/mandos/trunk : revision 922

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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 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 = "1.7.1"

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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

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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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'--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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decrypted_plaintext, 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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decrypted_plaintext, 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 decrypted_plaintext

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# Pretend that we have an Avahi module

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class Avahi(object):

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

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

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

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

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PROTO_INET = 0 # avahi-common/address.h

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PROTO_INET6 = 1 # avahi-common/address.h

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DBUS_NAME = "org.freedesktop.Avahi"

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DBUS_INTERFACE_ENTRY_GROUP = DBUS_NAME + ".EntryGroup"

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DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"

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DBUS_PATH_SERVER = "/"

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def string_array_to_txt_array(self, t):

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

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

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ENTRY_GROUP_ESTABLISHED = 2 # avahi-common/defs.h

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ENTRY_GROUP_COLLISION = 3 # avahi-common/defs.h

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ENTRY_GROUP_FAILURE = 4 # avahi-common/defs.h

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SERVER_INVALID = 0 # avahi-common/defs.h

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SERVER_REGISTERING = 1 # avahi-common/defs.h

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SERVER_RUNNING = 2 # avahi-common/defs.h

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SERVER_COLLISION = 3 # avahi-common/defs.h

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SERVER_FAILURE = 4 # avahi-common/defs.h

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avahi = Avahi()

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class AvahiError(Exception):

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

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self.value = value

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class AvahiService(object):

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"""An Avahi (Zeroconf) service.

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Attributes:

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

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Used to optionally bind to the specified interface.

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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def __init__(self,

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interface = avahi.IF_UNSPEC,

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name = None,

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servicetype = None,

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port = None,

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TXT = None,

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domain = "",

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host = "",

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max_renames = 32768,

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protocol = avahi.PROTO_UNSPEC,

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bus = None):

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interface=avahi.IF_UNSPEC,

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name=None,

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servicetype=None,

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port=None,

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TXT=None,

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domain="",

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host="",

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max_renames=32768,

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protocol=avahi.PROTO_UNSPEC,

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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

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self.entry_group_state_changed_match = None

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def rename(self, remove=True):

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

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if self.rename_count >= self.max_renames:

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

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self.cleanup()

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os._exit(1)

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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426

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if state == avahi.ENTRY_GROUP_ESTABLISHED:

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logger.debug("Zeroconf service established.")

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elif state == avahi.ENTRY_GROUP_COLLISION:

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433

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

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str(error))

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

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436

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def cleanup(self):

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

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if self.group is not None:

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pass

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self.group = None

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self.remove()

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

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

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

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

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else:

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

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def activate(self):

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

418

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if self.server is None:

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class AvahiServiceToSyslog(AvahiService):

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

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

432

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

499

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

500

**kwargs)

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syslogger.setFormatter(logging.Formatter(

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

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.format(self.name)))

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return ret

437

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# 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"

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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))

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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)

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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

438

770

def call_pipe(connection, # : multiprocessing.Connection

439

771

func, *args, **kwargs):

440

772

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

441

773

442

774

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

443

775

return value on the provided multiprocessing.Connection.

444

776

"""

445

777

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

446

778

connection.close()

447

779

780

448

781

class Client(object):

449

782

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

450

783

451

784

Attributes:

452

785

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

453

786

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

455

788

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

456

789

to see if the client lives.

457

790

'None' if no process is running.

458

checker_callback_tag: a gobject event source tag, or None

791

checker_callback_tag: a GLib event source tag, or None

459

792

checker_command: string; External command which is run to check

460

793

if client lives. %() expansions are done at

461

794

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

462

795

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

463

checker_initiator_tag: a gobject event source tag, or None

796

checker_initiator_tag: a GLib event source tag, or None

464

797

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

465

798

client_structure: Object describing what attributes a client has

466

799

and is used for storing the client at exit

467

800

current_checker_command: string; current running checker_command

468

disable_initiator_tag: a gobject event source tag, or None

801

disable_initiator_tag: a GLib event source tag, or None

469

802

enabled: bool()

470

803

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

471

804

uniquely identify the client

490

823

disabled, or None

491

824

server_settings: The server_settings dict from main()

492

825

"""

493

826

494

827

runtime_expansions = ("approval_delay", "approval_duration",

495

828

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

496

829

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

507

840

"approved_by_default": "True",

508

841

"enabled": "True",

509

842

}

510

843

511

844

@staticmethod

512

845

def config_parser(config):

513

846

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

520

853

for client_name in config.sections():

521

854

section = dict(config.items(client_name))

522

855

client = settings[client_name] = {}

523

856

524

857

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

525

858

# Reformat values from string types to Python types

526

859

client["approved_by_default"] = config.getboolean(

527

860

client_name, "approved_by_default")

528

861

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

529

862

"enabled")

530

863

531

864

# Uppercase and remove spaces from fingerprint for later

532

865

# comparison purposes with return value from the

533

866

# fingerprint() function

534

867

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

535

868

.replace(" ", ""))

536

869

if "secret" in section:

537

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

870

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

871

.encode("utf-8"),

872

"base64")

538

873

elif "secfile" in section:

539

874

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

540

875

(section["secfile"])),

555

890

client["last_approval_request"] = None

556

891

client["last_checked_ok"] = None

557

892

client["last_checker_status"] = -2

558

893

559

894

return settings

560

561

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

895

896

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

562

897

self.name = name

563

898

if server_settings is None:

564

899

server_settings = {}

566

901

# adding all client settings

567

902

for setting, value in settings.items():

568

903

setattr(self, setting, value)

569

904

570

905

if self.enabled:

571

906

if not hasattr(self, "last_enabled"):

572

907

self.last_enabled = datetime.datetime.utcnow()

576

911

else:

577

912

self.last_enabled = None

578

913

self.expires = None

579

914

580

915

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

581

916

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

582

917

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

583

918

datetime.datetime.utcnow())

584

919

585

920

# attributes specific for this server instance

586

921

self.checker = None

587

922

self.checker_initiator_tag = None

593

928

self.changedstate = multiprocessing_manager.Condition(

594

929

multiprocessing_manager.Lock())

595

930

self.client_structure = [attr

596

for attr in self.__dict__.iterkeys()

931

for attr in self.__dict__.keys()

597

932

if not attr.startswith("_")]

598

933

self.client_structure.append("client_structure")

599

934

600

935

for name, t in inspect.getmembers(

601

936

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

602

937

if not name.startswith("_"):

603

938

self.client_structure.append(name)

604

939

605

940

# Send notice to process children that client state has changed

606

941

def send_changedstate(self):

607

942

with self.changedstate:

608

943

self.changedstate.notify_all()

609

944

610

945

def enable(self):

611

946

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

612

947

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

617

952

self.last_enabled = datetime.datetime.utcnow()

618

953

self.init_checker()

619

954

self.send_changedstate()

620

955

621

956

def disable(self, quiet=True):

622

957

"""Disable this client."""

623

958

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

625

960

if not quiet:

626

961

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

627

962

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

628

gobject.source_remove(self.disable_initiator_tag)

963

GLib.source_remove(self.disable_initiator_tag)

629

964

self.disable_initiator_tag = None

630

965

self.expires = None

631

966

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

632

gobject.source_remove(self.checker_initiator_tag)

967

GLib.source_remove(self.checker_initiator_tag)

633

968

self.checker_initiator_tag = None

634

969

self.stop_checker()

635

970

self.enabled = False

636

971

if not quiet:

637

972

self.send_changedstate()

638

# 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

639

974

return False

640

975

641

976

def __del__(self):

642

977

self.disable()

643

978

644

979

def init_checker(self):

645

980

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

646

981

# and every interval from then on.

647

982

if self.checker_initiator_tag is not None:

648

gobject.source_remove(self.checker_initiator_tag)

649

self.checker_initiator_tag = gobject.timeout_add(

983

GLib.source_remove(self.checker_initiator_tag)

984

self.checker_initiator_tag = GLib.timeout_add(

650

985

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

651

986

self.start_checker)

652

987

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

653

988

if self.disable_initiator_tag is not None:

654

gobject.source_remove(self.disable_initiator_tag)

655

self.disable_initiator_tag = gobject.timeout_add(

989

GLib.source_remove(self.disable_initiator_tag)

990

self.disable_initiator_tag = GLib.timeout_add(

656

991

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

657

992

# Also start a new checker *right now*.

658

993

self.start_checker()

659

994

660

995

def checker_callback(self, source, condition, connection,

661

996

command):

662

997

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

665

1000

# Read return code from connection (see call_pipe)

666

1001

returncode = connection.recv()

667

1002

connection.close()

668

1003

669

1004

if returncode >= 0:

670

1005

self.last_checker_status = returncode

671

1006

self.last_checker_signal = None

681

1016

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

682

1017

vars(self))

683

1018

return False

684

1019

685

1020

def checked_ok(self):

686

1021

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

687

1022

self.last_checked_ok = datetime.datetime.utcnow()

688

1023

self.last_checker_status = 0

689

1024

self.last_checker_signal = None

690

1025

self.bump_timeout()

691

1026

692

1027

def bump_timeout(self, timeout=None):

693

1028

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

694

1029

if timeout is None:

695

1030

timeout = self.timeout

696

1031

if self.disable_initiator_tag is not None:

697

gobject.source_remove(self.disable_initiator_tag)

1032

GLib.source_remove(self.disable_initiator_tag)

698

1033

self.disable_initiator_tag = None

699

1034

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

700

self.disable_initiator_tag = gobject.timeout_add(

1035

self.disable_initiator_tag = GLib.timeout_add(

701

1036

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

702

1037

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

703

1038

704

1039

def need_approval(self):

705

1040

self.last_approval_request = datetime.datetime.utcnow()

706

1041

707

1042

def start_checker(self):

708

1043

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

709

1044

710

1045

If a checker already exists, leave it running and do

711

1046

nothing."""

712

1047

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

717

1052

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

718

1053

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

719

1054

# should be.

720

1055

721

1056

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

722

1057

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

723

1058

self.checker.join()

727

1062

# Escape attributes for the shell

728

1063

escaped_attrs = {

729

1064

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

730

for attr in self.runtime_expansions }

1065

for attr in self.runtime_expansions}

731

1066

try:

732

1067

command = self.checker_command % escaped_attrs

733

1068

except TypeError as error:

745

1080

# The exception is when not debugging but nevertheless

746

1081

# running in the foreground; use the previously

747

1082

# created wnull.

748

popen_args = { "close_fds": True,

749

"shell": True,

750

"cwd": "/" }

1083

popen_args = {"close_fds": True,

1084

"shell": True,

1085

"cwd": "/"}

751

1086

if (not self.server_settings["debug"]

752

1087

and self.server_settings["foreground"]):

753

1088

popen_args.update({"stdout": wnull,

754

"stderr": wnull })

755

pipe = multiprocessing.Pipe(duplex = False)

1089

"stderr": wnull})

1090

pipe = multiprocessing.Pipe(duplex=False)

756

1091

self.checker = multiprocessing.Process(

757

target = call_pipe,

758

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

759

kwargs = popen_args)

1092

target=call_pipe,

1093

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

1094

kwargs=popen_args)

760

1095

self.checker.start()

761

self.checker_callback_tag = gobject.io_add_watch(

762

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

1096

self.checker_callback_tag = GLib.io_add_watch(

1097

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

763

1098

self.checker_callback, pipe[0], command)

764

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

1099

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

765

1100

return True

766

1101

767

1102

def stop_checker(self):

768

1103

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

769

1104

if self.checker_callback_tag:

770

gobject.source_remove(self.checker_callback_tag)

1105

GLib.source_remove(self.checker_callback_tag)

771

1106

self.checker_callback_tag = None

772

1107

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

773

1108

return

782

1117

byte_arrays=False):

783

1118

"""Decorators for marking methods of a DBusObjectWithProperties to

784

1119

become properties on the D-Bus.

785

1120

786

1121

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

787

1122

and with one argument by "Set".

788

1123

789

1124

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

790

1125

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

791

1126

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

795

1130

if byte_arrays and signature != "ay":

796

1131

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

797

1132

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

798

1133

799

1134

def decorator(func):

800

1135

func._dbus_is_property = True

801

1136

func._dbus_interface = dbus_interface

804

1139

func._dbus_name = func.__name__

805

1140

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

806

1141

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

807

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

1142

func._dbus_get_args_options = {'byte_arrays': byte_arrays}

808

1143

return func

809

1144

810

1145

return decorator

811

1146

812

1147

813

1148

def dbus_interface_annotations(dbus_interface):

814

1149

"""Decorator for marking functions returning interface annotations

815

1150

816

1151

Usage:

817

1152

818

1153

@dbus_interface_annotations("org.example.Interface")

819

1154

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

820

1155

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

821

1156

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

822

1157

"false"}

823

1158

"""

824

1159

825

1160

def decorator(func):

826

1161

func._dbus_is_interface = True

827

1162

func._dbus_interface = dbus_interface

828

1163

func._dbus_name = dbus_interface

829

1164

return func

830

1165

831

1166

return decorator

832

1167

833

1168

834

1169

def dbus_annotations(annotations):

835

1170

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

836

1171

Usage:

837

1172

838

1173

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

839

1174

"org.freedesktop.DBus.Property."

840

1175

"EmitsChangedSignal": "false"})

842

1177

access="r")

843

1178

def Property_dbus_property(self):

844

1179

return dbus.Boolean(False)

845

1180

846

1181

See also the DBusObjectWithAnnotations class.

847

1182

"""

848

1183

849

1184

def decorator(func):

850

1185

func._dbus_annotations = annotations

851

1186

return func

852

1187

853

1188

return decorator

854

1189

855

1190

873

1208

874

1209

class DBusObjectWithAnnotations(dbus.service.Object):

875

1210

"""A D-Bus object with annotations.

876

1211

877

1212

Classes inheriting from this can use the dbus_annotations

878

1213

decorator to add annotations to methods or signals.

879

1214

"""

880

1215

881

1216

@staticmethod

882

1217

def _is_dbus_thing(thing):

883

1218

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

884

1219

885

1220

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

886

1221

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

887

1222

"""

888

1223

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

889

1224

False)

890

1225

891

1226

def _get_all_dbus_things(self, thing):

892

1227

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

893

1228

"""

896

1231

for cls in self.__class__.__mro__

897

1232

for name, athing in

898

1233

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

899

1234

900

1235

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

901

out_signature = "s",

902

path_keyword = 'object_path',

903

connection_keyword = 'connection')

1236

out_signature="s",

1237

path_keyword='object_path',

1238

connection_keyword='connection')

904

1239

def Introspect(self, object_path, connection):

905

1240

"""Overloading of standard D-Bus method.

906

1241

907

1242

Inserts annotation tags on methods and signals.

908

1243

"""

909

1244

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

910

1245

connection)

911

1246

try:

912

1247

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

913

1248

914

1249

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

915

1250

# Add annotation tags

916

1251

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

943

1278

if_tag.appendChild(ann_tag)

944

1279

# Fix argument name for the Introspect method itself

945

1280

if (if_tag.getAttribute("name")

946

== dbus.INTROSPECTABLE_IFACE):

1281

== dbus.INTROSPECTABLE_IFACE):

947

1282

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

948

1283

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

949

1284

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

962

1297

963

1298

class DBusObjectWithProperties(DBusObjectWithAnnotations):

964

1299

"""A D-Bus object with properties.

965

1300

966

1301

Classes inheriting from this can use the dbus_service_property

967

1302

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

968

1303

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

969

1304

"""

970

1305

971

1306

def _get_dbus_property(self, interface_name, property_name):

972

1307

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

973

1308

property with the specified name and interface.

978

1313

if (value._dbus_name == property_name

979

1314

and value._dbus_interface == interface_name):

980

1315

return value.__get__(self)

981

1316

982

1317

# No such property

983

1318

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

984

1319

self.dbus_object_path, interface_name, property_name))

985

1320

986

1321

@classmethod

987

1322

def _get_all_interface_names(cls):

988

1323

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

991

1326

for x in (inspect.getmro(cls))

992

1327

for attr in dir(x))

993

1328

if name is not None)

994

1329

995

1330

@dbus.service.method(dbus.PROPERTIES_IFACE,

996

1331

in_signature="ss",

997

1332

out_signature="v")

1005

1340

if not hasattr(value, "variant_level"):

1006

1341

return value

1007

1342

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

1008

1343

1009

1344

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

1010

1345

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

1011

1346

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

1023

1358

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

1024

1359

for byte in value))

1025

1360

prop(value)

1026

1361

1027

1362

@dbus.service.method(dbus.PROPERTIES_IFACE,

1028

1363

in_signature="s",

1029

1364

out_signature="a{sv}")

1030

1365

def GetAll(self, interface_name):

1031

1366

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

1032

1367

standard.

1033

1368

1034

1369

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

1035

1370

"""

1036

1371

properties = {}

1047

1382

properties[name] = value

1048

1383

continue

1049

1384

properties[name] = type(value)(

1050

value, variant_level = value.variant_level + 1)

1385

value, variant_level=value.variant_level + 1)

1051

1386

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

1052

1387

1053

1388

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

1054

1389

def PropertiesChanged(self, interface_name, changed_properties,

1055

1390

invalidated_properties):

1057

1392

standard.

1058

1393

"""

1059

1394

pass

1060

1395

1061

1396

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1062

1397

out_signature="s",

1063

1398

path_keyword='object_path',

1064

1399

connection_keyword='connection')

1065

1400

def Introspect(self, object_path, connection):

1066

1401

"""Overloading of standard D-Bus method.

1067

1402

1068

1403

Inserts property tags and interface annotation tags.

1069

1404

"""

1070

1405

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1072

1407

connection)

1073

1408

try:

1074

1409

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

1075

1410

1076

1411

def make_tag(document, name, prop):

1077

1412

e = document.createElement("property")

1078

1413

e.setAttribute("name", name)

1079

1414

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

1080

1415

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

1081

1416

return e

1082

1417

1083

1418

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

1084

1419

# Add property tags

1085

1420

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

1127

1462

exc_info=error)

1128

1463

return xmlstring

1129

1464

1465

1130

1466

try:

1131

1467

dbus.OBJECT_MANAGER_IFACE

1132

1468

except AttributeError:

1133

1469

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

1134

1470

1471

1135

1472

class DBusObjectWithObjectManager(DBusObjectWithAnnotations):

1136

1473

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

1137

1474

1138

1475

Classes inheriting from this exposes the standard

1139

1476

GetManagedObjects call and the InterfacesAdded and

1140

1477

InterfacesRemoved signals on the standard

1141

1478

"org.freedesktop.DBus.ObjectManager" interface.

1142

1479

1143

1480

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

1144

1481

manually.

1145

1482

"""

1146

1483

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

1147

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

1484

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

1148

1485

def GetManagedObjects(self):

1149

1486

"""This function must be overridden"""

1150

1487

raise NotImplementedError()

1151

1488

1152

1489

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,

1153

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

1490

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

1154

1491

def InterfacesAdded(self, object_path, interfaces_and_properties):

1155

1492

pass

1156

1157

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

1493

1494

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

1158

1495

def InterfacesRemoved(self, object_path, interfaces):

1159

1496

pass

1160

1497

1161

1498

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1162

out_signature = "s",

1163

path_keyword = 'object_path',

1164

connection_keyword = 'connection')

1499

out_signature="s",

1500

path_keyword='object_path',

1501

connection_keyword='connection')

1165

1502

def Introspect(self, object_path, connection):

1166

1503

"""Overloading of standard D-Bus method.

1167

1504

1168

1505

Override return argument name of GetManagedObjects to be

1169

1506

"objpath_interfaces_and_properties"

1170

1507

"""

1173

1510

connection)

1174

1511

try:

1175

1512

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

1176

1513

1177

1514

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

1178

1515

# Fix argument name for the GetManagedObjects method

1179

1516

if (if_tag.getAttribute("name")

1180

== dbus.OBJECT_MANAGER_IFACE):

1517

== dbus.OBJECT_MANAGER_IFACE):

1181

1518

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

1182

1519

if (cn.getAttribute("name")

1183

1520

== "GetManagedObjects"):

1193

1530

except (AttributeError, xml.dom.DOMException,

1194

1531

xml.parsers.expat.ExpatError) as error:

1195

1532

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

1196

exc_info = error)

1533

exc_info=error)

1197

1534

return xmlstring

1198

1535

1536

1199

1537

def datetime_to_dbus(dt, variant_level=0):

1200

1538

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

1201

1539

if dt is None:

1202

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

1540

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

1203

1541

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

1204

1542

1205

1543

1208

1546

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

1209

1547

interface names according to the "alt_interface_names" mapping.

1210

1548

Usage:

1211

1549

1212

1550

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

1213

1551

"net.example.AlternateInterface"})

1214

1552

class SampleDBusObject(dbus.service.Object):

1215

1553

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

1216

1554

def SampleDBusMethod():

1217

1555

pass

1218

1556

1219

1557

The above "SampleDBusMethod" on "SampleDBusObject" will be

1220

1558

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

1221

1559

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

1222

1560

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

1223

1561

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

1224

1562

1225

1563

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

1226

1564

(from DBusObjectWithProperties) and interfaces (from the

1227

1565

dbus_interface_annotations decorator).

1228

1566

"""

1229

1567

1230

1568

def wrapper(cls):

1231

1569

for orig_interface_name, alt_interface_name in (

1232

1570

alt_interface_names.items()):

1247

1585

interface_names.add(alt_interface)

1248

1586

# Is this a D-Bus signal?

1249

1587

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

1588

# Extract the original non-method undecorated

1589

# function by black magic

1250

1590

if sys.version_info.major == 2:

1251

# Extract the original non-method undecorated

1252

# function by black magic

1253

1591

nonmethod_func = (dict(

1254

1592

zip(attribute.func_code.co_freevars,

1255

1593

attribute.__closure__))

1256

1594

["func"].cell_contents)

1257

1595

else:

1258

nonmethod_func = attribute

1596

nonmethod_func = (dict(

1597

zip(attribute.__code__.co_freevars,

1598

attribute.__closure__))

1599

["func"].cell_contents)

1259

1600

# Create a new, but exactly alike, function

1260

1601

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

1261

1602

# with the alternate D-Bus interface name

1262

if sys.version_info.major == 2:

1263

new_function = types.FunctionType(

1264

nonmethod_func.func_code,

1265

nonmethod_func.func_globals,

1266

nonmethod_func.func_name,

1267

nonmethod_func.func_defaults,

1268

nonmethod_func.func_closure)

1269

else:

1270

new_function = types.FunctionType(

1271

nonmethod_func.__code__,

1272

nonmethod_func.__globals__,

1273

nonmethod_func.__name__,

1274

nonmethod_func.__defaults__,

1275

nonmethod_func.__closure__)

1603

new_function = copy_function(nonmethod_func)

1276

1604

new_function = (dbus.service.signal(

1277

1605

alt_interface,

1278

1606

attribute._dbus_signature)(new_function))

1282

1610

attribute._dbus_annotations)

1283

1611

except AttributeError:

1284

1612

pass

1613

1285

1614

# Define a creator of a function to call both the

1286

1615

# original and alternate functions, so both the

1287

1616

# original and alternate signals gets sent when

1290

1619

"""This function is a scope container to pass

1291

1620

func1 and func2 to the "call_both" function

1292

1621

outside of its arguments"""

1293

1622

1294

1623

@functools.wraps(func2)

1295

1624

def call_both(*args, **kwargs):

1296

1625

"""This function will emit two D-Bus

1297

1626

signals by calling func1 and func2"""

1298

1627

func1(*args, **kwargs)

1299

1628

func2(*args, **kwargs)

1300

# Make wrapper function look like a D-Bus signal

1629

# Make wrapper function look like a D-Bus

1630

# signal

1301

1631

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

1302

1632

if name.startswith("_dbus_"):

1303

1633

setattr(call_both, name, attr)

1304

1634

1305

1635

return call_both

1306

1636

# Create the "call_both" function and add it to

1307

1637

# the class

1317

1647

alt_interface,

1318

1648

attribute._dbus_in_signature,

1319

1649

attribute._dbus_out_signature)

1320

(types.FunctionType(attribute.func_code,

1321

attribute.func_globals,

1322

attribute.func_name,

1323

attribute.func_defaults,

1324

attribute.func_closure)))

1650

(copy_function(attribute)))

1325

1651

# Copy annotations, if any

1326

1652

try:

1327

1653

attr[attrname]._dbus_annotations = dict(

1339

1665

attribute._dbus_access,

1340

1666

attribute._dbus_get_args_options

1341

1667

["byte_arrays"])

1342

(types.FunctionType(

1343

attribute.func_code,

1344

attribute.func_globals,

1345

attribute.func_name,

1346

attribute.func_defaults,

1347

attribute.func_closure)))

1668

(copy_function(attribute)))

1348

1669

# Copy annotations, if any

1349

1670

try:

1350

1671

attr[attrname]._dbus_annotations = dict(

1359

1680

# to the class.

1360

1681

attr[attrname] = (

1361

1682

dbus_interface_annotations(alt_interface)

1362

(types.FunctionType(attribute.func_code,

1363

attribute.func_globals,

1364

attribute.func_name,

1365

attribute.func_defaults,

1366

attribute.func_closure)))

1683

(copy_function(attribute)))

1367

1684

if deprecate:

1368

1685

# Deprecate all alternate interfaces

1369

iname="_AlternateDBusNames_interface_annotation{}"

1686

iname = "_AlternateDBusNames_interface_annotation{}"

1370

1687

for interface_name in interface_names:

1371

1688

1372

1689

@dbus_interface_annotations(interface_name)

1373

1690

def func(self):

1374

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

1375

"true" }

1691

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

1692

"true"}

1376

1693

# Find an unused name

1377

1694

for aname in (iname.format(i)

1378

1695

for i in itertools.count()):

1382

1699

if interface_names:

1383

1700

# Replace the class with a new subclass of it with

1384

1701

# methods, signals, etc. as created above.

1385

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

1386

(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)

1387

1708

return cls

1388

1709

1389

1710

return wrapper

1390

1711

1391

1712

1393

1714

"se.bsnet.fukt.Mandos"})

1394

1715

class ClientDBus(Client, DBusObjectWithProperties):

1395

1716

"""A Client class using D-Bus

1396

1717

1397

1718

Attributes:

1398

1719

dbus_object_path: dbus.ObjectPath

1399

1720

bus: dbus.SystemBus()

1400

1721

"""

1401

1722

1402

1723

runtime_expansions = (Client.runtime_expansions

1403

1724

+ ("dbus_object_path", ))

1404

1725

1405

1726

_interface = "se.recompile.Mandos.Client"

1406

1727

1407

1728

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

1408

1409

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

1729

1730

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

1410

1731

self.bus = bus

1411

1732

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

1412

1733

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

1418

1739

"/clients/" + client_object_name)

1419

1740

DBusObjectWithProperties.__init__(self, self.bus,

1420

1741

self.dbus_object_path)

1421

1742

1422

1743

def notifychangeproperty(transform_func, dbus_name,

1423

1744

type_func=lambda x: x,

1424

1745

variant_level=1,

1426

1747

_interface=_interface):

1427

1748

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

1428

1749

its changes to DBus.

1429

1750

1430

1751

transform_fun: Function that takes a value and a variant_level

1431

1752

and transforms it to a D-Bus type.

1432

1753

dbus_name: D-Bus name of the variable

1435

1756

variant_level: D-Bus variant level. Default: 1

1436

1757

"""

1437

1758

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

1438

1759

1439

1760

def setter(self, value):

1440

1761

if hasattr(self, "dbus_object_path"):

1441

1762

if (not hasattr(self, attrname) or

1448

1769

else:

1449

1770

dbus_value = transform_func(

1450

1771

type_func(value),

1451

variant_level = variant_level)

1772

variant_level=variant_level)

1452

1773

self.PropertyChanged(dbus.String(dbus_name),

1453

1774

dbus_value)

1454

1775

self.PropertiesChanged(

1455

1776

_interface,

1456

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

1457

dbus_value }),

1777

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

1778

dbus_value}),

1458

1779

dbus.Array())

1459

1780

setattr(self, attrname, value)

1460

1781

1461

1782

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

1462

1783

1463

1784

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1464

1785

approvals_pending = notifychangeproperty(dbus.Boolean,

1465

1786

"ApprovalPending",

1466

type_func = bool)

1787

type_func=bool)

1467

1788

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

1468

1789

last_enabled = notifychangeproperty(datetime_to_dbus,

1469

1790

"LastEnabled")

1470

1791

checker = notifychangeproperty(

1471

1792

dbus.Boolean, "CheckerRunning",

1472

type_func = lambda checker: checker is not None)

1793

type_func=lambda checker: checker is not None)

1473

1794

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1474

1795

"LastCheckedOK")

1475

1796

last_checker_status = notifychangeproperty(dbus.Int16,

1480

1801

"ApprovedByDefault")

1481

1802

approval_delay = notifychangeproperty(

1482

1803

dbus.UInt64, "ApprovalDelay",

1483

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

1804

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

1484

1805

approval_duration = notifychangeproperty(

1485

1806

dbus.UInt64, "ApprovalDuration",

1486

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

1807

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

1487

1808

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

1488

1809

timeout = notifychangeproperty(

1489

1810

dbus.UInt64, "Timeout",

1490

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

1811

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

1491

1812

extended_timeout = notifychangeproperty(

1492

1813

dbus.UInt64, "ExtendedTimeout",

1493

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

1814

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

1494

1815

interval = notifychangeproperty(

1495

1816

dbus.UInt64, "Interval",

1496

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

1817

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

1497

1818

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

1498

1819

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

1499

1820

invalidate_only=True)

1500

1821

1501

1822

del notifychangeproperty

1502

1823

1503

1824

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

1504

1825

try:

1505

1826

self.remove_from_connection()

1508

1829

if hasattr(DBusObjectWithProperties, "__del__"):

1509

1830

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

1510

1831

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

1511

1832

1512

1833

def checker_callback(self, source, condition,

1513

1834

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

1514

1835

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

1530

1851

| self.last_checker_signal),

1531

1852

dbus.String(command))

1532

1853

return ret

1533

1854

1534

1855

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

1535

1856

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

1536

1857

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

1540

1861

# Emit D-Bus signal

1541

1862

self.CheckerStarted(self.current_checker_command)

1542

1863

return r

1543

1864

1544

1865

def _reset_approved(self):

1545

1866

self.approved = None

1546

1867

return False

1547

1868

1548

1869

def approve(self, value=True):

1549

1870

self.approved = value

1550

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

1551

* 1000), self._reset_approved)

1871

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

1872

* 1000), self._reset_approved)

1552

1873

self.send_changedstate()

1553

1554

## D-Bus methods, signals & properties

1555

1556

## Interfaces

1557

1558

## Signals

1559

1874

1875

# D-Bus methods, signals & properties

1876

1877

# Interfaces

1878

1879

# Signals

1880

1560

1881

# CheckerCompleted - signal

1561

1882

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

1562

1883

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

1563

1884

"D-Bus signal"

1564

1885

pass

1565

1886

1566

1887

# CheckerStarted - signal

1567

1888

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

1568

1889

def CheckerStarted(self, command):

1569

1890

"D-Bus signal"

1570

1891

pass

1571

1892

1572

1893

# PropertyChanged - signal

1573

1894

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

1574

1895

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

1575

1896

def PropertyChanged(self, property, value):

1576

1897

"D-Bus signal"

1577

1898

pass

1578

1899

1579

1900

# GotSecret - signal

1580

1901

@dbus.service.signal(_interface)

1581

1902

def GotSecret(self):

1584

1905

server to mandos-client

1585

1906

"""

1586

1907

pass

1587

1908

1588

1909

# Rejected - signal

1589

1910

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

1590

1911

def Rejected(self, reason):

1591

1912

"D-Bus signal"

1592

1913

pass

1593

1914

1594

1915

# NeedApproval - signal

1595

1916

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

1596

1917

def NeedApproval(self, timeout, default):

1597

1918

"D-Bus signal"

1598

1919

return self.need_approval()

1599

1600

## Methods

1601

1920

1921

# Methods

1922

1602

1923

# Approve - method

1603

1924

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

1604

1925

def Approve(self, value):

1605

1926

self.approve(value)

1606

1927

1607

1928

# CheckedOK - method

1608

1929

@dbus.service.method(_interface)

1609

1930

def CheckedOK(self):

1610

1931

self.checked_ok()

1611

1932

1612

1933

# Enable - method

1613

1934

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

1614

1935

@dbus.service.method(_interface)

1615

1936

def Enable(self):

1616

1937

"D-Bus method"

1617

1938

self.enable()

1618

1939

1619

1940

# StartChecker - method

1620

1941

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

1621

1942

@dbus.service.method(_interface)

1622

1943

def StartChecker(self):

1623

1944

"D-Bus method"

1624

1945

self.start_checker()

1625

1946

1626

1947

# Disable - method

1627

1948

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

1628

1949

@dbus.service.method(_interface)

1629

1950

def Disable(self):

1630

1951

"D-Bus method"

1631

1952

self.disable()

1632

1953

1633

1954

# StopChecker - method

1634

1955

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

1635

1956

@dbus.service.method(_interface)

1636

1957

def StopChecker(self):

1637

1958

self.stop_checker()

1638

1639

## Properties

1640

1959

1960

# Properties

1961

1641

1962

# ApprovalPending - property

1642

1963

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

1643

1964

def ApprovalPending_dbus_property(self):

1644

1965

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

1645

1966

1646

1967

# ApprovedByDefault - property

1647

1968

@dbus_service_property(_interface,

1648

1969

signature="b",

1651

1972

if value is None: # get

1652

1973

return dbus.Boolean(self.approved_by_default)

1653

1974

self.approved_by_default = bool(value)

1654

1975

1655

1976

# ApprovalDelay - property

1656

1977

@dbus_service_property(_interface,

1657

1978

signature="t",

1661

1982

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

1662

1983

* 1000)

1663

1984

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

1664

1985

1665

1986

# ApprovalDuration - property

1666

1987

@dbus_service_property(_interface,

1667

1988

signature="t",

1671

1992

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

1672

1993

* 1000)

1673

1994

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

1674

1995

1675

1996

# Name - property

1676

1997

@dbus_annotations(

1677

1998

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

1678

1999

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

1679

2000

def Name_dbus_property(self):

1680

2001

return dbus.String(self.name)

1681

2002

1682

2003

# Fingerprint - property

1683

2004

@dbus_annotations(

1684

2005

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

1685

2006

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

1686

2007

def Fingerprint_dbus_property(self):

1687

2008

return dbus.String(self.fingerprint)

1688

2009

1689

2010

# Host - property

1690

2011

@dbus_service_property(_interface,

1691

2012

signature="s",

1694

2015

if value is None: # get

1695

2016

return dbus.String(self.host)

1696

2017

self.host = str(value)

1697

2018

1698

2019

# Created - property

1699

2020

@dbus_annotations(

1700

2021

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

1701

2022

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

1702

2023

def Created_dbus_property(self):

1703

2024

return datetime_to_dbus(self.created)

1704

2025

1705

2026

# LastEnabled - property

1706

2027

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

1707

2028

def LastEnabled_dbus_property(self):

1708

2029

return datetime_to_dbus(self.last_enabled)

1709

2030

1710

2031

# Enabled - property

1711

2032

@dbus_service_property(_interface,

1712

2033

signature="b",

1718

2039

self.enable()

1719

2040

else:

1720

2041

self.disable()

1721

2042

1722

2043

# LastCheckedOK - property

1723

2044

@dbus_service_property(_interface,

1724

2045

signature="s",

1728

2049

self.checked_ok()

1729

2050

return

1730

2051

return datetime_to_dbus(self.last_checked_ok)

1731

2052

1732

2053

# LastCheckerStatus - property

1733

2054

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

1734

2055

def LastCheckerStatus_dbus_property(self):

1735

2056

return dbus.Int16(self.last_checker_status)

1736

2057

1737

2058

# Expires - property

1738

2059

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

1739

2060

def Expires_dbus_property(self):

1740

2061

return datetime_to_dbus(self.expires)

1741

2062

1742

2063

# LastApprovalRequest - property

1743

2064

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

1744

2065

def LastApprovalRequest_dbus_property(self):

1745

2066

return datetime_to_dbus(self.last_approval_request)

1746

2067

1747

2068

# Timeout - property

1748

2069

@dbus_service_property(_interface,

1749

2070

signature="t",

1764

2085

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

1765

2086

is None):

1766

2087

return

1767

gobject.source_remove(self.disable_initiator_tag)

1768

self.disable_initiator_tag = gobject.timeout_add(

2088

GLib.source_remove(self.disable_initiator_tag)

2089

self.disable_initiator_tag = GLib.timeout_add(

1769

2090

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

1770

2091

self.disable)

1771

2092

1772

2093

# ExtendedTimeout - property

1773

2094

@dbus_service_property(_interface,

1774

2095

signature="t",

1778

2099

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

1779

2100

* 1000)

1780

2101

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

1781

2102

1782

2103

# Interval - property

1783

2104

@dbus_service_property(_interface,

1784

2105

signature="t",

1791

2112

return

1792

2113

if self.enabled:

1793

2114

# Reschedule checker run

1794

gobject.source_remove(self.checker_initiator_tag)

1795

self.checker_initiator_tag = gobject.timeout_add(

2115

GLib.source_remove(self.checker_initiator_tag)

2116

self.checker_initiator_tag = GLib.timeout_add(

1796

2117

value, self.start_checker)

1797

self.start_checker() # Start one now, too

1798

2118

self.start_checker() # Start one now, too

2119

1799

2120

# Checker - property

1800

2121

@dbus_service_property(_interface,

1801

2122

signature="s",

1804

2125

if value is None: # get

1805

2126

return dbus.String(self.checker_command)

1806

2127

self.checker_command = str(value)

1807

2128

1808

2129

# CheckerRunning - property

1809

2130

@dbus_service_property(_interface,

1810

2131

signature="b",

1816

2137

self.start_checker()

1817

2138

else:

1818

2139

self.stop_checker()

1819

2140

1820

2141

# ObjectPath - property

1821

2142

@dbus_annotations(

1822

2143

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

1823

2144

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

1824

2145

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

1825

2146

def ObjectPath_dbus_property(self):

1826

return self.dbus_object_path # is already a dbus.ObjectPath

1827

2147

return self.dbus_object_path # is already a dbus.ObjectPath

2148

1828

2149

# Secret = property

1829

2150

@dbus_annotations(

1830

2151

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

1835

2156

byte_arrays=True)

1836

2157

def Secret_dbus_property(self, value):

1837

2158

self.secret = bytes(value)

1838

2159

1839

2160

del _interface

1840

2161

1841

2162

1845

2166

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

1846

2167

if not self._pipe.recv():

1847

2168

raise KeyError(fpr)

1848

2169

1849

2170

def __getattribute__(self, name):

1850

2171

if name == '_pipe':

1851

2172

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

1854

2175

if data[0] == 'data':

1855

2176

return data[1]

1856

2177

if data[0] == 'function':

1857

2178

1858

2179

def func(*args, **kwargs):

1859

2180

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

1860

2181

return self._pipe.recv()[1]

1861

2182

1862

2183

return func

1863

2184

1864

2185

def __setattr__(self, name, value):

1865

2186

if name == '_pipe':

1866

2187

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

1869

2190

1870

2191

class ClientHandler(socketserver.BaseRequestHandler, object):

1871

2192

"""A class to handle client connections.

1872

2193

1873

2194

Instantiated once for each connection to handle it.

1874

2195

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

1875

2196

1876

2197

def handle(self):

1877

2198

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

1878

2199

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

1879

2200

str(self.client_address))

1880

2201

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

1881

2202

self.server.child_pipe.fileno())

1882

1883

session = gnutls.connection.ClientSession(

1884

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

1885

1886

# Note: gnutls.connection.X509Credentials is really a

1887

# generic GnuTLS certificate credentials object so long as

1888

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

1889

# here despite using OpenPGP certificates.

1890

1891

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

1892

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

1893

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

1894

# "+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"))

1895

2210

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

1896

2211

priority = self.server.gnutls_priority

1897

2212

if priority is None:

1898

2213

priority = "NORMAL"

1899

gnutls.library.functions.gnutls_priority_set_direct(

1900

session._c_object, priority, None)

1901

2214

gnutls.priority_set_direct(session._c_object,

2215

priority.encode("utf-8"),

2216

None)

2217

1902

2218

# Start communication using the Mandos protocol

1903

2219

# Get protocol number

1904

2220

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

1909

2225

except (ValueError, IndexError, RuntimeError) as error:

1910

2226

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

1911

2227

return

1912

2228

1913

2229

# Start GnuTLS connection

1914

2230

try:

1915

2231

session.handshake()

1916

except gnutls.errors.GNUTLSError as error:

2232

except gnutls.Error as error:

1917

2233

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

1918

2234

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

1919

2235

# established. Just abandon the request.

1920

2236

return

1921

2237

logger.debug("Handshake succeeded")

1922

2238

1923

2239

approval_required = False

1924

2240

try:

1925

2241

try:

1926

2242

fpr = self.fingerprint(

1927

2243

self.peer_certificate(session))

1928

except (TypeError,

1929

gnutls.errors.GNUTLSError) as error:

2244

except (TypeError, gnutls.Error) as error:

1930

2245

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

1931

2246

return

1932

2247

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

1933

2248

1934

2249

try:

1935

2250

client = ProxyClient(child_pipe, fpr,

1936

2251

self.client_address)

1937

2252

except KeyError:

1938

2253

return

1939

2254

1940

2255

if client.approval_delay:

1941

2256

delay = client.approval_delay

1942

2257

client.approvals_pending += 1

1943

2258

approval_required = True

1944

2259

1945

2260

while True:

1946

2261

if not client.enabled:

1947

2262

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

1950

2265

# Emit D-Bus signal

1951

2266

client.Rejected("Disabled")

1952

2267

return

1953

2268

1954

2269

if client.approved or not client.approval_delay:

1955

#We are approved or approval is disabled

2270

# We are approved or approval is disabled

1956

2271

break

1957

2272

elif client.approved is None:

1958

2273

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

1969

2284

# Emit D-Bus signal

1970

2285

client.Rejected("Denied")

1971

2286

return

1972

1973

#wait until timeout or approved

2287

2288

# wait until timeout or approved

1974

2289

time = datetime.datetime.now()

1975

2290

client.changedstate.acquire()

1976

2291

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

1989

2304

break

1990

2305

else:

1991

2306

delay -= time2 - time

1992

1993

sent_size = 0

1994

while sent_size < len(client.secret):

1995

try:

1996

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

1997

except gnutls.errors.GNUTLSError as error:

1998

logger.warning("gnutls send failed",

1999

exc_info=error)

2000

return

2001

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

2002

len(client.secret) - (sent_size

2003

+ sent))

2004

sent_size += sent

2005

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

2006

2315

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

2007

2316

# bump the timeout using extended_timeout

2008

2317

client.bump_timeout(client.extended_timeout)

2009

2318

if self.server.use_dbus:

2010

2319

# Emit D-Bus signal

2011

2320

client.GotSecret()

2012

2321

2013

2322

finally:

2014

2323

if approval_required:

2015

2324

client.approvals_pending -= 1

2016

2325

try:

2017

2326

session.bye()

2018

except gnutls.errors.GNUTLSError as error:

2327

except gnutls.Error as error:

2019

2328

logger.warning("GnuTLS bye failed",

2020

2329

exc_info=error)

2021

2330

2022

2331

@staticmethod

2023

2332

def peer_certificate(session):

2024

2333

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

2025

2334

# If not an OpenPGP certificate...

2026

if (gnutls.library.functions.gnutls_certificate_type_get(

2027

session._c_object)

2028

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

2029

# ...do the normal thing

2030

return session.peer_certificate

2335

if (gnutls.certificate_type_get(session._c_object)

2336

!= gnutls.CRT_OPENPGP):

2337

# ...return invalid data

2338

return b""

2031

2339

list_size = ctypes.c_uint(1)

2032

cert_list = (gnutls.library.functions

2033

.gnutls_certificate_get_peers

2340

cert_list = (gnutls.certificate_get_peers

2034

2341

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

2035

2342

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

2036

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

2037

" certificate")

2343

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

2038

2344

if list_size.value == 0:

2039

2345

return None

2040

2346

cert = cert_list[0]

2041

2347

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

2042

2348

2043

2349

@staticmethod

2044

2350

def fingerprint(openpgp):

2045

2351

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

2046

2352

# New GnuTLS "datum" with the OpenPGP public key

2047

datum = gnutls.library.types.gnutls_datum_t(

2353

datum = gnutls.datum_t(

2048

2354

ctypes.cast(ctypes.c_char_p(openpgp),

2049

2355

ctypes.POINTER(ctypes.c_ubyte)),

2050

2356

ctypes.c_uint(len(openpgp)))

2051

2357

# New empty GnuTLS certificate

2052

crt = gnutls.library.types.gnutls_openpgp_crt_t()

2053

gnutls.library.functions.gnutls_openpgp_crt_init(

2054

ctypes.byref(crt))

2358

crt = gnutls.openpgp_crt_t()

2359

gnutls.openpgp_crt_init(ctypes.byref(crt))

2055

2360

# Import the OpenPGP public key into the certificate

2056

gnutls.library.functions.gnutls_openpgp_crt_import(

2057

crt, ctypes.byref(datum),

2058

gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)

2361

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

2362

gnutls.OPENPGP_FMT_RAW)

2059

2363

# Verify the self signature in the key

2060

2364

crtverify = ctypes.c_uint()

2061

gnutls.library.functions.gnutls_openpgp_crt_verify_self(

2062

crt, 0, ctypes.byref(crtverify))

2365

gnutls.openpgp_crt_verify_self(crt, 0,

2366

ctypes.byref(crtverify))

2063

2367

if crtverify.value != 0:

2064

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2065

raise gnutls.errors.CertificateSecurityError(

2066

"Verify failed")

2368

gnutls.openpgp_crt_deinit(crt)

2369

raise gnutls.CertificateSecurityError("Verify failed")

2067

2370

# New buffer for the fingerprint

2068

2371

buf = ctypes.create_string_buffer(20)

2069

2372

buf_len = ctypes.c_size_t()

2070

2373

# Get the fingerprint from the certificate into the buffer

2071

gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint(

2072

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

2374

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

2375

ctypes.byref(buf_len))

2073

2376

# Deinit the certificate

2074

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2377

gnutls.openpgp_crt_deinit(crt)

2075

2378

# Convert the buffer to a Python bytestring

2076

2379

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

2077

2380

# Convert the bytestring to hexadecimal notation

2081

2384

2082

2385

class MultiprocessingMixIn(object):

2083

2386

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

2084

2387

2085

2388

def sub_process_main(self, request, address):

2086

2389

try:

2087

2390

self.finish_request(request, address)

2088

2391

except Exception:

2089

2392

self.handle_error(request, address)

2090

2393

self.close_request(request)

2091

2394

2092

2395

def process_request(self, request, address):

2093

2396

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

2094

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

2095

args = (request, address))

2397

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

2398

args=(request, address))

2096

2399

proc.start()

2097

2400

return proc

2098

2401

2099

2402

2100

2403

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

2101

2404

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

2102

2405

2103

2406

def process_request(self, request, client_address):

2104

2407

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

2105

2408

2106

2409

This function creates a new pipe in self.pipe

2107

2410

"""

2108

2411

parent_pipe, self.child_pipe = multiprocessing.Pipe()

2109

2412

2110

2413

proc = MultiprocessingMixIn.process_request(self, request,

2111

2414

client_address)

2112

2415

self.child_pipe.close()

2113

2416

self.add_pipe(parent_pipe, proc)

2114

2417

2115

2418

def add_pipe(self, parent_pipe, proc):

2116

2419

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

2117

2420

raise NotImplementedError()

2120

2423

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

2121

2424

socketserver.TCPServer, object):

2122

2425

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

2123

2426

2124

2427

Attributes:

2125

2428

enabled: Boolean; whether this server is activated yet

2126

2429

interface: None or a network interface name (string)

2127

2430

use_ipv6: Boolean; to use IPv6 or not

2128

2431

"""

2129

2432

2130

2433

def __init__(self, server_address, RequestHandlerClass,

2131

2434

interface=None,

2132

2435

use_ipv6=True,

2142

2445

self.socketfd = socketfd

2143

2446

# Save the original socket.socket() function

2144

2447

self.socket_socket = socket.socket

2448

2145

2449

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

2146

#

2450

#

2147

2451

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

2148

2452

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

2149

2453

# patching socket.socket.)

2150

#

2454

#

2151

2455

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

2152

2456

@functools.wraps(socket.socket)

2153

2457

def socket_wrapper(*args, **kwargs):

2165

2469

# socket_wrapper(), if socketfd was set.

2166

2470

socketserver.TCPServer.__init__(self, server_address,

2167

2471

RequestHandlerClass)

2168

2472

2169

2473

def server_bind(self):

2170

2474

"""This overrides the normal server_bind() function

2171

2475

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

2172

2476

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

2477

global SO_BINDTODEVICE

2173

2478

if self.interface is not None:

2174

2479

if SO_BINDTODEVICE is None:

2175

logger.error("SO_BINDTODEVICE does not exist;"

2176

" cannot bind to interface %s",

2177

self.interface)

2178

else:

2179

try:

2180

self.socket.setsockopt(

2181

socket.SOL_SOCKET, SO_BINDTODEVICE,

2182

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

2183

except socket.error as error:

2184

if error.errno == errno.EPERM:

2185

logger.error("No permission to bind to"

2186

" interface %s", self.interface)

2187

elif error.errno == errno.ENOPROTOOPT:

2188

logger.error("SO_BINDTODEVICE not available;"

2189

" cannot bind to interface %s",

2190

self.interface)

2191

elif error.errno == errno.ENODEV:

2192

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

2193

" cannot bind", self.interface)

2194

else:

2195

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

2196

2501

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

2197

2502

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

2198

2503

if not self.server_address[0]:

2199

2504

if self.address_family == socket.AF_INET6:

2200

any_address = "::" # in6addr_any

2505

any_address = "::" # in6addr_any

2201

2506

else:

2202

any_address = "0.0.0.0" # INADDR_ANY

2507

any_address = "0.0.0.0" # INADDR_ANY

2203

2508

self.server_address = (any_address,

2204

2509

self.server_address[1])

2205

2510

elif not self.server_address[1]:

2215

2520

2216

2521

class MandosServer(IPv6_TCPServer):

2217

2522

"""Mandos server.

2218

2523

2219

2524

Attributes:

2220

2525

clients: set of Client objects

2221

2526

gnutls_priority GnuTLS priority string

2222

2527

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

2223

2224

Assumes a gobject.MainLoop event loop.

2528

2529

Assumes a GLib.MainLoop event loop.

2225

2530

"""

2226

2531

2227

2532

def __init__(self, server_address, RequestHandlerClass,

2228

2533

interface=None,

2229

2534

use_ipv6=True,

2239

2544

self.gnutls_priority = gnutls_priority

2240

2545

IPv6_TCPServer.__init__(self, server_address,

2241

2546

RequestHandlerClass,

2242

interface = interface,

2243

use_ipv6 = use_ipv6,

2244

socketfd = socketfd)

2245

2547

interface=interface,

2548

use_ipv6=use_ipv6,

2549

socketfd=socketfd)

2550

2246

2551

def server_activate(self):

2247

2552

if self.enabled:

2248

2553

return socketserver.TCPServer.server_activate(self)

2249

2554

2250

2555

def enable(self):

2251

2556

self.enabled = True

2252

2557

2253

2558

def add_pipe(self, parent_pipe, proc):

2254

2559

# Call "handle_ipc" for both data and EOF events

2255

gobject.io_add_watch(

2560

GLib.io_add_watch(

2256

2561

parent_pipe.fileno(),

2257

gobject.IO_IN | gobject.IO_HUP,

2562

GLib.IO_IN | GLib.IO_HUP,

2258

2563

functools.partial(self.handle_ipc,

2259

parent_pipe = parent_pipe,

2260

proc = proc))

2261

2564

parent_pipe=parent_pipe,

2565

proc=proc))

2566

2262

2567

def handle_ipc(self, source, condition,

2263

2568

parent_pipe=None,

2264

proc = None,

2569

proc=None,

2265

2570

client_object=None):

2266

2571

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

2267

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

2572

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

2268

2573

# Wait for other process to exit

2269

2574

proc.join()

2270

2575

return False

2271

2576

2272

2577

# Read a request from the child

2273

2578

request = parent_pipe.recv()

2274

2579

command = request[0]

2275

2580

2276

2581

if command == 'init':

2277

fpr = request[1]

2582

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

2278

2583

address = request[2]

2279

2280

for c in self.clients.itervalues():

2584

2585

for c in self.clients.values():

2281

2586

if c.fingerprint == fpr:

2282

2587

client = c

2283

2588

break

2290

2595

address[0])

2291

2596

parent_pipe.send(False)

2292

2597

return False

2293

2294

gobject.io_add_watch(

2598

2599

GLib.io_add_watch(

2295

2600

parent_pipe.fileno(),

2296

gobject.IO_IN | gobject.IO_HUP,

2601

GLib.IO_IN | GLib.IO_HUP,

2297

2602

functools.partial(self.handle_ipc,

2298

parent_pipe = parent_pipe,

2299

proc = proc,

2300

client_object = client))

2603

parent_pipe=parent_pipe,

2604

proc=proc,

2605

client_object=client))

2301

2606

parent_pipe.send(True)

2302

2607

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

2303

2608

# same fileno

2306

2611

funcname = request[1]

2307

2612

args = request[2]

2308

2613

kwargs = request[3]

2309

2614

2310

2615

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

2311

2616

funcname)(*args,

2312

2617

**kwargs)))

2313

2618

2314

2619

if command == 'getattr':

2315

2620

attrname = request[1]

2316

2621

if isinstance(client_object.__getattribute__(attrname),

2319

2624

else:

2320

2625

parent_pipe.send((

2321

2626

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

2322

2627

2323

2628

if command == 'setattr':

2324

2629

attrname = request[1]

2325

2630

value = request[2]

2326

2631

setattr(client_object, attrname, value)

2327

2632

2328

2633

return True

2329

2634

2330

2635

2331

2636

def rfc3339_duration_to_delta(duration):

2332

2637

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

2333

2638

2334

2639

>>> rfc3339_duration_to_delta("P7D")

2335

2640

datetime.timedelta(7)

2336

2641

>>> rfc3339_duration_to_delta("PT60S")

2346

2651

>>> rfc3339_duration_to_delta("P1DT3M20S")

2347

2652

datetime.timedelta(1, 200)

2348

2653

"""

2349

2654

2350

2655

# Parsing an RFC 3339 duration with regular expressions is not

2351

2656

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

2352

2657

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

2353

2658

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

2354

2659

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

2355

2660

# avoid excessive use of external libraries.

2356

2661

2357

2662

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

2358

2663

Token = collections.namedtuple("Token", (

2359

2664

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

2392

2697

frozenset((token_year, token_month,

2393

2698

token_day, token_time,

2394

2699

token_week)))

2395

# Define starting values

2396

value = datetime.timedelta() # Value so far

2700

# Define starting values:

2701

# Value so far

2702

value = datetime.timedelta()

2397

2703

found_token = None

2398

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

2399

s = duration # String left to parse

2704

# Following valid tokens

2705

followers = frozenset((token_duration, ))

2706

# String left to parse

2707

s = duration

2400

2708

# Loop until end token is found

2401

2709

while found_token is not token_end:

2402

2710

# Search for any currently valid tokens

2426

2734

2427

2735

def string_to_delta(interval):

2428

2736

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

2429

2737

2430

2738

>>> string_to_delta('7d')

2431

2739

datetime.timedelta(7)

2432

2740

>>> string_to_delta('60s')

2440

2748

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

2441

2749

datetime.timedelta(0, 330)

2442

2750

"""

2443

2751

2444

2752

try:

2445

2753

return rfc3339_duration_to_delta(interval)

2446

2754

except ValueError:

2447

2755

pass

2448

2756

2449

2757

timevalue = datetime.timedelta(0)

2450

2758

for s in interval.split():

2451

2759

try:

2469

2777

return timevalue

2470

2778

2471

2779

2472

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

2780

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

2473

2781

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

2474

2782

2475

2783

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

2476

2784

if os.fork():

2477

2785

sys.exit()

2495

2803

2496

2804

2497

2805

def main():

2498

2806

2499

2807

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

2500

2808

# Parsing of options, both command line and config file

2501

2809

2502

2810

parser = argparse.ArgumentParser()

2503

2811

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

2504

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

2812

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

2505

2813

help="show version number and exit")

2506

2814

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

2507

2815

help="Bind to interface IF")

2543

2851

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

2544

2852

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

2545

2853

default=None)

2546

2854

2547

2855

options = parser.parse_args()

2548

2856

2549

2857

if options.check:

2550

2858

import doctest

2551

2859

fail_count, test_count = doctest.testmod()

2552

2860

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

2553

2861

2554

2862

# Default values for config file for server-global settings

2555

server_defaults = { "interface": "",

2556

"address": "",

2557

"port": "",

2558

"debug": "False",

2559

"priority":

2560

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

2561

":+SIGN-DSA-SHA256",

2562

"servicename": "Mandos",

2563

"use_dbus": "True",

2564

"use_ipv6": "True",

2565

"debuglevel": "",

2566

"restore": "True",

2567

"socket": "",

2568

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

2569

"foreground": "False",

2570

"zeroconf": "True",

2571

}

2572

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

2573

2881

# Parse config file for server-global settings

2574

2882

server_config = configparser.SafeConfigParser(server_defaults)

2575

2883

del server_defaults

2577

2885

# Convert the SafeConfigParser object to a dict

2578

2886

server_settings = server_config.defaults()

2579

2887

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

2580

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

2888

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

2889

"foreground", "zeroconf"):

2581

2890

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

2582

2891

option)

2583

2892

if server_settings["port"]:

2593

2902

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

2594

2903

["socket"])

2595

2904

del server_config

2596

2905

2597

2906

# Override the settings from the config file with command line

2598

2907

# options, if set.

2599

2908

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

2617

2926

if server_settings["debug"]:

2618

2927

server_settings["foreground"] = True

2619

2928

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

2620

2929

2621

2930

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

2622

2931

2623

2932

if (not server_settings["zeroconf"]

2624

2933

and not (server_settings["port"]

2625

2934

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

2626

2935

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

2627

2936

2628

2937

# For convenience

2629

2938

debug = server_settings["debug"]

2630

2939

debuglevel = server_settings["debuglevel"]

2634

2943

stored_state_file)

2635

2944

foreground = server_settings["foreground"]

2636

2945

zeroconf = server_settings["zeroconf"]

2637

2946

2638

2947

if debug:

2639

2948

initlogger(debug, logging.DEBUG)

2640

2949

else:

2643

2952

else:

2644

2953

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

2645

2954

initlogger(debug, level)

2646

2955

2647

2956

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

2648

2957

syslogger.setFormatter(

2649

2958

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

2650

2959

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

2651

2960

server_settings["servicename"])))

2652

2961

2653

2962

# Parse config file with clients

2654

2963

client_config = configparser.SafeConfigParser(Client

2655

2964

.client_defaults)

2656

2965

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

2657

2966

"clients.conf"))

2658

2967

2659

2968

global mandos_dbus_service

2660

2969

mandos_dbus_service = None

2661

2970

2662

2971

socketfd = None

2663

2972

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

2664

2973

socketfd = server_settings["socket"]

2680

2989

except IOError as e:

2681

2990

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

2682

2991

exc_info=e)

2683

2684

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

2992

2993

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

2994

("mandos", "mandos"),

2995

("nobody", "nogroup")):

2685

2996

try:

2686

2997

uid = pwd.getpwnam(name).pw_uid

2687

gid = pwd.getpwnam(name).pw_gid

2998

gid = pwd.getpwnam(group).pw_gid

2688

2999

break

2689

3000

except KeyError:

2690

3001

continue

2694

3005

try:

2695

3006

os.setgid(gid)

2696

3007

os.setuid(uid)

3008

if debug:

3009

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

3010

gid))

2697

3011

except OSError as error:

3012

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

3013

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

2698

3014

if error.errno != errno.EPERM:

2699

3015

raise

2700

3016

2701

3017

if debug:

2702

3018

# Enable all possible GnuTLS debugging

2703

3019

2704

3020

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

2705

3021

# - GnuTLS manual

2706

gnutls.library.functions.gnutls_global_set_log_level(11)

2707

2708

@gnutls.library.types.gnutls_log_func

3022

gnutls.global_set_log_level(11)

3023

3024

@gnutls.log_func

2709

3025

def debug_gnutls(level, string):

2710

3026

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

2711

2712

gnutls.library.functions.gnutls_global_set_log_function(

2713

debug_gnutls)

2714

3027

3028

gnutls.global_set_log_function(debug_gnutls)

3029

2715

3030

# Redirect stdin so all checkers get /dev/null

2716

3031

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

2717

3032

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

2718

3033

if null > 2:

2719

3034

os.close(null)

2720

3035

2721

3036

# Need to fork before connecting to D-Bus

2722

3037

if not foreground:

2723

3038

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

2724

3039

daemon()

2725

2726

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

2727

# need to inform gobject that threads will be used.

2728

gobject.threads_init()

2729

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

2730

3045

global main_loop

2731

3046

# From the Avahi example code

2732

3047

DBusGMainLoop(set_as_default=True)

2733

main_loop = gobject.MainLoop()

3048

main_loop = GLib.MainLoop()

2734

3049

bus = dbus.SystemBus()

2735

3050

# End of Avahi example code

2736

3051

if use_dbus:

2749

3064

if zeroconf:

2750

3065

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2751

3066

service = AvahiServiceToSyslog(

2752

name = server_settings["servicename"],

2753

servicetype = "_mandos._tcp",

2754

protocol = protocol,

2755

bus = bus)

3067

name=server_settings["servicename"],

3068

servicetype="_mandos._tcp",

3069

protocol=protocol,

3070

bus=bus)

2756

3071

if server_settings["interface"]:

2757

3072

service.interface = if_nametoindex(

2758

3073

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

2759

3074

2760

3075

global multiprocessing_manager

2761

3076

multiprocessing_manager = multiprocessing.Manager()

2762

3077

2763

3078

client_class = Client

2764

3079

if use_dbus:

2765

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

2766

3080

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

3081

2767

3082

client_settings = Client.config_parser(client_config)

2768

3083

old_client_settings = {}

2769

3084

clients_data = {}

2770

3085

2771

3086

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

2772

3087

global wnull

2773

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

3088

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

2774

3089

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

2775

3090

# mode

2776

3091

if debug or not foreground:

2777

3092

wnull.close()

2778

3093

2779

3094

# Get client data and settings from last running state.

2780

3095

if server_settings["restore"]:

2781

3096

try:

2782

3097

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

2783

clients_data, old_client_settings = pickle.load(

2784

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"))

2785

3143

os.remove(stored_state_path)

2786

3144

except IOError as e:

2787

3145

if e.errno == errno.ENOENT:

2795

3153

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

2796

3154

"EOFError:",

2797

3155

exc_info=e)

2798

3156

2799

3157

with PGPEngine() as pgp:

2800

3158

for client_name, client in clients_data.items():

2801

3159

# Skip removed clients

2802

3160

if client_name not in client_settings:

2803

3161

continue

2804

3162

2805

3163

# Decide which value to use after restoring saved state.

2806

3164

# We have three different values: Old config file,

2807

3165

# new config file, and saved state.

2818

3176

client[name] = value

2819

3177

except KeyError:

2820

3178

pass

2821

3179

2822

3180

# Clients who has passed its expire date can still be

2823

3181

# enabled if its last checker was successful. A Client

2824

3182

# whose checker succeeded before we stored its state is

2857

3215

client_name))

2858

3216

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

2859

3217

["secret"])

2860

3218

2861

3219

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

2862

3220

for client_name in (set(old_client_settings)

2863

3221

- set(client_settings)):

2865

3223

for client_name in (set(client_settings)

2866

3224

- set(old_client_settings)):

2867

3225

clients_data[client_name] = client_settings[client_name]

2868

3226

2869

3227

# Create all client objects

2870

3228

for client_name, client in clients_data.items():

2871

3229

tcp_server.clients[client_name] = client_class(

2872

name = client_name,

2873

settings = client,

2874

server_settings = server_settings)

2875

3230

name=client_name,

3231

settings=client,

3232

server_settings=server_settings)

3233

2876

3234

if not tcp_server.clients:

2877

3235

logger.warning("No clients defined")

2878

3236

2879

3237

if not foreground:

2880

3238

if pidfile is not None:

2881

3239

pid = os.getpid()

2887

3245

pidfilename, pid)

2888

3246

del pidfile

2889

3247

del pidfilename

2890

2891

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

2892

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

2893

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

2894

3253

if use_dbus:

2895

3254

2896

3255

@alternate_dbus_interfaces(

2897

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

3256

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

2898

3257

class MandosDBusService(DBusObjectWithObjectManager):

2899

3258

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

2900

3259

2901

3260

def __init__(self):

2902

3261

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

2903

3262

2904

3263

_interface = "se.recompile.Mandos"

2905

3264

2906

3265

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

2907

3266

def ClientAdded(self, objpath):

2908

3267

"D-Bus signal"

2909

3268

pass

2910

3269

2911

3270

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

2912

3271

def ClientNotFound(self, fingerprint, address):

2913

3272

"D-Bus signal"

2914

3273

pass

2915

3274

2916

3275

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

2917

3276

"true"})

2918

3277

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

2919

3278

def ClientRemoved(self, objpath, name):

2920

3279

"D-Bus signal"

2921

3280

pass

2922

3281

2923

3282

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

2924

3283

"true"})

2925

3284

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

2926

3285

def GetAllClients(self):

2927

3286

"D-Bus method"

2928

3287

return dbus.Array(c.dbus_object_path for c in

2929

tcp_server.clients.itervalues())

2930

3288

tcp_server.clients.values())

3289

2931

3290

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

2932

3291

"true"})

2933

3292

@dbus.service.method(_interface,

2935

3294

def GetAllClientsWithProperties(self):

2936

3295

"D-Bus method"

2937

3296

return dbus.Dictionary(

2938

{ c.dbus_object_path: c.GetAll(

3297

{c.dbus_object_path: c.GetAll(

2939

3298

"se.recompile.Mandos.Client")

2940

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

3299

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

2941

3300

signature="oa{sv}")

2942

3301

2943

3302

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

2944

3303

def RemoveClient(self, object_path):

2945

3304

"D-Bus method"

2946

for c in tcp_server.clients.itervalues():

3305

for c in tcp_server.clients.values():

2947

3306

if c.dbus_object_path == object_path:

2948

3307

del tcp_server.clients[c.name]

2949

3308

c.remove_from_connection()

2953

3312

self.client_removed_signal(c)

2954

3313

return

2955

3314

raise KeyError(object_path)

2956

3315

2957

3316

del _interface

2958

3317

2959

3318

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

2960

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

3319

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

2961

3320

def GetManagedObjects(self):

2962

3321

"""D-Bus method"""

2963

3322

return dbus.Dictionary(

2964

{ client.dbus_object_path:

2965

dbus.Dictionary(

2966

{ interface: client.GetAll(interface)

2967

for interface in

2968

client._get_all_interface_names()})

2969

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

2970

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

2971

3330

def client_added_signal(self, client):

2972

3331

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

2973

3332

if use_dbus:

2975

3334

self.InterfacesAdded(

2976

3335

client.dbus_object_path,

2977

3336

dbus.Dictionary(

2978

{ interface: client.GetAll(interface)

2979

for interface in

2980

client._get_all_interface_names()}))

3337

{interface: client.GetAll(interface)

3338

for interface in

3339

client._get_all_interface_names()}))

2981

3340

# Old signal

2982

3341

self.ClientAdded(client.dbus_object_path)

2983

3342

2984

3343

def client_removed_signal(self, client):

2985

3344

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

2986

3345

if use_dbus:

2991

3350

# Old signal

2992

3351

self.ClientRemoved(client.dbus_object_path,

2993

3352

client.name)

2994

3353

2995

3354

mandos_dbus_service = MandosDBusService()

2996

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

2997

3361

def cleanup():

2998

3362

"Cleanup function; run on exit"

2999

3363

if zeroconf:

3000

3364

service.cleanup()

3001

3002

multiprocessing.active_children()

3003

wnull.close()

3365

3366

mp.active_children()

3367

wn.close()

3004

3368

if not (tcp_server.clients or client_settings):

3005

3369

return

3006

3370

3007

3371

# Store client before exiting. Secrets are encrypted with key

3008

3372

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

3009

3373

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

3010

3374

clients = {}

3011

3375

with PGPEngine() as pgp:

3012

for client in tcp_server.clients.itervalues():

3376

for client in tcp_server.clients.values():

3013

3377

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

3014

3378

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

3015

3379

key)

3016

3380

client_dict = {}

3017

3381

3018

3382

# A list of attributes that can not be pickled

3019

3383

# + secret.

3020

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

3021

"checker", "server_settings" }

3384

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

3385

"checker", "server_settings"}

3022

3386

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

3023

3387

.Object):

3024

3388

exclude.add(name)

3025

3389

3026

3390

client_dict["encrypted_secret"] = (client

3027

3391

.encrypted_secret)

3028

3392

for attr in client.client_structure:

3029

3393

if attr not in exclude:

3030

3394

client_dict[attr] = getattr(client, attr)

3031

3395

3032

3396

clients[client.name] = client_dict

3033

3397

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

3034

3398

3035

3399

try:

3036

3400

with tempfile.NamedTemporaryFile(

3037

3401

mode='wb',

3039

3403

prefix='clients-',

3040

3404

dir=os.path.dirname(stored_state_path),

3041

3405

delete=False) as stored_state:

3042

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

3406

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

3407

protocol=2)

3043

3408

tempname = stored_state.name

3044

3409

os.rename(tempname, stored_state_path)

3045

3410

except (IOError, OSError) as e:

3055

3420

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

3056

3421

exc_info=e)

3057

3422

raise

3058

3423

3059

3424

# Delete all clients, and settings from config

3060

3425

while tcp_server.clients:

3061

3426

name, client = tcp_server.clients.popitem()

3064

3429

# Don't signal the disabling

3065

3430

client.disable(quiet=True)

3066

3431

# Emit D-Bus signal for removal

3067

mandos_dbus_service.client_removed_signal(client)

3432

if use_dbus:

3433

mandos_dbus_service.client_removed_signal(client)

3068

3434

client_settings.clear()

3069

3435

3070

3436

atexit.register(cleanup)

3071

3072

for client in tcp_server.clients.itervalues():

3437

3438

for client in tcp_server.clients.values():

3073

3439

if use_dbus:

3074

3440

# Emit D-Bus signal for adding

3075

3441

mandos_dbus_service.client_added_signal(client)

3076

3442

# Need to initiate checking of clients

3077

3443

if client.enabled:

3078

3444

client.init_checker()

3079

3445

3080

3446

tcp_server.enable()

3081

3447

tcp_server.server_activate()

3082

3448

3083

3449

# Find out what port we got

3084

3450

if zeroconf:

3085

3451

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

3090

3456

else: # IPv4

3091

3457

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

3092

3458

*tcp_server.socket.getsockname())

3093

3094

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

3095

3459

3460

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

3461

3096

3462

try:

3097

3463

if zeroconf:

3098

3464

# From the Avahi example code

3103

3469

cleanup()

3104

3470

sys.exit(1)

3105

3471

# End of Avahi example code

3106

3107

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

3108

lambda *args, **kwargs:

3109

(tcp_server.handle_request

3110

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

3111

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

3112

3478

logger.debug("Starting main loop")

3113

3479

main_loop.run()

3114

3480

except AvahiError as error: