/mandos/release : revision 237.11.20

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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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try:

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from future_builtins import *

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except ImportError:

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pass

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try:

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import SocketServer as socketserver

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except ImportError:

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import socketserver

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import SocketServer as socketserver

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import socket

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import argparse

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import datetime

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import errno

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try:

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import ConfigParser as configparser

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except ImportError:

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import configparser

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import gnutls.crypto

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import gnutls.connection

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import gnutls.errors

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import gnutls.library.functions

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import gnutls.library.constants

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import gnutls.library.types

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import ConfigParser as configparser

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import sys

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import re

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import os

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import struct

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import fcntl

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import functools

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try:

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import cPickle as pickle

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except ImportError:

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import pickle

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import cPickle as pickle

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import multiprocessing

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import types

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import binascii

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import tempfile

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import itertools

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import collections

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import codecs

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import dbus

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import dbus.service

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from gi.repository import GLib

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import gobject

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import avahi

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from dbus.mainloop.glib import DBusGMainLoop

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import ctypes

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import ctypes.util

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except ImportError:

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SO_BINDTODEVICE = None

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if sys.version_info.major == 2:

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str = unicode

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version = "1.7.7"

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stored_state_file = "clients.pickle"

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version = "1.4.1"

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logger = logging.getLogger()

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syslogger = None

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try:

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if_nametoindex = ctypes.cdll.LoadLibrary(

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

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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

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

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

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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

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

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return interface_index

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def copy_function(func):

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

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if sys.version_info.major == 2:

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return types.FunctionType(func.func_code,

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func.func_globals,

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func.func_name,

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func.func_defaults,

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func.func_closure)

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else:

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return types.FunctionType(func.__code__,

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func.__globals__,

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func.__name__,

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func.__defaults__,

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func.__closure__)

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

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"""init logger and add loglevel"""

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global syslogger

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syslogger = (logging.handlers.SysLogHandler(

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facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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address = "/dev/log"))

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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

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pass

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class PGPEngine(object):

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

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def __init__(self):

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

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self.gpg = "gpg"

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try:

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

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for line in output.splitlines():

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

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if name == "gpg":

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self.gpg = path

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break

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except OSError as e:

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if e.errno != errno.ENOENT:

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raise

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self.gnupgargs = ['--batch',

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'--homedir', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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def __enter__(self):

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return self

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

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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

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topdown = False):

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for filename in files:

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

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for dirname in dirs:

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

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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

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

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

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if len(encoded) > 2048:

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

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

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

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

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return encoded

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def encrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(

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dir=self.tempdir) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(

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dir = self.tempdir) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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# Pretend that we have an Avahi module

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class Avahi(object):

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

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

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

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

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PROTO_INET = 0 # avahi-common/address.h

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PROTO_INET6 = 1 # avahi-common/address.h

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DBUS_NAME = "org.freedesktop.Avahi"

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DBUS_INTERFACE_ENTRY_GROUP = DBUS_NAME + ".EntryGroup"

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DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"

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DBUS_PATH_SERVER = "/"

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def string_array_to_txt_array(self, t):

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

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

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ENTRY_GROUP_ESTABLISHED = 2 # avahi-common/defs.h

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ENTRY_GROUP_COLLISION = 3 # avahi-common/defs.h

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ENTRY_GROUP_FAILURE = 4 # avahi-common/defs.h

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SERVER_INVALID = 0 # avahi-common/defs.h

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SERVER_REGISTERING = 1 # avahi-common/defs.h

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SERVER_RUNNING = 2 # avahi-common/defs.h

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SERVER_COLLISION = 3 # avahi-common/defs.h

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SERVER_FAILURE = 4 # avahi-common/defs.h

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avahi = Avahi()

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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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class AvahiError(Exception):

282

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

283

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self.value = value

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

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**kwargs)

286

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

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def __unicode__(self):

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return unicode(repr(self.value))

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class AvahiServiceError(AvahiError):

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pass

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class AvahiGroupError(AvahiError):

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pass

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Used to optionally bind to the specified interface.

302

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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def __init__(self,

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interface = avahi.IF_UNSPEC,

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name = None,

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servicetype = None,

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port = None,

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TXT = None,

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domain = "",

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host = "",

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max_renames = 32768,

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protocol = avahi.PROTO_UNSPEC,

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bus = None):

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

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

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

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protocol = avahi.PROTO_UNSPEC, bus = None):

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self.interface = interface

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self.name = name

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self.type = servicetype

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

342

343

def rename(self, remove=True):

157

def rename(self):

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

345

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if self.rename_count >= self.max_renames:

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

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" after %i retries, exiting.",

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self.rename_count)

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raise AvahiServiceError("Too many renames")

350

self.name = str(

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self.server.GetAlternativeServiceName(self.name))

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self.rename_count += 1

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self.name = unicode(self.server

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.GetAlternativeServiceName(self.name))

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

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self.name)

355

if remove:

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self.remove()

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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

360

if (error.get_dbus_name()

361

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

362

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

363

return self.rename(remove=False)

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else:

365

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

366

self.cleanup()

367

os._exit(1)

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

173

self.cleanup()

174

os._exit(1)

175

self.rename_count += 1

369

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def remove(self):

370

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

371

178

if self.entry_group_state_changed_match is not None:

373

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self.entry_group_state_changed_match = None

374

181

if self.group is not None:

375

182

self.group.Reset()

376

377

183

def add(self):

378

184

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

379

185

self.remove()

396

202

dbus.UInt16(self.port),

397

203

avahi.string_array_to_txt_array(self.TXT))

398

204

self.group.Commit()

399

400

205

def entry_group_state_changed(self, state, error):

401

206

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

402

207

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

408

213

self.rename()

409

214

elif state == avahi.ENTRY_GROUP_FAILURE:

410

215

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

411

str(error))

412

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

413

216

unicode(error))

217

raise AvahiGroupError("State changed: %s"

218

% unicode(error))

414

219

def cleanup(self):

415

220

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

416

221

if self.group is not None:

417

222

try:

418

223

self.group.Free()

419

224

except (dbus.exceptions.UnknownMethodException,

420

dbus.exceptions.DBusException):

225

dbus.exceptions.DBusException) as e:

421

226

pass

422

227

self.group = None

423

228

self.remove()

424

425

229

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

426

230

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

427

231

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

428

bad_states = {

429

avahi.SERVER_INVALID: "Zeroconf server invalid",

430

avahi.SERVER_REGISTERING: None,

431

avahi.SERVER_COLLISION: "Zeroconf server name collision",

432

avahi.SERVER_FAILURE: "Zeroconf server failure",

433

}

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" }

434

239

if state in bad_states:

435

240

if bad_states[state] is not None:

436

241

if error is None:

439

244

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

440

245

self.cleanup()

441

246

elif state == avahi.SERVER_RUNNING:

442

try:

443

self.add()

444

except dbus.exceptions.DBusException as error:

445

if (error.get_dbus_name()

446

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

447

logger.info("Local Zeroconf service name"

448

" collision.")

449

return self.rename(remove=False)

450

else:

451

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

452

self.cleanup()

453

os._exit(1)

247

self.add()

454

248

else:

455

249

if error is None:

456

250

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

457

251

else:

458

252

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

459

460

253

def activate(self):

461

254

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

462

255

if self.server is None:

466

259

follow_name_owner_changes=True),

467

260

avahi.DBUS_INTERFACE_SERVER)

468

261

self.server.connect_to_signal("StateChanged",

469

self.server_state_changed)

262

self.server_state_changed)

470

263

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

471

264

472

473

265

class AvahiServiceToSyslog(AvahiService):

474

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

266

def rename(self):

475

267

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

476

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

477

syslogger.setFormatter(logging.Formatter(

478

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

479

.format(self.name)))

268

ret = AvahiService.rename(self)

269

syslogger.setFormatter(logging.Formatter

270

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

271

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

272

% self.name))

480

273

return ret

481

274

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

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

747

281

class Client(object):

748

282

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

749

283

750

284

Attributes:

751

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

285

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

752

286

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

753

287

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

754

288

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

755

289

to see if the client lives.

756

290

'None' if no process is running.

757

checker_callback_tag: a GLib event source tag, or None

291

checker_callback_tag: a gobject event source tag, or None

758

292

checker_command: string; External command which is run to check

759

293

if client lives. %() expansions are done at

760

294

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

761

295

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

762

checker_initiator_tag: a GLib event source tag, or None

296

checker_initiator_tag: a gobject event source tag, or None

763

297

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

764

client_structure: Object describing what attributes a client has

765

and is used for storing the client at exit

766

298

current_checker_command: string; current running checker_command

767

disable_initiator_tag: a GLib event source tag, or None

299

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

300

disable_initiator_tag: a gobject event source tag, or None

768

301

enabled: bool()

769

302

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

770

303

uniquely identify the client

772

305

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

773

306

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

774

307

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

775

last_checker_status: integer between 0 and 255 reflecting exit

776

status of last checker. -1 reflects crashed

777

checker, -2 means no checker completed yet.

778

last_checker_signal: The signal which killed the last checker, if

779

last_checker_status is -1

780

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

308

last_enabled: datetime.datetime(); (UTC)

781

309

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

782

310

D-Bus identifiers

783

311

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

784

312

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

785

313

until this client is disabled

786

extended_timeout: extra long timeout when secret has been sent

314

extended_timeout: extra long timeout when password has been sent

787

315

runtime_expansions: Allowed attributes for runtime expansion.

788

316

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

789

317

disabled, or None

790

server_settings: The server_settings dict from main()

791

318

"""

792

319

793

320

runtime_expansions = ("approval_delay", "approval_duration",

794

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

795

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

796

"last_approval_request", "last_checked_ok",

321

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

322

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

797

323

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

798

client_defaults = {

799

"timeout": "PT5M",

800

"extended_timeout": "PT15M",

801

"interval": "PT2M",

802

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

803

"host": "",

804

"approval_delay": "PT0S",

805

"approval_duration": "PT1S",

806

"approved_by_default": "True",

807

"enabled": "True",

808

}

809

810

@staticmethod

811

def config_parser(config):

812

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

813

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

814

with exceptions for any special settings as defined above.

815

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

816

value given the same arguments.

817

"""

818

settings = {}

819

for client_name in config.sections():

820

section = dict(config.items(client_name))

821

client = settings[client_name] = {}

822

823

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

824

# Reformat values from string types to Python types

825

client["approved_by_default"] = config.getboolean(

826

client_name, "approved_by_default")

827

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

828

"enabled")

829

830

# Uppercase and remove spaces from fingerprint for later

831

# comparison purposes with return value from the

832

# fingerprint() function

833

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

834

.replace(" ", ""))

835

if "secret" in section:

836

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

837

.encode("utf-8"),

838

"base64")

839

elif "secfile" in section:

840

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

841

(section["secfile"])),

842

"rb") as secfile:

843

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

844

else:

845

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

846

.format(section))

847

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

848

client["extended_timeout"] = string_to_delta(

849

section["extended_timeout"])

850

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

851

client["approval_delay"] = string_to_delta(

852

section["approval_delay"])

853

client["approval_duration"] = string_to_delta(

854

section["approval_duration"])

855

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

856

client["last_approval_request"] = None

857

client["last_checked_ok"] = None

858

client["last_checker_status"] = -2

859

860

return settings

861

862

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

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."""

863

344

self.name = name

864

if server_settings is None:

865

server_settings = {}

866

self.server_settings = server_settings

867

# adding all client settings

868

for setting, value in settings.items():

869

setattr(self, setting, value)

870

871

if self.enabled:

872

if not hasattr(self, "last_enabled"):

873

self.last_enabled = datetime.datetime.utcnow()

874

if not hasattr(self, "expires"):

875

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

876

+ self.timeout)

877

else:

878

self.last_enabled = None

879

self.expires = None

880

345

if config is None:

346

config = {}

881

347

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(" ", ""))

882

353

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

883

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

884

datetime.datetime.utcnow())

885

886

# attributes specific for this server instance

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

887

375

self.checker = None

888

376

self.checker_initiator_tag = None

889

377

self.disable_initiator_tag = None

378

self.expires = None

890

379

self.checker_callback_tag = None

380

self.checker_command = config["checker"]

891

381

self.current_checker_command = None

892

self.approved = None

382

self.last_connect = None

383

self._approved = None

384

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

385

True)

893

386

self.approvals_pending = 0

894

self.changedstate = multiprocessing_manager.Condition(

895

multiprocessing_manager.Lock())

896

self.client_structure = [attr

897

for attr in self.__dict__.keys()

898

if not attr.startswith("_")]

899

self.client_structure.append("client_structure")

900

901

for name, t in inspect.getmembers(

902

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

903

if not name.startswith("_"):

904

self.client_structure.append(name)

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()))

905

394

906

# Send notice to process children that client state has changed

907

395

def send_changedstate(self):

908

with self.changedstate:

909

self.changedstate.notify_all()

396

self.changedstate.acquire()

397

self.changedstate.notify_all()

398

self.changedstate.release()

910

399

911

400

def enable(self):

912

401

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

913

402

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

914

403

# Already enabled

915

404

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

916

412

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

413

self.disable_initiator_tag = (gobject.timeout_add

414

(self.timeout_milliseconds(),

415

self.disable))

917

416

self.enabled = True

918

417

self.last_enabled = datetime.datetime.utcnow()

919

self.init_checker()

920

self.send_changedstate()

418

# Also start a new checker *right now*.

419

self.start_checker()

921

420

922

421

def disable(self, quiet=True):

923

422

"""Disable this client."""

924

423

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

925

424

return False

926

425

if not quiet:

426

self.send_changedstate()

427

if not quiet:

927

428

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

928

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

929

GLib.source_remove(self.disable_initiator_tag)

429

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

430

gobject.source_remove(self.disable_initiator_tag)

930

431

self.disable_initiator_tag = None

931

432

self.expires = None

932

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

933

GLib.source_remove(self.checker_initiator_tag)

433

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

434

gobject.source_remove(self.checker_initiator_tag)

934

435

self.checker_initiator_tag = None

935

436

self.stop_checker()

437

if self.disable_hook:

438

self.disable_hook(self)

936

439

self.enabled = False

937

if not quiet:

938

self.send_changedstate()

939

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

440

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

940

441

return False

941

442

942

443

def __del__(self):

444

self.disable_hook = None

943

445

self.disable()

944

446

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):

447

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

963

448

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

964

449

self.checker_callback_tag = None

965

450

self.checker = None

966

# Read return code from connection (see call_pipe)

967

returncode = connection.recv()

968

connection.close()

969

970

if returncode >= 0:

971

self.last_checker_status = returncode

972

self.last_checker_signal = None

973

if self.last_checker_status == 0:

451

if os.WIFEXITED(condition):

452

exitstatus = os.WEXITSTATUS(condition)

453

if exitstatus == 0:

974

454

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

975

455

vars(self))

976

456

self.checked_ok()

977

457

else:

978

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

458

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

459

vars(self))

979

460

else:

980

self.last_checker_status = -1

981

self.last_checker_signal = -returncode

982

461

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

983

462

vars(self))

984

return False

985

986

def checked_ok(self):

987

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

988

self.last_checked_ok = datetime.datetime.utcnow()

989

self.last_checker_status = 0

990

self.last_checker_signal = None

991

self.bump_timeout()

992

993

def bump_timeout(self, timeout=None):

994

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

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

"""

995

470

if timeout is None:

996

471

timeout = self.timeout

472

self.last_checked_ok = datetime.datetime.utcnow()

997

473

if self.disable_initiator_tag is not None:

998

GLib.source_remove(self.disable_initiator_tag)

999

self.disable_initiator_tag = None

474

gobject.source_remove(self.disable_initiator_tag)

1000

475

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

1001

self.disable_initiator_tag = GLib.timeout_add(

1002

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

476

self.disable_initiator_tag = (gobject.timeout_add

477

(_timedelta_to_milliseconds

478

(timeout), self.disable))

1003

479

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

1004

480

1005

481

def need_approval(self):

1011

487

If a checker already exists, leave it running and do

1012

488

nothing."""

1013

489

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

1014

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

1015

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

1016

# would inevitably timeout, since no checker would get a

1017

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

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

1018

494

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

1019

495

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

1020

496

# should be.

1021

497

1022

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

1023

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

1024

self.checker.join()

1025

self.checker = None

498

# 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)

1026

511

# Start a new checker if needed

1027

512

if self.checker is None:

1028

# Escape attributes for the shell

1029

escaped_attrs = {

1030

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

1031

for attr in self.runtime_expansions }

1032

513

try:

1033

command = self.checker_command % escaped_attrs

1034

except TypeError as error:

1035

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

1036

self.checker_command,

1037

exc_info=error)

1038

return True # Try again later

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

1039

532

self.current_checker_command = command

1040

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

1041

self.name)

1042

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

1043

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

1044

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

1045

# always replaced by /dev/null.)

1046

# The exception is when not debugging but nevertheless

1047

# running in the foreground; use the previously

1048

# created wnull.

1049

popen_args = { "close_fds": True,

1050

"shell": True,

1051

"cwd": "/" }

1052

if (not self.server_settings["debug"]

1053

and self.server_settings["foreground"]):

1054

popen_args.update({"stdout": wnull,

1055

"stderr": wnull })

1056

pipe = multiprocessing.Pipe(duplex = False)

1057

self.checker = multiprocessing.Process(

1058

target = call_pipe,

1059

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

1060

kwargs = popen_args)

1061

self.checker.start()

1062

self.checker_callback_tag = GLib.io_add_watch(

1063

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

1064

self.checker_callback, pipe[0], command)

1065

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

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

1066

557

return True

1067

558

1068

559

def stop_checker(self):

1069

560

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

1070

561

if self.checker_callback_tag:

1071

GLib.source_remove(self.checker_callback_tag)

562

gobject.source_remove(self.checker_callback_tag)

1072

563

self.checker_callback_tag = None

1073

564

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

1074

565

return

1075

566

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

1076

self.checker.terminate()

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

1077

575

self.checker = None

1078

576

1079

577

1080

def dbus_service_property(dbus_interface,

1081

signature="v",

1082

access="readwrite",

1083

byte_arrays=False):

578

def dbus_service_property(dbus_interface, signature="v",

579

access="readwrite", byte_arrays=False):

1084

580

"""Decorators for marking methods of a DBusObjectWithProperties to

1085

581

become properties on the D-Bus.

1086

582

1095

591

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

1096

592

if byte_arrays and signature != "ay":

1097

593

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

1098

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

1099

594

" signature %r" % signature)

1100

595

def decorator(func):

1101

596

func._dbus_is_property = True

1102

597

func._dbus_interface = dbus_interface

1107

602

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

1108

603

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

1109

604

return func

1110

1111

return decorator

1112

1113

1114

def dbus_interface_annotations(dbus_interface):

1115

"""Decorator for marking functions returning interface annotations

1116

1117

Usage:

1118

1119

@dbus_interface_annotations("org.example.Interface")

1120

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

1121

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

1122

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

1123

"false"}

1124

"""

1125

1126

def decorator(func):

1127

func._dbus_is_interface = True

1128

func._dbus_interface = dbus_interface

1129

func._dbus_name = dbus_interface

1130

return func

1131

1132

return decorator

1133

1134

1135

def dbus_annotations(annotations):

1136

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

1137

Usage:

1138

1139

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

1140

"org.freedesktop.DBus.Property."

1141

"EmitsChangedSignal": "false"})

1142

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

1143

access="r")

1144

def Property_dbus_property(self):

1145

return dbus.Boolean(False)

1146

1147

See also the DBusObjectWithAnnotations class.

1148

"""

1149

1150

def decorator(func):

1151

func._dbus_annotations = annotations

1152

return func

1153

1154

605

return decorator

1155

606

1156

607

1157

608

class DBusPropertyException(dbus.exceptions.DBusException):

1158

609

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

1159

610

"""

1160

pass

611

def __unicode__(self):

612

return unicode(str(self))

1161

613

1162

614

1163

615

class DBusPropertyAccessException(DBusPropertyException):

1172

624

pass

1173

625

1174

626

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):

627

class DBusObjectWithProperties(dbus.service.Object):

1265

628

"""A D-Bus object with properties.

1266

629

1267

630

Classes inheriting from this can use the dbus_service_property

1269

632

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

1270

633

"""

1271

634

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

1272

647

def _get_dbus_property(self, interface_name, property_name):

1273

648

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

1274

649

property with the specified name and interface.

1275

650

"""

1276

for cls in self.__class__.__mro__:

1277

for name, value in inspect.getmembers(

1278

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

651

for cls in self.__class__.__mro__:

652

for name, value in (inspect.getmembers

653

(cls, self._is_dbus_property)):

1279

654

if (value._dbus_name == property_name

1280

655

and value._dbus_interface == interface_name):

1281

656

return value.__get__(self)

1282

657

1283

658

# No such property

1284

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

1285

self.dbus_object_path, interface_name, property_name))

1286

1287

@classmethod

1288

def _get_all_interface_names(cls):

1289

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

1290

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

1291

"_dbus_interface", None)

1292

for x in (inspect.getmro(cls))

1293

for attr in dir(x))

1294

if name is not None)

1295

1296

@dbus.service.method(dbus.PROPERTIES_IFACE,

1297

in_signature="ss",

659

raise DBusPropertyNotFound(self.dbus_object_path + ":"

660

+ interface_name + "."

661

+ property_name)

662

663

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

1298

664

out_signature="v")

1299

665

def Get(self, interface_name, property_name):

1300

666

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

1318

684

# The byte_arrays option is not supported yet on

1319

685

# signatures other than "ay".

1320

686

if prop._dbus_signature != "ay":

1321

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

1322

"'ay' signature {!r}"

1323

.format(prop._dbus_signature))

1324

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

1325

for byte in value))

687

raise ValueError

688

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

689

for byte in value))

1326

690

prop(value)

1327

691

1328

@dbus.service.method(dbus.PROPERTIES_IFACE,

1329

in_signature="s",

692

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

1330

693

out_signature="a{sv}")

1331

694

def GetAll(self, interface_name):

1332

695

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

1334

697

1335

698

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

1336

699

"""

1337

properties = {}

1338

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

700

all = {}

701

for name, prop in self._get_all_dbus_properties():

1339

702

if (interface_name

1340

703

and interface_name != prop._dbus_interface):

1341

704

# Interface non-empty but did not match

1345

708

continue

1346

709

value = prop()

1347

710

if not hasattr(value, "variant_level"):

1348

properties[name] = value

711

all[name] = value

1349

712

continue

1350

properties[name] = type(value)(

1351

value, variant_level = value.variant_level + 1)

1352

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

1353

1354

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

1355

def PropertiesChanged(self, interface_name, changed_properties,

1356

invalidated_properties):

1357

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

1358

standard.

1359

"""

1360

pass

713

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

714

value.variant_level+1)

715

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

1361

716

1362

717

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1363

718

out_signature="s",

1364

719

path_keyword='object_path',

1365

720

connection_keyword='connection')

1366

721

def Introspect(self, object_path, connection):

1367

"""Overloading of standard D-Bus method.

1368

1369

Inserts property tags and interface annotation tags.

722

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

1370

723

"""

1371

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1372

object_path,

1373

connection)

724

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

725

connection)

1374

726

try:

1375

727

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

1376

1377

728

def make_tag(document, name, prop):

1378

729

e = document.createElement("property")

1379

730

e.setAttribute("name", name)

1380

731

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

1381

732

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

1382

733

return e

1383

1384

734

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

1385

# Add property tags

1386

735

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

1387

736

for name, prop

1388

in self._get_all_dbus_things("property")

737

in self._get_all_dbus_properties()

1389

738

if prop._dbus_interface

1390

739

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

1391

740

if_tag.appendChild(tag)

1392

# Add annotation tags for properties

1393

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

1394

annots = dict()

1395

for name, prop in self._get_all_dbus_things(

1396

"property"):

1397

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

1398

and prop._dbus_interface

1399

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

1400

annots.update(getattr(

1401

prop, "_dbus_annotations", {}))

1402

for name, value in annots.items():

1403

ann_tag = document.createElement(

1404

"annotation")

1405

ann_tag.setAttribute("name", name)

1406

ann_tag.setAttribute("value", value)

1407

tag.appendChild(ann_tag)

1408

741

# Add the names to the return values for the

1409

742

# "org.freedesktop.DBus.Properties" methods

1410

743

if (if_tag.getAttribute("name")

1425

758

except (AttributeError, xml.dom.DOMException,

1426

759

xml.parsers.expat.ExpatError) as error:

1427

760

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

1428

exc_info=error)

1429

return xmlstring

1430

1431

try:

1432

dbus.OBJECT_MANAGER_IFACE

1433

except AttributeError:

1434

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

1435

1436

class DBusObjectWithObjectManager(DBusObjectWithAnnotations):

1437

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

1438

1439

Classes inheriting from this exposes the standard

1440

GetManagedObjects call and the InterfacesAdded and

1441

InterfacesRemoved signals on the standard

1442

"org.freedesktop.DBus.ObjectManager" interface.

1443

1444

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

1445

manually.

1446

"""

1447

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

1448

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

1449

def GetManagedObjects(self):

1450

"""This function must be overridden"""

1451

raise NotImplementedError()

1452

1453

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,

1454

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

1455

def InterfacesAdded(self, object_path, interfaces_and_properties):

1456

pass

1457

1458

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

1459

def InterfacesRemoved(self, object_path, interfaces):

1460

pass

1461

1462

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1463

out_signature = "s",

1464

path_keyword = 'object_path',

1465

connection_keyword = 'connection')

1466

def Introspect(self, object_path, connection):

1467

"""Overloading of standard D-Bus method.

1468

1469

Override return argument name of GetManagedObjects to be

1470

"objpath_interfaces_and_properties"

1471

"""

1472

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1473

object_path,

1474

connection)

1475

try:

1476

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

1477

1478

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

1479

# Fix argument name for the GetManagedObjects method

1480

if (if_tag.getAttribute("name")

1481

== dbus.OBJECT_MANAGER_IFACE):

1482

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

1483

if (cn.getAttribute("name")

1484

== "GetManagedObjects"):

1485

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

1486

if (arg.getAttribute("direction")

1487

== "out"):

1488

arg.setAttribute(

1489

"name",

1490

"objpath_interfaces"

1491

"_and_properties")

1492

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

1493

document.unlink()

1494

except (AttributeError, xml.dom.DOMException,

1495

xml.parsers.expat.ExpatError) as error:

1496

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

1497

exc_info = error)

1498

return xmlstring

1499

1500

def datetime_to_dbus(dt, variant_level=0):

761

error)

762

return xmlstring

763

764

765

def datetime_to_dbus (dt, variant_level=0):

1501

766

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

1502

767

if dt is None:

1503

768

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

1504

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

1505

1506

1507

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1508

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

1509

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

1510

interface names according to the "alt_interface_names" mapping.

1511

Usage:

1512

1513

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

1514

"net.example.AlternateInterface"})

1515

class SampleDBusObject(dbus.service.Object):

1516

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

1517

def SampleDBusMethod():

1518

pass

1519

1520

The above "SampleDBusMethod" on "SampleDBusObject" will be

1521

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

1522

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

1523

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

1524

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

1525

1526

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

1527

(from DBusObjectWithProperties) and interfaces (from the

1528

dbus_interface_annotations decorator).

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.

1529

776

"""

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):

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):

1538

784

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

1539

785

# with the wrong interface name

1540

786

if (not hasattr(attribute, "_dbus_interface")

1541

or not attribute._dbus_interface.startswith(

1542

orig_interface_name)):

787

or not attribute._dbus_interface

788

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

1543

789

continue

1544

790

# Create an alternate D-Bus interface name based on

1545

791

# the current name

1546

alt_interface = attribute._dbus_interface.replace(

1547

orig_interface_name, alt_interface_name)

1548

interface_names.add(alt_interface)

792

alt_interface = (attribute._dbus_interface

793

.replace("se.recompile.Mandos",

794

"se.bsnet.fukt.Mandos"))

1549

795

# Is this a D-Bus signal?

1550

796

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

1551

# Extract the original non-method undecorated

1552

# function by black magic

1553

if sys.version_info.major == 2:

1554

nonmethod_func = (dict(

797

# Extract the original non-method function by

798

# black magic

799

nonmethod_func = (dict(

1555

800

zip(attribute.func_code.co_freevars,

1556

attribute.__closure__))

1557

["func"].cell_contents)

1558

else:

1559

nonmethod_func = (dict(

1560

zip(attribute.__code__.co_freevars,

1561

attribute.__closure__))

1562

["func"].cell_contents)

801

attribute.__closure__))["func"]

802

.cell_contents)

1563

803

# Create a new, but exactly alike, function

1564

804

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

1565

805

# with the alternate D-Bus interface name

1566

new_function = copy_function(nonmethod_func)

1567

new_function = (dbus.service.signal(

1568

alt_interface,

1569

attribute._dbus_signature)(new_function))

1570

# Copy annotations, if any

1571

try:

1572

new_function._dbus_annotations = dict(

1573

attribute._dbus_annotations)

1574

except AttributeError:

1575

pass

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)))

1576

815

# Define a creator of a function to call both the

1577

# original and alternate functions, so both the

1578

# original and alternate signals gets sent when

1579

# the function is called

816

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

817

# signals gets sent when the function is called

1580

818

def fixscope(func1, func2):

1581

819

"""This function is a scope container to pass

1582

820

func1 and func2 to the "call_both" function

1583

821

outside of its arguments"""

1584

1585

@functools.wraps(func2)

1586

822

def call_both(*args, **kwargs):

1587

823

"""This function will emit two D-Bus

1588

824

signals by calling func1 and func2"""

1589

825

func1(*args, **kwargs)

1590

826

func2(*args, **kwargs)

1591

# Make wrapper function look like a D-Bus signal

1592

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

1593

if name.startswith("_dbus_"):

1594

setattr(call_both, name, attr)

1595

1596

827

return call_both

1597

828

# Create the "call_both" function and add it to

1598

829

# the class

1599

attr[attrname] = fixscope(attribute, new_function)

830

attr[attrname] = fixscope(attribute,

831

new_function)

1600

832

# Is this a D-Bus method?

1601

833

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

1602

834

# Create a new, but exactly alike, function

1603

835

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

1604

836

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

1605

837

# to the class.

1606

attr[attrname] = (

1607

dbus.service.method(

1608

alt_interface,

1609

attribute._dbus_in_signature,

1610

attribute._dbus_out_signature)

1611

(copy_function(attribute)))

1612

# Copy annotations, if any

1613

try:

1614

attr[attrname]._dbus_annotations = dict(

1615

attribute._dbus_annotations)

1616

except AttributeError:

1617

pass

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)))

1618

848

# Is this a D-Bus property?

1619

849

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

1620

850

# Create a new, but exactly alike, function

1621

851

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

1622

852

# property with the alternate D-Bus interface

1623

853

# name. Add it to the class.

1624

attr[attrname] = (dbus_service_property(

1625

alt_interface, attribute._dbus_signature,

1626

attribute._dbus_access,

1627

attribute._dbus_get_args_options

1628

["byte_arrays"])

1629

(copy_function(attribute)))

1630

# Copy annotations, if any

1631

try:

1632

attr[attrname]._dbus_annotations = dict(

1633

attribute._dbus_annotations)

1634

except AttributeError:

1635

pass

1636

# Is this a D-Bus interface?

1637

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

1638

# Create a new, but exactly alike, function

1639

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

1640

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

1641

# to the class.

1642

attr[attrname] = (

1643

dbus_interface_annotations(alt_interface)

1644

(copy_function(attribute)))

1645

if deprecate:

1646

# Deprecate all alternate interfaces

1647

iname="_AlternateDBusNames_interface_annotation{}"

1648

for interface_name in interface_names:

1649

1650

@dbus_interface_annotations(interface_name)

1651

def func(self):

1652

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

1653

"true" }

1654

# Find an unused name

1655

for aname in (iname.format(i)

1656

for i in itertools.count()):

1657

if aname not in attr:

1658

attr[aname] = func

1659

break

1660

if interface_names:

1661

# Replace the class with a new subclass of it with

1662

# methods, signals, etc. as created above.

1663

if sys.version_info.major == 2:

1664

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

1665

(cls, ), attr)

1666

else:

1667

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

1668

(cls, ), attr)

1669

return cls

1670

1671

return wrapper

1672

1673

1674

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

1675

"se.bsnet.fukt.Mandos"})

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

1676

869

class ClientDBus(Client, DBusObjectWithProperties):

1677

870

"""A Client class using D-Bus

1678

871

1682

875

"""

1683

876

1684

877

runtime_expansions = (Client.runtime_expansions

1685

+ ("dbus_object_path", ))

1686

1687

_interface = "se.recompile.Mandos.Client"

878

+ ("dbus_object_path",))

1688

879

1689

880

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

1690

881

1691

882

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

883

self._approvals_pending = 0

1692

884

self.bus = bus

1693

885

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

1694

886

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

1695

887

# the D-Bus

1696

client_object_name = str(self.name).translate(

888

client_object_name = unicode(self.name).translate(

1697

889

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

1698

890

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

1699

self.dbus_object_path = dbus.ObjectPath(

1700

"/clients/" + client_object_name)

891

self.dbus_object_path = (dbus.ObjectPath

892

("/clients/" + client_object_name))

1701

893

DBusObjectWithProperties.__init__(self, self.bus,

1702

894

self.dbus_object_path)

1703

1704

def notifychangeproperty(transform_func, dbus_name,

1705

type_func=lambda x: x,

1706

variant_level=1,

1707

invalidate_only=False,

1708

_interface=_interface):

895

896

def notifychangeproperty(transform_func,

897

dbus_name, type_func=lambda x: x,

898

variant_level=1):

1709

899

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

1710

900

its changes to DBus.

1711

901

1712

902

transform_fun: Function that takes a value and a variant_level

1713

903

and transforms it to a D-Bus type.

1714

904

dbus_name: D-Bus name of the variable

1716

906

to the D-Bus. Default: no transform

1717

907

variant_level: D-Bus variant level. Default: 1

1718

908

"""

1719

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

1720

909

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

1721

910

def setter(self, value):

1722

911

if hasattr(self, "dbus_object_path"):

1723

912

if (not hasattr(self, attrname) or

1724

913

type_func(getattr(self, attrname, None))

1725

914

!= type_func(value)):

1726

if invalidate_only:

1727

self.PropertiesChanged(

1728

_interface, dbus.Dictionary(),

1729

dbus.Array((dbus_name, )))

1730

else:

1731

dbus_value = transform_func(

1732

type_func(value),

1733

variant_level = variant_level)

1734

self.PropertyChanged(dbus.String(dbus_name),

1735

dbus_value)

1736

self.PropertiesChanged(

1737

_interface,

1738

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

1739

dbus_value }),

1740

dbus.Array())

915

dbus_value = transform_func(type_func(value),

916

variant_level

917

=variant_level)

918

self.PropertyChanged(dbus.String(dbus_name),

919

dbus_value)

1741

920

setattr(self, attrname, value)

1742

921

1743

922

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

1744

923

924

1745

925

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1746

926

approvals_pending = notifychangeproperty(dbus.Boolean,

1747

927

"ApprovalPending",

1749

929

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

1750

930

last_enabled = notifychangeproperty(datetime_to_dbus,

1751

931

"LastEnabled")

1752

checker = notifychangeproperty(

1753

dbus.Boolean, "CheckerRunning",

1754

type_func = lambda checker: checker is not None)

932

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

933

type_func = lambda checker:

934

checker is not None)

1755

935

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1756

936

"LastCheckedOK")

1757

last_checker_status = notifychangeproperty(dbus.Int16,

1758

"LastCheckerStatus")

1759

937

last_approval_request = notifychangeproperty(

1760

938

datetime_to_dbus, "LastApprovalRequest")

1761

939

approved_by_default = notifychangeproperty(dbus.Boolean,

1762

940

"ApprovedByDefault")

1763

approval_delay = notifychangeproperty(

1764

dbus.UInt64, "ApprovalDelay",

1765

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

941

approval_delay = notifychangeproperty(dbus.UInt16,

942

"ApprovalDelay",

943

type_func =

944

_timedelta_to_milliseconds)

1766

945

approval_duration = notifychangeproperty(

1767

dbus.UInt64, "ApprovalDuration",

1768

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

946

dbus.UInt16, "ApprovalDuration",

947

type_func = _timedelta_to_milliseconds)

1769

948

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

1770

timeout = notifychangeproperty(

1771

dbus.UInt64, "Timeout",

1772

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

949

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

950

type_func =

951

_timedelta_to_milliseconds)

1773

952

extended_timeout = notifychangeproperty(

1774

dbus.UInt64, "ExtendedTimeout",

1775

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

1776

interval = notifychangeproperty(

1777

dbus.UInt64, "Interval",

1778

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

953

dbus.UInt16, "ExtendedTimeout",

954

type_func = _timedelta_to_milliseconds)

955

interval = notifychangeproperty(dbus.UInt16,

956

"Interval",

957

type_func =

958

_timedelta_to_milliseconds)

1779

959

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

1780

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

1781

invalidate_only=True)

1782

960

1783

961

del notifychangeproperty

1784

962

1791

969

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

1792

970

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

1793

971

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:

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)

1801

978

# Emit D-Bus signal

1802

979

self.CheckerCompleted(dbus.Int16(exitstatus),

1803

# This is specific to GNU libC

1804

dbus.Int64(exitstatus << 8),

980

dbus.Int64(condition),

1805

981

dbus.String(command))

1806

982

else:

1807

983

# Emit D-Bus signal

1808

984

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

1809

dbus.Int64(

1810

# This is specific to GNU libC

1811

(exitstatus << 8)

1812

| self.last_checker_signal),

985

dbus.Int64(condition),

1813

986

dbus.String(command))

1814

return ret

987

988

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

989

*args, **kwargs)

1815

990

1816

991

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

1817

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

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

1818

997

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

1819

998

# Only if new checker process was started

1820

999

if (self.checker is not None

1824

1003

return r

1825

1004

1826

1005

def _reset_approved(self):

1827

self.approved = None

1006

self._approved = None

1828

1007

return False

1829

1008

1830

1009

def approve(self, value=True):

1831

self.approved = value

1832

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

1833

* 1000), self._reset_approved)

1834

1010

self.send_changedstate()

1011

self._approved = value

1012

gobject.timeout_add(_timedelta_to_milliseconds

1013

(self.approval_duration),

1014

self._reset_approved)

1015

1835

1016

1836

1017

## D-Bus methods, signals & properties

1837

1838

## Interfaces

1018

_interface = "se.recompile.Mandos.Client"

1839

1019

1840

1020

## Signals

1841

1021

1852

1032

pass

1853

1033

1854

1034

# PropertyChanged - signal

1855

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

1856

1035

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

1857

1036

def PropertyChanged(self, property, value):

1858

1037

"D-Bus signal"

1892

1071

self.checked_ok()

1893

1072

1894

1073

# Enable - method

1895

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

1896

1074

@dbus.service.method(_interface)

1897

1075

def Enable(self):

1898

1076

"D-Bus method"

1899

1077

self.enable()

1900

1078

1901

1079

# StartChecker - method

1902

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

1903

1080

@dbus.service.method(_interface)

1904

1081

def StartChecker(self):

1905

1082

"D-Bus method"

1906

1083

self.start_checker()

1907

1084

1908

1085

# Disable - method

1909

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

1910

1086

@dbus.service.method(_interface)

1911

1087

def Disable(self):

1912

1088

"D-Bus method"

1913

1089

self.disable()

1914

1090

1915

1091

# StopChecker - method

1916

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

1917

1092

@dbus.service.method(_interface)

1918

1093

def StopChecker(self):

1919

1094

self.stop_checker()

1926

1101

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

1927

1102

1928

1103

# ApprovedByDefault - property

1929

@dbus_service_property(_interface,

1930

signature="b",

1104

@dbus_service_property(_interface, signature="b",

1931

1105

access="readwrite")

1932

1106

def ApprovedByDefault_dbus_property(self, value=None):

1933

1107

if value is None: # get

1935

1109

self.approved_by_default = bool(value)

1936

1110

1937

1111

# ApprovalDelay - property

1938

@dbus_service_property(_interface,

1939

signature="t",

1112

@dbus_service_property(_interface, signature="t",

1940

1113

access="readwrite")

1941

1114

def ApprovalDelay_dbus_property(self, value=None):

1942

1115

if value is None: # get

1943

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

1944

* 1000)

1116

return dbus.UInt64(self.approval_delay_milliseconds())

1945

1117

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

1946

1118

1947

1119

# ApprovalDuration - property

1948

@dbus_service_property(_interface,

1949

signature="t",

1120

@dbus_service_property(_interface, signature="t",

1950

1121

access="readwrite")

1951

1122

def ApprovalDuration_dbus_property(self, value=None):

1952

1123

if value is None: # get

1953

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

1954

* 1000)

1124

return dbus.UInt64(_timedelta_to_milliseconds(

1125

self.approval_duration))

1955

1126

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

1956

1127

1957

1128

# Name - property

1958

@dbus_annotations(

1959

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

1960

1129

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

1961

1130

def Name_dbus_property(self):

1962

1131

return dbus.String(self.name)

1963

1132

1964

1133

# Fingerprint - property

1965

@dbus_annotations(

1966

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

1967

1134

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

1968

1135

def Fingerprint_dbus_property(self):

1969

1136

return dbus.String(self.fingerprint)

1970

1137

1971

1138

# Host - property

1972

@dbus_service_property(_interface,

1973

signature="s",

1139

@dbus_service_property(_interface, signature="s",

1974

1140

access="readwrite")

1975

1141

def Host_dbus_property(self, value=None):

1976

1142

if value is None: # get

1977

1143

return dbus.String(self.host)

1978

self.host = str(value)

1144

self.host = value

1979

1145

1980

1146

# Created - property

1981

@dbus_annotations(

1982

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

1983

1147

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

1984

1148

def Created_dbus_property(self):

1985

return datetime_to_dbus(self.created)

1149

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

1986

1150

1987

1151

# LastEnabled - property

1988

1152

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

1990

1154

return datetime_to_dbus(self.last_enabled)

1991

1155

1992

1156

# Enabled - property

1993

@dbus_service_property(_interface,

1994

signature="b",

1157

@dbus_service_property(_interface, signature="b",

1995

1158

access="readwrite")

1996

1159

def Enabled_dbus_property(self, value=None):

1997

1160

if value is None: # get

2002

1165

self.disable()

2003

1166

2004

1167

# LastCheckedOK - property

2005

@dbus_service_property(_interface,

2006

signature="s",

1168

@dbus_service_property(_interface, signature="s",

2007

1169

access="readwrite")

2008

1170

def LastCheckedOK_dbus_property(self, value=None):

2009

1171

if value is not None:

2011

1173

return

2012

1174

return datetime_to_dbus(self.last_checked_ok)

2013

1175

2014

# LastCheckerStatus - property

2015

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

2016

def LastCheckerStatus_dbus_property(self):

2017

return dbus.Int16(self.last_checker_status)

2018

2019

1176

# Expires - property

2020

1177

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

2021

1178

def Expires_dbus_property(self):

2027

1184

return datetime_to_dbus(self.last_approval_request)

2028

1185

2029

1186

# Timeout - property

2030

@dbus_service_property(_interface,

2031

signature="t",

1187

@dbus_service_property(_interface, signature="t",

2032

1188

access="readwrite")

2033

1189

def Timeout_dbus_property(self, value=None):

2034

1190

if value is None: # get

2035

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

2036

old_timeout = self.timeout

1191

return dbus.UInt64(self.timeout_milliseconds())

2037

1192

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

2038

# Reschedule disabling

2039

if self.enabled:

2040

now = datetime.datetime.utcnow()

2041

self.expires += self.timeout - old_timeout

2042

if self.expires <= now:

2043

# The timeout has passed

2044

self.disable()

2045

else:

2046

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

2047

is None):

2048

return

2049

GLib.source_remove(self.disable_initiator_tag)

2050

self.disable_initiator_tag = GLib.timeout_add(

2051

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

2052

self.disable)

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))

2053

1213

2054

1214

# ExtendedTimeout - property

2055

@dbus_service_property(_interface,

2056

signature="t",

1215

@dbus_service_property(_interface, signature="t",

2057

1216

access="readwrite")

2058

1217

def ExtendedTimeout_dbus_property(self, value=None):

2059

1218

if value is None: # get

2060

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

2061

* 1000)

1219

return dbus.UInt64(self.extended_timeout_milliseconds())

2062

1220

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

2063

1221

2064

1222

# Interval - property

2065

@dbus_service_property(_interface,

2066

signature="t",

1223

@dbus_service_property(_interface, signature="t",

2067

1224

access="readwrite")

2068

1225

def Interval_dbus_property(self, value=None):

2069

1226

if value is None: # get

2070

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

1227

return dbus.UInt64(self.interval_milliseconds())

2071

1228

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

2072

1229

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

2073

1230

return

2074

if self.enabled:

2075

# Reschedule checker run

2076

GLib.source_remove(self.checker_initiator_tag)

2077

self.checker_initiator_tag = GLib.timeout_add(

2078

value, self.start_checker)

2079

self.start_checker() # Start one now, too

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

2080

1236

2081

1237

# Checker - property

2082

@dbus_service_property(_interface,

2083

signature="s",

1238

@dbus_service_property(_interface, signature="s",

2084

1239

access="readwrite")

2085

1240

def Checker_dbus_property(self, value=None):

2086

1241

if value is None: # get

2087

1242

return dbus.String(self.checker_command)

2088

self.checker_command = str(value)

1243

self.checker_command = value

2089

1244

2090

1245

# CheckerRunning - property

2091

@dbus_service_property(_interface,

2092

signature="b",

1246

@dbus_service_property(_interface, signature="b",

2093

1247

access="readwrite")

2094

1248

def CheckerRunning_dbus_property(self, value=None):

2095

1249

if value is None: # get

2100

1254

self.stop_checker()

2101

1255

2102

1256

# ObjectPath - property

2103

@dbus_annotations(

2104

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

2105

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

2106

1257

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

2107

1258

def ObjectPath_dbus_property(self):

2108

1259

return self.dbus_object_path # is already a dbus.ObjectPath

2109

1260

2110

1261

# Secret = property

2111

@dbus_annotations(

2112

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

2113

"invalidates"})

2114

@dbus_service_property(_interface,

2115

signature="ay",

2116

access="write",

2117

byte_arrays=True)

1262

@dbus_service_property(_interface, signature="ay",

1263

access="write", byte_arrays=True)

2118

1264

def Secret_dbus_property(self, value):

2119

self.secret = bytes(value)

1265

self.secret = str(value)

2120

1266

2121

1267

del _interface

2122

1268

2126

1272

self._pipe = child_pipe

2127

1273

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

2128

1274

if not self._pipe.recv():

2129

raise KeyError(fpr)

1275

raise KeyError()

2130

1276

2131

1277

def __getattribute__(self, name):

2132

if name == '_pipe':

1278

if(name == '_pipe'):

2133

1279

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

2134

1280

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

2135

1281

data = self._pipe.recv()

2136

1282

if data[0] == 'data':

2137

1283

return data[1]

2138

1284

if data[0] == 'function':

2139

2140

1285

def func(*args, **kwargs):

2141

1286

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

2142

1287

return self._pipe.recv()[1]

2143

2144

1288

return func

2145

1289

2146

1290

def __setattr__(self, name, value):

2147

if name == '_pipe':

1291

if(name == '_pipe'):

2148

1292

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

2149

1293

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

2150

1294

1295

class ClientDBusTransitional(ClientDBus):

1296

__metaclass__ = AlternateDBusNamesMetaclass

2151

1297

2152

1298

class ClientHandler(socketserver.BaseRequestHandler, object):

2153

1299

"""A class to handle client connections.

2158

1304

def handle(self):

2159

1305

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

2160

1306

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

2161

str(self.client_address))

1307

unicode(self.client_address))

2162

1308

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

2163

1309

self.server.child_pipe.fileno())

2164

1310

2165

session = gnutls.ClientSession(self.request)

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.

2166

1320

2167

1321

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

2168

1322

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

2172

1326

priority = self.server.gnutls_priority

2173

1327

if priority is None:

2174

1328

priority = "NORMAL"

2175

gnutls.priority_set_direct(session._c_object, priority,

2176

None)

1329

(gnutls.library.functions

1330

.gnutls_priority_set_direct(session._c_object,

1331

priority, None))

2177

1332

2178

1333

# Start communication using the Mandos protocol

2179

1334

# Get protocol number

2181

1336

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

2182

1337

try:

2183

1338

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

2184

raise RuntimeError(line)

1339

raise RuntimeError

2185

1340

except (ValueError, IndexError, RuntimeError) as error:

2186

1341

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

2187

1342

return

2189

1344

# Start GnuTLS connection

2190

1345

try:

2191

1346

session.handshake()

2192

except gnutls.Error as error:

1347

except gnutls.errors.GNUTLSError as error:

2193

1348

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

2194

1349

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

2195

1350

# established. Just abandon the request.

2199

1354

approval_required = False

2200

1355

try:

2201

1356

try:

2202

fpr = self.fingerprint(

2203

self.peer_certificate(session))

2204

except (TypeError, gnutls.Error) as error:

1357

fpr = self.fingerprint(self.peer_certificate

1358

(session))

1359

except (TypeError,

1360

gnutls.errors.GNUTLSError) as error:

2205

1361

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

2206

1362

return

2207

1363

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

2220

1376

while True:

2221

1377

if not client.enabled:

2222

1378

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

2223

client.name)

1379

client.name)

2224

1380

if self.server.use_dbus:

2225

1381

# Emit D-Bus signal

2226

1382

client.Rejected("Disabled")

2227

1383

return

2228

1384

2229

if client.approved or not client.approval_delay:

1385

if client._approved or not client.approval_delay:

2230

1386

#We are approved or approval is disabled

2231

1387

break

2232

elif client.approved is None:

1388

elif client._approved is None:

2233

1389

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

2234

1390

client.name)

2235

1391

if self.server.use_dbus:

2236

1392

# Emit D-Bus signal

2237

1393

client.NeedApproval(

2238

client.approval_delay.total_seconds()

2239

* 1000, client.approved_by_default)

1394

client.approval_delay_milliseconds(),

1395

client.approved_by_default)

2240

1396

else:

2241

1397

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

2242

1398

client.name)

2248

1404

#wait until timeout or approved

2249

1405

time = datetime.datetime.now()

2250

1406

client.changedstate.acquire()

2251

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

1407

(client.changedstate.wait

1408

(float(client._timedelta_to_milliseconds(delay)

1409

/ 1000)))

2252

1410

client.changedstate.release()

2253

1411

time2 = datetime.datetime.now()

2254

1412

if (time2 - time) >= delay:

2265

1423

else:

2266

1424

delay -= time2 - time

2267

1425

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

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

2274

1437

2275

1438

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

2276

1439

# bump the timeout using extended_timeout

2277

client.bump_timeout(client.extended_timeout)

1440

client.checked_ok(client.extended_timeout)

2278

1441

if self.server.use_dbus:

2279

1442

# Emit D-Bus signal

2280

1443

client.GotSecret()

2284

1447

client.approvals_pending -= 1

2285

1448

try:

2286

1449

session.bye()

2287

except gnutls.Error as error:

2288

logger.warning("GnuTLS bye failed",

2289

exc_info=error)

1450

except gnutls.errors.GNUTLSError as error:

1451

logger.warning("GnuTLS bye failed")

2290

1452

2291

1453

@staticmethod

2292

1454

def peer_certificate(session):

2293

1455

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

2294

1456

# If not an OpenPGP certificate...

2295

if (gnutls.certificate_type_get(session._c_object)

2296

!= gnutls.CRT_OPENPGP):

2297

# ...return invalid data

2298

return b""

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

2299

1462

list_size = ctypes.c_uint(1)

2300

cert_list = (gnutls.certificate_get_peers

1463

cert_list = (gnutls.library.functions

1464

.gnutls_certificate_get_peers

2301

1465

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

2302

1466

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

2303

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

1467

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

1468

" certificate")

2304

1469

if list_size.value == 0:

2305

1470

return None

2306

1471

cert = cert_list[0]

2310

1475

def fingerprint(openpgp):

2311

1476

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

2312

1477

# New GnuTLS "datum" with the OpenPGP public key

2313

datum = gnutls.datum_t(

2314

ctypes.cast(ctypes.c_char_p(openpgp),

2315

ctypes.POINTER(ctypes.c_ubyte)),

2316

ctypes.c_uint(len(openpgp)))

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))))

2317

1483

# New empty GnuTLS certificate

2318

crt = gnutls.openpgp_crt_t()

2319

gnutls.openpgp_crt_init(ctypes.byref(crt))

1484

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1485

(gnutls.library.functions

1486

.gnutls_openpgp_crt_init(ctypes.byref(crt)))

2320

1487

# Import the OpenPGP public key into the certificate

2321

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

2322

gnutls.OPENPGP_FMT_RAW)

1488

(gnutls.library.functions

1489

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

1490

gnutls.library.constants

1491

.GNUTLS_OPENPGP_FMT_RAW))

2323

1492

# Verify the self signature in the key

2324

1493

crtverify = ctypes.c_uint()

2325

gnutls.openpgp_crt_verify_self(crt, 0,

2326

ctypes.byref(crtverify))

1494

(gnutls.library.functions

1495

.gnutls_openpgp_crt_verify_self(crt, 0,

1496

ctypes.byref(crtverify)))

2327

1497

if crtverify.value != 0:

2328

gnutls.openpgp_crt_deinit(crt)

2329

raise gnutls.CertificateSecurityError("Verify failed")

1498

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1499

raise (gnutls.errors.CertificateSecurityError

1500

("Verify failed"))

2330

1501

# New buffer for the fingerprint

2331

1502

buf = ctypes.create_string_buffer(20)

2332

1503

buf_len = ctypes.c_size_t()

2333

1504

# Get the fingerprint from the certificate into the buffer

2334

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

2335

ctypes.byref(buf_len))

1505

(gnutls.library.functions

1506

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

1507

ctypes.byref(buf_len)))

2336

1508

# Deinit the certificate

2337

gnutls.openpgp_crt_deinit(crt)

1509

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2338

1510

# Convert the buffer to a Python bytestring

2339

1511

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

2340

1512

# Convert the bytestring to hexadecimal notation

2341

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

1513

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

2342

1514

return hex_fpr

2343

1515

2344

1516

2345

1517

class MultiprocessingMixIn(object):

2346

1518

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

2347

2348

1519

def sub_process_main(self, request, address):

2349

1520

try:

2350

1521

self.finish_request(request, address)

2351

except Exception:

1522

except:

2352

1523

self.handle_error(request, address)

2353

1524

self.close_request(request)

2354

1525

2355

1526

def process_request(self, request, address):

2356

1527

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

2357

1528

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

2358

args = (request, address))

1529

args = (request,

1530

address))

2359

1531

proc.start()

2360

1532

return proc

2361

1533

2362

1534

2363

1535

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

2364

1536

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

2365

2366

1537

def process_request(self, request, client_address):

2367

1538

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

2368

1539

2377

1548

2378

1549

def add_pipe(self, parent_pipe, proc):

2379

1550

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

2380

raise NotImplementedError()

1551

raise NotImplementedError

2381

1552

2382

1553

2383

1554

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

2389

1560

interface: None or a network interface name (string)

2390

1561

use_ipv6: Boolean; to use IPv6 or not

2391

1562

"""

2392

2393

1563

def __init__(self, server_address, RequestHandlerClass,

2394

interface=None,

2395

use_ipv6=True,

2396

socketfd=None):

2397

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

2398

creating a new one with socket.socket().

2399

"""

1564

interface=None, use_ipv6=True):

2400

1565

self.interface = interface

2401

1566

if use_ipv6:

2402

1567

self.address_family = socket.AF_INET6

2403

if socketfd is not None:

2404

# Save the file descriptor

2405

self.socketfd = socketfd

2406

# Save the original socket.socket() function

2407

self.socket_socket = socket.socket

2408

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

2409

#

2410

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

2411

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

2412

# patching socket.socket.)

2413

#

2414

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

2415

@functools.wraps(socket.socket)

2416

def socket_wrapper(*args, **kwargs):

2417

# Restore original function so subsequent calls are

2418

# not affected.

2419

socket.socket = self.socket_socket

2420

del self.socket_socket

2421

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

2422

# saved file descriptor.

2423

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

2424

# Replace socket.socket() function with wrapper

2425

socket.socket = socket_wrapper

2426

# The socketserver.TCPServer.__init__ will call

2427

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

2428

# socket_wrapper(), if socketfd was set.

2429

1568

socketserver.TCPServer.__init__(self, server_address,

2430

1569

RequestHandlerClass)

2431

2432

1570

def server_bind(self):

2433

1571

"""This overrides the normal server_bind() function

2434

1572

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

2440

1578

self.interface)

2441

1579

else:

2442

1580

try:

2443

self.socket.setsockopt(

2444

socket.SOL_SOCKET, SO_BINDTODEVICE,

2445

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

1581

self.socket.setsockopt(socket.SOL_SOCKET,

1582

SO_BINDTODEVICE,

1583

str(self.interface

1584

+ '\0'))

2446

1585

except socket.error as error:

2447

if error.errno == errno.EPERM:

2448

logger.error("No permission to bind to"

2449

" interface %s", self.interface)

2450

elif error.errno == errno.ENOPROTOOPT:

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:

2451

1591

logger.error("SO_BINDTODEVICE not available;"

2452

1592

" cannot bind to interface %s",

2453

1593

self.interface)

2454

elif error.errno == errno.ENODEV:

2455

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

2456

" cannot bind", self.interface)

2457

1594

else:

2458

1595

raise

2459

1596

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

2462

1599

if self.address_family == socket.AF_INET6:

2463

1600

any_address = "::" # in6addr_any

2464

1601

else:

2465

any_address = "0.0.0.0" # INADDR_ANY

1602

any_address = socket.INADDR_ANY

2466

1603

self.server_address = (any_address,

2467

1604

self.server_address[1])

2468

1605

elif not self.server_address[1]:

2469

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

1606

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

1607

0)

2470

1608

# if self.interface:

2471

1609

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

2472

1610

# 0, # port

2484

1622

gnutls_priority GnuTLS priority string

2485

1623

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

2486

1624

2487

Assumes a GLib.MainLoop event loop.

1625

Assumes a gobject.MainLoop event loop.

2488

1626

"""

2489

2490

1627

def __init__(self, server_address, RequestHandlerClass,

2491

interface=None,

2492

use_ipv6=True,

2493

clients=None,

2494

gnutls_priority=None,

2495

use_dbus=True,

2496

socketfd=None):

1628

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

1629

gnutls_priority=None, use_dbus=True):

2497

1630

self.enabled = False

2498

1631

self.clients = clients

2499

1632

if self.clients is None:

2500

self.clients = {}

1633

self.clients = set()

2501

1634

self.use_dbus = use_dbus

2502

1635

self.gnutls_priority = gnutls_priority

2503

1636

IPv6_TCPServer.__init__(self, server_address,

2504

1637

RequestHandlerClass,

2505

1638

interface = interface,

2506

use_ipv6 = use_ipv6,

2507

socketfd = socketfd)

2508

1639

use_ipv6 = use_ipv6)

2509

1640

def server_activate(self):

2510

1641

if self.enabled:

2511

1642

return socketserver.TCPServer.server_activate(self)

2515

1646

2516

1647

def add_pipe(self, parent_pipe, proc):

2517

1648

# Call "handle_ipc" for both data and EOF events

2518

GLib.io_add_watch(

2519

parent_pipe.fileno(),

2520

GLib.IO_IN | GLib.IO_HUP,

2521

functools.partial(self.handle_ipc,

2522

parent_pipe = parent_pipe,

2523

proc = proc))

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))

2524

1655

2525

def handle_ipc(self, source, condition,

2526

parent_pipe=None,

2527

proc = None,

2528

client_object=None):

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)

2529

1672

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

2530

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

1673

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

2531

1674

# Wait for other process to exit

2532

1675

proc.join()

2533

1676

return False

2540

1683

fpr = request[1]

2541

1684

address = request[2]

2542

1685

2543

for c in self.clients.values():

1686

for c in self.clients:

2544

1687

if c.fingerprint == fpr:

2545

1688

client = c

2546

1689

break

2554

1697

parent_pipe.send(False)

2555

1698

return False

2556

1699

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))

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))

2564

1708

parent_pipe.send(True)

2565

1709

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

2566

1710

# same fileno

2572

1716

2573

1717

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

2574

1718

funcname)(*args,

2575

**kwargs)))

1719

**kwargs)))

2576

1720

2577

1721

if command == 'getattr':

2578

1722

attrname = request[1]

2579

if isinstance(client_object.__getattribute__(attrname),

2580

collections.Callable):

2581

parent_pipe.send(('function', ))

1723

if callable(client_object.__getattribute__(attrname)):

1724

parent_pipe.send(('function',))

2582

1725

else:

2583

parent_pipe.send((

2584

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

1726

parent_pipe.send(('data', client_object

1727

.__getattribute__(attrname)))

2585

1728

2586

1729

if command == 'setattr':

2587

1730

attrname = request[1]

2591

1734

return True

2592

1735

2593

1736

2594

def rfc3339_duration_to_delta(duration):

2595

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

2596

2597

>>> rfc3339_duration_to_delta("P7D")

2598

datetime.timedelta(7)

2599

>>> rfc3339_duration_to_delta("PT60S")

2600

datetime.timedelta(0, 60)

2601

>>> rfc3339_duration_to_delta("PT60M")

2602

datetime.timedelta(0, 3600)

2603

>>> rfc3339_duration_to_delta("PT24H")

2604

datetime.timedelta(1)

2605

>>> rfc3339_duration_to_delta("P1W")

2606

datetime.timedelta(7)

2607

>>> rfc3339_duration_to_delta("PT5M30S")

2608

datetime.timedelta(0, 330)

2609

>>> rfc3339_duration_to_delta("P1DT3M20S")

2610

datetime.timedelta(1, 200)

2611

"""

2612

2613

# Parsing an RFC 3339 duration with regular expressions is not

2614

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

2615

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

2616

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

2617

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

2618

# avoid excessive use of external libraries.

2619

2620

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

2621

Token = collections.namedtuple("Token", (

2622

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

2623

# a "group" containing digits

2624

"value", # datetime.timedelta or None

2625

"followers")) # Tokens valid after this token

2626

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

2627

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

2628

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

2629

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

2630

datetime.timedelta(seconds=1),

2631

frozenset((token_end, )))

2632

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

2633

datetime.timedelta(minutes=1),

2634

frozenset((token_second, token_end)))

2635

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

2636

datetime.timedelta(hours=1),

2637

frozenset((token_minute, token_end)))

2638

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

2639

None,

2640

frozenset((token_hour, token_minute,

2641

token_second)))

2642

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

2643

datetime.timedelta(days=1),

2644

frozenset((token_time, token_end)))

2645

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

2646

datetime.timedelta(weeks=4),

2647

frozenset((token_day, token_end)))

2648

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

2649

datetime.timedelta(weeks=52),

2650

frozenset((token_month, token_end)))

2651

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

2652

datetime.timedelta(weeks=1),

2653

frozenset((token_end, )))

2654

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

2655

frozenset((token_year, token_month,

2656

token_day, token_time,

2657

token_week)))

2658

# Define starting values

2659

value = datetime.timedelta() # Value so far

2660

found_token = None

2661

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

2662

s = duration # String left to parse

2663

# Loop until end token is found

2664

while found_token is not token_end:

2665

# Search for any currently valid tokens

2666

for token in followers:

2667

match = token.regexp.match(s)

2668

if match is not None:

2669

# Token found

2670

if token.value is not None:

2671

# Value found, parse digits

2672

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

2673

# Add to value so far

2674

value += factor * token.value

2675

# Strip token from string

2676

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

2677

# Go to found token

2678

found_token = token

2679

# Set valid next tokens

2680

followers = found_token.followers

2681

break

2682

else:

2683

# No currently valid tokens were found

2684

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

2685

.format(duration))

2686

# End token found

2687

return value

2688

2689

2690

1737

def string_to_delta(interval):

2691

1738

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

2692

1739

2703

1750

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

2704

1751

datetime.timedelta(0, 330)

2705

1752

"""

2706

2707

try:

2708

return rfc3339_duration_to_delta(interval)

2709

except ValueError:

2710

pass

2711

2712

1753

timevalue = datetime.timedelta(0)

2713

1754

for s in interval.split():

2714

1755

try:

2715

suffix = s[-1]

1756

suffix = unicode(s[-1])

2716

1757

value = int(s[:-1])

2717

1758

if suffix == "d":

2718

1759

delta = datetime.timedelta(value)

2725

1766

elif suffix == "w":

2726

1767

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

2727

1768

else:

2728

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

2729

except IndexError as e:

1769

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

1770

except (ValueError, IndexError) as e:

2730

1771

raise ValueError(*(e.args))

2731

1772

timevalue += delta

2732

1773

return timevalue

2733

1774

2734

1775

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

2735

1800

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

2736

1801

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

2737

1802

2745

1810

sys.exit()

2746

1811

if not noclose:

2747

1812

# Close all standard open file descriptors

2748

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

1813

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

2749

1814

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

2750

1815

raise OSError(errno.ENODEV,

2751

"{} not a character device"

2752

.format(os.devnull))

1816

"%s not a character device"

1817

% os.path.devnull)

2753

1818

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

2754

1819

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

2755

1820

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

2764

1829

2765

1830

parser = argparse.ArgumentParser()

2766

1831

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

2767

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

1832

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

2768

1833

help="show version number and exit")

2769

1834

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

2770

1835

help="Bind to interface IF")

2776

1841

help="Run self-test")

2777

1842

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

2778

1843

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

2779

" to terminal", default=None)

1844

" to terminal")

2780

1845

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

2781

1846

help="Debug level for stdout output")

2782

1847

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

2789

1854

" files")

2790

1855

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

2791

1856

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

2792

" system bus interface", default=None)

1857

" system bus interface")

2793

1858

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

2794

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

2795

default=None)

2796

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

2797

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

2798

" state", default=None)

2799

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

2800

help="Specify a file descriptor to a network"

2801

" socket to use instead of creating one")

2802

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

2803

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

2804

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

2805

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

2806

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

2807

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

2808

default=None)

2809

1859

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

2810

1860

options = parser.parse_args()

2811

1861

2812

1862

if options.check:

2813

1863

import doctest

2814

fail_count, test_count = doctest.testmod()

2815

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

1864

doctest.testmod()

1865

sys.exit()

2816

1866

2817

1867

# Default values for config file for server-global settings

2818

1868

server_defaults = { "interface": "",

2820

1870

"port": "",

2821

1871

"debug": "False",

2822

1872

"priority":

2823

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

2824

":+SIGN-DSA-SHA256",

1873

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

2825

1874

"servicename": "Mandos",

2826

1875

"use_dbus": "True",

2827

1876

"use_ipv6": "True",

2828

1877

"debuglevel": "",

2829

"restore": "True",

2830

"socket": "",

2831

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

2832

"foreground": "False",

2833

"zeroconf": "True",

2834

}

1878

}

2835

1879

2836

1880

# Parse config file for server-global settings

2837

1881

server_config = configparser.SafeConfigParser(server_defaults)

2838

1882

del server_defaults

2839

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

1883

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

1884

"mandos.conf"))

2840

1885

# Convert the SafeConfigParser object to a dict

2841

1886

server_settings = server_config.defaults()

2842

1887

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

2843

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

1888

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

2844

1889

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

2845

1890

option)

2846

1891

if server_settings["port"]:

2847

1892

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

2848

1893

"port")

2849

if server_settings["socket"]:

2850

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

2851

"socket")

2852

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

2853

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

2854

# happen with a supplied network socket.

2855

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

2856

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

2857

["socket"])

2858

1894

del server_config

2859

1895

2860

1896

# Override the settings from the config file with command line

2861

1897

# options, if set.

2862

1898

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

2863

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

2864

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

2865

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

1899

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

1900

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

2866

1901

value = getattr(options, option)

2867

1902

if value is not None:

2868

1903

server_settings[option] = value

2869

1904

del options

2870

1905

# Force all strings to be unicode

2871

1906

for option in server_settings.keys():

2872

if isinstance(server_settings[option], bytes):

2873

server_settings[option] = (server_settings[option]

2874

.decode("utf-8"))

2875

# Force all boolean options to be boolean

2876

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

2877

"foreground", "zeroconf"):

2878

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

2879

# Debug implies foreground

2880

if server_settings["debug"]:

2881

server_settings["foreground"] = True

1907

if type(server_settings[option]) is str:

1908

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

2882

1909

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

2883

1910

2884

1911

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

2885

1912

2886

if (not server_settings["zeroconf"]

2887

and not (server_settings["port"]

2888

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

2889

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

2890

2891

1913

# For convenience

2892

1914

debug = server_settings["debug"]

2893

1915

debuglevel = server_settings["debuglevel"]

2894

1916

use_dbus = server_settings["use_dbus"]

2895

1917

use_ipv6 = server_settings["use_ipv6"]

2896

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

2897

stored_state_file)

2898

foreground = server_settings["foreground"]

2899

zeroconf = server_settings["zeroconf"]

2900

2901

if debug:

2902

initlogger(debug, logging.DEBUG)

2903

else:

2904

if not debuglevel:

2905

initlogger(debug)

2906

else:

2907

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

2908

initlogger(debug, level)

2909

1918

2910

1919

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

2911

syslogger.setFormatter(

2912

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

2913

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

2914

server_settings["servicename"])))

1920

syslogger.setFormatter(logging.Formatter

1921

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

1922

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

1923

% server_settings["servicename"]))

2915

1924

2916

1925

# Parse config file with clients

2917

client_config = configparser.SafeConfigParser(Client

2918

.client_defaults)

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)

2919

1935

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

2920

1936

"clients.conf"))

2921

1937

2922

1938

global mandos_dbus_service

2923

1939

mandos_dbus_service = None

2924

1940

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

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"

2941

1952

try:

2942

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

2943

except IOError as e:

2944

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

2945

exc_info=e)

1953

pidfile = open(pidfilename, "w")

1954

except IOError:

1955

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

2946

1956

2947

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

2948

("mandos", "mandos"),

2949

("nobody", "nogroup")):

1957

try:

1958

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

1959

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

1960

except KeyError:

2950

1961

try:

2951

uid = pwd.getpwnam(name).pw_uid

2952

gid = pwd.getpwnam(group).pw_gid

2953

break

1962

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

1963

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

2954

1964

except KeyError:

2955

continue

2956

else:

2957

uid = 65534

2958

gid = 65534

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

2959

1971

try:

2960

1972

os.setgid(gid)

2961

1973

os.setuid(uid)

2962

if debug:

2963

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

2964

gid))

2965

1974

except OSError as error:

2966

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

2967

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

2968

if error.errno != errno.EPERM:

2969

raise

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)

2970

1983

2971

1984

if debug:

1985

logger.setLevel(logging.DEBUG)

2972

1986

# Enable all possible GnuTLS debugging

2973

1987

2974

1988

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

2975

1989

# - GnuTLS manual

2976

gnutls.global_set_log_level(11)

1990

gnutls.library.functions.gnutls_global_set_log_level(11)

2977

1991

2978

@gnutls.log_func

1992

@gnutls.library.types.gnutls_log_func

2979

1993

def debug_gnutls(level, string):

2980

1994

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

2981

1995

2982

gnutls.global_set_log_function(debug_gnutls)

1996

(gnutls.library.functions

1997

.gnutls_global_set_log_function(debug_gnutls))

2983

1998

2984

1999

# Redirect stdin so all checkers get /dev/null

2985

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

2000

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

2986

2001

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

2987

2002

if null > 2:

2988

2003

os.close(null)

2004

else:

2005

# No console logging

2006

logger.removeHandler(console)

2989

2007

2990

2008

# Need to fork before connecting to D-Bus

2991

if not foreground:

2009

if not debug:

2992

2010

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

2993

2011

daemon()

2994

2012

2995

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

2996

# to inform GLib that threads will be used.

2997

GLib.threads_init()

2998

2999

2013

global main_loop

3000

2014

# From the Avahi example code

3001

DBusGMainLoop(set_as_default=True)

3002

main_loop = GLib.MainLoop()

2015

DBusGMainLoop(set_as_default=True )

2016

main_loop = gobject.MainLoop()

3003

2017

bus = dbus.SystemBus()

3004

2018

# End of Avahi example code

3005

2019

if use_dbus:

3006

2020

try:

3007

2021

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

3008

bus,

3009

do_not_queue=True)

3010

old_bus_name = dbus.service.BusName(

3011

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

3012

do_not_queue=True)

3013

except dbus.exceptions.DBusException as e:

3014

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

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")

3015

2028

use_dbus = False

3016

2029

server_settings["use_dbus"] = False

3017

2030

tcp_server.use_dbus = False

3018

if zeroconf:

3019

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

3020

service = AvahiServiceToSyslog(

3021

name = server_settings["servicename"],

3022

servicetype = "_mandos._tcp",

3023

protocol = protocol,

3024

bus = bus)

3025

if server_settings["interface"]:

3026

service.interface = if_nametoindex(

3027

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

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"])))

3028

2039

3029

2040

global multiprocessing_manager

3030

2041

multiprocessing_manager = multiprocessing.Manager()

3031

2042

3032

2043

client_class = Client

3033

2044

if use_dbus:

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))

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):

3162

2054

try:

3163

client["secret"] = pgp.decrypt(

3164

client["encrypted_secret"],

3165

client_settings[client_name]["secret"])

3166

except PGPError:

3167

# If decryption fails, we use secret from new settings

3168

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

3169

client_name))

3170

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

3171

["secret"])

3172

3173

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

3174

for client_name in (set(old_client_settings)

3175

- set(client_settings)):

3176

del clients_data[client_name]

3177

for client_name in (set(client_settings)

3178

- set(old_client_settings)):

3179

clients_data[client_name] = client_settings[client_name]

3180

3181

# Create all client objects

3182

for client_name, client in clients_data.items():

3183

tcp_server.clients[client_name] = client_class(

3184

name = client_name,

3185

settings = client,

3186

server_settings = server_settings)

3187

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()))

3188

2064

if not tcp_server.clients:

3189

2065

logger.warning("No clients defined")

3190

3191

if not foreground:

3192

if pidfile is not None:

3193

pid = os.getpid()

3194

try:

3195

with pidfile:

3196

print(pid, file=pidfile)

3197

except IOError:

3198

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

3199

pidfilename, pid)

3200

del pidfile

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

3201

2079

del pidfilename

2080

2081

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

3202

2082

3203

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

3204

GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,

3205

lambda: main_loop.quit() and False)

2083

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

2084

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

3206

2085

3207

2086

if use_dbus:

3208

3209

@alternate_dbus_interfaces(

3210

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

3211

class MandosDBusService(DBusObjectWithObjectManager):

2087

class MandosDBusService(dbus.service.Object):

3212

2088

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

3213

3214

2089

def __init__(self):

3215

2090

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

3216

3217

2091

_interface = "se.recompile.Mandos"

3218

2092

3219

2093

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

3226

2100

"D-Bus signal"

3227

2101

pass

3228

2102

3229

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

3230

"true"})

3231

2103

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

3232

2104

def ClientRemoved(self, objpath, name):

3233

2105

"D-Bus signal"

3234

2106

pass

3235

2107

3236

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

3237

"true"})

3238

2108

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

3239

2109

def GetAllClients(self):

3240

2110

"D-Bus method"

3241

return dbus.Array(c.dbus_object_path for c in

3242

tcp_server.clients.values())

2111

return dbus.Array(c.dbus_object_path

2112

for c in tcp_server.clients)

3243

2113

3244

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

3245

"true"})

3246

2114

@dbus.service.method(_interface,

3247

2115

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

3248

2116

def GetAllClientsWithProperties(self):

3249

2117

"D-Bus method"

3250

2118

return dbus.Dictionary(

3251

{ c.dbus_object_path: c.GetAll(

3252

"se.recompile.Mandos.Client")

3253

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

2119

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

2120

for c in tcp_server.clients),

3254

2121

signature="oa{sv}")

3255

2122

3256

2123

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

3257

2124

def RemoveClient(self, object_path):

3258

2125

"D-Bus method"

3259

for c in tcp_server.clients.values():

2126

for c in tcp_server.clients:

3260

2127

if c.dbus_object_path == object_path:

3261

del tcp_server.clients[c.name]

2128

tcp_server.clients.remove(c)

3262

2129

c.remove_from_connection()

3263

# Don't signal the disabling

2130

# Don't signal anything except ClientRemoved

3264

2131

c.disable(quiet=True)

3265

# Emit D-Bus signal for removal

3266

self.client_removed_signal(c)

2132

# Emit D-Bus signal

2133

self.ClientRemoved(object_path, c.name)

3267

2134

return

3268

2135

raise KeyError(object_path)

3269

2136

3270

2137

del _interface

3271

3272

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

3273

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

3274

def GetManagedObjects(self):

3275

"""D-Bus method"""

3276

return dbus.Dictionary(

3277

{ client.dbus_object_path:

3278

dbus.Dictionary(

3279

{ interface: client.GetAll(interface)

3280

for interface in

3281

client._get_all_interface_names()})

3282

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

3283

3284

def client_added_signal(self, client):

3285

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

3286

if use_dbus:

3287

# New standard signal

3288

self.InterfacesAdded(

3289

client.dbus_object_path,

3290

dbus.Dictionary(

3291

{ interface: client.GetAll(interface)

3292

for interface in

3293

client._get_all_interface_names()}))

3294

# Old signal

3295

self.ClientAdded(client.dbus_object_path)

3296

3297

def client_removed_signal(self, client):

3298

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

3299

if use_dbus:

3300

# New standard signal

3301

self.InterfacesRemoved(

3302

client.dbus_object_path,

3303

client._get_all_interface_names())

3304

# Old signal

3305

self.ClientRemoved(client.dbus_object_path,

3306

client.name)

3307

2138

3308

mandos_dbus_service = MandosDBusService()

2139

class MandosDBusServiceTransitional(MandosDBusService):

2140

__metaclass__ = AlternateDBusNamesMetaclass

2141

mandos_dbus_service = MandosDBusServiceTransitional()

3309

2142

3310

2143

def cleanup():

3311

2144

"Cleanup function; run on exit"

3312

if zeroconf:

3313

service.cleanup()

2145

service.cleanup()

3314

2146

3315

2147

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

3374

2148

while tcp_server.clients:

3375

name, client = tcp_server.clients.popitem()

2149

client = tcp_server.clients.pop()

3376

2150

if use_dbus:

3377

2151

client.remove_from_connection()

3378

# Don't signal the disabling

2152

client.disable_hook = None

2153

# Don't signal anything except ClientRemoved

3379

2154

client.disable(quiet=True)

3380

# Emit D-Bus signal for removal

3381

2155

if use_dbus:

3382

mandos_dbus_service.client_removed_signal(client)

3383

client_settings.clear()

2156

# Emit D-Bus signal

2157

mandos_dbus_service.ClientRemoved(client

2158

.dbus_object_path,

2159

client.name)

3384

2160

3385

2161

atexit.register(cleanup)

3386

2162

3387

for client in tcp_server.clients.values():

2163

for client in tcp_server.clients:

3388

2164

if use_dbus:

3389

# Emit D-Bus signal for adding

3390

mandos_dbus_service.client_added_signal(client)

3391

# Need to initiate checking of clients

3392

if client.enabled:

3393

client.init_checker()

2165

# Emit D-Bus signal

2166

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2167

client.enable()

3394

2168

3395

2169

tcp_server.enable()

3396

2170

tcp_server.server_activate()

3397

2171

3398

2172

# Find out what port we got

3399

if zeroconf:

3400

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

2173

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

3401

2174

if use_ipv6:

3402

2175

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

3403

" flowinfo %d, scope_id %d",

3404

*tcp_server.socket.getsockname())

2176

" flowinfo %d, scope_id %d"

2177

% tcp_server.socket.getsockname())

3405

2178

else: # IPv4

3406

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

3407

*tcp_server.socket.getsockname())

2179

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

2180

% tcp_server.socket.getsockname())

3408

2181

3409

2182

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

3410

2183

3411

2184

try:

3412

if zeroconf:

3413

# From the Avahi example code

3414

try:

3415

service.activate()

3416

except dbus.exceptions.DBusException as error:

3417

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

3418

cleanup()

3419

sys.exit(1)

3420

# End of Avahi example code

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

3421

2193

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))

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))

3426

2198

3427

2199

logger.debug("Starting main loop")

3428

2200

main_loop.run()

3429

2201

except AvahiError as error:

3430

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

2202

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

3431

2203

cleanup()

3432

2204

sys.exit(1)

3433

2205

except KeyboardInterrupt: