/mandos/trunk : revision 830

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#!/usr/bin/python2.7

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#!/usr/bin/python

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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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from future_builtins import *

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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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import SocketServer as socketserver

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try:

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import SocketServer as socketserver

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except ImportError:

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import socketserver

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import socket

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import argparse

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import datetime

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import errno

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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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try:

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import ConfigParser as configparser

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except ImportError:

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import configparser

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import sys

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import re

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import os

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import struct

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import fcntl

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import functools

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import cPickle as pickle

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try:

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import cPickle as pickle

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except ImportError:

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import pickle

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import multiprocessing

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import types

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import binascii

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import tempfile

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import itertools

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import collections

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import codecs

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import dbus

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import dbus.service

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import gobject

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import avahi

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from gi.repository import GLib

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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 = "1.6.9"

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version = "1.7.5"

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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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'--home', self.tempdir,

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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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dir=self.tempdir) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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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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dir = self.tempdir) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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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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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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self.add()

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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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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):

550

pass

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# Classes

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class Credentials(object):

554

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):

580

gnutls.deinit(self._c_object)

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582

def handshake(self):

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return gnutls.handshake(self._c_object)

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585

def send(self, data):

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data = bytes(data)

587

data_len = len(data)

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while data_len > 0:

589

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):

598

"""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

602

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):

607

"""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

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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

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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()

414

746

415

747

class Client(object):

416

748

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

422

754

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

423

755

to see if the client lives.

424

756

'None' if no process is running.

425

checker_callback_tag: a gobject event source tag, or None

757

checker_callback_tag: a GLib event source tag, or None

426

758

checker_command: string; External command which is run to check

427

759

if client lives. %() expansions are done at

428

760

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

429

761

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

430

checker_initiator_tag: a gobject event source tag, or None

762

checker_initiator_tag: a GLib event source tag, or None

431

763

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

432

764

client_structure: Object describing what attributes a client has

433

765

and is used for storing the client at exit

434

766

current_checker_command: string; current running checker_command

435

disable_initiator_tag: a gobject event source tag, or None

767

disable_initiator_tag: a GLib event source tag, or None

436

768

enabled: bool()

437

769

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

438

770

uniquely identify the client

443

775

last_checker_status: integer between 0 and 255 reflecting exit

444

776

status of last checker. -1 reflects crashed

445

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

446

780

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

447

781

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

448

782

D-Bus identifiers

499

833

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

500

834

.replace(" ", ""))

501

835

if "secret" in section:

502

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

836

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

837

.encode("utf-8"),

838

"base64")

503

839

elif "secfile" in section:

504

840

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

505

841

(section["secfile"])),

558

894

self.changedstate = multiprocessing_manager.Condition(

559

895

multiprocessing_manager.Lock())

560

896

self.client_structure = [attr

561

for attr in self.__dict__.iterkeys()

897

for attr in self.__dict__.keys()

562

898

if not attr.startswith("_")]

563

899

self.client_structure.append("client_structure")

564

900

590

926

if not quiet:

591

927

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

592

928

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

593

gobject.source_remove(self.disable_initiator_tag)

929

GLib.source_remove(self.disable_initiator_tag)

594

930

self.disable_initiator_tag = None

595

931

self.expires = None

596

932

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

597

gobject.source_remove(self.checker_initiator_tag)

933

GLib.source_remove(self.checker_initiator_tag)

598

934

self.checker_initiator_tag = None

599

935

self.stop_checker()

600

936

self.enabled = False

601

937

if not quiet:

602

938

self.send_changedstate()

603

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

939

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

604

940

return False

605

941

606

942

def __del__(self):

610

946

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

611

947

# and every interval from then on.

612

948

if self.checker_initiator_tag is not None:

613

gobject.source_remove(self.checker_initiator_tag)

614

self.checker_initiator_tag = gobject.timeout_add(

949

GLib.source_remove(self.checker_initiator_tag)

950

self.checker_initiator_tag = GLib.timeout_add(

615

951

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

616

952

self.start_checker)

617

953

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

618

954

if self.disable_initiator_tag is not None:

619

gobject.source_remove(self.disable_initiator_tag)

620

self.disable_initiator_tag = gobject.timeout_add(

955

GLib.source_remove(self.disable_initiator_tag)

956

self.disable_initiator_tag = GLib.timeout_add(

621

957

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

622

958

# Also start a new checker *right now*.

623

959

self.start_checker()

624

960

625

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

961

def checker_callback(self, source, condition, connection,

962

command):

626

963

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

627

964

self.checker_callback_tag = None

628

965

self.checker = None

629

if os.WIFEXITED(condition):

630

self.last_checker_status = os.WEXITSTATUS(condition)

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

631

973

if self.last_checker_status == 0:

632

974

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

633

975

vars(self))

636

978

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

637

979

else:

638

980

self.last_checker_status = -1

981

self.last_checker_signal = -returncode

639

982

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

640

983

vars(self))

984

return False

641

985

642

986

def checked_ok(self):

643

987

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

644

988

self.last_checked_ok = datetime.datetime.utcnow()

645

989

self.last_checker_status = 0

990

self.last_checker_signal = None

646

991

self.bump_timeout()

647

992

648

993

def bump_timeout(self, timeout=None):

650

995

if timeout is None:

651

996

timeout = self.timeout

652

997

if self.disable_initiator_tag is not None:

653

gobject.source_remove(self.disable_initiator_tag)

998

GLib.source_remove(self.disable_initiator_tag)

654

999

self.disable_initiator_tag = None

655

1000

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

656

self.disable_initiator_tag = gobject.timeout_add(

1001

self.disable_initiator_tag = GLib.timeout_add(

657

1002

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

658

1003

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

659

1004

674

1019

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

675

1020

# should be.

676

1021

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)

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

691

1026

# Start a new checker if needed

692

1027

if self.checker is None:

693

1028

# Escape attributes for the shell

702

1037

exc_info=error)

703

1038

return True # Try again later

704

1039

self.current_checker_command = command

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

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

746

1066

return True

747

1067

748

1068

def stop_checker(self):

749

1069

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

750

1070

if self.checker_callback_tag:

751

gobject.source_remove(self.checker_callback_tag)

1071

GLib.source_remove(self.checker_callback_tag)

752

1072

self.checker_callback_tag = None

753

1073

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

754

1074

return

755

1075

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

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

1076

self.checker.terminate()

764

1077

self.checker = None

765

1078

766

1079

830

1143

access="r")

831

1144

def Property_dbus_property(self):

832

1145

return dbus.Boolean(False)

1146

1147

See also the DBusObjectWithAnnotations class.

833

1148

"""

834

1149

835

1150

def decorator(func):

857

1172

pass

858

1173

859

1174

860

class DBusObjectWithProperties(dbus.service.Object):

861

"""A D-Bus object with properties.

1175

class DBusObjectWithAnnotations(dbus.service.Object):

1176

"""A D-Bus object with annotations.

862

1177

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.

1178

Classes inheriting from this can use the dbus_annotations

1179

decorator to add annotations to methods or signals.

866

1180

"""

867

1181

868

1182

@staticmethod

884

1198

for name, athing in

885

1199

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

886

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):

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

887

1272

def _get_dbus_property(self, interface_name, property_name):

888

1273

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

889

1274

property with the specified name and interface.

899

1284

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

900

1285

self.dbus_object_path, interface_name, property_name))

901

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

902

1296

@dbus.service.method(dbus.PROPERTIES_IFACE,

903

1297

in_signature="ss",

904

1298

out_signature="v")

974

1368

975

1369

Inserts property tags and interface annotation tags.

976

1370

"""

977

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

978

connection)

1371

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1372

object_path,

1373

connection)

979

1374

try:

980

1375

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

981

1376

994

1389

if prop._dbus_interface

995

1390

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

996

1391

if_tag.appendChild(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)

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)

1026

1408

# Add the names to the return values for the

1027

1409

# "org.freedesktop.DBus.Properties" methods

1028

1410

if (if_tag.getAttribute("name")

1046

1428

exc_info=error)

1047

1429

return xmlstring

1048

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

1049

1499

1050

1500

def datetime_to_dbus(dt, variant_level=0):

1051

1501

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

1100

1550

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

1101

1551

# Extract the original non-method undecorated

1102

1552

# function by black magic

1103

nonmethod_func = (dict(

1104

zip(attribute.func_code.co_freevars,

1105

attribute.__closure__))

1106

["func"].cell_contents)

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)

1107

1563

# Create a new, but exactly alike, function

1108

1564

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

1109

1565

# with the alternate D-Bus interface name

1566

new_function = copy_function(nonmethod_func)

1110

1567

new_function = (dbus.service.signal(

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)))

1568

alt_interface,

1569

attribute._dbus_signature)(new_function))

1118

1570

# Copy annotations, if any

1119

1571

try:

1120

1572

new_function._dbus_annotations = dict(

1130

1582

func1 and func2 to the "call_both" function

1131

1583

outside of its arguments"""

1132

1584

1585

@functools.wraps(func2)

1133

1586

def call_both(*args, **kwargs):

1134

1587

"""This function will emit two D-Bus

1135

1588

signals by calling func1 and func2"""

1136

1589

func1(*args, **kwargs)

1137

1590

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)

1138

1595

1139

1596

return call_both

1140

1597

# Create the "call_both" function and add it to

1151

1608

alt_interface,

1152

1609

attribute._dbus_in_signature,

1153

1610

attribute._dbus_out_signature)

1154

(types.FunctionType(attribute.func_code,

1155

attribute.func_globals,

1156

attribute.func_name,

1157

attribute.func_defaults,

1158

attribute.func_closure)))

1611

(copy_function(attribute)))

1159

1612

# Copy annotations, if any

1160

1613

try:

1161

1614

attr[attrname]._dbus_annotations = dict(

1173

1626

attribute._dbus_access,

1174

1627

attribute._dbus_get_args_options

1175

1628

["byte_arrays"])

1176

(types.FunctionType(

1177

attribute.func_code,

1178

attribute.func_globals,

1179

attribute.func_name,

1180

attribute.func_defaults,

1181

attribute.func_closure)))

1629

(copy_function(attribute)))

1182

1630

# Copy annotations, if any

1183

1631

try:

1184

1632

attr[attrname]._dbus_annotations = dict(

1193

1641

# to the class.

1194

1642

attr[attrname] = (

1195

1643

dbus_interface_annotations(alt_interface)

1196

(types.FunctionType(attribute.func_code,

1197

attribute.func_globals,

1198

attribute.func_name,

1199

attribute.func_defaults,

1200

attribute.func_closure)))

1644

(copy_function(attribute)))

1201

1645

if deprecate:

1202

1646

# Deprecate all alternate interfaces

1203

1647

iname="_AlternateDBusNames_interface_annotation{}"

1216

1660

if interface_names:

1217

1661

# Replace the class with a new subclass of it with

1218

1662

# methods, signals, etc. as created above.

1219

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

1220

(cls, ), attr)

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)

1221

1669

return cls

1222

1670

1223

1671

return wrapper

1343

1791

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

1344

1792

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

1345

1793

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)

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:

1352

1801

# Emit D-Bus signal

1353

1802

self.CheckerCompleted(dbus.Int16(exitstatus),

1354

dbus.Int64(condition),

1803

# This is specific to GNU libC

1804

dbus.Int64(exitstatus << 8),

1355

1805

dbus.String(command))

1356

1806

else:

1357

1807

# Emit D-Bus signal

1358

1808

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

1359

dbus.Int64(condition),

1809

dbus.Int64(

1810

# This is specific to GNU libC

1811

(exitstatus << 8)

1812

| self.last_checker_signal),

1360

1813

dbus.String(command))

1361

1362

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

1363

*args, **kwargs)

1814

return ret

1364

1815

1365

1816

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

1366

1817

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

1378

1829

1379

1830

def approve(self, value=True):

1380

1831

self.approved = value

1381

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

1382

* 1000), self._reset_approved)

1832

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

1833

* 1000), self._reset_approved)

1383

1834

self.send_changedstate()

1384

1835

1385

1836

## D-Bus methods, signals & properties

1441

1892

self.checked_ok()

1442

1893

1443

1894

# Enable - method

1895

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

1444

1896

@dbus.service.method(_interface)

1445

1897

def Enable(self):

1446

1898

"D-Bus method"

1447

1899

self.enable()

1448

1900

1449

1901

# StartChecker - method

1902

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

1450

1903

@dbus.service.method(_interface)

1451

1904

def StartChecker(self):

1452

1905

"D-Bus method"

1453

1906

self.start_checker()

1454

1907

1455

1908

# Disable - method

1909

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

1456

1910

@dbus.service.method(_interface)

1457

1911

def Disable(self):

1458

1912

"D-Bus method"

1459

1913

self.disable()

1460

1914

1461

1915

# StopChecker - method

1916

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

1462

1917

@dbus.service.method(_interface)

1463

1918

def StopChecker(self):

1464

1919

self.stop_checker()

1500

1955

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

1501

1956

1502

1957

# Name - property

1958

@dbus_annotations(

1959

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

1503

1960

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

1504

1961

def Name_dbus_property(self):

1505

1962

return dbus.String(self.name)

1506

1963

1507

1964

# Fingerprint - property

1965

@dbus_annotations(

1966

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

1508

1967

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

1509

1968

def Fingerprint_dbus_property(self):

1510

1969

return dbus.String(self.fingerprint)

1519

1978

self.host = str(value)

1520

1979

1521

1980

# Created - property

1981

@dbus_annotations(

1982

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

1522

1983

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

1523

1984

def Created_dbus_property(self):

1524

1985

return datetime_to_dbus(self.created)

1585

2046

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

1586

2047

is None):

1587

2048

return

1588

gobject.source_remove(self.disable_initiator_tag)

1589

self.disable_initiator_tag = gobject.timeout_add(

2049

GLib.source_remove(self.disable_initiator_tag)

2050

self.disable_initiator_tag = GLib.timeout_add(

1590

2051

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

1591

2052

self.disable)

1592

2053

1612

2073

return

1613

2074

if self.enabled:

1614

2075

# Reschedule checker run

1615

gobject.source_remove(self.checker_initiator_tag)

1616

self.checker_initiator_tag = gobject.timeout_add(

2076

GLib.source_remove(self.checker_initiator_tag)

2077

self.checker_initiator_tag = GLib.timeout_add(

1617

2078

value, self.start_checker)

1618

2079

self.start_checker() # Start one now, too

1619

2080

1639

2100

self.stop_checker()

1640

2101

1641

2102

# ObjectPath - property

2103

@dbus_annotations(

2104

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

2105

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

1642

2106

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

1643

2107

def ObjectPath_dbus_property(self):

1644

2108

return self.dbus_object_path # is already a dbus.ObjectPath

1645

2109

1646

2110

# Secret = property

2111

@dbus_annotations(

2112

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

2113

"invalidates"})

1647

2114

@dbus_service_property(_interface,

1648

2115

signature="ay",

1649

2116

access="write",

1659

2126

self._pipe = child_pipe

1660

2127

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

1661

2128

if not self._pipe.recv():

1662

raise KeyError()

2129

raise KeyError(fpr)

1663

2130

1664

2131

def __getattribute__(self, name):

1665

2132

if name == '_pipe':

1695

2162

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

1696

2163

self.server.child_pipe.fileno())

1697

2164

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.

2165

session = gnutls.ClientSession(self.request)

1705

2166

1706

2167

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

1707

2168

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

1711

2172

priority = self.server.gnutls_priority

1712

2173

if priority is None:

1713

2174

priority = "NORMAL"

1714

gnutls.library.functions.gnutls_priority_set_direct(

1715

session._c_object, priority, None)

2175

gnutls.priority_set_direct(session._c_object, priority,

2176

None)

1716

2177

1717

2178

# Start communication using the Mandos protocol

1718

2179

# Get protocol number

1728

2189

# Start GnuTLS connection

1729

2190

try:

1730

2191

session.handshake()

1731

except gnutls.errors.GNUTLSError as error:

2192

except gnutls.Error as error:

1732

2193

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

1733

2194

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

1734

2195

# established. Just abandon the request.

1740

2201

try:

1741

2202

fpr = self.fingerprint(

1742

2203

self.peer_certificate(session))

1743

except (TypeError,

1744

gnutls.errors.GNUTLSError) as error:

2204

except (TypeError, gnutls.Error) as error:

1745

2205

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

1746

2206

return

1747

2207

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

1805

2265

else:

1806

2266

delay -= time2 - time

1807

2267

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

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

1820

2274

1821

2275

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

1822

2276

# bump the timeout using extended_timeout

1830

2284

client.approvals_pending -= 1

1831

2285

try:

1832

2286

session.bye()

1833

except gnutls.errors.GNUTLSError as error:

2287

except gnutls.Error as error:

1834

2288

logger.warning("GnuTLS bye failed",

1835

2289

exc_info=error)

1836

2290

1838

2292

def peer_certificate(session):

1839

2293

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

1840

2294

# If not an OpenPGP certificate...

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

2295

if (gnutls.certificate_type_get(session._c_object)

2296

!= gnutls.CRT_OPENPGP):

2297

# ...return invalid data

2298

return b""

1846

2299

list_size = ctypes.c_uint(1)

1847

cert_list = (gnutls.library.functions

1848

.gnutls_certificate_get_peers

2300

cert_list = (gnutls.certificate_get_peers

1849

2301

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

1850

2302

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

1851

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

1852

" certificate")

2303

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

1853

2304

if list_size.value == 0:

1854

2305

return None

1855

2306

cert = cert_list[0]

1859

2310

def fingerprint(openpgp):

1860

2311

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

1861

2312

# New GnuTLS "datum" with the OpenPGP public key

1862

datum = gnutls.library.types.gnutls_datum_t(

2313

datum = gnutls.datum_t(

1863

2314

ctypes.cast(ctypes.c_char_p(openpgp),

1864

2315

ctypes.POINTER(ctypes.c_ubyte)),

1865

2316

ctypes.c_uint(len(openpgp)))

1866

2317

# New empty GnuTLS certificate

1867

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1868

gnutls.library.functions.gnutls_openpgp_crt_init(

1869

ctypes.byref(crt))

2318

crt = gnutls.openpgp_crt_t()

2319

gnutls.openpgp_crt_init(ctypes.byref(crt))

1870

2320

# Import the OpenPGP public key into the certificate

1871

gnutls.library.functions.gnutls_openpgp_crt_import(

1872

crt, ctypes.byref(datum),

1873

gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)

2321

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

2322

gnutls.OPENPGP_FMT_RAW)

1874

2323

# Verify the self signature in the key

1875

2324

crtverify = ctypes.c_uint()

1876

gnutls.library.functions.gnutls_openpgp_crt_verify_self(

1877

crt, 0, ctypes.byref(crtverify))

2325

gnutls.openpgp_crt_verify_self(crt, 0,

2326

ctypes.byref(crtverify))

1878

2327

if crtverify.value != 0:

1879

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1880

raise gnutls.errors.CertificateSecurityError(

1881

"Verify failed")

2328

gnutls.openpgp_crt_deinit(crt)

2329

raise gnutls.CertificateSecurityError("Verify failed")

1882

2330

# New buffer for the fingerprint

1883

2331

buf = ctypes.create_string_buffer(20)

1884

2332

buf_len = ctypes.c_size_t()

1885

2333

# Get the fingerprint from the certificate into the buffer

1886

gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint(

1887

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

2334

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

2335

ctypes.byref(buf_len))

1888

2336

# Deinit the certificate

1889

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2337

gnutls.openpgp_crt_deinit(crt)

1890

2338

# Convert the buffer to a Python bytestring

1891

2339

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

1892

2340

# Convert the bytestring to hexadecimal notation

2036

2484

gnutls_priority GnuTLS priority string

2037

2485

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

2038

2486

2039

Assumes a gobject.MainLoop event loop.

2487

Assumes a GLib.MainLoop event loop.

2040

2488

"""

2041

2489

2042

2490

def __init__(self, server_address, RequestHandlerClass,

2067

2515

2068

2516

def add_pipe(self, parent_pipe, proc):

2069

2517

# Call "handle_ipc" for both data and EOF events

2070

gobject.io_add_watch(

2518

GLib.io_add_watch(

2071

2519

parent_pipe.fileno(),

2072

gobject.IO_IN | gobject.IO_HUP,

2520

GLib.IO_IN | GLib.IO_HUP,

2073

2521

functools.partial(self.handle_ipc,

2074

2522

parent_pipe = parent_pipe,

2075

2523

proc = proc))

2079

2527

proc = None,

2080

2528

client_object=None):

2081

2529

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

2082

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

2530

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

2083

2531

# Wait for other process to exit

2084

2532

proc.join()

2085

2533

return False

2092

2540

fpr = request[1]

2093

2541

address = request[2]

2094

2542

2095

for c in self.clients.itervalues():

2543

for c in self.clients.values():

2096

2544

if c.fingerprint == fpr:

2097

2545

client = c

2098

2546

break

2106

2554

parent_pipe.send(False)

2107

2555

return False

2108

2556

2109

gobject.io_add_watch(

2557

GLib.io_add_watch(

2110

2558

parent_pipe.fileno(),

2111

gobject.IO_IN | gobject.IO_HUP,

2559

GLib.IO_IN | GLib.IO_HUP,

2112

2560

functools.partial(self.handle_ipc,

2113

2561

parent_pipe = parent_pipe,

2114

2562

proc = proc,

2128

2576

2129

2577

if command == 'getattr':

2130

2578

attrname = request[1]

2131

if callable(client_object.__getattribute__(attrname)):

2579

if isinstance(client_object.__getattribute__(attrname),

2580

collections.Callable):

2132

2581

parent_pipe.send(('function', ))

2133

2582

else:

2134

2583

parent_pipe.send((

2169

2618

# avoid excessive use of external libraries.

2170

2619

2171

2620

# 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

2181

2621

Token = collections.namedtuple("Token", (

2182

2622

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

2183

2623

# a "group" containing digits

2218

2658

# Define starting values

2219

2659

value = datetime.timedelta() # Value so far

2220

2660

found_token = None

2221

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

2661

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

2222

2662

s = duration # String left to parse

2223

2663

# Loop until end token is found

2224

2664

while found_token is not token_end:

2241

2681

break

2242

2682

else:

2243

2683

# No currently valid tokens were found

2244

raise ValueError("Invalid RFC 3339 duration")

2684

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

2685

.format(duration))

2245

2686

# End token found

2246

2687

return value

2247

2688

2380

2821

"debug": "False",

2381

2822

"priority":

2382

2823

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

2383

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

2824

":+SIGN-DSA-SHA256",

2384

2825

"servicename": "Mandos",

2385

2826

"use_dbus": "True",

2386

2827

"use_ipv6": "True",

2498

2939

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

2499

2940

pidfile = None

2500

2941

try:

2501

pidfile = open(pidfilename, "w")

2942

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

2502

2943

except IOError as e:

2503

2944

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

2504

2945

exc_info=e)

2505

2946

2506

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

2947

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

2948

("mandos", "mandos"),

2949

("nobody", "nogroup")):

2507

2950

try:

2508

2951

uid = pwd.getpwnam(name).pw_uid

2509

gid = pwd.getpwnam(name).pw_gid

2952

gid = pwd.getpwnam(group).pw_gid

2510

2953

break

2511

2954

except KeyError:

2512

2955

continue

2516

2959

try:

2517

2960

os.setgid(gid)

2518

2961

os.setuid(uid)

2962

if debug:

2963

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

2964

gid))

2519

2965

except OSError as error:

2966

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

2967

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

2520

2968

if error.errno != errno.EPERM:

2521

2969

raise

2522

2970

2525

2973

2526

2974

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

2527

2975

# - GnuTLS manual

2528

gnutls.library.functions.gnutls_global_set_log_level(11)

2976

gnutls.global_set_log_level(11)

2529

2977

2530

@gnutls.library.types.gnutls_log_func

2978

@gnutls.log_func

2531

2979

def debug_gnutls(level, string):

2532

2980

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

2533

2981

2534

gnutls.library.functions.gnutls_global_set_log_function(

2535

debug_gnutls)

2982

gnutls.global_set_log_function(debug_gnutls)

2536

2983

2537

2984

# Redirect stdin so all checkers get /dev/null

2538

2985

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

2545

2992

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

2546

2993

daemon()

2547

2994

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()

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()

2551

2998

2552

2999

global main_loop

2553

3000

# From the Avahi example code

2554

3001

DBusGMainLoop(set_as_default=True)

2555

main_loop = gobject.MainLoop()

3002

main_loop = GLib.MainLoop()

2556

3003

bus = dbus.SystemBus()

2557

3004

# End of Avahi example code

2558

3005

if use_dbus:

2563

3010

old_bus_name = dbus.service.BusName(

2564

3011

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

2565

3012

do_not_queue=True)

2566

except dbus.exceptions.NameExistsException as e:

3013

except dbus.exceptions.DBusException as e:

2567

3014

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

2568

3015

use_dbus = False

2569

3016

server_settings["use_dbus"] = False

2602

3049

if server_settings["restore"]:

2603

3050

try:

2604

3051

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

2605

clients_data, old_client_settings = pickle.load(

2606

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"))

2607

3097

os.remove(stored_state_path)

2608

3098

except IOError as e:

2609

3099

if e.errno == errno.ENOENT:

2642

3132

pass

2643

3133

2644

3134

# Clients who has passed its expire date can still be

2645

# enabled if its last checker was successful. Clients

3135

# enabled if its last checker was successful. A Client

2646

3136

# whose checker succeeded before we stored its state is

2647

3137

# assumed to have successfully run all checkers during

2648

3138

# downtime.

2700

3190

2701

3191

if not foreground:

2702

3192

if pidfile is not None:

3193

pid = os.getpid()

2703

3194

try:

2704

3195

with pidfile:

2705

pid = os.getpid()

2706

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

3196

print(pid, file=pidfile)

2707

3197

except IOError:

2708

3198

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

2709

3199

pidfilename, pid)

2717

3207

2718

3208

@alternate_dbus_interfaces(

2719

3209

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

2720

class MandosDBusService(DBusObjectWithProperties):

3210

class MandosDBusService(DBusObjectWithObjectManager):

2721

3211

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

2722

3212

2723

3213

def __init__(self):

2725

3215

2726

3216

_interface = "se.recompile.Mandos"

2727

3217

2728

@dbus_interface_annotations(_interface)

2729

def _foo(self):

2730

return {

2731

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

2732

"false" }

2733

2734

3218

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

2735

3219

def ClientAdded(self, objpath):

2736

3220

"D-Bus signal"

2741

3225

"D-Bus signal"

2742

3226

pass

2743

3227

3228

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

3229

"true"})

2744

3230

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

2745

3231

def ClientRemoved(self, objpath, name):

2746

3232

"D-Bus signal"

2747

3233

pass

2748

3234

3235

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

3236

"true"})

2749

3237

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

2750

3238

def GetAllClients(self):

2751

3239

"D-Bus method"

2752

3240

return dbus.Array(c.dbus_object_path for c in

2753

tcp_server.clients.itervalues())

3241

tcp_server.clients.values())

2754

3242

3243

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

3244

"true"})

2755

3245

@dbus.service.method(_interface,

2756

3246

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

2757

3247

def GetAllClientsWithProperties(self):

2758

3248

"D-Bus method"

2759

3249

return dbus.Dictionary(

2760

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

2761

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

3250

{ c.dbus_object_path: c.GetAll(

3251

"se.recompile.Mandos.Client")

3252

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

2762

3253

signature="oa{sv}")

2763

3254

2764

3255

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

2765

3256

def RemoveClient(self, object_path):

2766

3257

"D-Bus method"

2767

for c in tcp_server.clients.itervalues():

3258

for c in tcp_server.clients.values():

2768

3259

if c.dbus_object_path == object_path:

2769

3260

del tcp_server.clients[c.name]

2770

3261

c.remove_from_connection()

2771

# Don't signal anything except ClientRemoved

3262

# Don't signal the disabling

2772

3263

c.disable(quiet=True)

2773

# Emit D-Bus signal

2774

self.ClientRemoved(object_path, c.name)

3264

# Emit D-Bus signal for removal

3265

self.client_removed_signal(c)

2775

3266

return

2776

3267

raise KeyError(object_path)

2777

3268

2778

3269

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)

2779

3306

2780

3307

mandos_dbus_service = MandosDBusService()

2781

3308

2794

3321

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

2795

3322

clients = {}

2796

3323

with PGPEngine() as pgp:

2797

for client in tcp_server.clients.itervalues():

3324

for client in tcp_server.clients.values():

2798

3325

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

2799

3326

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

2800

3327

key)

2824

3351

prefix='clients-',

2825

3352

dir=os.path.dirname(stored_state_path),

2826

3353

delete=False) as stored_state:

2827

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

3354

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

3355

protocol = 2)

2828

3356

tempname = stored_state.name

2829

3357

os.rename(tempname, stored_state_path)

2830

3358

except (IOError, OSError) as e:

2846

3374

name, client = tcp_server.clients.popitem()

2847

3375

if use_dbus:

2848

3376

client.remove_from_connection()

2849

# Don't signal anything except ClientRemoved

3377

# Don't signal the disabling

2850

3378

client.disable(quiet=True)

3379

# Emit D-Bus signal for removal

2851

3380

if use_dbus:

2852

# Emit D-Bus signal

2853

mandos_dbus_service.ClientRemoved(

2854

client.dbus_object_path, client.name)

3381

mandos_dbus_service.client_removed_signal(client)

2855

3382

client_settings.clear()

2856

3383

2857

3384

atexit.register(cleanup)

2858

3385

2859

for client in tcp_server.clients.itervalues():

3386

for client in tcp_server.clients.values():

2860

3387

if use_dbus:

2861

# Emit D-Bus signal

2862

mandos_dbus_service.ClientAdded(client.dbus_object_path)

3388

# Emit D-Bus signal for adding

3389

mandos_dbus_service.client_added_signal(client)

2863

3390

# Need to initiate checking of clients

2864

3391

if client.enabled:

2865

3392

client.init_checker()

2891

3418

sys.exit(1)

2892

3419

# End of Avahi example code

2893

3420

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))

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))

2898

3425

2899

3426

logger.debug("Starting main loop")

2900

3427

main_loop.run()