/mandos/release : revision 237.7.392

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

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#

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# Everything else is

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#

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

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

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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import SocketServer as socketserver

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try:

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from future_builtins import *

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except ImportError:

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pass

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try:

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import SocketServer as socketserver

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except ImportError:

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import socketserver

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import socket

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import argparse

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import datetime

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import errno

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import gnutls.crypto

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import gnutls.connection

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import gnutls.errors

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import gnutls.library.functions

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import gnutls.library.constants

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import gnutls.library.types

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import ConfigParser as configparser

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try:

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import ConfigParser as configparser

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except ImportError:

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import configparser

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import sys

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import re

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import os

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import struct

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import fcntl

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import functools

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import cPickle as pickle

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try:

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import cPickle as pickle

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except ImportError:

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import pickle

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import multiprocessing

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import types

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import binascii

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import tempfile

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import itertools

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import collections

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import codecs

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import dbus

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import dbus.service

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import gobject

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import avahi

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from gi.repository import GLib

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from dbus.mainloop.glib import DBusGMainLoop

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import ctypes

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import ctypes.util

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except ImportError:

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SO_BINDTODEVICE = None

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if sys.version_info.major == 2:

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str = unicode

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version = "1.4.1"

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version = "1.7.7"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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console.setFormatter(logging.Formatter('%(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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syslogger = None

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try:

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if_nametoindex = ctypes.cdll.LoadLibrary(

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

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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

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

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

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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struct.pack(b"16s16x", interface))

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

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return interface_index

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def copy_function(func):

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

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if sys.version_info.major == 2:

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return types.FunctionType(func.func_code,

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func.func_globals,

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func.func_name,

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func.func_defaults,

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func.func_closure)

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else:

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return types.FunctionType(func.__code__,

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func.__globals__,

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func.__name__,

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func.__defaults__,

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func.__closure__)

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def initlogger(debug, level=logging.WARNING):

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"""init logger and add loglevel"""

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global syslogger

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syslogger = (logging.handlers.SysLogHandler(

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facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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address = "/dev/log"))

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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console.setFormatter(logging.Formatter('%(asctime)s %(name)s'

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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"""Exception if encryption/decryption fails"""

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pass

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class PGPEngine(object):

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"""A simple class for OpenPGP symmetric encryption & decryption"""

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def __init__(self):

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self.tempdir = tempfile.mkdtemp(prefix="mandos-")

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self.gpg = "gpg"

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try:

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

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for line in output.splitlines():

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

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if name == "gpg":

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self.gpg = path

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break

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except OSError as e:

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if e.errno != errno.ENOENT:

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raise

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self.gnupgargs = ['--batch',

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'--homedir', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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def __enter__(self):

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return self

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

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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for root, dirs, files in os.walk(self.tempdir,

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topdown = False):

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for filename in files:

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os.remove(os.path.join(root, filename))

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for dirname in dirs:

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os.rmdir(os.path.join(root, dirname))

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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# Passphrase can not be empty and can not contain newlines or

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# NUL bytes. So we prefix it and hex encode it.

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encoded = b"mandos" + binascii.hexlify(password)

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if len(encoded) > 2048:

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# GnuPG can't handle long passwords, so encode differently

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encoded = (b"mandos" + password.replace(b"\\", b"\\\\")

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.replace(b"\n", b"\\n")

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

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return encoded

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def encrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(

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dir=self.tempdir) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(

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dir = self.tempdir) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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# Pretend that we have an Avahi module

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class Avahi(object):

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

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

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

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

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PROTO_INET = 0 # avahi-common/address.h

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PROTO_INET6 = 1 # avahi-common/address.h

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DBUS_NAME = "org.freedesktop.Avahi"

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DBUS_INTERFACE_ENTRY_GROUP = DBUS_NAME + ".EntryGroup"

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DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"

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DBUS_PATH_SERVER = "/"

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def string_array_to_txt_array(self, t):

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

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

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ENTRY_GROUP_ESTABLISHED = 2 # avahi-common/defs.h

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ENTRY_GROUP_COLLISION = 3 # avahi-common/defs.h

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ENTRY_GROUP_FAILURE = 4 # avahi-common/defs.h

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SERVER_INVALID = 0 # avahi-common/defs.h

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SERVER_REGISTERING = 1 # avahi-common/defs.h

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SERVER_RUNNING = 2 # avahi-common/defs.h

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SERVER_COLLISION = 3 # avahi-common/defs.h

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SERVER_FAILURE = 4 # avahi-common/defs.h

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avahi = Avahi()

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class AvahiError(Exception):

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

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self.value = value

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

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def __unicode__(self):

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return unicode(repr(self.value))

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

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**kwargs)

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class AvahiServiceError(AvahiError):

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pass

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class AvahiGroupError(AvahiError):

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pass

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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protocol = avahi.PROTO_UNSPEC, bus = None):

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def __init__(self,

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interface = avahi.IF_UNSPEC,

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name = None,

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servicetype = None,

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port = None,

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TXT = None,

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domain = "",

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host = "",

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max_renames = 32768,

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protocol = avahi.PROTO_UNSPEC,

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bus = None):

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self.interface = interface

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self.name = name

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self.type = servicetype

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

157

def rename(self):

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def rename(self, remove=True):

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

159

345

if self.rename_count >= self.max_renames:

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

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" after %i retries, exiting.",

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self.rename_count)

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raise AvahiServiceError("Too many renames")

164

self.name = unicode(self.server

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.GetAlternativeServiceName(self.name))

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self.name = str(

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self.server.GetAlternativeServiceName(self.name))

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self.rename_count += 1

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

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self.name)

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self.remove()

355

if remove:

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self.remove()

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try:

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self.add()

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359

except dbus.exceptions.DBusException as error:

172

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

173

self.cleanup()

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os._exit(1)

175

self.rename_count += 1

360

if (error.get_dbus_name()

361

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

362

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

363

return self.rename(remove=False)

364

else:

365

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

366

self.cleanup()

367

os._exit(1)

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def remove(self):

177

370

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

178

371

if self.entry_group_state_changed_match is not None:

180

373

self.entry_group_state_changed_match = None

181

374

if self.group is not None:

182

375

self.group.Reset()

376

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def add(self):

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378

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

185

379

self.remove()

202

396

dbus.UInt16(self.port),

203

397

avahi.string_array_to_txt_array(self.TXT))

204

398

self.group.Commit()

399

205

400

def entry_group_state_changed(self, state, error):

206

401

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

207

402

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

213

408

self.rename()

214

409

elif state == avahi.ENTRY_GROUP_FAILURE:

215

410

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

216

unicode(error))

217

raise AvahiGroupError("State changed: %s"

218

% unicode(error))

411

str(error))

412

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

413

219

414

def cleanup(self):

220

415

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

221

416

if self.group is not None:

222

417

try:

223

418

self.group.Free()

224

419

except (dbus.exceptions.UnknownMethodException,

225

dbus.exceptions.DBusException) as e:

420

dbus.exceptions.DBusException):

226

421

pass

227

422

self.group = None

228

423

self.remove()

424

229

425

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

230

426

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

231

427

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

232

bad_states = { avahi.SERVER_INVALID:

233

"Zeroconf server invalid",

234

avahi.SERVER_REGISTERING: None,

235

avahi.SERVER_COLLISION:

236

"Zeroconf server name collision",

237

avahi.SERVER_FAILURE:

238

"Zeroconf server failure" }

428

bad_states = {

429

avahi.SERVER_INVALID: "Zeroconf server invalid",

430

avahi.SERVER_REGISTERING: None,

431

avahi.SERVER_COLLISION: "Zeroconf server name collision",

432

avahi.SERVER_FAILURE: "Zeroconf server failure",

433

}

239

434

if state in bad_states:

240

435

if bad_states[state] is not None:

241

436

if error is None:

244

439

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

245

440

self.cleanup()

246

441

elif state == avahi.SERVER_RUNNING:

247

self.add()

442

try:

443

self.add()

444

except dbus.exceptions.DBusException as error:

445

if (error.get_dbus_name()

446

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

447

logger.info("Local Zeroconf service name"

448

" collision.")

449

return self.rename(remove=False)

450

else:

451

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

452

self.cleanup()

453

os._exit(1)

248

454

else:

249

455

if error is None:

250

456

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

251

457

else:

252

458

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

459

253

460

def activate(self):

254

461

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

255

462

if self.server is None:

259

466

follow_name_owner_changes=True),

260

467

avahi.DBUS_INTERFACE_SERVER)

261

468

self.server.connect_to_signal("StateChanged",

262

self.server_state_changed)

469

self.server_state_changed)

263

470

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

264

471

472

265

473

class AvahiServiceToSyslog(AvahiService):

266

def rename(self):

474

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

267

475

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

268

ret = AvahiService.rename(self)

269

syslogger.setFormatter(logging.Formatter

270

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

271

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

272

% self.name))

476

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

477

syslogger.setFormatter(logging.Formatter(

478

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

479

.format(self.name)))

273

480

return ret

274

481

275

def _timedelta_to_milliseconds(td):

276

"Convert a datetime.timedelta() to milliseconds"

277

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

278

+ (td.seconds * 1000)

279

+ (td.microseconds // 1000))

280

482

# Pretend that we have a GnuTLS module

483

class GnuTLS(object):

484

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

485

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

486

487

_library = ctypes.cdll.LoadLibrary(

488

ctypes.util.find_library("gnutls"))

489

_need_version = b"3.3.0"

490

def __init__(self):

491

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

492

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

493

# happens.

494

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

495

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

496

.format(self._need_version))

497

498

# Unless otherwise indicated, the constants and types below are

499

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

500

501

# Constants

502

E_SUCCESS = 0

503

E_INTERRUPTED = -52

504

E_AGAIN = -28

505

CRT_OPENPGP = 2

506

CLIENT = 2

507

SHUT_RDWR = 0

508

CRD_CERTIFICATE = 1

509

E_NO_CERTIFICATE_FOUND = -49

510

OPENPGP_FMT_RAW = 0 # gnutls/openpgp.h

511

512

# Types

513

class session_int(ctypes.Structure):

514

_fields_ = []

515

session_t = ctypes.POINTER(session_int)

516

class certificate_credentials_st(ctypes.Structure):

517

_fields_ = []

518

certificate_credentials_t = ctypes.POINTER(

519

certificate_credentials_st)

520

certificate_type_t = ctypes.c_int

521

class datum_t(ctypes.Structure):

522

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

523

('size', ctypes.c_uint)]

524

class openpgp_crt_int(ctypes.Structure):

525

_fields_ = []

526

openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)

527

openpgp_crt_fmt_t = ctypes.c_int # gnutls/openpgp.h

528

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

529

credentials_type_t = ctypes.c_int

530

transport_ptr_t = ctypes.c_void_p

531

close_request_t = ctypes.c_int

532

533

# Exceptions

534

class Error(Exception):

535

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

536

# exception might be raised from within GnuTLS.__init__,

537

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

538

# global variable has happened.

539

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

540

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

541

# code is passed, convert it to a string with

542

# gnutls.strerror()

543

self.code = code

544

if message is None and code is not None:

545

message = GnuTLS.strerror(code)

546

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

547

message, *args)

548

549

class CertificateSecurityError(Error):

550

pass

551

552

# Classes

553

class Credentials(object):

554

def __init__(self):

555

self._c_object = gnutls.certificate_credentials_t()

556

gnutls.certificate_allocate_credentials(

557

ctypes.byref(self._c_object))

558

self.type = gnutls.CRD_CERTIFICATE

559

560

def __del__(self):

561

gnutls.certificate_free_credentials(self._c_object)

562

563

class ClientSession(object):

564

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

565

self._c_object = gnutls.session_t()

566

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

567

gnutls.set_default_priority(self._c_object)

568

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

569

gnutls.handshake_set_private_extensions(self._c_object,

570

True)

571

self.socket = socket

572

if credentials is None:

573

credentials = gnutls.Credentials()

574

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

575

ctypes.cast(credentials._c_object,

576

ctypes.c_void_p))

577

self.credentials = credentials

578

579

def __del__(self):

580

gnutls.deinit(self._c_object)

581

582

def handshake(self):

583

return gnutls.handshake(self._c_object)

584

585

def send(self, data):

586

data = bytes(data)

587

data_len = len(data)

588

while data_len > 0:

589

data_len -= gnutls.record_send(self._c_object,

590

data[-data_len:],

591

data_len)

592

593

def bye(self):

594

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

595

596

# Error handling functions

597

def _error_code(result):

598

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

599

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

600

if result >= 0:

601

return result

602

if result == gnutls.E_NO_CERTIFICATE_FOUND:

603

raise gnutls.CertificateSecurityError(code = result)

604

raise gnutls.Error(code = result)

605

606

def _retry_on_error(result, func, arguments):

607

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

608

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

609

while result < 0:

610

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

611

return _error_code(result)

612

result = func(*arguments)

613

return result

614

615

# Unless otherwise indicated, the function declarations below are

616

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

617

618

# Functions

619

priority_set_direct = _library.gnutls_priority_set_direct

620

priority_set_direct.argtypes = [session_t, ctypes.c_char_p,

621

ctypes.POINTER(ctypes.c_char_p)]

622

priority_set_direct.restype = _error_code

623

624

init = _library.gnutls_init

625

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

626

init.restype = _error_code

627

628

set_default_priority = _library.gnutls_set_default_priority

629

set_default_priority.argtypes = [session_t]

630

set_default_priority.restype = _error_code

631

632

record_send = _library.gnutls_record_send

633

record_send.argtypes = [session_t, ctypes.c_void_p,

634

ctypes.c_size_t]

635

record_send.restype = ctypes.c_ssize_t

636

record_send.errcheck = _retry_on_error

637

638

certificate_allocate_credentials = (

639

_library.gnutls_certificate_allocate_credentials)

640

certificate_allocate_credentials.argtypes = [

641

ctypes.POINTER(certificate_credentials_t)]

642

certificate_allocate_credentials.restype = _error_code

643

644

certificate_free_credentials = (

645

_library.gnutls_certificate_free_credentials)

646

certificate_free_credentials.argtypes = [certificate_credentials_t]

647

certificate_free_credentials.restype = None

648

649

handshake_set_private_extensions = (

650

_library.gnutls_handshake_set_private_extensions)

651

handshake_set_private_extensions.argtypes = [session_t,

652

ctypes.c_int]

653

handshake_set_private_extensions.restype = None

654

655

credentials_set = _library.gnutls_credentials_set

656

credentials_set.argtypes = [session_t, credentials_type_t,

657

ctypes.c_void_p]

658

credentials_set.restype = _error_code

659

660

strerror = _library.gnutls_strerror

661

strerror.argtypes = [ctypes.c_int]

662

strerror.restype = ctypes.c_char_p

663

664

certificate_type_get = _library.gnutls_certificate_type_get

665

certificate_type_get.argtypes = [session_t]

666

certificate_type_get.restype = _error_code

667

668

certificate_get_peers = _library.gnutls_certificate_get_peers

669

certificate_get_peers.argtypes = [session_t,

670

ctypes.POINTER(ctypes.c_uint)]

671

certificate_get_peers.restype = ctypes.POINTER(datum_t)

672

673

global_set_log_level = _library.gnutls_global_set_log_level

674

global_set_log_level.argtypes = [ctypes.c_int]

675

global_set_log_level.restype = None

676

677

global_set_log_function = _library.gnutls_global_set_log_function

678

global_set_log_function.argtypes = [log_func]

679

global_set_log_function.restype = None

680

681

deinit = _library.gnutls_deinit

682

deinit.argtypes = [session_t]

683

deinit.restype = None

684

685

handshake = _library.gnutls_handshake

686

handshake.argtypes = [session_t]

687

handshake.restype = _error_code

688

handshake.errcheck = _retry_on_error

689

690

transport_set_ptr = _library.gnutls_transport_set_ptr

691

transport_set_ptr.argtypes = [session_t, transport_ptr_t]

692

transport_set_ptr.restype = None

693

694

bye = _library.gnutls_bye

695

bye.argtypes = [session_t, close_request_t]

696

bye.restype = _error_code

697

bye.errcheck = _retry_on_error

698

699

check_version = _library.gnutls_check_version

700

check_version.argtypes = [ctypes.c_char_p]

701

check_version.restype = ctypes.c_char_p

702

703

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

704

705

openpgp_crt_init = _library.gnutls_openpgp_crt_init

706

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

707

openpgp_crt_init.restype = _error_code

708

709

openpgp_crt_import = _library.gnutls_openpgp_crt_import

710

openpgp_crt_import.argtypes = [openpgp_crt_t,

711

ctypes.POINTER(datum_t),

712

openpgp_crt_fmt_t]

713

openpgp_crt_import.restype = _error_code

714

715

openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self

716

openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,

717

ctypes.POINTER(ctypes.c_uint)]

718

openpgp_crt_verify_self.restype = _error_code

719

720

openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit

721

openpgp_crt_deinit.argtypes = [openpgp_crt_t]

722

openpgp_crt_deinit.restype = None

723

724

openpgp_crt_get_fingerprint = (

725

_library.gnutls_openpgp_crt_get_fingerprint)

726

openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,

727

ctypes.c_void_p,

728

ctypes.POINTER(

729

ctypes.c_size_t)]

730

openpgp_crt_get_fingerprint.restype = _error_code

731

732

# Remove non-public functions

733

del _error_code, _retry_on_error

734

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

735

gnutls = GnuTLS()

736

737

def call_pipe(connection, # : multiprocessing.Connection

738

func, *args, **kwargs):

739

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

740

741

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

742

return value on the provided multiprocessing.Connection.

743

"""

744

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

745

connection.close()

746

281

747

class Client(object):

282

748

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

283

749

284

750

Attributes:

285

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

751

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

286

752

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

287

753

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

288

754

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

289

755

to see if the client lives.

290

756

'None' if no process is running.

291

checker_callback_tag: a gobject event source tag, or None

757

checker_callback_tag: a GLib event source tag, or None

292

758

checker_command: string; External command which is run to check

293

759

if client lives. %() expansions are done at

294

760

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

295

761

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

296

checker_initiator_tag: a gobject event source tag, or None

762

checker_initiator_tag: a GLib event source tag, or None

297

763

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

764

client_structure: Object describing what attributes a client has

765

and is used for storing the client at exit

298

766

current_checker_command: string; current running checker_command

299

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

300

disable_initiator_tag: a gobject event source tag, or None

767

disable_initiator_tag: a GLib event source tag, or None

301

768

enabled: bool()

302

769

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

303

770

uniquely identify the client

305

772

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

306

773

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

307

774

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

308

last_enabled: datetime.datetime(); (UTC)

775

last_checker_status: integer between 0 and 255 reflecting exit

776

status of last checker. -1 reflects crashed

777

checker, -2 means no checker completed yet.

778

last_checker_signal: The signal which killed the last checker, if

779

last_checker_status is -1

780

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

309

781

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

310

782

D-Bus identifiers

311

783

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

312

784

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

313

785

until this client is disabled

314

extended_timeout: extra long timeout when password has been sent

786

extended_timeout: extra long timeout when secret has been sent

315

787

runtime_expansions: Allowed attributes for runtime expansion.

316

788

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

317

789

disabled, or None

790

server_settings: The server_settings dict from main()

318

791

"""

319

792

320

793

runtime_expansions = ("approval_delay", "approval_duration",

321

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

322

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

794

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

795

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

796

"last_approval_request", "last_checked_ok",

323

797

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

324

325

def timeout_milliseconds(self):

326

"Return the 'timeout' attribute in milliseconds"

327

return _timedelta_to_milliseconds(self.timeout)

328

329

def extended_timeout_milliseconds(self):

330

"Return the 'extended_timeout' attribute in milliseconds"

331

return _timedelta_to_milliseconds(self.extended_timeout)

332

333

def interval_milliseconds(self):

334

"Return the 'interval' attribute in milliseconds"

335

return _timedelta_to_milliseconds(self.interval)

336

337

def approval_delay_milliseconds(self):

338

return _timedelta_to_milliseconds(self.approval_delay)

339

340

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

341

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

342

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

343

attribute."""

798

client_defaults = {

799

"timeout": "PT5M",

800

"extended_timeout": "PT15M",

801

"interval": "PT2M",

802

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

803

"host": "",

804

"approval_delay": "PT0S",

805

"approval_duration": "PT1S",

806

"approved_by_default": "True",

807

"enabled": "True",

808

}

809

810

@staticmethod

811

def config_parser(config):

812

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

813

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

814

with exceptions for any special settings as defined above.

815

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

816

value given the same arguments.

817

"""

818

settings = {}

819

for client_name in config.sections():

820

section = dict(config.items(client_name))

821

client = settings[client_name] = {}

822

823

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

824

# Reformat values from string types to Python types

825

client["approved_by_default"] = config.getboolean(

826

client_name, "approved_by_default")

827

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

828

"enabled")

829

830

# Uppercase and remove spaces from fingerprint for later

831

# comparison purposes with return value from the

832

# fingerprint() function

833

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

834

.replace(" ", ""))

835

if "secret" in section:

836

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

837

.encode("utf-8"),

838

"base64")

839

elif "secfile" in section:

840

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

841

(section["secfile"])),

842

"rb") as secfile:

843

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

844

else:

845

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

846

.format(section))

847

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

848

client["extended_timeout"] = string_to_delta(

849

section["extended_timeout"])

850

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

851

client["approval_delay"] = string_to_delta(

852

section["approval_delay"])

853

client["approval_duration"] = string_to_delta(

854

section["approval_duration"])

855

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

856

client["last_approval_request"] = None

857

client["last_checked_ok"] = None

858

client["last_checker_status"] = -2

859

860

return settings

861

862

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

344

863

self.name = name

345

if config is None:

346

config = {}

864

if server_settings is None:

865

server_settings = {}

866

self.server_settings = server_settings

867

# adding all client settings

868

for setting, value in settings.items():

869

setattr(self, setting, value)

870

871

if self.enabled:

872

if not hasattr(self, "last_enabled"):

873

self.last_enabled = datetime.datetime.utcnow()

874

if not hasattr(self, "expires"):

875

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

876

+ self.timeout)

877

else:

878

self.last_enabled = None

879

self.expires = None

880

347

881

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

348

# Uppercase and remove spaces from fingerprint for later

349

# comparison purposes with return value from the fingerprint()

350

# function

351

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

352

.replace(" ", ""))

353

882

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

354

if "secret" in config:

355

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

356

elif "secfile" in config:

357

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

358

(config["secfile"])),

359

"rb") as secfile:

360

self.secret = secfile.read()

361

else:

362

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

363

% self.name)

364

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

365

self.created = datetime.datetime.utcnow()

366

self.enabled = False

367

self.last_approval_request = None

368

self.last_enabled = None

369

self.last_checked_ok = None

370

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

371

self.extended_timeout = string_to_delta(config

372

["extended_timeout"])

373

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

374

self.disable_hook = disable_hook

883

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

884

datetime.datetime.utcnow())

885

886

# attributes specific for this server instance

375

887

self.checker = None

376

888

self.checker_initiator_tag = None

377

889

self.disable_initiator_tag = None

378

self.expires = None

379

890

self.checker_callback_tag = None

380

self.checker_command = config["checker"]

381

891

self.current_checker_command = None

382

self.last_connect = None

383

self._approved = None

384

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

385

True)

892

self.approved = None

386

893

self.approvals_pending = 0

387

self.approval_delay = string_to_delta(

388

config["approval_delay"])

389

self.approval_duration = string_to_delta(

390

config["approval_duration"])

391

self.changedstate = (multiprocessing_manager

392

.Condition(multiprocessing_manager

393

.Lock()))

894

self.changedstate = multiprocessing_manager.Condition(

895

multiprocessing_manager.Lock())

896

self.client_structure = [attr

897

for attr in self.__dict__.keys()

898

if not attr.startswith("_")]

899

self.client_structure.append("client_structure")

900

901

for name, t in inspect.getmembers(

902

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

903

if not name.startswith("_"):

904

self.client_structure.append(name)

394

905

906

# Send notice to process children that client state has changed

395

907

def send_changedstate(self):

396

self.changedstate.acquire()

397

self.changedstate.notify_all()

398

self.changedstate.release()

908

with self.changedstate:

909

self.changedstate.notify_all()

399

910

400

911

def enable(self):

401

912

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

402

913

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

403

914

# Already enabled

404

915

return

405

self.send_changedstate()

406

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

407

# and every interval from then on.

408

self.checker_initiator_tag = (gobject.timeout_add

409

(self.interval_milliseconds(),

410

self.start_checker))

411

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

412

916

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

413

self.disable_initiator_tag = (gobject.timeout_add

414

(self.timeout_milliseconds(),

415

self.disable))

416

917

self.enabled = True

417

918

self.last_enabled = datetime.datetime.utcnow()

418

# Also start a new checker *right now*.

419

self.start_checker()

919

self.init_checker()

920

self.send_changedstate()

420

921

421

922

def disable(self, quiet=True):

422

923

"""Disable this client."""

423

924

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

424

925

return False

425

926

if not quiet:

426

self.send_changedstate()

427

if not quiet:

428

927

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

429

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

430

gobject.source_remove(self.disable_initiator_tag)

928

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

929

GLib.source_remove(self.disable_initiator_tag)

431

930

self.disable_initiator_tag = None

432

931

self.expires = None

433

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

434

gobject.source_remove(self.checker_initiator_tag)

932

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

933

GLib.source_remove(self.checker_initiator_tag)

435

934

self.checker_initiator_tag = None

436

935

self.stop_checker()

437

if self.disable_hook:

438

self.disable_hook(self)

439

936

self.enabled = False

440

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

937

if not quiet:

938

self.send_changedstate()

939

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

441

940

return False

442

941

443

942

def __del__(self):

444

self.disable_hook = None

445

943

self.disable()

446

944

447

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

945

def init_checker(self):

946

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

947

# and every interval from then on.

948

if self.checker_initiator_tag is not None:

949

GLib.source_remove(self.checker_initiator_tag)

950

self.checker_initiator_tag = GLib.timeout_add(

951

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

952

self.start_checker)

953

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

954

if self.disable_initiator_tag is not None:

955

GLib.source_remove(self.disable_initiator_tag)

956

self.disable_initiator_tag = GLib.timeout_add(

957

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

958

# Also start a new checker *right now*.

959

self.start_checker()

960

961

def checker_callback(self, source, condition, connection,

962

command):

448

963

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

449

964

self.checker_callback_tag = None

450

965

self.checker = None

451

if os.WIFEXITED(condition):

452

exitstatus = os.WEXITSTATUS(condition)

453

if exitstatus == 0:

966

# Read return code from connection (see call_pipe)

967

returncode = connection.recv()

968

connection.close()

969

970

if returncode >= 0:

971

self.last_checker_status = returncode

972

self.last_checker_signal = None

973

if self.last_checker_status == 0:

454

974

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

455

975

vars(self))

456

976

self.checked_ok()

457

977

else:

458

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

459

vars(self))

978

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

460

979

else:

980

self.last_checker_status = -1

981

self.last_checker_signal = -returncode

461

982

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

462

983

vars(self))

463

464

def checked_ok(self, timeout=None):

465

"""Bump up the timeout for this client.

466

467

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

468

alive and well.

469

"""

984

return False

985

986

def checked_ok(self):

987

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

988

self.last_checked_ok = datetime.datetime.utcnow()

989

self.last_checker_status = 0

990

self.last_checker_signal = None

991

self.bump_timeout()

992

993

def bump_timeout(self, timeout=None):

994

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

470

995

if timeout is None:

471

996

timeout = self.timeout

472

self.last_checked_ok = datetime.datetime.utcnow()

473

997

if self.disable_initiator_tag is not None:

474

gobject.source_remove(self.disable_initiator_tag)

998

GLib.source_remove(self.disable_initiator_tag)

999

self.disable_initiator_tag = None

475

1000

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

476

self.disable_initiator_tag = (gobject.timeout_add

477

(_timedelta_to_milliseconds

478

(timeout), self.disable))

1001

self.disable_initiator_tag = GLib.timeout_add(

1002

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

479

1003

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

480

1004

481

1005

def need_approval(self):

487

1011

If a checker already exists, leave it running and do

488

1012

nothing."""

489

1013

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

490

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

491

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

492

# client would inevitably timeout, since no checker would get

493

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

1014

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

1015

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

1016

# would inevitably timeout, since no checker would get a

1017

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

494

1018

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

495

1019

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

496

1020

# should be.

497

1021

498

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

499

try:

500

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

501

except (AttributeError, OSError) as error:

502

if (isinstance(error, OSError)

503

and error.errno != errno.ECHILD):

504

raise error

505

else:

506

if pid:

507

logger.warning("Checker was a zombie")

508

gobject.source_remove(self.checker_callback_tag)

509

self.checker_callback(pid, status,

510

self.current_checker_command)

1022

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

1023

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

1024

self.checker.join()

1025

self.checker = None

511

1026

# Start a new checker if needed

512

1027

if self.checker is None:

1028

# Escape attributes for the shell

1029

escaped_attrs = {

1030

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

1031

for attr in self.runtime_expansions }

513

1032

try:

514

# In case checker_command has exactly one % operator

515

command = self.checker_command % self.host

516

except TypeError:

517

# Escape attributes for the shell

518

escaped_attrs = dict(

519

(attr,

520

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

521

errors=

522

'replace')))

523

for attr in

524

self.runtime_expansions)

525

526

try:

527

command = self.checker_command % escaped_attrs

528

except TypeError as error:

529

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

530

' %s', self.checker_command, error)

531

return True # Try again later

1033

command = self.checker_command % escaped_attrs

1034

except TypeError as error:

1035

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

1036

self.checker_command,

1037

exc_info=error)

1038

return True # Try again later

532

1039

self.current_checker_command = command

533

try:

534

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

535

command, self.name)

536

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

537

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

538

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

539

# always replaced by /dev/null.)

540

self.checker = subprocess.Popen(command,

541

close_fds=True,

542

shell=True, cwd="/")

543

self.checker_callback_tag = (gobject.child_watch_add

544

(self.checker.pid,

545

self.checker_callback,

546

data=command))

547

# The checker may have completed before the gobject

548

# watch was added. Check for this.

549

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

550

if pid:

551

gobject.source_remove(self.checker_callback_tag)

552

self.checker_callback(pid, status, command)

553

except OSError as error:

554

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

555

error)

556

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

1040

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

1041

self.name)

1042

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

1043

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

1044

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

1045

# always replaced by /dev/null.)

1046

# The exception is when not debugging but nevertheless

1047

# running in the foreground; use the previously

1048

# created wnull.

1049

popen_args = { "close_fds": True,

1050

"shell": True,

1051

"cwd": "/" }

1052

if (not self.server_settings["debug"]

1053

and self.server_settings["foreground"]):

1054

popen_args.update({"stdout": wnull,

1055

"stderr": wnull })

1056

pipe = multiprocessing.Pipe(duplex = False)

1057

self.checker = multiprocessing.Process(

1058

target = call_pipe,

1059

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

1060

kwargs = popen_args)

1061

self.checker.start()

1062

self.checker_callback_tag = GLib.io_add_watch(

1063

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

1064

self.checker_callback, pipe[0], command)

1065

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

557

1066

return True

558

1067

559

1068

def stop_checker(self):

560

1069

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

561

1070

if self.checker_callback_tag:

562

gobject.source_remove(self.checker_callback_tag)

1071

GLib.source_remove(self.checker_callback_tag)

563

1072

self.checker_callback_tag = None

564

1073

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

565

1074

return

566

1075

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

567

try:

568

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

569

#time.sleep(0.5)

570

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

571

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

572

except OSError as error:

573

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

574

raise

1076

self.checker.terminate()

575

1077

self.checker = None

576

1078

577

1079

578

def dbus_service_property(dbus_interface, signature="v",

579

access="readwrite", byte_arrays=False):

1080

def dbus_service_property(dbus_interface,

1081

signature="v",

1082

access="readwrite",

1083

byte_arrays=False):

580

1084

"""Decorators for marking methods of a DBusObjectWithProperties to

581

1085

become properties on the D-Bus.

582

1086

591

1095

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

592

1096

if byte_arrays and signature != "ay":

593

1097

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

594

" signature %r" % signature)

1098

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

1099

595

1100

def decorator(func):

596

1101

func._dbus_is_property = True

597

1102

func._dbus_interface = dbus_interface

602

1107

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

603

1108

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

604

1109

return func

1110

1111

return decorator

1112

1113

1114

def dbus_interface_annotations(dbus_interface):

1115

"""Decorator for marking functions returning interface annotations

1116

1117

Usage:

1118

1119

@dbus_interface_annotations("org.example.Interface")

1120

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

1121

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

1122

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

1123

"false"}

1124

"""

1125

1126

def decorator(func):

1127

func._dbus_is_interface = True

1128

func._dbus_interface = dbus_interface

1129

func._dbus_name = dbus_interface

1130

return func

1131

1132

return decorator

1133

1134

1135

def dbus_annotations(annotations):

1136

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

1137

Usage:

1138

1139

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

1140

"org.freedesktop.DBus.Property."

1141

"EmitsChangedSignal": "false"})

1142

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

1143

access="r")

1144

def Property_dbus_property(self):

1145

return dbus.Boolean(False)

1146

1147

See also the DBusObjectWithAnnotations class.

1148

"""

1149

1150

def decorator(func):

1151

func._dbus_annotations = annotations

1152

return func

1153

605

1154

return decorator

606

1155

607

1156

608

1157

class DBusPropertyException(dbus.exceptions.DBusException):

609

1158

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

610

1159

"""

611

def __unicode__(self):

612

return unicode(str(self))

1160

pass

613

1161

614

1162

615

1163

class DBusPropertyAccessException(DBusPropertyException):

624

1172

pass

625

1173

626

1174

627

class DBusObjectWithProperties(dbus.service.Object):

1175

class DBusObjectWithAnnotations(dbus.service.Object):

1176

"""A D-Bus object with annotations.

1177

1178

Classes inheriting from this can use the dbus_annotations

1179

decorator to add annotations to methods or signals.

1180

"""

1181

1182

@staticmethod

1183

def _is_dbus_thing(thing):

1184

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

1185

1186

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

1187

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

1188

"""

1189

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

1190

False)

1191

1192

def _get_all_dbus_things(self, thing):

1193

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

1194

"""

1195

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

1196

athing.__get__(self))

1197

for cls in self.__class__.__mro__

1198

for name, athing in

1199

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

1200

1201

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1202

out_signature = "s",

1203

path_keyword = 'object_path',

1204

connection_keyword = 'connection')

1205

def Introspect(self, object_path, connection):

1206

"""Overloading of standard D-Bus method.

1207

1208

Inserts annotation tags on methods and signals.

1209

"""

1210

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

1211

connection)

1212

try:

1213

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

1214

1215

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

1216

# Add annotation tags

1217

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

1218

for tag in if_tag.getElementsByTagName(typ):

1219

annots = dict()

1220

for name, prop in (self.

1221

_get_all_dbus_things(typ)):

1222

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

1223

and prop._dbus_interface

1224

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

1225

annots.update(getattr(

1226

prop, "_dbus_annotations", {}))

1227

for name, value in annots.items():

1228

ann_tag = document.createElement(

1229

"annotation")

1230

ann_tag.setAttribute("name", name)

1231

ann_tag.setAttribute("value", value)

1232

tag.appendChild(ann_tag)

1233

# Add interface annotation tags

1234

for annotation, value in dict(

1235

itertools.chain.from_iterable(

1236

annotations().items()

1237

for name, annotations

1238

in self._get_all_dbus_things("interface")

1239

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

1240

)).items():

1241

ann_tag = document.createElement("annotation")

1242

ann_tag.setAttribute("name", annotation)

1243

ann_tag.setAttribute("value", value)

1244

if_tag.appendChild(ann_tag)

1245

# Fix argument name for the Introspect method itself

1246

if (if_tag.getAttribute("name")

1247

== dbus.INTROSPECTABLE_IFACE):

1248

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

1249

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

1250

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

1251

if (arg.getAttribute("direction")

1252

== "out"):

1253

arg.setAttribute("name",

1254

"xml_data")

1255

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

1256

document.unlink()

1257

except (AttributeError, xml.dom.DOMException,

1258

xml.parsers.expat.ExpatError) as error:

1259

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

1260

exc_info=error)

1261

return xmlstring

1262

1263

1264

class DBusObjectWithProperties(DBusObjectWithAnnotations):

628

1265

"""A D-Bus object with properties.

629

1266

630

1267

Classes inheriting from this can use the dbus_service_property

632

1269

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

633

1270

"""

634

1271

635

@staticmethod

636

def _is_dbus_property(obj):

637

return getattr(obj, "_dbus_is_property", False)

638

639

def _get_all_dbus_properties(self):

640

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

641

"""

642

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

643

for cls in self.__class__.__mro__

644

for name, prop in

645

inspect.getmembers(cls, self._is_dbus_property))

646

647

1272

def _get_dbus_property(self, interface_name, property_name):

648

1273

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

649

1274

property with the specified name and interface.

650

1275

"""

651

for cls in self.__class__.__mro__:

652

for name, value in (inspect.getmembers

653

(cls, self._is_dbus_property)):

1276

for cls in self.__class__.__mro__:

1277

for name, value in inspect.getmembers(

1278

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

654

1279

if (value._dbus_name == property_name

655

1280

and value._dbus_interface == interface_name):

656

1281

return value.__get__(self)

657

1282

658

1283

# No such property

659

raise DBusPropertyNotFound(self.dbus_object_path + ":"

660

+ interface_name + "."

661

+ property_name)

662

663

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

1284

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

1285

self.dbus_object_path, interface_name, property_name))

1286

1287

@classmethod

1288

def _get_all_interface_names(cls):

1289

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

1290

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

1291

"_dbus_interface", None)

1292

for x in (inspect.getmro(cls))

1293

for attr in dir(x))

1294

if name is not None)

1295

1296

@dbus.service.method(dbus.PROPERTIES_IFACE,

1297

in_signature="ss",

664

1298

out_signature="v")

665

1299

def Get(self, interface_name, property_name):

666

1300

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

684

1318

# The byte_arrays option is not supported yet on

685

1319

# signatures other than "ay".

686

1320

if prop._dbus_signature != "ay":

687

raise ValueError

688

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

689

for byte in value))

1321

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

1322

"'ay' signature {!r}"

1323

.format(prop._dbus_signature))

1324

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

1325

for byte in value))

690

1326

prop(value)

691

1327

692

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

1328

@dbus.service.method(dbus.PROPERTIES_IFACE,

1329

in_signature="s",

693

1330

out_signature="a{sv}")

694

1331

def GetAll(self, interface_name):

695

1332

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

697

1334

698

1335

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

699

1336

"""

700

all = {}

701

for name, prop in self._get_all_dbus_properties():

1337

properties = {}

1338

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

702

1339

if (interface_name

703

1340

and interface_name != prop._dbus_interface):

704

1341

# Interface non-empty but did not match

708

1345

continue

709

1346

value = prop()

710

1347

if not hasattr(value, "variant_level"):

711

all[name] = value

1348

properties[name] = value

712

1349

continue

713

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

714

value.variant_level+1)

715

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

1350

properties[name] = type(value)(

1351

value, variant_level = value.variant_level + 1)

1352

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

1353

1354

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

1355

def PropertiesChanged(self, interface_name, changed_properties,

1356

invalidated_properties):

1357

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

1358

standard.

1359

"""

1360

pass

716

1361

717

1362

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

718

1363

out_signature="s",

719

1364

path_keyword='object_path',

720

1365

connection_keyword='connection')

721

1366

def Introspect(self, object_path, connection):

722

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

1367

"""Overloading of standard D-Bus method.

1368

1369

Inserts property tags and interface annotation tags.

723

1370

"""

724

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

725

connection)

1371

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1372

object_path,

1373

connection)

726

1374

try:

727

1375

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

1376

728

1377

def make_tag(document, name, prop):

729

1378

e = document.createElement("property")

730

1379

e.setAttribute("name", name)

731

1380

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

732

1381

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

733

1382

return e

1383

734

1384

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

1385

# Add property tags

735

1386

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

736

1387

for name, prop

737

in self._get_all_dbus_properties()

1388

in self._get_all_dbus_things("property")

738

1389

if prop._dbus_interface

739

1390

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

740

1391

if_tag.appendChild(tag)

1392

# Add annotation tags for properties

1393

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

1394

annots = dict()

1395

for name, prop in self._get_all_dbus_things(

1396

"property"):

1397

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

1398

and prop._dbus_interface

1399

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

1400

annots.update(getattr(

1401

prop, "_dbus_annotations", {}))

1402

for name, value in annots.items():

1403

ann_tag = document.createElement(

1404

"annotation")

1405

ann_tag.setAttribute("name", name)

1406

ann_tag.setAttribute("value", value)

1407

tag.appendChild(ann_tag)

741

1408

# Add the names to the return values for the

742

1409

# "org.freedesktop.DBus.Properties" methods

743

1410

if (if_tag.getAttribute("name")

758

1425

except (AttributeError, xml.dom.DOMException,

759

1426

xml.parsers.expat.ExpatError) as error:

760

1427

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

761

error)

762

return xmlstring

763

764

765

def datetime_to_dbus (dt, variant_level=0):

1428

exc_info=error)

1429

return xmlstring

1430

1431

try:

1432

dbus.OBJECT_MANAGER_IFACE

1433

except AttributeError:

1434

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

1435

1436

class DBusObjectWithObjectManager(DBusObjectWithAnnotations):

1437

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

1438

1439

Classes inheriting from this exposes the standard

1440

GetManagedObjects call and the InterfacesAdded and

1441

InterfacesRemoved signals on the standard

1442

"org.freedesktop.DBus.ObjectManager" interface.

1443

1444

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

1445

manually.

1446

"""

1447

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

1448

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

1449

def GetManagedObjects(self):

1450

"""This function must be overridden"""

1451

raise NotImplementedError()

1452

1453

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,

1454

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

1455

def InterfacesAdded(self, object_path, interfaces_and_properties):

1456

pass

1457

1458

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

1459

def InterfacesRemoved(self, object_path, interfaces):

1460

pass

1461

1462

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1463

out_signature = "s",

1464

path_keyword = 'object_path',

1465

connection_keyword = 'connection')

1466

def Introspect(self, object_path, connection):

1467

"""Overloading of standard D-Bus method.

1468

1469

Override return argument name of GetManagedObjects to be

1470

"objpath_interfaces_and_properties"

1471

"""

1472

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1473

object_path,

1474

connection)

1475

try:

1476

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

1477

1478

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

1479

# Fix argument name for the GetManagedObjects method

1480

if (if_tag.getAttribute("name")

1481

== dbus.OBJECT_MANAGER_IFACE):

1482

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

1483

if (cn.getAttribute("name")

1484

== "GetManagedObjects"):

1485

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

1486

if (arg.getAttribute("direction")

1487

== "out"):

1488

arg.setAttribute(

1489

"name",

1490

"objpath_interfaces"

1491

"_and_properties")

1492

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

1493

document.unlink()

1494

except (AttributeError, xml.dom.DOMException,

1495

xml.parsers.expat.ExpatError) as error:

1496

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

1497

exc_info = error)

1498

return xmlstring

1499

1500

def datetime_to_dbus(dt, variant_level=0):

766

1501

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

767

1502

if dt is None:

768

1503

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

769

return dbus.String(dt.isoformat(),

770

variant_level=variant_level)

771

772

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

773

.__metaclass__):

774

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

775

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

1504

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

1505

1506

1507

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1508

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

1509

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

1510

interface names according to the "alt_interface_names" mapping.

1511

Usage:

1512

1513

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

1514

"net.example.AlternateInterface"})

1515

class SampleDBusObject(dbus.service.Object):

1516

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

1517

def SampleDBusMethod():

1518

pass

1519

1520

The above "SampleDBusMethod" on "SampleDBusObject" will be

1521

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

1522

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

1523

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

1524

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

1525

1526

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

1527

(from DBusObjectWithProperties) and interfaces (from the

1528

dbus_interface_annotations decorator).

776

1529

"""

777

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

778

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

779

# methods, signals, or properties in them

780

for base in (b for b in bases

781

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

782

# Go though all attributes of the base class

783

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

1530

1531

def wrapper(cls):

1532

for orig_interface_name, alt_interface_name in (

1533

alt_interface_names.items()):

1534

attr = {}

1535

interface_names = set()

1536

# Go though all attributes of the class

1537

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

784

1538

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

785

1539

# with the wrong interface name

786

1540

if (not hasattr(attribute, "_dbus_interface")

787

or not attribute._dbus_interface

788

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

1541

or not attribute._dbus_interface.startswith(

1542

orig_interface_name)):

789

1543

continue

790

1544

# Create an alternate D-Bus interface name based on

791

1545

# the current name

792

alt_interface = (attribute._dbus_interface

793

.replace("se.recompile.Mandos",

794

"se.bsnet.fukt.Mandos"))

1546

alt_interface = attribute._dbus_interface.replace(

1547

orig_interface_name, alt_interface_name)

1548

interface_names.add(alt_interface)

795

1549

# Is this a D-Bus signal?

796

1550

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

797

# Extract the original non-method function by

798

# black magic

799

nonmethod_func = (dict(

1551

# Extract the original non-method undecorated

1552

# function by black magic

1553

if sys.version_info.major == 2:

1554

nonmethod_func = (dict(

800

1555

zip(attribute.func_code.co_freevars,

801

attribute.__closure__))["func"]

802

.cell_contents)

1556

attribute.__closure__))

1557

["func"].cell_contents)

1558

else:

1559

nonmethod_func = (dict(

1560

zip(attribute.__code__.co_freevars,

1561

attribute.__closure__))

1562

["func"].cell_contents)

803

1563

# Create a new, but exactly alike, function

804

1564

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

805

1565

# with the alternate D-Bus interface name

806

new_function = (dbus.service.signal

807

(alt_interface,

808

attribute._dbus_signature)

809

(types.FunctionType(

810

nonmethod_func.func_code,

811

nonmethod_func.func_globals,

812

nonmethod_func.func_name,

813

nonmethod_func.func_defaults,

814

nonmethod_func.func_closure)))

1566

new_function = copy_function(nonmethod_func)

1567

new_function = (dbus.service.signal(

1568

alt_interface,

1569

attribute._dbus_signature)(new_function))

1570

# Copy annotations, if any

1571

try:

1572

new_function._dbus_annotations = dict(

1573

attribute._dbus_annotations)

1574

except AttributeError:

1575

pass

815

1576

# Define a creator of a function to call both the

816

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

817

# signals gets sent when the function is called

1577

# original and alternate functions, so both the

1578

# original and alternate signals gets sent when

1579

# the function is called

818

1580

def fixscope(func1, func2):

819

1581

"""This function is a scope container to pass

820

1582

func1 and func2 to the "call_both" function

821

1583

outside of its arguments"""

1584

1585

@functools.wraps(func2)

822

1586

def call_both(*args, **kwargs):

823

1587

"""This function will emit two D-Bus

824

1588

signals by calling func1 and func2"""

825

1589

func1(*args, **kwargs)

826

1590

func2(*args, **kwargs)

1591

# Make wrapper function look like a D-Bus signal

1592

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

1593

if name.startswith("_dbus_"):

1594

setattr(call_both, name, attr)

1595

827

1596

return call_both

828

1597

# Create the "call_both" function and add it to

829

1598

# the class

830

attr[attrname] = fixscope(attribute,

831

new_function)

1599

attr[attrname] = fixscope(attribute, new_function)

832

1600

# Is this a D-Bus method?

833

1601

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

834

1602

# Create a new, but exactly alike, function

835

1603

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

836

1604

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

837

1605

# to the class.

838

attr[attrname] = (dbus.service.method

839

(alt_interface,

840

attribute._dbus_in_signature,

841

attribute._dbus_out_signature)

842

(types.FunctionType

843

(attribute.func_code,

844

attribute.func_globals,

845

attribute.func_name,

846

attribute.func_defaults,

847

attribute.func_closure)))

1606

attr[attrname] = (

1607

dbus.service.method(

1608

alt_interface,

1609

attribute._dbus_in_signature,

1610

attribute._dbus_out_signature)

1611

(copy_function(attribute)))

1612

# Copy annotations, if any

1613

try:

1614

attr[attrname]._dbus_annotations = dict(

1615

attribute._dbus_annotations)

1616

except AttributeError:

1617

pass

848

1618

# Is this a D-Bus property?

849

1619

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

850

1620

# Create a new, but exactly alike, function

851

1621

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

852

1622

# property with the alternate D-Bus interface

853

1623

# name. Add it to the class.

854

attr[attrname] = (dbus_service_property

855

(alt_interface,

856

attribute._dbus_signature,

857

attribute._dbus_access,

858

attribute

859

._dbus_get_args_options

860

["byte_arrays"])

861

(types.FunctionType

862

(attribute.func_code,

863

attribute.func_globals,

864

attribute.func_name,

865

attribute.func_defaults,

866

attribute.func_closure)))

867

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

868

1624

attr[attrname] = (dbus_service_property(

1625

alt_interface, attribute._dbus_signature,

1626

attribute._dbus_access,

1627

attribute._dbus_get_args_options

1628

["byte_arrays"])

1629

(copy_function(attribute)))

1630

# Copy annotations, if any

1631

try:

1632

attr[attrname]._dbus_annotations = dict(

1633

attribute._dbus_annotations)

1634

except AttributeError:

1635

pass

1636

# Is this a D-Bus interface?

1637

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

1638

# Create a new, but exactly alike, function

1639

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

1640

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

1641

# to the class.

1642

attr[attrname] = (

1643

dbus_interface_annotations(alt_interface)

1644

(copy_function(attribute)))

1645

if deprecate:

1646

# Deprecate all alternate interfaces

1647

iname="_AlternateDBusNames_interface_annotation{}"

1648

for interface_name in interface_names:

1649

1650

@dbus_interface_annotations(interface_name)

1651

def func(self):

1652

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

1653

"true" }

1654

# Find an unused name

1655

for aname in (iname.format(i)

1656

for i in itertools.count()):

1657

if aname not in attr:

1658

attr[aname] = func

1659

break

1660

if interface_names:

1661

# Replace the class with a new subclass of it with

1662

# methods, signals, etc. as created above.

1663

if sys.version_info.major == 2:

1664

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

1665

(cls, ), attr)

1666

else:

1667

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

1668

(cls, ), attr)

1669

return cls

1670

1671

return wrapper

1672

1673

1674

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

1675

"se.bsnet.fukt.Mandos"})

869

1676

class ClientDBus(Client, DBusObjectWithProperties):

870

1677

"""A Client class using D-Bus

871

1678

875

1682

"""

876

1683

877

1684

runtime_expansions = (Client.runtime_expansions

878

+ ("dbus_object_path",))

1685

+ ("dbus_object_path", ))

1686

1687

_interface = "se.recompile.Mandos.Client"

879

1688

880

1689

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

881

1690

882

1691

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

883

self._approvals_pending = 0

884

1692

self.bus = bus

885

1693

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

886

1694

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

887

1695

# the D-Bus

888

client_object_name = unicode(self.name).translate(

1696

client_object_name = str(self.name).translate(

889

1697

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

890

1698

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

891

self.dbus_object_path = (dbus.ObjectPath

892

("/clients/" + client_object_name))

1699

self.dbus_object_path = dbus.ObjectPath(

1700

"/clients/" + client_object_name)

893

1701

DBusObjectWithProperties.__init__(self, self.bus,

894

1702

self.dbus_object_path)

895

896

def notifychangeproperty(transform_func,

897

dbus_name, type_func=lambda x: x,

898

variant_level=1):

1703

1704

def notifychangeproperty(transform_func, dbus_name,

1705

type_func=lambda x: x,

1706

variant_level=1,

1707

invalidate_only=False,

1708

_interface=_interface):

899

1709

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

900

1710

its changes to DBus.

901

1711

902

1712

transform_fun: Function that takes a value and a variant_level

903

1713

and transforms it to a D-Bus type.

904

1714

dbus_name: D-Bus name of the variable

906

1716

to the D-Bus. Default: no transform

907

1717

variant_level: D-Bus variant level. Default: 1

908

1718

"""

909

attrname = "_{0}".format(dbus_name)

1719

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

1720

910

1721

def setter(self, value):

911

1722

if hasattr(self, "dbus_object_path"):

912

1723

if (not hasattr(self, attrname) or

913

1724

type_func(getattr(self, attrname, None))

914

1725

!= type_func(value)):

915

dbus_value = transform_func(type_func(value),

916

variant_level

917

=variant_level)

918

self.PropertyChanged(dbus.String(dbus_name),

919

dbus_value)

1726

if invalidate_only:

1727

self.PropertiesChanged(

1728

_interface, dbus.Dictionary(),

1729

dbus.Array((dbus_name, )))

1730

else:

1731

dbus_value = transform_func(

1732

type_func(value),

1733

variant_level = variant_level)

1734

self.PropertyChanged(dbus.String(dbus_name),

1735

dbus_value)

1736

self.PropertiesChanged(

1737

_interface,

1738

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

1739

dbus_value }),

1740

dbus.Array())

920

1741

setattr(self, attrname, value)

921

1742

922

1743

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

923

1744

924

925

1745

expires = notifychangeproperty(datetime_to_dbus, "Expires")

926

1746

approvals_pending = notifychangeproperty(dbus.Boolean,

927

1747

"ApprovalPending",

929

1749

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

930

1750

last_enabled = notifychangeproperty(datetime_to_dbus,

931

1751

"LastEnabled")

932

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

933

type_func = lambda checker:

934

checker is not None)

1752

checker = notifychangeproperty(

1753

dbus.Boolean, "CheckerRunning",

1754

type_func = lambda checker: checker is not None)

935

1755

last_checked_ok = notifychangeproperty(datetime_to_dbus,

936

1756

"LastCheckedOK")

1757

last_checker_status = notifychangeproperty(dbus.Int16,

1758

"LastCheckerStatus")

937

1759

last_approval_request = notifychangeproperty(

938

1760

datetime_to_dbus, "LastApprovalRequest")

939

1761

approved_by_default = notifychangeproperty(dbus.Boolean,

940

1762

"ApprovedByDefault")

941

approval_delay = notifychangeproperty(dbus.UInt16,

942

"ApprovalDelay",

943

type_func =

944

_timedelta_to_milliseconds)

1763

approval_delay = notifychangeproperty(

1764

dbus.UInt64, "ApprovalDelay",

1765

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

945

1766

approval_duration = notifychangeproperty(

946

dbus.UInt16, "ApprovalDuration",

947

type_func = _timedelta_to_milliseconds)

1767

dbus.UInt64, "ApprovalDuration",

1768

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

948

1769

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

949

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

950

type_func =

951

_timedelta_to_milliseconds)

1770

timeout = notifychangeproperty(

1771

dbus.UInt64, "Timeout",

1772

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

952

1773

extended_timeout = notifychangeproperty(

953

dbus.UInt16, "ExtendedTimeout",

954

type_func = _timedelta_to_milliseconds)

955

interval = notifychangeproperty(dbus.UInt16,

956

"Interval",

957

type_func =

958

_timedelta_to_milliseconds)

1774

dbus.UInt64, "ExtendedTimeout",

1775

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

1776

interval = notifychangeproperty(

1777

dbus.UInt64, "Interval",

1778

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

959

1779

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

1780

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

1781

invalidate_only=True)

960

1782

961

1783

del notifychangeproperty

962

1784

969

1791

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

970

1792

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

971

1793

972

def checker_callback(self, pid, condition, command,

973

*args, **kwargs):

974

self.checker_callback_tag = None

975

self.checker = None

976

if os.WIFEXITED(condition):

977

exitstatus = os.WEXITSTATUS(condition)

1794

def checker_callback(self, source, condition,

1795

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

1796

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

1797

connection, command, *args,

1798

**kwargs)

1799

exitstatus = self.last_checker_status

1800

if exitstatus >= 0:

978

1801

# Emit D-Bus signal

979

1802

self.CheckerCompleted(dbus.Int16(exitstatus),

980

dbus.Int64(condition),

1803

# This is specific to GNU libC

1804

dbus.Int64(exitstatus << 8),

981

1805

dbus.String(command))

982

1806

else:

983

1807

# Emit D-Bus signal

984

1808

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

985

dbus.Int64(condition),

1809

dbus.Int64(

1810

# This is specific to GNU libC

1811

(exitstatus << 8)

1812

| self.last_checker_signal),

986

1813

dbus.String(command))

987

988

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

989

*args, **kwargs)

1814

return ret

990

1815

991

1816

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

992

old_checker = self.checker

993

if self.checker is not None:

994

old_checker_pid = self.checker.pid

995

else:

996

old_checker_pid = None

1817

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

997

1818

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

998

1819

# Only if new checker process was started

999

1820

if (self.checker is not None

1003

1824

return r

1004

1825

1005

1826

def _reset_approved(self):

1006

self._approved = None

1827

self.approved = None

1007

1828

return False

1008

1829

1009

1830

def approve(self, value=True):

1831

self.approved = value

1832

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

1833

* 1000), self._reset_approved)

1010

1834

self.send_changedstate()

1011

self._approved = value

1012

gobject.timeout_add(_timedelta_to_milliseconds

1013

(self.approval_duration),

1014

self._reset_approved)

1015

1016

1835

1017

1836

## D-Bus methods, signals & properties

1018

_interface = "se.recompile.Mandos.Client"

1837

1838

## Interfaces

1019

1839

1020

1840

## Signals

1021

1841

1032

1852

pass

1033

1853

1034

1854

# PropertyChanged - signal

1855

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

1035

1856

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

1036

1857

def PropertyChanged(self, property, value):

1037

1858

"D-Bus signal"

1071

1892

self.checked_ok()

1072

1893

1073

1894

# Enable - method

1895

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

1074

1896

@dbus.service.method(_interface)

1075

1897

def Enable(self):

1076

1898

"D-Bus method"

1077

1899

self.enable()

1078

1900

1079

1901

# StartChecker - method

1902

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

1080

1903

@dbus.service.method(_interface)

1081

1904

def StartChecker(self):

1082

1905

"D-Bus method"

1083

1906

self.start_checker()

1084

1907

1085

1908

# Disable - method

1909

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

1086

1910

@dbus.service.method(_interface)

1087

1911

def Disable(self):

1088

1912

"D-Bus method"

1089

1913

self.disable()

1090

1914

1091

1915

# StopChecker - method

1916

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

1092

1917

@dbus.service.method(_interface)

1093

1918

def StopChecker(self):

1094

1919

self.stop_checker()

1101

1926

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

1102

1927

1103

1928

# ApprovedByDefault - property

1104

@dbus_service_property(_interface, signature="b",

1929

@dbus_service_property(_interface,

1930

signature="b",

1105

1931

access="readwrite")

1106

1932

def ApprovedByDefault_dbus_property(self, value=None):

1107

1933

if value is None: # get

1109

1935

self.approved_by_default = bool(value)

1110

1936

1111

1937

# ApprovalDelay - property

1112

@dbus_service_property(_interface, signature="t",

1938

@dbus_service_property(_interface,

1939

signature="t",

1113

1940

access="readwrite")

1114

1941

def ApprovalDelay_dbus_property(self, value=None):

1115

1942

if value is None: # get

1116

return dbus.UInt64(self.approval_delay_milliseconds())

1943

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

1944

* 1000)

1117

1945

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

1118

1946

1119

1947

# ApprovalDuration - property

1120

@dbus_service_property(_interface, signature="t",

1948

@dbus_service_property(_interface,

1949

signature="t",

1121

1950

access="readwrite")

1122

1951

def ApprovalDuration_dbus_property(self, value=None):

1123

1952

if value is None: # get

1124

return dbus.UInt64(_timedelta_to_milliseconds(

1125

self.approval_duration))

1953

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

1954

* 1000)

1126

1955

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

1127

1956

1128

1957

# Name - property

1958

@dbus_annotations(

1959

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

1129

1960

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

1130

1961

def Name_dbus_property(self):

1131

1962

return dbus.String(self.name)

1132

1963

1133

1964

# Fingerprint - property

1965

@dbus_annotations(

1966

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

1134

1967

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

1135

1968

def Fingerprint_dbus_property(self):

1136

1969

return dbus.String(self.fingerprint)

1137

1970

1138

1971

# Host - property

1139

@dbus_service_property(_interface, signature="s",

1972

@dbus_service_property(_interface,

1973

signature="s",

1140

1974

access="readwrite")

1141

1975

def Host_dbus_property(self, value=None):

1142

1976

if value is None: # get

1143

1977

return dbus.String(self.host)

1144

self.host = value

1978

self.host = str(value)

1145

1979

1146

1980

# Created - property

1981

@dbus_annotations(

1982

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

1147

1983

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

1148

1984

def Created_dbus_property(self):

1149

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

1985

return datetime_to_dbus(self.created)

1150

1986

1151

1987

# LastEnabled - property

1152

1988

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

1154

1990

return datetime_to_dbus(self.last_enabled)

1155

1991

1156

1992

# Enabled - property

1157

@dbus_service_property(_interface, signature="b",

1993

@dbus_service_property(_interface,

1994

signature="b",

1158

1995

access="readwrite")

1159

1996

def Enabled_dbus_property(self, value=None):

1160

1997

if value is None: # get

1165

2002

self.disable()

1166

2003

1167

2004

# LastCheckedOK - property

1168

@dbus_service_property(_interface, signature="s",

2005

@dbus_service_property(_interface,

2006

signature="s",

1169

2007

access="readwrite")

1170

2008

def LastCheckedOK_dbus_property(self, value=None):

1171

2009

if value is not None:

1173

2011

return

1174

2012

return datetime_to_dbus(self.last_checked_ok)

1175

2013

2014

# LastCheckerStatus - property

2015

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

2016

def LastCheckerStatus_dbus_property(self):

2017

return dbus.Int16(self.last_checker_status)

2018

1176

2019

# Expires - property

1177

2020

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

1178

2021

def Expires_dbus_property(self):

1184

2027

return datetime_to_dbus(self.last_approval_request)

1185

2028

1186

2029

# Timeout - property

1187

@dbus_service_property(_interface, signature="t",

2030

@dbus_service_property(_interface,

2031

signature="t",

1188

2032

access="readwrite")

1189

2033

def Timeout_dbus_property(self, value=None):

1190

2034

if value is None: # get

1191

return dbus.UInt64(self.timeout_milliseconds())

2035

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

2036

old_timeout = self.timeout

1192

2037

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

1193

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

1194

return

1195

# Reschedule timeout

1196

gobject.source_remove(self.disable_initiator_tag)

1197

self.disable_initiator_tag = None

1198

self.expires = None

1199

time_to_die = _timedelta_to_milliseconds((self

1200

.last_checked_ok

1201

+ self.timeout)

1202

- datetime.datetime

1203

.utcnow())

1204

if time_to_die <= 0:

1205

# The timeout has passed

1206

self.disable()

1207

else:

1208

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

1209

+ datetime.timedelta(milliseconds =

1210

time_to_die))

1211

self.disable_initiator_tag = (gobject.timeout_add

1212

(time_to_die, self.disable))

2038

# Reschedule disabling

2039

if self.enabled:

2040

now = datetime.datetime.utcnow()

2041

self.expires += self.timeout - old_timeout

2042

if self.expires <= now:

2043

# The timeout has passed

2044

self.disable()

2045

else:

2046

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

2047

is None):

2048

return

2049

GLib.source_remove(self.disable_initiator_tag)

2050

self.disable_initiator_tag = GLib.timeout_add(

2051

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

2052

self.disable)

1213

2053

1214

2054

# ExtendedTimeout - property

1215

@dbus_service_property(_interface, signature="t",

2055

@dbus_service_property(_interface,

2056

signature="t",

1216

2057

access="readwrite")

1217

2058

def ExtendedTimeout_dbus_property(self, value=None):

1218

2059

if value is None: # get

1219

return dbus.UInt64(self.extended_timeout_milliseconds())

2060

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

2061

* 1000)

1220

2062

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

1221

2063

1222

2064

# Interval - property

1223

@dbus_service_property(_interface, signature="t",

2065

@dbus_service_property(_interface,

2066

signature="t",

1224

2067

access="readwrite")

1225

2068

def Interval_dbus_property(self, value=None):

1226

2069

if value is None: # get

1227

return dbus.UInt64(self.interval_milliseconds())

2070

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

1228

2071

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

1229

2072

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

1230

2073

return

1231

# Reschedule checker run

1232

gobject.source_remove(self.checker_initiator_tag)

1233

self.checker_initiator_tag = (gobject.timeout_add

1234

(value, self.start_checker))

1235

self.start_checker() # Start one now, too

2074

if self.enabled:

2075

# Reschedule checker run

2076

GLib.source_remove(self.checker_initiator_tag)

2077

self.checker_initiator_tag = GLib.timeout_add(

2078

value, self.start_checker)

2079

self.start_checker() # Start one now, too

1236

2080

1237

2081

# Checker - property

1238

@dbus_service_property(_interface, signature="s",

2082

@dbus_service_property(_interface,

2083

signature="s",

1239

2084

access="readwrite")

1240

2085

def Checker_dbus_property(self, value=None):

1241

2086

if value is None: # get

1242

2087

return dbus.String(self.checker_command)

1243

self.checker_command = value

2088

self.checker_command = str(value)

1244

2089

1245

2090

# CheckerRunning - property

1246

@dbus_service_property(_interface, signature="b",

2091

@dbus_service_property(_interface,

2092

signature="b",

1247

2093

access="readwrite")

1248

2094

def CheckerRunning_dbus_property(self, value=None):

1249

2095

if value is None: # get

1254

2100

self.stop_checker()

1255

2101

1256

2102

# ObjectPath - property

2103

@dbus_annotations(

2104

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

2105

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

1257

2106

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

1258

2107

def ObjectPath_dbus_property(self):

1259

2108

return self.dbus_object_path # is already a dbus.ObjectPath

1260

2109

1261

2110

# Secret = property

1262

@dbus_service_property(_interface, signature="ay",

1263

access="write", byte_arrays=True)

2111

@dbus_annotations(

2112

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

2113

"invalidates"})

2114

@dbus_service_property(_interface,

2115

signature="ay",

2116

access="write",

2117

byte_arrays=True)

1264

2118

def Secret_dbus_property(self, value):

1265

self.secret = str(value)

2119

self.secret = bytes(value)

1266

2120

1267

2121

del _interface

1268

2122

1272

2126

self._pipe = child_pipe

1273

2127

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

1274

2128

if not self._pipe.recv():

1275

raise KeyError()

2129

raise KeyError(fpr)

1276

2130

1277

2131

def __getattribute__(self, name):

1278

if(name == '_pipe'):

2132

if name == '_pipe':

1279

2133

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

1280

2134

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

1281

2135

data = self._pipe.recv()

1282

2136

if data[0] == 'data':

1283

2137

return data[1]

1284

2138

if data[0] == 'function':

2139

1285

2140

def func(*args, **kwargs):

1286

2141

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

1287

2142

return self._pipe.recv()[1]

2143

1288

2144

return func

1289

2145

1290

2146

def __setattr__(self, name, value):

1291

if(name == '_pipe'):

2147

if name == '_pipe':

1292

2148

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

1293

2149

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

1294

2150

1295

class ClientDBusTransitional(ClientDBus):

1296

__metaclass__ = AlternateDBusNamesMetaclass

1297

2151

1298

2152

class ClientHandler(socketserver.BaseRequestHandler, object):

1299

2153

"""A class to handle client connections.

1304

2158

def handle(self):

1305

2159

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

1306

2160

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

1307

unicode(self.client_address))

2161

str(self.client_address))

1308

2162

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

1309

2163

self.server.child_pipe.fileno())

1310

2164

1311

session = (gnutls.connection

1312

.ClientSession(self.request,

1313

gnutls.connection

1314

.X509Credentials()))

1315

1316

# Note: gnutls.connection.X509Credentials is really a

1317

# generic GnuTLS certificate credentials object so long as

1318

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

1319

# here despite using OpenPGP certificates.

2165

session = gnutls.ClientSession(self.request)

1320

2166

1321

2167

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

1322

2168

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

1326

2172

priority = self.server.gnutls_priority

1327

2173

if priority is None:

1328

2174

priority = "NORMAL"

1329

(gnutls.library.functions

1330

.gnutls_priority_set_direct(session._c_object,

1331

priority, None))

2175

gnutls.priority_set_direct(session._c_object, priority,

2176

None)

1332

2177

1333

2178

# Start communication using the Mandos protocol

1334

2179

# Get protocol number

1336

2181

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

1337

2182

try:

1338

2183

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

1339

raise RuntimeError

2184

raise RuntimeError(line)

1340

2185

except (ValueError, IndexError, RuntimeError) as error:

1341

2186

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

1342

2187

return

1344

2189

# Start GnuTLS connection

1345

2190

try:

1346

2191

session.handshake()

1347

except gnutls.errors.GNUTLSError as error:

2192

except gnutls.Error as error:

1348

2193

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

1349

2194

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

1350

2195

# established. Just abandon the request.

1354

2199

approval_required = False

1355

2200

try:

1356

2201

try:

1357

fpr = self.fingerprint(self.peer_certificate

1358

(session))

1359

except (TypeError,

1360

gnutls.errors.GNUTLSError) as error:

2202

fpr = self.fingerprint(

2203

self.peer_certificate(session))

2204

except (TypeError, gnutls.Error) as error:

1361

2205

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

1362

2206

return

1363

2207

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

1376

2220

while True:

1377

2221

if not client.enabled:

1378

2222

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

1379

client.name)

2223

client.name)

1380

2224

if self.server.use_dbus:

1381

2225

# Emit D-Bus signal

1382

2226

client.Rejected("Disabled")

1383

2227

return

1384

2228

1385

if client._approved or not client.approval_delay:

2229

if client.approved or not client.approval_delay:

1386

2230

#We are approved or approval is disabled

1387

2231

break

1388

elif client._approved is None:

2232

elif client.approved is None:

1389

2233

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

1390

2234

client.name)

1391

2235

if self.server.use_dbus:

1392

2236

# Emit D-Bus signal

1393

2237

client.NeedApproval(

1394

client.approval_delay_milliseconds(),

1395

client.approved_by_default)

2238

client.approval_delay.total_seconds()

2239

* 1000, client.approved_by_default)

1396

2240

else:

1397

2241

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

1398

2242

client.name)

1404

2248

#wait until timeout or approved

1405

2249

time = datetime.datetime.now()

1406

2250

client.changedstate.acquire()

1407

(client.changedstate.wait

1408

(float(client._timedelta_to_milliseconds(delay)

1409

/ 1000)))

2251

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

1410

2252

client.changedstate.release()

1411

2253

time2 = datetime.datetime.now()

1412

2254

if (time2 - time) >= delay:

1423

2265

else:

1424

2266

delay -= time2 - time

1425

2267

1426

sent_size = 0

1427

while sent_size < len(client.secret):

1428

try:

1429

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

1430

except gnutls.errors.GNUTLSError as error:

1431

logger.warning("gnutls send failed")

1432

return

1433

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

1434

sent, len(client.secret)

1435

- (sent_size + sent))

1436

sent_size += sent

2268

try:

2269

session.send(client.secret)

2270

except gnutls.Error as error:

2271

logger.warning("gnutls send failed",

2272

exc_info = error)

2273

return

1437

2274

1438

2275

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

1439

2276

# bump the timeout using extended_timeout

1440

client.checked_ok(client.extended_timeout)

2277

client.bump_timeout(client.extended_timeout)

1441

2278

if self.server.use_dbus:

1442

2279

# Emit D-Bus signal

1443

2280

client.GotSecret()

1447

2284

client.approvals_pending -= 1

1448

2285

try:

1449

2286

session.bye()

1450

except gnutls.errors.GNUTLSError as error:

1451

logger.warning("GnuTLS bye failed")

2287

except gnutls.Error as error:

2288

logger.warning("GnuTLS bye failed",

2289

exc_info=error)

1452

2290

1453

2291

@staticmethod

1454

2292

def peer_certificate(session):

1455

2293

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

1456

2294

# If not an OpenPGP certificate...

1457

if (gnutls.library.functions

1458

.gnutls_certificate_type_get(session._c_object)

1459

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

1460

# ...do the normal thing

1461

return session.peer_certificate

2295

if (gnutls.certificate_type_get(session._c_object)

2296

!= gnutls.CRT_OPENPGP):

2297

# ...return invalid data

2298

return b""

1462

2299

list_size = ctypes.c_uint(1)

1463

cert_list = (gnutls.library.functions

1464

.gnutls_certificate_get_peers

2300

cert_list = (gnutls.certificate_get_peers

1465

2301

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

1466

2302

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

1467

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

1468

" certificate")

2303

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

1469

2304

if list_size.value == 0:

1470

2305

return None

1471

2306

cert = cert_list[0]

1475

2310

def fingerprint(openpgp):

1476

2311

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

1477

2312

# New GnuTLS "datum" with the OpenPGP public key

1478

datum = (gnutls.library.types

1479

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

1480

ctypes.POINTER

1481

(ctypes.c_ubyte)),

1482

ctypes.c_uint(len(openpgp))))

2313

datum = gnutls.datum_t(

2314

ctypes.cast(ctypes.c_char_p(openpgp),

2315

ctypes.POINTER(ctypes.c_ubyte)),

2316

ctypes.c_uint(len(openpgp)))

1483

2317

# New empty GnuTLS certificate

1484

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1485

(gnutls.library.functions

1486

.gnutls_openpgp_crt_init(ctypes.byref(crt)))

2318

crt = gnutls.openpgp_crt_t()

2319

gnutls.openpgp_crt_init(ctypes.byref(crt))

1487

2320

# Import the OpenPGP public key into the certificate

1488

(gnutls.library.functions

1489

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

1490

gnutls.library.constants

1491

.GNUTLS_OPENPGP_FMT_RAW))

2321

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

2322

gnutls.OPENPGP_FMT_RAW)

1492

2323

# Verify the self signature in the key

1493

2324

crtverify = ctypes.c_uint()

1494

(gnutls.library.functions

1495

.gnutls_openpgp_crt_verify_self(crt, 0,

1496

ctypes.byref(crtverify)))

2325

gnutls.openpgp_crt_verify_self(crt, 0,

2326

ctypes.byref(crtverify))

1497

2327

if crtverify.value != 0:

1498

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1499

raise (gnutls.errors.CertificateSecurityError

1500

("Verify failed"))

2328

gnutls.openpgp_crt_deinit(crt)

2329

raise gnutls.CertificateSecurityError("Verify failed")

1501

2330

# New buffer for the fingerprint

1502

2331

buf = ctypes.create_string_buffer(20)

1503

2332

buf_len = ctypes.c_size_t()

1504

2333

# Get the fingerprint from the certificate into the buffer

1505

(gnutls.library.functions

1506

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

1507

ctypes.byref(buf_len)))

2334

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

2335

ctypes.byref(buf_len))

1508

2336

# Deinit the certificate

1509

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2337

gnutls.openpgp_crt_deinit(crt)

1510

2338

# Convert the buffer to a Python bytestring

1511

2339

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

1512

2340

# Convert the bytestring to hexadecimal notation

1513

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

2341

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

1514

2342

return hex_fpr

1515

2343

1516

2344

1517

2345

class MultiprocessingMixIn(object):

1518

2346

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

2347

1519

2348

def sub_process_main(self, request, address):

1520

2349

try:

1521

2350

self.finish_request(request, address)

1522

except:

2351

except Exception:

1523

2352

self.handle_error(request, address)

1524

2353

self.close_request(request)

1525

2354

1526

2355

def process_request(self, request, address):

1527

2356

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

1528

2357

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

1529

args = (request,

1530

address))

2358

args = (request, address))

1531

2359

proc.start()

1532

2360

return proc

1533

2361

1534

2362

1535

2363

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1536

2364

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

2365

1537

2366

def process_request(self, request, client_address):

1538

2367

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

1539

2368

1548

2377

1549

2378

def add_pipe(self, parent_pipe, proc):

1550

2379

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

1551

raise NotImplementedError

2380

raise NotImplementedError()

1552

2381

1553

2382

1554

2383

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1560

2389

interface: None or a network interface name (string)

1561

2390

use_ipv6: Boolean; to use IPv6 or not

1562

2391

"""

2392

1563

2393

def __init__(self, server_address, RequestHandlerClass,

1564

interface=None, use_ipv6=True):

2394

interface=None,

2395

use_ipv6=True,

2396

socketfd=None):

2397

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

2398

creating a new one with socket.socket().

2399

"""

1565

2400

self.interface = interface

1566

2401

if use_ipv6:

1567

2402

self.address_family = socket.AF_INET6

2403

if socketfd is not None:

2404

# Save the file descriptor

2405

self.socketfd = socketfd

2406

# Save the original socket.socket() function

2407

self.socket_socket = socket.socket

2408

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

2409

#

2410

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

2411

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

2412

# patching socket.socket.)

2413

#

2414

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

2415

@functools.wraps(socket.socket)

2416

def socket_wrapper(*args, **kwargs):

2417

# Restore original function so subsequent calls are

2418

# not affected.

2419

socket.socket = self.socket_socket

2420

del self.socket_socket

2421

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

2422

# saved file descriptor.

2423

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

2424

# Replace socket.socket() function with wrapper

2425

socket.socket = socket_wrapper

2426

# The socketserver.TCPServer.__init__ will call

2427

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

2428

# socket_wrapper(), if socketfd was set.

1568

2429

socketserver.TCPServer.__init__(self, server_address,

1569

2430

RequestHandlerClass)

2431

1570

2432

def server_bind(self):

1571

2433

"""This overrides the normal server_bind() function

1572

2434

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

1578

2440

self.interface)

1579

2441

else:

1580

2442

try:

1581

self.socket.setsockopt(socket.SOL_SOCKET,

1582

SO_BINDTODEVICE,

1583

str(self.interface

1584

+ '\0'))

2443

self.socket.setsockopt(

2444

socket.SOL_SOCKET, SO_BINDTODEVICE,

2445

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

1585

2446

except socket.error as error:

1586

if error[0] == errno.EPERM:

1587

logger.error("No permission to"

1588

" bind to interface %s",

1589

self.interface)

1590

elif error[0] == errno.ENOPROTOOPT:

2447

if error.errno == errno.EPERM:

2448

logger.error("No permission to bind to"

2449

" interface %s", self.interface)

2450

elif error.errno == errno.ENOPROTOOPT:

1591

2451

logger.error("SO_BINDTODEVICE not available;"

1592

2452

" cannot bind to interface %s",

1593

2453

self.interface)

2454

elif error.errno == errno.ENODEV:

2455

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

2456

" cannot bind", self.interface)

1594

2457

else:

1595

2458

raise

1596

2459

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

1599

2462

if self.address_family == socket.AF_INET6:

1600

2463

any_address = "::" # in6addr_any

1601

2464

else:

1602

any_address = socket.INADDR_ANY

2465

any_address = "0.0.0.0" # INADDR_ANY

1603

2466

self.server_address = (any_address,

1604

2467

self.server_address[1])

1605

2468

elif not self.server_address[1]:

1606

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

1607

0)

2469

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

1608

2470

# if self.interface:

1609

2471

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

1610

2472

# 0, # port

1622

2484

gnutls_priority GnuTLS priority string

1623

2485

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

1624

2486

1625

Assumes a gobject.MainLoop event loop.

2487

Assumes a GLib.MainLoop event loop.

1626

2488

"""

2489

1627

2490

def __init__(self, server_address, RequestHandlerClass,

1628

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

1629

gnutls_priority=None, use_dbus=True):

2491

interface=None,

2492

use_ipv6=True,

2493

clients=None,

2494

gnutls_priority=None,

2495

use_dbus=True,

2496

socketfd=None):

1630

2497

self.enabled = False

1631

2498

self.clients = clients

1632

2499

if self.clients is None:

1633

self.clients = set()

2500

self.clients = {}

1634

2501

self.use_dbus = use_dbus

1635

2502

self.gnutls_priority = gnutls_priority

1636

2503

IPv6_TCPServer.__init__(self, server_address,

1637

2504

RequestHandlerClass,

1638

2505

interface = interface,

1639

use_ipv6 = use_ipv6)

2506

use_ipv6 = use_ipv6,

2507

socketfd = socketfd)

2508

1640

2509

def server_activate(self):

1641

2510

if self.enabled:

1642

2511

return socketserver.TCPServer.server_activate(self)

1646

2515

1647

2516

def add_pipe(self, parent_pipe, proc):

1648

2517

# Call "handle_ipc" for both data and EOF events

1649

gobject.io_add_watch(parent_pipe.fileno(),

1650

gobject.IO_IN | gobject.IO_HUP,

1651

functools.partial(self.handle_ipc,

1652

parent_pipe =

1653

parent_pipe,

1654

proc = proc))

2518

GLib.io_add_watch(

2519

parent_pipe.fileno(),

2520

GLib.IO_IN | GLib.IO_HUP,

2521

functools.partial(self.handle_ipc,

2522

parent_pipe = parent_pipe,

2523

proc = proc))

1655

2524

1656

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

1657

proc = None, client_object=None):

1658

condition_names = {

1659

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

1660

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

1661

# blocking).

1662

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

1663

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

1664

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

1665

# broken, usually for pipes and

1666

# sockets).

1667

}

1668

conditions_string = ' | '.join(name

1669

for cond, name in

1670

condition_names.iteritems()

1671

if cond & condition)

2525

def handle_ipc(self, source, condition,

2526

parent_pipe=None,

2527

proc = None,

2528

client_object=None):

1672

2529

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

1673

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

2530

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

1674

2531

# Wait for other process to exit

1675

2532

proc.join()

1676

2533

return False

1683

2540

fpr = request[1]

1684

2541

address = request[2]

1685

2542

1686

for c in self.clients:

2543

for c in self.clients.values():

1687

2544

if c.fingerprint == fpr:

1688

2545

client = c

1689

2546

break

1697

2554

parent_pipe.send(False)

1698

2555

return False

1699

2556

1700

gobject.io_add_watch(parent_pipe.fileno(),

1701

gobject.IO_IN | gobject.IO_HUP,

1702

functools.partial(self.handle_ipc,

1703

parent_pipe =

1704

parent_pipe,

1705

proc = proc,

1706

client_object =

1707

client))

2557

GLib.io_add_watch(

2558

parent_pipe.fileno(),

2559

GLib.IO_IN | GLib.IO_HUP,

2560

functools.partial(self.handle_ipc,

2561

parent_pipe = parent_pipe,

2562

proc = proc,

2563

client_object = client))

1708

2564

parent_pipe.send(True)

1709

2565

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

1710

2566

# same fileno

1716

2572

1717

2573

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

1718

2574

funcname)(*args,

1719

**kwargs)))

2575

**kwargs)))

1720

2576

1721

2577

if command == 'getattr':

1722

2578

attrname = request[1]

1723

if callable(client_object.__getattribute__(attrname)):

1724

parent_pipe.send(('function',))

2579

if isinstance(client_object.__getattribute__(attrname),

2580

collections.Callable):

2581

parent_pipe.send(('function', ))

1725

2582

else:

1726

parent_pipe.send(('data', client_object

1727

.__getattribute__(attrname)))

2583

parent_pipe.send((

2584

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

1728

2585

1729

2586

if command == 'setattr':

1730

2587

attrname = request[1]

1734

2591

return True

1735

2592

1736

2593

2594

def rfc3339_duration_to_delta(duration):

2595

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

2596

2597

>>> rfc3339_duration_to_delta("P7D")

2598

datetime.timedelta(7)

2599

>>> rfc3339_duration_to_delta("PT60S")

2600

datetime.timedelta(0, 60)

2601

>>> rfc3339_duration_to_delta("PT60M")

2602

datetime.timedelta(0, 3600)

2603

>>> rfc3339_duration_to_delta("PT24H")

2604

datetime.timedelta(1)

2605

>>> rfc3339_duration_to_delta("P1W")

2606

datetime.timedelta(7)

2607

>>> rfc3339_duration_to_delta("PT5M30S")

2608

datetime.timedelta(0, 330)

2609

>>> rfc3339_duration_to_delta("P1DT3M20S")

2610

datetime.timedelta(1, 200)

2611

"""

2612

2613

# Parsing an RFC 3339 duration with regular expressions is not

2614

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

2615

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

2616

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

2617

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

2618

# avoid excessive use of external libraries.

2619

2620

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

2621

Token = collections.namedtuple("Token", (

2622

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

2623

# a "group" containing digits

2624

"value", # datetime.timedelta or None

2625

"followers")) # Tokens valid after this token

2626

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

2627

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

2628

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

2629

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

2630

datetime.timedelta(seconds=1),

2631

frozenset((token_end, )))

2632

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

2633

datetime.timedelta(minutes=1),

2634

frozenset((token_second, token_end)))

2635

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

2636

datetime.timedelta(hours=1),

2637

frozenset((token_minute, token_end)))

2638

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

2639

None,

2640

frozenset((token_hour, token_minute,

2641

token_second)))

2642

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

2643

datetime.timedelta(days=1),

2644

frozenset((token_time, token_end)))

2645

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

2646

datetime.timedelta(weeks=4),

2647

frozenset((token_day, token_end)))

2648

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

2649

datetime.timedelta(weeks=52),

2650

frozenset((token_month, token_end)))

2651

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

2652

datetime.timedelta(weeks=1),

2653

frozenset((token_end, )))

2654

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

2655

frozenset((token_year, token_month,

2656

token_day, token_time,

2657

token_week)))

2658

# Define starting values

2659

value = datetime.timedelta() # Value so far

2660

found_token = None

2661

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

2662

s = duration # String left to parse

2663

# Loop until end token is found

2664

while found_token is not token_end:

2665

# Search for any currently valid tokens

2666

for token in followers:

2667

match = token.regexp.match(s)

2668

if match is not None:

2669

# Token found

2670

if token.value is not None:

2671

# Value found, parse digits

2672

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

2673

# Add to value so far

2674

value += factor * token.value

2675

# Strip token from string

2676

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

2677

# Go to found token

2678

found_token = token

2679

# Set valid next tokens

2680

followers = found_token.followers

2681

break

2682

else:

2683

# No currently valid tokens were found

2684

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

2685

.format(duration))

2686

# End token found

2687

return value

2688

2689

1737

2690

def string_to_delta(interval):

1738

2691

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

1739

2692

1750

2703

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

1751

2704

datetime.timedelta(0, 330)

1752

2705

"""

2706

2707

try:

2708

return rfc3339_duration_to_delta(interval)

2709

except ValueError:

2710

pass

2711

1753

2712

timevalue = datetime.timedelta(0)

1754

2713

for s in interval.split():

1755

2714

try:

1756

suffix = unicode(s[-1])

2715

suffix = s[-1]

1757

2716

value = int(s[:-1])

1758

2717

if suffix == "d":

1759

2718

delta = datetime.timedelta(value)

1766

2725

elif suffix == "w":

1767

2726

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

1768

2727

else:

1769

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

1770

except (ValueError, IndexError) as e:

2728

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

2729

except IndexError as e:

1771

2730

raise ValueError(*(e.args))

1772

2731

timevalue += delta

1773

2732

return timevalue

1774

2733

1775

2734

1776

def if_nametoindex(interface):

1777

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

1778

1779

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

1780

global if_nametoindex

1781

try:

1782

if_nametoindex = (ctypes.cdll.LoadLibrary

1783

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

1784

.if_nametoindex)

1785

except (OSError, AttributeError):

1786

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

1787

def if_nametoindex(interface):

1788

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

1789

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

1790

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

1791

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1792

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

1793

interface))

1794

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

1795

ifreq[16:20])[0]

1796

return interface_index

1797

return if_nametoindex(interface)

1798

1799

1800

2735

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

1801

2736

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

1802

2737

1810

2745

sys.exit()

1811

2746

if not noclose:

1812

2747

# Close all standard open file descriptors

1813

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

2748

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

1814

2749

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

1815

2750

raise OSError(errno.ENODEV,

1816

"%s not a character device"

1817

% os.path.devnull)

2751

"{} not a character device"

2752

.format(os.devnull))

1818

2753

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

1819

2754

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

1820

2755

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

1829

2764

1830

2765

parser = argparse.ArgumentParser()

1831

2766

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

1832

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

2767

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

1833

2768

help="show version number and exit")

1834

2769

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

1835

2770

help="Bind to interface IF")

1841

2776

help="Run self-test")

1842

2777

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

1843

2778

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

1844

" to terminal")

2779

" to terminal", default=None)

1845

2780

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

1846

2781

help="Debug level for stdout output")

1847

2782

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

1854

2789

" files")

1855

2790

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

1856

2791

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

1857

" system bus interface")

2792

" system bus interface", default=None)

1858

2793

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

1859

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

2794

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

2795

default=None)

2796

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

2797

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

2798

" state", default=None)

2799

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

2800

help="Specify a file descriptor to a network"

2801

" socket to use instead of creating one")

2802

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

2803

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

2804

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

2805

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

2806

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

2807

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

2808

default=None)

2809

1860

2810

options = parser.parse_args()

1861

2811

1862

2812

if options.check:

1863

2813

import doctest

1864

doctest.testmod()

1865

sys.exit()

2814

fail_count, test_count = doctest.testmod()

2815

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

1866

2816

1867

2817

# Default values for config file for server-global settings

1868

2818

server_defaults = { "interface": "",

1870

2820

"port": "",

1871

2821

"debug": "False",

1872

2822

"priority":

1873

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

2823

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

2824

":+SIGN-DSA-SHA256",

1874

2825

"servicename": "Mandos",

1875

2826

"use_dbus": "True",

1876

2827

"use_ipv6": "True",

1877

2828

"debuglevel": "",

1878

}

2829

"restore": "True",

2830

"socket": "",

2831

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

2832

"foreground": "False",

2833

"zeroconf": "True",

2834

}

1879

2835

1880

2836

# Parse config file for server-global settings

1881

2837

server_config = configparser.SafeConfigParser(server_defaults)

1882

2838

del server_defaults

1883

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

1884

"mandos.conf"))

2839

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

1885

2840

# Convert the SafeConfigParser object to a dict

1886

2841

server_settings = server_config.defaults()

1887

2842

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

1888

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

2843

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

1889

2844

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

1890

2845

option)

1891

2846

if server_settings["port"]:

1892

2847

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

1893

2848

"port")

2849

if server_settings["socket"]:

2850

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

2851

"socket")

2852

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

2853

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

2854

# happen with a supplied network socket.

2855

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

2856

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

2857

["socket"])

1894

2858

del server_config

1895

2859

1896

2860

# Override the settings from the config file with command line

1897

2861

# options, if set.

1898

2862

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

1899

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

1900

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

2863

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

2864

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

2865

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

1901

2866

value = getattr(options, option)

1902

2867

if value is not None:

1903

2868

server_settings[option] = value

1904

2869

del options

1905

2870

# Force all strings to be unicode

1906

2871

for option in server_settings.keys():

1907

if type(server_settings[option]) is str:

1908

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

2872

if isinstance(server_settings[option], bytes):

2873

server_settings[option] = (server_settings[option]

2874

.decode("utf-8"))

2875

# Force all boolean options to be boolean

2876

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

2877

"foreground", "zeroconf"):

2878

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

2879

# Debug implies foreground

2880

if server_settings["debug"]:

2881

server_settings["foreground"] = True

1909

2882

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

1910

2883

1911

2884

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

1912

2885

2886

if (not server_settings["zeroconf"]

2887

and not (server_settings["port"]

2888

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

2889

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

2890

1913

2891

# For convenience

1914

2892

debug = server_settings["debug"]

1915

2893

debuglevel = server_settings["debuglevel"]

1916

2894

use_dbus = server_settings["use_dbus"]

1917

2895

use_ipv6 = server_settings["use_ipv6"]

2896

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

2897

stored_state_file)

2898

foreground = server_settings["foreground"]

2899

zeroconf = server_settings["zeroconf"]

2900

2901

if debug:

2902

initlogger(debug, logging.DEBUG)

2903

else:

2904

if not debuglevel:

2905

initlogger(debug)

2906

else:

2907

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

2908

initlogger(debug, level)

1918

2909

1919

2910

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

1920

syslogger.setFormatter(logging.Formatter

1921

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

1922

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

1923

% server_settings["servicename"]))

2911

syslogger.setFormatter(

2912

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

2913

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

2914

server_settings["servicename"])))

1924

2915

1925

2916

# Parse config file with clients

1926

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

1927

"extended_timeout": "15m",

1928

"interval": "2m",

1929

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

1930

"host": "",

1931

"approval_delay": "0s",

1932

"approval_duration": "1s",

1933

}

1934

client_config = configparser.SafeConfigParser(client_defaults)

2917

client_config = configparser.SafeConfigParser(Client

2918

.client_defaults)

1935

2919

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

1936

2920

"clients.conf"))

1937

2921

1938

2922

global mandos_dbus_service

1939

2923

mandos_dbus_service = None

1940

2924

1941

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

1942

server_settings["port"]),

1943

ClientHandler,

1944

interface=(server_settings["interface"]

1945

or None),

1946

use_ipv6=use_ipv6,

1947

gnutls_priority=

1948

server_settings["priority"],

1949

use_dbus=use_dbus)

1950

if not debug:

1951

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

2925

socketfd = None

2926

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

2927

socketfd = server_settings["socket"]

2928

tcp_server = MandosServer(

2929

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

2930

ClientHandler,

2931

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

2932

use_ipv6=use_ipv6,

2933

gnutls_priority=server_settings["priority"],

2934

use_dbus=use_dbus,

2935

socketfd=socketfd)

2936

if not foreground:

2937

pidfilename = "/run/mandos.pid"

2938

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

2939

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

2940

pidfile = None

1952

2941

try:

1953

pidfile = open(pidfilename, "w")

1954

except IOError:

1955

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

2942

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

2943

except IOError as e:

2944

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

2945

exc_info=e)

1956

2946

1957

try:

1958

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

1959

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

1960

except KeyError:

2947

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

2948

("mandos", "mandos"),

2949

("nobody", "nogroup")):

1961

2950

try:

1962

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

1963

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

2951

uid = pwd.getpwnam(name).pw_uid

2952

gid = pwd.getpwnam(group).pw_gid

2953

break

1964

2954

except KeyError:

1965

try:

1966

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

1967

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

1968

except KeyError:

1969

uid = 65534

1970

gid = 65534

2955

continue

2956

else:

2957

uid = 65534

2958

gid = 65534

1971

2959

try:

1972

2960

os.setgid(gid)

1973

2961

os.setuid(uid)

2962

if debug:

2963

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

2964

gid))

1974

2965

except OSError as error:

1975

if error[0] != errno.EPERM:

1976

raise error

1977

1978

if not debug and not debuglevel:

1979

logger.setLevel(logging.WARNING)

1980

if debuglevel:

1981

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

1982

logger.setLevel(level)

2966

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

2967

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

2968

if error.errno != errno.EPERM:

2969

raise

1983

2970

1984

2971

if debug:

1985

logger.setLevel(logging.DEBUG)

1986

2972

# Enable all possible GnuTLS debugging

1987

2973

1988

2974

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

1989

2975

# - GnuTLS manual

1990

gnutls.library.functions.gnutls_global_set_log_level(11)

2976

gnutls.global_set_log_level(11)

1991

2977

1992

@gnutls.library.types.gnutls_log_func

2978

@gnutls.log_func

1993

2979

def debug_gnutls(level, string):

1994

2980

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

1995

2981

1996

(gnutls.library.functions

1997

.gnutls_global_set_log_function(debug_gnutls))

2982

gnutls.global_set_log_function(debug_gnutls)

1998

2983

1999

2984

# Redirect stdin so all checkers get /dev/null

2000

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

2985

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

2001

2986

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

2002

2987

if null > 2:

2003

2988

os.close(null)

2004

else:

2005

# No console logging

2006

logger.removeHandler(console)

2007

2989

2008

2990

# Need to fork before connecting to D-Bus

2009

if not debug:

2991

if not foreground:

2010

2992

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

2011

2993

daemon()

2012

2994

2995

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

2996

# to inform GLib that threads will be used.

2997

GLib.threads_init()

2998

2013

2999

global main_loop

2014

3000

# From the Avahi example code

2015

DBusGMainLoop(set_as_default=True )

2016

main_loop = gobject.MainLoop()

3001

DBusGMainLoop(set_as_default=True)

3002

main_loop = GLib.MainLoop()

2017

3003

bus = dbus.SystemBus()

2018

3004

# End of Avahi example code

2019

3005

if use_dbus:

2020

3006

try:

2021

3007

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

2022

bus, do_not_queue=True)

2023

old_bus_name = (dbus.service.BusName

2024

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

2025

do_not_queue=True))

2026

except dbus.exceptions.NameExistsException as e:

2027

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

3008

bus,

3009

do_not_queue=True)

3010

old_bus_name = dbus.service.BusName(

3011

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

3012

do_not_queue=True)

3013

except dbus.exceptions.DBusException as e:

3014

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

2028

3015

use_dbus = False

2029

3016

server_settings["use_dbus"] = False

2030

3017

tcp_server.use_dbus = False

2031

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2032

service = AvahiServiceToSyslog(name =

2033

server_settings["servicename"],

2034

servicetype = "_mandos._tcp",

2035

protocol = protocol, bus = bus)

2036

if server_settings["interface"]:

2037

service.interface = (if_nametoindex

2038

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

3018

if zeroconf:

3019

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

3020

service = AvahiServiceToSyslog(

3021

name = server_settings["servicename"],

3022

servicetype = "_mandos._tcp",

3023

protocol = protocol,

3024

bus = bus)

3025

if server_settings["interface"]:

3026

service.interface = if_nametoindex(

3027

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

2039

3028

2040

3029

global multiprocessing_manager

2041

3030

multiprocessing_manager = multiprocessing.Manager()

2042

3031

2043

3032

client_class = Client

2044

3033

if use_dbus:

2045

client_class = functools.partial(ClientDBusTransitional,

2046

bus = bus)

2047

def client_config_items(config, section):

2048

special_settings = {

2049

"approved_by_default":

2050

lambda: config.getboolean(section,

2051

"approved_by_default"),

2052

}

2053

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

3034

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

3035

3036

client_settings = Client.config_parser(client_config)

3037

old_client_settings = {}

3038

clients_data = {}

3039

3040

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

3041

global wnull

3042

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

3043

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

3044

# mode

3045

if debug or not foreground:

3046

wnull.close()

3047

3048

# Get client data and settings from last running state.

3049

if server_settings["restore"]:

3050

try:

3051

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

3052

if sys.version_info.major == 2:

3053

clients_data, old_client_settings = pickle.load(

3054

stored_state)

3055

else:

3056

bytes_clients_data, bytes_old_client_settings = (

3057

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

3058

### Fix bytes to strings

3059

## clients_data

3060

# .keys()

3061

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

3062

if isinstance(key, bytes)

3063

else key): value

3064

for key, value in

3065

bytes_clients_data.items() }

3066

del bytes_clients_data

3067

for key in clients_data:

3068

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

3069

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

3070

for k, v in

3071

clients_data[key].items() }

3072

clients_data[key] = value

3073

# .client_structure

3074

value["client_structure"] = [

3075

(s.decode("utf-8")

3076

if isinstance(s, bytes)

3077

else s) for s in

3078

value["client_structure"] ]

3079

# .name & .host

3080

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

3081

if isinstance(value[k], bytes):

3082

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

3083

## old_client_settings

3084

# .keys()

3085

old_client_settings = {

3086

(key.decode("utf-8")

3087

if isinstance(key, bytes)

3088

else key): value

3089

for key, value in

3090

bytes_old_client_settings.items() }

3091

del bytes_old_client_settings

3092

# .host

3093

for value in old_client_settings.values():

3094

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

3095

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

3096

.decode("utf-8"))

3097

os.remove(stored_state_path)

3098

except IOError as e:

3099

if e.errno == errno.ENOENT:

3100

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

3101

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

3102

else:

3103

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

3104

exc_info=e)

3105

raise

3106

except EOFError as e:

3107

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

3108

"EOFError:",

3109

exc_info=e)

3110

3111

with PGPEngine() as pgp:

3112

for client_name, client in clients_data.items():

3113

# Skip removed clients

3114

if client_name not in client_settings:

3115

continue

3116

3117

# Decide which value to use after restoring saved state.

3118

# We have three different values: Old config file,

3119

# new config file, and saved state.

3120

# New config value takes precedence if it differs from old

3121

# config value, otherwise use saved state.

3122

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

3123

try:

3124

# For each value in new config, check if it

3125

# differs from the old config value (Except for

3126

# the "secret" attribute)

3127

if (name != "secret"

3128

and (value !=

3129

old_client_settings[client_name][name])):

3130

client[name] = value

3131

except KeyError:

3132

pass

3133

3134

# Clients who has passed its expire date can still be

3135

# enabled if its last checker was successful. A Client

3136

# whose checker succeeded before we stored its state is

3137

# assumed to have successfully run all checkers during

3138

# downtime.

3139

if client["enabled"]:

3140

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

3141

if not client["last_checked_ok"]:

3142

logger.warning(

3143

"disabling client {} - Client never "

3144

"performed a successful checker".format(

3145

client_name))

3146

client["enabled"] = False

3147

elif client["last_checker_status"] != 0:

3148

logger.warning(

3149

"disabling client {} - Client last"

3150

" checker failed with error code"

3151

" {}".format(

3152

client_name,

3153

client["last_checker_status"]))

3154

client["enabled"] = False

3155

else:

3156

client["expires"] = (

3157

datetime.datetime.utcnow()

3158

+ client["timeout"])

3159

logger.debug("Last checker succeeded,"

3160

" keeping {} enabled".format(

3161

client_name))

2054

3162

try:

2055

yield (name, special_settings[name]())

2056

except KeyError:

2057

yield (name, value)

2058

2059

tcp_server.clients.update(set(

2060

client_class(name = section,

2061

config= dict(client_config_items(

2062

client_config, section)))

2063

for section in client_config.sections()))

3163

client["secret"] = pgp.decrypt(

3164

client["encrypted_secret"],

3165

client_settings[client_name]["secret"])

3166

except PGPError:

3167

# If decryption fails, we use secret from new settings

3168

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

3169

client_name))

3170

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

3171

["secret"])

3172

3173

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

3174

for client_name in (set(old_client_settings)

3175

- set(client_settings)):

3176

del clients_data[client_name]

3177

for client_name in (set(client_settings)

3178

- set(old_client_settings)):

3179

clients_data[client_name] = client_settings[client_name]

3180

3181

# Create all client objects

3182

for client_name, client in clients_data.items():

3183

tcp_server.clients[client_name] = client_class(

3184

name = client_name,

3185

settings = client,

3186

server_settings = server_settings)

3187

2064

3188

if not tcp_server.clients:

2065

3189

logger.warning("No clients defined")

2066

2067

if not debug:

2068

try:

2069

with pidfile:

2070

pid = os.getpid()

2071

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

2072

del pidfile

2073

except IOError:

2074

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

2075

pidfilename, pid)

2076

except NameError:

2077

# "pidfile" was never created

2078

pass

3190

3191

if not foreground:

3192

if pidfile is not None:

3193

pid = os.getpid()

3194

try:

3195

with pidfile:

3196

print(pid, file=pidfile)

3197

except IOError:

3198

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

3199

pidfilename, pid)

3200

del pidfile

2079

3201

del pidfilename

3202

3203

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

3204

GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,

3205

lambda: main_loop.quit() and False)

3206

3207

if use_dbus:

2080

3208

2081

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

2082

2083

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

2084

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

2085

2086

if use_dbus:

2087

class MandosDBusService(dbus.service.Object):

3209

@alternate_dbus_interfaces(

3210

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

3211

class MandosDBusService(DBusObjectWithObjectManager):

2088

3212

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

3213

2089

3214

def __init__(self):

2090

3215

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

3216

2091

3217

_interface = "se.recompile.Mandos"

2092

3218

2093

3219

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

2100

3226

"D-Bus signal"

2101

3227

pass

2102

3228

3229

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

3230

"true"})

2103

3231

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

2104

3232

def ClientRemoved(self, objpath, name):

2105

3233

"D-Bus signal"

2106

3234

pass

2107

3235

3236

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

3237

"true"})

2108

3238

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

2109

3239

def GetAllClients(self):

2110

3240

"D-Bus method"

2111

return dbus.Array(c.dbus_object_path

2112

for c in tcp_server.clients)

3241

return dbus.Array(c.dbus_object_path for c in

3242

tcp_server.clients.values())

2113

3243

3244

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

3245

"true"})

2114

3246

@dbus.service.method(_interface,

2115

3247

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

2116

3248

def GetAllClientsWithProperties(self):

2117

3249

"D-Bus method"

2118

3250

return dbus.Dictionary(

2119

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

2120

for c in tcp_server.clients),

3251

{ c.dbus_object_path: c.GetAll(

3252

"se.recompile.Mandos.Client")

3253

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

2121

3254

signature="oa{sv}")

2122

3255

2123

3256

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

2124

3257

def RemoveClient(self, object_path):

2125

3258

"D-Bus method"

2126

for c in tcp_server.clients:

3259

for c in tcp_server.clients.values():

2127

3260

if c.dbus_object_path == object_path:

2128

tcp_server.clients.remove(c)

3261

del tcp_server.clients[c.name]

2129

3262

c.remove_from_connection()

2130

# Don't signal anything except ClientRemoved

3263

# Don't signal the disabling

2131

3264

c.disable(quiet=True)

2132

# Emit D-Bus signal

2133

self.ClientRemoved(object_path, c.name)

3265

# Emit D-Bus signal for removal

3266

self.client_removed_signal(c)

2134

3267

return

2135

3268

raise KeyError(object_path)

2136

3269

2137

3270

del _interface

3271

3272

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

3273

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

3274

def GetManagedObjects(self):

3275

"""D-Bus method"""

3276

return dbus.Dictionary(

3277

{ client.dbus_object_path:

3278

dbus.Dictionary(

3279

{ interface: client.GetAll(interface)

3280

for interface in

3281

client._get_all_interface_names()})

3282

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

3283

3284

def client_added_signal(self, client):

3285

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

3286

if use_dbus:

3287

# New standard signal

3288

self.InterfacesAdded(

3289

client.dbus_object_path,

3290

dbus.Dictionary(

3291

{ interface: client.GetAll(interface)

3292

for interface in

3293

client._get_all_interface_names()}))

3294

# Old signal

3295

self.ClientAdded(client.dbus_object_path)

3296

3297

def client_removed_signal(self, client):

3298

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

3299

if use_dbus:

3300

# New standard signal

3301

self.InterfacesRemoved(

3302

client.dbus_object_path,

3303

client._get_all_interface_names())

3304

# Old signal

3305

self.ClientRemoved(client.dbus_object_path,

3306

client.name)

2138

3307

2139

class MandosDBusServiceTransitional(MandosDBusService):

2140

__metaclass__ = AlternateDBusNamesMetaclass

2141

mandos_dbus_service = MandosDBusServiceTransitional()

3308

mandos_dbus_service = MandosDBusService()

2142

3309

2143

3310

def cleanup():

2144

3311

"Cleanup function; run on exit"

2145

service.cleanup()

3312

if zeroconf:

3313

service.cleanup()

2146

3314

2147

3315

multiprocessing.active_children()

3316

wnull.close()

3317

if not (tcp_server.clients or client_settings):

3318

return

3319

3320

# Store client before exiting. Secrets are encrypted with key

3321

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

3322

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

3323

clients = {}

3324

with PGPEngine() as pgp:

3325

for client in tcp_server.clients.values():

3326

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

3327

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

3328

key)

3329

client_dict = {}

3330

3331

# A list of attributes that can not be pickled

3332

# + secret.

3333

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

3334

"checker", "server_settings" }

3335

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

3336

.Object):

3337

exclude.add(name)

3338

3339

client_dict["encrypted_secret"] = (client

3340

.encrypted_secret)

3341

for attr in client.client_structure:

3342

if attr not in exclude:

3343

client_dict[attr] = getattr(client, attr)

3344

3345

clients[client.name] = client_dict

3346

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

3347

3348

try:

3349

with tempfile.NamedTemporaryFile(

3350

mode='wb',

3351

suffix=".pickle",

3352

prefix='clients-',

3353

dir=os.path.dirname(stored_state_path),

3354

delete=False) as stored_state:

3355

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

3356

protocol = 2)

3357

tempname = stored_state.name

3358

os.rename(tempname, stored_state_path)

3359

except (IOError, OSError) as e:

3360

if not debug:

3361

try:

3362

os.remove(tempname)

3363

except NameError:

3364

pass

3365

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

3366

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

3367

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

3368

else:

3369

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

3370

exc_info=e)

3371

raise

3372

3373

# Delete all clients, and settings from config

2148

3374

while tcp_server.clients:

2149

client = tcp_server.clients.pop()

3375

name, client = tcp_server.clients.popitem()

2150

3376

if use_dbus:

2151

3377

client.remove_from_connection()

2152

client.disable_hook = None

2153

# Don't signal anything except ClientRemoved

3378

# Don't signal the disabling

2154

3379

client.disable(quiet=True)

3380

# Emit D-Bus signal for removal

2155

3381

if use_dbus:

2156

# Emit D-Bus signal

2157

mandos_dbus_service.ClientRemoved(client

2158

.dbus_object_path,

2159

client.name)

3382

mandos_dbus_service.client_removed_signal(client)

3383

client_settings.clear()

2160

3384

2161

3385

atexit.register(cleanup)

2162

3386

2163

for client in tcp_server.clients:

3387

for client in tcp_server.clients.values():

2164

3388

if use_dbus:

2165

# Emit D-Bus signal

2166

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2167

client.enable()

3389

# Emit D-Bus signal for adding

3390

mandos_dbus_service.client_added_signal(client)

3391

# Need to initiate checking of clients

3392

if client.enabled:

3393

client.init_checker()

2168

3394

2169

3395

tcp_server.enable()

2170

3396

tcp_server.server_activate()

2171

3397

2172

3398

# Find out what port we got

2173

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

3399

if zeroconf:

3400

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

2174

3401

if use_ipv6:

2175

3402

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

2176

" flowinfo %d, scope_id %d"

2177

% tcp_server.socket.getsockname())

3403

" flowinfo %d, scope_id %d",

3404

*tcp_server.socket.getsockname())

2178

3405

else: # IPv4

2179

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

2180

% tcp_server.socket.getsockname())

3406

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

3407

*tcp_server.socket.getsockname())

2181

3408

2182

3409

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

2183

3410

2184

3411

try:

2185

# From the Avahi example code

2186

try:

2187

service.activate()

2188

except dbus.exceptions.DBusException as error:

2189

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

2190

cleanup()

2191

sys.exit(1)

2192

# End of Avahi example code

3412

if zeroconf:

3413

# From the Avahi example code

3414

try:

3415

service.activate()

3416

except dbus.exceptions.DBusException as error:

3417

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

3418

cleanup()

3419

sys.exit(1)

3420

# End of Avahi example code

2193

3421

2194

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

2195

lambda *args, **kwargs:

2196

(tcp_server.handle_request

2197

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

3422

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

3423

lambda *args, **kwargs:

3424

(tcp_server.handle_request

3425

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

2198

3426

2199

3427

logger.debug("Starting main loop")

2200

3428

main_loop.run()

2201

3429

except AvahiError as error:

2202

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

3430

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

2203

3431

cleanup()

2204

3432

sys.exit(1)

2205

3433

except KeyboardInterrupt: