/mandos/release : revision 237.7.317

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#!/usr/bin/python

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#!/usr/bin/python2.7

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

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#

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

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

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#

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# Everything else is

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#

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

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

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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import SocketServer as socketserver

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from future_builtins import *

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try:

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import SocketServer as socketserver

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except ImportError:

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import socketserver

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import socket

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import argparse

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import datetime

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import gnutls.library.functions

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import gnutls.library.constants

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import gnutls.library.types

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import ConfigParser as configparser

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try:

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import ConfigParser as configparser

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except ImportError:

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import configparser

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import sys

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import re

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import os

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import struct

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import fcntl

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import functools

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import cPickle as pickle

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try:

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import cPickle as pickle

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except ImportError:

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import pickle

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import multiprocessing

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import types

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import binascii

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import tempfile

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import itertools

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import collections

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import codecs

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import dbus

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import dbus.service

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import gobject

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try:

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import gobject

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except ImportError:

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from gi.repository import GObject as 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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version = "1.4.1"

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if sys.version_info.major == 2:

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str = unicode

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version = "1.6.9"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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syslogger = None

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try:

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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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if_nametoindex = ctypes.cdll.LoadLibrary(

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

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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

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

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

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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

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

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return interface_index

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def initlogger(level=logging.WARNING):

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

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"""init logger and add loglevel"""

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global syslogger

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syslogger = (logging.handlers.SysLogHandler(

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facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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address = "/dev/log"))

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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if debug:

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console = logging.StreamHandler()

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

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class 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.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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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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def __enter__(self):

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return self

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

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

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

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if len(encoded) > 2048:

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

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

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

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

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return encoded

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def encrypt(self, data, password):

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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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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(['gpg', '--symmetric',

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return ciphertext

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def decrypt(self, data, password):

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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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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(['gpg', '--decrypt',

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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class AvahiError(Exception):

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

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self.value = value

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

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def __unicode__(self):

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return unicode(repr(self.value))

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

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**kwargs)

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class AvahiServiceError(AvahiError):

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pass

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class AvahiGroupError(AvahiError):

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pass

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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

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

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

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protocol = avahi.PROTO_UNSPEC, bus = None):

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def __init__(self,

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interface = avahi.IF_UNSPEC,

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name = None,

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servicetype = None,

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port = None,

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TXT = None,

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domain = "",

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host = "",

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max_renames = 32768,

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protocol = avahi.PROTO_UNSPEC,

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bus = None):

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self.interface = interface

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self.name = name

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self.type = servicetype

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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def rename(self, remove=True):

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

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if self.rename_count >= self.max_renames:

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

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" after %i retries, exiting.",

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self.rename_count)

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raise AvahiServiceError("Too many renames")

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self.name = unicode(self.server

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.GetAlternativeServiceName(self.name))

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self.name = str(

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self.server.GetAlternativeServiceName(self.name))

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self.rename_count += 1

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

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self.name)

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self.remove()

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if remove:

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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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if (error.get_dbus_name()

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

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

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return self.rename(remove=False)

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else:

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

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self.cleanup()

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os._exit(1)

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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364

self.rename()

319

365

elif state == avahi.ENTRY_GROUP_FAILURE:

320

366

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

321

unicode(error))

322

raise AvahiGroupError("State changed: %s"

323

% unicode(error))

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str(error))

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

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def cleanup(self):

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

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if self.group is not None:

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pass

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self.group = None

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self.remove()

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

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

336

383

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

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bad_states = { avahi.SERVER_INVALID:

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"Zeroconf server invalid",

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avahi.SERVER_REGISTERING: None,

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avahi.SERVER_COLLISION:

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"Zeroconf server name collision",

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avahi.SERVER_FAILURE:

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"Zeroconf server failure" }

384

bad_states = {

385

avahi.SERVER_INVALID: "Zeroconf server invalid",

386

avahi.SERVER_REGISTERING: None,

387

avahi.SERVER_COLLISION: "Zeroconf server name collision",

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avahi.SERVER_FAILURE: "Zeroconf server failure",

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}

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if state in bad_states:

345

391

if bad_states[state] is not None:

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if error is None:

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

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self.cleanup()

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397

elif state == avahi.SERVER_RUNNING:

352

self.add()

398

try:

399

self.add()

400

except dbus.exceptions.DBusException as error:

401

if (error.get_dbus_name()

402

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

403

logger.info("Local Zeroconf service name"

404

" collision.")

405

return self.rename(remove=False)

406

else:

407

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

408

self.cleanup()

409

os._exit(1)

353

410

else:

354

411

if error is None:

355

412

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

356

413

else:

357

414

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

415

358

416

def activate(self):

359

417

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

360

418

if self.server is None:

364

422

follow_name_owner_changes=True),

365

423

avahi.DBUS_INTERFACE_SERVER)

366

424

self.server.connect_to_signal("StateChanged",

367

self.server_state_changed)

425

self.server_state_changed)

368

426

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

369

427

428

370

429

class AvahiServiceToSyslog(AvahiService):

371

def rename(self):

430

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

372

431

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

373

ret = AvahiService.rename(self)

374

syslogger.setFormatter(logging.Formatter

375

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

376

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

377

% self.name))

432

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

433

syslogger.setFormatter(logging.Formatter(

434

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

435

.format(self.name)))

378

436

return ret

379

437

380

def timedelta_to_milliseconds(td):

381

"Convert a datetime.timedelta() to milliseconds"

382

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

383

+ (td.seconds * 1000)

384

+ (td.microseconds // 1000))

385

438

def call_pipe(connection, # : multiprocessing.Connection

439

func, *args, **kwargs):

440

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

441

442

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

443

return value on the provided multiprocessing.Connection.

444

"""

445

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

446

connection.close()

447

386

448

class Client(object):

387

449

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

388

450

413

475

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

414

476

last_checker_status: integer between 0 and 255 reflecting exit

415

477

status of last checker. -1 reflects crashed

416

checker, or None.

478

checker, -2 means no checker completed yet.

479

last_checker_signal: The signal which killed the last checker, if

480

last_checker_status is -1

417

481

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

418

482

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

419

483

D-Bus identifiers

420

484

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

421

485

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

422

486

until this client is disabled

423

extended_timeout: extra long timeout when password has been sent

487

extended_timeout: extra long timeout when secret has been sent

424

488

runtime_expansions: Allowed attributes for runtime expansion.

425

489

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

426

490

disabled, or None

491

server_settings: The server_settings dict from main()

427

492

"""

428

493

429

494

runtime_expansions = ("approval_delay", "approval_duration",

430

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

431

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

495

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

496

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

497

"last_approval_request", "last_checked_ok",

432

498

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

433

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

434

"extended_timeout": "15m",

435

"interval": "2m",

436

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

437

"host": "",

438

"approval_delay": "0s",

439

"approval_duration": "1s",

440

"approved_by_default": "True",

441

"enabled": "True",

442

}

443

444

def timeout_milliseconds(self):

445

"Return the 'timeout' attribute in milliseconds"

446

return timedelta_to_milliseconds(self.timeout)

447

448

def extended_timeout_milliseconds(self):

449

"Return the 'extended_timeout' attribute in milliseconds"

450

return timedelta_to_milliseconds(self.extended_timeout)

451

452

def interval_milliseconds(self):

453

"Return the 'interval' attribute in milliseconds"

454

return timedelta_to_milliseconds(self.interval)

455

456

def approval_delay_milliseconds(self):

457

return timedelta_to_milliseconds(self.approval_delay)

458

499

client_defaults = {

500

"timeout": "PT5M",

501

"extended_timeout": "PT15M",

502

"interval": "PT2M",

503

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

504

"host": "",

505

"approval_delay": "PT0S",

506

"approval_duration": "PT1S",

507

"approved_by_default": "True",

508

"enabled": "True",

509

}

510

459

511

@staticmethod

460

512

def config_parser(config):

461

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

513

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

462

514

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

463

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

515

with exceptions for any special settings as defined above.

516

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

517

value given the same arguments.

518

"""

464

519

settings = {}

465

520

for client_name in config.sections():

466

521

section = dict(config.items(client_name))

470

525

# Reformat values from string types to Python types

471

526

client["approved_by_default"] = config.getboolean(

472

527

client_name, "approved_by_default")

473

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

528

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

529

"enabled")

474

530

531

# Uppercase and remove spaces from fingerprint for later

532

# comparison purposes with return value from the

533

# fingerprint() function

475

534

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

476

535

.replace(" ", ""))

477

536

if "secret" in section:

482

541

"rb") as secfile:

483

542

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

484

543

else:

485

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

486

% section)

544

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

545

.format(section))

487

546

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

488

547

client["extended_timeout"] = string_to_delta(

489

548

section["extended_timeout"])

495

554

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

496

555

client["last_approval_request"] = None

497

556

client["last_checked_ok"] = None

498

client["last_checker_status"] = None

499

if client["enabled"]:

500

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

501

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

502

+ client["timeout"])

503

else:

504

client["last_enabled"] = None

505

client["expires"] = None

506

557

client["last_checker_status"] = -2

558

507

559

return settings

508

509

510

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

511

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

512

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

513

attribute."""

560

561

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

514

562

self.name = name

563

if server_settings is None:

564

server_settings = {}

565

self.server_settings = server_settings

515

566

# adding all client settings

516

for setting, value in settings.iteritems():

567

for setting, value in settings.items():

517

568

setattr(self, setting, value)

518

569

570

if self.enabled:

571

if not hasattr(self, "last_enabled"):

572

self.last_enabled = datetime.datetime.utcnow()

573

if not hasattr(self, "expires"):

574

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

575

+ self.timeout)

576

else:

577

self.last_enabled = None

578

self.expires = None

579

519

580

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

520

# Uppercase and remove spaces from fingerprint for later

521

# comparison purposes with return value from the fingerprint()

522

# function

523

581

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

524

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

525

582

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

583

datetime.datetime.utcnow())

584

526

585

# attributes specific for this server instance

527

586

self.checker = None

528

587

self.checker_initiator_tag = None

531

590

self.current_checker_command = None

532

591

self.approved = None

533

592

self.approvals_pending = 0

534

self.changedstate = (multiprocessing_manager

535

.Condition(multiprocessing_manager

536

.Lock()))

537

self.client_structure = [attr for attr in

538

self.__dict__.iterkeys()

593

self.changedstate = multiprocessing_manager.Condition(

594

multiprocessing_manager.Lock())

595

self.client_structure = [attr

596

for attr in self.__dict__.iterkeys()

539

597

if not attr.startswith("_")]

540

598

self.client_structure.append("client_structure")

541

599

542

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

543

lambda obj:

544

isinstance(obj,

545

property)):

600

for name, t in inspect.getmembers(

601

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

546

602

if not name.startswith("_"):

547

603

self.client_structure.append(name)

548

604

556

612

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

557

613

# Already enabled

558

614

return

559

self.send_changedstate()

560

615

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

561

616

self.enabled = True

562

617

self.last_enabled = datetime.datetime.utcnow()

563

618

self.init_checker()

619

self.send_changedstate()

564

620

565

621

def disable(self, quiet=True):

566

622

"""Disable this client."""

567

623

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

568

624

return False

569

625

if not quiet:

570

self.send_changedstate()

571

if not quiet:

572

626

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

573

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

627

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

574

628

gobject.source_remove(self.disable_initiator_tag)

575

629

self.disable_initiator_tag = None

576

630

self.expires = None

577

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

631

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

578

632

gobject.source_remove(self.checker_initiator_tag)

579

633

self.checker_initiator_tag = None

580

634

self.stop_checker()

581

635

self.enabled = False

636

if not quiet:

637

self.send_changedstate()

582

638

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

583

639

return False

584

640

588

644

def init_checker(self):

589

645

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

590

646

# and every interval from then on.

591

self.checker_initiator_tag = (gobject.timeout_add

592

(self.interval_milliseconds(),

593

self.start_checker))

647

if self.checker_initiator_tag is not None:

648

gobject.source_remove(self.checker_initiator_tag)

649

self.checker_initiator_tag = gobject.timeout_add(

650

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

651

self.start_checker)

594

652

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

595

self.disable_initiator_tag = (gobject.timeout_add

596

(self.timeout_milliseconds(),

597

self.disable))

653

if self.disable_initiator_tag is not None:

654

gobject.source_remove(self.disable_initiator_tag)

655

self.disable_initiator_tag = gobject.timeout_add(

656

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

598

657

# Also start a new checker *right now*.

599

658

self.start_checker()

600

659

601

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

660

def checker_callback(self, source, condition, connection,

661

command):

602

662

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

603

663

self.checker_callback_tag = None

604

664

self.checker = None

605

if os.WIFEXITED(condition):

606

self.last_checker_status = os.WEXITSTATUS(condition)

665

# Read return code from connection (see call_pipe)

666

returncode = connection.recv()

667

connection.close()

668

669

if returncode >= 0:

670

self.last_checker_status = returncode

671

self.last_checker_signal = None

607

672

if self.last_checker_status == 0:

608

673

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

609

674

vars(self))

610

675

self.checked_ok()

611

676

else:

612

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

613

vars(self))

677

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

614

678

else:

615

679

self.last_checker_status = -1

680

self.last_checker_signal = -returncode

616

681

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

617

682

vars(self))

618

619

def checked_ok(self, timeout=None):

620

"""Bump up the timeout for this client.

621

622

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

623

alive and well.

624

"""

683

return False

684

685

def checked_ok(self):

686

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

687

self.last_checked_ok = datetime.datetime.utcnow()

688

self.last_checker_status = 0

689

self.last_checker_signal = None

690

self.bump_timeout()

691

692

def bump_timeout(self, timeout=None):

693

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

625

694

if timeout is None:

626

695

timeout = self.timeout

627

self.last_checked_ok = datetime.datetime.utcnow()

628

696

if self.disable_initiator_tag is not None:

629

697

gobject.source_remove(self.disable_initiator_tag)

698

self.disable_initiator_tag = None

630

699

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

631

self.disable_initiator_tag = (gobject.timeout_add

632

(timedelta_to_milliseconds

633

(timeout), self.disable))

700

self.disable_initiator_tag = gobject.timeout_add(

701

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

634

702

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

635

703

636

704

def need_approval(self):

642

710

If a checker already exists, leave it running and do

643

711

nothing."""

644

712

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

645

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

646

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

647

# client would inevitably timeout, since no checker would get

648

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

713

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

714

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

715

# would inevitably timeout, since no checker would get a

716

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

649

717

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

650

718

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

651

719

# should be.

652

720

653

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

654

try:

655

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

656

except (AttributeError, OSError) as error:

657

if (isinstance(error, OSError)

658

and error.errno != errno.ECHILD):

659

raise error

660

else:

661

if pid:

662

logger.warning("Checker was a zombie")

663

gobject.source_remove(self.checker_callback_tag)

664

self.checker_callback(pid, status,

665

self.current_checker_command)

721

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

722

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

723

self.checker.join()

724

self.checker = None

666

725

# Start a new checker if needed

667

726

if self.checker is None:

727

# Escape attributes for the shell

728

escaped_attrs = {

729

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

730

for attr in self.runtime_expansions }

668

731

try:

669

# In case checker_command has exactly one % operator

670

command = self.checker_command % self.host

671

except TypeError:

672

# Escape attributes for the shell

673

escaped_attrs = dict(

674

(attr,

675

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

676

errors=

677

'replace')))

678

for attr in

679

self.runtime_expansions)

680

681

try:

682

command = self.checker_command % escaped_attrs

683

except TypeError as error:

684

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

685

' %s', self.checker_command, error)

686

return True # Try again later

732

command = self.checker_command % escaped_attrs

733

except TypeError as error:

734

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

735

self.checker_command,

736

exc_info=error)

737

return True # Try again later

687

738

self.current_checker_command = command

688

try:

689

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

690

command, self.name)

691

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

692

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

693

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

694

# always replaced by /dev/null.)

695

self.checker = subprocess.Popen(command,

696

close_fds=True,

697

shell=True, cwd="/")

698

self.checker_callback_tag = (gobject.child_watch_add

699

(self.checker.pid,

700

self.checker_callback,

701

data=command))

702

# The checker may have completed before the gobject

703

# watch was added. Check for this.

704

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

705

if pid:

706

gobject.source_remove(self.checker_callback_tag)

707

self.checker_callback(pid, status, command)

708

except OSError as error:

709

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

710

error)

739

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

740

self.name)

741

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

742

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

743

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

744

# always replaced by /dev/null.)

745

# The exception is when not debugging but nevertheless

746

# running in the foreground; use the previously

747

# created wnull.

748

popen_args = { "close_fds": True,

749

"shell": True,

750

"cwd": "/" }

751

if (not self.server_settings["debug"]

752

and self.server_settings["foreground"]):

753

popen_args.update({"stdout": wnull,

754

"stderr": wnull })

755

pipe = multiprocessing.Pipe(duplex = False)

756

self.checker = multiprocessing.Process(

757

target = call_pipe,

758

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

759

kwargs = popen_args)

760

self.checker.start()

761

self.checker_callback_tag = gobject.io_add_watch(

762

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

763

self.checker_callback, pipe[0], command)

711

764

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

712

765

return True

713

766

719

772

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

720

773

return

721

774

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

722

try:

723

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

724

#time.sleep(0.5)

725

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

726

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

727

except OSError as error:

728

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

729

raise

775

self.checker.terminate()

730

776

self.checker = None

731

777

732

778

733

def dbus_service_property(dbus_interface, signature="v",

734

access="readwrite", byte_arrays=False):

779

def dbus_service_property(dbus_interface,

780

signature="v",

781

access="readwrite",

782

byte_arrays=False):

735

783

"""Decorators for marking methods of a DBusObjectWithProperties to

736

784

become properties on the D-Bus.

737

785

746

794

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

747

795

if byte_arrays and signature != "ay":

748

796

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

749

" signature %r" % signature)

797

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

798

750

799

def decorator(func):

751

800

func._dbus_is_property = True

752

801

func._dbus_interface = dbus_interface

757

806

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

758

807

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

759

808

return func

809

810

return decorator

811

812

813

def dbus_interface_annotations(dbus_interface):

814

"""Decorator for marking functions returning interface annotations

815

816

Usage:

817

818

@dbus_interface_annotations("org.example.Interface")

819

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

820

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

821

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

822

"false"}

823

"""

824

825

def decorator(func):

826

func._dbus_is_interface = True

827

func._dbus_interface = dbus_interface

828

func._dbus_name = dbus_interface

829

return func

830

831

return decorator

832

833

834

def dbus_annotations(annotations):

835

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

836

Usage:

837

838

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

839

"org.freedesktop.DBus.Property."

840

"EmitsChangedSignal": "false"})

841

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

842

access="r")

843

def Property_dbus_property(self):

844

return dbus.Boolean(False)

845

"""

846

847

def decorator(func):

848

func._dbus_annotations = annotations

849

return func

850

760

851

return decorator

761

852

762

853

763

854

class DBusPropertyException(dbus.exceptions.DBusException):

764

855

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

765

856

"""

766

def __unicode__(self):

767

return unicode(str(self))

857

pass

768

858

769

859

770

860

class DBusPropertyAccessException(DBusPropertyException):

788

878

"""

789

879

790

880

@staticmethod

791

def _is_dbus_property(obj):

792

return getattr(obj, "_dbus_is_property", False)

881

def _is_dbus_thing(thing):

882

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

883

884

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

885

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

886

"""

887

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

888

False)

793

889

794

def _get_all_dbus_properties(self):

890

def _get_all_dbus_things(self, thing):

795

891

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

796

892

"""

797

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

893

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

894

athing.__get__(self))

798

895

for cls in self.__class__.__mro__

799

for name, prop in

800

inspect.getmembers(cls, self._is_dbus_property))

896

for name, athing in

897

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

801

898

802

899

def _get_dbus_property(self, interface_name, property_name):

803

900

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

804

901

property with the specified name and interface.

805

902

"""

806

for cls in self.__class__.__mro__:

807

for name, value in (inspect.getmembers

808

(cls, self._is_dbus_property)):

903

for cls in self.__class__.__mro__:

904

for name, value in inspect.getmembers(

905

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

809

906

if (value._dbus_name == property_name

810

907

and value._dbus_interface == interface_name):

811

908

return value.__get__(self)

812

909

813

910

# No such property

814

raise DBusPropertyNotFound(self.dbus_object_path + ":"

815

+ interface_name + "."

816

+ property_name)

911

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

912

self.dbus_object_path, interface_name, property_name))

817

913

818

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

914

@dbus.service.method(dbus.PROPERTIES_IFACE,

915

in_signature="ss",

819

916

out_signature="v")

820

917

def Get(self, interface_name, property_name):

821

918

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

839

936

# The byte_arrays option is not supported yet on

840

937

# signatures other than "ay".

841

938

if prop._dbus_signature != "ay":

842

raise ValueError

843

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

844

for byte in value))

939

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

940

"'ay' signature {!r}"

941

.format(prop._dbus_signature))

942

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

943

for byte in value))

845

944

prop(value)

846

945

847

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

946

@dbus.service.method(dbus.PROPERTIES_IFACE,

947

in_signature="s",

848

948

out_signature="a{sv}")

849

949

def GetAll(self, interface_name):

850

950

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

853

953

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

854

954

"""

855

955

properties = {}

856

for name, prop in self._get_all_dbus_properties():

956

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

857

957

if (interface_name

858

958

and interface_name != prop._dbus_interface):

859

959

# Interface non-empty but did not match

865

965

if not hasattr(value, "variant_level"):

866

966

properties[name] = value

867

967

continue

868

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

869

value.variant_level+1)

968

properties[name] = type(value)(

969

value, variant_level = value.variant_level + 1)

870

970

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

871

971

972

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

973

def PropertiesChanged(self, interface_name, changed_properties,

974

invalidated_properties):

975

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

976

standard.

977

"""

978

pass

979

872

980

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

873

981

out_signature="s",

874

982

path_keyword='object_path',

875

983

connection_keyword='connection')

876

984

def Introspect(self, object_path, connection):

877

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

985

"""Overloading of standard D-Bus method.

986

987

Inserts property tags and interface annotation tags.

878

988

"""

879

989

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

880

990

connection)

881

991

try:

882

992

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

993

883

994

def make_tag(document, name, prop):

884

995

e = document.createElement("property")

885

996

e.setAttribute("name", name)

886

997

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

887

998

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

888

999

return e

1000

889

1001

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

1002

# Add property tags

890

1003

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

891

1004

for name, prop

892

in self._get_all_dbus_properties()

1005

in self._get_all_dbus_things("property")

893

1006

if prop._dbus_interface

894

1007

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

895

1008

if_tag.appendChild(tag)

1009

# Add annotation tags

1010

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

1011

for tag in if_tag.getElementsByTagName(typ):

1012

annots = dict()

1013

for name, prop in (self.

1014

_get_all_dbus_things(typ)):

1015

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

1016

and prop._dbus_interface

1017

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

1018

annots.update(getattr(

1019

prop, "_dbus_annotations", {}))

1020

for name, value in annots.items():

1021

ann_tag = document.createElement(

1022

"annotation")

1023

ann_tag.setAttribute("name", name)

1024

ann_tag.setAttribute("value", value)

1025

tag.appendChild(ann_tag)

1026

# Add interface annotation tags

1027

for annotation, value in dict(

1028

itertools.chain.from_iterable(

1029

annotations().items()

1030

for name, annotations

1031

in self._get_all_dbus_things("interface")

1032

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

1033

)).items():

1034

ann_tag = document.createElement("annotation")

1035

ann_tag.setAttribute("name", annotation)

1036

ann_tag.setAttribute("value", value)

1037

if_tag.appendChild(ann_tag)

896

1038

# Add the names to the return values for the

897

1039

# "org.freedesktop.DBus.Properties" methods

898

1040

if (if_tag.getAttribute("name")

913

1055

except (AttributeError, xml.dom.DOMException,

914

1056

xml.parsers.expat.ExpatError) as error:

915

1057

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

916

error)

1058

exc_info=error)

917

1059

return xmlstring

918

1060

919

1061

920

def datetime_to_dbus (dt, variant_level=0):

1062

def datetime_to_dbus(dt, variant_level=0):

921

1063

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

922

1064

if dt is None:

923

1065

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

924

return dbus.String(dt.isoformat(),

925

variant_level=variant_level)

926

927

928

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

929

.__metaclass__):

930

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

931

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

1066

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

1067

1068

1069

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1070

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

1071

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

1072

interface names according to the "alt_interface_names" mapping.

1073

Usage:

1074

1075

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

1076

"net.example.AlternateInterface"})

1077

class SampleDBusObject(dbus.service.Object):

1078

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

1079

def SampleDBusMethod():

1080

pass

1081

1082

The above "SampleDBusMethod" on "SampleDBusObject" will be

1083

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

1084

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

1085

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

1086

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

1087

1088

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

1089

(from DBusObjectWithProperties) and interfaces (from the

1090

dbus_interface_annotations decorator).

932

1091

"""

933

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

934

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

935

# methods, signals, or properties in them

936

for base in (b for b in bases

937

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

938

# Go though all attributes of the base class

939

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

1092

1093

def wrapper(cls):

1094

for orig_interface_name, alt_interface_name in (

1095

alt_interface_names.items()):

1096

attr = {}

1097

interface_names = set()

1098

# Go though all attributes of the class

1099

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

940

1100

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

941

1101

# with the wrong interface name

942

1102

if (not hasattr(attribute, "_dbus_interface")

943

or not attribute._dbus_interface

944

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

1103

or not attribute._dbus_interface.startswith(

1104

orig_interface_name)):

945

1105

continue

946

1106

# Create an alternate D-Bus interface name based on

947

1107

# the current name

948

alt_interface = (attribute._dbus_interface

949

.replace("se.recompile.Mandos",

950

"se.bsnet.fukt.Mandos"))

1108

alt_interface = attribute._dbus_interface.replace(

1109

orig_interface_name, alt_interface_name)

1110

interface_names.add(alt_interface)

951

1111

# Is this a D-Bus signal?

952

1112

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

953

# Extract the original non-method function by

954

# black magic

955

nonmethod_func = (dict(

1113

if sys.version_info.major == 2:

1114

# Extract the original non-method undecorated

1115

# function by black magic

1116

nonmethod_func = (dict(

956

1117

zip(attribute.func_code.co_freevars,

957

attribute.__closure__))["func"]

958

.cell_contents)

1118

attribute.__closure__))

1119

["func"].cell_contents)

1120

else:

1121

nonmethod_func = attribute

959

1122

# Create a new, but exactly alike, function

960

1123

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

961

1124

# with the alternate D-Bus interface name

962

new_function = (dbus.service.signal

963

(alt_interface,

964

attribute._dbus_signature)

965

(types.FunctionType(

966

nonmethod_func.func_code,

967

nonmethod_func.func_globals,

968

nonmethod_func.func_name,

969

nonmethod_func.func_defaults,

970

nonmethod_func.func_closure)))

1125

if sys.version_info.major == 2:

1126

new_function = types.FunctionType(

1127

nonmethod_func.func_code,

1128

nonmethod_func.func_globals,

1129

nonmethod_func.func_name,

1130

nonmethod_func.func_defaults,

1131

nonmethod_func.func_closure)

1132

else:

1133

new_function = types.FunctionType(

1134

nonmethod_func.__code__,

1135

nonmethod_func.__globals__,

1136

nonmethod_func.__name__,

1137

nonmethod_func.__defaults__,

1138

nonmethod_func.__closure__)

1139

new_function = (dbus.service.signal(

1140

alt_interface,

1141

attribute._dbus_signature)(new_function))

1142

# Copy annotations, if any

1143

try:

1144

new_function._dbus_annotations = dict(

1145

attribute._dbus_annotations)

1146

except AttributeError:

1147

pass

971

1148

# Define a creator of a function to call both the

972

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

973

# signals gets sent when the function is called

1149

# original and alternate functions, so both the

1150

# original and alternate signals gets sent when

1151

# the function is called

974

1152

def fixscope(func1, func2):

975

1153

"""This function is a scope container to pass

976

1154

func1 and func2 to the "call_both" function

977

1155

outside of its arguments"""

1156

978

1157

def call_both(*args, **kwargs):

979

1158

"""This function will emit two D-Bus

980

1159

signals by calling func1 and func2"""

981

1160

func1(*args, **kwargs)

982

1161

func2(*args, **kwargs)

1162

983

1163

return call_both

984

1164

# Create the "call_both" function and add it to

985

1165

# the class

986

attr[attrname] = fixscope(attribute,

987

new_function)

1166

attr[attrname] = fixscope(attribute, new_function)

988

1167

# Is this a D-Bus method?

989

1168

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

990

1169

# Create a new, but exactly alike, function

991

1170

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

992

1171

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

993

1172

# to the class.

994

attr[attrname] = (dbus.service.method

995

(alt_interface,

996

attribute._dbus_in_signature,

997

attribute._dbus_out_signature)

998

(types.FunctionType

999

(attribute.func_code,

1000

attribute.func_globals,

1001

attribute.func_name,

1002

attribute.func_defaults,

1003

attribute.func_closure)))

1173

attr[attrname] = (

1174

dbus.service.method(

1175

alt_interface,

1176

attribute._dbus_in_signature,

1177

attribute._dbus_out_signature)

1178

(types.FunctionType(attribute.func_code,

1179

attribute.func_globals,

1180

attribute.func_name,

1181

attribute.func_defaults,

1182

attribute.func_closure)))

1183

# Copy annotations, if any

1184

try:

1185

attr[attrname]._dbus_annotations = dict(

1186

attribute._dbus_annotations)

1187

except AttributeError:

1188

pass

1004

1189

# Is this a D-Bus property?

1005

1190

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

1006

1191

# Create a new, but exactly alike, function

1007

1192

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

1008

1193

# property with the alternate D-Bus interface

1009

1194

# name. Add it to the class.

1010

attr[attrname] = (dbus_service_property

1011

(alt_interface,

1012

attribute._dbus_signature,

1013

attribute._dbus_access,

1014

attribute

1015

._dbus_get_args_options

1016

["byte_arrays"])

1017

(types.FunctionType

1018

(attribute.func_code,

1019

attribute.func_globals,

1020

attribute.func_name,

1021

attribute.func_defaults,

1022

attribute.func_closure)))

1023

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

1024

1025

1195

attr[attrname] = (dbus_service_property(

1196

alt_interface, attribute._dbus_signature,

1197

attribute._dbus_access,

1198

attribute._dbus_get_args_options

1199

["byte_arrays"])

1200

(types.FunctionType(

1201

attribute.func_code,

1202

attribute.func_globals,

1203

attribute.func_name,

1204

attribute.func_defaults,

1205

attribute.func_closure)))

1206

# Copy annotations, if any

1207

try:

1208

attr[attrname]._dbus_annotations = dict(

1209

attribute._dbus_annotations)

1210

except AttributeError:

1211

pass

1212

# Is this a D-Bus interface?

1213

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

1214

# Create a new, but exactly alike, function

1215

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

1216

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

1217

# to the class.

1218

attr[attrname] = (

1219

dbus_interface_annotations(alt_interface)

1220

(types.FunctionType(attribute.func_code,

1221

attribute.func_globals,

1222

attribute.func_name,

1223

attribute.func_defaults,

1224

attribute.func_closure)))

1225

if deprecate:

1226

# Deprecate all alternate interfaces

1227

iname="_AlternateDBusNames_interface_annotation{}"

1228

for interface_name in interface_names:

1229

1230

@dbus_interface_annotations(interface_name)

1231

def func(self):

1232

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

1233

"true" }

1234

# Find an unused name

1235

for aname in (iname.format(i)

1236

for i in itertools.count()):

1237

if aname not in attr:

1238

attr[aname] = func

1239

break

1240

if interface_names:

1241

# Replace the class with a new subclass of it with

1242

# methods, signals, etc. as created above.

1243

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

1244

(cls, ), attr)

1245

return cls

1246

1247

return wrapper

1248

1249

1250

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

1251

"se.bsnet.fukt.Mandos"})

1026

1252

class ClientDBus(Client, DBusObjectWithProperties):

1027

1253

"""A Client class using D-Bus

1028

1254

1032

1258

"""

1033

1259

1034

1260

runtime_expansions = (Client.runtime_expansions

1035

+ ("dbus_object_path",))

1261

+ ("dbus_object_path", ))

1262

1263

_interface = "se.recompile.Mandos.Client"

1036

1264

1037

1265

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

1038

1266

1039

1267

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

1040

1268

self.bus = bus

1041

1269

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

1042

self._approvals_pending = 0

1043

1044

self._approvals_pending = 0

1045

1270

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

1046

1271

# the D-Bus

1047

client_object_name = unicode(self.name).translate(

1272

client_object_name = str(self.name).translate(

1048

1273

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

1049

1274

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

1050

self.dbus_object_path = (dbus.ObjectPath

1051

("/clients/" + client_object_name))

1275

self.dbus_object_path = dbus.ObjectPath(

1276

"/clients/" + client_object_name)

1052

1277

DBusObjectWithProperties.__init__(self, self.bus,

1053

1278

self.dbus_object_path)

1054

1055

def notifychangeproperty(transform_func,

1056

dbus_name, type_func=lambda x: x,

1057

variant_level=1):

1279

1280

def notifychangeproperty(transform_func, dbus_name,

1281

type_func=lambda x: x,

1282

variant_level=1,

1283

invalidate_only=False,

1284

_interface=_interface):

1058

1285

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

1059

1286

its changes to DBus.

1060

1287

1065

1292

to the D-Bus. Default: no transform

1066

1293

variant_level: D-Bus variant level. Default: 1

1067

1294

"""

1068

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

1295

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

1296

1069

1297

def setter(self, value):

1070

1298

if hasattr(self, "dbus_object_path"):

1071

1299

if (not hasattr(self, attrname) or

1072

1300

type_func(getattr(self, attrname, None))

1073

1301

!= type_func(value)):

1074

dbus_value = transform_func(type_func(value),

1075

variant_level

1076

=variant_level)

1077

self.PropertyChanged(dbus.String(dbus_name),

1078

dbus_value)

1302

if invalidate_only:

1303

self.PropertiesChanged(

1304

_interface, dbus.Dictionary(),

1305

dbus.Array((dbus_name, )))

1306

else:

1307

dbus_value = transform_func(

1308

type_func(value),

1309

variant_level = variant_level)

1310

self.PropertyChanged(dbus.String(dbus_name),

1311

dbus_value)

1312

self.PropertiesChanged(

1313

_interface,

1314

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

1315

dbus_value }),

1316

dbus.Array())

1079

1317

setattr(self, attrname, value)

1080

1318

1081

1319

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

1082

1320

1083

1084

1321

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1085

1322

approvals_pending = notifychangeproperty(dbus.Boolean,

1086

1323

"ApprovalPending",

1088

1325

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

1089

1326

last_enabled = notifychangeproperty(datetime_to_dbus,

1090

1327

"LastEnabled")

1091

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

1092

type_func = lambda checker:

1093

checker is not None)

1328

checker = notifychangeproperty(

1329

dbus.Boolean, "CheckerRunning",

1330

type_func = lambda checker: checker is not None)

1094

1331

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1095

1332

"LastCheckedOK")

1333

last_checker_status = notifychangeproperty(dbus.Int16,

1334

"LastCheckerStatus")

1096

1335

last_approval_request = notifychangeproperty(

1097

1336

datetime_to_dbus, "LastApprovalRequest")

1098

1337

approved_by_default = notifychangeproperty(dbus.Boolean,

1099

1338

"ApprovedByDefault")

1100

approval_delay = notifychangeproperty(dbus.UInt64,

1101

"ApprovalDelay",

1102

type_func =

1103

timedelta_to_milliseconds)

1339

approval_delay = notifychangeproperty(

1340

dbus.UInt64, "ApprovalDelay",

1341

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

1104

1342

approval_duration = notifychangeproperty(

1105

1343

dbus.UInt64, "ApprovalDuration",

1106

type_func = timedelta_to_milliseconds)

1344

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

1107

1345

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

1108

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

1109

type_func =

1110

timedelta_to_milliseconds)

1346

timeout = notifychangeproperty(

1347

dbus.UInt64, "Timeout",

1348

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

1111

1349

extended_timeout = notifychangeproperty(

1112

1350

dbus.UInt64, "ExtendedTimeout",

1113

type_func = timedelta_to_milliseconds)

1114

interval = notifychangeproperty(dbus.UInt64,

1115

"Interval",

1116

type_func =

1117

timedelta_to_milliseconds)

1351

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

1352

interval = notifychangeproperty(

1353

dbus.UInt64, "Interval",

1354

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

1118

1355

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

1356

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

1357

invalidate_only=True)

1119

1358

1120

1359

del notifychangeproperty

1121

1360

1128

1367

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

1129

1368

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

1130

1369

1131

def checker_callback(self, pid, condition, command,

1132

*args, **kwargs):

1133

self.checker_callback_tag = None

1134

self.checker = None

1135

if os.WIFEXITED(condition):

1136

exitstatus = os.WEXITSTATUS(condition)

1370

def checker_callback(self, source, condition,

1371

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

1372

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

1373

connection, command, *args,

1374

**kwargs)

1375

exitstatus = self.last_checker_status

1376

if exitstatus >= 0:

1137

1377

# Emit D-Bus signal

1138

1378

self.CheckerCompleted(dbus.Int16(exitstatus),

1139

dbus.Int64(condition),

1379

dbus.Int64(0),

1140

1380

dbus.String(command))

1141

1381

else:

1142

1382

# Emit D-Bus signal

1143

1383

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

1144

dbus.Int64(condition),

1384

dbus.Int64(

1385

self.last_checker_signal),

1145

1386

dbus.String(command))

1146

1147

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

1148

*args, **kwargs)

1387

return ret

1149

1388

1150

1389

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

1151

old_checker = self.checker

1152

if self.checker is not None:

1153

old_checker_pid = self.checker.pid

1154

else:

1155

old_checker_pid = None

1390

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

1156

1391

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

1157

1392

# Only if new checker process was started

1158

1393

if (self.checker is not None

1166

1401

return False

1167

1402

1168

1403

def approve(self, value=True):

1169

self.send_changedstate()

1170

1404

self.approved = value

1171

gobject.timeout_add(timedelta_to_milliseconds

1172

(self.approval_duration),

1173

self._reset_approved)

1174

1405

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

1406

* 1000), self._reset_approved)

1407

self.send_changedstate()

1175

1408

1176

1409

## D-Bus methods, signals & properties

1177

_interface = "se.recompile.Mandos.Client"

1410

1411

## Interfaces

1178

1412

1179

1413

## Signals

1180

1414

1191

1425

pass

1192

1426

1193

1427

# PropertyChanged - signal

1428

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

1194

1429

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

1195

1430

def PropertyChanged(self, property, value):

1196

1431

"D-Bus signal"

1217

1452

"D-Bus signal"

1218

1453

return self.need_approval()

1219

1454

1220

# NeRwequest - signal

1221

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

1222

def NewRequest(self, ip):

1223

"""D-Bus signal

1224

Is sent after a client request a password.

1225

"""

1226

pass

1227

1228

1455

## Methods

1229

1456

1230

1457

# Approve - method

1268

1495

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

1269

1496

1270

1497

# ApprovedByDefault - property

1271

@dbus_service_property(_interface, signature="b",

1498

@dbus_service_property(_interface,

1499

signature="b",

1272

1500

access="readwrite")

1273

1501

def ApprovedByDefault_dbus_property(self, value=None):

1274

1502

if value is None: # get

1276

1504

self.approved_by_default = bool(value)

1277

1505

1278

1506

# ApprovalDelay - property

1279

@dbus_service_property(_interface, signature="t",

1507

@dbus_service_property(_interface,

1508

signature="t",

1280

1509

access="readwrite")

1281

1510

def ApprovalDelay_dbus_property(self, value=None):

1282

1511

if value is None: # get

1283

return dbus.UInt64(self.approval_delay_milliseconds())

1512

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

1513

* 1000)

1284

1514

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

1285

1515

1286

1516

# ApprovalDuration - property

1287

@dbus_service_property(_interface, signature="t",

1517

@dbus_service_property(_interface,

1518

signature="t",

1288

1519

access="readwrite")

1289

1520

def ApprovalDuration_dbus_property(self, value=None):

1290

1521

if value is None: # get

1291

return dbus.UInt64(timedelta_to_milliseconds(

1292

self.approval_duration))

1522

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

1523

* 1000)

1293

1524

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

1294

1525

1295

1526

# Name - property

1303

1534

return dbus.String(self.fingerprint)

1304

1535

1305

1536

# Host - property

1306

@dbus_service_property(_interface, signature="s",

1537

@dbus_service_property(_interface,

1538

signature="s",

1307

1539

access="readwrite")

1308

1540

def Host_dbus_property(self, value=None):

1309

1541

if value is None: # get

1310

1542

return dbus.String(self.host)

1311

self.host = unicode(value)

1543

self.host = str(value)

1312

1544

1313

1545

# Created - property

1314

1546

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

1321

1553

return datetime_to_dbus(self.last_enabled)

1322

1554

1323

1555

# Enabled - property

1324

@dbus_service_property(_interface, signature="b",

1556

@dbus_service_property(_interface,

1557

signature="b",

1325

1558

access="readwrite")

1326

1559

def Enabled_dbus_property(self, value=None):

1327

1560

if value is None: # get

1332

1565

self.disable()

1333

1566

1334

1567

# LastCheckedOK - property

1335

@dbus_service_property(_interface, signature="s",

1568

@dbus_service_property(_interface,

1569

signature="s",

1336

1570

access="readwrite")

1337

1571

def LastCheckedOK_dbus_property(self, value=None):

1338

1572

if value is not None:

1340

1574

return

1341

1575

return datetime_to_dbus(self.last_checked_ok)

1342

1576

1577

# LastCheckerStatus - property

1578

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

1579

def LastCheckerStatus_dbus_property(self):

1580

return dbus.Int16(self.last_checker_status)

1581

1343

1582

# Expires - property

1344

1583

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

1345

1584

def Expires_dbus_property(self):

1351

1590

return datetime_to_dbus(self.last_approval_request)

1352

1591

1353

1592

# Timeout - property

1354

@dbus_service_property(_interface, signature="t",

1593

@dbus_service_property(_interface,

1594

signature="t",

1355

1595

access="readwrite")

1356

1596

def Timeout_dbus_property(self, value=None):

1357

1597

if value is None: # get

1358

return dbus.UInt64(self.timeout_milliseconds())

1598

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

1599

old_timeout = self.timeout

1359

1600

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

1360

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

1361

return

1362

# Reschedule timeout

1363

gobject.source_remove(self.disable_initiator_tag)

1364

self.disable_initiator_tag = None

1365

self.expires = None

1366

time_to_die = timedelta_to_milliseconds((self

1367

.last_checked_ok

1368

+ self.timeout)

1369

- datetime.datetime

1370

.utcnow())

1371

if time_to_die <= 0:

1372

# The timeout has passed

1373

self.disable()

1374

else:

1375

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

1376

+ datetime.timedelta(milliseconds =

1377

time_to_die))

1378

self.disable_initiator_tag = (gobject.timeout_add

1379

(time_to_die, self.disable))

1601

# Reschedule disabling

1602

if self.enabled:

1603

now = datetime.datetime.utcnow()

1604

self.expires += self.timeout - old_timeout

1605

if self.expires <= now:

1606

# The timeout has passed

1607

self.disable()

1608

else:

1609

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

1610

is None):

1611

return

1612

gobject.source_remove(self.disable_initiator_tag)

1613

self.disable_initiator_tag = gobject.timeout_add(

1614

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

1615

self.disable)

1380

1616

1381

1617

# ExtendedTimeout - property

1382

@dbus_service_property(_interface, signature="t",

1618

@dbus_service_property(_interface,

1619

signature="t",

1383

1620

access="readwrite")

1384

1621

def ExtendedTimeout_dbus_property(self, value=None):

1385

1622

if value is None: # get

1386

return dbus.UInt64(self.extended_timeout_milliseconds())

1623

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

1624

* 1000)

1387

1625

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

1388

1626

1389

1627

# Interval - property

1390

@dbus_service_property(_interface, signature="t",

1628

@dbus_service_property(_interface,

1629

signature="t",

1391

1630

access="readwrite")

1392

1631

def Interval_dbus_property(self, value=None):

1393

1632

if value is None: # get

1394

return dbus.UInt64(self.interval_milliseconds())

1633

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

1395

1634

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

1396

1635

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

1397

1636

return

1398

1637

if self.enabled:

1399

1638

# Reschedule checker run

1400

1639

gobject.source_remove(self.checker_initiator_tag)

1401

self.checker_initiator_tag = (gobject.timeout_add

1402

(value, self.start_checker))

1403

self.start_checker() # Start one now, too

1640

self.checker_initiator_tag = gobject.timeout_add(

1641

value, self.start_checker)

1642

self.start_checker() # Start one now, too

1404

1643

1405

1644

# Checker - property

1406

@dbus_service_property(_interface, signature="s",

1645

@dbus_service_property(_interface,

1646

signature="s",

1407

1647

access="readwrite")

1408

1648

def Checker_dbus_property(self, value=None):

1409

1649

if value is None: # get

1410

1650

return dbus.String(self.checker_command)

1411

self.checker_command = unicode(value)

1651

self.checker_command = str(value)

1412

1652

1413

1653

# CheckerRunning - property

1414

@dbus_service_property(_interface, signature="b",

1654

@dbus_service_property(_interface,

1655

signature="b",

1415

1656

access="readwrite")

1416

1657

def CheckerRunning_dbus_property(self, value=None):

1417

1658

if value is None: # get

1427

1668

return self.dbus_object_path # is already a dbus.ObjectPath

1428

1669

1429

1670

# Secret = property

1430

@dbus_service_property(_interface, signature="ay",

1431

access="write", byte_arrays=True)

1671

@dbus_service_property(_interface,

1672

signature="ay",

1673

access="write",

1674

byte_arrays=True)

1432

1675

def Secret_dbus_property(self, value):

1433

self.secret = str(value)

1676

self.secret = bytes(value)

1434

1677

1435

1678

del _interface

1436

1679

1440

1683

self._pipe = child_pipe

1441

1684

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

1442

1685

if not self._pipe.recv():

1443

raise KeyError()

1686

raise KeyError(fpr)

1444

1687

1445

1688

def __getattribute__(self, name):

1446

1689

if name == '_pipe':

1450

1693

if data[0] == 'data':

1451

1694

return data[1]

1452

1695

if data[0] == 'function':

1696

1453

1697

def func(*args, **kwargs):

1454

1698

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

1455

1699

return self._pipe.recv()[1]

1700

1456

1701

return func

1457

1702

1458

1703

def __setattr__(self, name, value):

1461

1706

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

1462

1707

1463

1708

1464

class ClientDBusTransitional(ClientDBus):

1465

__metaclass__ = AlternateDBusNamesMetaclass

1466

1467

1468

1709

class ClientHandler(socketserver.BaseRequestHandler, object):

1469

1710

"""A class to handle client connections.

1470

1711

1474

1715

def handle(self):

1475

1716

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

1476

1717

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

1477

unicode(self.client_address))

1718

str(self.client_address))

1478

1719

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

1479

1720

self.server.child_pipe.fileno())

1480

1721

1481

session = (gnutls.connection

1482

.ClientSession(self.request,

1483

gnutls.connection

1484

.X509Credentials()))

1722

session = gnutls.connection.ClientSession(

1723

self.request, gnutls.connection .X509Credentials())

1485

1724

1486

1725

# Note: gnutls.connection.X509Credentials is really a

1487

1726

# generic GnuTLS certificate credentials object so long as

1496

1735

priority = self.server.gnutls_priority

1497

1736

if priority is None:

1498

1737

priority = "NORMAL"

1499

(gnutls.library.functions

1500

.gnutls_priority_set_direct(session._c_object,

1501

priority, None))

1738

gnutls.library.functions.gnutls_priority_set_direct(

1739

session._c_object, priority, None)

1502

1740

1503

1741

# Start communication using the Mandos protocol

1504

1742

# Get protocol number

1506

1744

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

1507

1745

try:

1508

1746

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

1509

raise RuntimeError

1747

raise RuntimeError(line)

1510

1748

except (ValueError, IndexError, RuntimeError) as error:

1511

1749

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

1512

1750

return

1524

1762

approval_required = False

1525

1763

try:

1526

1764

try:

1527

fpr = self.fingerprint(self.peer_certificate

1528

(session))

1765

fpr = self.fingerprint(

1766

self.peer_certificate(session))

1529

1767

except (TypeError,

1530

1768

gnutls.errors.GNUTLSError) as error:

1531

1769

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

1538

1776

except KeyError:

1539

1777

return

1540

1778

1541

if self.server.use_dbus:

1542

# Emit D-Bus signal

1543

client.NewRequest(str(self.client_address))

1544

1545

1779

if client.approval_delay:

1546

1780

delay = client.approval_delay

1547

1781

client.approvals_pending += 1

1550

1784

while True:

1551

1785

if not client.enabled:

1552

1786

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

1553

client.name)

1787

client.name)

1554

1788

if self.server.use_dbus:

1555

1789

# Emit D-Bus signal

1556

1790

client.Rejected("Disabled")

1565

1799

if self.server.use_dbus:

1566

1800

# Emit D-Bus signal

1567

1801

client.NeedApproval(

1568

client.approval_delay_milliseconds(),

1569

client.approved_by_default)

1802

client.approval_delay.total_seconds()

1803

* 1000, client.approved_by_default)

1570

1804

else:

1571

1805

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

1572

1806

client.name)

1578

1812

#wait until timeout or approved

1579

1813

time = datetime.datetime.now()

1580

1814

client.changedstate.acquire()

1581

(client.changedstate.wait

1582

(float(client.timedelta_to_milliseconds(delay)

1583

/ 1000)))

1815

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

1584

1816

client.changedstate.release()

1585

1817

time2 = datetime.datetime.now()

1586

1818

if (time2 - time) >= delay:

1602

1834

try:

1603

1835

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

1604

1836

except gnutls.errors.GNUTLSError as error:

1605

logger.warning("gnutls send failed")

1837

logger.warning("gnutls send failed",

1838

exc_info=error)

1606

1839

return

1607

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

1608

sent, len(client.secret)

1609

- (sent_size + sent))

1840

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

1841

len(client.secret) - (sent_size

1842

+ sent))

1610

1843

sent_size += sent

1611

1844

1612

1845

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

1613

1846

# bump the timeout using extended_timeout

1614

client.checked_ok(client.extended_timeout)

1847

client.bump_timeout(client.extended_timeout)

1615

1848

if self.server.use_dbus:

1616

1849

# Emit D-Bus signal

1617

1850

client.GotSecret()

1622

1855

try:

1623

1856

session.bye()

1624

1857

except gnutls.errors.GNUTLSError as error:

1625

logger.warning("GnuTLS bye failed")

1858

logger.warning("GnuTLS bye failed",

1859

exc_info=error)

1626

1860

1627

1861

@staticmethod

1628

1862

def peer_certificate(session):

1629

1863

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

1630

1864

# If not an OpenPGP certificate...

1631

if (gnutls.library.functions

1632

.gnutls_certificate_type_get(session._c_object)

1865

if (gnutls.library.functions.gnutls_certificate_type_get(

1866

session._c_object)

1633

1867

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

1634

1868

# ...do the normal thing

1635

1869

return session.peer_certificate

1649

1883

def fingerprint(openpgp):

1650

1884

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

1651

1885

# New GnuTLS "datum" with the OpenPGP public key

1652

datum = (gnutls.library.types

1653

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

1654

ctypes.POINTER

1655

(ctypes.c_ubyte)),

1656

ctypes.c_uint(len(openpgp))))

1886

datum = gnutls.library.types.gnutls_datum_t(

1887

ctypes.cast(ctypes.c_char_p(openpgp),

1888

ctypes.POINTER(ctypes.c_ubyte)),

1889

ctypes.c_uint(len(openpgp)))

1657

1890

# New empty GnuTLS certificate

1658

1891

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1659

(gnutls.library.functions

1660

.gnutls_openpgp_crt_init(ctypes.byref(crt)))

1892

gnutls.library.functions.gnutls_openpgp_crt_init(

1893

ctypes.byref(crt))

1661

1894

# Import the OpenPGP public key into the certificate

1662

(gnutls.library.functions

1663

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

1664

gnutls.library.constants

1665

.GNUTLS_OPENPGP_FMT_RAW))

1895

gnutls.library.functions.gnutls_openpgp_crt_import(

1896

crt, ctypes.byref(datum),

1897

gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)

1666

1898

# Verify the self signature in the key

1667

1899

crtverify = ctypes.c_uint()

1668

(gnutls.library.functions

1669

.gnutls_openpgp_crt_verify_self(crt, 0,

1670

ctypes.byref(crtverify)))

1900

gnutls.library.functions.gnutls_openpgp_crt_verify_self(

1901

crt, 0, ctypes.byref(crtverify))

1671

1902

if crtverify.value != 0:

1672

1903

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1673

raise (gnutls.errors.CertificateSecurityError

1674

("Verify failed"))

1904

raise gnutls.errors.CertificateSecurityError(

1905

"Verify failed")

1675

1906

# New buffer for the fingerprint

1676

1907

buf = ctypes.create_string_buffer(20)

1677

1908

buf_len = ctypes.c_size_t()

1678

1909

# Get the fingerprint from the certificate into the buffer

1679

(gnutls.library.functions

1680

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

1681

ctypes.byref(buf_len)))

1910

gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint(

1911

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

1682

1912

# Deinit the certificate

1683

1913

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1684

1914

# Convert the buffer to a Python bytestring

1690

1920

1691

1921

class MultiprocessingMixIn(object):

1692

1922

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

1923

1693

1924

def sub_process_main(self, request, address):

1694

1925

try:

1695

1926

self.finish_request(request, address)

1700

1931

def process_request(self, request, address):

1701

1932

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

1702

1933

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

1703

args = (request,

1704

address))

1934

args = (request, address))

1705

1935

proc.start()

1706

1936

return proc

1707

1937

1708

1938

1709

1939

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1710

1940

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

1941

1711

1942

def process_request(self, request, client_address):

1712

1943

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

1713

1944

1722

1953

1723

1954

def add_pipe(self, parent_pipe, proc):

1724

1955

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

1725

raise NotImplementedError

1956

raise NotImplementedError()

1726

1957

1727

1958

1728

1959

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1734

1965

interface: None or a network interface name (string)

1735

1966

use_ipv6: Boolean; to use IPv6 or not

1736

1967

"""

1968

1737

1969

def __init__(self, server_address, RequestHandlerClass,

1738

interface=None, use_ipv6=True):

1970

interface=None,

1971

use_ipv6=True,

1972

socketfd=None):

1973

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

1974

creating a new one with socket.socket().

1975

"""

1739

1976

self.interface = interface

1740

1977

if use_ipv6:

1741

1978

self.address_family = socket.AF_INET6

1979

if socketfd is not None:

1980

# Save the file descriptor

1981

self.socketfd = socketfd

1982

# Save the original socket.socket() function

1983

self.socket_socket = socket.socket

1984

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

1985

#

1986

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

1987

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

1988

# patching socket.socket.)

1989

#

1990

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

1991

@functools.wraps(socket.socket)

1992

def socket_wrapper(*args, **kwargs):

1993

# Restore original function so subsequent calls are

1994

# not affected.

1995

socket.socket = self.socket_socket

1996

del self.socket_socket

1997

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

1998

# saved file descriptor.

1999

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

2000

# Replace socket.socket() function with wrapper

2001

socket.socket = socket_wrapper

2002

# The socketserver.TCPServer.__init__ will call

2003

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

2004

# socket_wrapper(), if socketfd was set.

1742

2005

socketserver.TCPServer.__init__(self, server_address,

1743

2006

RequestHandlerClass)

2007

1744

2008

def server_bind(self):

1745

2009

"""This overrides the normal server_bind() function

1746

2010

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

1752

2016

self.interface)

1753

2017

else:

1754

2018

try:

1755

self.socket.setsockopt(socket.SOL_SOCKET,

1756

SO_BINDTODEVICE,

1757

str(self.interface

1758

+ '\0'))

2019

self.socket.setsockopt(

2020

socket.SOL_SOCKET, SO_BINDTODEVICE,

2021

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

1759

2022

except socket.error as error:

1760

if error[0] == errno.EPERM:

1761

logger.error("No permission to"

1762

" bind to interface %s",

1763

self.interface)

1764

elif error[0] == errno.ENOPROTOOPT:

2023

if error.errno == errno.EPERM:

2024

logger.error("No permission to bind to"

2025

" interface %s", self.interface)

2026

elif error.errno == errno.ENOPROTOOPT:

1765

2027

logger.error("SO_BINDTODEVICE not available;"

1766

2028

" cannot bind to interface %s",

1767

2029

self.interface)

2030

elif error.errno == errno.ENODEV:

2031

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

2032

" cannot bind", self.interface)

1768

2033

else:

1769

2034

raise

1770

2035

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

1773

2038

if self.address_family == socket.AF_INET6:

1774

2039

any_address = "::" # in6addr_any

1775

2040

else:

1776

any_address = socket.INADDR_ANY

2041

any_address = "0.0.0.0" # INADDR_ANY

1777

2042

self.server_address = (any_address,

1778

2043

self.server_address[1])

1779

2044

elif not self.server_address[1]:

1780

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

1781

0)

2045

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

1782

2046

# if self.interface:

1783

2047

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

1784

2048

# 0, # port

1798

2062

1799

2063

Assumes a gobject.MainLoop event loop.

1800

2064

"""

2065

1801

2066

def __init__(self, server_address, RequestHandlerClass,

1802

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

1803

gnutls_priority=None, use_dbus=True):

2067

interface=None,

2068

use_ipv6=True,

2069

clients=None,

2070

gnutls_priority=None,

2071

use_dbus=True,

2072

socketfd=None):

1804

2073

self.enabled = False

1805

2074

self.clients = clients

1806

2075

if self.clients is None:

1810

2079

IPv6_TCPServer.__init__(self, server_address,

1811

2080

RequestHandlerClass,

1812

2081

interface = interface,

1813

use_ipv6 = use_ipv6)

2082

use_ipv6 = use_ipv6,

2083

socketfd = socketfd)

2084

1814

2085

def server_activate(self):

1815

2086

if self.enabled:

1816

2087

return socketserver.TCPServer.server_activate(self)

1820

2091

1821

2092

def add_pipe(self, parent_pipe, proc):

1822

2093

# Call "handle_ipc" for both data and EOF events

1823

gobject.io_add_watch(parent_pipe.fileno(),

1824

gobject.IO_IN | gobject.IO_HUP,

1825

functools.partial(self.handle_ipc,

1826

parent_pipe =

1827

parent_pipe,

1828

proc = proc))

2094

gobject.io_add_watch(

2095

parent_pipe.fileno(),

2096

gobject.IO_IN | gobject.IO_HUP,

2097

functools.partial(self.handle_ipc,

2098

parent_pipe = parent_pipe,

2099

proc = proc))

1829

2100

1830

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

1831

proc = None, client_object=None):

1832

condition_names = {

1833

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

1834

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

1835

# blocking).

1836

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

1837

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

1838

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

1839

# broken, usually for pipes and

1840

# sockets).

1841

}

1842

conditions_string = ' | '.join(name

1843

for cond, name in

1844

condition_names.iteritems()

1845

if cond & condition)

2101

def handle_ipc(self, source, condition,

2102

parent_pipe=None,

2103

proc = None,

2104

client_object=None):

1846

2105

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

1847

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

2106

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

1848

2107

# Wait for other process to exit

1849

2108

proc.join()

1850

2109

return False

1871

2130

parent_pipe.send(False)

1872

2131

return False

1873

2132

1874

gobject.io_add_watch(parent_pipe.fileno(),

1875

gobject.IO_IN | gobject.IO_HUP,

1876

functools.partial(self.handle_ipc,

1877

parent_pipe =

1878

parent_pipe,

1879

proc = proc,

1880

client_object =

1881

client))

2133

gobject.io_add_watch(

2134

parent_pipe.fileno(),

2135

gobject.IO_IN | gobject.IO_HUP,

2136

functools.partial(self.handle_ipc,

2137

parent_pipe = parent_pipe,

2138

proc = proc,

2139

client_object = client))

1882

2140

parent_pipe.send(True)

1883

2141

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

1884

2142

# same fileno

1890

2148

1891

2149

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

1892

2150

funcname)(*args,

1893

**kwargs)))

2151

**kwargs)))

1894

2152

1895

2153

if command == 'getattr':

1896

2154

attrname = request[1]

1897

if callable(client_object.__getattribute__(attrname)):

1898

parent_pipe.send(('function',))

2155

if isinstance(client_object.__getattribute__(attrname),

2156

collections.Callable):

2157

parent_pipe.send(('function', ))

1899

2158

else:

1900

parent_pipe.send(('data', client_object

1901

.__getattribute__(attrname)))

2159

parent_pipe.send((

2160

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

1902

2161

1903

2162

if command == 'setattr':

1904

2163

attrname = request[1]

1908

2167

return True

1909

2168

1910

2169

2170

def rfc3339_duration_to_delta(duration):

2171

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

2172

2173

>>> rfc3339_duration_to_delta("P7D")

2174

datetime.timedelta(7)

2175

>>> rfc3339_duration_to_delta("PT60S")

2176

datetime.timedelta(0, 60)

2177

>>> rfc3339_duration_to_delta("PT60M")

2178

datetime.timedelta(0, 3600)

2179

>>> rfc3339_duration_to_delta("PT24H")

2180

datetime.timedelta(1)

2181

>>> rfc3339_duration_to_delta("P1W")

2182

datetime.timedelta(7)

2183

>>> rfc3339_duration_to_delta("PT5M30S")

2184

datetime.timedelta(0, 330)

2185

>>> rfc3339_duration_to_delta("P1DT3M20S")

2186

datetime.timedelta(1, 200)

2187

"""

2188

2189

# Parsing an RFC 3339 duration with regular expressions is not

2190

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

2191

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

2192

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

2193

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

2194

# avoid excessive use of external libraries.

2195

2196

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

2197

Token = collections.namedtuple("Token", (

2198

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

2199

# a "group" containing digits

2200

"value", # datetime.timedelta or None

2201

"followers")) # Tokens valid after this token

2202

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

2203

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

2204

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

2205

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

2206

datetime.timedelta(seconds=1),

2207

frozenset((token_end, )))

2208

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

2209

datetime.timedelta(minutes=1),

2210

frozenset((token_second, token_end)))

2211

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

2212

datetime.timedelta(hours=1),

2213

frozenset((token_minute, token_end)))

2214

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

2215

None,

2216

frozenset((token_hour, token_minute,

2217

token_second)))

2218

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

2219

datetime.timedelta(days=1),

2220

frozenset((token_time, token_end)))

2221

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

2222

datetime.timedelta(weeks=4),

2223

frozenset((token_day, token_end)))

2224

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

2225

datetime.timedelta(weeks=52),

2226

frozenset((token_month, token_end)))

2227

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

2228

datetime.timedelta(weeks=1),

2229

frozenset((token_end, )))

2230

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

2231

frozenset((token_year, token_month,

2232

token_day, token_time,

2233

token_week)))

2234

# Define starting values

2235

value = datetime.timedelta() # Value so far

2236

found_token = None

2237

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

2238

s = duration # String left to parse

2239

# Loop until end token is found

2240

while found_token is not token_end:

2241

# Search for any currently valid tokens

2242

for token in followers:

2243

match = token.regexp.match(s)

2244

if match is not None:

2245

# Token found

2246

if token.value is not None:

2247

# Value found, parse digits

2248

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

2249

# Add to value so far

2250

value += factor * token.value

2251

# Strip token from string

2252

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

2253

# Go to found token

2254

found_token = token

2255

# Set valid next tokens

2256

followers = found_token.followers

2257

break

2258

else:

2259

# No currently valid tokens were found

2260

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

2261

.format(duration))

2262

# End token found

2263

return value

2264

2265

1911

2266

def string_to_delta(interval):

1912

2267

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

1913

2268

1924

2279

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

1925

2280

datetime.timedelta(0, 330)

1926

2281

"""

2282

2283

try:

2284

return rfc3339_duration_to_delta(interval)

2285

except ValueError:

2286

pass

2287

1927

2288

timevalue = datetime.timedelta(0)

1928

2289

for s in interval.split():

1929

2290

try:

1930

suffix = unicode(s[-1])

2291

suffix = s[-1]

1931

2292

value = int(s[:-1])

1932

2293

if suffix == "d":

1933

2294

delta = datetime.timedelta(value)

1940

2301

elif suffix == "w":

1941

2302

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

1942

2303

else:

1943

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

1944

except (ValueError, IndexError) as e:

2304

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

2305

except IndexError as e:

1945

2306

raise ValueError(*(e.args))

1946

2307

timevalue += delta

1947

2308

return timevalue

1960

2321

sys.exit()

1961

2322

if not noclose:

1962

2323

# Close all standard open file descriptors

1963

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

2324

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

1964

2325

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

1965

2326

raise OSError(errno.ENODEV,

1966

"%s not a character device"

1967

% os.path.devnull)

2327

"{} not a character device"

2328

.format(os.devnull))

1968

2329

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

1969

2330

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

1970

2331

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

1979

2340

1980

2341

parser = argparse.ArgumentParser()

1981

2342

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

1982

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

2343

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

1983

2344

help="show version number and exit")

1984

2345

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

1985

2346

help="Bind to interface IF")

1991

2352

help="Run self-test")

1992

2353

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

1993

2354

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

1994

" to terminal")

2355

" to terminal", default=None)

1995

2356

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

1996

2357

help="Debug level for stdout output")

1997

2358

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

2004

2365

" files")

2005

2366

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

2006

2367

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

2007

" system bus interface")

2368

" system bus interface", default=None)

2008

2369

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

2009

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

2370

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

2371

default=None)

2010

2372

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

2011

2373

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

2012

" state")

2374

" state", default=None)

2375

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

2376

help="Specify a file descriptor to a network"

2377

" socket to use instead of creating one")

2013

2378

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

2014

2379

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

2380

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

2381

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

2382

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

2383

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

2384

default=None)

2015

2385

2016

2386

options = parser.parse_args()

2017

2387

2018

2388

if options.check:

2019

2389

import doctest

2020

doctest.testmod()

2021

sys.exit()

2390

fail_count, test_count = doctest.testmod()

2391

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

2022

2392

2023

2393

# Default values for config file for server-global settings

2024

2394

server_defaults = { "interface": "",

2026

2396

"port": "",

2027

2397

"debug": "False",

2028

2398

"priority":

2029

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

2399

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

2400

":+SIGN-RSA-SHA224:+SIGN-RSA-RMD160",

2030

2401

"servicename": "Mandos",

2031

2402

"use_dbus": "True",

2032

2403

"use_ipv6": "True",

2033

2404

"debuglevel": "",

2034

2405

"restore": "True",

2035

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

2036

}

2406

"socket": "",

2407

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

2408

"foreground": "False",

2409

"zeroconf": "True",

2410

}

2037

2411

2038

2412

# Parse config file for server-global settings

2039

2413

server_config = configparser.SafeConfigParser(server_defaults)

2040

2414

del server_defaults

2041

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

2042

"mandos.conf"))

2415

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

2043

2416

# Convert the SafeConfigParser object to a dict

2044

2417

server_settings = server_config.defaults()

2045

2418

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

2046

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

2419

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

2047

2420

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

2048

2421

option)

2049

2422

if server_settings["port"]:

2050

2423

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

2051

2424

"port")

2425

if server_settings["socket"]:

2426

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

2427

"socket")

2428

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

2429

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

2430

# happen with a supplied network socket.

2431

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

2432

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

2433

["socket"])

2052

2434

del server_config

2053

2435

2054

2436

# Override the settings from the config file with command line

2055

2437

# options, if set.

2056

2438

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

2057

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

2058

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

2059

"statedir"):

2439

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

2440

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

2441

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

2060

2442

value = getattr(options, option)

2061

2443

if value is not None:

2062

2444

server_settings[option] = value

2063

2445

del options

2064

2446

# Force all strings to be unicode

2065

2447

for option in server_settings.keys():

2066

if type(server_settings[option]) is str:

2067

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

2448

if isinstance(server_settings[option], bytes):

2449

server_settings[option] = (server_settings[option]

2450

.decode("utf-8"))

2451

# Force all boolean options to be boolean

2452

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

2453

"foreground", "zeroconf"):

2454

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

2455

# Debug implies foreground

2456

if server_settings["debug"]:

2457

server_settings["foreground"] = True

2068

2458

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

2069

2459

2070

2460

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

2071

2461

2462

if (not server_settings["zeroconf"]

2463

and not (server_settings["port"]

2464

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

2465

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

2466

2072

2467

# For convenience

2073

2468

debug = server_settings["debug"]

2074

2469

debuglevel = server_settings["debuglevel"]

2076

2471

use_ipv6 = server_settings["use_ipv6"]

2077

2472

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

2078

2473

stored_state_file)

2474

foreground = server_settings["foreground"]

2475

zeroconf = server_settings["zeroconf"]

2079

2476

2080

2477

if debug:

2081

initlogger(logging.DEBUG)

2478

initlogger(debug, logging.DEBUG)

2082

2479

else:

2083

2480

if not debuglevel:

2084

initlogger()

2481

initlogger(debug)

2085

2482

else:

2086

2483

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

2087

initlogger(level)

2484

initlogger(debug, level)

2088

2485

2089

2486

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

2090

syslogger.setFormatter(logging.Formatter

2091

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

2092

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

2093

% server_settings["servicename"]))

2487

syslogger.setFormatter(

2488

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

2489

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

2490

server_settings["servicename"])))

2094

2491

2095

2492

# Parse config file with clients

2096

client_config = configparser.SafeConfigParser(Client.client_defaults)

2493

client_config = configparser.SafeConfigParser(Client

2494

.client_defaults)

2097

2495

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

2098

2496

"clients.conf"))

2099

2497

2100

2498

global mandos_dbus_service

2101

2499

mandos_dbus_service = None

2102

2500

2103

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

2104

server_settings["port"]),

2105

ClientHandler,

2106

interface=(server_settings["interface"]

2107

or None),

2108

use_ipv6=use_ipv6,

2109

gnutls_priority=

2110

server_settings["priority"],

2111

use_dbus=use_dbus)

2112

if not debug:

2113

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

2501

socketfd = None

2502

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

2503

socketfd = server_settings["socket"]

2504

tcp_server = MandosServer(

2505

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

2506

ClientHandler,

2507

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

2508

use_ipv6=use_ipv6,

2509

gnutls_priority=server_settings["priority"],

2510

use_dbus=use_dbus,

2511

socketfd=socketfd)

2512

if not foreground:

2513

pidfilename = "/run/mandos.pid"

2514

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

2515

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

2516

pidfile = None

2114

2517

try:

2115

pidfile = open(pidfilename, "w")

2116

except IOError:

2117

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

2518

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

2519

except IOError as e:

2520

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

2521

exc_info=e)

2118

2522

2119

try:

2120

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

2121

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

2122

except KeyError:

2523

for name in ("_mandos", "mandos", "nobody"):

2123

2524

try:

2124

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

2125

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

2525

uid = pwd.getpwnam(name).pw_uid

2526

gid = pwd.getpwnam(name).pw_gid

2527

break

2126

2528

except KeyError:

2127

try:

2128

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

2129

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

2130

except KeyError:

2131

uid = 65534

2132

gid = 65534

2529

continue

2530

else:

2531

uid = 65534

2532

gid = 65534

2133

2533

try:

2134

2534

os.setgid(gid)

2135

2535

os.setuid(uid)

2136

2536

except OSError as error:

2137

if error[0] != errno.EPERM:

2138

raise error

2537

if error.errno != errno.EPERM:

2538

raise

2139

2539

2140

2540

if debug:

2141

2541

# Enable all possible GnuTLS debugging

2148

2548

def debug_gnutls(level, string):

2149

2549

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

2150

2550

2151

(gnutls.library.functions

2152

.gnutls_global_set_log_function(debug_gnutls))

2551

gnutls.library.functions.gnutls_global_set_log_function(

2552

debug_gnutls)

2153

2553

2154

2554

# Redirect stdin so all checkers get /dev/null

2155

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

2555

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

2156

2556

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

2157

2557

if null > 2:

2158

2558

os.close(null)

2159

else:

2160

# No console logging

2161

logger.removeHandler(console)

2162

2559

2163

2560

# Need to fork before connecting to D-Bus

2164

if not debug:

2561

if not foreground:

2165

2562

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

2166

2563

daemon()

2167

2564

2565

# multiprocessing will use threads, so before we use gobject we

2566

# need to inform gobject that threads will be used.

2168

2567

gobject.threads_init()

2169

2568

2170

2569

global main_loop

2171

2570

# From the Avahi example code

2172

DBusGMainLoop(set_as_default=True )

2571

DBusGMainLoop(set_as_default=True)

2173

2572

main_loop = gobject.MainLoop()

2174

2573

bus = dbus.SystemBus()

2175

2574

# End of Avahi example code

2176

2575

if use_dbus:

2177

2576

try:

2178

2577

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

2179

bus, do_not_queue=True)

2180

old_bus_name = (dbus.service.BusName

2181

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

2182

do_not_queue=True))

2183

except dbus.exceptions.NameExistsException as e:

2184

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

2578

bus,

2579

do_not_queue=True)

2580

old_bus_name = dbus.service.BusName(

2581

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

2582

do_not_queue=True)

2583

except dbus.exceptions.DBusException as e:

2584

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

2185

2585

use_dbus = False

2186

2586

server_settings["use_dbus"] = False

2187

2587

tcp_server.use_dbus = False

2188

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2189

service = AvahiServiceToSyslog(name =

2190

server_settings["servicename"],

2191

servicetype = "_mandos._tcp",

2192

protocol = protocol, bus = bus)

2193

if server_settings["interface"]:

2194

service.interface = (if_nametoindex

2195

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

2588

if zeroconf:

2589

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2590

service = AvahiServiceToSyslog(

2591

name = server_settings["servicename"],

2592

servicetype = "_mandos._tcp",

2593

protocol = protocol,

2594

bus = bus)

2595

if server_settings["interface"]:

2596

service.interface = if_nametoindex(

2597

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

2196

2598

2197

2599

global multiprocessing_manager

2198

2600

multiprocessing_manager = multiprocessing.Manager()

2199

2601

2200

2602

client_class = Client

2201

2603

if use_dbus:

2202

client_class = functools.partial(ClientDBusTransitional,

2203

bus = bus)

2604

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

2204

2605

2205

2606

client_settings = Client.config_parser(client_config)

2206

2607

old_client_settings = {}

2207

2608

clients_data = {}

2208

2609

2610

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

2611

global wnull

2612

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

2613

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

2614

# mode

2615

if debug or not foreground:

2616

wnull.close()

2617

2209

2618

# Get client data and settings from last running state.

2210

2619

if server_settings["restore"]:

2211

2620

try:

2212

2621

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

2213

clients_data, old_client_settings = (pickle.load

2214

(stored_state))

2622

clients_data, old_client_settings = pickle.load(

2623

stored_state)

2215

2624

os.remove(stored_state_path)

2216

2625

except IOError as e:

2217

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

2218

.format(e))

2219

if e.errno != errno.ENOENT:

2626

if e.errno == errno.ENOENT:

2627

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

2628

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

2629

else:

2630

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

2631

exc_info=e)

2220

2632

raise

2221

2633

except EOFError as e:

2222

2634

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

2223

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

2635

"EOFError:",

2636

exc_info=e)

2224

2637

2225

2638

with PGPEngine() as pgp:

2226

for client_name, client in clients_data.iteritems():

2639

for client_name, client in clients_data.items():

2640

# Skip removed clients

2641

if client_name not in client_settings:

2642

continue

2643

2227

2644

# Decide which value to use after restoring saved state.

2228

2645

# We have three different values: Old config file,

2229

2646

# new config file, and saved state.

2234

2651

# For each value in new config, check if it

2235

2652

# differs from the old config value (Except for

2236

2653

# the "secret" attribute)

2237

if (name != "secret" and

2238

value != old_client_settings[client_name]

2239

[name]):

2654

if (name != "secret"

2655

and (value !=

2656

old_client_settings[client_name][name])):

2240

2657

client[name] = value

2241

2658

except KeyError:

2242

2659

pass

2243

2660

2244

2661

# Clients who has passed its expire date can still be

2245

# enabled if its last checker was successful. Clients

2246

# whose checker failed before we stored its state is

2247

# assumed to have failed all checkers during downtime.

2662

# enabled if its last checker was successful. A Client

2663

# whose checker succeeded before we stored its state is

2664

# assumed to have successfully run all checkers during

2665

# downtime.

2248

2666

if client["enabled"]:

2249

2667

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

2250

2668

if not client["last_checked_ok"]:

2251

2669

logger.warning(

2252

"disabling client {0} - Client never "

2253

"performed a successfull checker"

2254

.format(client["name"]))

2670

"disabling client {} - Client never "

2671

"performed a successful checker".format(

2672

client_name))

2255

2673

client["enabled"] = False

2256

2674

elif client["last_checker_status"] != 0:

2257

2675

logger.warning(

2258

"disabling client {0} - Client "

2259

"last checker failed with error code {1}"

2260

.format(client["name"],

2261

client["last_checker_status"]))

2676

"disabling client {} - Client last"

2677

" checker failed with error code"

2678

" {}".format(

2679

client_name,

2680

client["last_checker_status"]))

2262

2681

client["enabled"] = False

2263

2682

else:

2264

client["expires"] = (datetime.datetime

2265

.utcnow()

2266

+ client["timeout"])

2267

2683

client["expires"] = (

2684

datetime.datetime.utcnow()

2685

+ client["timeout"])

2686

logger.debug("Last checker succeeded,"

2687

" keeping {} enabled".format(

2688

client_name))

2268

2689

try:

2269

client["secret"] = (

2270

pgp.decrypt(client["encrypted_secret"],

2271

client_settings[client_name]

2272

["secret"]))

2690

client["secret"] = pgp.decrypt(

2691

client["encrypted_secret"],

2692

client_settings[client_name]["secret"])

2273

2693

except PGPError:

2274

2694

# If decryption fails, we use secret from new settings

2275

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

2276

.format(client_name))

2277

client["secret"] = (

2278

client_settings[client_name]["secret"])

2279

2695

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

2696

client_name))

2697

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

2698

["secret"])

2280

2699

2281

2700

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

2282

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

2701

for client_name in (set(old_client_settings)

2702

- set(client_settings)):

2283

2703

del clients_data[client_name]

2284

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

2704

for client_name in (set(client_settings)

2705

- set(old_client_settings)):

2285

2706

clients_data[client_name] = client_settings[client_name]

2286

2287

# Create clients all clients

2288

for client_name, client in clients_data.iteritems():

2707

2708

# Create all client objects

2709

for client_name, client in clients_data.items():

2289

2710

tcp_server.clients[client_name] = client_class(

2290

name = client_name, settings = client)

2711

name = client_name,

2712

settings = client,

2713

server_settings = server_settings)

2291

2714

2292

2715

if not tcp_server.clients:

2293

2716

logger.warning("No clients defined")

2294

2295

if not debug:

2296

try:

2297

with pidfile:

2298

pid = os.getpid()

2299

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

2300

del pidfile

2301

except IOError:

2302

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

2303

pidfilename, pid)

2304

except NameError:

2305

# "pidfile" was never created

2306

pass

2717

2718

if not foreground:

2719

if pidfile is not None:

2720

pid = os.getpid()

2721

try:

2722

with pidfile:

2723

print(pid, file=pidfile)

2724

except IOError:

2725

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

2726

pidfilename, pid)

2727

del pidfile

2307

2728

del pidfilename

2308

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

2309

2729

2310

2730

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

2311

2731

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

2312

2732

2313

2733

if use_dbus:

2314

class MandosDBusService(dbus.service.Object):

2734

2735

@alternate_dbus_interfaces(

2736

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

2737

class MandosDBusService(DBusObjectWithProperties):

2315

2738

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

2739

2316

2740

def __init__(self):

2317

2741

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

2742

2318

2743

_interface = "se.recompile.Mandos"

2319

2744

2745

@dbus_interface_annotations(_interface)

2746

def _foo(self):

2747

return {

2748

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

2749

"false" }

2750

2320

2751

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

2321

2752

def ClientAdded(self, objpath):

2322

2753

"D-Bus signal"

2335

2766

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

2336

2767

def GetAllClients(self):

2337

2768

"D-Bus method"

2338

return dbus.Array(c.dbus_object_path

2339

for c in

2769

return dbus.Array(c.dbus_object_path for c in

2340

2770

tcp_server.clients.itervalues())

2341

2771

2342

2772

@dbus.service.method(_interface,

2344

2774

def GetAllClientsWithProperties(self):

2345

2775

"D-Bus method"

2346

2776

return dbus.Dictionary(

2347

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

2348

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

2777

{ c.dbus_object_path: c.GetAll("")

2778

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

2349

2779

signature="oa{sv}")

2350

2780

2351

2781

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

2364

2794

2365

2795

del _interface

2366

2796

2367

class MandosDBusServiceTransitional(MandosDBusService):

2368

__metaclass__ = AlternateDBusNamesMetaclass

2369

mandos_dbus_service = MandosDBusServiceTransitional()

2797

mandos_dbus_service = MandosDBusService()

2370

2798

2371

2799

def cleanup():

2372

2800

"Cleanup function; run on exit"

2373

service.cleanup()

2801

if zeroconf:

2802

service.cleanup()

2374

2803

2375

2804

multiprocessing.active_children()

2805

wnull.close()

2376

2806

if not (tcp_server.clients or client_settings):

2377

2807

return

2378

2808

2389

2819

2390

2820

# A list of attributes that can not be pickled

2391

2821

# + secret.

2392

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

2393

"checker"))

2394

for name, typ in (inspect.getmembers

2395

(dbus.service.Object)):

2822

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

2823

"checker", "server_settings" }

2824

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

2825

.Object):

2396

2826

exclude.add(name)

2397

2827

2398

2828

client_dict["encrypted_secret"] = (client

2405

2835

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

2406

2836

2407

2837

try:

2408

with os.fdopen(os.open(stored_state_path,

2409

(os.O_CREAT | os.O_WRONLY

2410

| os.O_TRUNC | os.O_EXCL),

2411

(stat.S_IREAD | stat.S_IWRITE)),

2412

"wb") as stored_state:

2838

with tempfile.NamedTemporaryFile(

2839

mode='wb',

2840

suffix=".pickle",

2841

prefix='clients-',

2842

dir=os.path.dirname(stored_state_path),

2843

delete=False) as stored_state:

2413

2844

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

2845

tempname = stored_state.name

2846

os.rename(tempname, stored_state_path)

2414

2847

except (IOError, OSError) as e:

2415

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

2416

.format(e))

2417

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

2418

errno.EEXIST)):

2848

if not debug:

2849

try:

2850

os.remove(tempname)

2851

except NameError:

2852

pass

2853

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

2854

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

2855

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

2856

else:

2857

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

2858

exc_info=e)

2419

2859

raise

2420

2860

2421

2861

# Delete all clients, and settings from config

2427

2867

client.disable(quiet=True)

2428

2868

if use_dbus:

2429

2869

# Emit D-Bus signal

2430

mandos_dbus_service.ClientRemoved(client

2431

.dbus_object_path,

2432

client.name)

2870

mandos_dbus_service.ClientRemoved(

2871

client.dbus_object_path, client.name)

2433

2872

client_settings.clear()

2434

2873

2435

2874

atexit.register(cleanup)

2446

2885

tcp_server.server_activate()

2447

2886

2448

2887

# Find out what port we got

2449

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

2888

if zeroconf:

2889

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

2450

2890

if use_ipv6:

2451

2891

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

2452

" flowinfo %d, scope_id %d"

2453

% tcp_server.socket.getsockname())

2892

" flowinfo %d, scope_id %d",

2893

*tcp_server.socket.getsockname())

2454

2894

else: # IPv4

2455

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

2456

% tcp_server.socket.getsockname())

2895

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

2896

*tcp_server.socket.getsockname())

2457

2897

2458

2898

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

2459

2899

2460

2900

try:

2461

# From the Avahi example code

2462

try:

2463

service.activate()

2464

except dbus.exceptions.DBusException as error:

2465

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

2466

cleanup()

2467

sys.exit(1)

2468

# End of Avahi example code

2901

if zeroconf:

2902

# From the Avahi example code

2903

try:

2904

service.activate()

2905

except dbus.exceptions.DBusException as error:

2906

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

2907

cleanup()

2908

sys.exit(1)

2909

# End of Avahi example code

2469

2910

2470

2911

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

2471

2912

lambda *args, **kwargs:

2475

2916

logger.debug("Starting main loop")

2476

2917

main_loop.run()

2477

2918

except AvahiError as error:

2478

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

2919

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

2479

2920

cleanup()

2480

2921

sys.exit(1)

2481

2922

except KeyboardInterrupt:

2486

2927

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

2487

2928

cleanup()

2488

2929

2930

2489

2931

if __name__ == '__main__':

2490

2932

main()