/mandos/trunk : revision 535.1.8

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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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import xml.dom.minidom

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import inspect

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import GnuPGInterface

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try:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except ImportError:

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SO_BINDTODEVICE = None

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if sys.version_info.major == 2:

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str = unicode

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version = "1.7.6"

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version = "1.4.1"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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syslogger = None

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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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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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if_nametoindex = (ctypes.cdll.LoadLibrary

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

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

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interface))

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

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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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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.gnupg = GnuPGInterface.GnuPG()

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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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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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self.gnupg.options.extra_args.extend(['--force-mdc',

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'--quiet'])

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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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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 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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return b"mandos" + binascii.hexlify(password)

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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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self.gnupg.passphrase = self.password_encode(password)

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with open(os.devnull) as devnull:

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try:

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proc = self.gnupg.run(['--symmetric'],

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create_fhs=['stdin', 'stdout'],

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attach_fhs={'stderr': devnull})

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with contextlib.closing(proc.handles['stdin']) as f:

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f.write(data)

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with contextlib.closing(proc.handles['stdout']) as f:

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ciphertext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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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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self.gnupg.passphrase = self.password_encode(password)

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with open(os.devnull) as devnull:

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try:

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proc = self.gnupg.run(['--decrypt'],

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create_fhs=['stdin', 'stdout'],

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attach_fhs={'stderr': devnull})

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with contextlib.closing(proc.handles['stdin'] ) as f:

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f.write(data)

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with contextlib.closing(proc.handles['stdout']) as f:

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decrypted_plaintext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return decrypted_plaintext

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# Pretend that we have an Avahi module

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class Avahi(object):

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

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

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

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

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PROTO_INET = 0 # avahi-common/address.h

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PROTO_INET6 = 1 # avahi-common/address.h

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DBUS_NAME = "org.freedesktop.Avahi"

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DBUS_INTERFACE_ENTRY_GROUP = DBUS_NAME + ".EntryGroup"

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DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"

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DBUS_PATH_SERVER = "/"

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def string_array_to_txt_array(self, t):

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

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

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ENTRY_GROUP_ESTABLISHED = 2 # avahi-common/defs.h

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ENTRY_GROUP_COLLISION = 3 # avahi-common/defs.h

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ENTRY_GROUP_FAILURE = 4 # avahi-common/defs.h

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SERVER_INVALID = 0 # avahi-common/defs.h

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SERVER_REGISTERING = 1 # avahi-common/defs.h

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SERVER_RUNNING = 2 # avahi-common/defs.h

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SERVER_COLLISION = 3 # avahi-common/defs.h

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SERVER_FAILURE = 4 # avahi-common/defs.h

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avahi = Avahi()

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class AvahiError(Exception):

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

283

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self.value = value

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

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**kwargs)

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

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def __unicode__(self):

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return unicode(repr(self.value))

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class AvahiServiceError(AvahiError):

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pass

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class AvahiGroupError(AvahiError):

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pass

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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def __init__(self,

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interface = avahi.IF_UNSPEC,

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name = None,

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servicetype = None,

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port = None,

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TXT = None,

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domain = "",

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host = "",

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max_renames = 32768,

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protocol = avahi.PROTO_UNSPEC,

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bus = None):

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

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

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

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protocol = avahi.PROTO_UNSPEC, bus = None):

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self.interface = interface

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self.name = name

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self.type = servicetype

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self, remove=True):

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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266

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

347

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" after %i retries, exiting.",

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self.rename_count)

349

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raise AvahiServiceError("Too many renames")

350

self.name = str(

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self.server.GetAlternativeServiceName(self.name))

352

self.rename_count += 1

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self.name = unicode(self.server

271

.GetAlternativeServiceName(self.name))

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

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self.name)

355

if remove:

356

self.remove()

274

self.remove()

357

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try:

358

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self.add()

359

277

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)

364

else:

365

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

366

self.cleanup()

367

os._exit(1)

368

278

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

279

self.cleanup()

280

os._exit(1)

281

self.rename_count += 1

369

282

def remove(self):

370

283

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

371

284

if self.entry_group_state_changed_match is not None:

373

286

self.entry_group_state_changed_match = None

374

287

if self.group is not None:

375

288

self.group.Reset()

376

377

289

def add(self):

378

290

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

379

291

self.remove()

396

308

dbus.UInt16(self.port),

397

309

avahi.string_array_to_txt_array(self.TXT))

398

310

self.group.Commit()

399

400

311

def entry_group_state_changed(self, state, error):

401

312

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

402

313

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

408

319

self.rename()

409

320

elif state == avahi.ENTRY_GROUP_FAILURE:

410

321

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

411

str(error))

412

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

413

322

unicode(error))

323

raise AvahiGroupError("State changed: %s"

324

% unicode(error))

414

325

def cleanup(self):

415

326

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

416

327

if self.group is not None:

421

332

pass

422

333

self.group = None

423

334

self.remove()

424

425

335

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

426

336

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

427

337

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

}

338

bad_states = { avahi.SERVER_INVALID:

339

"Zeroconf server invalid",

340

avahi.SERVER_REGISTERING: None,

341

avahi.SERVER_COLLISION:

342

"Zeroconf server name collision",

343

avahi.SERVER_FAILURE:

344

"Zeroconf server failure" }

434

345

if state in bad_states:

435

346

if bad_states[state] is not None:

436

347

if error is None:

439

350

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

440

351

self.cleanup()

441

352

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)

353

self.add()

454

354

else:

455

355

if error is None:

456

356

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

457

357

else:

458

358

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

459

460

359

def activate(self):

461

360

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

462

361

if self.server is None:

466

365

follow_name_owner_changes=True),

467

366

avahi.DBUS_INTERFACE_SERVER)

468

367

self.server.connect_to_signal("StateChanged",

469

self.server_state_changed)

368

self.server_state_changed)

470

369

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

471

370

472

473

371

class AvahiServiceToSyslog(AvahiService):

474

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

372

def rename(self):

475

373

"""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)))

374

ret = AvahiService.rename(self)

375

syslogger.setFormatter(logging.Formatter

376

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

377

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

378

% self.name))

480

379

return ret

481

380

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

381

def timedelta_to_milliseconds(td):

382

"Convert a datetime.timedelta() to milliseconds"

383

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

384

+ (td.seconds * 1000)

385

+ (td.microseconds // 1000))

386

747

387

class Client(object):

748

388

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

749

389

754

394

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

755

395

to see if the client lives.

756

396

'None' if no process is running.

757

checker_callback_tag: a GLib event source tag, or None

397

checker_callback_tag: a gobject event source tag, or None

758

398

checker_command: string; External command which is run to check

759

399

if client lives. %() expansions are done at

760

400

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

761

401

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

762

checker_initiator_tag: a GLib event source tag, or None

402

checker_initiator_tag: a gobject event source tag, or None

763

403

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

764

404

client_structure: Object describing what attributes a client has

765

405

and is used for storing the client at exit

766

406

current_checker_command: string; current running checker_command

767

disable_initiator_tag: a GLib event source tag, or None

407

disable_initiator_tag: a gobject event source tag, or None

768

408

enabled: bool()

769

409

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

770

410

uniquely identify the client

774

414

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

775

415

last_checker_status: integer between 0 and 255 reflecting exit

776

416

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

417

checker, or None.

780

418

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

781

419

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

782

420

D-Bus identifiers

783

421

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

784

422

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

785

423

until this client is disabled

786

extended_timeout: extra long timeout when secret has been sent

424

extended_timeout: extra long timeout when password has been sent

787

425

runtime_expansions: Allowed attributes for runtime expansion.

788

426

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

789

427

disabled, or None

790

server_settings: The server_settings dict from main()

791

428

"""

792

429

793

430

runtime_expansions = ("approval_delay", "approval_duration",

794

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

795

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

796

"last_approval_request", "last_checked_ok",

431

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

432

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

797

433

"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

434

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

435

"extended_timeout": "15m",

436

"interval": "2m",

437

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

438

"host": "",

439

"approval_delay": "0s",

440

"approval_duration": "1s",

441

"approved_by_default": "True",

442

"enabled": "True",

443

}

444

445

def timeout_milliseconds(self):

446

"Return the 'timeout' attribute in milliseconds"

447

return timedelta_to_milliseconds(self.timeout)

448

449

def extended_timeout_milliseconds(self):

450

"Return the 'extended_timeout' attribute in milliseconds"

451

return timedelta_to_milliseconds(self.extended_timeout)

452

453

def interval_milliseconds(self):

454

"Return the 'interval' attribute in milliseconds"

455

return timedelta_to_milliseconds(self.interval)

456

457

def approval_delay_milliseconds(self):

458

return timedelta_to_milliseconds(self.approval_delay)

459

810

460

@staticmethod

811

461

def config_parser(config):

812

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

462

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

813

463

{ 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

"""

464

with exceptions for any special settings as defined above"""

818

465

settings = {}

819

466

for client_name in config.sections():

820

467

section = dict(config.items(client_name))

824

471

# Reformat values from string types to Python types

825

472

client["approved_by_default"] = config.getboolean(

826

473

client_name, "approved_by_default")

827

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

828

"enabled")

474

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

829

475

830

# Uppercase and remove spaces from fingerprint for later

831

# comparison purposes with return value from the

832

# fingerprint() function

833

476

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

834

477

.replace(" ", ""))

835

478

if "secret" in section:

836

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

837

.encode("utf-8"),

838

"base64")

479

client["secret"] = section["secret"].decode("base64")

839

480

elif "secfile" in section:

840

481

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

841

482

(section["secfile"])),

842

483

"rb") as secfile:

843

484

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

844

485

else:

845

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

846

.format(section))

486

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

487

% section)

847

488

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

848

489

client["extended_timeout"] = string_to_delta(

849

490

section["extended_timeout"])

855

496

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

856

497

client["last_approval_request"] = None

857

498

client["last_checked_ok"] = None

858

client["last_checker_status"] = -2

859

499

client["last_checker_status"] = None

500

if client["enabled"]:

501

client["last_enabled"] = datetime.datetime.utcnow()

502

client["expires"] = (datetime.datetime.utcnow()

503

+ client["timeout"])

504

else:

505

client["last_enabled"] = None

506

client["expires"] = None

507

860

508

return settings

861

862

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

509

510

511

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

512

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

513

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

514

attribute."""

863

515

self.name = name

864

if server_settings is None:

865

server_settings = {}

866

self.server_settings = server_settings

867

516

# adding all client settings

868

for setting, value in settings.items():

517

for setting, value in settings.iteritems():

869

518

setattr(self, setting, value)

870

519

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

881

520

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

521

# Uppercase and remove spaces from fingerprint for later

522

# comparison purposes with return value from the fingerprint()

523

# function

882

524

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

883

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

884

datetime.datetime.utcnow())

885

525

self.created = settings.get("created", datetime.datetime.utcnow())

526

886

527

# attributes specific for this server instance

887

528

self.checker = None

888

529

self.checker_initiator_tag = None

891

532

self.current_checker_command = None

892

533

self.approved = None

893

534

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()

535

self.changedstate = (multiprocessing_manager

536

.Condition(multiprocessing_manager

537

.Lock()))

538

self.client_structure = [attr for attr in

539

self.__dict__.iterkeys()

898

540

if not attr.startswith("_")]

899

541

self.client_structure.append("client_structure")

900

542

901

for name, t in inspect.getmembers(

902

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

543

for name, t in inspect.getmembers(type(self),

544

lambda obj:

545

isinstance(obj,

546

property)):

903

547

if not name.startswith("_"):

904

548

self.client_structure.append(name)

905

549

913

557

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

914

558

# Already enabled

915

559

return

560

self.send_changedstate()

916

561

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

917

562

self.enabled = True

918

563

self.last_enabled = datetime.datetime.utcnow()

919

564

self.init_checker()

920

self.send_changedstate()

921

565

922

566

def disable(self, quiet=True):

923

567

"""Disable this client."""

924

568

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

925

569

return False

926

570

if not quiet:

571

self.send_changedstate()

572

if not quiet:

927

573

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)

574

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

575

gobject.source_remove(self.disable_initiator_tag)

930

576

self.disable_initiator_tag = None

931

577

self.expires = None

932

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

933

GLib.source_remove(self.checker_initiator_tag)

578

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

579

gobject.source_remove(self.checker_initiator_tag)

934

580

self.checker_initiator_tag = None

935

581

self.stop_checker()

936

582

self.enabled = False

937

if not quiet:

938

self.send_changedstate()

939

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

583

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

940

584

return False

941

585

942

586

def __del__(self):

945

589

def init_checker(self):

946

590

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

947

591

# 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)

592

self.checker_initiator_tag = (gobject.timeout_add

593

(self.interval_milliseconds(),

594

self.start_checker))

953

595

# 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)

596

self.disable_initiator_tag = (gobject.timeout_add

597

(self.timeout_milliseconds(),

598

self.disable))

958

599

# Also start a new checker *right now*.

959

600

self.start_checker()

960

601

961

def checker_callback(self, source, condition, connection,

962

command):

602

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

963

603

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

964

604

self.checker_callback_tag = None

965

605

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

606

if os.WIFEXITED(condition):

607

self.last_checker_status = os.WEXITSTATUS(condition)

973

608

if self.last_checker_status == 0:

974

609

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

975

610

vars(self))

976

611

self.checked_ok()

977

612

else:

978

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

613

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

614

vars(self))

979

615

else:

980

616

self.last_checker_status = -1

981

self.last_checker_signal = -returncode

982

617

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

983

618

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."""

619

620

def checked_ok(self, timeout=None):

621

"""Bump up the timeout for this client.

622

623

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

624

alive and well.

625

"""

995

626

if timeout is None:

996

627

timeout = self.timeout

628

self.last_checked_ok = datetime.datetime.utcnow()

997

629

if self.disable_initiator_tag is not None:

998

GLib.source_remove(self.disable_initiator_tag)

999

self.disable_initiator_tag = None

630

gobject.source_remove(self.disable_initiator_tag)

1000

631

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

1001

self.disable_initiator_tag = GLib.timeout_add(

1002

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

632

self.disable_initiator_tag = (gobject.timeout_add

633

(timedelta_to_milliseconds

634

(timeout), self.disable))

1003

635

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

1004

636

1005

637

def need_approval(self):

1011

643

If a checker already exists, leave it running and do

1012

644

nothing."""

1013

645

# 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

646

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

647

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

648

# client would inevitably timeout, since no checker would get

649

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

1018

650

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

1019

651

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

1020

652

# should be.

1021

653

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

654

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

655

try:

656

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

657

except (AttributeError, OSError) as error:

658

if (isinstance(error, OSError)

659

and error.errno != errno.ECHILD):

660

raise error

661

else:

662

if pid:

663

logger.warning("Checker was a zombie")

664

gobject.source_remove(self.checker_callback_tag)

665

self.checker_callback(pid, status,

666

self.current_checker_command)

1026

667

# Start a new checker if needed

1027

668

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

669

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

670

# In case checker_command has exactly one % operator

671

command = self.checker_command % self.host

672

except TypeError:

673

# Escape attributes for the shell

674

escaped_attrs = dict(

675

(attr,

676

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

677

errors=

678

'replace')))

679

for attr in

680

self.runtime_expansions)

681

682

try:

683

command = self.checker_command % escaped_attrs

684

except TypeError as error:

685

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

686

' %s', self.checker_command, error)

687

return True # Try again later

1039

688

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

689

try:

690

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

691

command, self.name)

692

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

693

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

694

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

695

# always replaced by /dev/null.)

696

self.checker = subprocess.Popen(command,

697

close_fds=True,

698

shell=True, cwd="/")

699

self.checker_callback_tag = (gobject.child_watch_add

700

(self.checker.pid,

701

self.checker_callback,

702

data=command))

703

# The checker may have completed before the gobject

704

# watch was added. Check for this.

705

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

706

if pid:

707

gobject.source_remove(self.checker_callback_tag)

708

self.checker_callback(pid, status, command)

709

except OSError as error:

710

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

711

error)

712

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

1066

713

return True

1067

714

1068

715

def stop_checker(self):

1069

716

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

1070

717

if self.checker_callback_tag:

1071

GLib.source_remove(self.checker_callback_tag)

718

gobject.source_remove(self.checker_callback_tag)

1072

719

self.checker_callback_tag = None

1073

720

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

1074

721

return

1075

722

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

1076

self.checker.terminate()

723

try:

724

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

725

#time.sleep(0.5)

726

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

727

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

728

except OSError as error:

729

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

730

raise

1077

731

self.checker = None

1078

732

1079

733

1080

def dbus_service_property(dbus_interface,

1081

signature="v",

1082

access="readwrite",

1083

byte_arrays=False):

734

def dbus_service_property(dbus_interface, signature="v",

735

access="readwrite", byte_arrays=False):

1084

736

"""Decorators for marking methods of a DBusObjectWithProperties to

1085

737

become properties on the D-Bus.

1086

738

1095

747

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

1096

748

if byte_arrays and signature != "ay":

1097

749

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

1098

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

1099

750

" signature %r" % signature)

1100

751

def decorator(func):

1101

752

func._dbus_is_property = True

1102

753

func._dbus_interface = dbus_interface

1107

758

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

1108

759

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

1109

760

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

761

return decorator

1155

762

1156

763

1157

764

class DBusPropertyException(dbus.exceptions.DBusException):

1158

765

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

1159

766

"""

1160

pass

767

def __unicode__(self):

768

return unicode(str(self))

1161

769

1162

770

1163

771

class DBusPropertyAccessException(DBusPropertyException):

1172

780

pass

1173

781

1174

782

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):

783

class DBusObjectWithProperties(dbus.service.Object):

1265

784

"""A D-Bus object with properties.

1266

785

1267

786

Classes inheriting from this can use the dbus_service_property

1269

788

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

1270

789

"""

1271

790

791

@staticmethod

792

def _is_dbus_property(obj):

793

return getattr(obj, "_dbus_is_property", False)

794

795

def _get_all_dbus_properties(self):

796

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

797

"""

798

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

799

for cls in self.__class__.__mro__

800

for name, prop in

801

inspect.getmembers(cls, self._is_dbus_property))

802

1272

803

def _get_dbus_property(self, interface_name, property_name):

1273

804

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

1274

805

property with the specified name and interface.

1275

806

"""

1276

for cls in self.__class__.__mro__:

1277

for name, value in inspect.getmembers(

1278

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

807

for cls in self.__class__.__mro__:

808

for name, value in (inspect.getmembers

809

(cls, self._is_dbus_property)):

1279

810

if (value._dbus_name == property_name

1280

811

and value._dbus_interface == interface_name):

1281

812

return value.__get__(self)

1282

813

1283

814

# 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",

815

raise DBusPropertyNotFound(self.dbus_object_path + ":"

816

+ interface_name + "."

817

+ property_name)

818

819

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

1298

820

out_signature="v")

1299

821

def Get(self, interface_name, property_name):

1300

822

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

1318

840

# The byte_arrays option is not supported yet on

1319

841

# signatures other than "ay".

1320

842

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))

843

raise ValueError

844

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

845

for byte in value))

1326

846

prop(value)

1327

847

1328

@dbus.service.method(dbus.PROPERTIES_IFACE,

1329

in_signature="s",

848

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

1330

849

out_signature="a{sv}")

1331

850

def GetAll(self, interface_name):

1332

851

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

1335

854

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

1336

855

"""

1337

856

properties = {}

1338

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

857

for name, prop in self._get_all_dbus_properties():

1339

858

if (interface_name

1340

859

and interface_name != prop._dbus_interface):

1341

860

# Interface non-empty but did not match

1347

866

if not hasattr(value, "variant_level"):

1348

867

properties[name] = value

1349

868

continue

1350

properties[name] = type(value)(

1351

value, variant_level = value.variant_level + 1)

869

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

870

value.variant_level+1)

1352

871

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

1353

872

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

1361

1362

873

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1363

874

out_signature="s",

1364

875

path_keyword='object_path',

1365

876

connection_keyword='connection')

1366

877

def Introspect(self, object_path, connection):

1367

"""Overloading of standard D-Bus method.

1368

1369

Inserts property tags and interface annotation tags.

878

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

1370

879

"""

1371

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1372

object_path,

1373

connection)

880

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

881

connection)

1374

882

try:

1375

883

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

1376

1377

884

def make_tag(document, name, prop):

1378

885

e = document.createElement("property")

1379

886

e.setAttribute("name", name)

1380

887

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

1381

888

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

1382

889

return e

1383

1384

890

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

1385

# Add property tags

1386

891

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

1387

892

for name, prop

1388

in self._get_all_dbus_things("property")

893

in self._get_all_dbus_properties()

1389

894

if prop._dbus_interface

1390

895

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

1391

896

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

897

# Add the names to the return values for the

1409

898

# "org.freedesktop.DBus.Properties" methods

1410

899

if (if_tag.getAttribute("name")

1425

914

except (AttributeError, xml.dom.DOMException,

1426

915

xml.parsers.expat.ExpatError) as error:

1427

916

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):

917

error)

918

return xmlstring

919

920

921

def datetime_to_dbus (dt, variant_level=0):

1501

922

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

1502

923

if dt is None:

1503

924

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).

925

return dbus.String(dt.isoformat(),

926

variant_level=variant_level)

927

928

929

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

930

.__metaclass__):

931

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

932

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

1529

933

"""

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):

934

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

935

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

936

# methods, signals, or properties in them

937

for base in (b for b in bases

938

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

939

# Go though all attributes of the base class

940

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

1538

941

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

1539

942

# with the wrong interface name

1540

943

if (not hasattr(attribute, "_dbus_interface")

1541

or not attribute._dbus_interface.startswith(

1542

orig_interface_name)):

944

or not attribute._dbus_interface

945

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

1543

946

continue

1544

947

# Create an alternate D-Bus interface name based on

1545

948

# the current name

1546

alt_interface = attribute._dbus_interface.replace(

1547

orig_interface_name, alt_interface_name)

1548

interface_names.add(alt_interface)

949

alt_interface = (attribute._dbus_interface

950

.replace("se.recompile.Mandos",

951

"se.bsnet.fukt.Mandos"))

1549

952

# Is this a D-Bus signal?

1550

953

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(

954

# Extract the original non-method function by

955

# black magic

956

nonmethod_func = (dict(

1555

957

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)

958

attribute.__closure__))["func"]

959

.cell_contents)

1563

960

# Create a new, but exactly alike, function

1564

961

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

1565

962

# 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

963

new_function = (dbus.service.signal

964

(alt_interface,

965

attribute._dbus_signature)

966

(types.FunctionType(

967

nonmethod_func.func_code,

968

nonmethod_func.func_globals,

969

nonmethod_func.func_name,

970

nonmethod_func.func_defaults,

971

nonmethod_func.func_closure)))

1576

972

# 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

973

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

974

# signals gets sent when the function is called

1580

975

def fixscope(func1, func2):

1581

976

"""This function is a scope container to pass

1582

977

func1 and func2 to the "call_both" function

1583

978

outside of its arguments"""

1584

1585

@functools.wraps(func2)

1586

979

def call_both(*args, **kwargs):

1587

980

"""This function will emit two D-Bus

1588

981

signals by calling func1 and func2"""

1589

982

func1(*args, **kwargs)

1590

983

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

984

return call_both

1597

985

# Create the "call_both" function and add it to

1598

986

# the class

1599

attr[attrname] = fixscope(attribute, new_function)

987

attr[attrname] = fixscope(attribute,

988

new_function)

1600

989

# Is this a D-Bus method?

1601

990

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

1602

991

# Create a new, but exactly alike, function

1603

992

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

1604

993

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

1605

994

# 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

995

attr[attrname] = (dbus.service.method

996

(alt_interface,

997

attribute._dbus_in_signature,

998

attribute._dbus_out_signature)

999

(types.FunctionType

1000

(attribute.func_code,

1001

attribute.func_globals,

1002

attribute.func_name,

1003

attribute.func_defaults,

1004

attribute.func_closure)))

1618

1005

# Is this a D-Bus property?

1619

1006

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

1620

1007

# Create a new, but exactly alike, function

1621

1008

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

1622

1009

# property with the alternate D-Bus interface

1623

1010

# 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"})

1011

attr[attrname] = (dbus_service_property

1012

(alt_interface,

1013

attribute._dbus_signature,

1014

attribute._dbus_access,

1015

attribute

1016

._dbus_get_args_options

1017

["byte_arrays"])

1018

(types.FunctionType

1019

(attribute.func_code,

1020

attribute.func_globals,

1021

attribute.func_name,

1022

attribute.func_defaults,

1023

attribute.func_closure)))

1024

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

1025

1026

1676

1027

class ClientDBus(Client, DBusObjectWithProperties):

1677

1028

"""A Client class using D-Bus

1678

1029

1682

1033

"""

1683

1034

1684

1035

runtime_expansions = (Client.runtime_expansions

1685

+ ("dbus_object_path", ))

1686

1687

_interface = "se.recompile.Mandos.Client"

1036

+ ("dbus_object_path",))

1688

1037

1689

1038

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

1690

1039

1691

1040

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

1692

1041

self.bus = bus

1693

1042

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

1043

self._approvals_pending = 0

1044

1045

self._approvals_pending = 0

1694

1046

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

1695

1047

# the D-Bus

1696

client_object_name = str(self.name).translate(

1048

client_object_name = unicode(self.name).translate(

1697

1049

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

1698

1050

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

1699

self.dbus_object_path = dbus.ObjectPath(

1700

"/clients/" + client_object_name)

1051

self.dbus_object_path = (dbus.ObjectPath

1052

("/clients/" + client_object_name))

1701

1053

DBusObjectWithProperties.__init__(self, self.bus,

1702

1054

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):

1055

1056

def notifychangeproperty(transform_func,

1057

dbus_name, type_func=lambda x: x,

1058

variant_level=1):

1709

1059

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

1710

1060

its changes to DBus.

1711

1061

1716

1066

to the D-Bus. Default: no transform

1717

1067

variant_level: D-Bus variant level. Default: 1

1718

1068

"""

1719

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

1720

1069

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

1721

1070

def setter(self, value):

1722

1071

if hasattr(self, "dbus_object_path"):

1723

1072

if (not hasattr(self, attrname) or

1724

1073

type_func(getattr(self, attrname, None))

1725

1074

!= 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())

1075

dbus_value = transform_func(type_func(value),

1076

variant_level

1077

=variant_level)

1078

self.PropertyChanged(dbus.String(dbus_name),

1079

dbus_value)

1741

1080

setattr(self, attrname, value)

1742

1081

1743

1082

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

1744

1083

1084

1745

1085

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1746

1086

approvals_pending = notifychangeproperty(dbus.Boolean,

1747

1087

"ApprovalPending",

1749

1089

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

1750

1090

last_enabled = notifychangeproperty(datetime_to_dbus,

1751

1091

"LastEnabled")

1752

checker = notifychangeproperty(

1753

dbus.Boolean, "CheckerRunning",

1754

type_func = lambda checker: checker is not None)

1092

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

1093

type_func = lambda checker:

1094

checker is not None)

1755

1095

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1756

1096

"LastCheckedOK")

1757

last_checker_status = notifychangeproperty(dbus.Int16,

1758

"LastCheckerStatus")

1759

1097

last_approval_request = notifychangeproperty(

1760

1098

datetime_to_dbus, "LastApprovalRequest")

1761

1099

approved_by_default = notifychangeproperty(dbus.Boolean,

1762

1100

"ApprovedByDefault")

1763

approval_delay = notifychangeproperty(

1764

dbus.UInt64, "ApprovalDelay",

1765

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

1101

approval_delay = notifychangeproperty(dbus.UInt64,

1102

"ApprovalDelay",

1103

type_func =

1104

timedelta_to_milliseconds)

1766

1105

approval_duration = notifychangeproperty(

1767

1106

dbus.UInt64, "ApprovalDuration",

1768

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

1107

type_func = timedelta_to_milliseconds)

1769

1108

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

1770

timeout = notifychangeproperty(

1771

dbus.UInt64, "Timeout",

1772

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

1109

timeout = notifychangeproperty(dbus.UInt64, "Timeout",

1110

type_func =

1111

timedelta_to_milliseconds)

1773

1112

extended_timeout = notifychangeproperty(

1774

1113

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)

1114

type_func = timedelta_to_milliseconds)

1115

interval = notifychangeproperty(dbus.UInt64,

1116

"Interval",

1117

type_func =

1118

timedelta_to_milliseconds)

1779

1119

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

1780

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

1781

invalidate_only=True)

1782

1120

1783

1121

del notifychangeproperty

1784

1122

1791

1129

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

1792

1130

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

1793

1131

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:

1132

def checker_callback(self, pid, condition, command,

1133

*args, **kwargs):

1134

self.checker_callback_tag = None

1135

self.checker = None

1136

if os.WIFEXITED(condition):

1137

exitstatus = os.WEXITSTATUS(condition)

1801

1138

# Emit D-Bus signal

1802

1139

self.CheckerCompleted(dbus.Int16(exitstatus),

1803

# This is specific to GNU libC

1804

dbus.Int64(exitstatus << 8),

1140

dbus.Int64(condition),

1805

1141

dbus.String(command))

1806

1142

else:

1807

1143

# Emit D-Bus signal

1808

1144

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

1809

dbus.Int64(

1810

# This is specific to GNU libC

1811

(exitstatus << 8)

1812

| self.last_checker_signal),

1145

dbus.Int64(condition),

1813

1146

dbus.String(command))

1814

return ret

1147

1148

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

1149

*args, **kwargs)

1815

1150

1816

1151

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

1817

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

1152

old_checker = self.checker

1153

if self.checker is not None:

1154

old_checker_pid = self.checker.pid

1155

else:

1156

old_checker_pid = None

1818

1157

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

1819

1158

# Only if new checker process was started

1820

1159

if (self.checker is not None

1828

1167

return False

1829

1168

1830

1169

def approve(self, value=True):

1170

self.send_changedstate()

1831

1171

self.approved = value

1832

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

1833

* 1000), self._reset_approved)

1834

self.send_changedstate()

1172

gobject.timeout_add(timedelta_to_milliseconds

1173

(self.approval_duration),

1174

self._reset_approved)

1175

1835

1176

1836

1177

## D-Bus methods, signals & properties

1837

1838

## Interfaces

1178

_interface = "se.recompile.Mandos.Client"

1839

1179

1840

1180

## Signals

1841

1181

1852

1192

pass

1853

1193

1854

1194

# PropertyChanged - signal

1855

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

1856

1195

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

1857

1196

def PropertyChanged(self, property, value):

1858

1197

"D-Bus signal"

1879

1218

"D-Bus signal"

1880

1219

return self.need_approval()

1881

1220

1221

# NeRwequest - signal

1222

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

1223

def NewRequest(self, ip):

1224

"""D-Bus signal

1225

Is sent after a client request a password.

1226

"""

1227

pass

1228

1882

1229

## Methods

1883

1230

1884

1231

# Approve - method

1892

1239

self.checked_ok()

1893

1240

1894

1241

# Enable - method

1895

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

1896

1242

@dbus.service.method(_interface)

1897

1243

def Enable(self):

1898

1244

"D-Bus method"

1899

1245

self.enable()

1900

1246

1901

1247

# StartChecker - method

1902

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

1903

1248

@dbus.service.method(_interface)

1904

1249

def StartChecker(self):

1905

1250

"D-Bus method"

1906

1251

self.start_checker()

1907

1252

1908

1253

# Disable - method

1909

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

1910

1254

@dbus.service.method(_interface)

1911

1255

def Disable(self):

1912

1256

"D-Bus method"

1913

1257

self.disable()

1914

1258

1915

1259

# StopChecker - method

1916

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

1917

1260

@dbus.service.method(_interface)

1918

1261

def StopChecker(self):

1919

1262

self.stop_checker()

1926

1269

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

1927

1270

1928

1271

# ApprovedByDefault - property

1929

@dbus_service_property(_interface,

1930

signature="b",

1272

@dbus_service_property(_interface, signature="b",

1931

1273

access="readwrite")

1932

1274

def ApprovedByDefault_dbus_property(self, value=None):

1933

1275

if value is None: # get

1935

1277

self.approved_by_default = bool(value)

1936

1278

1937

1279

# ApprovalDelay - property

1938

@dbus_service_property(_interface,

1939

signature="t",

1280

@dbus_service_property(_interface, signature="t",

1940

1281

access="readwrite")

1941

1282

def ApprovalDelay_dbus_property(self, value=None):

1942

1283

if value is None: # get

1943

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

1944

* 1000)

1284

return dbus.UInt64(self.approval_delay_milliseconds())

1945

1285

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

1946

1286

1947

1287

# ApprovalDuration - property

1948

@dbus_service_property(_interface,

1949

signature="t",

1288

@dbus_service_property(_interface, signature="t",

1950

1289

access="readwrite")

1951

1290

def ApprovalDuration_dbus_property(self, value=None):

1952

1291

if value is None: # get

1953

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

1954

* 1000)

1292

return dbus.UInt64(timedelta_to_milliseconds(

1293

self.approval_duration))

1955

1294

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

1956

1295

1957

1296

# Name - property

1958

@dbus_annotations(

1959

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

1960

1297

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

1961

1298

def Name_dbus_property(self):

1962

1299

return dbus.String(self.name)

1963

1300

1964

1301

# Fingerprint - property

1965

@dbus_annotations(

1966

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

1967

1302

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

1968

1303

def Fingerprint_dbus_property(self):

1969

1304

return dbus.String(self.fingerprint)

1970

1305

1971

1306

# Host - property

1972

@dbus_service_property(_interface,

1973

signature="s",

1307

@dbus_service_property(_interface, signature="s",

1974

1308

access="readwrite")

1975

1309

def Host_dbus_property(self, value=None):

1976

1310

if value is None: # get

1977

1311

return dbus.String(self.host)

1978

self.host = str(value)

1312

self.host = unicode(value)

1979

1313

1980

1314

# Created - property

1981

@dbus_annotations(

1982

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

1983

1315

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

1984

1316

def Created_dbus_property(self):

1985

1317

return datetime_to_dbus(self.created)

1990

1322

return datetime_to_dbus(self.last_enabled)

1991

1323

1992

1324

# Enabled - property

1993

@dbus_service_property(_interface,

1994

signature="b",

1325

@dbus_service_property(_interface, signature="b",

1995

1326

access="readwrite")

1996

1327

def Enabled_dbus_property(self, value=None):

1997

1328

if value is None: # get

2002

1333

self.disable()

2003

1334

2004

1335

# LastCheckedOK - property

2005

@dbus_service_property(_interface,

2006

signature="s",

1336

@dbus_service_property(_interface, signature="s",

2007

1337

access="readwrite")

2008

1338

def LastCheckedOK_dbus_property(self, value=None):

2009

1339

if value is not None:

2011

1341

return

2012

1342

return datetime_to_dbus(self.last_checked_ok)

2013

1343

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

1344

# Expires - property

2020

1345

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

2021

1346

def Expires_dbus_property(self):

2027

1352

return datetime_to_dbus(self.last_approval_request)

2028

1353

2029

1354

# Timeout - property

2030

@dbus_service_property(_interface,

2031

signature="t",

1355

@dbus_service_property(_interface, signature="t",

2032

1356

access="readwrite")

2033

1357

def Timeout_dbus_property(self, value=None):

2034

1358

if value is None: # get

2035

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

2036

old_timeout = self.timeout

1359

return dbus.UInt64(self.timeout_milliseconds())

2037

1360

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)

1361

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

1362

return

1363

# Reschedule timeout

1364

gobject.source_remove(self.disable_initiator_tag)

1365

self.disable_initiator_tag = None

1366

self.expires = None

1367

time_to_die = timedelta_to_milliseconds((self

1368

.last_checked_ok

1369

+ self.timeout)

1370

- datetime.datetime

1371

.utcnow())

1372

if time_to_die <= 0:

1373

# The timeout has passed

1374

self.disable()

1375

else:

1376

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

1377

+ datetime.timedelta(milliseconds =

1378

time_to_die))

1379

self.disable_initiator_tag = (gobject.timeout_add

1380

(time_to_die, self.disable))

2053

1381

2054

1382

# ExtendedTimeout - property

2055

@dbus_service_property(_interface,

2056

signature="t",

1383

@dbus_service_property(_interface, signature="t",

2057

1384

access="readwrite")

2058

1385

def ExtendedTimeout_dbus_property(self, value=None):

2059

1386

if value is None: # get

2060

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

2061

* 1000)

1387

return dbus.UInt64(self.extended_timeout_milliseconds())

2062

1388

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

2063

1389

2064

1390

# Interval - property

2065

@dbus_service_property(_interface,

2066

signature="t",

1391

@dbus_service_property(_interface, signature="t",

2067

1392

access="readwrite")

2068

1393

def Interval_dbus_property(self, value=None):

2069

1394

if value is None: # get

2070

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

1395

return dbus.UInt64(self.interval_milliseconds())

2071

1396

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

2072

1397

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

2073

1398

return

2074

1399

if self.enabled:

2075

1400

# 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

1401

gobject.source_remove(self.checker_initiator_tag)

1402

self.checker_initiator_tag = (gobject.timeout_add

1403

(value, self.start_checker))

1404

self.start_checker() # Start one now, too

2080

1405

2081

1406

# Checker - property

2082

@dbus_service_property(_interface,

2083

signature="s",

1407

@dbus_service_property(_interface, signature="s",

2084

1408

access="readwrite")

2085

1409

def Checker_dbus_property(self, value=None):

2086

1410

if value is None: # get

2087

1411

return dbus.String(self.checker_command)

2088

self.checker_command = str(value)

1412

self.checker_command = unicode(value)

2089

1413

2090

1414

# CheckerRunning - property

2091

@dbus_service_property(_interface,

2092

signature="b",

1415

@dbus_service_property(_interface, signature="b",

2093

1416

access="readwrite")

2094

1417

def CheckerRunning_dbus_property(self, value=None):

2095

1418

if value is None: # get

2100

1423

self.stop_checker()

2101

1424

2102

1425

# ObjectPath - property

2103

@dbus_annotations(

2104

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

2105

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

2106

1426

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

2107

1427

def ObjectPath_dbus_property(self):

2108

1428

return self.dbus_object_path # is already a dbus.ObjectPath

2109

1429

2110

1430

# 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)

1431

@dbus_service_property(_interface, signature="ay",

1432

access="write", byte_arrays=True)

2118

1433

def Secret_dbus_property(self, value):

2119

self.secret = bytes(value)

1434

self.secret = str(value)

2120

1435

2121

1436

del _interface

2122

1437

2126

1441

self._pipe = child_pipe

2127

1442

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

2128

1443

if not self._pipe.recv():

2129

raise KeyError(fpr)

1444

raise KeyError()

2130

1445

2131

1446

def __getattribute__(self, name):

2132

1447

if name == '_pipe':

2136

1451

if data[0] == 'data':

2137

1452

return data[1]

2138

1453

if data[0] == 'function':

2139

2140

1454

def func(*args, **kwargs):

2141

1455

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

2142

1456

return self._pipe.recv()[1]

2143

2144

1457

return func

2145

1458

2146

1459

def __setattr__(self, name, value):

2149

1462

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

2150

1463

2151

1464

1465

class ClientDBusTransitional(ClientDBus):

1466

__metaclass__ = AlternateDBusNamesMetaclass

1467

1468

2152

1469

class ClientHandler(socketserver.BaseRequestHandler, object):

2153

1470

"""A class to handle client connections.

2154

1471

2158

1475

def handle(self):

2159

1476

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

2160

1477

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

2161

str(self.client_address))

1478

unicode(self.client_address))

2162

1479

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

2163

1480

self.server.child_pipe.fileno())

2164

1481

2165

session = gnutls.ClientSession(self.request)

1482

session = (gnutls.connection

1483

.ClientSession(self.request,

1484

gnutls.connection

1485

.X509Credentials()))

1486

1487

# Note: gnutls.connection.X509Credentials is really a

1488

# generic GnuTLS certificate credentials object so long as

1489

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

1490

# here despite using OpenPGP certificates.

2166

1491

2167

1492

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

2168

1493

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

2172

1497

priority = self.server.gnutls_priority

2173

1498

if priority is None:

2174

1499

priority = "NORMAL"

2175

gnutls.priority_set_direct(session._c_object, priority,

2176

None)

1500

(gnutls.library.functions

1501

.gnutls_priority_set_direct(session._c_object,

1502

priority, None))

2177

1503

2178

1504

# Start communication using the Mandos protocol

2179

1505

# Get protocol number

2181

1507

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

2182

1508

try:

2183

1509

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

2184

raise RuntimeError(line)

1510

raise RuntimeError

2185

1511

except (ValueError, IndexError, RuntimeError) as error:

2186

1512

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

2187

1513

return

2189

1515

# Start GnuTLS connection

2190

1516

try:

2191

1517

session.handshake()

2192

except gnutls.Error as error:

1518

except gnutls.errors.GNUTLSError as error:

2193

1519

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

2194

1520

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

2195

1521

# established. Just abandon the request.

2199

1525

approval_required = False

2200

1526

try:

2201

1527

try:

2202

fpr = self.fingerprint(

2203

self.peer_certificate(session))

2204

except (TypeError, gnutls.Error) as error:

1528

fpr = self.fingerprint(self.peer_certificate

1529

(session))

1530

except (TypeError,

1531

gnutls.errors.GNUTLSError) as error:

2205

1532

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

2206

1533

return

2207

1534

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

2212

1539

except KeyError:

2213

1540

return

2214

1541

1542

if self.server.use_dbus:

1543

# Emit D-Bus signal

1544

client.NewRequest(str(self.client_address))

1545

2215

1546

if client.approval_delay:

2216

1547

delay = client.approval_delay

2217

1548

client.approvals_pending += 1

2220

1551

while True:

2221

1552

if not client.enabled:

2222

1553

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

2223

client.name)

1554

client.name)

2224

1555

if self.server.use_dbus:

2225

1556

# Emit D-Bus signal

2226

1557

client.Rejected("Disabled")

2235

1566

if self.server.use_dbus:

2236

1567

# Emit D-Bus signal

2237

1568

client.NeedApproval(

2238

client.approval_delay.total_seconds()

2239

* 1000, client.approved_by_default)

1569

client.approval_delay_milliseconds(),

1570

client.approved_by_default)

2240

1571

else:

2241

1572

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

2242

1573

client.name)

2248

1579

#wait until timeout or approved

2249

1580

time = datetime.datetime.now()

2250

1581

client.changedstate.acquire()

2251

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

1582

(client.changedstate.wait

1583

(float(client.timedelta_to_milliseconds(delay)

1584

/ 1000)))

2252

1585

client.changedstate.release()

2253

1586

time2 = datetime.datetime.now()

2254

1587

if (time2 - time) >= delay:

2265

1598

else:

2266

1599

delay -= time2 - time

2267

1600

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

1601

sent_size = 0

1602

while sent_size < len(client.secret):

1603

try:

1604

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

1605

except gnutls.errors.GNUTLSError as error:

1606

logger.warning("gnutls send failed")

1607

return

1608

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

1609

sent, len(client.secret)

1610

- (sent_size + sent))

1611

sent_size += sent

2274

1612

2275

1613

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

2276

1614

# bump the timeout using extended_timeout

2277

client.bump_timeout(client.extended_timeout)

1615

client.checked_ok(client.extended_timeout)

2278

1616

if self.server.use_dbus:

2279

1617

# Emit D-Bus signal

2280

1618

client.GotSecret()

2284

1622

client.approvals_pending -= 1

2285

1623

try:

2286

1624

session.bye()

2287

except gnutls.Error as error:

2288

logger.warning("GnuTLS bye failed",

2289

exc_info=error)

1625

except gnutls.errors.GNUTLSError as error:

1626

logger.warning("GnuTLS bye failed")

2290

1627

2291

1628

@staticmethod

2292

1629

def peer_certificate(session):

2293

1630

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

2294

1631

# 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""

1632

if (gnutls.library.functions

1633

.gnutls_certificate_type_get(session._c_object)

1634

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

1635

# ...do the normal thing

1636

return session.peer_certificate

2299

1637

list_size = ctypes.c_uint(1)

2300

cert_list = (gnutls.certificate_get_peers

1638

cert_list = (gnutls.library.functions

1639

.gnutls_certificate_get_peers

2301

1640

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

2302

1641

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

2303

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

1642

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

1643

" certificate")

2304

1644

if list_size.value == 0:

2305

1645

return None

2306

1646

cert = cert_list[0]

2310

1650

def fingerprint(openpgp):

2311

1651

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

2312

1652

# 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)))

1653

datum = (gnutls.library.types

1654

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

1655

ctypes.POINTER

1656

(ctypes.c_ubyte)),

1657

ctypes.c_uint(len(openpgp))))

2317

1658

# New empty GnuTLS certificate

2318

crt = gnutls.openpgp_crt_t()

2319

gnutls.openpgp_crt_init(ctypes.byref(crt))

1659

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1660

(gnutls.library.functions

1661

.gnutls_openpgp_crt_init(ctypes.byref(crt)))

2320

1662

# Import the OpenPGP public key into the certificate

2321

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

2322

gnutls.OPENPGP_FMT_RAW)

1663

(gnutls.library.functions

1664

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

1665

gnutls.library.constants

1666

.GNUTLS_OPENPGP_FMT_RAW))

2323

1667

# Verify the self signature in the key

2324

1668

crtverify = ctypes.c_uint()

2325

gnutls.openpgp_crt_verify_self(crt, 0,

2326

ctypes.byref(crtverify))

1669

(gnutls.library.functions

1670

.gnutls_openpgp_crt_verify_self(crt, 0,

1671

ctypes.byref(crtverify)))

2327

1672

if crtverify.value != 0:

2328

gnutls.openpgp_crt_deinit(crt)

2329

raise gnutls.CertificateSecurityError("Verify failed")

1673

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1674

raise (gnutls.errors.CertificateSecurityError

1675

("Verify failed"))

2330

1676

# New buffer for the fingerprint

2331

1677

buf = ctypes.create_string_buffer(20)

2332

1678

buf_len = ctypes.c_size_t()

2333

1679

# Get the fingerprint from the certificate into the buffer

2334

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

2335

ctypes.byref(buf_len))

1680

(gnutls.library.functions

1681

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

1682

ctypes.byref(buf_len)))

2336

1683

# Deinit the certificate

2337

gnutls.openpgp_crt_deinit(crt)

1684

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2338

1685

# Convert the buffer to a Python bytestring

2339

1686

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

2340

1687

# Convert the bytestring to hexadecimal notation

2344

1691

2345

1692

class MultiprocessingMixIn(object):

2346

1693

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

2347

2348

1694

def sub_process_main(self, request, address):

2349

1695

try:

2350

1696

self.finish_request(request, address)

2355

1701

def process_request(self, request, address):

2356

1702

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

2357

1703

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

2358

args = (request, address))

1704

args = (request,

1705

address))

2359

1706

proc.start()

2360

1707

return proc

2361

1708

2362

1709

2363

1710

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

2364

1711

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

2365

2366

1712

def process_request(self, request, client_address):

2367

1713

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

2368

1714

2377

1723

2378

1724

def add_pipe(self, parent_pipe, proc):

2379

1725

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

2380

raise NotImplementedError()

1726

raise NotImplementedError

2381

1727

2382

1728

2383

1729

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

2389

1735

interface: None or a network interface name (string)

2390

1736

use_ipv6: Boolean; to use IPv6 or not

2391

1737

"""

2392

2393

1738

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

"""

1739

interface=None, use_ipv6=True):

2400

1740

self.interface = interface

2401

1741

if use_ipv6:

2402

1742

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

1743

socketserver.TCPServer.__init__(self, server_address,

2430

1744

RequestHandlerClass)

2431

2432

1745

def server_bind(self):

2433

1746

"""This overrides the normal server_bind() function

2434

1747

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

2440

1753

self.interface)

2441

1754

else:

2442

1755

try:

2443

self.socket.setsockopt(

2444

socket.SOL_SOCKET, SO_BINDTODEVICE,

2445

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

1756

self.socket.setsockopt(socket.SOL_SOCKET,

1757

SO_BINDTODEVICE,

1758

str(self.interface

1759

+ '\0'))

2446

1760

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:

1761

if error[0] == errno.EPERM:

1762

logger.error("No permission to"

1763

" bind to interface %s",

1764

self.interface)

1765

elif error[0] == errno.ENOPROTOOPT:

2451

1766

logger.error("SO_BINDTODEVICE not available;"

2452

1767

" cannot bind to interface %s",

2453

1768

self.interface)

2454

elif error.errno == errno.ENODEV:

2455

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

2456

" cannot bind", self.interface)

2457

1769

else:

2458

1770

raise

2459

1771

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

2462

1774

if self.address_family == socket.AF_INET6:

2463

1775

any_address = "::" # in6addr_any

2464

1776

else:

2465

any_address = "0.0.0.0" # INADDR_ANY

1777

any_address = socket.INADDR_ANY

2466

1778

self.server_address = (any_address,

2467

1779

self.server_address[1])

2468

1780

elif not self.server_address[1]:

2469

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

1781

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

1782

0)

2470

1783

# if self.interface:

2471

1784

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

2472

1785

# 0, # port

2484

1797

gnutls_priority GnuTLS priority string

2485

1798

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

2486

1799

2487

Assumes a GLib.MainLoop event loop.

1800

Assumes a gobject.MainLoop event loop.

2488

1801

"""

2489

2490

1802

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):

1803

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

1804

gnutls_priority=None, use_dbus=True):

2497

1805

self.enabled = False

2498

1806

self.clients = clients

2499

1807

if self.clients is None:

2503

1811

IPv6_TCPServer.__init__(self, server_address,

2504

1812

RequestHandlerClass,

2505

1813

interface = interface,

2506

use_ipv6 = use_ipv6,

2507

socketfd = socketfd)

2508

1814

use_ipv6 = use_ipv6)

2509

1815

def server_activate(self):

2510

1816

if self.enabled:

2511

1817

return socketserver.TCPServer.server_activate(self)

2515

1821

2516

1822

def add_pipe(self, parent_pipe, proc):

2517

1823

# 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))

1824

gobject.io_add_watch(parent_pipe.fileno(),

1825

gobject.IO_IN | gobject.IO_HUP,

1826

functools.partial(self.handle_ipc,

1827

parent_pipe =

1828

parent_pipe,

1829

proc = proc))

2524

1830

2525

def handle_ipc(self, source, condition,

2526

parent_pipe=None,

2527

proc = None,

2528

client_object=None):

1831

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

1832

proc = None, client_object=None):

1833

condition_names = {

1834

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

1835

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

1836

# blocking).

1837

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

1838

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

1839

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

1840

# broken, usually for pipes and

1841

# sockets).

1842

}

1843

conditions_string = ' | '.join(name

1844

for cond, name in

1845

condition_names.iteritems()

1846

if cond & condition)

2529

1847

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

2530

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

1848

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

2531

1849

# Wait for other process to exit

2532

1850

proc.join()

2533

1851

return False

2540

1858

fpr = request[1]

2541

1859

address = request[2]

2542

1860

2543

for c in self.clients.values():

1861

for c in self.clients.itervalues():

2544

1862

if c.fingerprint == fpr:

2545

1863

client = c

2546

1864

break

2554

1872

parent_pipe.send(False)

2555

1873

return False

2556

1874

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))

1875

gobject.io_add_watch(parent_pipe.fileno(),

1876

gobject.IO_IN | gobject.IO_HUP,

1877

functools.partial(self.handle_ipc,

1878

parent_pipe =

1879

parent_pipe,

1880

proc = proc,

1881

client_object =

1882

client))

2564

1883

parent_pipe.send(True)

2565

1884

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

2566

1885

# same fileno

2572

1891

2573

1892

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

2574

1893

funcname)(*args,

2575

**kwargs)))

1894

**kwargs)))

2576

1895

2577

1896

if command == 'getattr':

2578

1897

attrname = request[1]

2579

if isinstance(client_object.__getattribute__(attrname),

2580

collections.Callable):

2581

parent_pipe.send(('function', ))

1898

if callable(client_object.__getattribute__(attrname)):

1899

parent_pipe.send(('function',))

2582

1900

else:

2583

parent_pipe.send((

2584

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

1901

parent_pipe.send(('data', client_object

1902

.__getattribute__(attrname)))

2585

1903

2586

1904

if command == 'setattr':

2587

1905

attrname = request[1]

2591

1909

return True

2592

1910

2593

1911

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

1912

def string_to_delta(interval):

2691

1913

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

2692

1914

2703

1925

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

2704

1926

datetime.timedelta(0, 330)

2705

1927

"""

2706

2707

try:

2708

return rfc3339_duration_to_delta(interval)

2709

except ValueError:

2710

pass

2711

2712

1928

timevalue = datetime.timedelta(0)

2713

1929

for s in interval.split():

2714

1930

try:

2715

suffix = s[-1]

1931

suffix = unicode(s[-1])

2716

1932

value = int(s[:-1])

2717

1933

if suffix == "d":

2718

1934

delta = datetime.timedelta(value)

2725

1941

elif suffix == "w":

2726

1942

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

2727

1943

else:

2728

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

2729

except IndexError as e:

1944

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

1945

except (ValueError, IndexError) as e:

2730

1946

raise ValueError(*(e.args))

2731

1947

timevalue += delta

2732

1948

return timevalue

2745

1961

sys.exit()

2746

1962

if not noclose:

2747

1963

# Close all standard open file descriptors

2748

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

1964

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

2749

1965

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

2750

1966

raise OSError(errno.ENODEV,

2751

"{} not a character device"

2752

.format(os.devnull))

1967

"%s not a character device"

1968

% os.path.devnull)

2753

1969

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

2754

1970

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

2755

1971

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

2764

1980

2765

1981

parser = argparse.ArgumentParser()

2766

1982

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

2767

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

1983

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

2768

1984

help="show version number and exit")

2769

1985

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

2770

1986

help="Bind to interface IF")

2776

1992

help="Run self-test")

2777

1993

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

2778

1994

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

2779

" to terminal", default=None)

1995

" to terminal")

2780

1996

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

2781

1997

help="Debug level for stdout output")

2782

1998

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

2789

2005

" files")

2790

2006

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

2791

2007

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

2792

" system bus interface", default=None)

2008

" system bus interface")

2793

2009

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

2794

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

2795

default=None)

2010

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

2796

2011

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

2797

2012

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")

2013

" state")

2802

2014

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

2803

2015

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

2016

2810

2017

options = parser.parse_args()

2811

2018

2812

2019

if options.check:

2813

2020

import doctest

2814

fail_count, test_count = doctest.testmod()

2815

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

2021

doctest.testmod()

2022

sys.exit()

2816

2023

2817

2024

# Default values for config file for server-global settings

2818

2025

server_defaults = { "interface": "",

2820

2027

"port": "",

2821

2028

"debug": "False",

2822

2029

"priority":

2823

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

2824

":+SIGN-DSA-SHA256",

2030

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

2825

2031

"servicename": "Mandos",

2826

2032

"use_dbus": "True",

2827

2033

"use_ipv6": "True",

2828

2034

"debuglevel": "",

2829

2035

"restore": "True",

2830

"socket": "",

2831

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

2832

"foreground": "False",

2833

"zeroconf": "True",

2834

}

2036

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

2037

}

2835

2038

2836

2039

# Parse config file for server-global settings

2837

2040

server_config = configparser.SafeConfigParser(server_defaults)

2838

2041

del server_defaults

2839

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

2042

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

2043

"mandos.conf"))

2840

2044

# Convert the SafeConfigParser object to a dict

2841

2045

server_settings = server_config.defaults()

2842

2046

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

2843

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

2047

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

2844

2048

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

2845

2049

option)

2846

2050

if server_settings["port"]:

2847

2051

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

2848

2052

"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

2053

del server_config

2859

2054

2860

2055

# Override the settings from the config file with command line

2861

2056

# options, if set.

2862

2057

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

2863

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

2864

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

2865

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

2058

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

2059

"use_dbus", "use_ipv6", "debuglevel", "restore",

2060

"statedir"):

2866

2061

value = getattr(options, option)

2867

2062

if value is not None:

2868

2063

server_settings[option] = value

2869

2064

del options

2870

2065

# Force all strings to be unicode

2871

2066

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

2067

if type(server_settings[option]) is str:

2068

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

2882

2069

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

2883

2070

2884

2071

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

2885

2072

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

2073

# For convenience

2892

2074

debug = server_settings["debug"]

2893

2075

debuglevel = server_settings["debuglevel"]

2895

2077

use_ipv6 = server_settings["use_ipv6"]

2896

2078

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

2897

2079

stored_state_file)

2898

foreground = server_settings["foreground"]

2899

zeroconf = server_settings["zeroconf"]

2900

2080

2901

2081

if debug:

2902

2082

initlogger(debug, logging.DEBUG)

2908

2088

initlogger(debug, level)

2909

2089

2910

2090

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

2911

syslogger.setFormatter(

2912

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

2913

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

2914

server_settings["servicename"])))

2091

syslogger.setFormatter(logging.Formatter

2092

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

2093

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

2094

% server_settings["servicename"]))

2915

2095

2916

2096

# Parse config file with clients

2917

client_config = configparser.SafeConfigParser(Client

2918

.client_defaults)

2097

client_config = configparser.SafeConfigParser(Client.client_defaults)

2919

2098

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

2920

2099

"clients.conf"))

2921

2100

2922

2101

global mandos_dbus_service

2923

2102

mandos_dbus_service = None

2924

2103

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

2104

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

2105

server_settings["port"]),

2106

ClientHandler,

2107

interface=(server_settings["interface"]

2108

or None),

2109

use_ipv6=use_ipv6,

2110

gnutls_priority=

2111

server_settings["priority"],

2112

use_dbus=use_dbus)

2113

if not debug:

2114

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

2941

2115

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)

2116

pidfile = open(pidfilename, "w")

2117

except IOError:

2118

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

2946

2119

2947

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

2948

("mandos", "mandos"),

2949

("nobody", "nogroup")):

2120

try:

2121

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

2122

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

2123

except KeyError:

2950

2124

try:

2951

uid = pwd.getpwnam(name).pw_uid

2952

gid = pwd.getpwnam(group).pw_gid

2953

break

2125

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

2126

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

2954

2127

except KeyError:

2955

continue

2956

else:

2957

uid = 65534

2958

gid = 65534

2128

try:

2129

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

2130

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

2131

except KeyError:

2132

uid = 65534

2133

gid = 65534

2959

2134

try:

2960

2135

os.setgid(gid)

2961

2136

os.setuid(uid)

2962

if debug:

2963

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

2964

gid))

2965

2137

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

2138

if error[0] != errno.EPERM:

2139

raise error

2970

2140

2971

2141

if debug:

2972

2142

# Enable all possible GnuTLS debugging

2973

2143

2974

2144

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

2975

2145

# - GnuTLS manual

2976

gnutls.global_set_log_level(11)

2146

gnutls.library.functions.gnutls_global_set_log_level(11)

2977

2147

2978

@gnutls.log_func

2148

@gnutls.library.types.gnutls_log_func

2979

2149

def debug_gnutls(level, string):

2980

2150

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

2981

2151

2982

gnutls.global_set_log_function(debug_gnutls)

2152

(gnutls.library.functions

2153

.gnutls_global_set_log_function(debug_gnutls))

2983

2154

2984

2155

# Redirect stdin so all checkers get /dev/null

2985

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

2156

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

2986

2157

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

2987

2158

if null > 2:

2988

2159

os.close(null)

2989

2160

2990

2161

# Need to fork before connecting to D-Bus

2991

if not foreground:

2162

if not debug:

2992

2163

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

2993

2164

daemon()

2994

2165

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()

2166

gobject.threads_init()

2998

2167

2999

2168

global main_loop

3000

2169

# From the Avahi example code

3001

DBusGMainLoop(set_as_default=True)

3002

main_loop = GLib.MainLoop()

2170

DBusGMainLoop(set_as_default=True )

2171

main_loop = gobject.MainLoop()

3003

2172

bus = dbus.SystemBus()

3004

2173

# End of Avahi example code

3005

2174

if use_dbus:

3006

2175

try:

3007

2176

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)

2177

bus, do_not_queue=True)

2178

old_bus_name = (dbus.service.BusName

2179

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

2180

do_not_queue=True))

2181

except dbus.exceptions.NameExistsException as e:

2182

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

3015

2183

use_dbus = False

3016

2184

server_settings["use_dbus"] = False

3017

2185

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"))

2186

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2187

service = AvahiServiceToSyslog(name =

2188

server_settings["servicename"],

2189

servicetype = "_mandos._tcp",

2190

protocol = protocol, bus = bus)

2191

if server_settings["interface"]:

2192

service.interface = (if_nametoindex

2193

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

3028

2194

3029

2195

global multiprocessing_manager

3030

2196

multiprocessing_manager = multiprocessing.Manager()

3031

2197

3032

2198

client_class = Client

3033

2199

if use_dbus:

3034

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

2200

client_class = functools.partial(ClientDBusTransitional,

2201

bus = bus)

3035

2202

3036

2203

client_settings = Client.config_parser(client_config)

3037

2204

old_client_settings = {}

3038

2205

clients_data = {}

3039

2206

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

2207

# Get client data and settings from last running state.

3049

2208

if server_settings["restore"]:

3050

2209

try:

3051

2210

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"))

2211

clients_data, old_client_settings = (pickle.load

2212

(stored_state))

3097

2213

os.remove(stored_state_path)

3098

2214

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)

2215

logger.warning("Could not load persistent state: {0}"

2216

.format(e))

2217

if e.errno != errno.ENOENT:

3105

2218

raise

3106

2219

except EOFError as e:

3107

2220

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

3108

"EOFError:",

3109

exc_info=e)

2221

"EOFError: {0}".format(e))

3110

2222

3111

2223

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

2224

for client_name, client in clients_data.iteritems():

3117

2225

# Decide which value to use after restoring saved state.

3118

2226

# We have three different values: Old config file,

3119

2227

# new config file, and saved state.

3124

2232

# For each value in new config, check if it

3125

2233

# differs from the old config value (Except for

3126

2234

# the "secret" attribute)

3127

if (name != "secret"

3128

and (value !=

3129

old_client_settings[client_name][name])):

2235

if (name != "secret" and

2236

value != old_client_settings[client_name]

2237

[name]):

3130

2238

client[name] = value

3131

2239

except KeyError:

3132

2240

pass

3133

2241

3134

2242

# 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.

2243

# enabled if its last checker was successful. Clients

2244

# whose checker failed before we stored its state is

2245

# assumed to have failed all checkers during downtime.

3139

2246

if client["enabled"]:

3140

2247

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

3141

2248

if not client["last_checked_ok"]:

3142

2249

logger.warning(

3143

"disabling client {} - Client never "

3144

"performed a successful checker".format(

3145

client_name))

2250

"disabling client {0} - Client never "

2251

"performed a successfull checker"

2252

.format(client["name"]))

3146

2253

client["enabled"] = False

3147

2254

elif client["last_checker_status"] != 0:

3148

2255

logger.warning(

3149

"disabling client {} - Client last"

3150

" checker failed with error code"

3151

" {}".format(

3152

client_name,

3153

client["last_checker_status"]))

2256

"disabling client {0} - Client "

2257

"last checker failed with error code {1}"

2258

.format(client["name"],

2259

client["last_checker_status"]))

3154

2260

client["enabled"] = False

3155

2261

else:

3156

client["expires"] = (

3157

datetime.datetime.utcnow()

3158

+ client["timeout"])

3159

logger.debug("Last checker succeeded,"

3160

" keeping {} enabled".format(

3161

client_name))

2262

client["expires"] = (datetime.datetime

2263

.utcnow()

2264

+ client["timeout"])

2265

3162

2266

try:

3163

client["secret"] = pgp.decrypt(

3164

client["encrypted_secret"],

3165

client_settings[client_name]["secret"])

2267

client["secret"] = (

2268

pgp.decrypt(client["encrypted_secret"],

2269

client_settings[client_name]

2270

["secret"]))

3166

2271

except PGPError:

3167

2272

# 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"])

2273

logger.debug("Failed to decrypt {0} old secret"

2274

.format(client_name))

2275

client["secret"] = (

2276

client_settings[client_name]["secret"])

2277

3172

2278

3173

2279

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

3174

for client_name in (set(old_client_settings)

3175

- set(client_settings)):

2280

for client_name in set(old_client_settings) - set(client_settings):

3176

2281

del clients_data[client_name]

3177

for client_name in (set(client_settings)

3178

- set(old_client_settings)):

2282

for client_name in set(client_settings) - set(old_client_settings):

3179

2283

clients_data[client_name] = client_settings[client_name]

3180

3181

# Create all client objects

3182

for client_name, client in clients_data.items():

2284

2285

# Create clients all clients

2286

for client_name, client in clients_data.iteritems():

3183

2287

tcp_server.clients[client_name] = client_class(

3184

name = client_name,

3185

settings = client,

3186

server_settings = server_settings)

2288

name = client_name, settings = client)

3187

2289

3188

2290

if not tcp_server.clients:

3189

2291

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

2292

2293

if not debug:

2294

try:

2295

with pidfile:

2296

pid = os.getpid()

2297

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

2298

del pidfile

2299

except IOError:

2300

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

2301

pidfilename, pid)

2302

except NameError:

2303

# "pidfile" was never created

2304

pass

3201

2305

del pidfilename

2306

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

3202

2307

3203

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

3204

GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,

3205

lambda: main_loop.quit() and False)

2308

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

2309

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

3206

2310

3207

2311

if use_dbus:

3208

3209

@alternate_dbus_interfaces(

3210

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

3211

class MandosDBusService(DBusObjectWithObjectManager):

2312

class MandosDBusService(dbus.service.Object):

3212

2313

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

3213

3214

2314

def __init__(self):

3215

2315

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

3216

3217

2316

_interface = "se.recompile.Mandos"

3218

2317

3219

2318

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

3226

2325

"D-Bus signal"

3227

2326

pass

3228

2327

3229

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

3230

"true"})

3231

2328

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

3232

2329

def ClientRemoved(self, objpath, name):

3233

2330

"D-Bus signal"

3234

2331

pass

3235

2332

3236

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

3237

"true"})

3238

2333

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

3239

2334

def GetAllClients(self):

3240

2335

"D-Bus method"

3241

return dbus.Array(c.dbus_object_path for c in

3242

tcp_server.clients.values())

2336

return dbus.Array(c.dbus_object_path

2337

for c in

2338

tcp_server.clients.itervalues())

3243

2339

3244

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

3245

"true"})

3246

2340

@dbus.service.method(_interface,

3247

2341

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

3248

2342

def GetAllClientsWithProperties(self):

3249

2343

"D-Bus method"

3250

2344

return dbus.Dictionary(

3251

{ c.dbus_object_path: c.GetAll(

3252

"se.recompile.Mandos.Client")

3253

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

2345

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

2346

for c in tcp_server.clients.itervalues()),

3254

2347

signature="oa{sv}")

3255

2348

3256

2349

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

3257

2350

def RemoveClient(self, object_path):

3258

2351

"D-Bus method"

3259

for c in tcp_server.clients.values():

2352

for c in tcp_server.clients.itervalues():

3260

2353

if c.dbus_object_path == object_path:

3261

2354

del tcp_server.clients[c.name]

3262

2355

c.remove_from_connection()

3263

# Don't signal the disabling

2356

# Don't signal anything except ClientRemoved

3264

2357

c.disable(quiet=True)

3265

# Emit D-Bus signal for removal

3266

self.client_removed_signal(c)

2358

# Emit D-Bus signal

2359

self.ClientRemoved(object_path, c.name)

3267

2360

return

3268

2361

raise KeyError(object_path)

3269

2362

3270

2363

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

2364

3308

mandos_dbus_service = MandosDBusService()

2365

class MandosDBusServiceTransitional(MandosDBusService):

2366

__metaclass__ = AlternateDBusNamesMetaclass

2367

mandos_dbus_service = MandosDBusServiceTransitional()

3309

2368

3310

2369

def cleanup():

3311

2370

"Cleanup function; run on exit"

3312

if zeroconf:

3313

service.cleanup()

2371

service.cleanup()

3314

2372

3315

2373

multiprocessing.active_children()

3316

wnull.close()

3317

2374

if not (tcp_server.clients or client_settings):

3318

2375

return

3319

2376

3322

2379

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

3323

2380

clients = {}

3324

2381

with PGPEngine() as pgp:

3325

for client in tcp_server.clients.values():

2382

for client in tcp_server.clients.itervalues():

3326

2383

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

3327

2384

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

3328

2385

key)

3330

2387

3331

2388

# A list of attributes that can not be pickled

3332

2389

# + secret.

3333

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

3334

"checker", "server_settings" }

3335

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

3336

.Object):

2390

exclude = set(("bus", "changedstate", "secret",

2391

"checker"))

2392

for name, typ in (inspect.getmembers

2393

(dbus.service.Object)):

3337

2394

exclude.add(name)

3338

2395

3339

2396

client_dict["encrypted_secret"] = (client

3346

2403

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

3347

2404

3348

2405

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

2406

tempfd, tempname = tempfile.mkstemp(suffix=".pickle",

2407

prefix="clients-",

2408

dir=os.path.dirname

2409

(stored_state_path))

2410

with os.fdopen(tempfd, "wb") as stored_state:

2411

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

3358

2412

os.rename(tempname, stored_state_path)

3359

2413

except (IOError, OSError) as e:

2414

logger.warning("Could not save persistent state: {0}"

2415

.format(e))

3360

2416

if not debug:

3361

2417

try:

3362

2418

os.remove(tempname)

3363

2419

except NameError:

3364

2420

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

2421

if e.errno not in set((errno.ENOENT, errno.EACCES,

2422

errno.EEXIST)):

2423

raise e

3372

2424

3373

2425

# Delete all clients, and settings from config

3374

2426

while tcp_server.clients:

3375

2427

name, client = tcp_server.clients.popitem()

3376

2428

if use_dbus:

3377

2429

client.remove_from_connection()

3378

# Don't signal the disabling

2430

# Don't signal anything except ClientRemoved

3379

2431

client.disable(quiet=True)

3380

# Emit D-Bus signal for removal

3381

2432

if use_dbus:

3382

mandos_dbus_service.client_removed_signal(client)

2433

# Emit D-Bus signal

2434

mandos_dbus_service.ClientRemoved(client

2435

.dbus_object_path,

2436

client.name)

3383

2437

client_settings.clear()

3384

2438

3385

2439

atexit.register(cleanup)

3386

2440

3387

for client in tcp_server.clients.values():

2441

for client in tcp_server.clients.itervalues():

3388

2442

if use_dbus:

3389

# Emit D-Bus signal for adding

3390

mandos_dbus_service.client_added_signal(client)

2443

# Emit D-Bus signal

2444

mandos_dbus_service.ClientAdded(client.dbus_object_path)

3391

2445

# Need to initiate checking of clients

3392

2446

if client.enabled:

3393

2447

client.init_checker()

3396

2450

tcp_server.server_activate()

3397

2451

3398

2452

# Find out what port we got

3399

if zeroconf:

3400

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

2453

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

3401

2454

if use_ipv6:

3402

2455

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

3403

" flowinfo %d, scope_id %d",

3404

*tcp_server.socket.getsockname())

2456

" flowinfo %d, scope_id %d"

2457

% tcp_server.socket.getsockname())

3405

2458

else: # IPv4

3406

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

3407

*tcp_server.socket.getsockname())

2459

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

2460

% tcp_server.socket.getsockname())

3408

2461

3409

2462

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

3410

2463

3411

2464

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

2465

# From the Avahi example code

2466

try:

2467

service.activate()

2468

except dbus.exceptions.DBusException as error:

2469

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

2470

cleanup()

2471

sys.exit(1)

2472

# End of Avahi example code

3421

2473

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))

2474

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

2475

lambda *args, **kwargs:

2476

(tcp_server.handle_request

2477

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

3426

2478

3427

2479

logger.debug("Starting main loop")

3428

2480

main_loop.run()

3429

2481

except AvahiError as error:

3430

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

2482

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

3431

2483

cleanup()

3432

2484

sys.exit(1)

3433

2485

except KeyboardInterrupt:

3438

2490

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

3439

2491

cleanup()

3440

2492

3441

3442

2493

if __name__ == '__main__':

3443

2494

main()