/mandos/release : revision 237.7.471

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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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#

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

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#

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#

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# This program is partly derived from an example program for an Avahi

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# service publisher, downloaded from

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# <http://avahi.org/wiki/PythonPublishExample>. This includes the

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# methods "add", "remove", "server_state_changed",

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# "entry_group_state_changed", "cleanup", and "activate" in the

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

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#

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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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#

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# This file is part of Mandos.

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#

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

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

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# the Free Software Foundation, either version 3 of the License, or

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# (at your option) any later version.

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#

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# This program is distributed in the hope that it will be useful,

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# but WITHOUT ANY WARRANTY; without even the implied warranty of

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# Mandos is distributed in the hope that it will be useful, but

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# WITHOUT ANY WARRANTY; without even the implied warranty of

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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

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# GNU General Public License for more details.

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#

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#

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# You should have received a copy of the GNU General Public License

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# along with this program. If not, see

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# <http://www.gnu.org/licenses/>.

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#

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# along with Mandos. If not, see <http://www.gnu.org/licenses/>.

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#

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# Contact the authors at <mandos@recompile.se>.

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#

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#

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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 tempfile

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import itertools

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import collections

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import codecs

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import dbus

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import dbus.service

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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 = "1.7.16"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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if_nametoindex = ctypes.cdll.LoadLibrary(

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

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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

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

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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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global syslogger

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syslogger = (logging.handlers.SysLogHandler(

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facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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address = "/dev/log"))

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facility=logging.handlers.SysLogHandler.LOG_DAEMON,

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address="/dev/log"))

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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

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class PGPEngine(object):

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"""A simple class for OpenPGP symmetric encryption & decryption"""

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def __init__(self):

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

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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for root, dirs, files in os.walk(self.tempdir,

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topdown = False):

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topdown=False):

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for filename in files:

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os.remove(os.path.join(root, filename))

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for dirname in dirs:

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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

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

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

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

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return encoded

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def encrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(

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dir=self.tempdir) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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proc = subprocess.Popen(['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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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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stdin=subprocess.PIPE,

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stdout=subprocess.PIPE,

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stderr=subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return ciphertext

216

257

217

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(

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dir = self.tempdir) as passfile:

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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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265

'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

230

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

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stdin=subprocess.PIPE,

269

stdout=subprocess.PIPE,

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stderr=subprocess.PIPE)

271

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

231

272

if proc.returncode != 0:

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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

278

class Avahi(object):

279

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

280

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

281

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

282

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

283

PROTO_INET = 0 # avahi-common/address.h

284

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"

287

DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"

288

DBUS_PATH_SERVER = "/"

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def string_array_to_txt_array(self, t):

291

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

292

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

293

ENTRY_GROUP_ESTABLISHED = 2 # avahi-common/defs.h

294

ENTRY_GROUP_COLLISION = 3 # avahi-common/defs.h

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ENTRY_GROUP_FAILURE = 4 # avahi-common/defs.h

296

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

300

SERVER_FAILURE = 4 # avahi-common/defs.h

301

avahi = Avahi()

302

303

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class AvahiError(Exception):

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

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306

self.value = value

250

318

251

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class AvahiService(object):

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"""An Avahi (Zeroconf) service.

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321

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Attributes:

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interface: integer; avahi.IF_UNSPEC or an interface index.

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324

Used to optionally bind to the specified interface.

268

336

server: D-Bus Server

269

337

bus: dbus.SystemBus()

270

338

"""

271

339

272

340

def __init__(self,

273

interface = avahi.IF_UNSPEC,

274

name = None,

275

servicetype = None,

276

port = None,

277

TXT = None,

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domain = "",

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host = "",

280

max_renames = 32768,

281

protocol = avahi.PROTO_UNSPEC,

282

bus = None):

341

interface=avahi.IF_UNSPEC,

342

name=None,

343

servicetype=None,

344

port=None,

345

TXT=None,

346

domain="",

347

host="",

348

max_renames=32768,

349

protocol=avahi.PROTO_UNSPEC,

350

bus=None):

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self.interface = interface

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self.name = name

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self.type = servicetype

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self.server = None

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self.bus = bus

296

364

self.entry_group_state_changed_match = None

297

365

298

366

def rename(self, remove=True):

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

300

368

if self.rename_count >= self.max_renames:

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

321

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self.cleanup()

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os._exit(1)

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def remove(self):

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

326

394

if self.entry_group_state_changed_match is not None:

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396

self.entry_group_state_changed_match = None

329

397

if self.group is not None:

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398

self.group.Reset()

331

399

332

400

def add(self):

333

401

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

334

402

self.remove()

351

419

dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

353

421

self.group.Commit()

354

422

355

423

def entry_group_state_changed(self, state, error):

356

424

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

357

425

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

358

426

359

427

if state == avahi.ENTRY_GROUP_ESTABLISHED:

360

428

logger.debug("Zeroconf service established.")

361

429

elif state == avahi.ENTRY_GROUP_COLLISION:

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433

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

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434

str(error))

367

435

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

368

436

369

437

def cleanup(self):

370

438

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

371

439

if self.group is not None:

376

444

pass

377

445

self.group = None

378

446

self.remove()

379

447

380

448

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

381

449

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

382

450

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

394

462

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

395

463

self.cleanup()

396

464

elif state == avahi.SERVER_RUNNING:

397

self.add()

465

try:

466

self.add()

467

except dbus.exceptions.DBusException as error:

468

if (error.get_dbus_name()

469

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

470

logger.info("Local Zeroconf service name"

471

" collision.")

472

return self.rename(remove=False)

473

else:

474

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

475

self.cleanup()

476

os._exit(1)

398

477

else:

399

478

if error is None:

400

479

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

401

480

else:

402

481

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

403

482

404

483

def activate(self):

405

484

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

406

485

if self.server is None:

417

496

class AvahiServiceToSyslog(AvahiService):

418

497

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

419

498

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

420

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

499

ret = super(AvahiServiceToSyslog, self).rename(self, *args,

500

**kwargs)

421

501

syslogger.setFormatter(logging.Formatter(

422

502

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

423

503

.format(self.name)))

424

504

return ret

425

505

426

def subprocess_call_pipe(connection, # : multiprocessing.Connection

427

*args, **kwargs):

506

507

# Pretend that we have a GnuTLS module

508

class GnuTLS(object):

509

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

510

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

511

512

library = ctypes.util.find_library("gnutls")

513

if library is None:

514

library = ctypes.util.find_library("gnutls-deb0")

515

_library = ctypes.cdll.LoadLibrary(library)

516

del library

517

_need_version = b"3.3.0"

518

519

def __init__(self):

520

# Need to use "self" here, since this method is called before

521

# the assignment to the "gnutls" global variable happens.

522

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

523

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

524

.format(self._need_version))

525

526

# Unless otherwise indicated, the constants and types below are

527

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

528

529

# Constants

530

E_SUCCESS = 0

531

E_INTERRUPTED = -52

532

E_AGAIN = -28

533

CRT_OPENPGP = 2

534

CLIENT = 2

535

SHUT_RDWR = 0

536

CRD_CERTIFICATE = 1

537

E_NO_CERTIFICATE_FOUND = -49

538

OPENPGP_FMT_RAW = 0 # gnutls/openpgp.h

539

540

# Types

541

class session_int(ctypes.Structure):

542

_fields_ = []

543

session_t = ctypes.POINTER(session_int)

544

545

class certificate_credentials_st(ctypes.Structure):

546

_fields_ = []

547

certificate_credentials_t = ctypes.POINTER(

548

certificate_credentials_st)

549

certificate_type_t = ctypes.c_int

550

551

class datum_t(ctypes.Structure):

552

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

553

('size', ctypes.c_uint)]

554

555

class openpgp_crt_int(ctypes.Structure):

556

_fields_ = []

557

openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)

558

openpgp_crt_fmt_t = ctypes.c_int # gnutls/openpgp.h

559

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

560

credentials_type_t = ctypes.c_int

561

transport_ptr_t = ctypes.c_void_p

562

close_request_t = ctypes.c_int

563

564

# Exceptions

565

class Error(Exception):

566

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

567

# exception might be raised from within GnuTLS.__init__,

568

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

569

# global variable has happened.

570

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

571

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

572

# code is passed, convert it to a string with

573

# gnutls.strerror()

574

self.code = code

575

if message is None and code is not None:

576

message = GnuTLS.strerror(code)

577

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

578

message, *args)

579

580

class CertificateSecurityError(Error):

581

pass

582

583

# Classes

584

class Credentials(object):

585

def __init__(self):

586

self._c_object = gnutls.certificate_credentials_t()

587

gnutls.certificate_allocate_credentials(

588

ctypes.byref(self._c_object))

589

self.type = gnutls.CRD_CERTIFICATE

590

591

def __del__(self):

592

gnutls.certificate_free_credentials(self._c_object)

593

594

class ClientSession(object):

595

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

596

self._c_object = gnutls.session_t()

597

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

598

gnutls.set_default_priority(self._c_object)

599

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

600

gnutls.handshake_set_private_extensions(self._c_object,

601

True)

602

self.socket = socket

603

if credentials is None:

604

credentials = gnutls.Credentials()

605

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

606

ctypes.cast(credentials._c_object,

607

ctypes.c_void_p))

608

self.credentials = credentials

609

610

def __del__(self):

611

gnutls.deinit(self._c_object)

612

613

def handshake(self):

614

return gnutls.handshake(self._c_object)

615

616

def send(self, data):

617

data = bytes(data)

618

data_len = len(data)

619

while data_len > 0:

620

data_len -= gnutls.record_send(self._c_object,

621

data[-data_len:],

622

data_len)

623

624

def bye(self):

625

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

626

627

# Error handling functions

628

def _error_code(result):

629

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

630

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

631

if result >= 0:

632

return result

633

if result == gnutls.E_NO_CERTIFICATE_FOUND:

634

raise gnutls.CertificateSecurityError(code=result)

635

raise gnutls.Error(code=result)

636

637

def _retry_on_error(result, func, arguments):

638

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

639

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

640

while result < 0:

641

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

642

return _error_code(result)

643

result = func(*arguments)

644

return result

645

646

# Unless otherwise indicated, the function declarations below are

647

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

648

649

# Functions

650

priority_set_direct = _library.gnutls_priority_set_direct

651

priority_set_direct.argtypes = [session_t, ctypes.c_char_p,

652

ctypes.POINTER(ctypes.c_char_p)]

653

priority_set_direct.restype = _error_code

654

655

init = _library.gnutls_init

656

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

657

init.restype = _error_code

658

659

set_default_priority = _library.gnutls_set_default_priority

660

set_default_priority.argtypes = [session_t]

661

set_default_priority.restype = _error_code

662

663

record_send = _library.gnutls_record_send

664

record_send.argtypes = [session_t, ctypes.c_void_p,

665

ctypes.c_size_t]

666

record_send.restype = ctypes.c_ssize_t

667

record_send.errcheck = _retry_on_error

668

669

certificate_allocate_credentials = (

670

_library.gnutls_certificate_allocate_credentials)

671

certificate_allocate_credentials.argtypes = [

672

ctypes.POINTER(certificate_credentials_t)]

673

certificate_allocate_credentials.restype = _error_code

674

675

certificate_free_credentials = (

676

_library.gnutls_certificate_free_credentials)

677

certificate_free_credentials.argtypes = [

678

certificate_credentials_t]

679

certificate_free_credentials.restype = None

680

681

handshake_set_private_extensions = (

682

_library.gnutls_handshake_set_private_extensions)

683

handshake_set_private_extensions.argtypes = [session_t,

684

ctypes.c_int]

685

handshake_set_private_extensions.restype = None

686

687

credentials_set = _library.gnutls_credentials_set

688

credentials_set.argtypes = [session_t, credentials_type_t,

689

ctypes.c_void_p]

690

credentials_set.restype = _error_code

691

692

strerror = _library.gnutls_strerror

693

strerror.argtypes = [ctypes.c_int]

694

strerror.restype = ctypes.c_char_p

695

696

certificate_type_get = _library.gnutls_certificate_type_get

697

certificate_type_get.argtypes = [session_t]

698

certificate_type_get.restype = _error_code

699

700

certificate_get_peers = _library.gnutls_certificate_get_peers

701

certificate_get_peers.argtypes = [session_t,

702

ctypes.POINTER(ctypes.c_uint)]

703

certificate_get_peers.restype = ctypes.POINTER(datum_t)

704

705

global_set_log_level = _library.gnutls_global_set_log_level

706

global_set_log_level.argtypes = [ctypes.c_int]

707

global_set_log_level.restype = None

708

709

global_set_log_function = _library.gnutls_global_set_log_function

710

global_set_log_function.argtypes = [log_func]

711

global_set_log_function.restype = None

712

713

deinit = _library.gnutls_deinit

714

deinit.argtypes = [session_t]

715

deinit.restype = None

716

717

handshake = _library.gnutls_handshake

718

handshake.argtypes = [session_t]

719

handshake.restype = _error_code

720

handshake.errcheck = _retry_on_error

721

722

transport_set_ptr = _library.gnutls_transport_set_ptr

723

transport_set_ptr.argtypes = [session_t, transport_ptr_t]

724

transport_set_ptr.restype = None

725

726

bye = _library.gnutls_bye

727

bye.argtypes = [session_t, close_request_t]

728

bye.restype = _error_code

729

bye.errcheck = _retry_on_error

730

731

check_version = _library.gnutls_check_version

732

check_version.argtypes = [ctypes.c_char_p]

733

check_version.restype = ctypes.c_char_p

734

735

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

736

737

openpgp_crt_init = _library.gnutls_openpgp_crt_init

738

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

739

openpgp_crt_init.restype = _error_code

740

741

openpgp_crt_import = _library.gnutls_openpgp_crt_import

742

openpgp_crt_import.argtypes = [openpgp_crt_t,

743

ctypes.POINTER(datum_t),

744

openpgp_crt_fmt_t]

745

openpgp_crt_import.restype = _error_code

746

747

openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self

748

openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,

749

ctypes.POINTER(ctypes.c_uint)]

750

openpgp_crt_verify_self.restype = _error_code

751

752

openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit

753

openpgp_crt_deinit.argtypes = [openpgp_crt_t]

754

openpgp_crt_deinit.restype = None

755

756

openpgp_crt_get_fingerprint = (

757

_library.gnutls_openpgp_crt_get_fingerprint)

758

openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,

759

ctypes.c_void_p,

760

ctypes.POINTER(

761

ctypes.c_size_t)]

762

openpgp_crt_get_fingerprint.restype = _error_code

763

764

# Remove non-public functions

765

del _error_code, _retry_on_error

766

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

767

gnutls = GnuTLS()

768

769

770

def call_pipe(connection, # : multiprocessing.Connection

771

func, *args, **kwargs):

428

772

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

429

430

This function runs a synchronous subprocess.call(), and writes the

431

resulting return code on the provided multiprocessing.Connection.

773

774

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

775

return value on the provided multiprocessing.Connection.

432

776

"""

433

connection.send(subprocess.call(*args, **kwargs))

777

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

434

778

connection.close()

435

779

780

436

781

class Client(object):

437

782

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

438

783

439

784

Attributes:

440

785

approved: bool(); 'None' if not yet approved/disapproved

441

786

approval_delay: datetime.timedelta(); Time to wait for approval

443

788

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

444

789

to see if the client lives.

445

790

'None' if no process is running.

446

checker_callback_tag: a gobject event source tag, or None

791

checker_callback_tag: a GLib event source tag, or None

447

792

checker_command: string; External command which is run to check

448

793

if client lives. %() expansions are done at

449

794

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

450

795

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

451

checker_initiator_tag: a gobject event source tag, or None

796

checker_initiator_tag: a GLib event source tag, or None

452

797

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

453

798

client_structure: Object describing what attributes a client has

454

799

and is used for storing the client at exit

455

800

current_checker_command: string; current running checker_command

456

disable_initiator_tag: a gobject event source tag, or None

801

disable_initiator_tag: a GLib event source tag, or None

457

802

enabled: bool()

458

803

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

459

804

uniquely identify the client

478

823

disabled, or None

479

824

server_settings: The server_settings dict from main()

480

825

"""

481

826

482

827

runtime_expansions = ("approval_delay", "approval_duration",

483

828

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

484

829

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

495

840

"approved_by_default": "True",

496

841

"enabled": "True",

497

842

}

498

843

499

844

@staticmethod

500

845

def config_parser(config):

501

846

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

508

853

for client_name in config.sections():

509

854

section = dict(config.items(client_name))

510

855

client = settings[client_name] = {}

511

856

512

857

client["host"] = section["host"]

513

858

# Reformat values from string types to Python types

514

859

client["approved_by_default"] = config.getboolean(

515

860

client_name, "approved_by_default")

516

861

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

517

862

"enabled")

518

863

519

864

# Uppercase and remove spaces from fingerprint for later

520

865

# comparison purposes with return value from the

521

866

# fingerprint() function

522

867

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

523

868

.replace(" ", ""))

524

869

if "secret" in section:

525

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

870

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

871

.encode("utf-8"),

872

"base64")

526

873

elif "secfile" in section:

527

874

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

528

875

(section["secfile"])),

543

890

client["last_approval_request"] = None

544

891

client["last_checked_ok"] = None

545

892

client["last_checker_status"] = -2

546

893

547

894

return settings

548

549

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

895

896

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

550

897

self.name = name

551

898

if server_settings is None:

552

899

server_settings = {}

554

901

# adding all client settings

555

902

for setting, value in settings.items():

556

903

setattr(self, setting, value)

557

904

558

905

if self.enabled:

559

906

if not hasattr(self, "last_enabled"):

560

907

self.last_enabled = datetime.datetime.utcnow()

564

911

else:

565

912

self.last_enabled = None

566

913

self.expires = None

567

914

568

915

logger.debug("Creating client %r", self.name)

569

916

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

570

917

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

571

918

datetime.datetime.utcnow())

572

919

573

920

# attributes specific for this server instance

574

921

self.checker = None

575

922

self.checker_initiator_tag = None

581

928

self.changedstate = multiprocessing_manager.Condition(

582

929

multiprocessing_manager.Lock())

583

930

self.client_structure = [attr

584

for attr in self.__dict__.iterkeys()

931

for attr in self.__dict__.keys()

585

932

if not attr.startswith("_")]

586

933

self.client_structure.append("client_structure")

587

934

588

935

for name, t in inspect.getmembers(

589

936

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

590

937

if not name.startswith("_"):

591

938

self.client_structure.append(name)

592

939

593

940

# Send notice to process children that client state has changed

594

941

def send_changedstate(self):

595

942

with self.changedstate:

596

943

self.changedstate.notify_all()

597

944

598

945

def enable(self):

599

946

"""Start this client's checker and timeout hooks"""

600

947

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

605

952

self.last_enabled = datetime.datetime.utcnow()

606

953

self.init_checker()

607

954

self.send_changedstate()

608

955

609

956

def disable(self, quiet=True):

610

957

"""Disable this client."""

611

958

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

613

960

if not quiet:

614

961

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

615

962

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

616

gobject.source_remove(self.disable_initiator_tag)

963

GLib.source_remove(self.disable_initiator_tag)

617

964

self.disable_initiator_tag = None

618

965

self.expires = None

619

966

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

620

gobject.source_remove(self.checker_initiator_tag)

967

GLib.source_remove(self.checker_initiator_tag)

621

968

self.checker_initiator_tag = None

622

969

self.stop_checker()

623

970

self.enabled = False

624

971

if not quiet:

625

972

self.send_changedstate()

626

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

973

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

627

974

return False

628

975

629

976

def __del__(self):

630

977

self.disable()

631

978

632

979

def init_checker(self):

633

980

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

634

981

# and every interval from then on.

635

982

if self.checker_initiator_tag is not None:

636

gobject.source_remove(self.checker_initiator_tag)

637

self.checker_initiator_tag = gobject.timeout_add(

983

GLib.source_remove(self.checker_initiator_tag)

984

self.checker_initiator_tag = GLib.timeout_add(

638

985

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

639

986

self.start_checker)

640

987

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

641

988

if self.disable_initiator_tag is not None:

642

gobject.source_remove(self.disable_initiator_tag)

643

self.disable_initiator_tag = gobject.timeout_add(

989

GLib.source_remove(self.disable_initiator_tag)

990

self.disable_initiator_tag = GLib.timeout_add(

644

991

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

645

992

# Also start a new checker *right now*.

646

993

self.start_checker()

647

648

def checker_callback(self, source, condition,

649

(connection, command)):

994

995

def checker_callback(self, source, condition, connection,

996

command):

650

997

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

651

998

self.checker_callback_tag = None

652

999

self.checker = None

653

# Read return code from connection (see subprocess_call_pipe)

1000

# Read return code from connection (see call_pipe)

654

1001

returncode = connection.recv()

655

1002

connection.close()

656

1003

657

1004

if returncode >= 0:

658

1005

self.last_checker_status = returncode

659

1006

self.last_checker_signal = None

669

1016

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

670

1017

vars(self))

671

1018

return False

672

1019

673

1020

def checked_ok(self):

674

1021

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

675

1022

self.last_checked_ok = datetime.datetime.utcnow()

676

1023

self.last_checker_status = 0

677

1024

self.last_checker_signal = None

678

1025

self.bump_timeout()

679

1026

680

1027

def bump_timeout(self, timeout=None):

681

1028

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

682

1029

if timeout is None:

683

1030

timeout = self.timeout

684

1031

if self.disable_initiator_tag is not None:

685

gobject.source_remove(self.disable_initiator_tag)

1032

GLib.source_remove(self.disable_initiator_tag)

686

1033

self.disable_initiator_tag = None

687

1034

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

688

self.disable_initiator_tag = gobject.timeout_add(

1035

self.disable_initiator_tag = GLib.timeout_add(

689

1036

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

690

1037

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

691

1038

692

1039

def need_approval(self):

693

1040

self.last_approval_request = datetime.datetime.utcnow()

694

1041

695

1042

def start_checker(self):

696

1043

"""Start a new checker subprocess if one is not running.

697

1044

698

1045

If a checker already exists, leave it running and do

699

1046

nothing."""

700

1047

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

705

1052

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

706

1053

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

707

1054

# should be.

708

1055

709

1056

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

710

1057

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

711

1058

self.checker.join()

715

1062

# Escape attributes for the shell

716

1063

escaped_attrs = {

717

1064

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

718

for attr in self.runtime_expansions }

1065

for attr in self.runtime_expansions}

719

1066

try:

720

1067

command = self.checker_command % escaped_attrs

721

1068

except TypeError as error:

733

1080

# The exception is when not debugging but nevertheless

734

1081

# running in the foreground; use the previously

735

1082

# created wnull.

736

popen_args = { "close_fds": True,

737

"shell": True,

738

"cwd": "/" }

1083

popen_args = {"close_fds": True,

1084

"shell": True,

1085

"cwd": "/"}

739

1086

if (not self.server_settings["debug"]

740

1087

and self.server_settings["foreground"]):

741

1088

popen_args.update({"stdout": wnull,

742

"stderr": wnull })

1089

"stderr": wnull})

743

1090

pipe = multiprocessing.Pipe(duplex=False)

744

1091

self.checker = multiprocessing.Process(

745

target=subprocess_call_pipe, args=(pipe[1], command),

1092

target=call_pipe,

1093

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

746

1094

kwargs=popen_args)

747

1095

self.checker.start()

748

self.checker_callback_tag = gobject.io_add_watch(

749

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

750

self.checker_callback, (pipe[0], command))

751

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

1096

self.checker_callback_tag = GLib.io_add_watch(

1097

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

1098

self.checker_callback, pipe[0], command)

1099

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

752

1100

return True

753

1101

754

1102

def stop_checker(self):

755

1103

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

756

1104

if self.checker_callback_tag:

757

gobject.source_remove(self.checker_callback_tag)

1105

GLib.source_remove(self.checker_callback_tag)

758

1106

self.checker_callback_tag = None

759

1107

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

760

1108

return

769

1117

byte_arrays=False):

770

1118

"""Decorators for marking methods of a DBusObjectWithProperties to

771

1119

become properties on the D-Bus.

772

1120

773

1121

The decorated method will be called with no arguments by "Get"

774

1122

and with one argument by "Set".

775

1123

776

1124

The parameters, where they are supported, are the same as

777

1125

dbus.service.method, except there is only "signature", since the

778

1126

type from Get() and the type sent to Set() is the same.

782

1130

if byte_arrays and signature != "ay":

783

1131

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

784

1132

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

785

1133

786

1134

def decorator(func):

787

1135

func._dbus_is_property = True

788

1136

func._dbus_interface = dbus_interface

791

1139

func._dbus_name = func.__name__

792

1140

if func._dbus_name.endswith("_dbus_property"):

793

1141

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

794

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

1142

func._dbus_get_args_options = {'byte_arrays': byte_arrays}

795

1143

return func

796

1144

797

1145

return decorator

798

1146

799

1147

800

1148

def dbus_interface_annotations(dbus_interface):

801

1149

"""Decorator for marking functions returning interface annotations

802

1150

803

1151

Usage:

804

1152

805

1153

@dbus_interface_annotations("org.example.Interface")

806

1154

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

807

1155

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

808

1156

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

809

1157

"false"}

810

1158

"""

811

1159

812

1160

def decorator(func):

813

1161

func._dbus_is_interface = True

814

1162

func._dbus_interface = dbus_interface

815

1163

func._dbus_name = dbus_interface

816

1164

return func

817

1165

818

1166

return decorator

819

1167

820

1168

821

1169

def dbus_annotations(annotations):

822

1170

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

823

1171

Usage:

824

1172

825

1173

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

826

1174

"org.freedesktop.DBus.Property."

827

1175

"EmitsChangedSignal": "false"})

829

1177

access="r")

830

1178

def Property_dbus_property(self):

831

1179

return dbus.Boolean(False)

1180

1181

See also the DBusObjectWithAnnotations class.

832

1182

"""

833

1183

834

1184

def decorator(func):

835

1185

func._dbus_annotations = annotations

836

1186

return func

837

1187

838

1188

return decorator

839

1189

840

1190

856

1206

pass

857

1207

858

1208

859

class DBusObjectWithProperties(dbus.service.Object):

860

"""A D-Bus object with properties.

861

862

Classes inheriting from this can use the dbus_service_property

863

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

864

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

1209

class DBusObjectWithAnnotations(dbus.service.Object):

1210

"""A D-Bus object with annotations.

1211

1212

Classes inheriting from this can use the dbus_annotations

1213

decorator to add annotations to methods or signals.

865

1214

"""

866

1215

867

1216

@staticmethod

868

1217

def _is_dbus_thing(thing):

869

1218

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

870

1219

871

1220

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

872

1221

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

873

1222

"""

874

1223

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

875

1224

False)

876

1225

877

1226

def _get_all_dbus_things(self, thing):

878

1227

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

879

1228

"""

882

1231

for cls in self.__class__.__mro__

883

1232

for name, athing in

884

1233

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

885

1234

1235

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1236

out_signature="s",

1237

path_keyword='object_path',

1238

connection_keyword='connection')

1239

def Introspect(self, object_path, connection):

1240

"""Overloading of standard D-Bus method.

1241

1242

Inserts annotation tags on methods and signals.

1243

"""

1244

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

1245

connection)

1246

try:

1247

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

1248

1249

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

1250

# Add annotation tags

1251

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

1252

for tag in if_tag.getElementsByTagName(typ):

1253

annots = dict()

1254

for name, prop in (self.

1255

_get_all_dbus_things(typ)):

1256

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

1257

and prop._dbus_interface

1258

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

1259

annots.update(getattr(

1260

prop, "_dbus_annotations", {}))

1261

for name, value in annots.items():

1262

ann_tag = document.createElement(

1263

"annotation")

1264

ann_tag.setAttribute("name", name)

1265

ann_tag.setAttribute("value", value)

1266

tag.appendChild(ann_tag)

1267

# Add interface annotation tags

1268

for annotation, value in dict(

1269

itertools.chain.from_iterable(

1270

annotations().items()

1271

for name, annotations

1272

in self._get_all_dbus_things("interface")

1273

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

1274

)).items():

1275

ann_tag = document.createElement("annotation")

1276

ann_tag.setAttribute("name", annotation)

1277

ann_tag.setAttribute("value", value)

1278

if_tag.appendChild(ann_tag)

1279

# Fix argument name for the Introspect method itself

1280

if (if_tag.getAttribute("name")

1281

== dbus.INTROSPECTABLE_IFACE):

1282

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

1283

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

1284

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

1285

if (arg.getAttribute("direction")

1286

== "out"):

1287

arg.setAttribute("name",

1288

"xml_data")

1289

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

1290

document.unlink()

1291

except (AttributeError, xml.dom.DOMException,

1292

xml.parsers.expat.ExpatError) as error:

1293

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

1294

exc_info=error)

1295

return xmlstring

1296

1297

1298

class DBusObjectWithProperties(DBusObjectWithAnnotations):

1299

"""A D-Bus object with properties.

1300

1301

Classes inheriting from this can use the dbus_service_property

1302

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

1303

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

1304

"""

1305

886

1306

def _get_dbus_property(self, interface_name, property_name):

887

1307

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

888

1308

property with the specified name and interface.

893

1313

if (value._dbus_name == property_name

894

1314

and value._dbus_interface == interface_name):

895

1315

return value.__get__(self)

896

1316

897

1317

# No such property

898

1318

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

899

1319

self.dbus_object_path, interface_name, property_name))

900

1320

1321

@classmethod

1322

def _get_all_interface_names(cls):

1323

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

1324

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

1325

"_dbus_interface", None)

1326

for x in (inspect.getmro(cls))

1327

for attr in dir(x))

1328

if name is not None)

1329

901

1330

@dbus.service.method(dbus.PROPERTIES_IFACE,

902

1331

in_signature="ss",

903

1332

out_signature="v")

911

1340

if not hasattr(value, "variant_level"):

912

1341

return value

913

1342

return type(value)(value, variant_level=value.variant_level+1)

914

1343

915

1344

@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")

916

1345

def Set(self, interface_name, property_name, value):

917

1346

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

929

1358

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

930

1359

for byte in value))

931

1360

prop(value)

932

1361

933

1362

@dbus.service.method(dbus.PROPERTIES_IFACE,

934

1363

in_signature="s",

935

1364

out_signature="a{sv}")

936

1365

def GetAll(self, interface_name):

937

1366

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

938

1367

standard.

939

1368

940

1369

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

941

1370

"""

942

1371

properties = {}

953

1382

properties[name] = value

954

1383

continue

955

1384

properties[name] = type(value)(

956

value, variant_level = value.variant_level + 1)

1385

value, variant_level=value.variant_level + 1)

957

1386

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

958

1387

959

1388

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

960

1389

def PropertiesChanged(self, interface_name, changed_properties,

961

1390

invalidated_properties):

963

1392

standard.

964

1393

"""

965

1394

pass

966

1395

967

1396

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

968

1397

out_signature="s",

969

1398

path_keyword='object_path',

970

1399

connection_keyword='connection')

971

1400

def Introspect(self, object_path, connection):

972

1401

"""Overloading of standard D-Bus method.

973

1402

974

1403

Inserts property tags and interface annotation tags.

975

1404

"""

976

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

977

connection)

1405

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1406

object_path,

1407

connection)

978

1408

try:

979

1409

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

980

1410

981

1411

def make_tag(document, name, prop):

982

1412

e = document.createElement("property")

983

1413

e.setAttribute("name", name)

984

1414

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

985

1415

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

986

1416

return e

987

1417

988

1418

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

989

1419

# Add property tags

990

1420

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

993

1423

if prop._dbus_interface

994

1424

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

995

1425

if_tag.appendChild(tag)

996

# Add annotation tags

997

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

998

for tag in if_tag.getElementsByTagName(typ):

999

annots = dict()

1000

for name, prop in (self.

1001

_get_all_dbus_things(typ)):

1002

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

1003

and prop._dbus_interface

1004

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

1005

annots.update(getattr(

1006

prop, "_dbus_annotations", {}))

1007

for name, value in annots.items():

1008

ann_tag = document.createElement(

1009

"annotation")

1010

ann_tag.setAttribute("name", name)

1011

ann_tag.setAttribute("value", value)

1012

tag.appendChild(ann_tag)

1013

# Add interface annotation tags

1014

for annotation, value in dict(

1015

itertools.chain.from_iterable(

1016

annotations().items()

1017

for name, annotations

1018

in self._get_all_dbus_things("interface")

1019

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

1020

)).items():

1021

ann_tag = document.createElement("annotation")

1022

ann_tag.setAttribute("name", annotation)

1023

ann_tag.setAttribute("value", value)

1024

if_tag.appendChild(ann_tag)

1426

# Add annotation tags for properties

1427

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

1428

annots = dict()

1429

for name, prop in self._get_all_dbus_things(

1430

"property"):

1431

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

1432

and prop._dbus_interface

1433

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

1434

annots.update(getattr(

1435

prop, "_dbus_annotations", {}))

1436

for name, value in annots.items():

1437

ann_tag = document.createElement(

1438

"annotation")

1439

ann_tag.setAttribute("name", name)

1440

ann_tag.setAttribute("value", value)

1441

tag.appendChild(ann_tag)

1025

1442

# Add the names to the return values for the

1026

1443

# "org.freedesktop.DBus.Properties" methods

1027

1444

if (if_tag.getAttribute("name")

1046

1463

return xmlstring

1047

1464

1048

1465

1466

try:

1467

dbus.OBJECT_MANAGER_IFACE

1468

except AttributeError:

1469

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

1470

1471

1472

class DBusObjectWithObjectManager(DBusObjectWithAnnotations):

1473

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

1474

1475

Classes inheriting from this exposes the standard

1476

GetManagedObjects call and the InterfacesAdded and

1477

InterfacesRemoved signals on the standard

1478

"org.freedesktop.DBus.ObjectManager" interface.

1479

1480

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

1481

manually.

1482

"""

1483

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

1484

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

1485

def GetManagedObjects(self):

1486

"""This function must be overridden"""

1487

raise NotImplementedError()

1488

1489

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,

1490

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

1491

def InterfacesAdded(self, object_path, interfaces_and_properties):

1492

pass

1493

1494

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

1495

def InterfacesRemoved(self, object_path, interfaces):

1496

pass

1497

1498

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1499

out_signature="s",

1500

path_keyword='object_path',

1501

connection_keyword='connection')

1502

def Introspect(self, object_path, connection):

1503

"""Overloading of standard D-Bus method.

1504

1505

Override return argument name of GetManagedObjects to be

1506

"objpath_interfaces_and_properties"

1507

"""

1508

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1509

object_path,

1510

connection)

1511

try:

1512

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

1513

1514

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

1515

# Fix argument name for the GetManagedObjects method

1516

if (if_tag.getAttribute("name")

1517

== dbus.OBJECT_MANAGER_IFACE):

1518

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

1519

if (cn.getAttribute("name")

1520

== "GetManagedObjects"):

1521

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

1522

if (arg.getAttribute("direction")

1523

== "out"):

1524

arg.setAttribute(

1525

"name",

1526

"objpath_interfaces"

1527

"_and_properties")

1528

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

1529

document.unlink()

1530

except (AttributeError, xml.dom.DOMException,

1531

xml.parsers.expat.ExpatError) as error:

1532

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

1533

exc_info=error)

1534

return xmlstring

1535

1536

1049

1537

def datetime_to_dbus(dt, variant_level=0):

1050

1538

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

1051

1539

if dt is None:

1052

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

1540

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

1053

1541

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

1054

1542

1055

1543

1058

1546

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

1059

1547

interface names according to the "alt_interface_names" mapping.

1060

1548

Usage:

1061

1549

1062

1550

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

1063

1551

"net.example.AlternateInterface"})

1064

1552

class SampleDBusObject(dbus.service.Object):

1065

1553

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

1066

1554

def SampleDBusMethod():

1067

1555

pass

1068

1556

1069

1557

The above "SampleDBusMethod" on "SampleDBusObject" will be

1070

1558

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

1071

1559

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

1072

1560

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

1073

1561

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

1074

1562

1075

1563

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

1076

1564

(from DBusObjectWithProperties) and interfaces (from the

1077

1565

dbus_interface_annotations decorator).

1078

1566

"""

1079

1567

1080

1568

def wrapper(cls):

1081

1569

for orig_interface_name, alt_interface_name in (

1082

1570

alt_interface_names.items()):

1099

1587

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

1100

1588

# Extract the original non-method undecorated

1101

1589

# function by black magic

1102

nonmethod_func = (dict(

1103

zip(attribute.func_code.co_freevars,

1104

attribute.__closure__))

1105

["func"].cell_contents)

1590

if sys.version_info.major == 2:

1591

nonmethod_func = (dict(

1592

zip(attribute.func_code.co_freevars,

1593

attribute.__closure__))

1594

["func"].cell_contents)

1595

else:

1596

nonmethod_func = (dict(

1597

zip(attribute.__code__.co_freevars,

1598

attribute.__closure__))

1599

["func"].cell_contents)

1106

1600

# Create a new, but exactly alike, function

1107

1601

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

1108

1602

# with the alternate D-Bus interface name

1603

new_function = copy_function(nonmethod_func)

1109

1604

new_function = (dbus.service.signal(

1110

alt_interface, attribute._dbus_signature)

1111

(types.FunctionType(

1112

nonmethod_func.func_code,

1113

nonmethod_func.func_globals,

1114

nonmethod_func.func_name,

1115

nonmethod_func.func_defaults,

1116

nonmethod_func.func_closure)))

1605

alt_interface,

1606

attribute._dbus_signature)(new_function))

1117

1607

# Copy annotations, if any

1118

1608

try:

1119

1609

new_function._dbus_annotations = dict(

1120

1610

attribute._dbus_annotations)

1121

1611

except AttributeError:

1122

1612

pass

1613

1123

1614

# Define a creator of a function to call both the

1124

1615

# original and alternate functions, so both the

1125

1616

# original and alternate signals gets sent when

1128

1619

"""This function is a scope container to pass

1129

1620

func1 and func2 to the "call_both" function

1130

1621

outside of its arguments"""

1131

1622

1623

@functools.wraps(func2)

1132

1624

def call_both(*args, **kwargs):

1133

1625

"""This function will emit two D-Bus

1134

1626

signals by calling func1 and func2"""

1135

1627

func1(*args, **kwargs)

1136

1628

func2(*args, **kwargs)

1137

1629

# Make wrapper function look like a D-Bus

1630

# signal

1631

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

1632

if name.startswith("_dbus_"):

1633

setattr(call_both, name, attr)

1634

1138

1635

return call_both

1139

1636

# Create the "call_both" function and add it to

1140

1637

# the class

1150

1647

alt_interface,

1151

1648

attribute._dbus_in_signature,

1152

1649

attribute._dbus_out_signature)

1153

(types.FunctionType(attribute.func_code,

1154

attribute.func_globals,

1155

attribute.func_name,

1156

attribute.func_defaults,

1157

attribute.func_closure)))

1650

(copy_function(attribute)))

1158

1651

# Copy annotations, if any

1159

1652

try:

1160

1653

attr[attrname]._dbus_annotations = dict(

1172

1665

attribute._dbus_access,

1173

1666

attribute._dbus_get_args_options

1174

1667

["byte_arrays"])

1175

(types.FunctionType(

1176

attribute.func_code,

1177

attribute.func_globals,

1178

attribute.func_name,

1179

attribute.func_defaults,

1180

attribute.func_closure)))

1668

(copy_function(attribute)))

1181

1669

# Copy annotations, if any

1182

1670

try:

1183

1671

attr[attrname]._dbus_annotations = dict(

1192

1680

# to the class.

1193

1681

attr[attrname] = (

1194

1682

dbus_interface_annotations(alt_interface)

1195

(types.FunctionType(attribute.func_code,

1196

attribute.func_globals,

1197

attribute.func_name,

1198

attribute.func_defaults,

1199

attribute.func_closure)))

1683

(copy_function(attribute)))

1200

1684

if deprecate:

1201

1685

# Deprecate all alternate interfaces

1202

iname="_AlternateDBusNames_interface_annotation{}"

1686

iname = "_AlternateDBusNames_interface_annotation{}"

1203

1687

for interface_name in interface_names:

1204

1688

1205

1689

@dbus_interface_annotations(interface_name)

1206

1690

def func(self):

1207

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

1208

"true" }

1691

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

1692

"true"}

1209

1693

# Find an unused name

1210

1694

for aname in (iname.format(i)

1211

1695

for i in itertools.count()):

1215

1699

if interface_names:

1216

1700

# Replace the class with a new subclass of it with

1217

1701

# methods, signals, etc. as created above.

1218

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

1219

(cls, ), attr)

1702

if sys.version_info.major == 2:

1703

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

1704

(cls, ), attr)

1705

else:

1706

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

1707

(cls, ), attr)

1220

1708

return cls

1221

1709

1222

1710

return wrapper

1223

1711

1224

1712

1226

1714

"se.bsnet.fukt.Mandos"})

1227

1715

class ClientDBus(Client, DBusObjectWithProperties):

1228

1716

"""A Client class using D-Bus

1229

1717

1230

1718

Attributes:

1231

1719

dbus_object_path: dbus.ObjectPath

1232

1720

bus: dbus.SystemBus()

1233

1721

"""

1234

1722

1235

1723

runtime_expansions = (Client.runtime_expansions

1236

1724

+ ("dbus_object_path", ))

1237

1725

1238

1726

_interface = "se.recompile.Mandos.Client"

1239

1727

1240

1728

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

1241

1242

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

1729

1730

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

1243

1731

self.bus = bus

1244

1732

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

1245

1733

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

1251

1739

"/clients/" + client_object_name)

1252

1740

DBusObjectWithProperties.__init__(self, self.bus,

1253

1741

self.dbus_object_path)

1254

1742

1255

1743

def notifychangeproperty(transform_func, dbus_name,

1256

1744

type_func=lambda x: x,

1257

1745

variant_level=1,

1259

1747

_interface=_interface):

1260

1748

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

1261

1749

its changes to DBus.

1262

1750

1263

1751

transform_fun: Function that takes a value and a variant_level

1264

1752

and transforms it to a D-Bus type.

1265

1753

dbus_name: D-Bus name of the variable

1268

1756

variant_level: D-Bus variant level. Default: 1

1269

1757

"""

1270

1758

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

1271

1759

1272

1760

def setter(self, value):

1273

1761

if hasattr(self, "dbus_object_path"):

1274

1762

if (not hasattr(self, attrname) or

1281

1769

else:

1282

1770

dbus_value = transform_func(

1283

1771

type_func(value),

1284

variant_level = variant_level)

1772

variant_level=variant_level)

1285

1773

self.PropertyChanged(dbus.String(dbus_name),

1286

1774

dbus_value)

1287

1775

self.PropertiesChanged(

1288

1776

_interface,

1289

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

1290

dbus_value }),

1777

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

1778

dbus_value}),

1291

1779

dbus.Array())

1292

1780

setattr(self, attrname, value)

1293

1781

1294

1782

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

1295

1783

1296

1784

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1297

1785

approvals_pending = notifychangeproperty(dbus.Boolean,

1298

1786

"ApprovalPending",

1299

type_func = bool)

1787

type_func=bool)

1300

1788

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

1301

1789

last_enabled = notifychangeproperty(datetime_to_dbus,

1302

1790

"LastEnabled")

1303

1791

checker = notifychangeproperty(

1304

1792

dbus.Boolean, "CheckerRunning",

1305

type_func = lambda checker: checker is not None)

1793

type_func=lambda checker: checker is not None)

1306

1794

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1307

1795

"LastCheckedOK")

1308

1796

last_checker_status = notifychangeproperty(dbus.Int16,

1313

1801

"ApprovedByDefault")

1314

1802

approval_delay = notifychangeproperty(

1315

1803

dbus.UInt64, "ApprovalDelay",

1316

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

1804

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

1317

1805

approval_duration = notifychangeproperty(

1318

1806

dbus.UInt64, "ApprovalDuration",

1319

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

1807

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

1320

1808

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

1321

1809

timeout = notifychangeproperty(

1322

1810

dbus.UInt64, "Timeout",

1323

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

1811

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

1324

1812

extended_timeout = notifychangeproperty(

1325

1813

dbus.UInt64, "ExtendedTimeout",

1326

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

1814

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

1327

1815

interval = notifychangeproperty(

1328

1816

dbus.UInt64, "Interval",

1329

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

1817

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

1330

1818

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

1331

1819

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

1332

1820

invalidate_only=True)

1333

1821

1334

1822

del notifychangeproperty

1335

1823

1336

1824

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

1337

1825

try:

1338

1826

self.remove_from_connection()

1341

1829

if hasattr(DBusObjectWithProperties, "__del__"):

1342

1830

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

1343

1831

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

1344

1832

1345

1833

def checker_callback(self, source, condition,

1346

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

1834

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

1347

1835

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

1348

(connection, command), *args,

1836

connection, command, *args,

1349

1837

**kwargs)

1350

1838

exitstatus = self.last_checker_status

1351

1839

if exitstatus >= 0:

1352

1840

# Emit D-Bus signal

1353

1841

self.CheckerCompleted(dbus.Int16(exitstatus),

1354

dbus.Int64(0),

1842

# This is specific to GNU libC

1843

dbus.Int64(exitstatus << 8),

1355

1844

dbus.String(command))

1356

1845

else:

1357

1846

# Emit D-Bus signal

1358

1847

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

1359

1848

dbus.Int64(

1360

self.last_checker_signal),

1849

# This is specific to GNU libC

1850

(exitstatus << 8)

1851

| self.last_checker_signal),

1361

1852

dbus.String(command))

1362

1853

return ret

1363

1854

1364

1855

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

1365

1856

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

1366

1857

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

1370

1861

# Emit D-Bus signal

1371

1862

self.CheckerStarted(self.current_checker_command)

1372

1863

return r

1373

1864

1374

1865

def _reset_approved(self):

1375

1866

self.approved = None

1376

1867

return False

1377

1868

1378

1869

def approve(self, value=True):

1379

1870

self.approved = value

1380

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

1381

* 1000), self._reset_approved)

1871

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

1872

* 1000), self._reset_approved)

1382

1873

self.send_changedstate()

1383

1384

## D-Bus methods, signals & properties

1385

1386

## Interfaces

1387

1388

## Signals

1389

1874

1875

# D-Bus methods, signals & properties

1876

1877

# Interfaces

1878

1879

# Signals

1880

1390

1881

# CheckerCompleted - signal

1391

1882

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

1392

1883

def CheckerCompleted(self, exitcode, waitstatus, command):

1393

1884

"D-Bus signal"

1394

1885

pass

1395

1886

1396

1887

# CheckerStarted - signal

1397

1888

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

1398

1889

def CheckerStarted(self, command):

1399

1890

"D-Bus signal"

1400

1891

pass

1401

1892

1402

1893

# PropertyChanged - signal

1403

1894

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

1404

1895

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

1405

1896

def PropertyChanged(self, property, value):

1406

1897

"D-Bus signal"

1407

1898

pass

1408

1899

1409

1900

# GotSecret - signal

1410

1901

@dbus.service.signal(_interface)

1411

1902

def GotSecret(self):

1414

1905

server to mandos-client

1415

1906

"""

1416

1907

pass

1417

1908

1418

1909

# Rejected - signal

1419

1910

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

1420

1911

def Rejected(self, reason):

1421

1912

"D-Bus signal"

1422

1913

pass

1423

1914

1424

1915

# NeedApproval - signal

1425

1916

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

1426

1917

def NeedApproval(self, timeout, default):

1427

1918

"D-Bus signal"

1428

1919

return self.need_approval()

1429

1430

## Methods

1431

1920

1921

# Methods

1922

1432

1923

# Approve - method

1433

1924

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

1434

1925

def Approve(self, value):

1435

1926

self.approve(value)

1436

1927

1437

1928

# CheckedOK - method

1438

1929

@dbus.service.method(_interface)

1439

1930

def CheckedOK(self):

1440

1931

self.checked_ok()

1441

1932

1442

1933

# Enable - method

1934

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

1443

1935

@dbus.service.method(_interface)

1444

1936

def Enable(self):

1445

1937

"D-Bus method"

1446

1938

self.enable()

1447

1939

1448

1940

# StartChecker - method

1941

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

1449

1942

@dbus.service.method(_interface)

1450

1943

def StartChecker(self):

1451

1944

"D-Bus method"

1452

1945

self.start_checker()

1453

1946

1454

1947

# Disable - method

1948

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

1455

1949

@dbus.service.method(_interface)

1456

1950

def Disable(self):

1457

1951

"D-Bus method"

1458

1952

self.disable()

1459

1953

1460

1954

# StopChecker - method

1955

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

1461

1956

@dbus.service.method(_interface)

1462

1957

def StopChecker(self):

1463

1958

self.stop_checker()

1464

1465

## Properties

1466

1959

1960

# Properties

1961

1467

1962

# ApprovalPending - property

1468

1963

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

1469

1964

def ApprovalPending_dbus_property(self):

1470

1965

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

1471

1966

1472

1967

# ApprovedByDefault - property

1473

1968

@dbus_service_property(_interface,

1474

1969

signature="b",

1477

1972

if value is None: # get

1478

1973

return dbus.Boolean(self.approved_by_default)

1479

1974

self.approved_by_default = bool(value)

1480

1975

1481

1976

# ApprovalDelay - property

1482

1977

@dbus_service_property(_interface,

1483

1978

signature="t",

1487

1982

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

1488

1983

* 1000)

1489

1984

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

1490

1985

1491

1986

# ApprovalDuration - property

1492

1987

@dbus_service_property(_interface,

1493

1988

signature="t",

1497

1992

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

1498

1993

* 1000)

1499

1994

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

1500

1995

1501

1996

# Name - property

1997

@dbus_annotations(

1998

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

1502

1999

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

1503

2000

def Name_dbus_property(self):

1504

2001

return dbus.String(self.name)

1505

2002

1506

2003

# Fingerprint - property

2004

@dbus_annotations(

2005

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

1507

2006

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

1508

2007

def Fingerprint_dbus_property(self):

1509

2008

return dbus.String(self.fingerprint)

1510

2009

1511

2010

# Host - property

1512

2011

@dbus_service_property(_interface,

1513

2012

signature="s",

1516

2015

if value is None: # get

1517

2016

return dbus.String(self.host)

1518

2017

self.host = str(value)

1519

2018

1520

2019

# Created - property

2020

@dbus_annotations(

2021

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

1521

2022

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

1522

2023

def Created_dbus_property(self):

1523

2024

return datetime_to_dbus(self.created)

1524

2025

1525

2026

# LastEnabled - property

1526

2027

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

1527

2028

def LastEnabled_dbus_property(self):

1528

2029

return datetime_to_dbus(self.last_enabled)

1529

2030

1530

2031

# Enabled - property

1531

2032

@dbus_service_property(_interface,

1532

2033

signature="b",

1538

2039

self.enable()

1539

2040

else:

1540

2041

self.disable()

1541

2042

1542

2043

# LastCheckedOK - property

1543

2044

@dbus_service_property(_interface,

1544

2045

signature="s",

1548

2049

self.checked_ok()

1549

2050

return

1550

2051

return datetime_to_dbus(self.last_checked_ok)

1551

2052

1552

2053

# LastCheckerStatus - property

1553

2054

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

1554

2055

def LastCheckerStatus_dbus_property(self):

1555

2056

return dbus.Int16(self.last_checker_status)

1556

2057

1557

2058

# Expires - property

1558

2059

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

1559

2060

def Expires_dbus_property(self):

1560

2061

return datetime_to_dbus(self.expires)

1561

2062

1562

2063

# LastApprovalRequest - property

1563

2064

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

1564

2065

def LastApprovalRequest_dbus_property(self):

1565

2066

return datetime_to_dbus(self.last_approval_request)

1566

2067

1567

2068

# Timeout - property

1568

2069

@dbus_service_property(_interface,

1569

2070

signature="t",

1584

2085

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

1585

2086

is None):

1586

2087

return

1587

gobject.source_remove(self.disable_initiator_tag)

1588

self.disable_initiator_tag = gobject.timeout_add(

2088

GLib.source_remove(self.disable_initiator_tag)

2089

self.disable_initiator_tag = GLib.timeout_add(

1589

2090

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

1590

2091

self.disable)

1591

2092

1592

2093

# ExtendedTimeout - property

1593

2094

@dbus_service_property(_interface,

1594

2095

signature="t",

1598

2099

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

1599

2100

* 1000)

1600

2101

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

1601

2102

1602

2103

# Interval - property

1603

2104

@dbus_service_property(_interface,

1604

2105

signature="t",

1611

2112

return

1612

2113

if self.enabled:

1613

2114

# Reschedule checker run

1614

gobject.source_remove(self.checker_initiator_tag)

1615

self.checker_initiator_tag = gobject.timeout_add(

2115

GLib.source_remove(self.checker_initiator_tag)

2116

self.checker_initiator_tag = GLib.timeout_add(

1616

2117

value, self.start_checker)

1617

self.start_checker() # Start one now, too

1618

2118

self.start_checker() # Start one now, too

2119

1619

2120

# Checker - property

1620

2121

@dbus_service_property(_interface,

1621

2122

signature="s",

1624

2125

if value is None: # get

1625

2126

return dbus.String(self.checker_command)

1626

2127

self.checker_command = str(value)

1627

2128

1628

2129

# CheckerRunning - property

1629

2130

@dbus_service_property(_interface,

1630

2131

signature="b",

1636

2137

self.start_checker()

1637

2138

else:

1638

2139

self.stop_checker()

1639

2140

1640

2141

# ObjectPath - property

2142

@dbus_annotations(

2143

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

2144

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

1641

2145

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

1642

2146

def ObjectPath_dbus_property(self):

1643

return self.dbus_object_path # is already a dbus.ObjectPath

1644

2147

return self.dbus_object_path # is already a dbus.ObjectPath

2148

1645

2149

# Secret = property

2150

@dbus_annotations(

2151

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

2152

"invalidates"})

1646

2153

@dbus_service_property(_interface,

1647

2154

signature="ay",

1648

2155

access="write",

1649

2156

byte_arrays=True)

1650

2157

def Secret_dbus_property(self, value):

1651

2158

self.secret = bytes(value)

1652

2159

1653

2160

del _interface

1654

2161

1655

2162

1658

2165

self._pipe = child_pipe

1659

2166

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

1660

2167

if not self._pipe.recv():

1661

raise KeyError()

1662

2168

raise KeyError(fpr)

2169

1663

2170

def __getattribute__(self, name):

1664

2171

if name == '_pipe':

1665

2172

return super(ProxyClient, self).__getattribute__(name)

1668

2175

if data[0] == 'data':

1669

2176

return data[1]

1670

2177

if data[0] == 'function':

1671

2178

1672

2179

def func(*args, **kwargs):

1673

2180

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

1674

2181

return self._pipe.recv()[1]

1675

2182

1676

2183

return func

1677

2184

1678

2185

def __setattr__(self, name, value):

1679

2186

if name == '_pipe':

1680

2187

return super(ProxyClient, self).__setattr__(name, value)

1683

2190

1684

2191

class ClientHandler(socketserver.BaseRequestHandler, object):

1685

2192

"""A class to handle client connections.

1686

2193

1687

2194

Instantiated once for each connection to handle it.

1688

2195

Note: This will run in its own forked process."""

1689

2196

1690

2197

def handle(self):

1691

2198

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

1692

2199

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

1693

2200

str(self.client_address))

1694

2201

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

1695

2202

self.server.child_pipe.fileno())

1696

1697

session = gnutls.connection.ClientSession(

1698

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

1699

1700

# Note: gnutls.connection.X509Credentials is really a

1701

# generic GnuTLS certificate credentials object so long as

1702

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

1703

# here despite using OpenPGP certificates.

1704

1705

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

1706

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

1707

# "+COMP-NULL", "+CTYPE-OPENPGP",

1708

# "+DHE-DSS"))

2203

2204

session = gnutls.ClientSession(self.request)

2205

2206

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

2207

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

2208

# "+COMP-NULL", "+CTYPE-OPENPGP",

2209

# "+DHE-DSS"))

1709

2210

# Use a fallback default, since this MUST be set.

1710

2211

priority = self.server.gnutls_priority

1711

2212

if priority is None:

1712

2213

priority = "NORMAL"

1713

gnutls.library.functions.gnutls_priority_set_direct(

1714

session._c_object, priority, None)

1715

2214

gnutls.priority_set_direct(session._c_object,

2215

priority.encode("utf-8"),

2216

None)

2217

1716

2218

# Start communication using the Mandos protocol

1717

2219

# Get protocol number

1718

2220

line = self.request.makefile().readline()

1723

2225

except (ValueError, IndexError, RuntimeError) as error:

1724

2226

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

1725

2227

return

1726

2228

1727

2229

# Start GnuTLS connection

1728

2230

try:

1729

2231

session.handshake()

1730

except gnutls.errors.GNUTLSError as error:

2232

except gnutls.Error as error:

1731

2233

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

1732

2234

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

1733

2235

# established. Just abandon the request.

1734

2236

return

1735

2237

logger.debug("Handshake succeeded")

1736

2238

1737

2239

approval_required = False

1738

2240

try:

1739

2241

try:

1740

2242

fpr = self.fingerprint(

1741

2243

self.peer_certificate(session))

1742

except (TypeError,

1743

gnutls.errors.GNUTLSError) as error:

2244

except (TypeError, gnutls.Error) as error:

1744

2245

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

1745

2246

return

1746

2247

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

1747

2248

1748

2249

try:

1749

2250

client = ProxyClient(child_pipe, fpr,

1750

2251

self.client_address)

1751

2252

except KeyError:

1752

2253

return

1753

2254

1754

2255

if client.approval_delay:

1755

2256

delay = client.approval_delay

1756

2257

client.approvals_pending += 1

1757

2258

approval_required = True

1758

2259

1759

2260

while True:

1760

2261

if not client.enabled:

1761

2262

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

1764

2265

# Emit D-Bus signal

1765

2266

client.Rejected("Disabled")

1766

2267

return

1767

2268

1768

2269

if client.approved or not client.approval_delay:

1769

#We are approved or approval is disabled

2270

# We are approved or approval is disabled

1770

2271

break

1771

2272

elif client.approved is None:

1772

2273

logger.info("Client %s needs approval",

1783

2284

# Emit D-Bus signal

1784

2285

client.Rejected("Denied")

1785

2286

return

1786

1787

#wait until timeout or approved

2287

2288

# wait until timeout or approved

1788

2289

time = datetime.datetime.now()

1789

2290

client.changedstate.acquire()

1790

2291

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

1803

2304

break

1804

2305

else:

1805

2306

delay -= time2 - time

1806

1807

sent_size = 0

1808

while sent_size < len(client.secret):

1809

try:

1810

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

1811

except gnutls.errors.GNUTLSError as error:

1812

logger.warning("gnutls send failed",

1813

exc_info=error)

1814

return

1815

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

1816

len(client.secret) - (sent_size

1817

+ sent))

1818

sent_size += sent

1819

2307

2308

try:

2309

session.send(client.secret)

2310

except gnutls.Error as error:

2311

logger.warning("gnutls send failed",

2312

exc_info=error)

2313

return

2314

1820

2315

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

1821

2316

# bump the timeout using extended_timeout

1822

2317

client.bump_timeout(client.extended_timeout)

1823

2318

if self.server.use_dbus:

1824

2319

# Emit D-Bus signal

1825

2320

client.GotSecret()

1826

2321

1827

2322

finally:

1828

2323

if approval_required:

1829

2324

client.approvals_pending -= 1

1830

2325

try:

1831

2326

session.bye()

1832

except gnutls.errors.GNUTLSError as error:

2327

except gnutls.Error as error:

1833

2328

logger.warning("GnuTLS bye failed",

1834

2329

exc_info=error)

1835

2330

1836

2331

@staticmethod

1837

2332

def peer_certificate(session):

1838

2333

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

1839

2334

# If not an OpenPGP certificate...

1840

if (gnutls.library.functions.gnutls_certificate_type_get(

1841

session._c_object)

1842

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

1843

# ...do the normal thing

1844

return session.peer_certificate

2335

if (gnutls.certificate_type_get(session._c_object)

2336

!= gnutls.CRT_OPENPGP):

2337

# ...return invalid data

2338

return b""

1845

2339

list_size = ctypes.c_uint(1)

1846

cert_list = (gnutls.library.functions

1847

.gnutls_certificate_get_peers

2340

cert_list = (gnutls.certificate_get_peers

1848

2341

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

1849

2342

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

1850

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

1851

" certificate")

2343

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

1852

2344

if list_size.value == 0:

1853

2345

return None

1854

2346

cert = cert_list[0]

1855

2347

return ctypes.string_at(cert.data, cert.size)

1856

2348

1857

2349

@staticmethod

1858

2350

def fingerprint(openpgp):

1859

2351

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

1860

2352

# New GnuTLS "datum" with the OpenPGP public key

1861

datum = gnutls.library.types.gnutls_datum_t(

2353

datum = gnutls.datum_t(

1862

2354

ctypes.cast(ctypes.c_char_p(openpgp),

1863

2355

ctypes.POINTER(ctypes.c_ubyte)),

1864

2356

ctypes.c_uint(len(openpgp)))

1865

2357

# New empty GnuTLS certificate

1866

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1867

gnutls.library.functions.gnutls_openpgp_crt_init(

1868

ctypes.byref(crt))

2358

crt = gnutls.openpgp_crt_t()

2359

gnutls.openpgp_crt_init(ctypes.byref(crt))

1869

2360

# Import the OpenPGP public key into the certificate

1870

gnutls.library.functions.gnutls_openpgp_crt_import(

1871

crt, ctypes.byref(datum),

1872

gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)

2361

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

2362

gnutls.OPENPGP_FMT_RAW)

1873

2363

# Verify the self signature in the key

1874

2364

crtverify = ctypes.c_uint()

1875

gnutls.library.functions.gnutls_openpgp_crt_verify_self(

1876

crt, 0, ctypes.byref(crtverify))

2365

gnutls.openpgp_crt_verify_self(crt, 0,

2366

ctypes.byref(crtverify))

1877

2367

if crtverify.value != 0:

1878

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1879

raise gnutls.errors.CertificateSecurityError(

1880

"Verify failed")

2368

gnutls.openpgp_crt_deinit(crt)

2369

raise gnutls.CertificateSecurityError("Verify failed")

1881

2370

# New buffer for the fingerprint

1882

2371

buf = ctypes.create_string_buffer(20)

1883

2372

buf_len = ctypes.c_size_t()

1884

2373

# Get the fingerprint from the certificate into the buffer

1885

gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint(

1886

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

2374

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

2375

ctypes.byref(buf_len))

1887

2376

# Deinit the certificate

1888

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2377

gnutls.openpgp_crt_deinit(crt)

1889

2378

# Convert the buffer to a Python bytestring

1890

2379

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

1891

2380

# Convert the bytestring to hexadecimal notation

1895

2384

1896

2385

class MultiprocessingMixIn(object):

1897

2386

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

1898

2387

1899

2388

def sub_process_main(self, request, address):

1900

2389

try:

1901

2390

self.finish_request(request, address)

1902

2391

except Exception:

1903

2392

self.handle_error(request, address)

1904

2393

self.close_request(request)

1905

2394

1906

2395

def process_request(self, request, address):

1907

2396

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

1908

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

1909

args = (request, address))

2397

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

2398

args=(request, address))

1910

2399

proc.start()

1911

2400

return proc

1912

2401

1913

2402

1914

2403

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1915

2404

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

1916

2405

1917

2406

def process_request(self, request, client_address):

1918

2407

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

1919

2408

1920

2409

This function creates a new pipe in self.pipe

1921

2410

"""

1922

2411

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1923

2412

1924

2413

proc = MultiprocessingMixIn.process_request(self, request,

1925

2414

client_address)

1926

2415

self.child_pipe.close()

1927

2416

self.add_pipe(parent_pipe, proc)

1928

2417

1929

2418

def add_pipe(self, parent_pipe, proc):

1930

2419

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

1931

2420

raise NotImplementedError()

1934

2423

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1935

2424

socketserver.TCPServer, object):

1936

2425

"""IPv6-capable TCP server. Accepts 'None' as address and/or port

1937

2426

1938

2427

Attributes:

1939

2428

enabled: Boolean; whether this server is activated yet

1940

2429

interface: None or a network interface name (string)

1941

2430

use_ipv6: Boolean; to use IPv6 or not

1942

2431

"""

1943

2432

1944

2433

def __init__(self, server_address, RequestHandlerClass,

1945

2434

interface=None,

1946

2435

use_ipv6=True,

1956

2445

self.socketfd = socketfd

1957

2446

# Save the original socket.socket() function

1958

2447

self.socket_socket = socket.socket

2448

1959

2449

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

1960

#

2450

#

1961

2451

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

1962

2452

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

1963

2453

# patching socket.socket.)

1964

#

2454

#

1965

2455

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

1966

2456

@functools.wraps(socket.socket)

1967

2457

def socket_wrapper(*args, **kwargs):

1979

2469

# socket_wrapper(), if socketfd was set.

1980

2470

socketserver.TCPServer.__init__(self, server_address,

1981

2471

RequestHandlerClass)

1982

2472

1983

2473

def server_bind(self):

1984

2474

"""This overrides the normal server_bind() function

1985

2475

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

1986

2476

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

2477

global SO_BINDTODEVICE

1987

2478

if self.interface is not None:

1988

2479

if SO_BINDTODEVICE is None:

1989

logger.error("SO_BINDTODEVICE does not exist;"

1990

" cannot bind to interface %s",

1991

self.interface)

1992

else:

1993

try:

1994

self.socket.setsockopt(

1995

socket.SOL_SOCKET, SO_BINDTODEVICE,

1996

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

1997

except socket.error as error:

1998

if error.errno == errno.EPERM:

1999

logger.error("No permission to bind to"

2000

" interface %s", self.interface)

2001

elif error.errno == errno.ENOPROTOOPT:

2002

logger.error("SO_BINDTODEVICE not available;"

2003

" cannot bind to interface %s",

2004

self.interface)

2005

elif error.errno == errno.ENODEV:

2006

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

2007

" cannot bind", self.interface)

2008

else:

2009

raise

2480

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

2481

# common enough.

2482

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

2483

SO_BINDTODEVICE = 25

2484

try:

2485

self.socket.setsockopt(

2486

socket.SOL_SOCKET, SO_BINDTODEVICE,

2487

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

2488

except socket.error as error:

2489

if error.errno == errno.EPERM:

2490

logger.error("No permission to bind to"

2491

" interface %s", self.interface)

2492

elif error.errno == errno.ENOPROTOOPT:

2493

logger.error("SO_BINDTODEVICE not available;"

2494

" cannot bind to interface %s",

2495

self.interface)

2496

elif error.errno == errno.ENODEV:

2497

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

2498

" cannot bind", self.interface)

2499

else:

2500

raise

2010

2501

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

2011

2502

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

2012

2503

if not self.server_address[0]:

2013

2504

if self.address_family == socket.AF_INET6:

2014

any_address = "::" # in6addr_any

2505

any_address = "::" # in6addr_any

2015

2506

else:

2016

any_address = "0.0.0.0" # INADDR_ANY

2507

any_address = "0.0.0.0" # INADDR_ANY

2017

2508

self.server_address = (any_address,

2018

2509

self.server_address[1])

2019

2510

elif not self.server_address[1]:

2029

2520

2030

2521

class MandosServer(IPv6_TCPServer):

2031

2522

"""Mandos server.

2032

2523

2033

2524

Attributes:

2034

2525

clients: set of Client objects

2035

2526

gnutls_priority GnuTLS priority string

2036

2527

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

2037

2038

Assumes a gobject.MainLoop event loop.

2528

2529

Assumes a GLib.MainLoop event loop.

2039

2530

"""

2040

2531

2041

2532

def __init__(self, server_address, RequestHandlerClass,

2042

2533

interface=None,

2043

2534

use_ipv6=True,

2053

2544

self.gnutls_priority = gnutls_priority

2054

2545

IPv6_TCPServer.__init__(self, server_address,

2055

2546

RequestHandlerClass,

2056

interface = interface,

2057

use_ipv6 = use_ipv6,

2058

socketfd = socketfd)

2059

2547

interface=interface,

2548

use_ipv6=use_ipv6,

2549

socketfd=socketfd)

2550

2060

2551

def server_activate(self):

2061

2552

if self.enabled:

2062

2553

return socketserver.TCPServer.server_activate(self)

2063

2554

2064

2555

def enable(self):

2065

2556

self.enabled = True

2066

2557

2067

2558

def add_pipe(self, parent_pipe, proc):

2068

2559

# Call "handle_ipc" for both data and EOF events

2069

gobject.io_add_watch(

2560

GLib.io_add_watch(

2070

2561

parent_pipe.fileno(),

2071

gobject.IO_IN | gobject.IO_HUP,

2562

GLib.IO_IN | GLib.IO_HUP,

2072

2563

functools.partial(self.handle_ipc,

2073

parent_pipe = parent_pipe,

2074

proc = proc))

2075

2564

parent_pipe=parent_pipe,

2565

proc=proc))

2566

2076

2567

def handle_ipc(self, source, condition,

2077

2568

parent_pipe=None,

2078

proc = None,

2569

proc=None,

2079

2570

client_object=None):

2080

2571

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

2081

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

2572

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

2082

2573

# Wait for other process to exit

2083

2574

proc.join()

2084

2575

return False

2085

2576

2086

2577

# Read a request from the child

2087

2578

request = parent_pipe.recv()

2088

2579

command = request[0]

2089

2580

2090

2581

if command == 'init':

2091

fpr = request[1]

2582

fpr = request[1].decode("ascii")

2092

2583

address = request[2]

2093

2094

for c in self.clients.itervalues():

2584

2585

for c in self.clients.values():

2095

2586

if c.fingerprint == fpr:

2096

2587

client = c

2097

2588

break

2104

2595

address[0])

2105

2596

parent_pipe.send(False)

2106

2597

return False

2107

2108

gobject.io_add_watch(

2598

2599

GLib.io_add_watch(

2109

2600

parent_pipe.fileno(),

2110

gobject.IO_IN | gobject.IO_HUP,

2601

GLib.IO_IN | GLib.IO_HUP,

2111

2602

functools.partial(self.handle_ipc,

2112

parent_pipe = parent_pipe,

2113

proc = proc,

2114

client_object = client))

2603

parent_pipe=parent_pipe,

2604

proc=proc,

2605

client_object=client))

2115

2606

parent_pipe.send(True)

2116

2607

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

2117

2608

# same fileno

2120

2611

funcname = request[1]

2121

2612

args = request[2]

2122

2613

kwargs = request[3]

2123

2614

2124

2615

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

2125

2616

funcname)(*args,

2126

2617

**kwargs)))

2127

2618

2128

2619

if command == 'getattr':

2129

2620

attrname = request[1]

2130

if callable(client_object.__getattribute__(attrname)):

2621

if isinstance(client_object.__getattribute__(attrname),

2622

collections.Callable):

2131

2623

parent_pipe.send(('function', ))

2132

2624

else:

2133

2625

parent_pipe.send((

2134

2626

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

2135

2627

2136

2628

if command == 'setattr':

2137

2629

attrname = request[1]

2138

2630

value = request[2]

2139

2631

setattr(client_object, attrname, value)

2140

2632

2141

2633

return True

2142

2634

2143

2635

2144

2636

def rfc3339_duration_to_delta(duration):

2145

2637

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

2146

2638

2147

2639

>>> rfc3339_duration_to_delta("P7D")

2148

2640

datetime.timedelta(7)

2149

2641

>>> rfc3339_duration_to_delta("PT60S")

2159

2651

>>> rfc3339_duration_to_delta("P1DT3M20S")

2160

2652

datetime.timedelta(1, 200)

2161

2653

"""

2162

2654

2163

2655

# Parsing an RFC 3339 duration with regular expressions is not

2164

2656

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

2165

2657

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

2166

2658

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

2167

2659

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

2168

2660

# avoid excessive use of external libraries.

2169

2661

2170

2662

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

2171

Token = collections.namedtuple("Token",

2172

("regexp", # To match token; if

2173

# "value" is not None,

2174

# must have a "group"

2175

# containing digits

2176

"value", # datetime.timedelta or

2177

# None

2178

"followers")) # Tokens valid after

2179

# this token

2180

2663

Token = collections.namedtuple("Token", (

2181

2664

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

2182

2665

# a "group" containing digits

2214

2697

frozenset((token_year, token_month,

2215

2698

token_day, token_time,

2216

2699

token_week)))

2217

# Define starting values

2218

value = datetime.timedelta() # Value so far

2700

# Define starting values:

2701

# Value so far

2702

value = datetime.timedelta()

2219

2703

found_token = None

2220

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

2221

s = duration # String left to parse

2704

# Following valid tokens

2705

followers = frozenset((token_duration, ))

2706

# String left to parse

2707

s = duration

2222

2708

# Loop until end token is found

2223

2709

while found_token is not token_end:

2224

2710

# Search for any currently valid tokens

2240

2726

break

2241

2727

else:

2242

2728

# No currently valid tokens were found

2243

raise ValueError("Invalid RFC 3339 duration")

2729

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

2730

.format(duration))

2244

2731

# End token found

2245

2732

return value

2246

2733

2247

2734

2248

2735

def string_to_delta(interval):

2249

2736

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

2250

2737

2251

2738

>>> string_to_delta('7d')

2252

2739

datetime.timedelta(7)

2253

2740

>>> string_to_delta('60s')

2261

2748

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

2262

2749

datetime.timedelta(0, 330)

2263

2750

"""

2264

2751

2265

2752

try:

2266

2753

return rfc3339_duration_to_delta(interval)

2267

2754

except ValueError:

2268

2755

pass

2269

2756

2270

2757

timevalue = datetime.timedelta(0)

2271

2758

for s in interval.split():

2272

2759

try:

2290

2777

return timevalue

2291

2778

2292

2779

2293

def daemon(nochdir = False, noclose = False):

2780

def daemon(nochdir=False, noclose=False):

2294

2781

"""See daemon(3). Standard BSD Unix function.

2295

2782

2296

2783

This should really exist as os.daemon, but it doesn't (yet)."""

2297

2784

if os.fork():

2298

2785

sys.exit()

2316

2803

2317

2804

2318

2805

def main():

2319

2806

2320

2807

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

2321

2808

# Parsing of options, both command line and config file

2322

2809

2323

2810

parser = argparse.ArgumentParser()

2324

2811

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

2325

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

2812

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

2326

2813

help="show version number and exit")

2327

2814

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

2328

2815

help="Bind to interface IF")

2364

2851

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

2365

2852

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

2366

2853

default=None)

2367

2854

2368

2855

options = parser.parse_args()

2369

2856

2370

2857

if options.check:

2371

2858

import doctest

2372

2859

fail_count, test_count = doctest.testmod()

2373

2860

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

2374

2861

2375

2862

# Default values for config file for server-global settings

2376

server_defaults = { "interface": "",

2377

"address": "",

2378

"port": "",

2379

"debug": "False",

2380

"priority":

2381

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

2382

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

2383

"servicename": "Mandos",

2384

"use_dbus": "True",

2385

"use_ipv6": "True",

2386

"debuglevel": "",

2387

"restore": "True",

2388

"socket": "",

2389

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

2390

"foreground": "False",

2391

"zeroconf": "True",

2392

}

2393

2863

server_defaults = {"interface": "",

2864

"address": "",

2865

"port": "",

2866

"debug": "False",

2867

"priority":

2868

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

2869

":+SIGN-DSA-SHA256",

2870

"servicename": "Mandos",

2871

"use_dbus": "True",

2872

"use_ipv6": "True",

2873

"debuglevel": "",

2874

"restore": "True",

2875

"socket": "",

2876

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

2877

"foreground": "False",

2878

"zeroconf": "True",

2879

}

2880

2394

2881

# Parse config file for server-global settings

2395

2882

server_config = configparser.SafeConfigParser(server_defaults)

2396

2883

del server_defaults

2398

2885

# Convert the SafeConfigParser object to a dict

2399

2886

server_settings = server_config.defaults()

2400

2887

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

2401

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

2888

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

2889

"foreground", "zeroconf"):

2402

2890

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

2403

2891

option)

2404

2892

if server_settings["port"]:

2414

2902

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

2415

2903

["socket"])

2416

2904

del server_config

2417

2905

2418

2906

# Override the settings from the config file with command line

2419

2907

# options, if set.

2420

2908

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

2438

2926

if server_settings["debug"]:

2439

2927

server_settings["foreground"] = True

2440

2928

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

2441

2929

2442

2930

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

2443

2931

2444

2932

if (not server_settings["zeroconf"]

2445

2933

and not (server_settings["port"]

2446

2934

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

2447

2935

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

2448

2936

2449

2937

# For convenience

2450

2938

debug = server_settings["debug"]

2451

2939

debuglevel = server_settings["debuglevel"]

2455

2943

stored_state_file)

2456

2944

foreground = server_settings["foreground"]

2457

2945

zeroconf = server_settings["zeroconf"]

2458

2946

2459

2947

if debug:

2460

2948

initlogger(debug, logging.DEBUG)

2461

2949

else:

2464

2952

else:

2465

2953

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

2466

2954

initlogger(debug, level)

2467

2955

2468

2956

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

2469

2957

syslogger.setFormatter(

2470

2958

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

2471

2959

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

2472

2960

server_settings["servicename"])))

2473

2961

2474

2962

# Parse config file with clients

2475

2963

client_config = configparser.SafeConfigParser(Client

2476

2964

.client_defaults)

2477

2965

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

2478

2966

"clients.conf"))

2479

2967

2480

2968

global mandos_dbus_service

2481

2969

mandos_dbus_service = None

2482

2970

2483

2971

socketfd = None

2484

2972

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

2485

2973

socketfd = server_settings["socket"]

2497

2985

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

2498

2986

pidfile = None

2499

2987

try:

2500

pidfile = open(pidfilename, "w")

2988

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

2501

2989

except IOError as e:

2502

2990

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

2503

2991

exc_info=e)

2504

2505

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

2992

2993

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

2994

("mandos", "mandos"),

2995

("nobody", "nogroup")):

2506

2996

try:

2507

2997

uid = pwd.getpwnam(name).pw_uid

2508

gid = pwd.getpwnam(name).pw_gid

2998

gid = pwd.getpwnam(group).pw_gid

2509

2999

break

2510

3000

except KeyError:

2511

3001

continue

2515

3005

try:

2516

3006

os.setgid(gid)

2517

3007

os.setuid(uid)

3008

if debug:

3009

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

3010

gid))

2518

3011

except OSError as error:

3012

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

3013

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

2519

3014

if error.errno != errno.EPERM:

2520

3015

raise

2521

3016

2522

3017

if debug:

2523

3018

# Enable all possible GnuTLS debugging

2524

3019

2525

3020

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

2526

3021

# - GnuTLS manual

2527

gnutls.library.functions.gnutls_global_set_log_level(11)

2528

2529

@gnutls.library.types.gnutls_log_func

3022

gnutls.global_set_log_level(11)

3023

3024

@gnutls.log_func

2530

3025

def debug_gnutls(level, string):

2531

3026

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

2532

2533

gnutls.library.functions.gnutls_global_set_log_function(

2534

debug_gnutls)

2535

3027

3028

gnutls.global_set_log_function(debug_gnutls)

3029

2536

3030

# Redirect stdin so all checkers get /dev/null

2537

3031

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

2538

3032

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

2539

3033

if null > 2:

2540

3034

os.close(null)

2541

3035

2542

3036

# Need to fork before connecting to D-Bus

2543

3037

if not foreground:

2544

3038

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

2545

3039

daemon()

2546

2547

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

2548

# need to inform gobject that threads will be used.

2549

gobject.threads_init()

2550

3040

3041

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

3042

# to inform GLib that threads will be used.

3043

GLib.threads_init()

3044

2551

3045

global main_loop

2552

3046

# From the Avahi example code

2553

3047

DBusGMainLoop(set_as_default=True)

2554

main_loop = gobject.MainLoop()

3048

main_loop = GLib.MainLoop()

2555

3049

bus = dbus.SystemBus()

2556

3050

# End of Avahi example code

2557

3051

if use_dbus:

2562

3056

old_bus_name = dbus.service.BusName(

2563

3057

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

2564

3058

do_not_queue=True)

2565

except dbus.exceptions.NameExistsException as e:

3059

except dbus.exceptions.DBusException as e:

2566

3060

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

2567

3061

use_dbus = False

2568

3062

server_settings["use_dbus"] = False

2570

3064

if zeroconf:

2571

3065

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2572

3066

service = AvahiServiceToSyslog(

2573

name = server_settings["servicename"],

2574

servicetype = "_mandos._tcp",

2575

protocol = protocol,

2576

bus = bus)

3067

name=server_settings["servicename"],

3068

servicetype="_mandos._tcp",

3069

protocol=protocol,

3070

bus=bus)

2577

3071

if server_settings["interface"]:

2578

3072

service.interface = if_nametoindex(

2579

3073

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

2580

3074

2581

3075

global multiprocessing_manager

2582

3076

multiprocessing_manager = multiprocessing.Manager()

2583

3077

2584

3078

client_class = Client

2585

3079

if use_dbus:

2586

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

2587

3080

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

3081

2588

3082

client_settings = Client.config_parser(client_config)

2589

3083

old_client_settings = {}

2590

3084

clients_data = {}

2591

3085

2592

3086

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

2593

3087

global wnull

2594

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

3088

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

2595

3089

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

2596

3090

# mode

2597

3091

if debug or not foreground:

2598

3092

wnull.close()

2599

3093

2600

3094

# Get client data and settings from last running state.

2601

3095

if server_settings["restore"]:

2602

3096

try:

2603

3097

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

2604

clients_data, old_client_settings = pickle.load(

2605

stored_state)

3098

if sys.version_info.major == 2:

3099

clients_data, old_client_settings = pickle.load(

3100

stored_state)

3101

else:

3102

bytes_clients_data, bytes_old_client_settings = (

3103

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

3104

# Fix bytes to strings

3105

# clients_data

3106

# .keys()

3107

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

3108

if isinstance(key, bytes)

3109

else key): value

3110

for key, value in

3111

bytes_clients_data.items()}

3112

del bytes_clients_data

3113

for key in clients_data:

3114

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

3115

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

3116

for k, v in

3117

clients_data[key].items()}

3118

clients_data[key] = value

3119

# .client_structure

3120

value["client_structure"] = [

3121

(s.decode("utf-8")

3122

if isinstance(s, bytes)

3123

else s) for s in

3124

value["client_structure"]]

3125

# .name & .host

3126

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

3127

if isinstance(value[k], bytes):

3128

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

3129

# old_client_settings

3130

# .keys()

3131

old_client_settings = {

3132

(key.decode("utf-8")

3133

if isinstance(key, bytes)

3134

else key): value

3135

for key, value in

3136

bytes_old_client_settings.items()}

3137

del bytes_old_client_settings

3138

# .host

3139

for value in old_client_settings.values():

3140

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

3141

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

3142

.decode("utf-8"))

2606

3143

os.remove(stored_state_path)

2607

3144

except IOError as e:

2608

3145

if e.errno == errno.ENOENT:

2616

3153

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

2617

3154

"EOFError:",

2618

3155

exc_info=e)

2619

3156

2620

3157

with PGPEngine() as pgp:

2621

3158

for client_name, client in clients_data.items():

2622

3159

# Skip removed clients

2623

3160

if client_name not in client_settings:

2624

3161

continue

2625

3162

2626

3163

# Decide which value to use after restoring saved state.

2627

3164

# We have three different values: Old config file,

2628

3165

# new config file, and saved state.

2639

3176

client[name] = value

2640

3177

except KeyError:

2641

3178

pass

2642

3179

2643

3180

# Clients who has passed its expire date can still be

2644

3181

# enabled if its last checker was successful. A Client

2645

3182

# whose checker succeeded before we stored its state is

2678

3215

client_name))

2679

3216

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

2680

3217

["secret"])

2681

3218

2682

3219

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

2683

3220

for client_name in (set(old_client_settings)

2684

3221

- set(client_settings)):

2686

3223

for client_name in (set(client_settings)

2687

3224

- set(old_client_settings)):

2688

3225

clients_data[client_name] = client_settings[client_name]

2689

3226

2690

3227

# Create all client objects

2691

3228

for client_name, client in clients_data.items():

2692

3229

tcp_server.clients[client_name] = client_class(

2693

name = client_name,

2694

settings = client,

2695

server_settings = server_settings)

2696

3230

name=client_name,

3231

settings=client,

3232

server_settings=server_settings)

3233

2697

3234

if not tcp_server.clients:

2698

3235

logger.warning("No clients defined")

2699

3236

2700

3237

if not foreground:

2701

3238

if pidfile is not None:

3239

pid = os.getpid()

2702

3240

try:

2703

3241

with pidfile:

2704

pid = os.getpid()

2705

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

3242

print(pid, file=pidfile)

2706

3243

except IOError:

2707

3244

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

2708

3245

pidfilename, pid)

2709

3246

del pidfile

2710

3247

del pidfilename

2711

2712

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

2713

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

2714

3248

3249

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

3250

GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,

3251

lambda: main_loop.quit() and False)

3252

2715

3253

if use_dbus:

2716

3254

2717

3255

@alternate_dbus_interfaces(

2718

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

2719

class MandosDBusService(DBusObjectWithProperties):

3256

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

3257

class MandosDBusService(DBusObjectWithObjectManager):

2720

3258

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

2721

3259

2722

3260

def __init__(self):

2723

3261

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

2724

3262

2725

3263

_interface = "se.recompile.Mandos"

2726

2727

@dbus_interface_annotations(_interface)

2728

def _foo(self):

2729

return {

2730

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

2731

"false" }

2732

3264

2733

3265

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

2734

3266

def ClientAdded(self, objpath):

2735

3267

"D-Bus signal"

2736

3268

pass

2737

3269

2738

3270

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

2739

3271

def ClientNotFound(self, fingerprint, address):

2740

3272

"D-Bus signal"

2741

3273

pass

2742

3274

3275

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

3276

"true"})

2743

3277

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

2744

3278

def ClientRemoved(self, objpath, name):

2745

3279

"D-Bus signal"

2746

3280

pass

2747

3281

3282

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

3283

"true"})

2748

3284

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

2749

3285

def GetAllClients(self):

2750

3286

"D-Bus method"

2751

3287

return dbus.Array(c.dbus_object_path for c in

2752

tcp_server.clients.itervalues())

2753

3288

tcp_server.clients.values())

3289

3290

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

3291

"true"})

2754

3292

@dbus.service.method(_interface,

2755

3293

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

2756

3294

def GetAllClientsWithProperties(self):

2757

3295

"D-Bus method"

2758

3296

return dbus.Dictionary(

2759

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

2760

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

3297

{c.dbus_object_path: c.GetAll(

3298

"se.recompile.Mandos.Client")

3299

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

2761

3300

signature="oa{sv}")

2762

3301

2763

3302

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

2764

3303

def RemoveClient(self, object_path):

2765

3304

"D-Bus method"

2766

for c in tcp_server.clients.itervalues():

3305

for c in tcp_server.clients.values():

2767

3306

if c.dbus_object_path == object_path:

2768

3307

del tcp_server.clients[c.name]

2769

3308

c.remove_from_connection()

2770

# Don't signal anything except ClientRemoved

3309

# Don't signal the disabling

2771

3310

c.disable(quiet=True)

2772

# Emit D-Bus signal

2773

self.ClientRemoved(object_path, c.name)

3311

# Emit D-Bus signal for removal

3312

self.client_removed_signal(c)

2774

3313

return

2775

3314

raise KeyError(object_path)

2776

3315

2777

3316

del _interface

2778

3317

3318

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

3319

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

3320

def GetManagedObjects(self):

3321

"""D-Bus method"""

3322

return dbus.Dictionary(

3323

{client.dbus_object_path:

3324

dbus.Dictionary(

3325

{interface: client.GetAll(interface)

3326

for interface in

3327

client._get_all_interface_names()})

3328

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

3329

3330

def client_added_signal(self, client):

3331

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

3332

if use_dbus:

3333

# New standard signal

3334

self.InterfacesAdded(

3335

client.dbus_object_path,

3336

dbus.Dictionary(

3337

{interface: client.GetAll(interface)

3338

for interface in

3339

client._get_all_interface_names()}))

3340

# Old signal

3341

self.ClientAdded(client.dbus_object_path)

3342

3343

def client_removed_signal(self, client):

3344

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

3345

if use_dbus:

3346

# New standard signal

3347

self.InterfacesRemoved(

3348

client.dbus_object_path,

3349

client._get_all_interface_names())

3350

# Old signal

3351

self.ClientRemoved(client.dbus_object_path,

3352

client.name)

3353

2779

3354

mandos_dbus_service = MandosDBusService()

2780

3355

3356

# Save modules to variables to exempt the modules from being

3357

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

3358

mp = multiprocessing

3359

wn = wnull

3360

2781

3361

def cleanup():

2782

3362

"Cleanup function; run on exit"

2783

3363

if zeroconf:

2784

3364

service.cleanup()

2785

2786

multiprocessing.active_children()

2787

wnull.close()

3365

3366

mp.active_children()

3367

wn.close()

2788

3368

if not (tcp_server.clients or client_settings):

2789

3369

return

2790

3370

2791

3371

# Store client before exiting. Secrets are encrypted with key

2792

3372

# based on what config file has. If config file is

2793

3373

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

2794

3374

clients = {}

2795

3375

with PGPEngine() as pgp:

2796

for client in tcp_server.clients.itervalues():

3376

for client in tcp_server.clients.values():

2797

3377

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

2798

3378

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

2799

3379

key)

2800

3380

client_dict = {}

2801

3381

2802

3382

# A list of attributes that can not be pickled

2803

3383

# + secret.

2804

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

2805

"checker", "server_settings" }

3384

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

3385

"checker", "server_settings"}

2806

3386

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

2807

3387

.Object):

2808

3388

exclude.add(name)

2809

3389

2810

3390

client_dict["encrypted_secret"] = (client

2811

3391

.encrypted_secret)

2812

3392

for attr in client.client_structure:

2813

3393

if attr not in exclude:

2814

3394

client_dict[attr] = getattr(client, attr)

2815

3395

2816

3396

clients[client.name] = client_dict

2817

3397

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

2818

3398

2819

3399

try:

2820

3400

with tempfile.NamedTemporaryFile(

2821

3401

mode='wb',

2823

3403

prefix='clients-',

2824

3404

dir=os.path.dirname(stored_state_path),

2825

3405

delete=False) as stored_state:

2826

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

3406

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

3407

protocol=2)

2827

3408

tempname = stored_state.name

2828

3409

os.rename(tempname, stored_state_path)

2829

3410

except (IOError, OSError) as e:

2839

3420

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

2840

3421

exc_info=e)

2841

3422

raise

2842

3423

2843

3424

# Delete all clients, and settings from config

2844

3425

while tcp_server.clients:

2845

3426

name, client = tcp_server.clients.popitem()

2846

3427

if use_dbus:

2847

3428

client.remove_from_connection()

2848

# Don't signal anything except ClientRemoved

3429

# Don't signal the disabling

2849

3430

client.disable(quiet=True)

3431

# Emit D-Bus signal for removal

2850

3432

if use_dbus:

2851

# Emit D-Bus signal

2852

mandos_dbus_service.ClientRemoved(

2853

client.dbus_object_path, client.name)

3433

mandos_dbus_service.client_removed_signal(client)

2854

3434

client_settings.clear()

2855

3435

2856

3436

atexit.register(cleanup)

2857

2858

for client in tcp_server.clients.itervalues():

3437

3438

for client in tcp_server.clients.values():

2859

3439

if use_dbus:

2860

# Emit D-Bus signal

2861

mandos_dbus_service.ClientAdded(client.dbus_object_path)

3440

# Emit D-Bus signal for adding

3441

mandos_dbus_service.client_added_signal(client)

2862

3442

# Need to initiate checking of clients

2863

3443

if client.enabled:

2864

3444

client.init_checker()

2865

3445

2866

3446

tcp_server.enable()

2867

3447

tcp_server.server_activate()

2868

3448

2869

3449

# Find out what port we got

2870

3450

if zeroconf:

2871

3451

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

2876

3456

else: # IPv4

2877

3457

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

2878

3458

*tcp_server.socket.getsockname())

2879

2880

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

2881

3459

3460

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

3461

2882

3462

try:

2883

3463

if zeroconf:

2884

3464

# From the Avahi example code

2889

3469

cleanup()

2890

3470

sys.exit(1)

2891

3471

# End of Avahi example code

2892

2893

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

2894

lambda *args, **kwargs:

2895

(tcp_server.handle_request

2896

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

2897

3472

3473

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

3474

lambda *args, **kwargs:

3475

(tcp_server.handle_request

3476

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

3477

2898

3478

logger.debug("Starting main loop")

2899

3479

main_loop.run()

2900

3480

except AvahiError as error: