

try:

1407

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

1408

1409

def make_tag(document, name, prop):

1410

e = document.createElement("property")

1411

e.setAttribute("name", name)

1412

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

1413

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

1414

return e

1415

1416

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

1417

# Add property tags

1418

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

1419

for name, prop

1420

in self._get_all_dbus_things("property")

1421

if prop._dbus_interface

1422

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

1423

if_tag.appendChild(tag)

1424

# Add annotation tags for properties

1425

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

1426

annots = dict()

1427

for name, prop in self._get_all_dbus_things(

1428

"property"):

1429

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

1430

and prop._dbus_interface

1431

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

1432

annots.update(getattr(

1433

prop, "_dbus_annotations", {}))

1434

for name, value in annots.items():

1435

ann_tag = document.createElement(

1436

"annotation")

1437

ann_tag.setAttribute("name", name)

1438

ann_tag.setAttribute("value", value)

1439

tag.appendChild(ann_tag)

1440

# Add the names to the return values for the

1441

# "org.freedesktop.DBus.Properties" methods

1442

if (if_tag.getAttribute("name")

1443

== "org.freedesktop.DBus.Properties"):

1444

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

1445

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

1446

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

1447

if (arg.getAttribute("direction")

1448

== "out"):

1449

arg.setAttribute("name", "value")

1450

elif cn.getAttribute("name") == "GetAll":

1451

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

1452

if (arg.getAttribute("direction")

1453

== "out"):

1454

arg.setAttribute("name", "props")

1455

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

1456

document.unlink()

1457

except (AttributeError, xml.dom.DOMException,

1458

xml.parsers.expat.ExpatError) as error:

1459

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

1460

exc_info=error)

1461

return xmlstring

1462

1463

try:

1464

dbus.OBJECT_MANAGER_IFACE

1465

except AttributeError:

1466

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

1467

1468

1469

class DBusObjectWithObjectManager(DBusObjectWithAnnotations):

1470

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

1471

1472

Classes inheriting from this exposes the standard

1473

GetManagedObjects call and the InterfacesAdded and

1474

InterfacesRemoved signals on the standard

1475

"org.freedesktop.DBus.ObjectManager" interface.

1476

1477

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

1478

manually.

1479

"""

1480

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

1481

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

1482

def GetManagedObjects(self):

1483

"""This function must be overridden"""

1484

raise NotImplementedError()

1485

1486

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,

1487

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

1488

def InterfacesAdded(self, object_path, interfaces_and_properties):

1489

pass

1490

1491

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

1492

def InterfacesRemoved(self, object_path, interfaces):

1493

pass

1494

1495

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1496

out_signature="s",

1497

path_keyword='object_path',

1498

connection_keyword='connection')

1499

def Introspect(self, object_path, connection):

1500

"""Overloading of standard D-Bus method.

1501

1502

Override return argument name of GetManagedObjects to be

1503

"objpath_interfaces_and_properties"

1504

"""

1505

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1506

object_path,

1507

connection)

1508

try:

1509

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

1510

1511

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

1512

# Fix argument name for the GetManagedObjects method

1513

if (if_tag.getAttribute("name")

1514

== dbus.OBJECT_MANAGER_IFACE):

1515

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

1516

if (cn.getAttribute("name")

1517

== "GetManagedObjects"):

1518

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

1519

if (arg.getAttribute("direction")

1520

== "out"):

1521

arg.setAttribute(

1522

"name",

1523

"objpath_interfaces"

1524

"_and_properties")

1525

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

1526

document.unlink()

1527

except (AttributeError, xml.dom.DOMException,

1528

xml.parsers.expat.ExpatError) as error:

1529

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

1530

exc_info=error)

1531

return xmlstring

1532

1533

1534

def datetime_to_dbus(dt, variant_level=0):

1535

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

1536

if dt is None:

1537

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

1538

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

1539

1540

1541

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1542

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

1543

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

1544

interface names according to the "alt_interface_names" mapping.

1545

Usage:

1546

1547

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

1548

"net.example.AlternateInterface"})

1549

class SampleDBusObject(dbus.service.Object):

1550

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

1551

def SampleDBusMethod():

1552

pass

1553

1554

The above "SampleDBusMethod" on "SampleDBusObject" will be

1555

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

1556

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

1557

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

1558

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

1559

1560

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

1561

(from DBusObjectWithProperties) and interfaces (from the

1562

dbus_interface_annotations decorator).

1563

"""

1564

1565

def wrapper(cls):

1566

for orig_interface_name, alt_interface_name in (

1567

alt_interface_names.items()):

1568

attr = {}

1569

interface_names = set()

1570

# Go though all attributes of the class

1571

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

1572

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

1573

# with the wrong interface name

1574

if (not hasattr(attribute, "_dbus_interface")

1575

or not attribute._dbus_interface.startswith(

1576

orig_interface_name)):

1577

continue

1578

# Create an alternate D-Bus interface name based on

1579

# the current name

1580

alt_interface = attribute._dbus_interface.replace(

1581

orig_interface_name, alt_interface_name)

1582

interface_names.add(alt_interface)

1583

# Is this a D-Bus signal?

1584

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

1585

# Extract the original non-method undecorated

1586

# function by black magic

1587

if sys.version_info.major == 2:

1588

nonmethod_func = (dict(

1589

zip(attribute.func_code.co_freevars,

1590

attribute.__closure__))

1591

["func"].cell_contents)

1592

else:

1593

nonmethod_func = (dict(

1594

zip(attribute.__code__.co_freevars,

1595

attribute.__closure__))

1596

["func"].cell_contents)

1597

# Create a new, but exactly alike, function

1598

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

1599

# with the alternate D-Bus interface name

1600

new_function = copy_function(nonmethod_func)

1601

new_function = (dbus.service.signal(

1602

alt_interface,

1603

attribute._dbus_signature)(new_function))

1604

# Copy annotations, if any

1605

try:

1606

new_function._dbus_annotations = dict(

1607

attribute._dbus_annotations)

1608

except AttributeError:

1609

pass

1610

1611

# Define a creator of a function to call both the

1612

# original and alternate functions, so both the

1613

# original and alternate signals gets sent when

1614

# the function is called

1615

def fixscope(func1, func2):

1616

"""This function is a scope container to pass

1617

func1 and func2 to the "call_both" function

1618

outside of its arguments"""

1619

1620

@functools.wraps(func2)

1621

def call_both(*args, **kwargs):

1622

"""This function will emit two D-Bus

1623

signals by calling func1 and func2"""

1624

func1(*args, **kwargs)

1625

func2(*args, **kwargs)

1626

# Make wrapper function look like a D-Bus

1627

# signal

1628

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

1629

if name.startswith("_dbus_"):

1630

setattr(call_both, name, attr)

1631

1632

return call_both

1633

# Create the "call_both" function and add it to

1634

# the class

1635

attr[attrname] = fixscope(attribute, new_function)

1636

# Is this a D-Bus method?

1637

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

1638

# Create a new, but exactly alike, function

1639

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

1640

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

1641

# to the class.

1642

attr[attrname] = (

1643

dbus.service.method(

1644

alt_interface,

1645

attribute._dbus_in_signature,

1646

attribute._dbus_out_signature)

1647

(copy_function(attribute)))

1648

# Copy annotations, if any

1649

try:

1650

attr[attrname]._dbus_annotations = dict(

1651

attribute._dbus_annotations)

1652

except AttributeError:

1653

pass

1654

# Is this a D-Bus property?

1655

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

1656

# Create a new, but exactly alike, function

1657

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

1658

# property with the alternate D-Bus interface

1659

# name. Add it to the class.

1660

attr[attrname] = (dbus_service_property(

1661

alt_interface, attribute._dbus_signature,

1662

attribute._dbus_access,

1663

attribute._dbus_get_args_options

1664

["byte_arrays"])

1665

(copy_function(attribute)))

1666

# Copy annotations, if any

1667

try:

1668

attr[attrname]._dbus_annotations = dict(

1669

attribute._dbus_annotations)

1670

except AttributeError:

1671

pass

1672

# Is this a D-Bus interface?

1673

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

1674

# Create a new, but exactly alike, function

1675

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

1676

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

1677

# to the class.

1678

attr[attrname] = (

1679

dbus_interface_annotations(alt_interface)

1680

(copy_function(attribute)))

1681

if deprecate:

1682

# Deprecate all alternate interfaces

1683

iname = "_AlternateDBusNames_interface_annotation{}"

1684

for interface_name in interface_names:

1685

1686

@dbus_interface_annotations(interface_name)

1687

def func(self):

1688

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

1689

"true"}

1690

# Find an unused name

1691

for aname in (iname.format(i)

1692

for i in itertools.count()):

1693

if aname not in attr:

1694

attr[aname] = func

1695

break

1696

if interface_names:

1697

# Replace the class with a new subclass of it with

1698

# methods, signals, etc. as created above.

1699

if sys.version_info.major == 2:

1700

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

1701

(cls, ), attr)

1702

else:

1703

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

1704

(cls, ), attr)

1705

return cls

1706

1707

return wrapper

1708

1709

1710

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

1711

"se.bsnet.fukt.Mandos"})

1712

class ClientDBus(Client, DBusObjectWithProperties):

1713

"""A Client class using D-Bus

1714

1715

Attributes:

1716

dbus_object_path: dbus.ObjectPath

1717

bus: dbus.SystemBus()

1718

"""

1719

1720

runtime_expansions = (Client.runtime_expansions

1721

+ ("dbus_object_path", ))

1722

1723

_interface = "se.recompile.Mandos.Client"

1724

1725

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

1726

1727

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

1728

self.bus = bus

1729

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

1730

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

1731

# the D-Bus

1732

client_object_name = str(self.name).translate(

1733

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

1734

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

1735

self.dbus_object_path = dbus.ObjectPath(

1736

"/clients/" + client_object_name)

1737

DBusObjectWithProperties.__init__(self, self.bus,

1738

self.dbus_object_path)

1739

1740

def notifychangeproperty(transform_func, dbus_name,

1741

type_func=lambda x: x,

1742

variant_level=1,

1743

invalidate_only=False,

1744

_interface=_interface):

1745

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

1746

its changes to DBus.

1747

1748

transform_fun: Function that takes a value and a variant_level

1749

and transforms it to a D-Bus type.

1750

dbus_name: D-Bus name of the variable

1751

type_func: Function that transform the value before sending it

1752

to the D-Bus. Default: no transform

1753

variant_level: D-Bus variant level. Default: 1

1754

"""

1755

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

1756

1757

def setter(self, value):

1758

if hasattr(self, "dbus_object_path"):

1759

if (not hasattr(self, attrname) or

1760

type_func(getattr(self, attrname, None))

1761

!= type_func(value)):

1762

if invalidate_only:

1763

self.PropertiesChanged(

1764

_interface, dbus.Dictionary(),

1765

dbus.Array((dbus_name, )))

1766

else:

1767

dbus_value = transform_func(

1768

type_func(value),

1769

variant_level=variant_level)

1770

self.PropertyChanged(dbus.String(dbus_name),

1771

dbus_value)

1772

self.PropertiesChanged(

1773

_interface,

1774

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

1775

dbus_value}),

1776

dbus.Array())

1777

setattr(self, attrname, value)

1778

1779

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

1780

1781

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1782

approvals_pending = notifychangeproperty(dbus.Boolean,

1783

"ApprovalPending",

1784

type_func=bool)

1785

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

1786

last_enabled = notifychangeproperty(datetime_to_dbus,

1787

"LastEnabled")

1788

checker = notifychangeproperty(

1789

dbus.Boolean, "CheckerRunning",

1790

type_func=lambda checker: checker is not None)

1791

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1792

"LastCheckedOK")

1793

last_checker_status = notifychangeproperty(dbus.Int16,

1794

"LastCheckerStatus")

1795

last_approval_request = notifychangeproperty(

1796

datetime_to_dbus, "LastApprovalRequest")

1797

approved_by_default = notifychangeproperty(dbus.Boolean,

1798

"ApprovedByDefault")

1799

approval_delay = notifychangeproperty(

1800

dbus.UInt64, "ApprovalDelay",

1801

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

1802

approval_duration = notifychangeproperty(

1803

dbus.UInt64, "ApprovalDuration",

1804

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

1805

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

1806

timeout = notifychangeproperty(

1807

dbus.UInt64, "Timeout",

1808

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

1809

extended_timeout = notifychangeproperty(

1810

dbus.UInt64, "ExtendedTimeout",

1811

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

1812

interval = notifychangeproperty(

1813

dbus.UInt64, "Interval",

1814

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

1815

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

1816

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

1817

invalidate_only=True)

1818

1819

del notifychangeproperty

1820

1821

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

1822

try:

1823

self.remove_from_connection()

1824

except LookupError:

1825

pass

1826

if hasattr(DBusObjectWithProperties, "__del__"):

1827

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

1828

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

1829

1830

def checker_callback(self, source, condition,

1831

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

1832

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

1833

connection, command, *args,

1834

**kwargs)

1835

exitstatus = self.last_checker_status

1836

if exitstatus >= 0:

1837

# Emit D-Bus signal

1838

self.CheckerCompleted(dbus.Int16(exitstatus),

1839

# This is specific to GNU libC

1840

dbus.Int64(exitstatus << 8),

1841

dbus.String(command))

1842

else:

1843

# Emit D-Bus signal

1844

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

1845

dbus.Int64(

1846

# This is specific to GNU libC

1847

(exitstatus << 8)

1848

| self.last_checker_signal),

1849

dbus.String(command))

1850

return ret

1851

1852

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

1853

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

1854

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

1855

# Only if new checker process was started

1856

if (self.checker is not None

1857

and old_checker_pid != self.checker.pid):

1858

# Emit D-Bus signal

1859

self.CheckerStarted(self.current_checker_command)

1860

return r

1861

1862

def _reset_approved(self):

1863

self.approved = None

1864

return False

1865

1866

def approve(self, value=True):

1867

self.approved = value

1868

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

1869

* 1000), self._reset_approved)

1870

self.send_changedstate()

1871

1872

# D-Bus methods, signals & properties

1873

1874

# Interfaces

1875

1876

# Signals

1877

1878

# CheckerCompleted - signal

1879

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

1880

def CheckerCompleted(self, exitcode, waitstatus, command):

1881

"D-Bus signal"

1882

pass

1883

1884

# CheckerStarted - signal

1885

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

1886

def CheckerStarted(self, command):

1887

"D-Bus signal"

1888

pass

1889

1890

# PropertyChanged - signal

1891

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

1892

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

1893

def PropertyChanged(self, property, value):

1894

"D-Bus signal"

1895

pass

1896

1897

# GotSecret - signal

1898

@dbus.service.signal(_interface)

1899

def GotSecret(self):

1900

"""D-Bus signal

1901

Is sent after a successful transfer of secret from the Mandos

1902

server to mandos-client

1903

"""

1904

pass

1905

1906

# Rejected - signal

1907

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

1908

def Rejected(self, reason):

1909

"D-Bus signal"

1910

pass

1911

1912

# NeedApproval - signal

1913

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

1914

def NeedApproval(self, timeout, default):

1915

"D-Bus signal"

1916

return self.need_approval()

1917

1918

# Methods

1919

1920

# Approve - method

1921

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

1922

def Approve(self, value):

1923

self.approve(value)

1924

1925

# CheckedOK - method

1926

@dbus.service.method(_interface)

1927

def CheckedOK(self):

1928

self.checked_ok()

1929

1930

# Enable - method

1931

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

1932

@dbus.service.method(_interface)

1933

def Enable(self):

1934

"D-Bus method"

1935

self.enable()

1936

1937

# StartChecker - method

1938

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

1939

@dbus.service.method(_interface)

1940

def StartChecker(self):

1941

"D-Bus method"

1942

self.start_checker()

1943

1944

# Disable - method

1945

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

1946

@dbus.service.method(_interface)

1947

def Disable(self):

1948

"D-Bus method"

1949

self.disable()

1950

1951

# StopChecker - method

1952

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

1953

@dbus.service.method(_interface)

1954

def StopChecker(self):

1955

self.stop_checker()

1956

1957

# Properties

1958

1959

# ApprovalPending - property

1960

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

1961

def ApprovalPending_dbus_property(self):

1962

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

1963

1964

# ApprovedByDefault - property

1965

@dbus_service_property(_interface,

1966

signature="b",

1967

access="readwrite")

1968

def ApprovedByDefault_dbus_property(self, value=None):

1969

if value is None: # get

1970

return dbus.Boolean(self.approved_by_default)

1971

self.approved_by_default = bool(value)

1972

1973

# ApprovalDelay - property

1974

@dbus_service_property(_interface,

1975

signature="t",

1976

access="readwrite")

1977

def ApprovalDelay_dbus_property(self, value=None):

1978

if value is None: # get

1979

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

1980

* 1000)

1981

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

1982

1983

# ApprovalDuration - property

1984

@dbus_service_property(_interface,

1985

signature="t",

1986

access="readwrite")

1987

def ApprovalDuration_dbus_property(self, value=None):

1988

if value is None: # get

1989

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

1990

* 1000)

1991

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

1992

1993

# Name - property

1994

@dbus_annotations(

1995

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

1996

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

1997

def Name_dbus_property(self):

1998

return dbus.String(self.name)

1999

2000

# Fingerprint - property

2001

@dbus_annotations(

2002

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

2003

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

2004

def Fingerprint_dbus_property(self):

2005

return dbus.String(self.fingerprint)

2006

2007

# Host - property

2008

@dbus_service_property(_interface,

2009

signature="s",

2010

access="readwrite")

2011

def Host_dbus_property(self, value=None):

2012

if value is None: # get

2013

return dbus.String(self.host)

2014

self.host = str(value)

2015

2016

# Created - property

2017

@dbus_annotations(

2018

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

2019

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

2020

def Created_dbus_property(self):

2021

return datetime_to_dbus(self.created)

2022

2023

# LastEnabled - property

2024

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

2025

def LastEnabled_dbus_property(self):

2026

return datetime_to_dbus(self.last_enabled)

2027

2028

# Enabled - property

2029

@dbus_service_property(_interface,

2030

signature="b",

2031

access="readwrite")

2032

def Enabled_dbus_property(self, value=None):

2033

if value is None: # get

2034

return dbus.Boolean(self.enabled)

2035

if value:

2036

self.enable()

2037

else:

2038

self.disable()

2039

2040

# LastCheckedOK - property

2041

@dbus_service_property(_interface,

2042

signature="s",

2043

access="readwrite")

2044

def LastCheckedOK_dbus_property(self, value=None):

2045

if value is not None:

2046

self.checked_ok()

2047

return

2048

return datetime_to_dbus(self.last_checked_ok)

2049

2050

# LastCheckerStatus - property

2051

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

2052

def LastCheckerStatus_dbus_property(self):

2053

return dbus.Int16(self.last_checker_status)

2054

2055

# Expires - property

2056

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

2057

def Expires_dbus_property(self):

2058

return datetime_to_dbus(self.expires)

2059

2060

# LastApprovalRequest - property

2061

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

2062

def LastApprovalRequest_dbus_property(self):

2063

return datetime_to_dbus(self.last_approval_request)

2064

2065

# Timeout - property

2066

@dbus_service_property(_interface,

2067

signature="t",

2068

access="readwrite")

2069

def Timeout_dbus_property(self, value=None):

2070

if value is None: # get

2071

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

2072

old_timeout = self.timeout

2073

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

2074

# Reschedule disabling

2075

if self.enabled:

2076

now = datetime.datetime.utcnow()

2077

self.expires += self.timeout - old_timeout

2078

if self.expires <= now:

2079

# The timeout has passed

2080

self.disable()

2081

else:

2082

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

2083

is None):

2084

return

2085

GLib.source_remove(self.disable_initiator_tag)

2086

self.disable_initiator_tag = GLib.timeout_add(

2087

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

2088

self.disable)

2089

2090

# ExtendedTimeout - property

2091

@dbus_service_property(_interface,

2092

signature="t",

2093

access="readwrite")

2094

def ExtendedTimeout_dbus_property(self, value=None):

2095

if value is None: # get

2096

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

2097

* 1000)

2098

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

2099

2100

# Interval - property

2101

@dbus_service_property(_interface,

2102

signature="t",

2103

access="readwrite")

2104

def Interval_dbus_property(self, value=None):

2105

if value is None: # get

2106

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

2107

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

2108

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

2109

return

2110

if self.enabled:

2111

# Reschedule checker run

2112

GLib.source_remove(self.checker_initiator_tag)

2113

self.checker_initiator_tag = GLib.timeout_add(

2114

value, self.start_checker)

2115

self.start_checker() # Start one now, too

2116

2117

# Checker - property

2118

@dbus_service_property(_interface,

2119

signature="s",

2120

access="readwrite")

2121

def Checker_dbus_property(self, value=None):

2122

if value is None: # get

2123

return dbus.String(self.checker_command)

2124

self.checker_command = str(value)

2125

2126

# CheckerRunning - property

2127

@dbus_service_property(_interface,

2128

signature="b",

2129

access="readwrite")

2130

def CheckerRunning_dbus_property(self, value=None):

2131

if value is None: # get

2132

return dbus.Boolean(self.checker is not None)

2133

if value:

2134

self.start_checker()

2135

else:

2136

self.stop_checker()

2137

2138

# ObjectPath - property

2139

@dbus_annotations(

2140

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

2141

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

2142

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

2143

def ObjectPath_dbus_property(self):

2144

return self.dbus_object_path # is already a dbus.ObjectPath

2145

2146

# Secret = property

2147

@dbus_annotations(

2148

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

2149

"invalidates"})

2150

@dbus_service_property(_interface,

2151

signature="ay",

2152

access="write",

2153

byte_arrays=True)

2154

def Secret_dbus_property(self, value):

2155

self.secret = bytes(value)

2156

2157

del _interface

2158

2159

2160

class ProxyClient(object):

2161

def __init__(self, child_pipe, fpr, address):

2162

self._pipe = child_pipe

2163

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

2164

if not self._pipe.recv():

2165

raise KeyError(fpr)

2166

2167

def __getattribute__(self, name):

2168

if name == '_pipe':

2169

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

2170

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

2171

data = self._pipe.recv()

2172

if data[0] == 'data':

2173

return data[1]

2174

if data[0] == 'function':

2175

2176

def func(*args, **kwargs):

2177

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

2178

return self._pipe.recv()[1]

2179

2180

return func

2181

2182

def __setattr__(self, name, value):

2183

if name == '_pipe':

2184

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

2185

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

2186

2187

2188

class ClientHandler(socketserver.BaseRequestHandler, object):

2189

"""A class to handle client connections.

2190

2191

Instantiated once for each connection to handle it.

2192

Note: This will run in its own forked process."""

2193

2194

def handle(self):

2195

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

2196

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

2197

str(self.client_address))

2198

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

2199

self.server.child_pipe.fileno())

2200

2201

session = gnutls.ClientSession(self.request)

2202

2203

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

2204

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

2205

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

2206

# "+DHE-DSS"))

2207

# Use a fallback default, since this MUST be set.

2208

priority = self.server.gnutls_priority

2209

if priority is None:

2210

priority = "NORMAL"

2211

gnutls.priority_set_direct(session._c_object,

2212

priority.encode("utf-8"),

2213

None)

2214

2215

# Start communication using the Mandos protocol

2216

# Get protocol number

2217

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

2218

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

2219

try:

2220

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

2221

raise RuntimeError(line)

2222

except (ValueError, IndexError, RuntimeError) as error:

2223

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

2224

return

2225

2226

# Start GnuTLS connection

2227

try:

2228

session.handshake()

2229

except gnutls.Error as error:

2230

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

2231

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

2232

# established. Just abandon the request.

2233

return

2234

logger.debug("Handshake succeeded")

2235

2236

approval_required = False

2237

try:

2238

try:

2239

fpr = self.fingerprint(

2240

self.peer_certificate(session))

2241

except (TypeError, gnutls.Error) as error:

2242

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

2243

return

2244

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

2245

2246

try:

2247

client = ProxyClient(child_pipe, fpr,

2248

self.client_address)

2249

except KeyError:

2250

return

2251

2252

if client.approval_delay:

2253

delay = client.approval_delay

2254

client.approvals_pending += 1

2255

approval_required = True

2256

2257

while True:

2258

if not client.enabled:

2259

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

2260

client.name)

2261

if self.server.use_dbus:

2262

# Emit D-Bus signal

2263

client.Rejected("Disabled")

2264

return

2265

2266

if client.approved or not client.approval_delay:

2267

# We are approved or approval is disabled

2268

break

2269

elif client.approved is None:

2270

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

2271

client.name)

2272

if self.server.use_dbus:

2273

# Emit D-Bus signal

2274

client.NeedApproval(

2275

client.approval_delay.total_seconds()

2276

* 1000, client.approved_by_default)

2277

else:

2278

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

2279

client.name)

2280

if self.server.use_dbus:

2281

# Emit D-Bus signal

2282

client.Rejected("Denied")

2283

return

2284

2285

# wait until timeout or approved

2286

time = datetime.datetime.now()

2287

client.changedstate.acquire()

2288

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

2289

client.changedstate.release()

2290

time2 = datetime.datetime.now()

2291

if (time2 - time) >= delay:

2292

if not client.approved_by_default:

2293

logger.warning("Client %s timed out while"

2294

" waiting for approval",

2295

client.name)

2296

if self.server.use_dbus:

2297

# Emit D-Bus signal

2298

client.Rejected("Approval timed out")

2299

return

2300

else:

2301

break

2302

else:

2303

delay -= time2 - time

2304

2305

try:

2306

session.send(client.secret)

2307

except gnutls.Error as error:

2308

logger.warning("gnutls send failed",

2309

exc_info=error)

2310

return

2311

2312

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

2313

# bump the timeout using extended_timeout

2314

client.bump_timeout(client.extended_timeout)

2315

if self.server.use_dbus:

2316

# Emit D-Bus signal

2317

client.GotSecret()

2318

2319

finally:

2320

if approval_required:

2321

client.approvals_pending -= 1

2322

try:

2323

session.bye()

2324

except gnutls.Error as error:

2325

logger.warning("GnuTLS bye failed",

2326

exc_info=error)

2327

2328

@staticmethod

2329

def peer_certificate(session):

2330

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

2331

# If not an OpenPGP certificate...

2332

if (gnutls.certificate_type_get(session._c_object)

2333

!= gnutls.CRT_OPENPGP):

2334

# ...return invalid data

2335

return b""

2336

list_size = ctypes.c_uint(1)

2337

cert_list = (gnutls.certificate_get_peers

2338

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

2339

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

2340

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

2341

if list_size.value == 0:

2342

return None

2343

cert = cert_list[0]

2344

return ctypes.string_at(cert.data, cert.size)

2345

2346

@staticmethod

2347

def fingerprint(openpgp):

2348

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

2349

# New GnuTLS "datum" with the OpenPGP public key

2350

datum = gnutls.datum_t(

2351

ctypes.cast(ctypes.c_char_p(openpgp),

2352

ctypes.POINTER(ctypes.c_ubyte)),

2353

ctypes.c_uint(len(openpgp)))

2354

# New empty GnuTLS certificate

2355

crt = gnutls.openpgp_crt_t()

2356

gnutls.openpgp_crt_init(ctypes.byref(crt))

2357

# Import the OpenPGP public key into the certificate

2358

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

2359

gnutls.OPENPGP_FMT_RAW)

2360

# Verify the self signature in the key

2361

crtverify = ctypes.c_uint()

2362

gnutls.openpgp_crt_verify_self(crt, 0,

2363

ctypes.byref(crtverify))

2364

if crtverify.value != 0:

2365

gnutls.openpgp_crt_deinit(crt)

2366

raise gnutls.CertificateSecurityError("Verify failed")

2367

# New buffer for the fingerprint

2368

buf = ctypes.create_string_buffer(20)

2369

buf_len = ctypes.c_size_t()

2370

# Get the fingerprint from the certificate into the buffer

2371

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

2372

ctypes.byref(buf_len))

2373

# Deinit the certificate

2374

gnutls.openpgp_crt_deinit(crt)

2375

# Convert the buffer to a Python bytestring

2376

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

2377

# Convert the bytestring to hexadecimal notation

2378

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

2379

return hex_fpr

2380

2381

2382

class MultiprocessingMixIn(object):

2383

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

2384

2385

def sub_process_main(self, request, address):

2386

try:

2387

self.finish_request(request, address)

2388

except Exception:

2389

self.handle_error(request, address)

2390

self.close_request(request)

2391

2392

def process_request(self, request, address):

2393

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

2394

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

2395

args=(request, address))

2396

proc.start()

2397

return proc

2398

2399

2400

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

2401

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

2402

2403

def process_request(self, request, client_address):

2404

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

2405

2406

This function creates a new pipe in self.pipe

2407

"""

2408

parent_pipe, self.child_pipe = multiprocessing.Pipe()

2409

2410

proc = MultiprocessingMixIn.process_request(self, request,

2411

client_address)

2412

self.child_pipe.close()

2413

self.add_pipe(parent_pipe, proc)

2414

2415

def add_pipe(self, parent_pipe, proc):

2416

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

2417

raise NotImplementedError()

2418

2419

2420

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

2421

socketserver.TCPServer, object):

2422

"""IPv6-capable TCP server. Accepts 'None' as address and/or port

2423

2424

Attributes:

2425

enabled: Boolean; whether this server is activated yet

2426

interface: None or a network interface name (string)

2427

use_ipv6: Boolean; to use IPv6 or not

2428

"""

2429

2430

def __init__(self, server_address, RequestHandlerClass,

2431

interface=None,

2432

use_ipv6=True,

2433

socketfd=None):

2434

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

2435

creating a new one with socket.socket().

2436

"""

2437

self.interface = interface

2438

if use_ipv6:

2439

self.address_family = socket.AF_INET6

2440

if socketfd is not None:

2441

# Save the file descriptor

2442

self.socketfd = socketfd

2443

# Save the original socket.socket() function

2444

self.socket_socket = socket.socket

2445

2446

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

2447

#

2448

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

2449

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

2450

# patching socket.socket.)

2451

#

2452

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

2453

@functools.wraps(socket.socket)

2454

def socket_wrapper(*args, **kwargs):

2455

# Restore original function so subsequent calls are

2456

# not affected.

2457

socket.socket = self.socket_socket

2458

del self.socket_socket

2459

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

2460

# saved file descriptor.

2461

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

2462

# Replace socket.socket() function with wrapper

2463

socket.socket = socket_wrapper

2464

# The socketserver.TCPServer.__init__ will call

2465

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

2466

# socket_wrapper(), if socketfd was set.

2467

socketserver.TCPServer.__init__(self, server_address,

2468

RequestHandlerClass)

2469

2470

def server_bind(self):

2471

"""This overrides the normal server_bind() function

2472

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

2473

bind to an address or port if they were not specified."""

2474

global SO_BINDTODEVICE

2475

if self.interface is not None:

2476

if SO_BINDTODEVICE is None:

2477

# Fall back to a hard-coded value which seems to be

2478

# common enough.

2479

logger.warning("SO_BINDTODEVICE not found, trying 25")

2480

SO_BINDTODEVICE = 25

2481

try:

2482

self.socket.setsockopt(

2483

socket.SOL_SOCKET, SO_BINDTODEVICE,

2484

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

2485

except socket.error as error:

2486

if error.errno == errno.EPERM:

2487

logger.error("No permission to bind to"

2488

" interface %s", self.interface)

2489

elif error.errno == errno.ENOPROTOOPT:

2490

logger.error("SO_BINDTODEVICE not available;"

2491

" cannot bind to interface %s",

2492

self.interface)

2493

elif error.errno == errno.ENODEV:

2494

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

2495

" cannot bind", self.interface)

2496

else:

2497

raise

2498

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

2499

if self.server_address[0] or self.server_address[1]:

2500

if not self.server_address[0]:

2501

if self.address_family == socket.AF_INET6:

2502

any_address = "::" # in6addr_any

2503

else:

2504

any_address = "0.0.0.0" # INADDR_ANY

2505

self.server_address = (any_address,

2506

self.server_address[1])

2507

elif not self.server_address[1]:

2508

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

2509

# if self.interface:

2510

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

2511

# 0, # port

2512

# 0, # flowinfo

2513

# if_nametoindex

2514

# (self.interface))

2515

return socketserver.TCPServer.server_bind(self)

2516

2517

2518

class MandosServer(IPv6_TCPServer):

2519

"""Mandos server.

2520

2521

Attributes:

2522

clients: set of Client objects

2523

gnutls_priority GnuTLS priority string

2524

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

2525

2526

Assumes a GLib.MainLoop event loop.

2527

"""

2528

2529

def __init__(self, server_address, RequestHandlerClass,

2530

interface=None,

2531

use_ipv6=True,

2532

clients=None,

2533

gnutls_priority=None,

2534

use_dbus=True,

2535

socketfd=None):

2536

self.enabled = False

2537

self.clients = clients

2538

if self.clients is None:

2539

self.clients = {}

2540

self.use_dbus = use_dbus

2541

self.gnutls_priority = gnutls_priority

2542

IPv6_TCPServer.__init__(self, server_address,

2543

RequestHandlerClass,

2544

interface=interface,

2545

use_ipv6=use_ipv6,

2546

socketfd=socketfd)

2547

2548

def server_activate(self):

2549

if self.enabled:

2550

return socketserver.TCPServer.server_activate(self)

2551

2552

def enable(self):

2553

self.enabled = True

2554

2555

def add_pipe(self, parent_pipe, proc):

2556

# Call "handle_ipc" for both data and EOF events

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

2564

def handle_ipc(self, source, condition,

2565

parent_pipe=None,

2566

proc=None,

2567

client_object=None):

2568

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

2569

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

2570

# Wait for other process to exit

2571

proc.join()

2572

return False

2573

2574

# Read a request from the child

2575

request = parent_pipe.recv()

2576

command = request[0]

2577

2578

if command == 'init':

2579

fpr = request[1]

2580

address = request[2]

2581

2582

for c in self.clients.values():

2583

if c.fingerprint == fpr:

2584

client = c

2585

break

2586

else:

2587

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

2588

"dress: %s", fpr, address)

2589

if self.use_dbus:

2590

# Emit D-Bus signal

2591

mandos_dbus_service.ClientNotFound(fpr,

2592

address[0])

2593

parent_pipe.send(False)

2594

return False

2595

2596

GLib.io_add_watch(

2597

parent_pipe.fileno(),

2598

GLib.IO_IN | GLib.IO_HUP,

2599

functools.partial(self.handle_ipc,

2600

parent_pipe=parent_pipe,

2601

proc=proc,

2602

client_object=client))

2603

parent_pipe.send(True)

2604

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

2605

# same fileno

2606

return False

2607

if command == 'funcall':

2608

funcname = request[1]

2609

args = request[2]

2610

kwargs = request[3]

2611

2612

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

2613

funcname)(*args,

2614

**kwargs)))

2615

2616

if command == 'getattr':

2617

attrname = request[1]

2618

if isinstance(client_object.__getattribute__(attrname),

2619

collections.Callable):

2620

parent_pipe.send(('function', ))

2621

else:

2622

parent_pipe.send((

2623

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

2624

2625

if command == 'setattr':

2626

attrname = request[1]

2627

value = request[2]

2628

setattr(client_object, attrname, value)

2629

2630

return True

2631

2632

2633

def rfc3339_duration_to_delta(duration):

2634

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

2635

2636

>>> rfc3339_duration_to_delta("P7D")

2637

datetime.timedelta(7)

2638

>>> rfc3339_duration_to_delta("PT60S")

2639

datetime.timedelta(0, 60)

2640

>>> rfc3339_duration_to_delta("PT60M")

2641

datetime.timedelta(0, 3600)

2642

>>> rfc3339_duration_to_delta("PT24H")

2643

datetime.timedelta(1)

2644

>>> rfc3339_duration_to_delta("P1W")

2645

datetime.timedelta(7)

2646

>>> rfc3339_duration_to_delta("PT5M30S")

2647

datetime.timedelta(0, 330)

2648

>>> rfc3339_duration_to_delta("P1DT3M20S")

2649

datetime.timedelta(1, 200)

2650

"""

2651

2652

# Parsing an RFC 3339 duration with regular expressions is not

2653

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

2654

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

2655

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

2656

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

2657

# avoid excessive use of external libraries.

2658

2659

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

2660

Token = collections.namedtuple("Token", (

2661

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

2662

# a "group" containing digits

2663

"value", # datetime.timedelta or None

2664

"followers")) # Tokens valid after this token

2665

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

2666

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

2667

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

2668

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

2669

datetime.timedelta(seconds=1),

2670

frozenset((token_end, )))

2671

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

2672

datetime.timedelta(minutes=1),

2673

frozenset((token_second, token_end)))

2674

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

2675

datetime.timedelta(hours=1),

2676

frozenset((token_minute, token_end)))

2677

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

2678

None,

2679

frozenset((token_hour, token_minute,

2680

token_second)))

2681

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

2682

datetime.timedelta(days=1),

2683

frozenset((token_time, token_end)))

2684

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

2685

datetime.timedelta(weeks=4),

2686

frozenset((token_day, token_end)))

2687

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

2688

datetime.timedelta(weeks=52),

2689

frozenset((token_month, token_end)))

2690

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

2691

datetime.timedelta(weeks=1),

2692

frozenset((token_end, )))

2693

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

2694

frozenset((token_year, token_month,

2695

token_day, token_time,

2696

token_week)))

2697

# Define starting values:

2698

# Value so far

2699

value = datetime.timedelta()

2700

found_token = None

2701

# Following valid tokens

2702

followers = frozenset((token_duration, ))

2703

# String left to parse

2704

s = duration

2705

# Loop until end token is found

2706

while found_token is not token_end:

2707

# Search for any currently valid tokens

2708

for token in followers:

2709

match = token.regexp.match(s)

2710

if match is not None:

2711

# Token found

2712

if token.value is not None:

2713

# Value found, parse digits

2714

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

2715

# Add to value so far

2716

value += factor * token.value

2717

# Strip token from string

2718

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

2719

# Go to found token

2720

found_token = token

2721

# Set valid next tokens

2722

followers = found_token.followers

2723

break

2724

else:

2725

# No currently valid tokens were found

2726

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

2727

.format(duration))

2728

# End token found

2729

return value

2730

2731

2732

def string_to_delta(interval):

2733

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

2734

2735

>>> string_to_delta('7d')

2736

datetime.timedelta(7)

2737

>>> string_to_delta('60s')

2738

datetime.timedelta(0, 60)

2739

>>> string_to_delta('60m')

2740

datetime.timedelta(0, 3600)

2741

>>> string_to_delta('24h')

2742

datetime.timedelta(1)

2743

>>> string_to_delta('1w')

2744

datetime.timedelta(7)

2745

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

2746

datetime.timedelta(0, 330)

2747

"""

2748

2749

try:

2750

return rfc3339_duration_to_delta(interval)

2751

except ValueError:

2752

pass

2753

2754

timevalue = datetime.timedelta(0)

2755

for s in interval.split():

2756

try:

2757

suffix = s[-1]

2758

value = int(s[:-1])

2759

if suffix == "d":

2760

delta = datetime.timedelta(value)

2761

elif suffix == "s":

2762

delta = datetime.timedelta(0, value)

2763

elif suffix == "m":

2764

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

2765

elif suffix == "h":

2766

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

2767

elif suffix == "w":

2768

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

2769

else:

2770

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

2771

except IndexError as e:

2772

raise ValueError(*(e.args))

2773

timevalue += delta

2774

return timevalue

2775

2776

2777

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

2778

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

2779

2780

This should really exist as os.daemon, but it doesn't (yet)."""

2781

if os.fork():

2782

sys.exit()

2783

os.setsid()

2784

if not nochdir:

2785

os.chdir("/")

2786

if os.fork():

2787

sys.exit()

2788

if not noclose:

2789

# Close all standard open file descriptors

2790

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

2791

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

2792

raise OSError(errno.ENODEV,

2793

"{} not a character device"

2794

.format(os.devnull))

2795

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

2796

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

2797

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

2798

if null > 2:

2799

os.close(null)

2800

2801

2802

def main():

2803

2804

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

2805

# Parsing of options, both command line and config file

2806

2807

parser = argparse.ArgumentParser()

2808

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

2809

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

2810

help="show version number and exit")

2811

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

2812

help="Bind to interface IF")

2813

parser.add_argument("-a", "--address",

2814

help="Address to listen for requests on")

2815

parser.add_argument("-p", "--port", type=int,

2816

help="Port number to receive requests on")

2817

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

2818

help="Run self-test")

2819

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

2820

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

2821

" to terminal", default=None)

2822

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

2823

help="Debug level for stdout output")

2824

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

2825

" priority string (see GnuTLS documentation)")

2826

parser.add_argument("--servicename",

2827

metavar="NAME", help="Zeroconf service name")

2828

parser.add_argument("--configdir",

2829

default="/etc/mandos", metavar="DIR",

2830

help="Directory to search for configuration"

2831

" files")

2832

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

2833

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

2834

" system bus interface", default=None)

2835

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

2836

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

2837

default=None)

2838

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

2839

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

2840

" state", default=None)

2841

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

2842

help="Specify a file descriptor to a network"

2843

" socket to use instead of creating one")

2844

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

2845

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

2846

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

2847

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

2848

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

2849

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

2850

default=None)

2851

2852

options = parser.parse_args()

2853

2854

if options.check:

2855

import doctest

2856

fail_count, test_count = doctest.testmod()

2857

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

2858

2859

# Default values for config file for server-global settings

2860

server_defaults = {"interface": "",

2861

"address": "",

2862

"port": "",

2863

"debug": "False",

2864

"priority":

2865

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

2866

":+SIGN-DSA-SHA256",

2867

"servicename": "Mandos",

2868

"use_dbus": "True",

2869

"use_ipv6": "True",

2870

"debuglevel": "",

2871

"restore": "True",

2872

"socket": "",

2873

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

2874

"foreground": "False",

2875

"zeroconf": "True",

2876

}

2877

2878

# Parse config file for server-global settings

2879

server_config = configparser.SafeConfigParser(server_defaults)

2880

del server_defaults

2881

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

2882

# Convert the SafeConfigParser object to a dict

2883

server_settings = server_config.defaults()

2884

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

2885

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

2886

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

2887

option)

2888

if server_settings["port"]:

2889

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

2890

"port")

2891

if server_settings["socket"]:

2892

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

2893

"socket")

2894

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

2895

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

2896

# happen with a supplied network socket.

2897

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

2898

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

2899

["socket"])

2900

del server_config

2901

2902

# Override the settings from the config file with command line

2903

# options, if set.

2904

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

2905

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

2906

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

2907

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

2908

value = getattr(options, option)

2909

if value is not None:

2910

server_settings[option] = value

2911

del options

2912

# Force all strings to be unicode

2913

for option in server_settings.keys():

2914

if isinstance(server_settings[option], bytes):

2915

server_settings[option] = (server_settings[option]

2916

.decode("utf-8"))

2917

# Force all boolean options to be boolean

2918

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

2919

"foreground", "zeroconf"):

2920

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

2921

# Debug implies foreground

2922

if server_settings["debug"]:

2923

server_settings["foreground"] = True

2924

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

2925

2926

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

2927

2928

if (not server_settings["zeroconf"]

2929

and not (server_settings["port"]

2930

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

2931

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

2932

2933

# For convenience

2934

debug = server_settings["debug"]

2935

debuglevel = server_settings["debuglevel"]

2936

use_dbus = server_settings["use_dbus"]

2937

use_ipv6 = server_settings["use_ipv6"]

2938

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

2939

stored_state_file)

2940

foreground = server_settings["foreground"]

2941

zeroconf = server_settings["zeroconf"]

2942

2943

if debug:

2944

initlogger(debug, logging.DEBUG)

2945

else:

2946

if not debuglevel:

2947

initlogger(debug)

2948

else:

2949

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

2950

initlogger(debug, level)

2951

2952

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

2953

syslogger.setFormatter(

2954

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

2955

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

2956

server_settings["servicename"])))

2957

2958

# Parse config file with clients

2959

client_config = configparser.SafeConfigParser(Client

2960

.client_defaults)

2961

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

2962

"clients.conf"))

2963

2964

global mandos_dbus_service

2965

mandos_dbus_service = None

2966

2967

socketfd = None

2968

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

2969

socketfd = server_settings["socket"]

2970

tcp_server = MandosServer(

2971

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

2972

ClientHandler,

2973

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

2974

use_ipv6=use_ipv6,

2975

gnutls_priority=server_settings["priority"],

2976

use_dbus=use_dbus,

2977

socketfd=socketfd)

2978

if not foreground:

2979

pidfilename = "/run/mandos.pid"

2980

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

2981

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

2982

pidfile = None

2983

try:

2984

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

2985

except IOError as e:

2986

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

2987

exc_info=e)

2988

2989

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

2990

("mandos", "mandos"),

2991

("nobody", "nogroup")):

2992

try:

2993

uid = pwd.getpwnam(name).pw_uid

2994

gid = pwd.getpwnam(group).pw_gid

2995

break

2996

except KeyError:

2997

continue

2998

else:

2999

uid = 65534

3000

gid = 65534

3001

try:

3002

os.setgid(gid)

3003

os.setuid(uid)

3004

if debug:

3005

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

3006

gid))

3007

except OSError as error:

3008

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

3009

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

3010

if error.errno != errno.EPERM:

3011

raise

3012

3013

if debug:

3014

# Enable all possible GnuTLS debugging

3015

3016

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

3017

# - GnuTLS manual

3018

gnutls.global_set_log_level(11)

3019

3020

@gnutls.log_func

3021

def debug_gnutls(level, string):

3022

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

3023

3024

gnutls.global_set_log_function(debug_gnutls)

3025

3026

# Redirect stdin so all checkers get /dev/null

3027

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

3028

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

3029

if null > 2:

3030

os.close(null)

3031

3032

# Need to fork before connecting to D-Bus

3033

if not foreground:

3034

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

3035

daemon()

3036

3037

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

3038

# to inform GLib that threads will be used.

3039

GLib.threads_init()

3040

3041

global main_loop

3042

# From the Avahi example code

3043

DBusGMainLoop(set_as_default=True)

3044

main_loop = GLib.MainLoop()

3045

bus = dbus.SystemBus()

3046

# End of Avahi example code

3047

if use_dbus:

3048

try:

3049

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

3050

bus,

3051

do_not_queue=True)

3052

old_bus_name = dbus.service.BusName(

3053

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

3054

do_not_queue=True)

3055

except dbus.exceptions.DBusException as e:

3056

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

3057

use_dbus = False

3058

server_settings["use_dbus"] = False

3059

tcp_server.use_dbus = False

3060

if zeroconf:

3061

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

3062

service = AvahiServiceToSyslog(

3063

name=server_settings["servicename"],

3064

servicetype="_mandos._tcp",

3065

protocol=protocol,

3066

bus=bus)

3067

if server_settings["interface"]:

3068

service.interface = if_nametoindex(

3069

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

3070

3071

global multiprocessing_manager

3072

multiprocessing_manager = multiprocessing.Manager()

3073

3074

client_class = Client

3075

if use_dbus:

3076

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

3077

3078

client_settings = Client.config_parser(client_config)

3079

old_client_settings = {}

3080

clients_data = {}

3081

3082

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

3083

global wnull

3084

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

3085

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

3086

# mode

3087

if debug or not foreground:

3088

wnull.close()

3089

3090

# Get client data and settings from last running state.

3091

if server_settings["restore"]:

3092

try:

3093

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

3094

if sys.version_info.major == 2:

3095

clients_data, old_client_settings = pickle.load(

3096

stored_state)

3097

else:

3098

bytes_clients_data, bytes_old_client_settings = (

3099

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

3100

# Fix bytes to strings

3101

# clients_data

3102

# .keys()

3103

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

3104

if isinstance(key, bytes)

3105

else key): value

3106

for key, value in

3107

bytes_clients_data.items()}

3108

del bytes_clients_data

3109

for key in clients_data:

3110

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

3111

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

3112

for k, v in

3113

clients_data[key].items()}

3114

clients_data[key] = value

3115

# .client_structure

3116

value["client_structure"] = [

3117

(s.decode("utf-8")

3118

if isinstance(s, bytes)

3119

else s) for s in

3120

value["client_structure"]]

3121

# .name & .host

3122

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

3123

if isinstance(value[k], bytes):

3124

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

3125

# old_client_settings

3126

# .keys()

3127

old_client_settings = {

3128

(key.decode("utf-8")

3129

if isinstance(key, bytes)

3130

else key): value

3131

for key, value in

3132

bytes_old_client_settings.items()}

3133

del bytes_old_client_settings

3134

# .host

3135

for value in old_client_settings.values():

3136

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

3137

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

3138

.decode("utf-8"))

3139

os.remove(stored_state_path)

3140

except IOError as e:

3141

if e.errno == errno.ENOENT:

3142

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

3143

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

3144

else:

3145

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

3146

exc_info=e)

3147

raise

3148

except EOFError as e:

3149

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

3150

"EOFError:",

3151

exc_info=e)

3152

3153

with PGPEngine() as pgp:

3154

for client_name, client in clients_data.items():

3155

# Skip removed clients

3156

if client_name not in client_settings:

3157

continue

3158

3159

# Decide which value to use after restoring saved state.

3160

# We have three different values: Old config file,

3161

# new config file, and saved state.

3162

# New config value takes precedence if it differs from old

3163

# config value, otherwise use saved state.

3164

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

3165

try:

3166

# For each value in new config, check if it

3167

# differs from the old config value (Except for

3168

# the "secret" attribute)

3169

if (name != "secret"

3170

and (value !=

3171

old_client_settings[client_name][name])):

3172

client[name] = value

3173

except KeyError:

3174

pass

3175

3176

# Clients who has passed its expire date can still be

3177

# enabled if its last checker was successful. A Client

3178

# whose checker succeeded before we stored its state is

3179

# assumed to have successfully run all checkers during

3180

# downtime.

3181

if client["enabled"]:

3182

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

3183

if not client["last_checked_ok"]:

3184

logger.warning(

3185

"disabling client {} - Client never "

3186

"performed a successful checker".format(

3187

client_name))

3188

client["enabled"] = False

3189

elif client["last_checker_status"] != 0:

3190

logger.warning(

3191

"disabling client {} - Client last"

3192

" checker failed with error code"

3193

" {}".format(

3194

client_name,

3195

client["last_checker_status"]))

3196

client["enabled"] = False

3197

else:

3198

client["expires"] = (

3199

datetime.datetime.utcnow()

3200

+ client["timeout"])

3201

logger.debug("Last checker succeeded,"

3202

" keeping {} enabled".format(

3203

client_name))

3204

try:

3205

client["secret"] = pgp.decrypt(

3206

client["encrypted_secret"],

3207

client_settings[client_name]["secret"])

3208

except PGPError:

3209

# If decryption fails, we use secret from new settings

3210

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

3211

client_name))

3212

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

3213

["secret"])

3214

3215

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

3216

for client_name in (set(old_client_settings)

3217

- set(client_settings)):

3218

del clients_data[client_name]

3219

for client_name in (set(client_settings)

3220

- set(old_client_settings)):

3221

clients_data[client_name] = client_settings[client_name]

3222

3223

# Create all client objects

3224

for client_name, client in clients_data.items():

3225

tcp_server.clients[client_name] = client_class(

3226

name=client_name,

3227

settings=client,

3228

server_settings=server_settings)

3229

3230

if not tcp_server.clients:

3231

logger.warning("No clients defined")

3232

3233

if not foreground:

3234

if pidfile is not None:

3235

pid = os.getpid()

3236

try:

3237

with pidfile:

3238

print(pid, file=pidfile)

3239

except IOError:

3240

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

3241

pidfilename, pid)

3242

del pidfile

3243

del pidfilename

3244

3245

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

3246

GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,

3247

lambda: main_loop.quit() and False)

3248

3249

if use_dbus:

3250

3251

@alternate_dbus_interfaces(

3252

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

3253

class MandosDBusService(DBusObjectWithObjectManager):

3254

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

3255

3256

def __init__(self):

3257

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

3258

3259

_interface = "se.recompile.Mandos"

3260

3261

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

3262

def ClientAdded(self, objpath):

3263

"D-Bus signal"

3264

pass

3265

3266

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

3267

def ClientNotFound(self, fingerprint, address):

3268

"D-Bus signal"

3269

pass

3270

3271

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

3272

"true"})

3273

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

3274

def ClientRemoved(self, objpath, name):

3275

"D-Bus signal"

3276

pass

3277

3278

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

3279

"true"})

3280

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

3281

def GetAllClients(self):

3282

"D-Bus method"

3283

return dbus.Array(c.dbus_object_path for c in

3284

tcp_server.clients.values())

3285

3286

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

3287

"true"})

3288

@dbus.service.method(_interface,

3289

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

3290

def GetAllClientsWithProperties(self):

3291

"D-Bus method"

3292

return dbus.Dictionary(

3293

{c.dbus_object_path: c.GetAll(

3294

"se.recompile.Mandos.Client")

3295

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

3296

signature="oa{sv}")

3297

3298

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

3299

def RemoveClient(self, object_path):

3300

"D-Bus method"

3301

for c in tcp_server.clients.values():

3302

if c.dbus_object_path == object_path:

3303

del tcp_server.clients[c.name]

3304

c.remove_from_connection()

3305

# Don't signal the disabling

3306

c.disable(quiet=True)

3307

# Emit D-Bus signal for removal

3308

self.client_removed_signal(c)

3309

return

3310

raise KeyError(object_path)

3311

3312

del _interface

3313

3314

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

3315

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

3316

def GetManagedObjects(self):

3317

"""D-Bus method"""

3318

return dbus.Dictionary(

3319

{client.dbus_object_path:

3320

dbus.Dictionary(

3321

{interface: client.GetAll(interface)

3322

for interface in

3323

client._get_all_interface_names()})

3324

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

3325

3326

def client_added_signal(self, client):

3327

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

3328

if use_dbus:

3329

# New standard signal

3330

self.InterfacesAdded(

3331

client.dbus_object_path,

3332

dbus.Dictionary(

3333

{interface: client.GetAll(interface)

3334

for interface in

3335

client._get_all_interface_names()}))

3336

# Old signal

3337

self.ClientAdded(client.dbus_object_path)

3338

3339

def client_removed_signal(self, client):

3340

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

3341

if use_dbus:

3342

# New standard signal

3343

self.InterfacesRemoved(

3344

client.dbus_object_path,

3345

client._get_all_interface_names())

3346

# Old signal

3347

self.ClientRemoved(client.dbus_object_path,

3348

client.name)

3349

3350

mandos_dbus_service = MandosDBusService()

3351

3352

# Save modules to variables to exempt the modules from being

3353

# unloaded before the function registered with atexit() is run.

3354

mp = multiprocessing

3355

wn = wnull

3356

3357

def cleanup():

3358

"Cleanup function; run on exit"

3359

if zeroconf:

3360

service.cleanup()

3361

3362

mp.active_children()

3363

wn.close()

3364

if not (tcp_server.clients or client_settings):

3365

return

3366

3367

# Store client before exiting. Secrets are encrypted with key

3368

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

3369

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

3370

clients = {}

3371

with PGPEngine() as pgp:

3372

for client in tcp_server.clients.values():

3373

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

3374

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

3375

key)

3376

client_dict = {}

3377

3378

# A list of attributes that can not be pickled

3379

# + secret.

3380

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

3381

"checker", "server_settings"}

3382

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

3383

.Object):

3384

exclude.add(name)

3385

3386

client_dict["encrypted_secret"] = (client

3387

.encrypted_secret)

3388

for attr in client.client_structure:

3389

if attr not in exclude:

3390

client_dict[attr] = getattr(client, attr)

3391

3392

clients[client.name] = client_dict

3393

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

3394

3395

try:

3396

with tempfile.NamedTemporaryFile(

3397

mode='wb',

3398

suffix=".pickle",

3399

prefix='clients-',

3400

dir=os.path.dirname(stored_state_path),

3401

delete=False) as stored_state:

3402

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

3403

protocol=2)

3404

tempname = stored_state.name

3405

os.rename(tempname, stored_state_path)

3406

except (IOError, OSError) as e:

3407

if not debug:

3408

try:

3409

os.remove(tempname)

3410

except NameError:

3411

pass

3412

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

3413

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

3414

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

3415

else:

3416

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

3417

exc_info=e)

3418

raise

3419

3420

# Delete all clients, and settings from config

3421

while tcp_server.clients:

3422

name, client = tcp_server.clients.popitem()

3423

if use_dbus:

3424

client.remove_from_connection()

3425

# Don't signal the disabling

3426

client.disable(quiet=True)

3427

# Emit D-Bus signal for removal

3428

if use_dbus:

3429

mandos_dbus_service.client_removed_signal(client)

3430

client_settings.clear()

3431

3432

atexit.register(cleanup)

3433

3434

for client in tcp_server.clients.values():

3435

if use_dbus:

3436

# Emit D-Bus signal for adding

3437

mandos_dbus_service.client_added_signal(client)

3438

# Need to initiate checking of clients

3439

if client.enabled:

3440

client.init_checker()

3441

3442

tcp_server.enable()

3443

tcp_server.server_activate()

3444

3445

# Find out what port we got

3446

if zeroconf:

3447

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

3448

if use_ipv6:

3449

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

3450

" flowinfo %d, scope_id %d",

3451

*tcp_server.socket.getsockname())

3452

else: # IPv4

3453

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

3454

*tcp_server.socket.getsockname())

3455

3456

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

3457

3458

try:

3459

if zeroconf:

3460

# From the Avahi example code

3461

try:

3462

service.activate()

3463

except dbus.exceptions.DBusException as error:

3464

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

3465

cleanup()

3466

sys.exit(1)

3467

# End of Avahi example code

3468

3469

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

3470

lambda *args, **kwargs:

3471

(tcp_server.handle_request

3472

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

3473

3474

logger.debug("Starting main loop")

3475

main_loop.run()

3476

except AvahiError as error:

3477

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

3478

cleanup()

3479

sys.exit(1)

3480

except KeyboardInterrupt:

3481

if debug:

3482

print("", file=sys.stderr)

3483

logger.debug("Server received KeyboardInterrupt")

3484

logger.debug("Server exiting")

3485

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

3486

cleanup()

3487

3488

3489

if __name__ == '__main__':

3490

main()