/mandos/trunk : revision 748

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#!/usr/bin/python

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#!/usr/bin/python2.7

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

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#

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

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

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#

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# Everything else is

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#

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

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

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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try:

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from future_builtins import *

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except ImportError:

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pass

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from future_builtins import *

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try:

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import SocketServer as socketserver

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except ImportError:

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import socketserver

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import 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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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 = "1.6.9"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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return interface_index

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def copy_function(func):

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

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if sys.version_info.major == 2:

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return types.FunctionType(func.func_code,

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func.func_globals,

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func.func_name,

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func.func_defaults,

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func.func_closure)

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else:

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return types.FunctionType(func.__code__,

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func.__globals__,

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func.__name__,

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func.__defaults__,

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func.__closure__)

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

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"""init logger and add loglevel"""

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def __init__(self):

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

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self.gpg = "gpg"

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try:

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

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for line in output.splitlines():

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

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if name == "gpg":

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self.gpg = path

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break

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except OSError as e:

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if e.errno != errno.ENOENT:

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raise

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self.gnupgargs = ['--batch',

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'--homedir', self.tempdir,

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'--home', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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raise PGPError(err)

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return decrypted_plaintext

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# Pretend that we have an Avahi module

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class Avahi(object):

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

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

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

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

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PROTO_INET = 0 # avahi-common/address.h

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PROTO_INET6 = 1 # avahi-common/address.h

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DBUS_NAME = "org.freedesktop.Avahi"

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DBUS_INTERFACE_ENTRY_GROUP = DBUS_NAME + ".EntryGroup"

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DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"

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DBUS_PATH_SERVER = "/"

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def string_array_to_txt_array(self, t):

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

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

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ENTRY_GROUP_ESTABLISHED = 2 # avahi-common/defs.h

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ENTRY_GROUP_COLLISION = 3 # avahi-common/defs.h

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ENTRY_GROUP_FAILURE = 4 # avahi-common/defs.h

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SERVER_INVALID = 0 # avahi-common/defs.h

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SERVER_REGISTERING = 1 # avahi-common/defs.h

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SERVER_RUNNING = 2 # avahi-common/defs.h

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SERVER_COLLISION = 3 # avahi-common/defs.h

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SERVER_FAILURE = 4 # avahi-common/defs.h

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avahi = Avahi()

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class AvahiError(Exception):

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

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

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self.cleanup()

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elif state == avahi.SERVER_RUNNING:

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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if (error.get_dbus_name()

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

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logger.info("Local Zeroconf service name"

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" collision.")

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return self.rename(remove=False)

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else:

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

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self.cleanup()

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os._exit(1)

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self.add()

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else:

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if error is None:

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

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.format(self.name)))

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return ret

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# Pretend that we have a GnuTLS module

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class GnuTLS(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 a GnuTLS module."""

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_library = ctypes.cdll.LoadLibrary(

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ctypes.util.find_library("gnutls"))

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_need_version = b"3.3.0"

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def __init__(self):

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

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

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# happens.

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

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

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.format(self._need_version))

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# Unless otherwise indicated, the constants and types below are

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

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# Constants

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E_SUCCESS = 0

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E_INTERRUPTED = -52

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E_AGAIN = -28

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CRT_OPENPGP = 2

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CLIENT = 2

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SHUT_RDWR = 0

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CRD_CERTIFICATE = 1

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E_NO_CERTIFICATE_FOUND = -49

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OPENPGP_FMT_RAW = 0 # gnutls/openpgp.h

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# Types

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class session_int(ctypes.Structure):

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_fields_ = []

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session_t = ctypes.POINTER(session_int)

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class certificate_credentials_st(ctypes.Structure):

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_fields_ = []

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certificate_credentials_t = ctypes.POINTER(

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certificate_credentials_st)

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certificate_type_t = ctypes.c_int

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class datum_t(ctypes.Structure):

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

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('size', ctypes.c_uint)]

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class openpgp_crt_int(ctypes.Structure):

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_fields_ = []

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openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)

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openpgp_crt_fmt_t = ctypes.c_int # gnutls/openpgp.h

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

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credentials_type_t = ctypes.c_int

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transport_ptr_t = ctypes.c_void_p

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close_request_t = ctypes.c_int

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# Exceptions

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class Error(Exception):

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

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# exception might be raised from within GnuTLS.__init__,

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

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# global variable has happened.

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

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

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# code is passed, convert it to a string with

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# gnutls.strerror()

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self.code = code

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if message is None and code is not None:

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message = GnuTLS.strerror(code)

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

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message, *args)

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class CertificateSecurityError(Error):

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pass

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# Classes

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class Credentials(object):

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def __init__(self):

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self._c_object = gnutls.certificate_credentials_t()

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gnutls.certificate_allocate_credentials(

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ctypes.byref(self._c_object))

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self.type = gnutls.CRD_CERTIFICATE

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def __del__(self):

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gnutls.certificate_free_credentials(self._c_object)

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class ClientSession(object):

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

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self._c_object = gnutls.session_t()

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

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gnutls.set_default_priority(self._c_object)

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

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gnutls.handshake_set_private_extensions(self._c_object,

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True)

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self.socket = socket

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if credentials is None:

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credentials = gnutls.Credentials()

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

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ctypes.cast(credentials._c_object,

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ctypes.c_void_p))

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self.credentials = credentials

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def __del__(self):

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gnutls.deinit(self._c_object)

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def handshake(self):

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return gnutls.handshake(self._c_object)

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def send(self, data):

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data = bytes(data)

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data_len = len(data)

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while data_len > 0:

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data_len -= gnutls.record_send(self._c_object,

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data[-data_len:],

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data_len)

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def bye(self):

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

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# Error handling functions

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def _error_code(result):

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

599

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

600

if result >= 0:

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return result

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if result == gnutls.E_NO_CERTIFICATE_FOUND:

603

raise gnutls.CertificateSecurityError(code = result)

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raise gnutls.Error(code = result)

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def _retry_on_error(result, func, arguments):

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

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

609

while result < 0:

610

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

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return _error_code(result)

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result = func(*arguments)

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return result

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# Unless otherwise indicated, the function declarations below are

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

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# Functions

619

priority_set_direct = _library.gnutls_priority_set_direct

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priority_set_direct.argtypes = [session_t, ctypes.c_char_p,

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ctypes.POINTER(ctypes.c_char_p)]

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priority_set_direct.restype = _error_code

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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

414

747

415

class Client(object):

748

416

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

754

422

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

755

423

to see if the client lives.

756

424

'None' if no process is running.

757

checker_callback_tag: a GLib event source tag, or None

425

checker_callback_tag: a gobject event source tag, or None

758

426

checker_command: string; External command which is run to check

759

427

if client lives. %() expansions are done at

760

428

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

761

429

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

762

checker_initiator_tag: a GLib event source tag, or None

430

checker_initiator_tag: a gobject event source tag, or None

763

431

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

764

432

client_structure: Object describing what attributes a client has

765

433

and is used for storing the client at exit

766

434

current_checker_command: string; current running checker_command

767

disable_initiator_tag: a GLib event source tag, or None

435

disable_initiator_tag: a gobject event source tag, or None

768

436

enabled: bool()

769

437

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

770

438

uniquely identify the client

775

443

last_checker_status: integer between 0 and 255 reflecting exit

776

444

status of last checker. -1 reflects crashed

777

445

checker, -2 means no checker completed yet.

778

last_checker_signal: The signal which killed the last checker, if

779

last_checker_status is -1

780

446

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

781

447

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

782

448

D-Bus identifiers

833

499

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

834

500

.replace(" ", ""))

835

501

if "secret" in section:

836

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

837

.encode("utf-8"),

838

"base64")

502

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

839

503

elif "secfile" in section:

840

504

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

841

505

(section["secfile"])),

894

558

self.changedstate = multiprocessing_manager.Condition(

895

559

multiprocessing_manager.Lock())

896

560

self.client_structure = [attr

897

for attr in self.__dict__.keys()

561

for attr in self.__dict__.iterkeys()

898

562

if not attr.startswith("_")]

899

563

self.client_structure.append("client_structure")

900

564

926

590

if not quiet:

927

591

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

928

592

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

929

GLib.source_remove(self.disable_initiator_tag)

593

gobject.source_remove(self.disable_initiator_tag)

930

594

self.disable_initiator_tag = None

931

595

self.expires = None

932

596

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

933

GLib.source_remove(self.checker_initiator_tag)

597

gobject.source_remove(self.checker_initiator_tag)

934

598

self.checker_initiator_tag = None

935

599

self.stop_checker()

936

600

self.enabled = False

937

601

if not quiet:

938

602

self.send_changedstate()

939

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

603

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

940

604

return False

941

605

942

606

def __del__(self):

946

610

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

947

611

# and every interval from then on.

948

612

if self.checker_initiator_tag is not None:

949

GLib.source_remove(self.checker_initiator_tag)

950

self.checker_initiator_tag = GLib.timeout_add(

613

gobject.source_remove(self.checker_initiator_tag)

614

self.checker_initiator_tag = gobject.timeout_add(

951

615

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

952

616

self.start_checker)

953

617

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

954

618

if self.disable_initiator_tag is not None:

955

GLib.source_remove(self.disable_initiator_tag)

956

self.disable_initiator_tag = GLib.timeout_add(

619

gobject.source_remove(self.disable_initiator_tag)

620

self.disable_initiator_tag = gobject.timeout_add(

957

621

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

958

622

# Also start a new checker *right now*.

959

623

self.start_checker()

960

624

961

def checker_callback(self, source, condition, connection,

962

command):

625

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

963

626

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

964

627

self.checker_callback_tag = None

965

628

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

629

if os.WIFEXITED(condition):

630

self.last_checker_status = os.WEXITSTATUS(condition)

973

631

if self.last_checker_status == 0:

974

632

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

975

633

vars(self))

978

636

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

979

637

else:

980

638

self.last_checker_status = -1

981

self.last_checker_signal = -returncode

982

639

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

983

640

vars(self))

984

return False

985

641

986

642

def checked_ok(self):

987

643

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

988

644

self.last_checked_ok = datetime.datetime.utcnow()

989

645

self.last_checker_status = 0

990

self.last_checker_signal = None

991

646

self.bump_timeout()

992

647

993

648

def bump_timeout(self, timeout=None):

995

650

if timeout is None:

996

651

timeout = self.timeout

997

652

if self.disable_initiator_tag is not None:

998

GLib.source_remove(self.disable_initiator_tag)

653

gobject.source_remove(self.disable_initiator_tag)

999

654

self.disable_initiator_tag = None

1000

655

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

1001

self.disable_initiator_tag = GLib.timeout_add(

656

self.disable_initiator_tag = gobject.timeout_add(

1002

657

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

1003

658

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

1004

659

1019

674

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

1020

675

# should be.

1021

676

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

677

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

678

try:

679

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

680

except AttributeError:

681

pass

682

except OSError as error:

683

if error.errno != errno.ECHILD:

684

raise

685

else:

686

if pid:

687

logger.warning("Checker was a zombie")

688

gobject.source_remove(self.checker_callback_tag)

689

self.checker_callback(pid, status,

690

self.current_checker_command)

1026

691

# Start a new checker if needed

1027

692

if self.checker is None:

1028

693

# Escape attributes for the shell

1037

702

exc_info=error)

1038

703

return True # Try again later

1039

704

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

705

try:

706

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

707

self.name)

708

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

709

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

710

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

711

# always replaced by /dev/null.)

712

# The exception is when not debugging but nevertheless

713

# running in the foreground; use the previously

714

# created wnull.

715

popen_args = {}

716

if (not self.server_settings["debug"]

717

and self.server_settings["foreground"]):

718

popen_args.update({"stdout": wnull,

719

"stderr": wnull })

720

self.checker = subprocess.Popen(command,

721

close_fds=True,

722

shell=True,

723

cwd="/",

724

**popen_args)

725

except OSError as error:

726

logger.error("Failed to start subprocess",

727

exc_info=error)

728

return True

729

self.checker_callback_tag = gobject.child_watch_add(

730

self.checker.pid, self.checker_callback, data=command)

731

# The checker may have completed before the gobject

732

# watch was added. Check for this.

733

try:

734

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

735

except OSError as error:

736

if error.errno == errno.ECHILD:

737

# This should never happen

738

logger.error("Child process vanished",

739

exc_info=error)

740

return True

741

raise

742

if pid:

743

gobject.source_remove(self.checker_callback_tag)

744

self.checker_callback(pid, status, command)

745

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

1066

746

return True

1067

747

1068

748

def stop_checker(self):

1069

749

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

1070

750

if self.checker_callback_tag:

1071

GLib.source_remove(self.checker_callback_tag)

751

gobject.source_remove(self.checker_callback_tag)

1072

752

self.checker_callback_tag = None

1073

753

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

1074

754

return

1075

755

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

1076

self.checker.terminate()

756

try:

757

self.checker.terminate()

758

#time.sleep(0.5)

759

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

760

# self.checker.kill()

761

except OSError as error:

762

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

763

raise

1077

764

self.checker = None

1078

765

1079

766

1143

830

access="r")

1144

831

def Property_dbus_property(self):

1145

832

return dbus.Boolean(False)

1146

1147

See also the DBusObjectWithAnnotations class.

1148

833

"""

1149

834

1150

835

def decorator(func):

1172

857

pass

1173

858

1174

859

1175

class DBusObjectWithAnnotations(dbus.service.Object):

1176

"""A D-Bus object with annotations.

860

class DBusObjectWithProperties(dbus.service.Object):

861

"""A D-Bus object with properties.

1177

862

1178

Classes inheriting from this can use the dbus_annotations

1179

decorator to add annotations to methods or signals.

863

Classes inheriting from this can use the dbus_service_property

864

decorator to expose methods as D-Bus properties. It exposes the

865

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

1180

866

"""

1181

867

1182

868

@staticmethod

1198

884

for name, athing in

1199

885

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

1200

886

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):

1265

"""A D-Bus object with properties.

1266

1267

Classes inheriting from this can use the dbus_service_property

1268

decorator to expose methods as D-Bus properties. It exposes the

1269

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

1270

"""

1271

1272

887

def _get_dbus_property(self, interface_name, property_name):

1273

888

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

1274

889

property with the specified name and interface.

1284

899

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

1285

900

self.dbus_object_path, interface_name, property_name))

1286

901

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

902

@dbus.service.method(dbus.PROPERTIES_IFACE,

1297

903

in_signature="ss",

1298

904

out_signature="v")

1368

974

1369

975

Inserts property tags and interface annotation tags.

1370

976

"""

1371

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1372

object_path,

1373

connection)

977

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

978

connection)

1374

979

try:

1375

980

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

1376

981

1389

994

if prop._dbus_interface

1390

995

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

1391

996

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)

997

# Add annotation tags

998

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

999

for tag in if_tag.getElementsByTagName(typ):

1000

annots = dict()

1001

for name, prop in (self.

1002

_get_all_dbus_things(typ)):

1003

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

1004

and prop._dbus_interface

1005

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

1006

annots.update(getattr(

1007

prop, "_dbus_annotations", {}))

1008

for name, value in annots.items():

1009

ann_tag = document.createElement(

1010

"annotation")

1011

ann_tag.setAttribute("name", name)

1012

ann_tag.setAttribute("value", value)

1013

tag.appendChild(ann_tag)

1014

# Add interface annotation tags

1015

for annotation, value in dict(

1016

itertools.chain.from_iterable(

1017

annotations().items()

1018

for name, annotations

1019

in self._get_all_dbus_things("interface")

1020

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

1021

)).items():

1022

ann_tag = document.createElement("annotation")

1023

ann_tag.setAttribute("name", annotation)

1024

ann_tag.setAttribute("value", value)

1025

if_tag.appendChild(ann_tag)

1408

1026

# Add the names to the return values for the

1409

1027

# "org.freedesktop.DBus.Properties" methods

1410

1028

if (if_tag.getAttribute("name")

1428

1046

exc_info=error)

1429

1047

return xmlstring

1430

1048

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

1049

1500

1050

def datetime_to_dbus(dt, variant_level=0):

1501

1051

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

1550

1100

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

1551

1101

# Extract the original non-method undecorated

1552

1102

# function by black magic

1553

if sys.version_info.major == 2:

1554

nonmethod_func = (dict(

1555

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)

1103

nonmethod_func = (dict(

1104

zip(attribute.func_code.co_freevars,

1105

attribute.__closure__))

1106

["func"].cell_contents)

1563

1107

# Create a new, but exactly alike, function

1564

1108

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

1565

1109

# with the alternate D-Bus interface name

1566

new_function = copy_function(nonmethod_func)

1567

1110

new_function = (dbus.service.signal(

1568

alt_interface,

1569

attribute._dbus_signature)(new_function))

1111

alt_interface, attribute._dbus_signature)

1112

(types.FunctionType(

1113

nonmethod_func.func_code,

1114

nonmethod_func.func_globals,

1115

nonmethod_func.func_name,

1116

nonmethod_func.func_defaults,

1117

nonmethod_func.func_closure)))

1570

1118

# Copy annotations, if any

1571

1119

try:

1572

1120

new_function._dbus_annotations = dict(

1582

1130

func1 and func2 to the "call_both" function

1583

1131

outside of its arguments"""

1584

1132

1585

@functools.wraps(func2)

1586

1133

def call_both(*args, **kwargs):

1587

1134

"""This function will emit two D-Bus

1588

1135

signals by calling func1 and func2"""

1589

1136

func1(*args, **kwargs)

1590

1137

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

1138

1596

1139

return call_both

1597

1140

# Create the "call_both" function and add it to

1608

1151

alt_interface,

1609

1152

attribute._dbus_in_signature,

1610

1153

attribute._dbus_out_signature)

1611

(copy_function(attribute)))

1154

(types.FunctionType(attribute.func_code,

1155

attribute.func_globals,

1156

attribute.func_name,

1157

attribute.func_defaults,

1158

attribute.func_closure)))

1612

1159

# Copy annotations, if any

1613

1160

try:

1614

1161

attr[attrname]._dbus_annotations = dict(

1626

1173

attribute._dbus_access,

1627

1174

attribute._dbus_get_args_options

1628

1175

["byte_arrays"])

1629

(copy_function(attribute)))

1176

(types.FunctionType(

1177

attribute.func_code,

1178

attribute.func_globals,

1179

attribute.func_name,

1180

attribute.func_defaults,

1181

attribute.func_closure)))

1630

1182

# Copy annotations, if any

1631

1183

try:

1632

1184

attr[attrname]._dbus_annotations = dict(

1641

1193

# to the class.

1642

1194

attr[attrname] = (

1643

1195

dbus_interface_annotations(alt_interface)

1644

(copy_function(attribute)))

1196

(types.FunctionType(attribute.func_code,

1197

attribute.func_globals,

1198

attribute.func_name,

1199

attribute.func_defaults,

1200

attribute.func_closure)))

1645

1201

if deprecate:

1646

1202

# Deprecate all alternate interfaces

1647

1203

iname="_AlternateDBusNames_interface_annotation{}"

1660

1216

if interface_names:

1661

1217

# Replace the class with a new subclass of it with

1662

1218

# 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)

1219

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

1220

(cls, ), attr)

1669

1221

return cls

1670

1222

1671

1223

return wrapper

1791

1343

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

1792

1344

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

1793

1345

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:

1346

def checker_callback(self, pid, condition, command,

1347

*args, **kwargs):

1348

self.checker_callback_tag = None

1349

self.checker = None

1350

if os.WIFEXITED(condition):

1351

exitstatus = os.WEXITSTATUS(condition)

1801

1352

# Emit D-Bus signal

1802

1353

self.CheckerCompleted(dbus.Int16(exitstatus),

1803

# This is specific to GNU libC

1804

dbus.Int64(exitstatus << 8),

1354

dbus.Int64(condition),

1805

1355

dbus.String(command))

1806

1356

else:

1807

1357

# Emit D-Bus signal

1808

1358

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

1809

dbus.Int64(

1810

# This is specific to GNU libC

1811

(exitstatus << 8)

1812

| self.last_checker_signal),

1359

dbus.Int64(condition),

1813

1360

dbus.String(command))

1814

return ret

1361

1362

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

1363

*args, **kwargs)

1815

1364

1816

1365

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

1817

1366

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

1829

1378

1830

1379

def approve(self, value=True):

1831

1380

self.approved = value

1832

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

1833

* 1000), self._reset_approved)

1381

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

1382

* 1000), self._reset_approved)

1834

1383

self.send_changedstate()

1835

1384

1836

1385

## D-Bus methods, signals & properties

1892

1441

self.checked_ok()

1893

1442

1894

1443

# Enable - method

1895

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

1896

1444

@dbus.service.method(_interface)

1897

1445

def Enable(self):

1898

1446

"D-Bus method"

1899

1447

self.enable()

1900

1448

1901

1449

# StartChecker - method

1902

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

1903

1450

@dbus.service.method(_interface)

1904

1451

def StartChecker(self):

1905

1452

"D-Bus method"

1906

1453

self.start_checker()

1907

1454

1908

1455

# Disable - method

1909

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

1910

1456

@dbus.service.method(_interface)

1911

1457

def Disable(self):

1912

1458

"D-Bus method"

1913

1459

self.disable()

1914

1460

1915

1461

# StopChecker - method

1916

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

1917

1462

@dbus.service.method(_interface)

1918

1463

def StopChecker(self):

1919

1464

self.stop_checker()

1955

1500

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

1956

1501

1957

1502

# Name - property

1958

@dbus_annotations(

1959

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

1960

1503

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

1961

1504

def Name_dbus_property(self):

1962

1505

return dbus.String(self.name)

1963

1506

1964

1507

# Fingerprint - property

1965

@dbus_annotations(

1966

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

1967

1508

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

1968

1509

def Fingerprint_dbus_property(self):

1969

1510

return dbus.String(self.fingerprint)

1978

1519

self.host = str(value)

1979

1520

1980

1521

# Created - property

1981

@dbus_annotations(

1982

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

1983

1522

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

1984

1523

def Created_dbus_property(self):

1985

1524

return datetime_to_dbus(self.created)

2046

1585

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

2047

1586

is None):

2048

1587

return

2049

GLib.source_remove(self.disable_initiator_tag)

2050

self.disable_initiator_tag = GLib.timeout_add(

1588

gobject.source_remove(self.disable_initiator_tag)

1589

self.disable_initiator_tag = gobject.timeout_add(

2051

1590

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

2052

1591

self.disable)

2053

1592

2073

1612

return

2074

1613

if self.enabled:

2075

1614

# Reschedule checker run

2076

GLib.source_remove(self.checker_initiator_tag)

2077

self.checker_initiator_tag = GLib.timeout_add(

1615

gobject.source_remove(self.checker_initiator_tag)

1616

self.checker_initiator_tag = gobject.timeout_add(

2078

1617

value, self.start_checker)

2079

1618

self.start_checker() # Start one now, too

2080

1619

2100

1639

self.stop_checker()

2101

1640

2102

1641

# ObjectPath - property

2103

@dbus_annotations(

2104

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

2105

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

2106

1642

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

2107

1643

def ObjectPath_dbus_property(self):

2108

1644

return self.dbus_object_path # is already a dbus.ObjectPath

2109

1645

2110

1646

# Secret = property

2111

@dbus_annotations(

2112

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

2113

"invalidates"})

2114

1647

@dbus_service_property(_interface,

2115

1648

signature="ay",

2116

1649

access="write",

2126

1659

self._pipe = child_pipe

2127

1660

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

2128

1661

if not self._pipe.recv():

2129

raise KeyError(fpr)

1662

raise KeyError()

2130

1663

2131

1664

def __getattribute__(self, name):

2132

1665

if name == '_pipe':

2162

1695

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

2163

1696

self.server.child_pipe.fileno())

2164

1697

2165

session = gnutls.ClientSession(self.request)

1698

session = gnutls.connection.ClientSession(

1699

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

1700

1701

# Note: gnutls.connection.X509Credentials is really a

1702

# generic GnuTLS certificate credentials object so long as

1703

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

1704

# here despite using OpenPGP certificates.

2166

1705

2167

1706

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

2168

1707

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

2172

1711

priority = self.server.gnutls_priority

2173

1712

if priority is None:

2174

1713

priority = "NORMAL"

2175

gnutls.priority_set_direct(session._c_object, priority,

2176

None)

1714

gnutls.library.functions.gnutls_priority_set_direct(

1715

session._c_object, priority, None)

2177

1716

2178

1717

# Start communication using the Mandos protocol

2179

1718

# Get protocol number

2189

1728

# Start GnuTLS connection

2190

1729

try:

2191

1730

session.handshake()

2192

except gnutls.Error as error:

1731

except gnutls.errors.GNUTLSError as error:

2193

1732

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

2194

1733

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

2195

1734

# established. Just abandon the request.

2201

1740

try:

2202

1741

fpr = self.fingerprint(

2203

1742

self.peer_certificate(session))

2204

except (TypeError, gnutls.Error) as error:

1743

except (TypeError,

1744

gnutls.errors.GNUTLSError) as error:

2205

1745

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

2206

1746

return

2207

1747

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

2265

1805

else:

2266

1806

delay -= time2 - time

2267

1807

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

1808

sent_size = 0

1809

while sent_size < len(client.secret):

1810

try:

1811

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

1812

except gnutls.errors.GNUTLSError as error:

1813

logger.warning("gnutls send failed",

1814

exc_info=error)

1815

return

1816

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

1817

len(client.secret) - (sent_size

1818

+ sent))

1819

sent_size += sent

2274

1820

2275

1821

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

2276

1822

# bump the timeout using extended_timeout

2284

1830

client.approvals_pending -= 1

2285

1831

try:

2286

1832

session.bye()

2287

except gnutls.Error as error:

1833

except gnutls.errors.GNUTLSError as error:

2288

1834

logger.warning("GnuTLS bye failed",

2289

1835

exc_info=error)

2290

1836

2292

1838

def peer_certificate(session):

2293

1839

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

2294

1840

# 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""

1841

if (gnutls.library.functions.gnutls_certificate_type_get(

1842

session._c_object)

1843

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

1844

# ...do the normal thing

1845

return session.peer_certificate

2299

1846

list_size = ctypes.c_uint(1)

2300

cert_list = (gnutls.certificate_get_peers

1847

cert_list = (gnutls.library.functions

1848

.gnutls_certificate_get_peers

2301

1849

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

2302

1850

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

2303

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

1851

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

1852

" certificate")

2304

1853

if list_size.value == 0:

2305

1854

return None

2306

1855

cert = cert_list[0]

2310

1859

def fingerprint(openpgp):

2311

1860

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

2312

1861

# New GnuTLS "datum" with the OpenPGP public key

2313

datum = gnutls.datum_t(

1862

datum = gnutls.library.types.gnutls_datum_t(

2314

1863

ctypes.cast(ctypes.c_char_p(openpgp),

2315

1864

ctypes.POINTER(ctypes.c_ubyte)),

2316

1865

ctypes.c_uint(len(openpgp)))

2317

1866

# New empty GnuTLS certificate

2318

crt = gnutls.openpgp_crt_t()

2319

gnutls.openpgp_crt_init(ctypes.byref(crt))

1867

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1868

gnutls.library.functions.gnutls_openpgp_crt_init(

1869

ctypes.byref(crt))

2320

1870

# Import the OpenPGP public key into the certificate

2321

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

2322

gnutls.OPENPGP_FMT_RAW)

1871

gnutls.library.functions.gnutls_openpgp_crt_import(

1872

crt, ctypes.byref(datum),

1873

gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)

2323

1874

# Verify the self signature in the key

2324

1875

crtverify = ctypes.c_uint()

2325

gnutls.openpgp_crt_verify_self(crt, 0,

2326

ctypes.byref(crtverify))

1876

gnutls.library.functions.gnutls_openpgp_crt_verify_self(

1877

crt, 0, ctypes.byref(crtverify))

2327

1878

if crtverify.value != 0:

2328

gnutls.openpgp_crt_deinit(crt)

2329

raise gnutls.CertificateSecurityError("Verify failed")

1879

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1880

raise gnutls.errors.CertificateSecurityError(

1881

"Verify failed")

2330

1882

# New buffer for the fingerprint

2331

1883

buf = ctypes.create_string_buffer(20)

2332

1884

buf_len = ctypes.c_size_t()

2333

1885

# Get the fingerprint from the certificate into the buffer

2334

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

2335

ctypes.byref(buf_len))

1886

gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint(

1887

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

2336

1888

# Deinit the certificate

2337

gnutls.openpgp_crt_deinit(crt)

1889

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2338

1890

# Convert the buffer to a Python bytestring

2339

1891

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

2340

1892

# Convert the bytestring to hexadecimal notation

2484

2036

gnutls_priority GnuTLS priority string

2485

2037

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

2486

2038

2487

Assumes a GLib.MainLoop event loop.

2039

Assumes a gobject.MainLoop event loop.

2488

2040

"""

2489

2041

2490

2042

def __init__(self, server_address, RequestHandlerClass,

2515

2067

2516

2068

def add_pipe(self, parent_pipe, proc):

2517

2069

# Call "handle_ipc" for both data and EOF events

2518

GLib.io_add_watch(

2070

gobject.io_add_watch(

2519

2071

parent_pipe.fileno(),

2520

GLib.IO_IN | GLib.IO_HUP,

2072

gobject.IO_IN | gobject.IO_HUP,

2521

2073

functools.partial(self.handle_ipc,

2522

2074

parent_pipe = parent_pipe,

2523

2075

proc = proc))

2527

2079

proc = None,

2528

2080

client_object=None):

2529

2081

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

2530

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

2082

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

2531

2083

# Wait for other process to exit

2532

2084

proc.join()

2533

2085

return False

2540

2092

fpr = request[1]

2541

2093

address = request[2]

2542

2094

2543

for c in self.clients.values():

2095

for c in self.clients.itervalues():

2544

2096

if c.fingerprint == fpr:

2545

2097

client = c

2546

2098

break

2554

2106

parent_pipe.send(False)

2555

2107

return False

2556

2108

2557

GLib.io_add_watch(

2109

gobject.io_add_watch(

2558

2110

parent_pipe.fileno(),

2559

GLib.IO_IN | GLib.IO_HUP,

2111

gobject.IO_IN | gobject.IO_HUP,

2560

2112

functools.partial(self.handle_ipc,

2561

2113

parent_pipe = parent_pipe,

2562

2114

proc = proc,

2576

2128

2577

2129

if command == 'getattr':

2578

2130

attrname = request[1]

2579

if isinstance(client_object.__getattribute__(attrname),

2580

collections.Callable):

2131

if callable(client_object.__getattribute__(attrname)):

2581

2132

parent_pipe.send(('function', ))

2582

2133

else:

2583

2134

parent_pipe.send((

2618

2169

# avoid excessive use of external libraries.

2619

2170

2620

2171

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

2172

Token = collections.namedtuple("Token",

2173

("regexp", # To match token; if

2174

# "value" is not None,

2175

# must have a "group"

2176

# containing digits

2177

"value", # datetime.timedelta or

2178

# None

2179

"followers")) # Tokens valid after

2180

# this token

2621

2181

Token = collections.namedtuple("Token", (

2622

2182

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

2623

2183

# a "group" containing digits

2658

2218

# Define starting values

2659

2219

value = datetime.timedelta() # Value so far

2660

2220

found_token = None

2661

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

2221

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

2662

2222

s = duration # String left to parse

2663

2223

# Loop until end token is found

2664

2224

while found_token is not token_end:

2681

2241

break

2682

2242

else:

2683

2243

# No currently valid tokens were found

2684

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

2685

.format(duration))

2244

raise ValueError("Invalid RFC 3339 duration")

2686

2245

# End token found

2687

2246

return value

2688

2247

2821

2380

"debug": "False",

2822

2381

"priority":

2823

2382

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

2824

":+SIGN-DSA-SHA256",

2383

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

2825

2384

"servicename": "Mandos",

2826

2385

"use_dbus": "True",

2827

2386

"use_ipv6": "True",

2939

2498

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

2940

2499

pidfile = None

2941

2500

try:

2942

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

2501

pidfile = open(pidfilename, "w")

2943

2502

except IOError as e:

2944

2503

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

2945

2504

exc_info=e)

2946

2505

2947

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

2948

("mandos", "mandos"),

2949

("nobody", "nogroup")):

2506

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

2950

2507

try:

2951

2508

uid = pwd.getpwnam(name).pw_uid

2952

gid = pwd.getpwnam(group).pw_gid

2509

gid = pwd.getpwnam(name).pw_gid

2953

2510

break

2954

2511

except KeyError:

2955

2512

continue

2959

2516

try:

2960

2517

os.setgid(gid)

2961

2518

os.setuid(uid)

2962

if debug:

2963

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

2964

gid))

2965

2519

except OSError as error:

2966

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

2967

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

2968

2520

if error.errno != errno.EPERM:

2969

2521

raise

2970

2522

2973

2525

2974

2526

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

2975

2527

# - GnuTLS manual

2976

gnutls.global_set_log_level(11)

2528

gnutls.library.functions.gnutls_global_set_log_level(11)

2977

2529

2978

@gnutls.log_func

2530

@gnutls.library.types.gnutls_log_func

2979

2531

def debug_gnutls(level, string):

2980

2532

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

2981

2533

2982

gnutls.global_set_log_function(debug_gnutls)

2534

gnutls.library.functions.gnutls_global_set_log_function(

2535

debug_gnutls)

2983

2536

2984

2537

# Redirect stdin so all checkers get /dev/null

2985

2538

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

2992

2545

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

2993

2546

daemon()

2994

2547

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()

2548

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

2549

# need to inform gobject that threads will be used.

2550

gobject.threads_init()

2998

2551

2999

2552

global main_loop

3000

2553

# From the Avahi example code

3001

2554

DBusGMainLoop(set_as_default=True)

3002

main_loop = GLib.MainLoop()

2555

main_loop = gobject.MainLoop()

3003

2556

bus = dbus.SystemBus()

3004

2557

# End of Avahi example code

3005

2558

if use_dbus:

3010

2563

old_bus_name = dbus.service.BusName(

3011

2564

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

3012

2565

do_not_queue=True)

3013

except dbus.exceptions.DBusException as e:

2566

except dbus.exceptions.NameExistsException as e:

3014

2567

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

3015

2568

use_dbus = False

3016

2569

server_settings["use_dbus"] = False

3049

2602

if server_settings["restore"]:

3050

2603

try:

3051

2604

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"))

2605

clients_data, old_client_settings = pickle.load(

2606

stored_state)

3097

2607

os.remove(stored_state_path)

3098

2608

except IOError as e:

3099

2609

if e.errno == errno.ENOENT:

3132

2642

pass

3133

2643

3134

2644

# Clients who has passed its expire date can still be

3135

# enabled if its last checker was successful. A Client

2645

# enabled if its last checker was successful. Clients

3136

2646

# whose checker succeeded before we stored its state is

3137

2647

# assumed to have successfully run all checkers during

3138

2648

# downtime.

3190

2700

3191

2701

if not foreground:

3192

2702

if pidfile is not None:

3193

pid = os.getpid()

3194

2703

try:

3195

2704

with pidfile:

3196

print(pid, file=pidfile)

2705

pid = os.getpid()

2706

pidfile.write("{}\n".format(pid).encode("utf-8"))

3197

2707

except IOError:

3198

2708

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

3199

2709

pidfilename, pid)

3207

2717

3208

2718

@alternate_dbus_interfaces(

3209

2719

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

3210

class MandosDBusService(DBusObjectWithObjectManager):

2720

class MandosDBusService(DBusObjectWithProperties):

3211

2721

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

3212

2722

3213

2723

def __init__(self):

3215

2725

3216

2726

_interface = "se.recompile.Mandos"

3217

2727

2728

@dbus_interface_annotations(_interface)

2729

def _foo(self):

2730

return {

2731

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

2732

"false" }

2733

3218

2734

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

3219

2735

def ClientAdded(self, objpath):

3220

2736

"D-Bus signal"

3225

2741

"D-Bus signal"

3226

2742

pass

3227

2743

3228

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

3229

"true"})

3230

2744

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

3231

2745

def ClientRemoved(self, objpath, name):

3232

2746

"D-Bus signal"

3233

2747

pass

3234

2748

3235

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

3236

"true"})

3237

2749

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

3238

2750

def GetAllClients(self):

3239

2751

"D-Bus method"

3240

2752

return dbus.Array(c.dbus_object_path for c in

3241

tcp_server.clients.values())

2753

tcp_server.clients.itervalues())

3242

2754

3243

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

3244

"true"})

3245

2755

@dbus.service.method(_interface,

3246

2756

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

3247

2757

def GetAllClientsWithProperties(self):

3248

2758

"D-Bus method"

3249

2759

return dbus.Dictionary(

3250

{ c.dbus_object_path: c.GetAll(

3251

"se.recompile.Mandos.Client")

3252

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

2760

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

2761

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

3253

2762

signature="oa{sv}")

3254

2763

3255

2764

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

3256

2765

def RemoveClient(self, object_path):

3257

2766

"D-Bus method"

3258

for c in tcp_server.clients.values():

2767

for c in tcp_server.clients.itervalues():

3259

2768

if c.dbus_object_path == object_path:

3260

2769

del tcp_server.clients[c.name]

3261

2770

c.remove_from_connection()

3262

# Don't signal the disabling

2771

# Don't signal anything except ClientRemoved

3263

2772

c.disable(quiet=True)

3264

# Emit D-Bus signal for removal

3265

self.client_removed_signal(c)

2773

# Emit D-Bus signal

2774

self.ClientRemoved(object_path, c.name)

3266

2775

return

3267

2776

raise KeyError(object_path)

3268

2777

3269

2778

del _interface

3270

3271

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

3272

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

3273

def GetManagedObjects(self):

3274

"""D-Bus method"""

3275

return dbus.Dictionary(

3276

{ client.dbus_object_path:

3277

dbus.Dictionary(

3278

{ interface: client.GetAll(interface)

3279

for interface in

3280

client._get_all_interface_names()})

3281

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

3282

3283

def client_added_signal(self, client):

3284

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

3285

if use_dbus:

3286

# New standard signal

3287

self.InterfacesAdded(

3288

client.dbus_object_path,

3289

dbus.Dictionary(

3290

{ interface: client.GetAll(interface)

3291

for interface in

3292

client._get_all_interface_names()}))

3293

# Old signal

3294

self.ClientAdded(client.dbus_object_path)

3295

3296

def client_removed_signal(self, client):

3297

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

3298

if use_dbus:

3299

# New standard signal

3300

self.InterfacesRemoved(

3301

client.dbus_object_path,

3302

client._get_all_interface_names())

3303

# Old signal

3304

self.ClientRemoved(client.dbus_object_path,

3305

client.name)

3306

2779

3307

2780

mandos_dbus_service = MandosDBusService()

3308

2781

3321

2794

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

3322

2795

clients = {}

3323

2796

with PGPEngine() as pgp:

3324

for client in tcp_server.clients.values():

2797

for client in tcp_server.clients.itervalues():

3325

2798

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

3326

2799

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

3327

2800

key)

3351

2824

prefix='clients-',

3352

2825

dir=os.path.dirname(stored_state_path),

3353

2826

delete=False) as stored_state:

3354

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

3355

protocol = 2)

2827

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

3356

2828

tempname = stored_state.name

3357

2829

os.rename(tempname, stored_state_path)

3358

2830

except (IOError, OSError) as e:

3374

2846

name, client = tcp_server.clients.popitem()

3375

2847

if use_dbus:

3376

2848

client.remove_from_connection()

3377

# Don't signal the disabling

2849

# Don't signal anything except ClientRemoved

3378

2850

client.disable(quiet=True)

3379

# Emit D-Bus signal for removal

3380

2851

if use_dbus:

3381

mandos_dbus_service.client_removed_signal(client)

2852

# Emit D-Bus signal

2853

mandos_dbus_service.ClientRemoved(

2854

client.dbus_object_path, client.name)

3382

2855

client_settings.clear()

3383

2856

3384

2857

atexit.register(cleanup)

3385

2858

3386

for client in tcp_server.clients.values():

2859

for client in tcp_server.clients.itervalues():

3387

2860

if use_dbus:

3388

# Emit D-Bus signal for adding

3389

mandos_dbus_service.client_added_signal(client)

2861

# Emit D-Bus signal

2862

mandos_dbus_service.ClientAdded(client.dbus_object_path)

3390

2863

# Need to initiate checking of clients

3391

2864

if client.enabled:

3392

2865

client.init_checker()

3418

2891

sys.exit(1)

3419

2892

# End of Avahi example code

3420

2893

3421

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

3422

lambda *args, **kwargs:

3423

(tcp_server.handle_request

3424

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

2894

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

2895

lambda *args, **kwargs:

2896

(tcp_server.handle_request

2897

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

3425

2898

3426

2899

logger.debug("Starting main loop")

3427

2900

main_loop.run()