/mandos/trunk : revision 753

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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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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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try:

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import ConfigParser as configparser

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except ImportError:

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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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try:

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import gobject

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except ImportError:

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from gi.repository import GObject as gobject

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import avahi

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from dbus.mainloop.glib import DBusGMainLoop

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import ctypes

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import ctypes.util

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import xml.dom.minidom

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import inspect

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# Try to find the value of SO_BINDTODEVICE:

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try:

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# This is where SO_BINDTODEVICE is in Python 3.3 (or 3.4?) and

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# newer, and it is also the most natural place for it:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except AttributeError:

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try:

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# This is where SO_BINDTODEVICE was up to and including Python

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# 2.6, and also 3.2:

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from IN import SO_BINDTODEVICE

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except ImportError:

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# In Python 2.7 it seems to have been removed entirely.

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# Try running the C preprocessor:

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try:

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cc = subprocess.Popen(["cc", "--language=c", "-E",

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"/dev/stdin"],

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stdin=subprocess.PIPE,

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stdout=subprocess.PIPE)

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stdout = cc.communicate(

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"#include <sys/socket.h>\nSO_BINDTODEVICE\n")[0]

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SO_BINDTODEVICE = int(stdout.splitlines()[-1])

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except (OSError, ValueError, IndexError):

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# No value found

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SO_BINDTODEVICE = None

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SO_BINDTODEVICE = None

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if sys.version_info.major == 2:

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str = unicode

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version = "1.7.10"

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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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# Only GPG version 1 has the --no-use-agent option.

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if self.gpg == "gpg" or self.gpg.endswith("/gpg"):

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self.gnupgargs.append("--no-use-agent")

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'--quiet',

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'--no-use-agent']

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def __enter__(self):

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return self

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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):

573

def __init__(self):

574

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):

584

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:],

610

data_len)

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def bye(self):

613

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

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# Error handling functions

616

def _error_code(result):

617

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

618

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

619

if result >= 0:

620

return result

621

if result == gnutls.E_NO_CERTIFICATE_FOUND:

622

raise gnutls.CertificateSecurityError(code = result)

623

raise gnutls.Error(code = result)

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625

def _retry_on_error(result, func, arguments):

626

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

627

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

628

while result < 0:

629

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

630

return _error_code(result)

631

result = func(*arguments)

632

return result

633

634

# Unless otherwise indicated, the function declarations below are

635

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

636

637

# Functions

638

priority_set_direct = _library.gnutls_priority_set_direct

639

priority_set_direct.argtypes = [session_t, ctypes.c_char_p,

640

ctypes.POINTER(ctypes.c_char_p)]

641

priority_set_direct.restype = _error_code

642

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init = _library.gnutls_init

644

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

645

init.restype = _error_code

646

647

set_default_priority = _library.gnutls_set_default_priority

648

set_default_priority.argtypes = [session_t]

649

set_default_priority.restype = _error_code

650

651

record_send = _library.gnutls_record_send

652

record_send.argtypes = [session_t, ctypes.c_void_p,

653

ctypes.c_size_t]

654

record_send.restype = ctypes.c_ssize_t

655

record_send.errcheck = _retry_on_error

656

657

certificate_allocate_credentials = (

658

_library.gnutls_certificate_allocate_credentials)

659

certificate_allocate_credentials.argtypes = [

660

ctypes.POINTER(certificate_credentials_t)]

661

certificate_allocate_credentials.restype = _error_code

662

663

certificate_free_credentials = (

664

_library.gnutls_certificate_free_credentials)

665

certificate_free_credentials.argtypes = [certificate_credentials_t]

666

certificate_free_credentials.restype = None

667

668

handshake_set_private_extensions = (

669

_library.gnutls_handshake_set_private_extensions)

670

handshake_set_private_extensions.argtypes = [session_t,

671

ctypes.c_int]

672

handshake_set_private_extensions.restype = None

673

674

credentials_set = _library.gnutls_credentials_set

675

credentials_set.argtypes = [session_t, credentials_type_t,

676

ctypes.c_void_p]

677

credentials_set.restype = _error_code

678

679

strerror = _library.gnutls_strerror

680

strerror.argtypes = [ctypes.c_int]

681

strerror.restype = ctypes.c_char_p

682

683

certificate_type_get = _library.gnutls_certificate_type_get

684

certificate_type_get.argtypes = [session_t]

685

certificate_type_get.restype = _error_code

686

687

certificate_get_peers = _library.gnutls_certificate_get_peers

688

certificate_get_peers.argtypes = [session_t,

689

ctypes.POINTER(ctypes.c_uint)]

690

certificate_get_peers.restype = ctypes.POINTER(datum_t)

691

692

global_set_log_level = _library.gnutls_global_set_log_level

693

global_set_log_level.argtypes = [ctypes.c_int]

694

global_set_log_level.restype = None

695

696

global_set_log_function = _library.gnutls_global_set_log_function

697

global_set_log_function.argtypes = [log_func]

698

global_set_log_function.restype = None

699

700

deinit = _library.gnutls_deinit

701

deinit.argtypes = [session_t]

702

deinit.restype = None

703

704

handshake = _library.gnutls_handshake

705

handshake.argtypes = [session_t]

706

handshake.restype = _error_code

707

handshake.errcheck = _retry_on_error

708

709

transport_set_ptr = _library.gnutls_transport_set_ptr

710

transport_set_ptr.argtypes = [session_t, transport_ptr_t]

711

transport_set_ptr.restype = None

712

713

bye = _library.gnutls_bye

714

bye.argtypes = [session_t, close_request_t]

715

bye.restype = _error_code

716

bye.errcheck = _retry_on_error

717

718

check_version = _library.gnutls_check_version

719

check_version.argtypes = [ctypes.c_char_p]

720

check_version.restype = ctypes.c_char_p

721

722

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

723

724

openpgp_crt_init = _library.gnutls_openpgp_crt_init

725

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

726

openpgp_crt_init.restype = _error_code

727

728

openpgp_crt_import = _library.gnutls_openpgp_crt_import

729

openpgp_crt_import.argtypes = [openpgp_crt_t,

730

ctypes.POINTER(datum_t),

731

openpgp_crt_fmt_t]

732

openpgp_crt_import.restype = _error_code

733

734

openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self

735

openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,

736

ctypes.POINTER(ctypes.c_uint)]

737

openpgp_crt_verify_self.restype = _error_code

738

739

openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit

740

openpgp_crt_deinit.argtypes = [openpgp_crt_t]

741

openpgp_crt_deinit.restype = None

742

743

openpgp_crt_get_fingerprint = (

744

_library.gnutls_openpgp_crt_get_fingerprint)

745

openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,

746

ctypes.c_void_p,

747

ctypes.POINTER(

748

ctypes.c_size_t)]

749

openpgp_crt_get_fingerprint.restype = _error_code

750

751

# Remove non-public functions

752

del _error_code, _retry_on_error

753

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

754

gnutls = GnuTLS()

755

756

def call_pipe(connection, # : multiprocessing.Connection

757

func, *args, **kwargs):

758

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

759

760

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

761

return value on the provided multiprocessing.Connection.

762

"""

763

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

764

connection.close()

765

427

766

428

class Client(object):

767

429

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

773

435

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

774

436

to see if the client lives.

775

437

'None' if no process is running.

776

checker_callback_tag: a GLib event source tag, or None

438

checker_callback_tag: a gobject event source tag, or None

777

439

checker_command: string; External command which is run to check

778

440

if client lives. %() expansions are done at

779

441

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

780

442

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

781

checker_initiator_tag: a GLib event source tag, or None

443

checker_initiator_tag: a gobject event source tag, or None

782

444

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

783

445

client_structure: Object describing what attributes a client has

784

446

and is used for storing the client at exit

785

447

current_checker_command: string; current running checker_command

786

disable_initiator_tag: a GLib event source tag, or None

448

disable_initiator_tag: a gobject event source tag, or None

787

449

enabled: bool()

788

450

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

789

451

uniquely identify the client

794

456

last_checker_status: integer between 0 and 255 reflecting exit

795

457

status of last checker. -1 reflects crashed

796

458

checker, -2 means no checker completed yet.

797

last_checker_signal: The signal which killed the last checker, if

798

last_checker_status is -1

799

459

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

800

460

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

801

461

D-Bus identifiers

852

512

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

853

513

.replace(" ", ""))

854

514

if "secret" in section:

855

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

856

.encode("utf-8"),

857

"base64")

515

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

858

516

elif "secfile" in section:

859

517

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

860

518

(section["secfile"])),

913

571

self.changedstate = multiprocessing_manager.Condition(

914

572

multiprocessing_manager.Lock())

915

573

self.client_structure = [attr

916

for attr in self.__dict__.keys()

574

for attr in self.__dict__.iterkeys()

917

575

if not attr.startswith("_")]

918

576

self.client_structure.append("client_structure")

919

577

945

603

if not quiet:

946

604

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

947

605

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

948

GLib.source_remove(self.disable_initiator_tag)

606

gobject.source_remove(self.disable_initiator_tag)

949

607

self.disable_initiator_tag = None

950

608

self.expires = None

951

609

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

952

GLib.source_remove(self.checker_initiator_tag)

610

gobject.source_remove(self.checker_initiator_tag)

953

611

self.checker_initiator_tag = None

954

612

self.stop_checker()

955

613

self.enabled = False

956

614

if not quiet:

957

615

self.send_changedstate()

958

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

616

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

959

617

return False

960

618

961

619

def __del__(self):

965

623

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

966

624

# and every interval from then on.

967

625

if self.checker_initiator_tag is not None:

968

GLib.source_remove(self.checker_initiator_tag)

969

self.checker_initiator_tag = GLib.timeout_add(

626

gobject.source_remove(self.checker_initiator_tag)

627

self.checker_initiator_tag = gobject.timeout_add(

970

628

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

971

629

self.start_checker)

972

630

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

973

631

if self.disable_initiator_tag is not None:

974

GLib.source_remove(self.disable_initiator_tag)

975

self.disable_initiator_tag = GLib.timeout_add(

632

gobject.source_remove(self.disable_initiator_tag)

633

self.disable_initiator_tag = gobject.timeout_add(

976

634

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

977

635

# Also start a new checker *right now*.

978

636

self.start_checker()

979

637

980

def checker_callback(self, source, condition, connection,

981

command):

638

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

982

639

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

983

640

self.checker_callback_tag = None

984

641

self.checker = None

985

# Read return code from connection (see call_pipe)

986

returncode = connection.recv()

987

connection.close()

988

989

if returncode >= 0:

990

self.last_checker_status = returncode

991

self.last_checker_signal = None

642

if os.WIFEXITED(condition):

643

self.last_checker_status = os.WEXITSTATUS(condition)

992

644

if self.last_checker_status == 0:

993

645

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

994

646

vars(self))

997

649

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

998

650

else:

999

651

self.last_checker_status = -1

1000

self.last_checker_signal = -returncode

1001

652

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

1002

653

vars(self))

1003

return False

1004

654

1005

655

def checked_ok(self):

1006

656

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

1007

657

self.last_checked_ok = datetime.datetime.utcnow()

1008

658

self.last_checker_status = 0

1009

self.last_checker_signal = None

1010

659

self.bump_timeout()

1011

660

1012

661

def bump_timeout(self, timeout=None):

1014

663

if timeout is None:

1015

664

timeout = self.timeout

1016

665

if self.disable_initiator_tag is not None:

1017

GLib.source_remove(self.disable_initiator_tag)

666

gobject.source_remove(self.disable_initiator_tag)

1018

667

self.disable_initiator_tag = None

1019

668

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

1020

self.disable_initiator_tag = GLib.timeout_add(

669

self.disable_initiator_tag = gobject.timeout_add(

1021

670

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

1022

671

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

1023

672

1038

687

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

1039

688

# should be.

1040

689

1041

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

1042

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

1043

self.checker.join()

1044

self.checker = None

690

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

691

try:

692

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

693

except AttributeError:

694

pass

695

except OSError as error:

696

if error.errno != errno.ECHILD:

697

raise

698

else:

699

if pid:

700

logger.warning("Checker was a zombie")

701

gobject.source_remove(self.checker_callback_tag)

702

self.checker_callback(pid, status,

703

self.current_checker_command)

1045

704

# Start a new checker if needed

1046

705

if self.checker is None:

1047

706

# Escape attributes for the shell

1056

715

exc_info=error)

1057

716

return True # Try again later

1058

717

self.current_checker_command = command

1059

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

1060

self.name)

1061

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

1062

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

1063

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

1064

# always replaced by /dev/null.)

1065

# The exception is when not debugging but nevertheless

1066

# running in the foreground; use the previously

1067

# created wnull.

1068

popen_args = { "close_fds": True,

1069

"shell": True,

1070

"cwd": "/" }

1071

if (not self.server_settings["debug"]

1072

and self.server_settings["foreground"]):

1073

popen_args.update({"stdout": wnull,

1074

"stderr": wnull })

1075

pipe = multiprocessing.Pipe(duplex = False)

1076

self.checker = multiprocessing.Process(

1077

target = call_pipe,

1078

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

1079

kwargs = popen_args)

1080

self.checker.start()

1081

self.checker_callback_tag = GLib.io_add_watch(

1082

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

1083

self.checker_callback, pipe[0], command)

1084

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

718

try:

719

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

720

self.name)

721

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

722

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

723

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

724

# always replaced by /dev/null.)

725

# The exception is when not debugging but nevertheless

726

# running in the foreground; use the previously

727

# created wnull.

728

popen_args = {}

729

if (not self.server_settings["debug"]

730

and self.server_settings["foreground"]):

731

popen_args.update({"stdout": wnull,

732

"stderr": wnull })

733

self.checker = subprocess.Popen(command,

734

close_fds=True,

735

shell=True,

736

cwd="/",

737

**popen_args)

738

except OSError as error:

739

logger.error("Failed to start subprocess",

740

exc_info=error)

741

return True

742

self.checker_callback_tag = gobject.child_watch_add(

743

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

744

# The checker may have completed before the gobject

745

# watch was added. Check for this.

746

try:

747

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

748

except OSError as error:

749

if error.errno == errno.ECHILD:

750

# This should never happen

751

logger.error("Child process vanished",

752

exc_info=error)

753

return True

754

raise

755

if pid:

756

gobject.source_remove(self.checker_callback_tag)

757

self.checker_callback(pid, status, command)

758

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

1085

759

return True

1086

760

1087

761

def stop_checker(self):

1088

762

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

1089

763

if self.checker_callback_tag:

1090

GLib.source_remove(self.checker_callback_tag)

764

gobject.source_remove(self.checker_callback_tag)

1091

765

self.checker_callback_tag = None

1092

766

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

1093

767

return

1094

768

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

1095

self.checker.terminate()

769

try:

770

self.checker.terminate()

771

#time.sleep(0.5)

772

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

773

# self.checker.kill()

774

except OSError as error:

775

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

776

raise

1096

777

self.checker = None

1097

778

1098

779

1162

843

access="r")

1163

844

def Property_dbus_property(self):

1164

845

return dbus.Boolean(False)

1165

1166

See also the DBusObjectWithAnnotations class.

1167

846

"""

1168

847

1169

848

def decorator(func):

1191

870

pass

1192

871

1193

872

1194

class DBusObjectWithAnnotations(dbus.service.Object):

1195

"""A D-Bus object with annotations.

873

class DBusObjectWithProperties(dbus.service.Object):

874

"""A D-Bus object with properties.

1196

875

1197

Classes inheriting from this can use the dbus_annotations

1198

decorator to add annotations to methods or signals.

876

Classes inheriting from this can use the dbus_service_property

877

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

878

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

1199

879

"""

1200

880

1201

881

@staticmethod

1217

897

for name, athing in

1218

898

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

1219

899

1220

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1221

out_signature = "s",

1222

path_keyword = 'object_path',

1223

connection_keyword = 'connection')

1224

def Introspect(self, object_path, connection):

1225

"""Overloading of standard D-Bus method.

1226

1227

Inserts annotation tags on methods and signals.

1228

"""

1229

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

1230

connection)

1231

try:

1232

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

1233

1234

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

1235

# Add annotation tags

1236

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

1237

for tag in if_tag.getElementsByTagName(typ):

1238

annots = dict()

1239

for name, prop in (self.

1240

_get_all_dbus_things(typ)):

1241

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

1242

and prop._dbus_interface

1243

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

1244

annots.update(getattr(

1245

prop, "_dbus_annotations", {}))

1246

for name, value in annots.items():

1247

ann_tag = document.createElement(

1248

"annotation")

1249

ann_tag.setAttribute("name", name)

1250

ann_tag.setAttribute("value", value)

1251

tag.appendChild(ann_tag)

1252

# Add interface annotation tags

1253

for annotation, value in dict(

1254

itertools.chain.from_iterable(

1255

annotations().items()

1256

for name, annotations

1257

in self._get_all_dbus_things("interface")

1258

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

1259

)).items():

1260

ann_tag = document.createElement("annotation")

1261

ann_tag.setAttribute("name", annotation)

1262

ann_tag.setAttribute("value", value)

1263

if_tag.appendChild(ann_tag)

1264

# Fix argument name for the Introspect method itself

1265

if (if_tag.getAttribute("name")

1266

== dbus.INTROSPECTABLE_IFACE):

1267

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

1268

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

1269

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

1270

if (arg.getAttribute("direction")

1271

== "out"):

1272

arg.setAttribute("name",

1273

"xml_data")

1274

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

1275

document.unlink()

1276

except (AttributeError, xml.dom.DOMException,

1277

xml.parsers.expat.ExpatError) as error:

1278

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

1279

exc_info=error)

1280

return xmlstring

1281

1282

1283

class DBusObjectWithProperties(DBusObjectWithAnnotations):

1284

"""A D-Bus object with properties.

1285

1286

Classes inheriting from this can use the dbus_service_property

1287

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

1288

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

1289

"""

1290

1291

900

def _get_dbus_property(self, interface_name, property_name):

1292

901

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

1293

902

property with the specified name and interface.

1303

912

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

1304

913

self.dbus_object_path, interface_name, property_name))

1305

914

1306

@classmethod

1307

def _get_all_interface_names(cls):

1308

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

1309

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

1310

"_dbus_interface", None)

1311

for x in (inspect.getmro(cls))

1312

for attr in dir(x))

1313

if name is not None)

1314

1315

915

@dbus.service.method(dbus.PROPERTIES_IFACE,

1316

916

in_signature="ss",

1317

917

out_signature="v")

1387

987

1388

988

Inserts property tags and interface annotation tags.

1389

989

"""

1390

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1391

object_path,

1392

connection)

990

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

991

connection)

1393

992

try:

1394

993

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

1395

994

1408

1007

if prop._dbus_interface

1409

1008

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

1410

1009

if_tag.appendChild(tag)

1411

# Add annotation tags for properties

1412

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

1413

annots = dict()

1414

for name, prop in self._get_all_dbus_things(

1415

"property"):

1416

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

1417

and prop._dbus_interface

1418

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

1419

annots.update(getattr(

1420

prop, "_dbus_annotations", {}))

1421

for name, value in annots.items():

1422

ann_tag = document.createElement(

1423

"annotation")

1424

ann_tag.setAttribute("name", name)

1425

ann_tag.setAttribute("value", value)

1426

tag.appendChild(ann_tag)

1010

# Add annotation tags

1011

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

1012

for tag in if_tag.getElementsByTagName(typ):

1013

annots = dict()

1014

for name, prop in (self.

1015

_get_all_dbus_things(typ)):

1016

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

1017

and prop._dbus_interface

1018

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

1019

annots.update(getattr(

1020

prop, "_dbus_annotations", {}))

1021

for name, value in annots.items():

1022

ann_tag = document.createElement(

1023

"annotation")

1024

ann_tag.setAttribute("name", name)

1025

ann_tag.setAttribute("value", value)

1026

tag.appendChild(ann_tag)

1027

# Add interface annotation tags

1028

for annotation, value in dict(

1029

itertools.chain.from_iterable(

1030

annotations().items()

1031

for name, annotations

1032

in self._get_all_dbus_things("interface")

1033

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

1034

)).items():

1035

ann_tag = document.createElement("annotation")

1036

ann_tag.setAttribute("name", annotation)

1037

ann_tag.setAttribute("value", value)

1038

if_tag.appendChild(ann_tag)

1427

1039

# Add the names to the return values for the

1428

1040

# "org.freedesktop.DBus.Properties" methods

1429

1041

if (if_tag.getAttribute("name")

1447

1059

exc_info=error)

1448

1060

return xmlstring

1449

1061

1450

try:

1451

dbus.OBJECT_MANAGER_IFACE

1452

except AttributeError:

1453

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

1454

1455

class DBusObjectWithObjectManager(DBusObjectWithAnnotations):

1456

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

1457

1458

Classes inheriting from this exposes the standard

1459

GetManagedObjects call and the InterfacesAdded and

1460

InterfacesRemoved signals on the standard

1461

"org.freedesktop.DBus.ObjectManager" interface.

1462

1463

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

1464

manually.

1465

"""

1466

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

1467

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

1468

def GetManagedObjects(self):

1469

"""This function must be overridden"""

1470

raise NotImplementedError()

1471

1472

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,

1473

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

1474

def InterfacesAdded(self, object_path, interfaces_and_properties):

1475

pass

1476

1477

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

1478

def InterfacesRemoved(self, object_path, interfaces):

1479

pass

1480

1481

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1482

out_signature = "s",

1483

path_keyword = 'object_path',

1484

connection_keyword = 'connection')

1485

def Introspect(self, object_path, connection):

1486

"""Overloading of standard D-Bus method.

1487

1488

Override return argument name of GetManagedObjects to be

1489

"objpath_interfaces_and_properties"

1490

"""

1491

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1492

object_path,

1493

connection)

1494

try:

1495

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

1496

1497

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

1498

# Fix argument name for the GetManagedObjects method

1499

if (if_tag.getAttribute("name")

1500

== dbus.OBJECT_MANAGER_IFACE):

1501

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

1502

if (cn.getAttribute("name")

1503

== "GetManagedObjects"):

1504

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

1505

if (arg.getAttribute("direction")

1506

== "out"):

1507

arg.setAttribute(

1508

"name",

1509

"objpath_interfaces"

1510

"_and_properties")

1511

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

1512

document.unlink()

1513

except (AttributeError, xml.dom.DOMException,

1514

xml.parsers.expat.ExpatError) as error:

1515

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

1516

exc_info = error)

1517

return xmlstring

1518

1062

1519

1063

def datetime_to_dbus(dt, variant_level=0):

1520

1064

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

1569

1113

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

1570

1114

# Extract the original non-method undecorated

1571

1115

# function by black magic

1572

if sys.version_info.major == 2:

1573

nonmethod_func = (dict(

1574

zip(attribute.func_code.co_freevars,

1575

attribute.__closure__))

1576

["func"].cell_contents)

1577

else:

1578

nonmethod_func = (dict(

1579

zip(attribute.__code__.co_freevars,

1580

attribute.__closure__))

1581

["func"].cell_contents)

1116

nonmethod_func = (dict(

1117

zip(attribute.func_code.co_freevars,

1118

attribute.__closure__))

1119

["func"].cell_contents)

1582

1120

# Create a new, but exactly alike, function

1583

1121

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

1584

1122

# with the alternate D-Bus interface name

1585

new_function = copy_function(nonmethod_func)

1586

1123

new_function = (dbus.service.signal(

1587

alt_interface,

1588

attribute._dbus_signature)(new_function))

1124

alt_interface, attribute._dbus_signature)

1125

(types.FunctionType(

1126

nonmethod_func.func_code,

1127

nonmethod_func.func_globals,

1128

nonmethod_func.func_name,

1129

nonmethod_func.func_defaults,

1130

nonmethod_func.func_closure)))

1589

1131

# Copy annotations, if any

1590

1132

try:

1591

1133

new_function._dbus_annotations = dict(

1601

1143

func1 and func2 to the "call_both" function

1602

1144

outside of its arguments"""

1603

1145

1604

@functools.wraps(func2)

1605

1146

def call_both(*args, **kwargs):

1606

1147

"""This function will emit two D-Bus

1607

1148

signals by calling func1 and func2"""

1608

1149

func1(*args, **kwargs)

1609

1150

func2(*args, **kwargs)

1610

# Make wrapper function look like a D-Bus signal

1611

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

1612

if name.startswith("_dbus_"):

1613

setattr(call_both, name, attr)

1614

1151

1615

1152

return call_both

1616

1153

# Create the "call_both" function and add it to

1627

1164

alt_interface,

1628

1165

attribute._dbus_in_signature,

1629

1166

attribute._dbus_out_signature)

1630

(copy_function(attribute)))

1167

(types.FunctionType(attribute.func_code,

1168

attribute.func_globals,

1169

attribute.func_name,

1170

attribute.func_defaults,

1171

attribute.func_closure)))

1631

1172

# Copy annotations, if any

1632

1173

try:

1633

1174

attr[attrname]._dbus_annotations = dict(

1645

1186

attribute._dbus_access,

1646

1187

attribute._dbus_get_args_options

1647

1188

["byte_arrays"])

1648

(copy_function(attribute)))

1189

(types.FunctionType(

1190

attribute.func_code,

1191

attribute.func_globals,

1192

attribute.func_name,

1193

attribute.func_defaults,

1194

attribute.func_closure)))

1649

1195

# Copy annotations, if any

1650

1196

try:

1651

1197

attr[attrname]._dbus_annotations = dict(

1660

1206

# to the class.

1661

1207

attr[attrname] = (

1662

1208

dbus_interface_annotations(alt_interface)

1663

(copy_function(attribute)))

1209

(types.FunctionType(attribute.func_code,

1210

attribute.func_globals,

1211

attribute.func_name,

1212

attribute.func_defaults,

1213

attribute.func_closure)))

1664

1214

if deprecate:

1665

1215

# Deprecate all alternate interfaces

1666

1216

iname="_AlternateDBusNames_interface_annotation{}"

1679

1229

if interface_names:

1680

1230

# Replace the class with a new subclass of it with

1681

1231

# methods, signals, etc. as created above.

1682

if sys.version_info.major == 2:

1683

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

1684

(cls, ), attr)

1685

else:

1686

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

1687

(cls, ), attr)

1232

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

1233

(cls, ), attr)

1688

1234

return cls

1689

1235

1690

1236

return wrapper

1810

1356

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

1811

1357

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

1812

1358

1813

def checker_callback(self, source, condition,

1814

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

1815

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

1816

connection, command, *args,

1817

**kwargs)

1818

exitstatus = self.last_checker_status

1819

if exitstatus >= 0:

1359

def checker_callback(self, pid, condition, command,

1360

*args, **kwargs):

1361

self.checker_callback_tag = None

1362

self.checker = None

1363

if os.WIFEXITED(condition):

1364

exitstatus = os.WEXITSTATUS(condition)

1820

1365

# Emit D-Bus signal

1821

1366

self.CheckerCompleted(dbus.Int16(exitstatus),

1822

# This is specific to GNU libC

1823

dbus.Int64(exitstatus << 8),

1367

dbus.Int64(condition),

1824

1368

dbus.String(command))

1825

1369

else:

1826

1370

# Emit D-Bus signal

1827

1371

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

1828

dbus.Int64(

1829

# This is specific to GNU libC

1830

(exitstatus << 8)

1831

| self.last_checker_signal),

1372

dbus.Int64(condition),

1832

1373

dbus.String(command))

1833

return ret

1374

1375

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

1376

*args, **kwargs)

1834

1377

1835

1378

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

1836

1379

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

1848

1391

1849

1392

def approve(self, value=True):

1850

1393

self.approved = value

1851

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

1852

* 1000), self._reset_approved)

1394

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

1395

* 1000), self._reset_approved)

1853

1396

self.send_changedstate()

1854

1397

1855

1398

## D-Bus methods, signals & properties

1911

1454

self.checked_ok()

1912

1455

1913

1456

# Enable - method

1914

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

1915

1457

@dbus.service.method(_interface)

1916

1458

def Enable(self):

1917

1459

"D-Bus method"

1918

1460

self.enable()

1919

1461

1920

1462

# StartChecker - method

1921

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

1922

1463

@dbus.service.method(_interface)

1923

1464

def StartChecker(self):

1924

1465

"D-Bus method"

1925

1466

self.start_checker()

1926

1467

1927

1468

# Disable - method

1928

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

1929

1469

@dbus.service.method(_interface)

1930

1470

def Disable(self):

1931

1471

"D-Bus method"

1932

1472

self.disable()

1933

1473

1934

1474

# StopChecker - method

1935

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

1936

1475

@dbus.service.method(_interface)

1937

1476

def StopChecker(self):

1938

1477

self.stop_checker()

1974

1513

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

1975

1514

1976

1515

# Name - property

1977

@dbus_annotations(

1978

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

1979

1516

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

1980

1517

def Name_dbus_property(self):

1981

1518

return dbus.String(self.name)

1982

1519

1983

1520

# Fingerprint - property

1984

@dbus_annotations(

1985

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

1986

1521

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

1987

1522

def Fingerprint_dbus_property(self):

1988

1523

return dbus.String(self.fingerprint)

1997

1532

self.host = str(value)

1998

1533

1999

1534

# Created - property

2000

@dbus_annotations(

2001

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

2002

1535

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

2003

1536

def Created_dbus_property(self):

2004

1537

return datetime_to_dbus(self.created)

2065

1598

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

2066

1599

is None):

2067

1600

return

2068

GLib.source_remove(self.disable_initiator_tag)

2069

self.disable_initiator_tag = GLib.timeout_add(

1601

gobject.source_remove(self.disable_initiator_tag)

1602

self.disable_initiator_tag = gobject.timeout_add(

2070

1603

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

2071

1604

self.disable)

2072

1605

2092

1625

return

2093

1626

if self.enabled:

2094

1627

# Reschedule checker run

2095

GLib.source_remove(self.checker_initiator_tag)

2096

self.checker_initiator_tag = GLib.timeout_add(

1628

gobject.source_remove(self.checker_initiator_tag)

1629

self.checker_initiator_tag = gobject.timeout_add(

2097

1630

value, self.start_checker)

2098

1631

self.start_checker() # Start one now, too

2099

1632

2119

1652

self.stop_checker()

2120

1653

2121

1654

# ObjectPath - property

2122

@dbus_annotations(

2123

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

2124

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

2125

1655

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

2126

1656

def ObjectPath_dbus_property(self):

2127

1657

return self.dbus_object_path # is already a dbus.ObjectPath

2128

1658

2129

1659

# Secret = property

2130

@dbus_annotations(

2131

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

2132

"invalidates"})

2133

1660

@dbus_service_property(_interface,

2134

1661

signature="ay",

2135

1662

access="write",

2181

1708

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

2182

1709

self.server.child_pipe.fileno())

2183

1710

2184

session = gnutls.ClientSession(self.request)

1711

session = gnutls.connection.ClientSession(

1712

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

1713

1714

# Note: gnutls.connection.X509Credentials is really a

1715

# generic GnuTLS certificate credentials object so long as

1716

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

1717

# here despite using OpenPGP certificates.

2185

1718

2186

1719

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

2187

1720

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

2191

1724

priority = self.server.gnutls_priority

2192

1725

if priority is None:

2193

1726

priority = "NORMAL"

2194

gnutls.priority_set_direct(session._c_object,

2195

priority.encode("utf-8"),

2196

None)

1727

gnutls.library.functions.gnutls_priority_set_direct(

1728

session._c_object, priority, None)

2197

1729

2198

1730

# Start communication using the Mandos protocol

2199

1731

# Get protocol number

2209

1741

# Start GnuTLS connection

2210

1742

try:

2211

1743

session.handshake()

2212

except gnutls.Error as error:

1744

except gnutls.errors.GNUTLSError as error:

2213

1745

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

2214

1746

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

2215

1747

# established. Just abandon the request.

2221

1753

try:

2222

1754

fpr = self.fingerprint(

2223

1755

self.peer_certificate(session))

2224

except (TypeError, gnutls.Error) as error:

1756

except (TypeError,

1757

gnutls.errors.GNUTLSError) as error:

2225

1758

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

2226

1759

return

2227

1760

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

2285

1818

else:

2286

1819

delay -= time2 - time

2287

1820

2288

try:

2289

session.send(client.secret)

2290

except gnutls.Error as error:

2291

logger.warning("gnutls send failed",

2292

exc_info = error)

2293

return

1821

sent_size = 0

1822

while sent_size < len(client.secret):

1823

try:

1824

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

1825

except gnutls.errors.GNUTLSError as error:

1826

logger.warning("gnutls send failed",

1827

exc_info=error)

1828

return

1829

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

1830

len(client.secret) - (sent_size

1831

+ sent))

1832

sent_size += sent

2294

1833

2295

1834

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

2296

1835

# bump the timeout using extended_timeout

2304

1843

client.approvals_pending -= 1

2305

1844

try:

2306

1845

session.bye()

2307

except gnutls.Error as error:

1846

except gnutls.errors.GNUTLSError as error:

2308

1847

logger.warning("GnuTLS bye failed",

2309

1848

exc_info=error)

2310

1849

2312

1851

def peer_certificate(session):

2313

1852

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

2314

1853

# If not an OpenPGP certificate...

2315

if (gnutls.certificate_type_get(session._c_object)

2316

!= gnutls.CRT_OPENPGP):

2317

# ...return invalid data

2318

return b""

1854

if (gnutls.library.functions.gnutls_certificate_type_get(

1855

session._c_object)

1856

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

1857

# ...do the normal thing

1858

return session.peer_certificate

2319

1859

list_size = ctypes.c_uint(1)

2320

cert_list = (gnutls.certificate_get_peers

1860

cert_list = (gnutls.library.functions

1861

.gnutls_certificate_get_peers

2321

1862

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

2322

1863

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

2323

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

1864

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

1865

" certificate")

2324

1866

if list_size.value == 0:

2325

1867

return None

2326

1868

cert = cert_list[0]

2330

1872

def fingerprint(openpgp):

2331

1873

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

2332

1874

# New GnuTLS "datum" with the OpenPGP public key

2333

datum = gnutls.datum_t(

1875

datum = gnutls.library.types.gnutls_datum_t(

2334

1876

ctypes.cast(ctypes.c_char_p(openpgp),

2335

1877

ctypes.POINTER(ctypes.c_ubyte)),

2336

1878

ctypes.c_uint(len(openpgp)))

2337

1879

# New empty GnuTLS certificate

2338

crt = gnutls.openpgp_crt_t()

2339

gnutls.openpgp_crt_init(ctypes.byref(crt))

1880

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1881

gnutls.library.functions.gnutls_openpgp_crt_init(

1882

ctypes.byref(crt))

2340

1883

# Import the OpenPGP public key into the certificate

2341

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

2342

gnutls.OPENPGP_FMT_RAW)

1884

gnutls.library.functions.gnutls_openpgp_crt_import(

1885

crt, ctypes.byref(datum),

1886

gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)

2343

1887

# Verify the self signature in the key

2344

1888

crtverify = ctypes.c_uint()

2345

gnutls.openpgp_crt_verify_self(crt, 0,

2346

ctypes.byref(crtverify))

1889

gnutls.library.functions.gnutls_openpgp_crt_verify_self(

1890

crt, 0, ctypes.byref(crtverify))

2347

1891

if crtverify.value != 0:

2348

gnutls.openpgp_crt_deinit(crt)

2349

raise gnutls.CertificateSecurityError("Verify failed")

1892

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1893

raise gnutls.errors.CertificateSecurityError(

1894

"Verify failed")

2350

1895

# New buffer for the fingerprint

2351

1896

buf = ctypes.create_string_buffer(20)

2352

1897

buf_len = ctypes.c_size_t()

2353

1898

# Get the fingerprint from the certificate into the buffer

2354

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

2355

ctypes.byref(buf_len))

1899

gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint(

1900

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

2356

1901

# Deinit the certificate

2357

gnutls.openpgp_crt_deinit(crt)

1902

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2358

1903

# Convert the buffer to a Python bytestring

2359

1904

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

2360

1905

# Convert the bytestring to hexadecimal notation

2453

1998

"""This overrides the normal server_bind() function

2454

1999

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

2455

2000

bind to an address or port if they were not specified."""

2456

global SO_BINDTODEVICE

2457

2001

if self.interface is not None:

2458

2002

if SO_BINDTODEVICE is None:

2459

# Fall back to a hard-coded value which seems to be

2460

# common enough.

2461

logger.warning("SO_BINDTODEVICE not found, trying 25")

2462

SO_BINDTODEVICE = 25

2463

try:

2464

self.socket.setsockopt(

2465

socket.SOL_SOCKET, SO_BINDTODEVICE,

2466

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

2467

except socket.error as error:

2468

if error.errno == errno.EPERM:

2469

logger.error("No permission to bind to"

2470

" interface %s", self.interface)

2471

elif error.errno == errno.ENOPROTOOPT:

2472

logger.error("SO_BINDTODEVICE not available;"

2473

" cannot bind to interface %s",

2474

self.interface)

2475

elif error.errno == errno.ENODEV:

2476

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

2477

" cannot bind", self.interface)

2478

else:

2479

raise

2003

logger.error("SO_BINDTODEVICE does not exist;"

2004

" cannot bind to interface %s",

2005

self.interface)

2006

else:

2007

try:

2008

self.socket.setsockopt(

2009

socket.SOL_SOCKET, SO_BINDTODEVICE,

2010

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

2011

except socket.error as error:

2012

if error.errno == errno.EPERM:

2013

logger.error("No permission to bind to"

2014

" interface %s", self.interface)

2015

elif error.errno == errno.ENOPROTOOPT:

2016

logger.error("SO_BINDTODEVICE not available;"

2017

" cannot bind to interface %s",

2018

self.interface)

2019

elif error.errno == errno.ENODEV:

2020

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

2021

" cannot bind", self.interface)

2022

else:

2023

raise

2480

2024

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

2481

2025

if self.server_address[0] or self.server_address[1]:

2482

2026

if not self.server_address[0]:

2505

2049

gnutls_priority GnuTLS priority string

2506

2050

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

2507

2051

2508

Assumes a GLib.MainLoop event loop.

2052

Assumes a gobject.MainLoop event loop.

2509

2053

"""

2510

2054

2511

2055

def __init__(self, server_address, RequestHandlerClass,

2536

2080

2537

2081

def add_pipe(self, parent_pipe, proc):

2538

2082

# Call "handle_ipc" for both data and EOF events

2539

GLib.io_add_watch(

2083

gobject.io_add_watch(

2540

2084

parent_pipe.fileno(),

2541

GLib.IO_IN | GLib.IO_HUP,

2085

gobject.IO_IN | gobject.IO_HUP,

2542

2086

functools.partial(self.handle_ipc,

2543

2087

parent_pipe = parent_pipe,

2544

2088

proc = proc))

2548

2092

proc = None,

2549

2093

client_object=None):

2550

2094

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

2551

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

2095

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

2552

2096

# Wait for other process to exit

2553

2097

proc.join()

2554

2098

return False

2561

2105

fpr = request[1]

2562

2106

address = request[2]

2563

2107

2564

for c in self.clients.values():

2108

for c in self.clients.itervalues():

2565

2109

if c.fingerprint == fpr:

2566

2110

client = c

2567

2111

break

2575

2119

parent_pipe.send(False)

2576

2120

return False

2577

2121

2578

GLib.io_add_watch(

2122

gobject.io_add_watch(

2579

2123

parent_pipe.fileno(),

2580

GLib.IO_IN | GLib.IO_HUP,

2124

gobject.IO_IN | gobject.IO_HUP,

2581

2125

functools.partial(self.handle_ipc,

2582

2126

parent_pipe = parent_pipe,

2583

2127

proc = proc,

2597

2141

2598

2142

if command == 'getattr':

2599

2143

attrname = request[1]

2600

if isinstance(client_object.__getattribute__(attrname),

2601

collections.Callable):

2144

if callable(client_object.__getattribute__(attrname)):

2602

2145

parent_pipe.send(('function', ))

2603

2146

else:

2604

2147

parent_pipe.send((

2842

2385

"debug": "False",

2843

2386

"priority":

2844

2387

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

2845

":+SIGN-DSA-SHA256",

2388

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

2846

2389

"servicename": "Mandos",

2847

2390

"use_dbus": "True",

2848

2391

"use_ipv6": "True",

2965

2508

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

2966

2509

exc_info=e)

2967

2510

2968

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

2969

("mandos", "mandos"),

2970

("nobody", "nogroup")):

2511

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

2971

2512

try:

2972

2513

uid = pwd.getpwnam(name).pw_uid

2973

gid = pwd.getpwnam(group).pw_gid

2514

gid = pwd.getpwnam(name).pw_gid

2974

2515

break

2975

2516

except KeyError:

2976

2517

continue

2980

2521

try:

2981

2522

os.setgid(gid)

2982

2523

os.setuid(uid)

2983

if debug:

2984

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

2985

gid))

2986

2524

except OSError as error:

2987

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

2988

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

2989

2525

if error.errno != errno.EPERM:

2990

2526

raise

2991

2527

2994

2530

2995

2531

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

2996

2532

# - GnuTLS manual

2997

gnutls.global_set_log_level(11)

2533

gnutls.library.functions.gnutls_global_set_log_level(11)

2998

2534

2999

@gnutls.log_func

2535

@gnutls.library.types.gnutls_log_func

3000

2536

def debug_gnutls(level, string):

3001

2537

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

3002

2538

3003

gnutls.global_set_log_function(debug_gnutls)

2539

gnutls.library.functions.gnutls_global_set_log_function(

2540

debug_gnutls)

3004

2541

3005

2542

# Redirect stdin so all checkers get /dev/null

3006

2543

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

3013

2550

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

3014

2551

daemon()

3015

2552

3016

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

3017

# to inform GLib that threads will be used.

3018

GLib.threads_init()

2553

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

2554

# need to inform gobject that threads will be used.

2555

gobject.threads_init()

3019

2556

3020

2557

global main_loop

3021

2558

# From the Avahi example code

3022

2559

DBusGMainLoop(set_as_default=True)

3023

main_loop = GLib.MainLoop()

2560

main_loop = gobject.MainLoop()

3024

2561

bus = dbus.SystemBus()

3025

2562

# End of Avahi example code

3026

2563

if use_dbus:

3070

2607

if server_settings["restore"]:

3071

2608

try:

3072

2609

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

3073

if sys.version_info.major == 2:

3074

clients_data, old_client_settings = pickle.load(

3075

stored_state)

3076

else:

3077

bytes_clients_data, bytes_old_client_settings = (

3078

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

3079

### Fix bytes to strings

3080

## clients_data

3081

# .keys()

3082

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

3083

if isinstance(key, bytes)

3084

else key): value

3085

for key, value in

3086

bytes_clients_data.items() }

3087

del bytes_clients_data

3088

for key in clients_data:

3089

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

3090

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

3091

for k, v in

3092

clients_data[key].items() }

3093

clients_data[key] = value

3094

# .client_structure

3095

value["client_structure"] = [

3096

(s.decode("utf-8")

3097

if isinstance(s, bytes)

3098

else s) for s in

3099

value["client_structure"] ]

3100

# .name & .host

3101

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

3102

if isinstance(value[k], bytes):

3103

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

3104

## old_client_settings

3105

# .keys()

3106

old_client_settings = {

3107

(key.decode("utf-8")

3108

if isinstance(key, bytes)

3109

else key): value

3110

for key, value in

3111

bytes_old_client_settings.items() }

3112

del bytes_old_client_settings

3113

# .host

3114

for value in old_client_settings.values():

3115

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

3116

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

3117

.decode("utf-8"))

2610

clients_data, old_client_settings = pickle.load(

2611

stored_state)

3118

2612

os.remove(stored_state_path)

3119

2613

except IOError as e:

3120

2614

if e.errno == errno.ENOENT:

3153

2647

pass

3154

2648

3155

2649

# Clients who has passed its expire date can still be

3156

# enabled if its last checker was successful. A Client

2650

# enabled if its last checker was successful. Clients

3157

2651

# whose checker succeeded before we stored its state is

3158

2652

# assumed to have successfully run all checkers during

3159

2653

# downtime.

3221

2715

del pidfile

3222

2716

del pidfilename

3223

2717

3224

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

3225

GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,

3226

lambda: main_loop.quit() and False)

2718

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

2719

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

3227

2720

3228

2721

if use_dbus:

3229

2722

3230

2723

@alternate_dbus_interfaces(

3231

2724

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

3232

class MandosDBusService(DBusObjectWithObjectManager):

2725

class MandosDBusService(DBusObjectWithProperties):

3233

2726

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

3234

2727

3235

2728

def __init__(self):

3237

2730

3238

2731

_interface = "se.recompile.Mandos"

3239

2732

2733

@dbus_interface_annotations(_interface)

2734

def _foo(self):

2735

return {

2736

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

2737

"false" }

2738

3240

2739

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

3241

2740

def ClientAdded(self, objpath):

3242

2741

"D-Bus signal"

3247

2746

"D-Bus signal"

3248

2747

pass

3249

2748

3250

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

3251

"true"})

3252

2749

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

3253

2750

def ClientRemoved(self, objpath, name):

3254

2751

"D-Bus signal"

3255

2752

pass

3256

2753

3257

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

3258

"true"})

3259

2754

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

3260

2755

def GetAllClients(self):

3261

2756

"D-Bus method"

3262

2757

return dbus.Array(c.dbus_object_path for c in

3263

tcp_server.clients.values())

2758

tcp_server.clients.itervalues())

3264

2759

3265

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

3266

"true"})

3267

2760

@dbus.service.method(_interface,

3268

2761

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

3269

2762

def GetAllClientsWithProperties(self):

3270

2763

"D-Bus method"

3271

2764

return dbus.Dictionary(

3272

{ c.dbus_object_path: c.GetAll(

3273

"se.recompile.Mandos.Client")

3274

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

2765

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

2766

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

3275

2767

signature="oa{sv}")

3276

2768

3277

2769

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

3278

2770

def RemoveClient(self, object_path):

3279

2771

"D-Bus method"

3280

for c in tcp_server.clients.values():

2772

for c in tcp_server.clients.itervalues():

3281

2773

if c.dbus_object_path == object_path:

3282

2774

del tcp_server.clients[c.name]

3283

2775

c.remove_from_connection()

3284

# Don't signal the disabling

2776

# Don't signal anything except ClientRemoved

3285

2777

c.disable(quiet=True)

3286

# Emit D-Bus signal for removal

3287

self.client_removed_signal(c)

2778

# Emit D-Bus signal

2779

self.ClientRemoved(object_path, c.name)

3288

2780

return

3289

2781

raise KeyError(object_path)

3290

2782

3291

2783

del _interface

3292

3293

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

3294

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

3295

def GetManagedObjects(self):

3296

"""D-Bus method"""

3297

return dbus.Dictionary(

3298

{ client.dbus_object_path:

3299

dbus.Dictionary(

3300

{ interface: client.GetAll(interface)

3301

for interface in

3302

client._get_all_interface_names()})

3303

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

3304

3305

def client_added_signal(self, client):

3306

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

3307

if use_dbus:

3308

# New standard signal

3309

self.InterfacesAdded(

3310

client.dbus_object_path,

3311

dbus.Dictionary(

3312

{ interface: client.GetAll(interface)

3313

for interface in

3314

client._get_all_interface_names()}))

3315

# Old signal

3316

self.ClientAdded(client.dbus_object_path)

3317

3318

def client_removed_signal(self, client):

3319

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

3320

if use_dbus:

3321

# New standard signal

3322

self.InterfacesRemoved(

3323

client.dbus_object_path,

3324

client._get_all_interface_names())

3325

# Old signal

3326

self.ClientRemoved(client.dbus_object_path,

3327

client.name)

3328

2784

3329

2785

mandos_dbus_service = MandosDBusService()

3330

2786

3331

# Save modules to variables to exempt the modules from being

3332

# unloaded before the function registered with atexit() is run.

3333

mp = multiprocessing

3334

wn = wnull

3335

2787

def cleanup():

3336

2788

"Cleanup function; run on exit"

3337

2789

if zeroconf:

3338

2790

service.cleanup()

3339

2791

3340

mp.active_children()

3341

wn.close()

2792

multiprocessing.active_children()

2793

wnull.close()

3342

2794

if not (tcp_server.clients or client_settings):

3343

2795

return

3344

2796

3347

2799

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

3348

2800

clients = {}

3349

2801

with PGPEngine() as pgp:

3350

for client in tcp_server.clients.values():

2802

for client in tcp_server.clients.itervalues():

3351

2803

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

3352

2804

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

3353

2805

key)

3377

2829

prefix='clients-',

3378

2830

dir=os.path.dirname(stored_state_path),

3379

2831

delete=False) as stored_state:

3380

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

3381

protocol = 2)

2832

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

3382

2833

tempname = stored_state.name

3383

2834

os.rename(tempname, stored_state_path)

3384

2835

except (IOError, OSError) as e:

3400

2851

name, client = tcp_server.clients.popitem()

3401

2852

if use_dbus:

3402

2853

client.remove_from_connection()

3403

# Don't signal the disabling

2854

# Don't signal anything except ClientRemoved

3404

2855

client.disable(quiet=True)

3405

# Emit D-Bus signal for removal

3406

2856

if use_dbus:

3407

mandos_dbus_service.client_removed_signal(client)

2857

# Emit D-Bus signal

2858

mandos_dbus_service.ClientRemoved(

2859

client.dbus_object_path, client.name)

3408

2860

client_settings.clear()

3409

2861

3410

2862

atexit.register(cleanup)

3411

2863

3412

for client in tcp_server.clients.values():

2864

for client in tcp_server.clients.itervalues():

3413

2865

if use_dbus:

3414

# Emit D-Bus signal for adding

3415

mandos_dbus_service.client_added_signal(client)

2866

# Emit D-Bus signal

2867

mandos_dbus_service.ClientAdded(client.dbus_object_path)

3416

2868

# Need to initiate checking of clients

3417

2869

if client.enabled:

3418

2870

client.init_checker()

3444

2896

sys.exit(1)

3445

2897

# End of Avahi example code

3446

2898

3447

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

3448

lambda *args, **kwargs:

3449

(tcp_server.handle_request

3450

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

2899

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

2900

lambda *args, **kwargs:

2901

(tcp_server.handle_request

2902

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

3451

2903

3452

2904

logger.debug("Starting main loop")

3453

2905

main_loop.run()