/mandos/release : revision 237.7.72

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

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#

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# Everything else is

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#

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

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

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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try:

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from future_builtins import *

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except ImportError:

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pass

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try:

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import SocketServer as socketserver

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except ImportError:

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import socketserver

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import SocketServer as socketserver

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import socket

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import argparse

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import datetime

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import errno

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try:

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import ConfigParser as configparser

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except ImportError:

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import configparser

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import gnutls.crypto

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import gnutls.connection

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import gnutls.errors

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import gnutls.library.functions

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import gnutls.library.constants

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import gnutls.library.types

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import ConfigParser as configparser

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import sys

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import re

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import os

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import struct

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import fcntl

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import functools

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try:

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import cPickle as pickle

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except ImportError:

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import pickle

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import cPickle as pickle

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import multiprocessing

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import types

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import binascii

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import tempfile

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import itertools

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import collections

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import codecs

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import dbus

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import dbus.service

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from gi.repository import GLib

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import gobject

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import avahi

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from dbus.mainloop.glib import DBusGMainLoop

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import ctypes

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import ctypes.util

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import xml.dom.minidom

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import inspect

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import GnuPGInterface

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try:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except ImportError:

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SO_BINDTODEVICE = None

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if sys.version_info.major == 2:

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str = unicode

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version = "1.7.5"

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version = "1.4.1"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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syslogger = None

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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try:

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if_nametoindex = ctypes.cdll.LoadLibrary(

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

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if_nametoindex = (ctypes.cdll.LoadLibrary

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

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.if_nametoindex)

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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

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

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

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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

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

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

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interface))

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

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ifreq[16:20])[0]

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return interface_index

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def copy_function(func):

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

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if sys.version_info.major == 2:

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return types.FunctionType(func.func_code,

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func.func_globals,

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func.func_name,

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func.func_defaults,

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func.func_closure)

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else:

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return types.FunctionType(func.__code__,

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func.__globals__,

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func.__name__,

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func.__defaults__,

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func.__closure__)

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

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def initlogger(level=logging.WARNING):

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"""init logger and add loglevel"""

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global syslogger

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syslogger = (logging.handlers.SysLogHandler(

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facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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address = "/dev/log"))

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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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.gpg = "gpg"

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try:

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

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for line in output.splitlines():

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

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if name == "gpg":

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self.gpg = path

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break

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except OSError as e:

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if e.errno != errno.ENOENT:

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raise

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self.gnupgargs = ['--batch',

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'--homedir', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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

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'--quiet'])

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def __enter__(self):

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return self

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

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

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self._cleanup()

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return False

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def password_encode(self, password):

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

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

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

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if len(encoded) > 2048:

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

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

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

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

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return encoded

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

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def encrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(

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dir=self.tempdir) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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

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with open(os.devnull) as devnull:

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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ciphertext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(

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dir = self.tempdir) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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

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with open(os.devnull) as devnull:

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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decrypted_plaintext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return decrypted_plaintext

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# Pretend that we have an Avahi module

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class Avahi(object):

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

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

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

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

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PROTO_INET = 0 # avahi-common/address.h

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PROTO_INET6 = 1 # avahi-common/address.h

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DBUS_NAME = "org.freedesktop.Avahi"

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DBUS_INTERFACE_ENTRY_GROUP = DBUS_NAME + ".EntryGroup"

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DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"

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DBUS_PATH_SERVER = "/"

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def string_array_to_txt_array(self, t):

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

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

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ENTRY_GROUP_ESTABLISHED = 2 # avahi-common/defs.h

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ENTRY_GROUP_COLLISION = 3 # avahi-common/defs.h

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ENTRY_GROUP_FAILURE = 4 # avahi-common/defs.h

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SERVER_INVALID = 0 # avahi-common/defs.h

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SERVER_REGISTERING = 1 # avahi-common/defs.h

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SERVER_RUNNING = 2 # avahi-common/defs.h

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SERVER_COLLISION = 3 # avahi-common/defs.h

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SERVER_FAILURE = 4 # avahi-common/defs.h

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avahi = Avahi()

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class AvahiError(Exception):

282

211

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

283

212

self.value = value

284

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

285

**kwargs)

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

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def __unicode__(self):

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return unicode(repr(self.value))

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class AvahiServiceError(AvahiError):

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pass

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class AvahiGroupError(AvahiError):

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pass

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222

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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def __init__(self,

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interface = avahi.IF_UNSPEC,

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name = None,

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servicetype = None,

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port = None,

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TXT = None,

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domain = "",

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host = "",

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max_renames = 32768,

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protocol = avahi.PROTO_UNSPEC,

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bus = None):

244

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,

247

protocol = avahi.PROTO_UNSPEC, bus = None):

328

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self.interface = interface

329

249

self.name = name

330

250

self.type = servicetype

339

259

self.server = None

340

260

self.bus = bus

341

261

self.entry_group_state_changed_match = None

342

343

def rename(self, remove=True):

262

def rename(self):

344

263

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

345

264

if self.rename_count >= self.max_renames:

346

265

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

347

266

" after %i retries, exiting.",

348

267

self.rename_count)

349

268

raise AvahiServiceError("Too many renames")

350

self.name = str(

351

self.server.GetAlternativeServiceName(self.name))

352

self.rename_count += 1

269

self.name = unicode(self.server

270

.GetAlternativeServiceName(self.name))

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

354

272

self.name)

355

if remove:

356

self.remove()

273

self.remove()

357

274

try:

358

275

self.add()

359

276

except dbus.exceptions.DBusException as error:

360

if (error.get_dbus_name()

361

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

362

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

363

return self.rename(remove=False)

364

else:

365

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

366

self.cleanup()

367

os._exit(1)

368

277

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

278

self.cleanup()

279

os._exit(1)

280

self.rename_count += 1

369

281

def remove(self):

370

282

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

371

283

if self.entry_group_state_changed_match is not None:

373

285

self.entry_group_state_changed_match = None

374

286

if self.group is not None:

375

287

self.group.Reset()

376

377

288

def add(self):

378

289

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

379

290

self.remove()

396

307

dbus.UInt16(self.port),

397

308

avahi.string_array_to_txt_array(self.TXT))

398

309

self.group.Commit()

399

400

310

def entry_group_state_changed(self, state, error):

401

311

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

402

312

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

408

318

self.rename()

409

319

elif state == avahi.ENTRY_GROUP_FAILURE:

410

320

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

411

str(error))

412

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

413

321

unicode(error))

322

raise AvahiGroupError("State changed: %s"

323

% unicode(error))

414

324

def cleanup(self):

415

325

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

416

326

if self.group is not None:

421

331

pass

422

332

self.group = None

423

333

self.remove()

424

425

334

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

426

335

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

427

336

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

428

bad_states = {

429

avahi.SERVER_INVALID: "Zeroconf server invalid",

430

avahi.SERVER_REGISTERING: None,

431

avahi.SERVER_COLLISION: "Zeroconf server name collision",

432

avahi.SERVER_FAILURE: "Zeroconf server failure",

433

}

337

bad_states = { avahi.SERVER_INVALID:

338

"Zeroconf server invalid",

339

avahi.SERVER_REGISTERING: None,

340

avahi.SERVER_COLLISION:

341

"Zeroconf server name collision",

342

avahi.SERVER_FAILURE:

343

"Zeroconf server failure" }

434

344

if state in bad_states:

435

345

if bad_states[state] is not None:

436

346

if error is None:

439

349

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

440

350

self.cleanup()

441

351

elif state == avahi.SERVER_RUNNING:

442

try:

443

self.add()

444

except dbus.exceptions.DBusException as error:

445

if (error.get_dbus_name()

446

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

447

logger.info("Local Zeroconf service name"

448

" collision.")

449

return self.rename(remove=False)

450

else:

451

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

452

self.cleanup()

453

os._exit(1)

352

self.add()

454

353

else:

455

354

if error is None:

456

355

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

457

356

else:

458

357

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

459

460

358

def activate(self):

461

359

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

462

360

if self.server is None:

466

364

follow_name_owner_changes=True),

467

365

avahi.DBUS_INTERFACE_SERVER)

468

366

self.server.connect_to_signal("StateChanged",

469

self.server_state_changed)

367

self.server_state_changed)

470

368

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

471

369

472

473

370

class AvahiServiceToSyslog(AvahiService):

474

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

371

def rename(self):

475

372

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

476

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

477

syslogger.setFormatter(logging.Formatter(

478

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

479

.format(self.name)))

373

ret = AvahiService.rename(self)

374

syslogger.setFormatter(logging.Formatter

375

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

376

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

377

% self.name))

480

378

return ret

481

379

482

# Pretend that we have a GnuTLS module

483

class GnuTLS(object):

484

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

485

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

486

487

_library = ctypes.cdll.LoadLibrary(

488

ctypes.util.find_library("gnutls"))

489

_need_version = b"3.3.0"

490

def __init__(self):

491

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

492

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

493

# happens.

494

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

495

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

496

.format(self._need_version))

497

498

# Unless otherwise indicated, the constants and types below are

499

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

500

501

# Constants

502

E_SUCCESS = 0

503

E_INTERRUPTED = -52

504

E_AGAIN = -28

505

CRT_OPENPGP = 2

506

CLIENT = 2

507

SHUT_RDWR = 0

508

CRD_CERTIFICATE = 1

509

E_NO_CERTIFICATE_FOUND = -49

510

OPENPGP_FMT_RAW = 0 # gnutls/openpgp.h

511

512

# Types

513

class session_int(ctypes.Structure):

514

_fields_ = []

515

session_t = ctypes.POINTER(session_int)

516

class certificate_credentials_st(ctypes.Structure):

517

_fields_ = []

518

certificate_credentials_t = ctypes.POINTER(

519

certificate_credentials_st)

520

certificate_type_t = ctypes.c_int

521

class datum_t(ctypes.Structure):

522

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

523

('size', ctypes.c_uint)]

524

class openpgp_crt_int(ctypes.Structure):

525

_fields_ = []

526

openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)

527

openpgp_crt_fmt_t = ctypes.c_int # gnutls/openpgp.h

528

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

529

credentials_type_t = ctypes.c_int

530

transport_ptr_t = ctypes.c_void_p

531

close_request_t = ctypes.c_int

532

533

# Exceptions

534

class Error(Exception):

535

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

536

# exception might be raised from within GnuTLS.__init__,

537

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

538

# global variable has happened.

539

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

540

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

541

# code is passed, convert it to a string with

542

# gnutls.strerror()

543

self.code = code

544

if message is None and code is not None:

545

message = GnuTLS.strerror(code)

546

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

547

message, *args)

548

549

class CertificateSecurityError(Error):

550

pass

551

552

# Classes

553

class Credentials(object):

554

def __init__(self):

555

self._c_object = gnutls.certificate_credentials_t()

556

gnutls.certificate_allocate_credentials(

557

ctypes.byref(self._c_object))

558

self.type = gnutls.CRD_CERTIFICATE

559

560

def __del__(self):

561

gnutls.certificate_free_credentials(self._c_object)

562

563

class ClientSession(object):

564

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

565

self._c_object = gnutls.session_t()

566

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

567

gnutls.set_default_priority(self._c_object)

568

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

569

gnutls.handshake_set_private_extensions(self._c_object,

570

True)

571

self.socket = socket

572

if credentials is None:

573

credentials = gnutls.Credentials()

574

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

575

ctypes.cast(credentials._c_object,

576

ctypes.c_void_p))

577

self.credentials = credentials

578

579

def __del__(self):

580

gnutls.deinit(self._c_object)

581

582

def handshake(self):

583

return gnutls.handshake(self._c_object)

584

585

def send(self, data):

586

data = bytes(data)

587

data_len = len(data)

588

while data_len > 0:

589

data_len -= gnutls.record_send(self._c_object,

590

data[-data_len:],

591

data_len)

592

593

def bye(self):

594

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

595

596

# Error handling functions

597

def _error_code(result):

598

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

599

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

600

if result >= 0:

601

return result

602

if result == gnutls.E_NO_CERTIFICATE_FOUND:

603

raise gnutls.CertificateSecurityError(code = result)

604

raise gnutls.Error(code = result)

605

606

def _retry_on_error(result, func, arguments):

607

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

608

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

609

while result < 0:

610

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

611

return _error_code(result)

612

result = func(*arguments)

613

return result

614

615

# Unless otherwise indicated, the function declarations below are

616

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

617

618

# Functions

619

priority_set_direct = _library.gnutls_priority_set_direct

620

priority_set_direct.argtypes = [session_t, ctypes.c_char_p,

621

ctypes.POINTER(ctypes.c_char_p)]

622

priority_set_direct.restype = _error_code

623

624

init = _library.gnutls_init

625

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

626

init.restype = _error_code

627

628

set_default_priority = _library.gnutls_set_default_priority

629

set_default_priority.argtypes = [session_t]

630

set_default_priority.restype = _error_code

631

632

record_send = _library.gnutls_record_send

633

record_send.argtypes = [session_t, ctypes.c_void_p,

634

ctypes.c_size_t]

635

record_send.restype = ctypes.c_ssize_t

636

record_send.errcheck = _retry_on_error

637

638

certificate_allocate_credentials = (

639

_library.gnutls_certificate_allocate_credentials)

640

certificate_allocate_credentials.argtypes = [

641

ctypes.POINTER(certificate_credentials_t)]

642

certificate_allocate_credentials.restype = _error_code

643

644

certificate_free_credentials = (

645

_library.gnutls_certificate_free_credentials)

646

certificate_free_credentials.argtypes = [certificate_credentials_t]

647

certificate_free_credentials.restype = None

648

649

handshake_set_private_extensions = (

650

_library.gnutls_handshake_set_private_extensions)

651

handshake_set_private_extensions.argtypes = [session_t,

652

ctypes.c_int]

653

handshake_set_private_extensions.restype = None

654

655

credentials_set = _library.gnutls_credentials_set

656

credentials_set.argtypes = [session_t, credentials_type_t,

657

ctypes.c_void_p]

658

credentials_set.restype = _error_code

659

660

strerror = _library.gnutls_strerror

661

strerror.argtypes = [ctypes.c_int]

662

strerror.restype = ctypes.c_char_p

663

664

certificate_type_get = _library.gnutls_certificate_type_get

665

certificate_type_get.argtypes = [session_t]

666

certificate_type_get.restype = _error_code

667

668

certificate_get_peers = _library.gnutls_certificate_get_peers

669

certificate_get_peers.argtypes = [session_t,

670

ctypes.POINTER(ctypes.c_uint)]

671

certificate_get_peers.restype = ctypes.POINTER(datum_t)

672

673

global_set_log_level = _library.gnutls_global_set_log_level

674

global_set_log_level.argtypes = [ctypes.c_int]

675

global_set_log_level.restype = None

676

677

global_set_log_function = _library.gnutls_global_set_log_function

678

global_set_log_function.argtypes = [log_func]

679

global_set_log_function.restype = None

680

681

deinit = _library.gnutls_deinit

682

deinit.argtypes = [session_t]

683

deinit.restype = None

684

685

handshake = _library.gnutls_handshake

686

handshake.argtypes = [session_t]

687

handshake.restype = _error_code

688

handshake.errcheck = _retry_on_error

689

690

transport_set_ptr = _library.gnutls_transport_set_ptr

691

transport_set_ptr.argtypes = [session_t, transport_ptr_t]

692

transport_set_ptr.restype = None

693

694

bye = _library.gnutls_bye

695

bye.argtypes = [session_t, close_request_t]

696

bye.restype = _error_code

697

bye.errcheck = _retry_on_error

698

699

check_version = _library.gnutls_check_version

700

check_version.argtypes = [ctypes.c_char_p]

701

check_version.restype = ctypes.c_char_p

702

703

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

704

705

openpgp_crt_init = _library.gnutls_openpgp_crt_init

706

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

707

openpgp_crt_init.restype = _error_code

708

709

openpgp_crt_import = _library.gnutls_openpgp_crt_import

710

openpgp_crt_import.argtypes = [openpgp_crt_t,

711

ctypes.POINTER(datum_t),

712

openpgp_crt_fmt_t]

713

openpgp_crt_import.restype = _error_code

714

715

openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self

716

openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,

717

ctypes.POINTER(ctypes.c_uint)]

718

openpgp_crt_verify_self.restype = _error_code

719

720

openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit

721

openpgp_crt_deinit.argtypes = [openpgp_crt_t]

722

openpgp_crt_deinit.restype = None

723

724

openpgp_crt_get_fingerprint = (

725

_library.gnutls_openpgp_crt_get_fingerprint)

726

openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,

727

ctypes.c_void_p,

728

ctypes.POINTER(

729

ctypes.c_size_t)]

730

openpgp_crt_get_fingerprint.restype = _error_code

731

732

# Remove non-public functions

733

del _error_code, _retry_on_error

734

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

735

gnutls = GnuTLS()

736

737

def call_pipe(connection, # : multiprocessing.Connection

738

func, *args, **kwargs):

739

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

740

741

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

742

return value on the provided multiprocessing.Connection.

743

"""

744

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

745

connection.close()

746

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

747

386

class Client(object):

748

387

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

749

388

754

393

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

755

394

to see if the client lives.

756

395

'None' if no process is running.

757

checker_callback_tag: a GLib event source tag, or None

396

checker_callback_tag: a gobject event source tag, or None

758

397

checker_command: string; External command which is run to check

759

398

if client lives. %() expansions are done at

760

399

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

761

400

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

762

checker_initiator_tag: a GLib event source tag, or None

401

checker_initiator_tag: a gobject event source tag, or None

763

402

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

764

403

client_structure: Object describing what attributes a client has

765

404

and is used for storing the client at exit

766

405

current_checker_command: string; current running checker_command

767

disable_initiator_tag: a GLib event source tag, or None

406

disable_initiator_tag: a gobject event source tag, or None

768

407

enabled: bool()

769

408

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

770

409

uniquely identify the client

774

413

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

775

414

last_checker_status: integer between 0 and 255 reflecting exit

776

415

status of last checker. -1 reflects crashed

777

checker, -2 means no checker completed yet.

778

last_checker_signal: The signal which killed the last checker, if

779

last_checker_status is -1

416

checker, or None.

780

417

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

781

418

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

782

419

D-Bus identifiers

783

420

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

784

421

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

785

422

until this client is disabled

786

extended_timeout: extra long timeout when secret has been sent

423

extended_timeout: extra long timeout when password has been sent

787

424

runtime_expansions: Allowed attributes for runtime expansion.

788

425

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

789

426

disabled, or None

790

server_settings: The server_settings dict from main()

791

427

"""

792

428

793

429

runtime_expansions = ("approval_delay", "approval_duration",

794

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

795

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

796

"last_approval_request", "last_checked_ok",

430

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

431

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

797

432

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

798

client_defaults = {

799

"timeout": "PT5M",

800

"extended_timeout": "PT15M",

801

"interval": "PT2M",

802

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

803

"host": "",

804

"approval_delay": "PT0S",

805

"approval_duration": "PT1S",

806

"approved_by_default": "True",

807

"enabled": "True",

808

}

809

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

810

459

@staticmethod

811

460

def config_parser(config):

812

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

461

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

813

462

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

814

with exceptions for any special settings as defined above.

815

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

816

value given the same arguments.

817

"""

463

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

818

464

settings = {}

819

465

for client_name in config.sections():

820

466

section = dict(config.items(client_name))

824

470

# Reformat values from string types to Python types

825

471

client["approved_by_default"] = config.getboolean(

826

472

client_name, "approved_by_default")

827

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

828

"enabled")

473

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

829

474

830

# Uppercase and remove spaces from fingerprint for later

831

# comparison purposes with return value from the

832

# fingerprint() function

833

475

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

834

476

.replace(" ", ""))

835

477

if "secret" in section:

836

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

837

.encode("utf-8"),

838

"base64")

478

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

839

479

elif "secfile" in section:

840

480

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

841

481

(section["secfile"])),

842

482

"rb") as secfile:

843

483

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

844

484

else:

845

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

846

.format(section))

485

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

486

% section)

847

487

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

848

488

client["extended_timeout"] = string_to_delta(

849

489

section["extended_timeout"])

855

495

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

856

496

client["last_approval_request"] = None

857

497

client["last_checked_ok"] = None

858

client["last_checker_status"] = -2

859

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

860

507

return settings

861

862

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

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."""

863

514

self.name = name

864

if server_settings is None:

865

server_settings = {}

866

self.server_settings = server_settings

867

515

# adding all client settings

868

for setting, value in settings.items():

516

for setting, value in settings.iteritems():

869

517

setattr(self, setting, value)

870

518

871

if self.enabled:

872

if not hasattr(self, "last_enabled"):

873

self.last_enabled = datetime.datetime.utcnow()

874

if not hasattr(self, "expires"):

875

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

876

+ self.timeout)

877

else:

878

self.last_enabled = None

879

self.expires = None

880

881

519

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

882

523

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

883

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

884

datetime.datetime.utcnow())

885

524

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

525

886

526

# attributes specific for this server instance

887

527

self.checker = None

888

528

self.checker_initiator_tag = None

891

531

self.current_checker_command = None

892

532

self.approved = None

893

533

self.approvals_pending = 0

894

self.changedstate = multiprocessing_manager.Condition(

895

multiprocessing_manager.Lock())

896

self.client_structure = [attr

897

for attr in self.__dict__.keys()

534

self.changedstate = (multiprocessing_manager

535

.Condition(multiprocessing_manager

536

.Lock()))

537

self.client_structure = [attr for attr in

538

self.__dict__.iterkeys()

898

539

if not attr.startswith("_")]

899

540

self.client_structure.append("client_structure")

900

541

901

for name, t in inspect.getmembers(

902

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

542

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

543

lambda obj:

544

isinstance(obj,

545

property)):

903

546

if not name.startswith("_"):

904

547

self.client_structure.append(name)

905

548

913

556

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

914

557

# Already enabled

915

558

return

559

self.send_changedstate()

916

560

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

917

561

self.enabled = True

918

562

self.last_enabled = datetime.datetime.utcnow()

919

563

self.init_checker()

920

self.send_changedstate()

921

564

922

565

def disable(self, quiet=True):

923

566

"""Disable this client."""

924

567

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

925

568

return False

926

569

if not quiet:

570

self.send_changedstate()

571

if not quiet:

927

572

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

928

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

929

GLib.source_remove(self.disable_initiator_tag)

573

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

574

gobject.source_remove(self.disable_initiator_tag)

930

575

self.disable_initiator_tag = None

931

576

self.expires = None

932

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

933

GLib.source_remove(self.checker_initiator_tag)

577

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

578

gobject.source_remove(self.checker_initiator_tag)

934

579

self.checker_initiator_tag = None

935

580

self.stop_checker()

936

581

self.enabled = False

937

if not quiet:

938

self.send_changedstate()

939

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

582

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

940

583

return False

941

584

942

585

def __del__(self):

945

588

def init_checker(self):

946

589

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

947

590

# and every interval from then on.

948

if self.checker_initiator_tag is not None:

949

GLib.source_remove(self.checker_initiator_tag)

950

self.checker_initiator_tag = GLib.timeout_add(

951

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

952

self.start_checker)

591

self.checker_initiator_tag = (gobject.timeout_add

592

(self.interval_milliseconds(),

593

self.start_checker))

953

594

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

954

if self.disable_initiator_tag is not None:

955

GLib.source_remove(self.disable_initiator_tag)

956

self.disable_initiator_tag = GLib.timeout_add(

957

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

595

self.disable_initiator_tag = (gobject.timeout_add

596

(self.timeout_milliseconds(),

597

self.disable))

958

598

# Also start a new checker *right now*.

959

599

self.start_checker()

960

600

961

def checker_callback(self, source, condition, connection,

962

command):

601

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

963

602

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

964

603

self.checker_callback_tag = None

965

604

self.checker = None

966

# Read return code from connection (see call_pipe)

967

returncode = connection.recv()

968

connection.close()

969

970

if returncode >= 0:

971

self.last_checker_status = returncode

972

self.last_checker_signal = None

605

if os.WIFEXITED(condition):

606

self.last_checker_status = os.WEXITSTATUS(condition)

973

607

if self.last_checker_status == 0:

974

608

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

975

609

vars(self))

976

610

self.checked_ok()

977

611

else:

978

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

612

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

613

vars(self))

979

614

else:

980

615

self.last_checker_status = -1

981

self.last_checker_signal = -returncode

982

616

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

983

617

vars(self))

984

return False

985

986

def checked_ok(self):

987

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

988

self.last_checked_ok = datetime.datetime.utcnow()

989

self.last_checker_status = 0

990

self.last_checker_signal = None

991

self.bump_timeout()

992

993

def bump_timeout(self, timeout=None):

994

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

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

"""

995

625

if timeout is None:

996

626

timeout = self.timeout

627

self.last_checked_ok = datetime.datetime.utcnow()

997

628

if self.disable_initiator_tag is not None:

998

GLib.source_remove(self.disable_initiator_tag)

999

self.disable_initiator_tag = None

629

gobject.source_remove(self.disable_initiator_tag)

1000

630

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

1001

self.disable_initiator_tag = GLib.timeout_add(

1002

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

631

self.disable_initiator_tag = (gobject.timeout_add

632

(timedelta_to_milliseconds

633

(timeout), self.disable))

1003

634

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

1004

635

1005

636

def need_approval(self):

1011

642

If a checker already exists, leave it running and do

1012

643

nothing."""

1013

644

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

1014

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

1015

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

1016

# would inevitably timeout, since no checker would get a

1017

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

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

1018

649

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

1019

650

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

1020

651

# should be.

1021

652

1022

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

1023

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

1024

self.checker.join()

1025

self.checker = None

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)

1026

666

# Start a new checker if needed

1027

667

if self.checker is None:

1028

# Escape attributes for the shell

1029

escaped_attrs = {

1030

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

1031

for attr in self.runtime_expansions }

1032

668

try:

1033

command = self.checker_command % escaped_attrs

1034

except TypeError as error:

1035

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

1036

self.checker_command,

1037

exc_info=error)

1038

return True # Try again later

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

1039

687

self.current_checker_command = command

1040

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

1041

self.name)

1042

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

1043

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

1044

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

1045

# always replaced by /dev/null.)

1046

# The exception is when not debugging but nevertheless

1047

# running in the foreground; use the previously

1048

# created wnull.

1049

popen_args = { "close_fds": True,

1050

"shell": True,

1051

"cwd": "/" }

1052

if (not self.server_settings["debug"]

1053

and self.server_settings["foreground"]):

1054

popen_args.update({"stdout": wnull,

1055

"stderr": wnull })

1056

pipe = multiprocessing.Pipe(duplex = False)

1057

self.checker = multiprocessing.Process(

1058

target = call_pipe,

1059

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

1060

kwargs = popen_args)

1061

self.checker.start()

1062

self.checker_callback_tag = GLib.io_add_watch(

1063

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

1064

self.checker_callback, pipe[0], command)

1065

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

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)

711

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

1066

712

return True

1067

713

1068

714

def stop_checker(self):

1069

715

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

1070

716

if self.checker_callback_tag:

1071

GLib.source_remove(self.checker_callback_tag)

717

gobject.source_remove(self.checker_callback_tag)

1072

718

self.checker_callback_tag = None

1073

719

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

1074

720

return

1075

721

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

1076

self.checker.terminate()

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

1077

730

self.checker = None

1078

731

1079

732

1080

def dbus_service_property(dbus_interface,

1081

signature="v",

1082

access="readwrite",

1083

byte_arrays=False):

733

def dbus_service_property(dbus_interface, signature="v",

734

access="readwrite", byte_arrays=False):

1084

735

"""Decorators for marking methods of a DBusObjectWithProperties to

1085

736

become properties on the D-Bus.

1086

737

1095

746

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

1096

747

if byte_arrays and signature != "ay":

1097

748

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

1098

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

1099

749

" signature %r" % signature)

1100

750

def decorator(func):

1101

751

func._dbus_is_property = True

1102

752

func._dbus_interface = dbus_interface

1107

757

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

1108

758

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

1109

759

return func

1110

1111

return decorator

1112

1113

1114

def dbus_interface_annotations(dbus_interface):

1115

"""Decorator for marking functions returning interface annotations

1116

1117

Usage:

1118

1119

@dbus_interface_annotations("org.example.Interface")

1120

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

1121

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

1122

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

1123

"false"}

1124

"""

1125

1126

def decorator(func):

1127

func._dbus_is_interface = True

1128

func._dbus_interface = dbus_interface

1129

func._dbus_name = dbus_interface

1130

return func

1131

1132

return decorator

1133

1134

1135

def dbus_annotations(annotations):

1136

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

1137

Usage:

1138

1139

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

1140

"org.freedesktop.DBus.Property."

1141

"EmitsChangedSignal": "false"})

1142

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

1143

access="r")

1144

def Property_dbus_property(self):

1145

return dbus.Boolean(False)

1146

1147

See also the DBusObjectWithAnnotations class.

1148

"""

1149

1150

def decorator(func):

1151

func._dbus_annotations = annotations

1152

return func

1153

1154

760

return decorator

1155

761

1156

762

1157

763

class DBusPropertyException(dbus.exceptions.DBusException):

1158

764

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

1159

765

"""

1160

pass

766

def __unicode__(self):

767

return unicode(str(self))

1161

768

1162

769

1163

770

class DBusPropertyAccessException(DBusPropertyException):

1172

779

pass

1173

780

1174

781

1175

class DBusObjectWithAnnotations(dbus.service.Object):

1176

"""A D-Bus object with annotations.

1177

1178

Classes inheriting from this can use the dbus_annotations

1179

decorator to add annotations to methods or signals.

1180

"""

1181

1182

@staticmethod

1183

def _is_dbus_thing(thing):

1184

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

1185

1186

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

1187

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

1188

"""

1189

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

1190

False)

1191

1192

def _get_all_dbus_things(self, thing):

1193

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

1194

"""

1195

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

1196

athing.__get__(self))

1197

for cls in self.__class__.__mro__

1198

for name, athing in

1199

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

1200

1201

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1202

out_signature = "s",

1203

path_keyword = 'object_path',

1204

connection_keyword = 'connection')

1205

def Introspect(self, object_path, connection):

1206

"""Overloading of standard D-Bus method.

1207

1208

Inserts annotation tags on methods and signals.

1209

"""

1210

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

1211

connection)

1212

try:

1213

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

1214

1215

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

1216

# Add annotation tags

1217

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

1218

for tag in if_tag.getElementsByTagName(typ):

1219

annots = dict()

1220

for name, prop in (self.

1221

_get_all_dbus_things(typ)):

1222

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

1223

and prop._dbus_interface

1224

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

1225

annots.update(getattr(

1226

prop, "_dbus_annotations", {}))

1227

for name, value in annots.items():

1228

ann_tag = document.createElement(

1229

"annotation")

1230

ann_tag.setAttribute("name", name)

1231

ann_tag.setAttribute("value", value)

1232

tag.appendChild(ann_tag)

1233

# Add interface annotation tags

1234

for annotation, value in dict(

1235

itertools.chain.from_iterable(

1236

annotations().items()

1237

for name, annotations

1238

in self._get_all_dbus_things("interface")

1239

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

1240

)).items():

1241

ann_tag = document.createElement("annotation")

1242

ann_tag.setAttribute("name", annotation)

1243

ann_tag.setAttribute("value", value)

1244

if_tag.appendChild(ann_tag)

1245

# Fix argument name for the Introspect method itself

1246

if (if_tag.getAttribute("name")

1247

== dbus.INTROSPECTABLE_IFACE):

1248

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

1249

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

1250

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

1251

if (arg.getAttribute("direction")

1252

== "out"):

1253

arg.setAttribute("name",

1254

"xml_data")

1255

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

1256

document.unlink()

1257

except (AttributeError, xml.dom.DOMException,

1258

xml.parsers.expat.ExpatError) as error:

1259

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

1260

exc_info=error)

1261

return xmlstring

1262

1263

1264

class DBusObjectWithProperties(DBusObjectWithAnnotations):

782

class DBusObjectWithProperties(dbus.service.Object):

1265

783

"""A D-Bus object with properties.

1266

784

1267

785

Classes inheriting from this can use the dbus_service_property

1269

787

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

1270

788

"""

1271

789

790

@staticmethod

791

def _is_dbus_property(obj):

792

return getattr(obj, "_dbus_is_property", False)

793

794

def _get_all_dbus_properties(self):

795

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

796

"""

797

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

798

for cls in self.__class__.__mro__

799

for name, prop in

800

inspect.getmembers(cls, self._is_dbus_property))

801

1272

802

def _get_dbus_property(self, interface_name, property_name):

1273

803

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

1274

804

property with the specified name and interface.

1275

805

"""

1276

for cls in self.__class__.__mro__:

1277

for name, value in inspect.getmembers(

1278

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

806

for cls in self.__class__.__mro__:

807

for name, value in (inspect.getmembers

808

(cls, self._is_dbus_property)):

1279

809

if (value._dbus_name == property_name

1280

810

and value._dbus_interface == interface_name):

1281

811

return value.__get__(self)

1282

812

1283

813

# No such property

1284

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

1285

self.dbus_object_path, interface_name, property_name))

1286

1287

@classmethod

1288

def _get_all_interface_names(cls):

1289

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

1290

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

1291

"_dbus_interface", None)

1292

for x in (inspect.getmro(cls))

1293

for attr in dir(x))

1294

if name is not None)

1295

1296

@dbus.service.method(dbus.PROPERTIES_IFACE,

1297

in_signature="ss",

814

raise DBusPropertyNotFound(self.dbus_object_path + ":"

815

+ interface_name + "."

816

+ property_name)

817

818

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

1298

819

out_signature="v")

1299

820

def Get(self, interface_name, property_name):

1300

821

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

1318

839

# The byte_arrays option is not supported yet on

1319

840

# signatures other than "ay".

1320

841

if prop._dbus_signature != "ay":

1321

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

1322

"'ay' signature {!r}"

1323

.format(prop._dbus_signature))

1324

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

1325

for byte in value))

842

raise ValueError

843

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

844

for byte in value))

1326

845

prop(value)

1327

846

1328

@dbus.service.method(dbus.PROPERTIES_IFACE,

1329

in_signature="s",

847

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

1330

848

out_signature="a{sv}")

1331

849

def GetAll(self, interface_name):

1332

850

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

1335

853

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

1336

854

"""

1337

855

properties = {}

1338

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

856

for name, prop in self._get_all_dbus_properties():

1339

857

if (interface_name

1340

858

and interface_name != prop._dbus_interface):

1341

859

# Interface non-empty but did not match

1347

865

if not hasattr(value, "variant_level"):

1348

866

properties[name] = value

1349

867

continue

1350

properties[name] = type(value)(

1351

value, variant_level = value.variant_level + 1)

868

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

869

value.variant_level+1)

1352

870

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

1353

871

1354

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

1355

def PropertiesChanged(self, interface_name, changed_properties,

1356

invalidated_properties):

1357

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

1358

standard.

1359

"""

1360

pass

1361

1362

872

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1363

873

out_signature="s",

1364

874

path_keyword='object_path',

1365

875

connection_keyword='connection')

1366

876

def Introspect(self, object_path, connection):

1367

"""Overloading of standard D-Bus method.

1368

1369

Inserts property tags and interface annotation tags.

877

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

1370

878

"""

1371

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1372

object_path,

1373

connection)

879

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

880

connection)

1374

881

try:

1375

882

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

1376

1377

883

def make_tag(document, name, prop):

1378

884

e = document.createElement("property")

1379

885

e.setAttribute("name", name)

1380

886

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

1381

887

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

1382

888

return e

1383

1384

889

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

1385

# Add property tags

1386

890

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

1387

891

for name, prop

1388

in self._get_all_dbus_things("property")

892

in self._get_all_dbus_properties()

1389

893

if prop._dbus_interface

1390

894

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

1391

895

if_tag.appendChild(tag)

1392

# Add annotation tags for properties

1393

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

1394

annots = dict()

1395

for name, prop in self._get_all_dbus_things(

1396

"property"):

1397

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

1398

and prop._dbus_interface

1399

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

1400

annots.update(getattr(

1401

prop, "_dbus_annotations", {}))

1402

for name, value in annots.items():

1403

ann_tag = document.createElement(

1404

"annotation")

1405

ann_tag.setAttribute("name", name)

1406

ann_tag.setAttribute("value", value)

1407

tag.appendChild(ann_tag)

1408

896

# Add the names to the return values for the

1409

897

# "org.freedesktop.DBus.Properties" methods

1410

898

if (if_tag.getAttribute("name")

1425

913

except (AttributeError, xml.dom.DOMException,

1426

914

xml.parsers.expat.ExpatError) as error:

1427

915

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

1428

exc_info=error)

1429

return xmlstring

1430

1431

try:

1432

dbus.OBJECT_MANAGER_IFACE

1433

except AttributeError:

1434

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

1435

1436

class DBusObjectWithObjectManager(DBusObjectWithAnnotations):

1437

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

1438

1439

Classes inheriting from this exposes the standard

1440

GetManagedObjects call and the InterfacesAdded and

1441

InterfacesRemoved signals on the standard

1442

"org.freedesktop.DBus.ObjectManager" interface.

1443

1444

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

1445

manually.

1446

"""

1447

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

1448

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

1449

def GetManagedObjects(self):

1450

"""This function must be overridden"""

1451

raise NotImplementedError()

1452

1453

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,

1454

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

1455

def InterfacesAdded(self, object_path, interfaces_and_properties):

1456

pass

1457

1458

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

1459

def InterfacesRemoved(self, object_path, interfaces):

1460

pass

1461

1462

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1463

out_signature = "s",

1464

path_keyword = 'object_path',

1465

connection_keyword = 'connection')

1466

def Introspect(self, object_path, connection):

1467

"""Overloading of standard D-Bus method.

1468

1469

Override return argument name of GetManagedObjects to be

1470

"objpath_interfaces_and_properties"

1471

"""

1472

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1473

object_path,

1474

connection)

1475

try:

1476

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

1477

1478

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

1479

# Fix argument name for the GetManagedObjects method

1480

if (if_tag.getAttribute("name")

1481

== dbus.OBJECT_MANAGER_IFACE):

1482

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

1483

if (cn.getAttribute("name")

1484

== "GetManagedObjects"):

1485

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

1486

if (arg.getAttribute("direction")

1487

== "out"):

1488

arg.setAttribute(

1489

"name",

1490

"objpath_interfaces"

1491

"_and_properties")

1492

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

1493

document.unlink()

1494

except (AttributeError, xml.dom.DOMException,

1495

xml.parsers.expat.ExpatError) as error:

1496

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

1497

exc_info = error)

1498

return xmlstring

1499

1500

def datetime_to_dbus(dt, variant_level=0):

916

error)

917

return xmlstring

918

919

920

def datetime_to_dbus (dt, variant_level=0):

1501

921

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

1502

922

if dt is None:

1503

923

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

1504

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

1505

1506

1507

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1508

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

1509

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

1510

interface names according to the "alt_interface_names" mapping.

1511

Usage:

1512

1513

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

1514

"net.example.AlternateInterface"})

1515

class SampleDBusObject(dbus.service.Object):

1516

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

1517

def SampleDBusMethod():

1518

pass

1519

1520

The above "SampleDBusMethod" on "SampleDBusObject" will be

1521

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

1522

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

1523

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

1524

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

1525

1526

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

1527

(from DBusObjectWithProperties) and interfaces (from the

1528

dbus_interface_annotations decorator).

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.

1529

932

"""

1530

1531

def wrapper(cls):

1532

for orig_interface_name, alt_interface_name in (

1533

alt_interface_names.items()):

1534

attr = {}

1535

interface_names = set()

1536

# Go though all attributes of the class

1537

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

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):

1538

940

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

1539

941

# with the wrong interface name

1540

942

if (not hasattr(attribute, "_dbus_interface")

1541

or not attribute._dbus_interface.startswith(

1542

orig_interface_name)):

943

or not attribute._dbus_interface

944

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

1543

945

continue

1544

946

# Create an alternate D-Bus interface name based on

1545

947

# the current name

1546

alt_interface = attribute._dbus_interface.replace(

1547

orig_interface_name, alt_interface_name)

1548

interface_names.add(alt_interface)

948

alt_interface = (attribute._dbus_interface

949

.replace("se.recompile.Mandos",

950

"se.bsnet.fukt.Mandos"))

1549

951

# Is this a D-Bus signal?

1550

952

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

1551

# Extract the original non-method undecorated

1552

# function by black magic

1553

if sys.version_info.major == 2:

1554

nonmethod_func = (dict(

953

# Extract the original non-method function by

954

# black magic

955

nonmethod_func = (dict(

1555

956

zip(attribute.func_code.co_freevars,

1556

attribute.__closure__))

1557

["func"].cell_contents)

1558

else:

1559

nonmethod_func = (dict(

1560

zip(attribute.__code__.co_freevars,

1561

attribute.__closure__))

1562

["func"].cell_contents)

957

attribute.__closure__))["func"]

958

.cell_contents)

1563

959

# Create a new, but exactly alike, function

1564

960

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

1565

961

# with the alternate D-Bus interface name

1566

new_function = copy_function(nonmethod_func)

1567

new_function = (dbus.service.signal(

1568

alt_interface,

1569

attribute._dbus_signature)(new_function))

1570

# Copy annotations, if any

1571

try:

1572

new_function._dbus_annotations = dict(

1573

attribute._dbus_annotations)

1574

except AttributeError:

1575

pass

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)))

1576

971

# Define a creator of a function to call both the

1577

# original and alternate functions, so both the

1578

# original and alternate signals gets sent when

1579

# the function is called

972

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

973

# signals gets sent when the function is called

1580

974

def fixscope(func1, func2):

1581

975

"""This function is a scope container to pass

1582

976

func1 and func2 to the "call_both" function

1583

977

outside of its arguments"""

1584

1585

@functools.wraps(func2)

1586

978

def call_both(*args, **kwargs):

1587

979

"""This function will emit two D-Bus

1588

980

signals by calling func1 and func2"""

1589

981

func1(*args, **kwargs)

1590

982

func2(*args, **kwargs)

1591

# Make wrapper function look like a D-Bus signal

1592

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

1593

if name.startswith("_dbus_"):

1594

setattr(call_both, name, attr)

1595

1596

983

return call_both

1597

984

# Create the "call_both" function and add it to

1598

985

# the class

1599

attr[attrname] = fixscope(attribute, new_function)

986

attr[attrname] = fixscope(attribute,

987

new_function)

1600

988

# Is this a D-Bus method?

1601

989

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

1602

990

# Create a new, but exactly alike, function

1603

991

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

1604

992

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

1605

993

# to the class.

1606

attr[attrname] = (

1607

dbus.service.method(

1608

alt_interface,

1609

attribute._dbus_in_signature,

1610

attribute._dbus_out_signature)

1611

(copy_function(attribute)))

1612

# Copy annotations, if any

1613

try:

1614

attr[attrname]._dbus_annotations = dict(

1615

attribute._dbus_annotations)

1616

except AttributeError:

1617

pass

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)))

1618

1004

# Is this a D-Bus property?

1619

1005

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

1620

1006

# Create a new, but exactly alike, function

1621

1007

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

1622

1008

# property with the alternate D-Bus interface

1623

1009

# name. Add it to the class.

1624

attr[attrname] = (dbus_service_property(

1625

alt_interface, attribute._dbus_signature,

1626

attribute._dbus_access,

1627

attribute._dbus_get_args_options

1628

["byte_arrays"])

1629

(copy_function(attribute)))

1630

# Copy annotations, if any

1631

try:

1632

attr[attrname]._dbus_annotations = dict(

1633

attribute._dbus_annotations)

1634

except AttributeError:

1635

pass

1636

# Is this a D-Bus interface?

1637

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

1638

# Create a new, but exactly alike, function

1639

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

1640

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

1641

# to the class.

1642

attr[attrname] = (

1643

dbus_interface_annotations(alt_interface)

1644

(copy_function(attribute)))

1645

if deprecate:

1646

# Deprecate all alternate interfaces

1647

iname="_AlternateDBusNames_interface_annotation{}"

1648

for interface_name in interface_names:

1649

1650

@dbus_interface_annotations(interface_name)

1651

def func(self):

1652

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

1653

"true" }

1654

# Find an unused name

1655

for aname in (iname.format(i)

1656

for i in itertools.count()):

1657

if aname not in attr:

1658

attr[aname] = func

1659

break

1660

if interface_names:

1661

# Replace the class with a new subclass of it with

1662

# methods, signals, etc. as created above.

1663

if sys.version_info.major == 2:

1664

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

1665

(cls, ), attr)

1666

else:

1667

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

1668

(cls, ), attr)

1669

return cls

1670

1671

return wrapper

1672

1673

1674

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

1675

"se.bsnet.fukt.Mandos"})

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

1676

1026

class ClientDBus(Client, DBusObjectWithProperties):

1677

1027

"""A Client class using D-Bus

1678

1028

1682

1032

"""

1683

1033

1684

1034

runtime_expansions = (Client.runtime_expansions

1685

+ ("dbus_object_path", ))

1686

1687

_interface = "se.recompile.Mandos.Client"

1035

+ ("dbus_object_path",))

1688

1036

1689

1037

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

1690

1038

1691

1039

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

1692

1040

self.bus = bus

1693

1041

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

1042

self._approvals_pending = 0

1043

1044

self._approvals_pending = 0

1694

1045

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

1695

1046

# the D-Bus

1696

client_object_name = str(self.name).translate(

1047

client_object_name = unicode(self.name).translate(

1697

1048

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

1698

1049

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

1699

self.dbus_object_path = dbus.ObjectPath(

1700

"/clients/" + client_object_name)

1050

self.dbus_object_path = (dbus.ObjectPath

1051

("/clients/" + client_object_name))

1701

1052

DBusObjectWithProperties.__init__(self, self.bus,

1702

1053

self.dbus_object_path)

1703

1704

def notifychangeproperty(transform_func, dbus_name,

1705

type_func=lambda x: x,

1706

variant_level=1,

1707

invalidate_only=False,

1708

_interface=_interface):

1054

1055

def notifychangeproperty(transform_func,

1056

dbus_name, type_func=lambda x: x,

1057

variant_level=1):

1709

1058

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

1710

1059

its changes to DBus.

1711

1060

1716

1065

to the D-Bus. Default: no transform

1717

1066

variant_level: D-Bus variant level. Default: 1

1718

1067

"""

1719

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

1720

1068

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

1721

1069

def setter(self, value):

1722

1070

if hasattr(self, "dbus_object_path"):

1723

1071

if (not hasattr(self, attrname) or

1724

1072

type_func(getattr(self, attrname, None))

1725

1073

!= type_func(value)):

1726

if invalidate_only:

1727

self.PropertiesChanged(

1728

_interface, dbus.Dictionary(),

1729

dbus.Array((dbus_name, )))

1730

else:

1731

dbus_value = transform_func(

1732

type_func(value),

1733

variant_level = variant_level)

1734

self.PropertyChanged(dbus.String(dbus_name),

1735

dbus_value)

1736

self.PropertiesChanged(

1737

_interface,

1738

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

1739

dbus_value }),

1740

dbus.Array())

1074

dbus_value = transform_func(type_func(value),

1075

variant_level

1076

=variant_level)

1077

self.PropertyChanged(dbus.String(dbus_name),

1078

dbus_value)

1741

1079

setattr(self, attrname, value)

1742

1080

1743

1081

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

1744

1082

1083

1745

1084

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1746

1085

approvals_pending = notifychangeproperty(dbus.Boolean,

1747

1086

"ApprovalPending",

1749

1088

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

1750

1089

last_enabled = notifychangeproperty(datetime_to_dbus,

1751

1090

"LastEnabled")

1752

checker = notifychangeproperty(

1753

dbus.Boolean, "CheckerRunning",

1754

type_func = lambda checker: checker is not None)

1091

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

1092

type_func = lambda checker:

1093

checker is not None)

1755

1094

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1756

1095

"LastCheckedOK")

1757

last_checker_status = notifychangeproperty(dbus.Int16,

1758

"LastCheckerStatus")

1759

1096

last_approval_request = notifychangeproperty(

1760

1097

datetime_to_dbus, "LastApprovalRequest")

1761

1098

approved_by_default = notifychangeproperty(dbus.Boolean,

1762

1099

"ApprovedByDefault")

1763

approval_delay = notifychangeproperty(

1764

dbus.UInt64, "ApprovalDelay",

1765

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

1100

approval_delay = notifychangeproperty(dbus.UInt64,

1101

"ApprovalDelay",

1102

type_func =

1103

timedelta_to_milliseconds)

1766

1104

approval_duration = notifychangeproperty(

1767

1105

dbus.UInt64, "ApprovalDuration",

1768

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

1106

type_func = timedelta_to_milliseconds)

1769

1107

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

1770

timeout = notifychangeproperty(

1771

dbus.UInt64, "Timeout",

1772

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

1108

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

1109

type_func =

1110

timedelta_to_milliseconds)

1773

1111

extended_timeout = notifychangeproperty(

1774

1112

dbus.UInt64, "ExtendedTimeout",

1775

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

1776

interval = notifychangeproperty(

1777

dbus.UInt64, "Interval",

1778

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

1113

type_func = timedelta_to_milliseconds)

1114

interval = notifychangeproperty(dbus.UInt64,

1115

"Interval",

1116

type_func =

1117

timedelta_to_milliseconds)

1779

1118

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

1780

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

1781

invalidate_only=True)

1782

1119

1783

1120

del notifychangeproperty

1784

1121

1791

1128

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

1792

1129

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

1793

1130

1794

def checker_callback(self, source, condition,

1795

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

1796

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

1797

connection, command, *args,

1798

**kwargs)

1799

exitstatus = self.last_checker_status

1800

if exitstatus >= 0:

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)

1801

1137

# Emit D-Bus signal

1802

1138

self.CheckerCompleted(dbus.Int16(exitstatus),

1803

# This is specific to GNU libC

1804

dbus.Int64(exitstatus << 8),

1139

dbus.Int64(condition),

1805

1140

dbus.String(command))

1806

1141

else:

1807

1142

# Emit D-Bus signal

1808

1143

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

1809

dbus.Int64(

1810

# This is specific to GNU libC

1811

(exitstatus << 8)

1812

| self.last_checker_signal),

1144

dbus.Int64(condition),

1813

1145

dbus.String(command))

1814

return ret

1146

1147

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

1148

*args, **kwargs)

1815

1149

1816

1150

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

1817

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

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

1818

1156

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

1819

1157

# Only if new checker process was started

1820

1158

if (self.checker is not None

1828

1166

return False

1829

1167

1830

1168

def approve(self, value=True):

1169

self.send_changedstate()

1831

1170

self.approved = value

1832

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

1833

* 1000), self._reset_approved)

1834

self.send_changedstate()

1171

gobject.timeout_add(timedelta_to_milliseconds

1172

(self.approval_duration),

1173

self._reset_approved)

1174

1835

1175

1836

1176

## D-Bus methods, signals & properties

1837

1838

## Interfaces

1177

_interface = "se.recompile.Mandos.Client"

1839

1178

1840

1179

## Signals

1841

1180

1852

1191

pass

1853

1192

1854

1193

# PropertyChanged - signal

1855

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

1856

1194

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

1857

1195

def PropertyChanged(self, property, value):

1858

1196

"D-Bus signal"

1879

1217

"D-Bus signal"

1880

1218

return self.need_approval()

1881

1219

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

1882

1228

## Methods

1883

1229

1884

1230

# Approve - method

1892

1238

self.checked_ok()

1893

1239

1894

1240

# Enable - method

1895

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

1896

1241

@dbus.service.method(_interface)

1897

1242

def Enable(self):

1898

1243

"D-Bus method"

1899

1244

self.enable()

1900

1245

1901

1246

# StartChecker - method

1902

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

1903

1247

@dbus.service.method(_interface)

1904

1248

def StartChecker(self):

1905

1249

"D-Bus method"

1906

1250

self.start_checker()

1907

1251

1908

1252

# Disable - method

1909

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

1910

1253

@dbus.service.method(_interface)

1911

1254

def Disable(self):

1912

1255

"D-Bus method"

1913

1256

self.disable()

1914

1257

1915

1258

# StopChecker - method

1916

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

1917

1259

@dbus.service.method(_interface)

1918

1260

def StopChecker(self):

1919

1261

self.stop_checker()

1926

1268

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

1927

1269

1928

1270

# ApprovedByDefault - property

1929

@dbus_service_property(_interface,

1930

signature="b",

1271

@dbus_service_property(_interface, signature="b",

1931

1272

access="readwrite")

1932

1273

def ApprovedByDefault_dbus_property(self, value=None):

1933

1274

if value is None: # get

1935

1276

self.approved_by_default = bool(value)

1936

1277

1937

1278

# ApprovalDelay - property

1938

@dbus_service_property(_interface,

1939

signature="t",

1279

@dbus_service_property(_interface, signature="t",

1940

1280

access="readwrite")

1941

1281

def ApprovalDelay_dbus_property(self, value=None):

1942

1282

if value is None: # get

1943

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

1944

* 1000)

1283

return dbus.UInt64(self.approval_delay_milliseconds())

1945

1284

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

1946

1285

1947

1286

# ApprovalDuration - property

1948

@dbus_service_property(_interface,

1949

signature="t",

1287

@dbus_service_property(_interface, signature="t",

1950

1288

access="readwrite")

1951

1289

def ApprovalDuration_dbus_property(self, value=None):

1952

1290

if value is None: # get

1953

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

1954

* 1000)

1291

return dbus.UInt64(timedelta_to_milliseconds(

1292

self.approval_duration))

1955

1293

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

1956

1294

1957

1295

# Name - property

1958

@dbus_annotations(

1959

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

1960

1296

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

1961

1297

def Name_dbus_property(self):

1962

1298

return dbus.String(self.name)

1963

1299

1964

1300

# Fingerprint - property

1965

@dbus_annotations(

1966

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

1967

1301

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

1968

1302

def Fingerprint_dbus_property(self):

1969

1303

return dbus.String(self.fingerprint)

1970

1304

1971

1305

# Host - property

1972

@dbus_service_property(_interface,

1973

signature="s",

1306

@dbus_service_property(_interface, signature="s",

1974

1307

access="readwrite")

1975

1308

def Host_dbus_property(self, value=None):

1976

1309

if value is None: # get

1977

1310

return dbus.String(self.host)

1978

self.host = str(value)

1311

self.host = unicode(value)

1979

1312

1980

1313

# Created - property

1981

@dbus_annotations(

1982

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

1983

1314

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

1984

1315

def Created_dbus_property(self):

1985

1316

return datetime_to_dbus(self.created)

1990

1321

return datetime_to_dbus(self.last_enabled)

1991

1322

1992

1323

# Enabled - property

1993

@dbus_service_property(_interface,

1994

signature="b",

1324

@dbus_service_property(_interface, signature="b",

1995

1325

access="readwrite")

1996

1326

def Enabled_dbus_property(self, value=None):

1997

1327

if value is None: # get

2002

1332

self.disable()

2003

1333

2004

1334

# LastCheckedOK - property

2005

@dbus_service_property(_interface,

2006

signature="s",

1335

@dbus_service_property(_interface, signature="s",

2007

1336

access="readwrite")

2008

1337

def LastCheckedOK_dbus_property(self, value=None):

2009

1338

if value is not None:

2011

1340

return

2012

1341

return datetime_to_dbus(self.last_checked_ok)

2013

1342

2014

# LastCheckerStatus - property

2015

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

2016

def LastCheckerStatus_dbus_property(self):

2017

return dbus.Int16(self.last_checker_status)

2018

2019

1343

# Expires - property

2020

1344

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

2021

1345

def Expires_dbus_property(self):

2027

1351

return datetime_to_dbus(self.last_approval_request)

2028

1352

2029

1353

# Timeout - property

2030

@dbus_service_property(_interface,

2031

signature="t",

1354

@dbus_service_property(_interface, signature="t",

2032

1355

access="readwrite")

2033

1356

def Timeout_dbus_property(self, value=None):

2034

1357

if value is None: # get

2035

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

2036

old_timeout = self.timeout

1358

return dbus.UInt64(self.timeout_milliseconds())

2037

1359

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

2038

# Reschedule disabling

2039

if self.enabled:

2040

now = datetime.datetime.utcnow()

2041

self.expires += self.timeout - old_timeout

2042

if self.expires <= now:

2043

# The timeout has passed

2044

self.disable()

2045

else:

2046

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

2047

is None):

2048

return

2049

GLib.source_remove(self.disable_initiator_tag)

2050

self.disable_initiator_tag = GLib.timeout_add(

2051

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

2052

self.disable)

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))

2053

1380

2054

1381

# ExtendedTimeout - property

2055

@dbus_service_property(_interface,

2056

signature="t",

1382

@dbus_service_property(_interface, signature="t",

2057

1383

access="readwrite")

2058

1384

def ExtendedTimeout_dbus_property(self, value=None):

2059

1385

if value is None: # get

2060

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

2061

* 1000)

1386

return dbus.UInt64(self.extended_timeout_milliseconds())

2062

1387

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

2063

1388

2064

1389

# Interval - property

2065

@dbus_service_property(_interface,

2066

signature="t",

1390

@dbus_service_property(_interface, signature="t",

2067

1391

access="readwrite")

2068

1392

def Interval_dbus_property(self, value=None):

2069

1393

if value is None: # get

2070

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

1394

return dbus.UInt64(self.interval_milliseconds())

2071

1395

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

2072

1396

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

2073

1397

return

2074

1398

if self.enabled:

2075

1399

# Reschedule checker run

2076

GLib.source_remove(self.checker_initiator_tag)

2077

self.checker_initiator_tag = GLib.timeout_add(

2078

value, self.start_checker)

2079

self.start_checker() # Start one now, too

1400

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

2080

1404

2081

1405

# Checker - property

2082

@dbus_service_property(_interface,

2083

signature="s",

1406

@dbus_service_property(_interface, signature="s",

2084

1407

access="readwrite")

2085

1408

def Checker_dbus_property(self, value=None):

2086

1409

if value is None: # get

2087

1410

return dbus.String(self.checker_command)

2088

self.checker_command = str(value)

1411

self.checker_command = unicode(value)

2089

1412

2090

1413

# CheckerRunning - property

2091

@dbus_service_property(_interface,

2092

signature="b",

1414

@dbus_service_property(_interface, signature="b",

2093

1415

access="readwrite")

2094

1416

def CheckerRunning_dbus_property(self, value=None):

2095

1417

if value is None: # get

2100

1422

self.stop_checker()

2101

1423

2102

1424

# ObjectPath - property

2103

@dbus_annotations(

2104

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

2105

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

2106

1425

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

2107

1426

def ObjectPath_dbus_property(self):

2108

1427

return self.dbus_object_path # is already a dbus.ObjectPath

2109

1428

2110

1429

# Secret = property

2111

@dbus_annotations(

2112

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

2113

"invalidates"})

2114

@dbus_service_property(_interface,

2115

signature="ay",

2116

access="write",

2117

byte_arrays=True)

1430

@dbus_service_property(_interface, signature="ay",

1431

access="write", byte_arrays=True)

2118

1432

def Secret_dbus_property(self, value):

2119

self.secret = bytes(value)

1433

self.secret = str(value)

2120

1434

2121

1435

del _interface

2122

1436

2126

1440

self._pipe = child_pipe

2127

1441

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

2128

1442

if not self._pipe.recv():

2129

raise KeyError(fpr)

1443

raise KeyError()

2130

1444

2131

1445

def __getattribute__(self, name):

2132

1446

if name == '_pipe':

2136

1450

if data[0] == 'data':

2137

1451

return data[1]

2138

1452

if data[0] == 'function':

2139

2140

1453

def func(*args, **kwargs):

2141

1454

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

2142

1455

return self._pipe.recv()[1]

2143

2144

1456

return func

2145

1457

2146

1458

def __setattr__(self, name, value):

2149

1461

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

2150

1462

2151

1463

1464

class ClientDBusTransitional(ClientDBus):

1465

__metaclass__ = AlternateDBusNamesMetaclass

1466

1467

2152

1468

class ClientHandler(socketserver.BaseRequestHandler, object):

2153

1469

"""A class to handle client connections.

2154

1470

2158

1474

def handle(self):

2159

1475

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

2160

1476

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

2161

str(self.client_address))

1477

unicode(self.client_address))

2162

1478

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

2163

1479

self.server.child_pipe.fileno())

2164

1480

2165

session = gnutls.ClientSession(self.request)

1481

session = (gnutls.connection

1482

.ClientSession(self.request,

1483

gnutls.connection

1484

.X509Credentials()))

1485

1486

# Note: gnutls.connection.X509Credentials is really a

1487

# generic GnuTLS certificate credentials object so long as

1488

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

1489

# here despite using OpenPGP certificates.

2166

1490

2167

1491

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

2168

1492

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

2172

1496

priority = self.server.gnutls_priority

2173

1497

if priority is None:

2174

1498

priority = "NORMAL"

2175

gnutls.priority_set_direct(session._c_object, priority,

2176

None)

1499

(gnutls.library.functions

1500

.gnutls_priority_set_direct(session._c_object,

1501

priority, None))

2177

1502

2178

1503

# Start communication using the Mandos protocol

2179

1504

# Get protocol number

2181

1506

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

2182

1507

try:

2183

1508

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

2184

raise RuntimeError(line)

1509

raise RuntimeError

2185

1510

except (ValueError, IndexError, RuntimeError) as error:

2186

1511

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

2187

1512

return

2189

1514

# Start GnuTLS connection

2190

1515

try:

2191

1516

session.handshake()

2192

except gnutls.Error as error:

1517

except gnutls.errors.GNUTLSError as error:

2193

1518

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

2194

1519

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

2195

1520

# established. Just abandon the request.

2199

1524

approval_required = False

2200

1525

try:

2201

1526

try:

2202

fpr = self.fingerprint(

2203

self.peer_certificate(session))

2204

except (TypeError, gnutls.Error) as error:

1527

fpr = self.fingerprint(self.peer_certificate

1528

(session))

1529

except (TypeError,

1530

gnutls.errors.GNUTLSError) as error:

2205

1531

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

2206

1532

return

2207

1533

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

2212

1538

except KeyError:

2213

1539

return

2214

1540

1541

if self.server.use_dbus:

1542

# Emit D-Bus signal

1543

client.NewRequest(str(self.client_address))

1544

2215

1545

if client.approval_delay:

2216

1546

delay = client.approval_delay

2217

1547

client.approvals_pending += 1

2220

1550

while True:

2221

1551

if not client.enabled:

2222

1552

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

2223

client.name)

1553

client.name)

2224

1554

if self.server.use_dbus:

2225

1555

# Emit D-Bus signal

2226

1556

client.Rejected("Disabled")

2235

1565

if self.server.use_dbus:

2236

1566

# Emit D-Bus signal

2237

1567

client.NeedApproval(

2238

client.approval_delay.total_seconds()

2239

* 1000, client.approved_by_default)

1568

client.approval_delay_milliseconds(),

1569

client.approved_by_default)

2240

1570

else:

2241

1571

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

2242

1572

client.name)

2248

1578

#wait until timeout or approved

2249

1579

time = datetime.datetime.now()

2250

1580

client.changedstate.acquire()

2251

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

1581

(client.changedstate.wait

1582

(float(client.timedelta_to_milliseconds(delay)

1583

/ 1000)))

2252

1584

client.changedstate.release()

2253

1585

time2 = datetime.datetime.now()

2254

1586

if (time2 - time) >= delay:

2265

1597

else:

2266

1598

delay -= time2 - time

2267

1599

2268

try:

2269

session.send(client.secret)

2270

except gnutls.Error as error:

2271

logger.warning("gnutls send failed",

2272

exc_info = error)

2273

return

1600

sent_size = 0

1601

while sent_size < len(client.secret):

1602

try:

1603

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

1604

except gnutls.errors.GNUTLSError as error:

1605

logger.warning("gnutls send failed")

1606

return

1607

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

1608

sent, len(client.secret)

1609

- (sent_size + sent))

1610

sent_size += sent

2274

1611

2275

1612

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

2276

1613

# bump the timeout using extended_timeout

2277

client.bump_timeout(client.extended_timeout)

1614

client.checked_ok(client.extended_timeout)

2278

1615

if self.server.use_dbus:

2279

1616

# Emit D-Bus signal

2280

1617

client.GotSecret()

2284

1621

client.approvals_pending -= 1

2285

1622

try:

2286

1623

session.bye()

2287

except gnutls.Error as error:

2288

logger.warning("GnuTLS bye failed",

2289

exc_info=error)

1624

except gnutls.errors.GNUTLSError as error:

1625

logger.warning("GnuTLS bye failed")

2290

1626

2291

1627

@staticmethod

2292

1628

def peer_certificate(session):

2293

1629

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

2294

1630

# If not an OpenPGP certificate...

2295

if (gnutls.certificate_type_get(session._c_object)

2296

!= gnutls.CRT_OPENPGP):

2297

# ...return invalid data

2298

return b""

1631

if (gnutls.library.functions

1632

.gnutls_certificate_type_get(session._c_object)

1633

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

1634

# ...do the normal thing

1635

return session.peer_certificate

2299

1636

list_size = ctypes.c_uint(1)

2300

cert_list = (gnutls.certificate_get_peers

1637

cert_list = (gnutls.library.functions

1638

.gnutls_certificate_get_peers

2301

1639

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

2302

1640

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

2303

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

1641

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

1642

" certificate")

2304

1643

if list_size.value == 0:

2305

1644

return None

2306

1645

cert = cert_list[0]

2310

1649

def fingerprint(openpgp):

2311

1650

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

2312

1651

# New GnuTLS "datum" with the OpenPGP public key

2313

datum = gnutls.datum_t(

2314

ctypes.cast(ctypes.c_char_p(openpgp),

2315

ctypes.POINTER(ctypes.c_ubyte)),

2316

ctypes.c_uint(len(openpgp)))

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))))

2317

1657

# New empty GnuTLS certificate

2318

crt = gnutls.openpgp_crt_t()

2319

gnutls.openpgp_crt_init(ctypes.byref(crt))

1658

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1659

(gnutls.library.functions

1660

.gnutls_openpgp_crt_init(ctypes.byref(crt)))

2320

1661

# Import the OpenPGP public key into the certificate

2321

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

2322

gnutls.OPENPGP_FMT_RAW)

1662

(gnutls.library.functions

1663

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

1664

gnutls.library.constants

1665

.GNUTLS_OPENPGP_FMT_RAW))

2323

1666

# Verify the self signature in the key

2324

1667

crtverify = ctypes.c_uint()

2325

gnutls.openpgp_crt_verify_self(crt, 0,

2326

ctypes.byref(crtverify))

1668

(gnutls.library.functions

1669

.gnutls_openpgp_crt_verify_self(crt, 0,

1670

ctypes.byref(crtverify)))

2327

1671

if crtverify.value != 0:

2328

gnutls.openpgp_crt_deinit(crt)

2329

raise gnutls.CertificateSecurityError("Verify failed")

1672

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1673

raise (gnutls.errors.CertificateSecurityError

1674

("Verify failed"))

2330

1675

# New buffer for the fingerprint

2331

1676

buf = ctypes.create_string_buffer(20)

2332

1677

buf_len = ctypes.c_size_t()

2333

1678

# Get the fingerprint from the certificate into the buffer

2334

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

2335

ctypes.byref(buf_len))

1679

(gnutls.library.functions

1680

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

1681

ctypes.byref(buf_len)))

2336

1682

# Deinit the certificate

2337

gnutls.openpgp_crt_deinit(crt)

1683

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2338

1684

# Convert the buffer to a Python bytestring

2339

1685

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

2340

1686

# Convert the bytestring to hexadecimal notation

2344

1690

2345

1691

class MultiprocessingMixIn(object):

2346

1692

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

2347

2348

1693

def sub_process_main(self, request, address):

2349

1694

try:

2350

1695

self.finish_request(request, address)

2355

1700

def process_request(self, request, address):

2356

1701

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

2357

1702

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

2358

args = (request, address))

1703

args = (request,

1704

address))

2359

1705

proc.start()

2360

1706

return proc

2361

1707

2362

1708

2363

1709

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

2364

1710

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

2365

2366

1711

def process_request(self, request, client_address):

2367

1712

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

2368

1713

2377

1722

2378

1723

def add_pipe(self, parent_pipe, proc):

2379

1724

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

2380

raise NotImplementedError()

1725

raise NotImplementedError

2381

1726

2382

1727

2383

1728

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

2389

1734

interface: None or a network interface name (string)

2390

1735

use_ipv6: Boolean; to use IPv6 or not

2391

1736

"""

2392

2393

1737

def __init__(self, server_address, RequestHandlerClass,

2394

interface=None,

2395

use_ipv6=True,

2396

socketfd=None):

2397

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

2398

creating a new one with socket.socket().

2399

"""

1738

interface=None, use_ipv6=True):

2400

1739

self.interface = interface

2401

1740

if use_ipv6:

2402

1741

self.address_family = socket.AF_INET6

2403

if socketfd is not None:

2404

# Save the file descriptor

2405

self.socketfd = socketfd

2406

# Save the original socket.socket() function

2407

self.socket_socket = socket.socket

2408

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

2409

#

2410

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

2411

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

2412

# patching socket.socket.)

2413

#

2414

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

2415

@functools.wraps(socket.socket)

2416

def socket_wrapper(*args, **kwargs):

2417

# Restore original function so subsequent calls are

2418

# not affected.

2419

socket.socket = self.socket_socket

2420

del self.socket_socket

2421

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

2422

# saved file descriptor.

2423

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

2424

# Replace socket.socket() function with wrapper

2425

socket.socket = socket_wrapper

2426

# The socketserver.TCPServer.__init__ will call

2427

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

2428

# socket_wrapper(), if socketfd was set.

2429

1742

socketserver.TCPServer.__init__(self, server_address,

2430

1743

RequestHandlerClass)

2431

2432

1744

def server_bind(self):

2433

1745

"""This overrides the normal server_bind() function

2434

1746

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

2440

1752

self.interface)

2441

1753

else:

2442

1754

try:

2443

self.socket.setsockopt(

2444

socket.SOL_SOCKET, SO_BINDTODEVICE,

2445

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

1755

self.socket.setsockopt(socket.SOL_SOCKET,

1756

SO_BINDTODEVICE,

1757

str(self.interface

1758

+ '\0'))

2446

1759

except socket.error as error:

2447

if error.errno == errno.EPERM:

2448

logger.error("No permission to bind to"

2449

" interface %s", self.interface)

2450

elif error.errno == errno.ENOPROTOOPT:

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:

2451

1765

logger.error("SO_BINDTODEVICE not available;"

2452

1766

" cannot bind to interface %s",

2453

1767

self.interface)

2454

elif error.errno == errno.ENODEV:

2455

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

2456

" cannot bind", self.interface)

2457

1768

else:

2458

1769

raise

2459

1770

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

2462

1773

if self.address_family == socket.AF_INET6:

2463

1774

any_address = "::" # in6addr_any

2464

1775

else:

2465

any_address = "0.0.0.0" # INADDR_ANY

1776

any_address = socket.INADDR_ANY

2466

1777

self.server_address = (any_address,

2467

1778

self.server_address[1])

2468

1779

elif not self.server_address[1]:

2469

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

1780

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

1781

0)

2470

1782

# if self.interface:

2471

1783

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

2472

1784

# 0, # port

2484

1796

gnutls_priority GnuTLS priority string

2485

1797

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

2486

1798

2487

Assumes a GLib.MainLoop event loop.

1799

Assumes a gobject.MainLoop event loop.

2488

1800

"""

2489

2490

1801

def __init__(self, server_address, RequestHandlerClass,

2491

interface=None,

2492

use_ipv6=True,

2493

clients=None,

2494

gnutls_priority=None,

2495

use_dbus=True,

2496

socketfd=None):

1802

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

1803

gnutls_priority=None, use_dbus=True):

2497

1804

self.enabled = False

2498

1805

self.clients = clients

2499

1806

if self.clients is None:

2503

1810

IPv6_TCPServer.__init__(self, server_address,

2504

1811

RequestHandlerClass,

2505

1812

interface = interface,

2506

use_ipv6 = use_ipv6,

2507

socketfd = socketfd)

2508

1813

use_ipv6 = use_ipv6)

2509

1814

def server_activate(self):

2510

1815

if self.enabled:

2511

1816

return socketserver.TCPServer.server_activate(self)

2515

1820

2516

1821

def add_pipe(self, parent_pipe, proc):

2517

1822

# Call "handle_ipc" for both data and EOF events

2518

GLib.io_add_watch(

2519

parent_pipe.fileno(),

2520

GLib.IO_IN | GLib.IO_HUP,

2521

functools.partial(self.handle_ipc,

2522

parent_pipe = parent_pipe,

2523

proc = proc))

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))

2524

1829

2525

def handle_ipc(self, source, condition,

2526

parent_pipe=None,

2527

proc = None,

2528

client_object=None):

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)

2529

1846

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

2530

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

1847

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

2531

1848

# Wait for other process to exit

2532

1849

proc.join()

2533

1850

return False

2540

1857

fpr = request[1]

2541

1858

address = request[2]

2542

1859

2543

for c in self.clients.values():

1860

for c in self.clients.itervalues():

2544

1861

if c.fingerprint == fpr:

2545

1862

client = c

2546

1863

break

2554

1871

parent_pipe.send(False)

2555

1872

return False

2556

1873

2557

GLib.io_add_watch(

2558

parent_pipe.fileno(),

2559

GLib.IO_IN | GLib.IO_HUP,

2560

functools.partial(self.handle_ipc,

2561

parent_pipe = parent_pipe,

2562

proc = proc,

2563

client_object = client))

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))

2564

1882

parent_pipe.send(True)

2565

1883

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

2566

1884

# same fileno

2572

1890

2573

1891

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

2574

1892

funcname)(*args,

2575

**kwargs)))

1893

**kwargs)))

2576

1894

2577

1895

if command == 'getattr':

2578

1896

attrname = request[1]

2579

if isinstance(client_object.__getattribute__(attrname),

2580

collections.Callable):

2581

parent_pipe.send(('function', ))

1897

if callable(client_object.__getattribute__(attrname)):

1898

parent_pipe.send(('function',))

2582

1899

else:

2583

parent_pipe.send((

2584

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

1900

parent_pipe.send(('data', client_object

1901

.__getattribute__(attrname)))

2585

1902

2586

1903

if command == 'setattr':

2587

1904

attrname = request[1]

2591

1908

return True

2592

1909

2593

1910

2594

def rfc3339_duration_to_delta(duration):

2595

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

2596

2597

>>> rfc3339_duration_to_delta("P7D")

2598

datetime.timedelta(7)

2599

>>> rfc3339_duration_to_delta("PT60S")

2600

datetime.timedelta(0, 60)

2601

>>> rfc3339_duration_to_delta("PT60M")

2602

datetime.timedelta(0, 3600)

2603

>>> rfc3339_duration_to_delta("PT24H")

2604

datetime.timedelta(1)

2605

>>> rfc3339_duration_to_delta("P1W")

2606

datetime.timedelta(7)

2607

>>> rfc3339_duration_to_delta("PT5M30S")

2608

datetime.timedelta(0, 330)

2609

>>> rfc3339_duration_to_delta("P1DT3M20S")

2610

datetime.timedelta(1, 200)

2611

"""

2612

2613

# Parsing an RFC 3339 duration with regular expressions is not

2614

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

2615

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

2616

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

2617

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

2618

# avoid excessive use of external libraries.

2619

2620

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

2621

Token = collections.namedtuple("Token", (

2622

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

2623

# a "group" containing digits

2624

"value", # datetime.timedelta or None

2625

"followers")) # Tokens valid after this token

2626

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

2627

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

2628

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

2629

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

2630

datetime.timedelta(seconds=1),

2631

frozenset((token_end, )))

2632

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

2633

datetime.timedelta(minutes=1),

2634

frozenset((token_second, token_end)))

2635

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

2636

datetime.timedelta(hours=1),

2637

frozenset((token_minute, token_end)))

2638

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

2639

None,

2640

frozenset((token_hour, token_minute,

2641

token_second)))

2642

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

2643

datetime.timedelta(days=1),

2644

frozenset((token_time, token_end)))

2645

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

2646

datetime.timedelta(weeks=4),

2647

frozenset((token_day, token_end)))

2648

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

2649

datetime.timedelta(weeks=52),

2650

frozenset((token_month, token_end)))

2651

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

2652

datetime.timedelta(weeks=1),

2653

frozenset((token_end, )))

2654

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

2655

frozenset((token_year, token_month,

2656

token_day, token_time,

2657

token_week)))

2658

# Define starting values

2659

value = datetime.timedelta() # Value so far

2660

found_token = None

2661

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

2662

s = duration # String left to parse

2663

# Loop until end token is found

2664

while found_token is not token_end:

2665

# Search for any currently valid tokens

2666

for token in followers:

2667

match = token.regexp.match(s)

2668

if match is not None:

2669

# Token found

2670

if token.value is not None:

2671

# Value found, parse digits

2672

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

2673

# Add to value so far

2674

value += factor * token.value

2675

# Strip token from string

2676

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

2677

# Go to found token

2678

found_token = token

2679

# Set valid next tokens

2680

followers = found_token.followers

2681

break

2682

else:

2683

# No currently valid tokens were found

2684

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

2685

.format(duration))

2686

# End token found

2687

return value

2688

2689

2690

1911

def string_to_delta(interval):

2691

1912

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

2692

1913

2703

1924

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

2704

1925

datetime.timedelta(0, 330)

2705

1926

"""

2706

2707

try:

2708

return rfc3339_duration_to_delta(interval)

2709

except ValueError:

2710

pass

2711

2712

1927

timevalue = datetime.timedelta(0)

2713

1928

for s in interval.split():

2714

1929

try:

2715

suffix = s[-1]

1930

suffix = unicode(s[-1])

2716

1931

value = int(s[:-1])

2717

1932

if suffix == "d":

2718

1933

delta = datetime.timedelta(value)

2725

1940

elif suffix == "w":

2726

1941

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

2727

1942

else:

2728

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

2729

except IndexError as e:

1943

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

1944

except (ValueError, IndexError) as e:

2730

1945

raise ValueError(*(e.args))

2731

1946

timevalue += delta

2732

1947

return timevalue

2745

1960

sys.exit()

2746

1961

if not noclose:

2747

1962

# Close all standard open file descriptors

2748

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

1963

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

2749

1964

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

2750

1965

raise OSError(errno.ENODEV,

2751

"{} not a character device"

2752

.format(os.devnull))

1966

"%s not a character device"

1967

% os.path.devnull)

2753

1968

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

2754

1969

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

2755

1970

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

2764

1979

2765

1980

parser = argparse.ArgumentParser()

2766

1981

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

2767

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

1982

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

2768

1983

help="show version number and exit")

2769

1984

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

2770

1985

help="Bind to interface IF")

2776

1991

help="Run self-test")

2777

1992

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

2778

1993

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

2779

" to terminal", default=None)

1994

" to terminal")

2780

1995

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

2781

1996

help="Debug level for stdout output")

2782

1997

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

2789

2004

" files")

2790

2005

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

2791

2006

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

2792

" system bus interface", default=None)

2007

" system bus interface")

2793

2008

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

2794

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

2795

default=None)

2009

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

2796

2010

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

2797

2011

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

2798

" state", default=None)

2799

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

2800

help="Specify a file descriptor to a network"

2801

" socket to use instead of creating one")

2012

" state")

2802

2013

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

2803

2014

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

2804

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

2805

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

2806

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

2807

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

2808

default=None)

2809

2015

2810

2016

options = parser.parse_args()

2811

2017

2812

2018

if options.check:

2813

2019

import doctest

2814

fail_count, test_count = doctest.testmod()

2815

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

2020

doctest.testmod()

2021

sys.exit()

2816

2022

2817

2023

# Default values for config file for server-global settings

2818

2024

server_defaults = { "interface": "",

2820

2026

"port": "",

2821

2027

"debug": "False",

2822

2028

"priority":

2823

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

2824

":+SIGN-DSA-SHA256",

2029

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

2825

2030

"servicename": "Mandos",

2826

2031

"use_dbus": "True",

2827

2032

"use_ipv6": "True",

2828

2033

"debuglevel": "",

2829

2034

"restore": "True",

2830

"socket": "",

2831

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

2832

"foreground": "False",

2833

"zeroconf": "True",

2834

}

2035

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

2036

}

2835

2037

2836

2038

# Parse config file for server-global settings

2837

2039

server_config = configparser.SafeConfigParser(server_defaults)

2838

2040

del server_defaults

2839

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

2041

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

2042

"mandos.conf"))

2840

2043

# Convert the SafeConfigParser object to a dict

2841

2044

server_settings = server_config.defaults()

2842

2045

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

2843

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

2046

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

2844

2047

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

2845

2048

option)

2846

2049

if server_settings["port"]:

2847

2050

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

2848

2051

"port")

2849

if server_settings["socket"]:

2850

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

2851

"socket")

2852

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

2853

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

2854

# happen with a supplied network socket.

2855

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

2856

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

2857

["socket"])

2858

2052

del server_config

2859

2053

2860

2054

# Override the settings from the config file with command line

2861

2055

# options, if set.

2862

2056

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

2863

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

2864

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

2865

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

2057

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

2058

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

2059

"statedir"):

2866

2060

value = getattr(options, option)

2867

2061

if value is not None:

2868

2062

server_settings[option] = value

2869

2063

del options

2870

2064

# Force all strings to be unicode

2871

2065

for option in server_settings.keys():

2872

if isinstance(server_settings[option], bytes):

2873

server_settings[option] = (server_settings[option]

2874

.decode("utf-8"))

2875

# Force all boolean options to be boolean

2876

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

2877

"foreground", "zeroconf"):

2878

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

2879

# Debug implies foreground

2880

if server_settings["debug"]:

2881

server_settings["foreground"] = True

2066

if type(server_settings[option]) is str:

2067

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

2882

2068

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

2883

2069

2884

2070

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

2885

2071

2886

if (not server_settings["zeroconf"]

2887

and not (server_settings["port"]

2888

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

2889

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

2890

2891

2072

# For convenience

2892

2073

debug = server_settings["debug"]

2893

2074

debuglevel = server_settings["debuglevel"]

2895

2076

use_ipv6 = server_settings["use_ipv6"]

2896

2077

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

2897

2078

stored_state_file)

2898

foreground = server_settings["foreground"]

2899

zeroconf = server_settings["zeroconf"]

2900

2079

2901

2080

if debug:

2902

initlogger(debug, logging.DEBUG)

2081

initlogger(logging.DEBUG)

2903

2082

else:

2904

2083

if not debuglevel:

2905

initlogger(debug)

2084

initlogger()

2906

2085

else:

2907

2086

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

2908

initlogger(debug, level)

2087

initlogger(level)

2909

2088

2910

2089

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

2911

syslogger.setFormatter(

2912

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

2913

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

2914

server_settings["servicename"])))

2090

syslogger.setFormatter(logging.Formatter

2091

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

2092

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

2093

% server_settings["servicename"]))

2915

2094

2916

2095

# Parse config file with clients

2917

client_config = configparser.SafeConfigParser(Client

2918

.client_defaults)

2096

client_config = configparser.SafeConfigParser(Client.client_defaults)

2919

2097

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

2920

2098

"clients.conf"))

2921

2099

2922

2100

global mandos_dbus_service

2923

2101

mandos_dbus_service = None

2924

2102

2925

socketfd = None

2926

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

2927

socketfd = server_settings["socket"]

2928

tcp_server = MandosServer(

2929

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

2930

ClientHandler,

2931

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

2932

use_ipv6=use_ipv6,

2933

gnutls_priority=server_settings["priority"],

2934

use_dbus=use_dbus,

2935

socketfd=socketfd)

2936

if not foreground:

2937

pidfilename = "/run/mandos.pid"

2938

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

2939

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

2940

pidfile = None

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"

2941

2114

try:

2942

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

2943

except IOError as e:

2944

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

2945

exc_info=e)

2115

pidfile = open(pidfilename, "w")

2116

except IOError:

2117

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

2946

2118

2947

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

2948

("mandos", "mandos"),

2949

("nobody", "nogroup")):

2119

try:

2120

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

2121

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

2122

except KeyError:

2950

2123

try:

2951

uid = pwd.getpwnam(name).pw_uid

2952

gid = pwd.getpwnam(group).pw_gid

2953

break

2124

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

2125

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

2954

2126

except KeyError:

2955

continue

2956

else:

2957

uid = 65534

2958

gid = 65534

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

2959

2133

try:

2960

2134

os.setgid(gid)

2961

2135

os.setuid(uid)

2962

if debug:

2963

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

2964

gid))

2965

2136

except OSError as error:

2966

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

2967

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

2968

if error.errno != errno.EPERM:

2969

raise

2137

if error[0] != errno.EPERM:

2138

raise error

2970

2139

2971

2140

if debug:

2972

2141

# Enable all possible GnuTLS debugging

2973

2142

2974

2143

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

2975

2144

# - GnuTLS manual

2976

gnutls.global_set_log_level(11)

2145

gnutls.library.functions.gnutls_global_set_log_level(11)

2977

2146

2978

@gnutls.log_func

2147

@gnutls.library.types.gnutls_log_func

2979

2148

def debug_gnutls(level, string):

2980

2149

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

2981

2150

2982

gnutls.global_set_log_function(debug_gnutls)

2151

(gnutls.library.functions

2152

.gnutls_global_set_log_function(debug_gnutls))

2983

2153

2984

2154

# Redirect stdin so all checkers get /dev/null

2985

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

2155

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

2986

2156

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

2987

2157

if null > 2:

2988

2158

os.close(null)

2159

else:

2160

# No console logging

2161

logger.removeHandler(console)

2989

2162

2990

2163

# Need to fork before connecting to D-Bus

2991

if not foreground:

2164

if not debug:

2992

2165

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

2993

2166

daemon()

2994

2167

2995

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

2996

# to inform GLib that threads will be used.

2997

GLib.threads_init()

2998

2999

2168

global main_loop

3000

2169

# From the Avahi example code

3001

DBusGMainLoop(set_as_default=True)

3002

main_loop = GLib.MainLoop()

2170

DBusGMainLoop(set_as_default=True )

2171

main_loop = gobject.MainLoop()

3003

2172

bus = dbus.SystemBus()

3004

2173

# End of Avahi example code

3005

2174

if use_dbus:

3006

2175

try:

3007

2176

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

3008

bus,

3009

do_not_queue=True)

3010

old_bus_name = dbus.service.BusName(

3011

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

3012

do_not_queue=True)

3013

except dbus.exceptions.DBusException as e:

3014

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

2177

bus, do_not_queue=True)

2178

old_bus_name = (dbus.service.BusName

2179

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

2180

do_not_queue=True))

2181

except dbus.exceptions.NameExistsException as e:

2182

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

3015

2183

use_dbus = False

3016

2184

server_settings["use_dbus"] = False

3017

2185

tcp_server.use_dbus = False

3018

if zeroconf:

3019

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

3020

service = AvahiServiceToSyslog(

3021

name = server_settings["servicename"],

3022

servicetype = "_mandos._tcp",

3023

protocol = protocol,

3024

bus = bus)

3025

if server_settings["interface"]:

3026

service.interface = if_nametoindex(

3027

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

2186

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2187

service = AvahiServiceToSyslog(name =

2188

server_settings["servicename"],

2189

servicetype = "_mandos._tcp",

2190

protocol = protocol, bus = bus)

2191

if server_settings["interface"]:

2192

service.interface = (if_nametoindex

2193

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

3028

2194

3029

2195

global multiprocessing_manager

3030

2196

multiprocessing_manager = multiprocessing.Manager()

3031

2197

3032

2198

client_class = Client

3033

2199

if use_dbus:

3034

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

2200

client_class = functools.partial(ClientDBusTransitional,

2201

bus = bus)

3035

2202

3036

2203

client_settings = Client.config_parser(client_config)

3037

2204

old_client_settings = {}

3038

2205

clients_data = {}

3039

2206

3040

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

3041

global wnull

3042

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

3043

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

3044

# mode

3045

if debug or not foreground:

3046

wnull.close()

3047

3048

2207

# Get client data and settings from last running state.

3049

2208

if server_settings["restore"]:

3050

2209

try:

3051

2210

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

3052

if sys.version_info.major == 2:

3053

clients_data, old_client_settings = pickle.load(

3054

stored_state)

3055

else:

3056

bytes_clients_data, bytes_old_client_settings = (

3057

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

3058

### Fix bytes to strings

3059

## clients_data

3060

# .keys()

3061

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

3062

if isinstance(key, bytes)

3063

else key): value

3064

for key, value in

3065

bytes_clients_data.items() }

3066

del bytes_clients_data

3067

for key in clients_data:

3068

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

3069

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

3070

for k, v in

3071

clients_data[key].items() }

3072

clients_data[key] = value

3073

# .client_structure

3074

value["client_structure"] = [

3075

(s.decode("utf-8")

3076

if isinstance(s, bytes)

3077

else s) for s in

3078

value["client_structure"] ]

3079

# .name & .host

3080

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

3081

if isinstance(value[k], bytes):

3082

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

3083

## old_client_settings

3084

# .keys()

3085

old_client_settings = {

3086

(key.decode("utf-8")

3087

if isinstance(key, bytes)

3088

else key): value

3089

for key, value in

3090

bytes_old_client_settings.items() }

3091

del bytes_old_client_settings

3092

# .host

3093

for value in old_client_settings.values():

3094

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

3095

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

3096

.decode("utf-8"))

2211

clients_data, old_client_settings = (pickle.load

2212

(stored_state))

3097

2213

os.remove(stored_state_path)

3098

2214

except IOError as e:

3099

if e.errno == errno.ENOENT:

3100

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

3101

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

3102

else:

3103

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

3104

exc_info=e)

2215

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

2216

.format(e))

2217

if e.errno != errno.ENOENT:

3105

2218

raise

3106

except EOFError as e:

3107

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

3108

"EOFError:",

3109

exc_info=e)

3110

2219

3111

2220

with PGPEngine() as pgp:

3112

for client_name, client in clients_data.items():

3113

# Skip removed clients

3114

if client_name not in client_settings:

3115

continue

3116

2221

for client_name, client in clients_data.iteritems():

3117

2222

# Decide which value to use after restoring saved state.

3118

2223

# We have three different values: Old config file,

3119

2224

# new config file, and saved state.

3124

2229

# For each value in new config, check if it

3125

2230

# differs from the old config value (Except for

3126

2231

# the "secret" attribute)

3127

if (name != "secret"

3128

and (value !=

3129

old_client_settings[client_name][name])):

2232

if (name != "secret" and

2233

value != old_client_settings[client_name]

2234

[name]):

3130

2235

client[name] = value

3131

2236

except KeyError:

3132

2237

pass

3133

2238

3134

2239

# Clients who has passed its expire date can still be

3135

# enabled if its last checker was successful. A Client

3136

# whose checker succeeded before we stored its state is

3137

# assumed to have successfully run all checkers during

3138

# downtime.

2240

# enabled if its last checker was successful. Clients

2241

# whose checker failed before we stored its state is

2242

# assumed to have failed all checkers during downtime.

3139

2243

if client["enabled"]:

3140

2244

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

3141

2245

if not client["last_checked_ok"]:

3142

2246

logger.warning(

3143

"disabling client {} - Client never "

3144

"performed a successful checker".format(

3145

client_name))

2247

"disabling client {0} - Client never "

2248

"performed a successfull checker"

2249

.format(client["name"]))

3146

2250

client["enabled"] = False

3147

2251

elif client["last_checker_status"] != 0:

3148

2252

logger.warning(

3149

"disabling client {} - Client last"

3150

" checker failed with error code"

3151

" {}".format(

3152

client_name,

3153

client["last_checker_status"]))

2253

"disabling client {0} - Client "

2254

"last checker failed with error code {1}"

2255

.format(client["name"],

2256

client["last_checker_status"]))

3154

2257

client["enabled"] = False

3155

2258

else:

3156

client["expires"] = (

3157

datetime.datetime.utcnow()

3158

+ client["timeout"])

3159

logger.debug("Last checker succeeded,"

3160

" keeping {} enabled".format(

3161

client_name))

2259

client["expires"] = (datetime.datetime

2260

.utcnow()

2261

+ client["timeout"])

2262

3162

2263

try:

3163

client["secret"] = pgp.decrypt(

3164

client["encrypted_secret"],

3165

client_settings[client_name]["secret"])

2264

client["secret"] = (

2265

pgp.decrypt(client["encrypted_secret"],

2266

client_settings[client_name]

2267

["secret"]))

3166

2268

except PGPError:

3167

2269

# If decryption fails, we use secret from new settings

3168

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

3169

client_name))

3170

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

3171

["secret"])

2270

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

2271

.format(client_name))

2272

client["secret"] = (

2273

client_settings[client_name]["secret"])

2274

3172

2275

3173

2276

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

3174

for client_name in (set(old_client_settings)

3175

- set(client_settings)):

2277

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

3176

2278

del clients_data[client_name]

3177

for client_name in (set(client_settings)

3178

- set(old_client_settings)):

2279

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

3179

2280

clients_data[client_name] = client_settings[client_name]

3180

3181

# Create all client objects

3182

for client_name, client in clients_data.items():

2281

2282

# Create clients all clients

2283

for client_name, client in clients_data.iteritems():

3183

2284

tcp_server.clients[client_name] = client_class(

3184

name = client_name,

3185

settings = client,

3186

server_settings = server_settings)

2285

name = client_name, settings = client)

3187

2286

3188

2287

if not tcp_server.clients:

3189

2288

logger.warning("No clients defined")

3190

3191

if not foreground:

3192

if pidfile is not None:

3193

pid = os.getpid()

3194

try:

3195

with pidfile:

3196

print(pid, file=pidfile)

3197

except IOError:

3198

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

3199

pidfilename, pid)

3200

del pidfile

2289

2290

if not debug:

2291

try:

2292

with pidfile:

2293

pid = os.getpid()

2294

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

2295

del pidfile

2296

except IOError:

2297

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

2298

pidfilename, pid)

2299

except NameError:

2300

# "pidfile" was never created

2301

pass

3201

2302

del pidfilename

2303

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

3202

2304

3203

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

3204

GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,

3205

lambda: main_loop.quit() and False)

2305

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

2306

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

3206

2307

3207

2308

if use_dbus:

3208

3209

@alternate_dbus_interfaces(

3210

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

3211

class MandosDBusService(DBusObjectWithObjectManager):

2309

class MandosDBusService(dbus.service.Object):

3212

2310

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

3213

3214

2311

def __init__(self):

3215

2312

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

3216

3217

2313

_interface = "se.recompile.Mandos"

3218

2314

3219

2315

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

3226

2322

"D-Bus signal"

3227

2323

pass

3228

2324

3229

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

3230

"true"})

3231

2325

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

3232

2326

def ClientRemoved(self, objpath, name):

3233

2327

"D-Bus signal"

3234

2328

pass

3235

2329

3236

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

3237

"true"})

3238

2330

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

3239

2331

def GetAllClients(self):

3240

2332

"D-Bus method"

3241

return dbus.Array(c.dbus_object_path for c in

3242

tcp_server.clients.values())

2333

return dbus.Array(c.dbus_object_path

2334

for c in

2335

tcp_server.clients.itervalues())

3243

2336

3244

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

3245

"true"})

3246

2337

@dbus.service.method(_interface,

3247

2338

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

3248

2339

def GetAllClientsWithProperties(self):

3249

2340

"D-Bus method"

3250

2341

return dbus.Dictionary(

3251

{ c.dbus_object_path: c.GetAll(

3252

"se.recompile.Mandos.Client")

3253

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

2342

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

2343

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

3254

2344

signature="oa{sv}")

3255

2345

3256

2346

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

3257

2347

def RemoveClient(self, object_path):

3258

2348

"D-Bus method"

3259

for c in tcp_server.clients.values():

2349

for c in tcp_server.clients.itervalues():

3260

2350

if c.dbus_object_path == object_path:

3261

2351

del tcp_server.clients[c.name]

3262

2352

c.remove_from_connection()

3263

# Don't signal the disabling

2353

# Don't signal anything except ClientRemoved

3264

2354

c.disable(quiet=True)

3265

# Emit D-Bus signal for removal

3266

self.client_removed_signal(c)

2355

# Emit D-Bus signal

2356

self.ClientRemoved(object_path, c.name)

3267

2357

return

3268

2358

raise KeyError(object_path)

3269

2359

3270

2360

del _interface

3271

3272

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

3273

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

3274

def GetManagedObjects(self):

3275

"""D-Bus method"""

3276

return dbus.Dictionary(

3277

{ client.dbus_object_path:

3278

dbus.Dictionary(

3279

{ interface: client.GetAll(interface)

3280

for interface in

3281

client._get_all_interface_names()})

3282

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

3283

3284

def client_added_signal(self, client):

3285

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

3286

if use_dbus:

3287

# New standard signal

3288

self.InterfacesAdded(

3289

client.dbus_object_path,

3290

dbus.Dictionary(

3291

{ interface: client.GetAll(interface)

3292

for interface in

3293

client._get_all_interface_names()}))

3294

# Old signal

3295

self.ClientAdded(client.dbus_object_path)

3296

3297

def client_removed_signal(self, client):

3298

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

3299

if use_dbus:

3300

# New standard signal

3301

self.InterfacesRemoved(

3302

client.dbus_object_path,

3303

client._get_all_interface_names())

3304

# Old signal

3305

self.ClientRemoved(client.dbus_object_path,

3306

client.name)

3307

2361

3308

mandos_dbus_service = MandosDBusService()

2362

class MandosDBusServiceTransitional(MandosDBusService):

2363

__metaclass__ = AlternateDBusNamesMetaclass

2364

mandos_dbus_service = MandosDBusServiceTransitional()

3309

2365

3310

2366

def cleanup():

3311

2367

"Cleanup function; run on exit"

3312

if zeroconf:

3313

service.cleanup()

2368

service.cleanup()

3314

2369

3315

2370

multiprocessing.active_children()

3316

wnull.close()

3317

2371

if not (tcp_server.clients or client_settings):

3318

2372

return

3319

2373

3322

2376

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

3323

2377

clients = {}

3324

2378

with PGPEngine() as pgp:

3325

for client in tcp_server.clients.values():

2379

for client in tcp_server.clients.itervalues():

3326

2380

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

3327

2381

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

3328

2382

key)

3330

2384

3331

2385

# A list of attributes that can not be pickled

3332

2386

# + secret.

3333

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

3334

"checker", "server_settings" }

3335

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

3336

.Object):

2387

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

2388

"checker"))

2389

for name, typ in (inspect.getmembers

2390

(dbus.service.Object)):

3337

2391

exclude.add(name)

3338

2392

3339

2393

client_dict["encrypted_secret"] = (client

3346

2400

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

3347

2401

3348

2402

try:

3349

with tempfile.NamedTemporaryFile(

3350

mode='wb',

3351

suffix=".pickle",

3352

prefix='clients-',

3353

dir=os.path.dirname(stored_state_path),

3354

delete=False) as stored_state:

3355

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

3356

protocol = 2)

3357

tempname = stored_state.name

3358

os.rename(tempname, stored_state_path)

2403

with os.fdopen(os.open(stored_state_path,

2404

os.O_CREAT|os.O_WRONLY|os.O_TRUNC,

2405

0600), "wb") as stored_state:

2406

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

3359

2407

except (IOError, OSError) as e:

3360

if not debug:

3361

try:

3362

os.remove(tempname)

3363

except NameError:

3364

pass

3365

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

3366

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

3367

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

3368

else:

3369

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

3370

exc_info=e)

2408

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

2409

.format(e))

2410

if e.errno not in (errno.ENOENT, errno.EACCES):

3371

2411

raise

3372

2412

3373

2413

# Delete all clients, and settings from config

3375

2415

name, client = tcp_server.clients.popitem()

3376

2416

if use_dbus:

3377

2417

client.remove_from_connection()

3378

# Don't signal the disabling

2418

# Don't signal anything except ClientRemoved

3379

2419

client.disable(quiet=True)

3380

# Emit D-Bus signal for removal

3381

2420

if use_dbus:

3382

mandos_dbus_service.client_removed_signal(client)

2421

# Emit D-Bus signal

2422

mandos_dbus_service.ClientRemoved(client

2423

.dbus_object_path,

2424

client.name)

3383

2425

client_settings.clear()

3384

2426

3385

2427

atexit.register(cleanup)

3386

2428

3387

for client in tcp_server.clients.values():

2429

for client in tcp_server.clients.itervalues():

3388

2430

if use_dbus:

3389

# Emit D-Bus signal for adding

3390

mandos_dbus_service.client_added_signal(client)

2431

# Emit D-Bus signal

2432

mandos_dbus_service.ClientAdded(client.dbus_object_path)

3391

2433

# Need to initiate checking of clients

3392

2434

if client.enabled:

3393

2435

client.init_checker()

3396

2438

tcp_server.server_activate()

3397

2439

3398

2440

# Find out what port we got

3399

if zeroconf:

3400

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

2441

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

3401

2442

if use_ipv6:

3402

2443

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

3403

" flowinfo %d, scope_id %d",

3404

*tcp_server.socket.getsockname())

2444

" flowinfo %d, scope_id %d"

2445

% tcp_server.socket.getsockname())

3405

2446

else: # IPv4

3406

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

3407

*tcp_server.socket.getsockname())

2447

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

2448

% tcp_server.socket.getsockname())

3408

2449

3409

2450

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

3410

2451

3411

2452

try:

3412

if zeroconf:

3413

# From the Avahi example code

3414

try:

3415

service.activate()

3416

except dbus.exceptions.DBusException as error:

3417

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

3418

cleanup()

3419

sys.exit(1)

3420

# End of Avahi example code

2453

# From the Avahi example code

2454

try:

2455

service.activate()

2456

except dbus.exceptions.DBusException as error:

2457

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

2458

cleanup()

2459

sys.exit(1)

2460

# End of Avahi example code

3421

2461

3422

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

3423

lambda *args, **kwargs:

3424

(tcp_server.handle_request

3425

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

2462

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

2463

lambda *args, **kwargs:

2464

(tcp_server.handle_request

2465

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

3426

2466

3427

2467

logger.debug("Starting main loop")

3428

2468

main_loop.run()

3429

2469

except AvahiError as error:

3430

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

2470

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

3431

2471

cleanup()

3432

2472

sys.exit(1)

3433

2473

except KeyboardInterrupt:

3438

2478

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

3439

2479

cleanup()

3440

2480

3441

3442

2481

if __name__ == '__main__':

3443

2482

main()