/mandos/trunk : revision 868

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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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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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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 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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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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SO_BINDTODEVICE = None

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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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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 = "1.7.10"

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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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'--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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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(['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):

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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:],

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data_len)

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def bye(self):

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

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# Error handling functions

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def _error_code(result):

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

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

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# 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()

427

765

428

766

class Client(object):

429

767

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

435

773

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

436

774

to see if the client lives.

437

775

'None' if no process is running.

438

checker_callback_tag: a gobject event source tag, or None

776

checker_callback_tag: a GLib event source tag, or None

439

777

checker_command: string; External command which is run to check

440

778

if client lives. %() expansions are done at

441

779

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

442

780

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

443

checker_initiator_tag: a gobject event source tag, or None

781

checker_initiator_tag: a GLib event source tag, or None

444

782

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

445

783

client_structure: Object describing what attributes a client has

446

784

and is used for storing the client at exit

447

785

current_checker_command: string; current running checker_command

448

disable_initiator_tag: a gobject event source tag, or None

786

disable_initiator_tag: a GLib event source tag, or None

449

787

enabled: bool()

450

788

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

451

789

uniquely identify the client

456

794

last_checker_status: integer between 0 and 255 reflecting exit

457

795

status of last checker. -1 reflects crashed

458

796

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

459

799

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

460

800

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

461

801

D-Bus identifiers

512

852

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

513

853

.replace(" ", ""))

514

854

if "secret" in section:

515

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

855

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

856

.encode("utf-8"),

857

"base64")

516

858

elif "secfile" in section:

517

859

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

518

860

(section["secfile"])),

571

913

self.changedstate = multiprocessing_manager.Condition(

572

914

multiprocessing_manager.Lock())

573

915

self.client_structure = [attr

574

for attr in self.__dict__.iterkeys()

916

for attr in self.__dict__.keys()

575

917

if not attr.startswith("_")]

576

918

self.client_structure.append("client_structure")

577

919

603

945

if not quiet:

604

946

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

605

947

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

606

gobject.source_remove(self.disable_initiator_tag)

948

GLib.source_remove(self.disable_initiator_tag)

607

949

self.disable_initiator_tag = None

608

950

self.expires = None

609

951

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

610

gobject.source_remove(self.checker_initiator_tag)

952

GLib.source_remove(self.checker_initiator_tag)

611

953

self.checker_initiator_tag = None

612

954

self.stop_checker()

613

955

self.enabled = False

614

956

if not quiet:

615

957

self.send_changedstate()

616

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

958

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

617

959

return False

618

960

619

961

def __del__(self):

623

965

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

624

966

# and every interval from then on.

625

967

if self.checker_initiator_tag is not None:

626

gobject.source_remove(self.checker_initiator_tag)

627

self.checker_initiator_tag = gobject.timeout_add(

968

GLib.source_remove(self.checker_initiator_tag)

969

self.checker_initiator_tag = GLib.timeout_add(

628

970

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

629

971

self.start_checker)

630

972

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

631

973

if self.disable_initiator_tag is not None:

632

gobject.source_remove(self.disable_initiator_tag)

633

self.disable_initiator_tag = gobject.timeout_add(

974

GLib.source_remove(self.disable_initiator_tag)

975

self.disable_initiator_tag = GLib.timeout_add(

634

976

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

635

977

# Also start a new checker *right now*.

636

978

self.start_checker()

637

979

638

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

980

def checker_callback(self, source, condition, connection,

981

command):

639

982

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

640

983

self.checker_callback_tag = None

641

984

self.checker = None

642

if os.WIFEXITED(condition):

643

self.last_checker_status = os.WEXITSTATUS(condition)

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

644

992

if self.last_checker_status == 0:

645

993

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

646

994

vars(self))

649

997

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

650

998

else:

651

999

self.last_checker_status = -1

1000

self.last_checker_signal = -returncode

652

1001

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

653

1002

vars(self))

1003

return False

654

1004

655

1005

def checked_ok(self):

656

1006

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

657

1007

self.last_checked_ok = datetime.datetime.utcnow()

658

1008

self.last_checker_status = 0

1009

self.last_checker_signal = None

659

1010

self.bump_timeout()

660

1011

661

1012

def bump_timeout(self, timeout=None):

663

1014

if timeout is None:

664

1015

timeout = self.timeout

665

1016

if self.disable_initiator_tag is not None:

666

gobject.source_remove(self.disable_initiator_tag)

1017

GLib.source_remove(self.disable_initiator_tag)

667

1018

self.disable_initiator_tag = None

668

1019

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

669

self.disable_initiator_tag = gobject.timeout_add(

1020

self.disable_initiator_tag = GLib.timeout_add(

670

1021

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

671

1022

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

672

1023

687

1038

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

688

1039

# should be.

689

1040

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)

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

704

1045

# Start a new checker if needed

705

1046

if self.checker is None:

706

1047

# Escape attributes for the shell

715

1056

exc_info=error)

716

1057

return True # Try again later

717

1058

self.current_checker_command = command

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

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

759

1085

return True

760

1086

761

1087

def stop_checker(self):

762

1088

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

763

1089

if self.checker_callback_tag:

764

gobject.source_remove(self.checker_callback_tag)

1090

GLib.source_remove(self.checker_callback_tag)

765

1091

self.checker_callback_tag = None

766

1092

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

767

1093

return

768

1094

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

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

1095

self.checker.terminate()

777

1096

self.checker = None

778

1097

779

1098

843

1162

access="r")

844

1163

def Property_dbus_property(self):

845

1164

return dbus.Boolean(False)

1165

1166

See also the DBusObjectWithAnnotations class.

846

1167

"""

847

1168

848

1169

def decorator(func):

870

1191

pass

871

1192

872

1193

873

class DBusObjectWithProperties(dbus.service.Object):

874

"""A D-Bus object with properties.

1194

class DBusObjectWithAnnotations(dbus.service.Object):

1195

"""A D-Bus object with annotations.

875

1196

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.

1197

Classes inheriting from this can use the dbus_annotations

1198

decorator to add annotations to methods or signals.

879

1199

"""

880

1200

881

1201

@staticmethod

897

1217

for name, athing in

898

1218

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

899

1219

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

900

1291

def _get_dbus_property(self, interface_name, property_name):

901

1292

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

902

1293

property with the specified name and interface.

912

1303

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

913

1304

self.dbus_object_path, interface_name, property_name))

914

1305

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

915

1315

@dbus.service.method(dbus.PROPERTIES_IFACE,

916

1316

in_signature="ss",

917

1317

out_signature="v")

987

1387

988

1388

Inserts property tags and interface annotation tags.

989

1389

"""

990

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

991

connection)

1390

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1391

object_path,

1392

connection)

992

1393

try:

993

1394

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

994

1395

1007

1408

if prop._dbus_interface

1008

1409

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

1009

1410

if_tag.appendChild(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)

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)

1039

1427

# Add the names to the return values for the

1040

1428

# "org.freedesktop.DBus.Properties" methods

1041

1429

if (if_tag.getAttribute("name")

1059

1447

exc_info=error)

1060

1448

return xmlstring

1061

1449

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

1062

1518

1063

1519

def datetime_to_dbus(dt, variant_level=0):

1064

1520

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

1113

1569

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

1114

1570

# Extract the original non-method undecorated

1115

1571

# function by black magic

1116

nonmethod_func = (dict(

1117

zip(attribute.func_code.co_freevars,

1118

attribute.__closure__))

1119

["func"].cell_contents)

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)

1120

1582

# Create a new, but exactly alike, function

1121

1583

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

1122

1584

# with the alternate D-Bus interface name

1585

new_function = copy_function(nonmethod_func)

1123

1586

new_function = (dbus.service.signal(

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)))

1587

alt_interface,

1588

attribute._dbus_signature)(new_function))

1131

1589

# Copy annotations, if any

1132

1590

try:

1133

1591

new_function._dbus_annotations = dict(

1143

1601

func1 and func2 to the "call_both" function

1144

1602

outside of its arguments"""

1145

1603

1604

@functools.wraps(func2)

1146

1605

def call_both(*args, **kwargs):

1147

1606

"""This function will emit two D-Bus

1148

1607

signals by calling func1 and func2"""

1149

1608

func1(*args, **kwargs)

1150

1609

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)

1151

1614

1152

1615

return call_both

1153

1616

# Create the "call_both" function and add it to

1164

1627

alt_interface,

1165

1628

attribute._dbus_in_signature,

1166

1629

attribute._dbus_out_signature)

1167

(types.FunctionType(attribute.func_code,

1168

attribute.func_globals,

1169

attribute.func_name,

1170

attribute.func_defaults,

1171

attribute.func_closure)))

1630

(copy_function(attribute)))

1172

1631

# Copy annotations, if any

1173

1632

try:

1174

1633

attr[attrname]._dbus_annotations = dict(

1186

1645

attribute._dbus_access,

1187

1646

attribute._dbus_get_args_options

1188

1647

["byte_arrays"])

1189

(types.FunctionType(

1190

attribute.func_code,

1191

attribute.func_globals,

1192

attribute.func_name,

1193

attribute.func_defaults,

1194

attribute.func_closure)))

1648

(copy_function(attribute)))

1195

1649

# Copy annotations, if any

1196

1650

try:

1197

1651

attr[attrname]._dbus_annotations = dict(

1206

1660

# to the class.

1207

1661

attr[attrname] = (

1208

1662

dbus_interface_annotations(alt_interface)

1209

(types.FunctionType(attribute.func_code,

1210

attribute.func_globals,

1211

attribute.func_name,

1212

attribute.func_defaults,

1213

attribute.func_closure)))

1663

(copy_function(attribute)))

1214

1664

if deprecate:

1215

1665

# Deprecate all alternate interfaces

1216

1666

iname="_AlternateDBusNames_interface_annotation{}"

1229

1679

if interface_names:

1230

1680

# Replace the class with a new subclass of it with

1231

1681

# methods, signals, etc. as created above.

1232

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

1233

(cls, ), attr)

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)

1234

1688

return cls

1235

1689

1236

1690

return wrapper

1356

1810

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

1357

1811

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

1358

1812

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)

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:

1365

1820

# Emit D-Bus signal

1366

1821

self.CheckerCompleted(dbus.Int16(exitstatus),

1367

dbus.Int64(condition),

1822

# This is specific to GNU libC

1823

dbus.Int64(exitstatus << 8),

1368

1824

dbus.String(command))

1369

1825

else:

1370

1826

# Emit D-Bus signal

1371

1827

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

1372

dbus.Int64(condition),

1828

dbus.Int64(

1829

# This is specific to GNU libC

1830

(exitstatus << 8)

1831

| self.last_checker_signal),

1373

1832

dbus.String(command))

1374

1375

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

1376

*args, **kwargs)

1833

return ret

1377

1834

1378

1835

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

1379

1836

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

1391

1848

1392

1849

def approve(self, value=True):

1393

1850

self.approved = value

1394

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

1395

* 1000), self._reset_approved)

1851

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

1852

* 1000), self._reset_approved)

1396

1853

self.send_changedstate()

1397

1854

1398

1855

## D-Bus methods, signals & properties

1454

1911

self.checked_ok()

1455

1912

1456

1913

# Enable - method

1914

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

1457

1915

@dbus.service.method(_interface)

1458

1916

def Enable(self):

1459

1917

"D-Bus method"

1460

1918

self.enable()

1461

1919

1462

1920

# StartChecker - method

1921

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

1463

1922

@dbus.service.method(_interface)

1464

1923

def StartChecker(self):

1465

1924

"D-Bus method"

1466

1925

self.start_checker()

1467

1926

1468

1927

# Disable - method

1928

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

1469

1929

@dbus.service.method(_interface)

1470

1930

def Disable(self):

1471

1931

"D-Bus method"

1472

1932

self.disable()

1473

1933

1474

1934

# StopChecker - method

1935

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

1475

1936

@dbus.service.method(_interface)

1476

1937

def StopChecker(self):

1477

1938

self.stop_checker()

1513

1974

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

1514

1975

1515

1976

# Name - property

1977

@dbus_annotations(

1978

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

1516

1979

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

1517

1980

def Name_dbus_property(self):

1518

1981

return dbus.String(self.name)

1519

1982

1520

1983

# Fingerprint - property

1984

@dbus_annotations(

1985

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

1521

1986

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

1522

1987

def Fingerprint_dbus_property(self):

1523

1988

return dbus.String(self.fingerprint)

1532

1997

self.host = str(value)

1533

1998

1534

1999

# Created - property

2000

@dbus_annotations(

2001

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

1535

2002

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

1536

2003

def Created_dbus_property(self):

1537

2004

return datetime_to_dbus(self.created)

1598

2065

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

1599

2066

is None):

1600

2067

return

1601

gobject.source_remove(self.disable_initiator_tag)

1602

self.disable_initiator_tag = gobject.timeout_add(

2068

GLib.source_remove(self.disable_initiator_tag)

2069

self.disable_initiator_tag = GLib.timeout_add(

1603

2070

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

1604

2071

self.disable)

1605

2072

1625

2092

return

1626

2093

if self.enabled:

1627

2094

# Reschedule checker run

1628

gobject.source_remove(self.checker_initiator_tag)

1629

self.checker_initiator_tag = gobject.timeout_add(

2095

GLib.source_remove(self.checker_initiator_tag)

2096

self.checker_initiator_tag = GLib.timeout_add(

1630

2097

value, self.start_checker)

1631

2098

self.start_checker() # Start one now, too

1632

2099

1652

2119

self.stop_checker()

1653

2120

1654

2121

# ObjectPath - property

2122

@dbus_annotations(

2123

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

2124

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

1655

2125

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

1656

2126

def ObjectPath_dbus_property(self):

1657

2127

return self.dbus_object_path # is already a dbus.ObjectPath

1658

2128

1659

2129

# Secret = property

2130

@dbus_annotations(

2131

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

2132

"invalidates"})

1660

2133

@dbus_service_property(_interface,

1661

2134

signature="ay",

1662

2135

access="write",

1672

2145

self._pipe = child_pipe

1673

2146

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

1674

2147

if not self._pipe.recv():

1675

raise KeyError()

2148

raise KeyError(fpr)

1676

2149

1677

2150

def __getattribute__(self, name):

1678

2151

if name == '_pipe':

1708

2181

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

1709

2182

self.server.child_pipe.fileno())

1710

2183

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.

2184

session = gnutls.ClientSession(self.request)

1718

2185

1719

2186

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

1720

2187

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

1724

2191

priority = self.server.gnutls_priority

1725

2192

if priority is None:

1726

2193

priority = "NORMAL"

1727

gnutls.library.functions.gnutls_priority_set_direct(

1728

session._c_object, priority, None)

2194

gnutls.priority_set_direct(session._c_object,

2195

priority.encode("utf-8"),

2196

None)

1729

2197

1730

2198

# Start communication using the Mandos protocol

1731

2199

# Get protocol number

1741

2209

# Start GnuTLS connection

1742

2210

try:

1743

2211

session.handshake()

1744

except gnutls.errors.GNUTLSError as error:

2212

except gnutls.Error as error:

1745

2213

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

1746

2214

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

1747

2215

# established. Just abandon the request.

1753

2221

try:

1754

2222

fpr = self.fingerprint(

1755

2223

self.peer_certificate(session))

1756

except (TypeError,

1757

gnutls.errors.GNUTLSError) as error:

2224

except (TypeError, gnutls.Error) as error:

1758

2225

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

1759

2226

return

1760

2227

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

1818

2285

else:

1819

2286

delay -= time2 - time

1820

2287

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

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

1833

2294

1834

2295

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

1835

2296

# bump the timeout using extended_timeout

1843

2304

client.approvals_pending -= 1

1844

2305

try:

1845

2306

session.bye()

1846

except gnutls.errors.GNUTLSError as error:

2307

except gnutls.Error as error:

1847

2308

logger.warning("GnuTLS bye failed",

1848

2309

exc_info=error)

1849

2310

1851

2312

def peer_certificate(session):

1852

2313

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

1853

2314

# If not an OpenPGP certificate...

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

2315

if (gnutls.certificate_type_get(session._c_object)

2316

!= gnutls.CRT_OPENPGP):

2317

# ...return invalid data

2318

return b""

1859

2319

list_size = ctypes.c_uint(1)

1860

cert_list = (gnutls.library.functions

1861

.gnutls_certificate_get_peers

2320

cert_list = (gnutls.certificate_get_peers

1862

2321

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

1863

2322

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

1864

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

1865

" certificate")

2323

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

1866

2324

if list_size.value == 0:

1867

2325

return None

1868

2326

cert = cert_list[0]

1872

2330

def fingerprint(openpgp):

1873

2331

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

1874

2332

# New GnuTLS "datum" with the OpenPGP public key

1875

datum = gnutls.library.types.gnutls_datum_t(

2333

datum = gnutls.datum_t(

1876

2334

ctypes.cast(ctypes.c_char_p(openpgp),

1877

2335

ctypes.POINTER(ctypes.c_ubyte)),

1878

2336

ctypes.c_uint(len(openpgp)))

1879

2337

# New empty GnuTLS certificate

1880

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1881

gnutls.library.functions.gnutls_openpgp_crt_init(

1882

ctypes.byref(crt))

2338

crt = gnutls.openpgp_crt_t()

2339

gnutls.openpgp_crt_init(ctypes.byref(crt))

1883

2340

# Import the OpenPGP public key into the certificate

1884

gnutls.library.functions.gnutls_openpgp_crt_import(

1885

crt, ctypes.byref(datum),

1886

gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)

2341

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

2342

gnutls.OPENPGP_FMT_RAW)

1887

2343

# Verify the self signature in the key

1888

2344

crtverify = ctypes.c_uint()

1889

gnutls.library.functions.gnutls_openpgp_crt_verify_self(

1890

crt, 0, ctypes.byref(crtverify))

2345

gnutls.openpgp_crt_verify_self(crt, 0,

2346

ctypes.byref(crtverify))

1891

2347

if crtverify.value != 0:

1892

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1893

raise gnutls.errors.CertificateSecurityError(

1894

"Verify failed")

2348

gnutls.openpgp_crt_deinit(crt)

2349

raise gnutls.CertificateSecurityError("Verify failed")

1895

2350

# New buffer for the fingerprint

1896

2351

buf = ctypes.create_string_buffer(20)

1897

2352

buf_len = ctypes.c_size_t()

1898

2353

# Get the fingerprint from the certificate into the buffer

1899

gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint(

1900

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

2354

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

2355

ctypes.byref(buf_len))

1901

2356

# Deinit the certificate

1902

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2357

gnutls.openpgp_crt_deinit(crt)

1903

2358

# Convert the buffer to a Python bytestring

1904

2359

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

1905

2360

# Convert the bytestring to hexadecimal notation

1998

2453

"""This overrides the normal server_bind() function

1999

2454

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

2000

2455

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

2456

global SO_BINDTODEVICE

2001

2457

if self.interface is not None:

2002

2458

if SO_BINDTODEVICE is None:

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

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

2024

2480

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

2025

2481

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

2026

2482

if not self.server_address[0]:

2049

2505

gnutls_priority GnuTLS priority string

2050

2506

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

2051

2507

2052

Assumes a gobject.MainLoop event loop.

2508

Assumes a GLib.MainLoop event loop.

2053

2509

"""

2054

2510

2055

2511

def __init__(self, server_address, RequestHandlerClass,

2080

2536

2081

2537

def add_pipe(self, parent_pipe, proc):

2082

2538

# Call "handle_ipc" for both data and EOF events

2083

gobject.io_add_watch(

2539

GLib.io_add_watch(

2084

2540

parent_pipe.fileno(),

2085

gobject.IO_IN | gobject.IO_HUP,

2541

GLib.IO_IN | GLib.IO_HUP,

2086

2542

functools.partial(self.handle_ipc,

2087

2543

parent_pipe = parent_pipe,

2088

2544

proc = proc))

2092

2548

proc = None,

2093

2549

client_object=None):

2094

2550

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

2095

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

2551

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

2096

2552

# Wait for other process to exit

2097

2553

proc.join()

2098

2554

return False

2105

2561

fpr = request[1]

2106

2562

address = request[2]

2107

2563

2108

for c in self.clients.itervalues():

2564

for c in self.clients.values():

2109

2565

if c.fingerprint == fpr:

2110

2566

client = c

2111

2567

break

2119

2575

parent_pipe.send(False)

2120

2576

return False

2121

2577

2122

gobject.io_add_watch(

2578

GLib.io_add_watch(

2123

2579

parent_pipe.fileno(),

2124

gobject.IO_IN | gobject.IO_HUP,

2580

GLib.IO_IN | GLib.IO_HUP,

2125

2581

functools.partial(self.handle_ipc,

2126

2582

parent_pipe = parent_pipe,

2127

2583

proc = proc,

2141

2597

2142

2598

if command == 'getattr':

2143

2599

attrname = request[1]

2144

if callable(client_object.__getattribute__(attrname)):

2600

if isinstance(client_object.__getattribute__(attrname),

2601

collections.Callable):

2145

2602

parent_pipe.send(('function', ))

2146

2603

else:

2147

2604

parent_pipe.send((

2182

2639

# avoid excessive use of external libraries.

2183

2640

2184

2641

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

2185

Token = collections.namedtuple("Token",

2186

("regexp", # To match token; if

2187

# "value" is not None,

2188

# must have a "group"

2189

# containing digits

2190

"value", # datetime.timedelta or

2191

# None

2192

"followers")) # Tokens valid after

2193

# this token

2194

2642

Token = collections.namedtuple("Token", (

2195

2643

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

2196

2644

# a "group" containing digits

2231

2679

# Define starting values

2232

2680

value = datetime.timedelta() # Value so far

2233

2681

found_token = None

2234

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

2682

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

2235

2683

s = duration # String left to parse

2236

2684

# Loop until end token is found

2237

2685

while found_token is not token_end:

2254

2702

break

2255

2703

else:

2256

2704

# No currently valid tokens were found

2257

raise ValueError("Invalid RFC 3339 duration")

2705

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

2706

.format(duration))

2258

2707

# End token found

2259

2708

return value

2260

2709

2393

2842

"debug": "False",

2394

2843

"priority":

2395

2844

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

2396

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

2845

":+SIGN-DSA-SHA256",

2397

2846

"servicename": "Mandos",

2398

2847

"use_dbus": "True",

2399

2848

"use_ipv6": "True",

2516

2965

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

2517

2966

exc_info=e)

2518

2967

2519

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

2968

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

2969

("mandos", "mandos"),

2970

("nobody", "nogroup")):

2520

2971

try:

2521

2972

uid = pwd.getpwnam(name).pw_uid

2522

gid = pwd.getpwnam(name).pw_gid

2973

gid = pwd.getpwnam(group).pw_gid

2523

2974

break

2524

2975

except KeyError:

2525

2976

continue

2529

2980

try:

2530

2981

os.setgid(gid)

2531

2982

os.setuid(uid)

2983

if debug:

2984

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

2985

gid))

2532

2986

except OSError as error:

2987

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

2988

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

2533

2989

if error.errno != errno.EPERM:

2534

2990

raise

2535

2991

2538

2994

2539

2995

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

2540

2996

# - GnuTLS manual

2541

gnutls.library.functions.gnutls_global_set_log_level(11)

2997

gnutls.global_set_log_level(11)

2542

2998

2543

@gnutls.library.types.gnutls_log_func

2999

@gnutls.log_func

2544

3000

def debug_gnutls(level, string):

2545

3001

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

2546

3002

2547

gnutls.library.functions.gnutls_global_set_log_function(

2548

debug_gnutls)

3003

gnutls.global_set_log_function(debug_gnutls)

2549

3004

2550

3005

# Redirect stdin so all checkers get /dev/null

2551

3006

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

2558

3013

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

2559

3014

daemon()

2560

3015

2561

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

2562

# need to inform gobject that threads will be used.

2563

gobject.threads_init()

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()

2564

3019

2565

3020

global main_loop

2566

3021

# From the Avahi example code

2567

3022

DBusGMainLoop(set_as_default=True)

2568

main_loop = gobject.MainLoop()

3023

main_loop = GLib.MainLoop()

2569

3024

bus = dbus.SystemBus()

2570

3025

# End of Avahi example code

2571

3026

if use_dbus:

2615

3070

if server_settings["restore"]:

2616

3071

try:

2617

3072

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

2618

clients_data, old_client_settings = pickle.load(

2619

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"))

2620

3118

os.remove(stored_state_path)

2621

3119

except IOError as e:

2622

3120

if e.errno == errno.ENOENT:

2655

3153

pass

2656

3154

2657

3155

# Clients who has passed its expire date can still be

2658

# enabled if its last checker was successful. Clients

3156

# enabled if its last checker was successful. A Client

2659

3157

# whose checker succeeded before we stored its state is

2660

3158

# assumed to have successfully run all checkers during

2661

3159

# downtime.

2723

3221

del pidfile

2724

3222

del pidfilename

2725

3223

2726

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

2727

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

3224

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

3225

GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,

3226

lambda: main_loop.quit() and False)

2728

3227

2729

3228

if use_dbus:

2730

3229

2731

3230

@alternate_dbus_interfaces(

2732

3231

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

2733

class MandosDBusService(DBusObjectWithProperties):

3232

class MandosDBusService(DBusObjectWithObjectManager):

2734

3233

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

2735

3234

2736

3235

def __init__(self):

2738

3237

2739

3238

_interface = "se.recompile.Mandos"

2740

3239

2741

@dbus_interface_annotations(_interface)

2742

def _foo(self):

2743

return {

2744

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

2745

"false" }

2746

2747

3240

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

2748

3241

def ClientAdded(self, objpath):

2749

3242

"D-Bus signal"

2754

3247

"D-Bus signal"

2755

3248

pass

2756

3249

3250

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

3251

"true"})

2757

3252

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

2758

3253

def ClientRemoved(self, objpath, name):

2759

3254

"D-Bus signal"

2760

3255

pass

2761

3256

3257

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

3258

"true"})

2762

3259

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

2763

3260

def GetAllClients(self):

2764

3261

"D-Bus method"

2765

3262

return dbus.Array(c.dbus_object_path for c in

2766

tcp_server.clients.itervalues())

3263

tcp_server.clients.values())

2767

3264

3265

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

3266

"true"})

2768

3267

@dbus.service.method(_interface,

2769

3268

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

2770

3269

def GetAllClientsWithProperties(self):

2771

3270

"D-Bus method"

2772

3271

return dbus.Dictionary(

2773

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

2774

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

3272

{ c.dbus_object_path: c.GetAll(

3273

"se.recompile.Mandos.Client")

3274

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

2775

3275

signature="oa{sv}")

2776

3276

2777

3277

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

2778

3278

def RemoveClient(self, object_path):

2779

3279

"D-Bus method"

2780

for c in tcp_server.clients.itervalues():

3280

for c in tcp_server.clients.values():

2781

3281

if c.dbus_object_path == object_path:

2782

3282

del tcp_server.clients[c.name]

2783

3283

c.remove_from_connection()

2784

# Don't signal anything except ClientRemoved

3284

# Don't signal the disabling

2785

3285

c.disable(quiet=True)

2786

# Emit D-Bus signal

2787

self.ClientRemoved(object_path, c.name)

3286

# Emit D-Bus signal for removal

3287

self.client_removed_signal(c)

2788

3288

return

2789

3289

raise KeyError(object_path)

2790

3290

2791

3291

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)

2792

3328

2793

3329

mandos_dbus_service = MandosDBusService()

2794

3330

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

2795

3335

def cleanup():

2796

3336

"Cleanup function; run on exit"

2797

3337

if zeroconf:

2798

3338

service.cleanup()

2799

3339

2800

multiprocessing.active_children()

2801

wnull.close()

3340

mp.active_children()

3341

wn.close()

2802

3342

if not (tcp_server.clients or client_settings):

2803

3343

return

2804

3344

2807

3347

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

2808

3348

clients = {}

2809

3349

with PGPEngine() as pgp:

2810

for client in tcp_server.clients.itervalues():

3350

for client in tcp_server.clients.values():

2811

3351

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

2812

3352

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

2813

3353

key)

2837

3377

prefix='clients-',

2838

3378

dir=os.path.dirname(stored_state_path),

2839

3379

delete=False) as stored_state:

2840

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

3380

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

3381

protocol = 2)

2841

3382

tempname = stored_state.name

2842

3383

os.rename(tempname, stored_state_path)

2843

3384

except (IOError, OSError) as e:

2859

3400

name, client = tcp_server.clients.popitem()

2860

3401

if use_dbus:

2861

3402

client.remove_from_connection()

2862

# Don't signal anything except ClientRemoved

3403

# Don't signal the disabling

2863

3404

client.disable(quiet=True)

3405

# Emit D-Bus signal for removal

2864

3406

if use_dbus:

2865

# Emit D-Bus signal

2866

mandos_dbus_service.ClientRemoved(

2867

client.dbus_object_path, client.name)

3407

mandos_dbus_service.client_removed_signal(client)

2868

3408

client_settings.clear()

2869

3409

2870

3410

atexit.register(cleanup)

2871

3411

2872

for client in tcp_server.clients.itervalues():

3412

for client in tcp_server.clients.values():

2873

3413

if use_dbus:

2874

# Emit D-Bus signal

2875

mandos_dbus_service.ClientAdded(client.dbus_object_path)

3414

# Emit D-Bus signal for adding

3415

mandos_dbus_service.client_added_signal(client)

2876

3416

# Need to initiate checking of clients

2877

3417

if client.enabled:

2878

3418

client.init_checker()

2904

3444

sys.exit(1)

2905

3445

# End of Avahi example code

2906

3446

2907

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

2908

lambda *args, **kwargs:

2909

(tcp_server.handle_request

2910

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

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))

2911

3451

2912

3452

logger.debug("Starting main loop")

2913

3453

main_loop.run()