/mandos/trunk : revision 950

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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 = "1.7.19"

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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.")

362

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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(*args, **kwargs)

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syslogger.setFormatter(logging.Formatter(

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

435

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.format(self.name)))

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return ret

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# Pretend that we have a GnuTLS module

507

class GnuTLS(object):

508

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

509

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

510

511

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

512

if library is None:

513

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

514

_library = ctypes.cdll.LoadLibrary(library)

515

del library

516

_need_version = b"3.3.0"

517

518

def __init__(self):

519

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

520

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

521

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

522

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

523

.format(self._need_version))

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# Unless otherwise indicated, the constants and types below are

526

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

527

528

# Constants

529

E_SUCCESS = 0

530

E_INTERRUPTED = -52

531

E_AGAIN = -28

532

CRT_OPENPGP = 2

533

CLIENT = 2

534

SHUT_RDWR = 0

535

CRD_CERTIFICATE = 1

536

E_NO_CERTIFICATE_FOUND = -49

537

OPENPGP_FMT_RAW = 0 # gnutls/openpgp.h

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539

# Types

540

class session_int(ctypes.Structure):

541

_fields_ = []

542

session_t = ctypes.POINTER(session_int)

543

544

class certificate_credentials_st(ctypes.Structure):

545

_fields_ = []

546

certificate_credentials_t = ctypes.POINTER(

547

certificate_credentials_st)

548

certificate_type_t = ctypes.c_int

549

550

class datum_t(ctypes.Structure):

551

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

552

('size', ctypes.c_uint)]

553

554

class openpgp_crt_int(ctypes.Structure):

555

_fields_ = []

556

openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)

557

openpgp_crt_fmt_t = ctypes.c_int # gnutls/openpgp.h

558

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

559

credentials_type_t = ctypes.c_int

560

transport_ptr_t = ctypes.c_void_p

561

close_request_t = ctypes.c_int

562

563

# Exceptions

564

class Error(Exception):

565

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

566

# exception might be raised from within GnuTLS.__init__,

567

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

568

# global variable has happened.

569

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

570

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

571

# code is passed, convert it to a string with

572

# gnutls.strerror()

573

self.code = code

574

if message is None and code is not None:

575

message = GnuTLS.strerror(code)

576

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

577

message, *args)

578

579

class CertificateSecurityError(Error):

580

pass

581

582

# Classes

583

class Credentials(object):

584

def __init__(self):

585

self._c_object = gnutls.certificate_credentials_t()

586

gnutls.certificate_allocate_credentials(

587

ctypes.byref(self._c_object))

588

self.type = gnutls.CRD_CERTIFICATE

589

590

def __del__(self):

591

gnutls.certificate_free_credentials(self._c_object)

592

593

class ClientSession(object):

594

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

595

self._c_object = gnutls.session_t()

596

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

597

gnutls.set_default_priority(self._c_object)

598

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

599

gnutls.handshake_set_private_extensions(self._c_object,

600

True)

601

self.socket = socket

602

if credentials is None:

603

credentials = gnutls.Credentials()

604

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

605

ctypes.cast(credentials._c_object,

606

ctypes.c_void_p))

607

self.credentials = credentials

608

609

def __del__(self):

610

gnutls.deinit(self._c_object)

611

612

def handshake(self):

613

return gnutls.handshake(self._c_object)

614

615

def send(self, data):

616

data = bytes(data)

617

data_len = len(data)

618

while data_len > 0:

619

data_len -= gnutls.record_send(self._c_object,

620

data[-data_len:],

621

data_len)

622

623

def bye(self):

624

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

625

626

# Error handling functions

627

def _error_code(result):

628

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

629

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

630

if result >= 0:

631

return result

632

if result == gnutls.E_NO_CERTIFICATE_FOUND:

633

raise gnutls.CertificateSecurityError(code=result)

634

raise gnutls.Error(code=result)

635

636

def _retry_on_error(result, func, arguments):

637

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

638

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

639

while result < 0:

640

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

641

return _error_code(result)

642

result = func(*arguments)

643

return result

644

645

# Unless otherwise indicated, the function declarations below are

646

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

647

648

# Functions

649

priority_set_direct = _library.gnutls_priority_set_direct

650

priority_set_direct.argtypes = [session_t, ctypes.c_char_p,

651

ctypes.POINTER(ctypes.c_char_p)]

652

priority_set_direct.restype = _error_code

653

654

init = _library.gnutls_init

655

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

656

init.restype = _error_code

657

658

set_default_priority = _library.gnutls_set_default_priority

659

set_default_priority.argtypes = [session_t]

660

set_default_priority.restype = _error_code

661

662

record_send = _library.gnutls_record_send

663

record_send.argtypes = [session_t, ctypes.c_void_p,

664

ctypes.c_size_t]

665

record_send.restype = ctypes.c_ssize_t

666

record_send.errcheck = _retry_on_error

667

668

certificate_allocate_credentials = (

669

_library.gnutls_certificate_allocate_credentials)

670

certificate_allocate_credentials.argtypes = [

671

ctypes.POINTER(certificate_credentials_t)]

672

certificate_allocate_credentials.restype = _error_code

673

674

certificate_free_credentials = (

675

_library.gnutls_certificate_free_credentials)

676

certificate_free_credentials.argtypes = [

677

certificate_credentials_t]

678

certificate_free_credentials.restype = None

679

680

handshake_set_private_extensions = (

681

_library.gnutls_handshake_set_private_extensions)

682

handshake_set_private_extensions.argtypes = [session_t,

683

ctypes.c_int]

684

handshake_set_private_extensions.restype = None

685

686

credentials_set = _library.gnutls_credentials_set

687

credentials_set.argtypes = [session_t, credentials_type_t,

688

ctypes.c_void_p]

689

credentials_set.restype = _error_code

690

691

strerror = _library.gnutls_strerror

692

strerror.argtypes = [ctypes.c_int]

693

strerror.restype = ctypes.c_char_p

694

695

certificate_type_get = _library.gnutls_certificate_type_get

696

certificate_type_get.argtypes = [session_t]

697

certificate_type_get.restype = _error_code

698

699

certificate_get_peers = _library.gnutls_certificate_get_peers

700

certificate_get_peers.argtypes = [session_t,

701

ctypes.POINTER(ctypes.c_uint)]

702

certificate_get_peers.restype = ctypes.POINTER(datum_t)

703

704

global_set_log_level = _library.gnutls_global_set_log_level

705

global_set_log_level.argtypes = [ctypes.c_int]

706

global_set_log_level.restype = None

707

708

global_set_log_function = _library.gnutls_global_set_log_function

709

global_set_log_function.argtypes = [log_func]

710

global_set_log_function.restype = None

711

712

deinit = _library.gnutls_deinit

713

deinit.argtypes = [session_t]

714

deinit.restype = None

715

716

handshake = _library.gnutls_handshake

717

handshake.argtypes = [session_t]

718

handshake.restype = _error_code

719

handshake.errcheck = _retry_on_error

720

721

transport_set_ptr = _library.gnutls_transport_set_ptr

722

transport_set_ptr.argtypes = [session_t, transport_ptr_t]

723

transport_set_ptr.restype = None

724

725

bye = _library.gnutls_bye

726

bye.argtypes = [session_t, close_request_t]

727

bye.restype = _error_code

728

bye.errcheck = _retry_on_error

729

730

check_version = _library.gnutls_check_version

731

check_version.argtypes = [ctypes.c_char_p]

732

check_version.restype = ctypes.c_char_p

733

734

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

735

736

openpgp_crt_init = _library.gnutls_openpgp_crt_init

737

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

738

openpgp_crt_init.restype = _error_code

739

740

openpgp_crt_import = _library.gnutls_openpgp_crt_import

741

openpgp_crt_import.argtypes = [openpgp_crt_t,

742

ctypes.POINTER(datum_t),

743

openpgp_crt_fmt_t]

744

openpgp_crt_import.restype = _error_code

745

746

openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self

747

openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,

748

ctypes.POINTER(ctypes.c_uint)]

749

openpgp_crt_verify_self.restype = _error_code

750

751

openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit

752

openpgp_crt_deinit.argtypes = [openpgp_crt_t]

753

openpgp_crt_deinit.restype = None

754

755

openpgp_crt_get_fingerprint = (

756

_library.gnutls_openpgp_crt_get_fingerprint)

757

openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,

758

ctypes.c_void_p,

759

ctypes.POINTER(

760

ctypes.c_size_t)]

761

openpgp_crt_get_fingerprint.restype = _error_code

762

763

# Remove non-public functions

764

del _error_code, _retry_on_error

765

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

766

gnutls = GnuTLS()

767

768

438

769

def call_pipe(connection, # : multiprocessing.Connection

439

770

func, *args, **kwargs):

440

771

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

441

772

442

773

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

443

774

return value on the provided multiprocessing.Connection.

444

775

"""

445

776

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

446

777

connection.close()

447

778

779

448

780

class Client(object):

449

781

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

450

782

451

783

Attributes:

452

784

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

453

785

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

455

787

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

456

788

to see if the client lives.

457

789

'None' if no process is running.

458

checker_callback_tag: a gobject event source tag, or None

790

checker_callback_tag: a GLib event source tag, or None

459

791

checker_command: string; External command which is run to check

460

792

if client lives. %() expansions are done at

461

793

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

462

794

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

463

checker_initiator_tag: a gobject event source tag, or None

795

checker_initiator_tag: a GLib event source tag, or None

464

796

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

465

797

client_structure: Object describing what attributes a client has

466

798

and is used for storing the client at exit

467

799

current_checker_command: string; current running checker_command

468

disable_initiator_tag: a gobject event source tag, or None

800

disable_initiator_tag: a GLib event source tag, or None

469

801

enabled: bool()

470

802

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

471

803

uniquely identify the client

490

822

disabled, or None

491

823

server_settings: The server_settings dict from main()

492

824

"""

493

825

494

826

runtime_expansions = ("approval_delay", "approval_duration",

495

827

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

496

828

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

507

839

"approved_by_default": "True",

508

840

"enabled": "True",

509

841

}

510

842

511

843

@staticmethod

512

844

def config_parser(config):

513

845

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

520

852

for client_name in config.sections():

521

853

section = dict(config.items(client_name))

522

854

client = settings[client_name] = {}

523

855

524

856

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

525

857

# Reformat values from string types to Python types

526

858

client["approved_by_default"] = config.getboolean(

527

859

client_name, "approved_by_default")

528

860

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

529

861

"enabled")

530

862

531

863

# Uppercase and remove spaces from fingerprint for later

532

864

# comparison purposes with return value from the

533

865

# fingerprint() function

534

866

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

535

867

.replace(" ", ""))

536

868

if "secret" in section:

537

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

869

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

870

.encode("utf-8"),

871

"base64")

538

872

elif "secfile" in section:

539

873

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

540

874

(section["secfile"])),

555

889

client["last_approval_request"] = None

556

890

client["last_checked_ok"] = None

557

891

client["last_checker_status"] = -2

558

892

559

893

return settings

560

561

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

894

895

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

562

896

self.name = name

563

897

if server_settings is None:

564

898

server_settings = {}

566

900

# adding all client settings

567

901

for setting, value in settings.items():

568

902

setattr(self, setting, value)

569

903

570

904

if self.enabled:

571

905

if not hasattr(self, "last_enabled"):

572

906

self.last_enabled = datetime.datetime.utcnow()

576

910

else:

577

911

self.last_enabled = None

578

912

self.expires = None

579

913

580

914

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

581

915

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

582

916

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

583

917

datetime.datetime.utcnow())

584

918

585

919

# attributes specific for this server instance

586

920

self.checker = None

587

921

self.checker_initiator_tag = None

593

927

self.changedstate = multiprocessing_manager.Condition(

594

928

multiprocessing_manager.Lock())

595

929

self.client_structure = [attr

596

for attr in self.__dict__.iterkeys()

930

for attr in self.__dict__.keys()

597

931

if not attr.startswith("_")]

598

932

self.client_structure.append("client_structure")

599

933

600

934

for name, t in inspect.getmembers(

601

935

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

602

936

if not name.startswith("_"):

603

937

self.client_structure.append(name)

604

938

605

939

# Send notice to process children that client state has changed

606

940

def send_changedstate(self):

607

941

with self.changedstate:

608

942

self.changedstate.notify_all()

609

943

610

944

def enable(self):

611

945

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

612

946

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

617

951

self.last_enabled = datetime.datetime.utcnow()

618

952

self.init_checker()

619

953

self.send_changedstate()

620

954

621

955

def disable(self, quiet=True):

622

956

"""Disable this client."""

623

957

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

625

959

if not quiet:

626

960

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

627

961

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

628

gobject.source_remove(self.disable_initiator_tag)

962

GLib.source_remove(self.disable_initiator_tag)

629

963

self.disable_initiator_tag = None

630

964

self.expires = None

631

965

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

632

gobject.source_remove(self.checker_initiator_tag)

966

GLib.source_remove(self.checker_initiator_tag)

633

967

self.checker_initiator_tag = None

634

968

self.stop_checker()

635

969

self.enabled = False

636

970

if not quiet:

637

971

self.send_changedstate()

638

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

972

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

639

973

return False

640

974

641

975

def __del__(self):

642

976

self.disable()

643

977

644

978

def init_checker(self):

645

979

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

646

980

# and every interval from then on.

647

981

if self.checker_initiator_tag is not None:

648

gobject.source_remove(self.checker_initiator_tag)

649

self.checker_initiator_tag = gobject.timeout_add(

982

GLib.source_remove(self.checker_initiator_tag)

983

self.checker_initiator_tag = GLib.timeout_add(

650

984

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

651

985

self.start_checker)

652

986

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

653

987

if self.disable_initiator_tag is not None:

654

gobject.source_remove(self.disable_initiator_tag)

655

self.disable_initiator_tag = gobject.timeout_add(

988

GLib.source_remove(self.disable_initiator_tag)

989

self.disable_initiator_tag = GLib.timeout_add(

656

990

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

657

991

# Also start a new checker *right now*.

658

992

self.start_checker()

659

993

660

994

def checker_callback(self, source, condition, connection,

661

995

command):

662

996

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

665

999

# Read return code from connection (see call_pipe)

666

1000

returncode = connection.recv()

667

1001

connection.close()

668

1002

669

1003

if returncode >= 0:

670

1004

self.last_checker_status = returncode

671

1005

self.last_checker_signal = None

681

1015

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

682

1016

vars(self))

683

1017

return False

684

1018

685

1019

def checked_ok(self):

686

1020

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

687

1021

self.last_checked_ok = datetime.datetime.utcnow()

688

1022

self.last_checker_status = 0

689

1023

self.last_checker_signal = None

690

1024

self.bump_timeout()

691

1025

692

1026

def bump_timeout(self, timeout=None):

693

1027

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

694

1028

if timeout is None:

695

1029

timeout = self.timeout

696

1030

if self.disable_initiator_tag is not None:

697

gobject.source_remove(self.disable_initiator_tag)

1031

GLib.source_remove(self.disable_initiator_tag)

698

1032

self.disable_initiator_tag = None

699

1033

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

700

self.disable_initiator_tag = gobject.timeout_add(

1034

self.disable_initiator_tag = GLib.timeout_add(

701

1035

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

702

1036

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

703

1037

704

1038

def need_approval(self):

705

1039

self.last_approval_request = datetime.datetime.utcnow()

706

1040

707

1041

def start_checker(self):

708

1042

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

709

1043

710

1044

If a checker already exists, leave it running and do

711

1045

nothing."""

712

1046

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

717

1051

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

718

1052

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

719

1053

# should be.

720

1054

721

1055

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

722

1056

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

723

1057

self.checker.join()

727

1061

# Escape attributes for the shell

728

1062

escaped_attrs = {

729

1063

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

730

for attr in self.runtime_expansions }

1064

for attr in self.runtime_expansions}

731

1065

try:

732

1066

command = self.checker_command % escaped_attrs

733

1067

except TypeError as error:

745

1079

# The exception is when not debugging but nevertheless

746

1080

# running in the foreground; use the previously

747

1081

# created wnull.

748

popen_args = { "close_fds": True,

749

"shell": True,

750

"cwd": "/" }

1082

popen_args = {"close_fds": True,

1083

"shell": True,

1084

"cwd": "/"}

751

1085

if (not self.server_settings["debug"]

752

1086

and self.server_settings["foreground"]):

753

1087

popen_args.update({"stdout": wnull,

754

"stderr": wnull })

755

pipe = multiprocessing.Pipe(duplex = False)

1088

"stderr": wnull})

1089

pipe = multiprocessing.Pipe(duplex=False)

756

1090

self.checker = multiprocessing.Process(

757

target = call_pipe,

758

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

759

kwargs = popen_args)

1091

target=call_pipe,

1092

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

1093

kwargs=popen_args)

760

1094

self.checker.start()

761

self.checker_callback_tag = gobject.io_add_watch(

762

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

1095

self.checker_callback_tag = GLib.io_add_watch(

1096

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

763

1097

self.checker_callback, pipe[0], command)

764

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

1098

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

765

1099

return True

766

1100

767

1101

def stop_checker(self):

768

1102

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

769

1103

if self.checker_callback_tag:

770

gobject.source_remove(self.checker_callback_tag)

1104

GLib.source_remove(self.checker_callback_tag)

771

1105

self.checker_callback_tag = None

772

1106

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

773

1107

return

782

1116

byte_arrays=False):

783

1117

"""Decorators for marking methods of a DBusObjectWithProperties to

784

1118

become properties on the D-Bus.

785

1119

786

1120

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

787

1121

and with one argument by "Set".

788

1122

789

1123

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

790

1124

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

791

1125

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

795

1129

if byte_arrays and signature != "ay":

796

1130

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

797

1131

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

798

1132

799

1133

def decorator(func):

800

1134

func._dbus_is_property = True

801

1135

func._dbus_interface = dbus_interface

804

1138

func._dbus_name = func.__name__

805

1139

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

806

1140

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

807

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

1141

func._dbus_get_args_options = {'byte_arrays': byte_arrays}

808

1142

return func

809

1143

810

1144

return decorator

811

1145

812

1146

813

1147

def dbus_interface_annotations(dbus_interface):

814

1148

"""Decorator for marking functions returning interface annotations

815

1149

816

1150

Usage:

817

1151

818

1152

@dbus_interface_annotations("org.example.Interface")

819

1153

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

820

1154

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

821

1155

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

822

1156

"false"}

823

1157

"""

824

1158

825

1159

def decorator(func):

826

1160

func._dbus_is_interface = True

827

1161

func._dbus_interface = dbus_interface

828

1162

func._dbus_name = dbus_interface

829

1163

return func

830

1164

831

1165

return decorator

832

1166

833

1167

834

1168

def dbus_annotations(annotations):

835

1169

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

836

1170

Usage:

837

1171

838

1172

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

839

1173

"org.freedesktop.DBus.Property."

840

1174

"EmitsChangedSignal": "false"})

842

1176

access="r")

843

1177

def Property_dbus_property(self):

844

1178

return dbus.Boolean(False)

845

1179

846

1180

See also the DBusObjectWithAnnotations class.

847

1181

"""

848

1182

849

1183

def decorator(func):

850

1184

func._dbus_annotations = annotations

851

1185

return func

852

1186

853

1187

return decorator

854

1188

855

1189

873

1207

874

1208

class DBusObjectWithAnnotations(dbus.service.Object):

875

1209

"""A D-Bus object with annotations.

876

1210

877

1211

Classes inheriting from this can use the dbus_annotations

878

1212

decorator to add annotations to methods or signals.

879

1213

"""

880

1214

881

1215

@staticmethod

882

1216

def _is_dbus_thing(thing):

883

1217

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

884

1218

885

1219

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

886

1220

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

887

1221

"""

888

1222

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

889

1223

False)

890

1224

891

1225

def _get_all_dbus_things(self, thing):

892

1226

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

893

1227

"""

896

1230

for cls in self.__class__.__mro__

897

1231

for name, athing in

898

1232

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

899

1233

900

1234

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

901

out_signature = "s",

902

path_keyword = 'object_path',

903

connection_keyword = 'connection')

1235

out_signature="s",

1236

path_keyword='object_path',

1237

connection_keyword='connection')

904

1238

def Introspect(self, object_path, connection):

905

1239

"""Overloading of standard D-Bus method.

906

1240

907

1241

Inserts annotation tags on methods and signals.

908

1242

"""

909

1243

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

910

1244

connection)

911

1245

try:

912

1246

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

913

1247

914

1248

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

915

1249

# Add annotation tags

916

1250

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

943

1277

if_tag.appendChild(ann_tag)

944

1278

# Fix argument name for the Introspect method itself

945

1279

if (if_tag.getAttribute("name")

946

== dbus.INTROSPECTABLE_IFACE):

1280

== dbus.INTROSPECTABLE_IFACE):

947

1281

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

948

1282

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

949

1283

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

962

1296

963

1297

class DBusObjectWithProperties(DBusObjectWithAnnotations):

964

1298

"""A D-Bus object with properties.

965

1299

966

1300

Classes inheriting from this can use the dbus_service_property

967

1301

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

968

1302

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

969

1303

"""

970

1304

971

1305

def _get_dbus_property(self, interface_name, property_name):

972

1306

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

973

1307

property with the specified name and interface.

978

1312

if (value._dbus_name == property_name

979

1313

and value._dbus_interface == interface_name):

980

1314

return value.__get__(self)

981

1315

982

1316

# No such property

983

1317

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

984

1318

self.dbus_object_path, interface_name, property_name))

985

1319

986

1320

@classmethod

987

1321

def _get_all_interface_names(cls):

988

1322

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

991

1325

for x in (inspect.getmro(cls))

992

1326

for attr in dir(x))

993

1327

if name is not None)

994

1328

995

1329

@dbus.service.method(dbus.PROPERTIES_IFACE,

996

1330

in_signature="ss",

997

1331

out_signature="v")

1005

1339

if not hasattr(value, "variant_level"):

1006

1340

return value

1007

1341

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

1008

1342

1009

1343

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

1010

1344

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

1011

1345

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

1023

1357

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

1024

1358

for byte in value))

1025

1359

prop(value)

1026

1360

1027

1361

@dbus.service.method(dbus.PROPERTIES_IFACE,

1028

1362

in_signature="s",

1029

1363

out_signature="a{sv}")

1030

1364

def GetAll(self, interface_name):

1031

1365

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

1032

1366

standard.

1033

1367

1034

1368

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

1035

1369

"""

1036

1370

properties = {}

1047

1381

properties[name] = value

1048

1382

continue

1049

1383

properties[name] = type(value)(

1050

value, variant_level = value.variant_level + 1)

1384

value, variant_level=value.variant_level + 1)

1051

1385

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

1052

1386

1053

1387

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

1054

1388

def PropertiesChanged(self, interface_name, changed_properties,

1055

1389

invalidated_properties):

1057

1391

standard.

1058

1392

"""

1059

1393

pass

1060

1394

1061

1395

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1062

1396

out_signature="s",

1063

1397

path_keyword='object_path',

1064

1398

connection_keyword='connection')

1065

1399

def Introspect(self, object_path, connection):

1066

1400

"""Overloading of standard D-Bus method.

1067

1401

1068

1402

Inserts property tags and interface annotation tags.

1069

1403

"""

1070

1404

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1072

1406

connection)

1073

1407

try:

1074

1408

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

1075

1409

1076

1410

def make_tag(document, name, prop):

1077

1411

e = document.createElement("property")

1078

1412

e.setAttribute("name", name)

1079

1413

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

1080

1414

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

1081

1415

return e

1082

1416

1083

1417

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

1084

1418

# Add property tags

1085

1419

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

1127

1461

exc_info=error)

1128

1462

return xmlstring

1129

1463

1464

1130

1465

try:

1131

1466

dbus.OBJECT_MANAGER_IFACE

1132

1467

except AttributeError:

1133

1468

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

1134

1469

1470

1135

1471

class DBusObjectWithObjectManager(DBusObjectWithAnnotations):

1136

1472

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

1137

1473

1138

1474

Classes inheriting from this exposes the standard

1139

1475

GetManagedObjects call and the InterfacesAdded and

1140

1476

InterfacesRemoved signals on the standard

1141

1477

"org.freedesktop.DBus.ObjectManager" interface.

1142

1478

1143

1479

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

1144

1480

manually.

1145

1481

"""

1146

1482

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

1147

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

1483

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

1148

1484

def GetManagedObjects(self):

1149

1485

"""This function must be overridden"""

1150

1486

raise NotImplementedError()

1151

1487

1152

1488

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,

1153

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

1489

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

1154

1490

def InterfacesAdded(self, object_path, interfaces_and_properties):

1155

1491

pass

1156

1157

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

1492

1493

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

1158

1494

def InterfacesRemoved(self, object_path, interfaces):

1159

1495

pass

1160

1496

1161

1497

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1162

out_signature = "s",

1163

path_keyword = 'object_path',

1164

connection_keyword = 'connection')

1498

out_signature="s",

1499

path_keyword='object_path',

1500

connection_keyword='connection')

1165

1501

def Introspect(self, object_path, connection):

1166

1502

"""Overloading of standard D-Bus method.

1167

1503

1168

1504

Override return argument name of GetManagedObjects to be

1169

1505

"objpath_interfaces_and_properties"

1170

1506

"""

1173

1509

connection)

1174

1510

try:

1175

1511

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

1176

1512

1177

1513

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

1178

1514

# Fix argument name for the GetManagedObjects method

1179

1515

if (if_tag.getAttribute("name")

1180

== dbus.OBJECT_MANAGER_IFACE):

1516

== dbus.OBJECT_MANAGER_IFACE):

1181

1517

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

1182

1518

if (cn.getAttribute("name")

1183

1519

== "GetManagedObjects"):

1193

1529

except (AttributeError, xml.dom.DOMException,

1194

1530

xml.parsers.expat.ExpatError) as error:

1195

1531

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

1196

exc_info = error)

1532

exc_info=error)

1197

1533

return xmlstring

1198

1534

1535

1199

1536

def datetime_to_dbus(dt, variant_level=0):

1200

1537

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

1201

1538

if dt is None:

1202

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

1539

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

1203

1540

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

1204

1541

1205

1542

1208

1545

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

1209

1546

interface names according to the "alt_interface_names" mapping.

1210

1547

Usage:

1211

1548

1212

1549

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

1213

1550

"net.example.AlternateInterface"})

1214

1551

class SampleDBusObject(dbus.service.Object):

1215

1552

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

1216

1553

def SampleDBusMethod():

1217

1554

pass

1218

1555

1219

1556

The above "SampleDBusMethod" on "SampleDBusObject" will be

1220

1557

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

1221

1558

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

1222

1559

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

1223

1560

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

1224

1561

1225

1562

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

1226

1563

(from DBusObjectWithProperties) and interfaces (from the

1227

1564

dbus_interface_annotations decorator).

1228

1565

"""

1229

1566

1230

1567

def wrapper(cls):

1231

1568

for orig_interface_name, alt_interface_name in (

1232

1569

alt_interface_names.items()):

1247

1584

interface_names.add(alt_interface)

1248

1585

# Is this a D-Bus signal?

1249

1586

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

1587

# Extract the original non-method undecorated

1588

# function by black magic

1250

1589

if sys.version_info.major == 2:

1251

# Extract the original non-method undecorated

1252

# function by black magic

1253

1590

nonmethod_func = (dict(

1254

1591

zip(attribute.func_code.co_freevars,

1255

1592

attribute.__closure__))

1256

1593

["func"].cell_contents)

1257

1594

else:

1258

nonmethod_func = attribute

1595

nonmethod_func = (dict(

1596

zip(attribute.__code__.co_freevars,

1597

attribute.__closure__))

1598

["func"].cell_contents)

1259

1599

# Create a new, but exactly alike, function

1260

1600

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

1261

1601

# 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__)

1602

new_function = copy_function(nonmethod_func)

1276

1603

new_function = (dbus.service.signal(

1277

1604

alt_interface,

1278

1605

attribute._dbus_signature)(new_function))

1282

1609

attribute._dbus_annotations)

1283

1610

except AttributeError:

1284

1611

pass

1612

1285

1613

# Define a creator of a function to call both the

1286

1614

# original and alternate functions, so both the

1287

1615

# original and alternate signals gets sent when

1290

1618

"""This function is a scope container to pass

1291

1619

func1 and func2 to the "call_both" function

1292

1620

outside of its arguments"""

1293

1621

1294

1622

@functools.wraps(func2)

1295

1623

def call_both(*args, **kwargs):

1296

1624

"""This function will emit two D-Bus

1297

1625

signals by calling func1 and func2"""

1298

1626

func1(*args, **kwargs)

1299

1627

func2(*args, **kwargs)

1300

# Make wrapper function look like a D-Bus signal

1628

# Make wrapper function look like a D-Bus

1629

# signal

1301

1630

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

1302

1631

if name.startswith("_dbus_"):

1303

1632

setattr(call_both, name, attr)

1304

1633

1305

1634

return call_both

1306

1635

# Create the "call_both" function and add it to

1307

1636

# the class

1317

1646

alt_interface,

1318

1647

attribute._dbus_in_signature,

1319

1648

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)))

1649

(copy_function(attribute)))

1325

1650

# Copy annotations, if any

1326

1651

try:

1327

1652

attr[attrname]._dbus_annotations = dict(

1339

1664

attribute._dbus_access,

1340

1665

attribute._dbus_get_args_options

1341

1666

["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)))

1667

(copy_function(attribute)))

1348

1668

# Copy annotations, if any

1349

1669

try:

1350

1670

attr[attrname]._dbus_annotations = dict(

1359

1679

# to the class.

1360

1680

attr[attrname] = (

1361

1681

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)))

1682

(copy_function(attribute)))

1367

1683

if deprecate:

1368

1684

# Deprecate all alternate interfaces

1369

iname="_AlternateDBusNames_interface_annotation{}"

1685

iname = "_AlternateDBusNames_interface_annotation{}"

1370

1686

for interface_name in interface_names:

1371

1687

1372

1688

@dbus_interface_annotations(interface_name)

1373

1689

def func(self):

1374

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

1375

"true" }

1690

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

1691

"true"}

1376

1692

# Find an unused name

1377

1693

for aname in (iname.format(i)

1378

1694

for i in itertools.count()):

1382

1698

if interface_names:

1383

1699

# Replace the class with a new subclass of it with

1384

1700

# methods, signals, etc. as created above.

1385

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

1386

(cls, ), attr)

1701

if sys.version_info.major == 2:

1702

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

1703

(cls, ), attr)

1704

else:

1705

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

1706

(cls, ), attr)

1387

1707

return cls

1388

1708

1389

1709

return wrapper

1390

1710

1391

1711

1393

1713

"se.bsnet.fukt.Mandos"})

1394

1714

class ClientDBus(Client, DBusObjectWithProperties):

1395

1715

"""A Client class using D-Bus

1396

1716

1397

1717

Attributes:

1398

1718

dbus_object_path: dbus.ObjectPath

1399

1719

bus: dbus.SystemBus()

1400

1720

"""

1401

1721

1402

1722

runtime_expansions = (Client.runtime_expansions

1403

1723

+ ("dbus_object_path", ))

1404

1724

1405

1725

_interface = "se.recompile.Mandos.Client"

1406

1726

1407

1727

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

1408

1409

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

1728

1729

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

1410

1730

self.bus = bus

1411

1731

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

1412

1732

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

1418

1738

"/clients/" + client_object_name)

1419

1739

DBusObjectWithProperties.__init__(self, self.bus,

1420

1740

self.dbus_object_path)

1421

1741

1422

1742

def notifychangeproperty(transform_func, dbus_name,

1423

1743

type_func=lambda x: x,

1424

1744

variant_level=1,

1426

1746

_interface=_interface):

1427

1747

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

1428

1748

its changes to DBus.

1429

1749

1430

1750

transform_fun: Function that takes a value and a variant_level

1431

1751

and transforms it to a D-Bus type.

1432

1752

dbus_name: D-Bus name of the variable

1435

1755

variant_level: D-Bus variant level. Default: 1

1436

1756

"""

1437

1757

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

1438

1758

1439

1759

def setter(self, value):

1440

1760

if hasattr(self, "dbus_object_path"):

1441

1761

if (not hasattr(self, attrname) or

1448

1768

else:

1449

1769

dbus_value = transform_func(

1450

1770

type_func(value),

1451

variant_level = variant_level)

1771

variant_level=variant_level)

1452

1772

self.PropertyChanged(dbus.String(dbus_name),

1453

1773

dbus_value)

1454

1774

self.PropertiesChanged(

1455

1775

_interface,

1456

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

1457

dbus_value }),

1776

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

1777

dbus_value}),

1458

1778

dbus.Array())

1459

1779

setattr(self, attrname, value)

1460

1780

1461

1781

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

1462

1782

1463

1783

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1464

1784

approvals_pending = notifychangeproperty(dbus.Boolean,

1465

1785

"ApprovalPending",

1466

type_func = bool)

1786

type_func=bool)

1467

1787

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

1468

1788

last_enabled = notifychangeproperty(datetime_to_dbus,

1469

1789

"LastEnabled")

1470

1790

checker = notifychangeproperty(

1471

1791

dbus.Boolean, "CheckerRunning",

1472

type_func = lambda checker: checker is not None)

1792

type_func=lambda checker: checker is not None)

1473

1793

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1474

1794

"LastCheckedOK")

1475

1795

last_checker_status = notifychangeproperty(dbus.Int16,

1480

1800

"ApprovedByDefault")

1481

1801

approval_delay = notifychangeproperty(

1482

1802

dbus.UInt64, "ApprovalDelay",

1483

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

1803

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

1484

1804

approval_duration = notifychangeproperty(

1485

1805

dbus.UInt64, "ApprovalDuration",

1486

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

1806

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

1487

1807

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

1488

1808

timeout = notifychangeproperty(

1489

1809

dbus.UInt64, "Timeout",

1490

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

1810

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

1491

1811

extended_timeout = notifychangeproperty(

1492

1812

dbus.UInt64, "ExtendedTimeout",

1493

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

1813

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

1494

1814

interval = notifychangeproperty(

1495

1815

dbus.UInt64, "Interval",

1496

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

1816

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

1497

1817

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

1498

1818

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

1499

1819

invalidate_only=True)

1500

1820

1501

1821

del notifychangeproperty

1502

1822

1503

1823

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

1504

1824

try:

1505

1825

self.remove_from_connection()

1508

1828

if hasattr(DBusObjectWithProperties, "__del__"):

1509

1829

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

1510

1830

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

1511

1831

1512

1832

def checker_callback(self, source, condition,

1513

1833

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

1514

1834

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

1530

1850

| self.last_checker_signal),

1531

1851

dbus.String(command))

1532

1852

return ret

1533

1853

1534

1854

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

1535

1855

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

1536

1856

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

1540

1860

# Emit D-Bus signal

1541

1861

self.CheckerStarted(self.current_checker_command)

1542

1862

return r

1543

1863

1544

1864

def _reset_approved(self):

1545

1865

self.approved = None

1546

1866

return False

1547

1867

1548

1868

def approve(self, value=True):

1549

1869

self.approved = value

1550

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

1551

* 1000), self._reset_approved)

1870

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

1871

* 1000), self._reset_approved)

1552

1872

self.send_changedstate()

1553

1554

## D-Bus methods, signals & properties

1555

1556

## Interfaces

1557

1558

## Signals

1559

1873

1874

# D-Bus methods, signals & properties

1875

1876

# Interfaces

1877

1878

# Signals

1879

1560

1880

# CheckerCompleted - signal

1561

1881

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

1562

1882

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

1563

1883

"D-Bus signal"

1564

1884

pass

1565

1885

1566

1886

# CheckerStarted - signal

1567

1887

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

1568

1888

def CheckerStarted(self, command):

1569

1889

"D-Bus signal"

1570

1890

pass

1571

1891

1572

1892

# PropertyChanged - signal

1573

1893

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

1574

1894

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

1575

1895

def PropertyChanged(self, property, value):

1576

1896

"D-Bus signal"

1577

1897

pass

1578

1898

1579

1899

# GotSecret - signal

1580

1900

@dbus.service.signal(_interface)

1581

1901

def GotSecret(self):

1584

1904

server to mandos-client

1585

1905

"""

1586

1906

pass

1587

1907

1588

1908

# Rejected - signal

1589

1909

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

1590

1910

def Rejected(self, reason):

1591

1911

"D-Bus signal"

1592

1912

pass

1593

1913

1594

1914

# NeedApproval - signal

1595

1915

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

1596

1916

def NeedApproval(self, timeout, default):

1597

1917

"D-Bus signal"

1598

1918

return self.need_approval()

1599

1600

## Methods

1601

1919

1920

# Methods

1921

1602

1922

# Approve - method

1603

1923

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

1604

1924

def Approve(self, value):

1605

1925

self.approve(value)

1606

1926

1607

1927

# CheckedOK - method

1608

1928

@dbus.service.method(_interface)

1609

1929

def CheckedOK(self):

1610

1930

self.checked_ok()

1611

1931

1612

1932

# Enable - method

1613

1933

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

1614

1934

@dbus.service.method(_interface)

1615

1935

def Enable(self):

1616

1936

"D-Bus method"

1617

1937

self.enable()

1618

1938

1619

1939

# StartChecker - method

1620

1940

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

1621

1941

@dbus.service.method(_interface)

1622

1942

def StartChecker(self):

1623

1943

"D-Bus method"

1624

1944

self.start_checker()

1625

1945

1626

1946

# Disable - method

1627

1947

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

1628

1948

@dbus.service.method(_interface)

1629

1949

def Disable(self):

1630

1950

"D-Bus method"

1631

1951

self.disable()

1632

1952

1633

1953

# StopChecker - method

1634

1954

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

1635

1955

@dbus.service.method(_interface)

1636

1956

def StopChecker(self):

1637

1957

self.stop_checker()

1638

1639

## Properties

1640

1958

1959

# Properties

1960

1641

1961

# ApprovalPending - property

1642

1962

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

1643

1963

def ApprovalPending_dbus_property(self):

1644

1964

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

1645

1965

1646

1966

# ApprovedByDefault - property

1647

1967

@dbus_service_property(_interface,

1648

1968

signature="b",

1651

1971

if value is None: # get

1652

1972

return dbus.Boolean(self.approved_by_default)

1653

1973

self.approved_by_default = bool(value)

1654

1974

1655

1975

# ApprovalDelay - property

1656

1976

@dbus_service_property(_interface,

1657

1977

signature="t",

1661

1981

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

1662

1982

* 1000)

1663

1983

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

1664

1984

1665

1985

# ApprovalDuration - property

1666

1986

@dbus_service_property(_interface,

1667

1987

signature="t",

1671

1991

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

1672

1992

* 1000)

1673

1993

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

1674

1994

1675

1995

# Name - property

1676

1996

@dbus_annotations(

1677

1997

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

1678

1998

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

1679

1999

def Name_dbus_property(self):

1680

2000

return dbus.String(self.name)

1681

2001

1682

2002

# Fingerprint - property

1683

2003

@dbus_annotations(

1684

2004

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

1685

2005

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

1686

2006

def Fingerprint_dbus_property(self):

1687

2007

return dbus.String(self.fingerprint)

1688

2008

1689

2009

# Host - property

1690

2010

@dbus_service_property(_interface,

1691

2011

signature="s",

1694

2014

if value is None: # get

1695

2015

return dbus.String(self.host)

1696

2016

self.host = str(value)

1697

2017

1698

2018

# Created - property

1699

2019

@dbus_annotations(

1700

2020

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

1701

2021

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

1702

2022

def Created_dbus_property(self):

1703

2023

return datetime_to_dbus(self.created)

1704

2024

1705

2025

# LastEnabled - property

1706

2026

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

1707

2027

def LastEnabled_dbus_property(self):

1708

2028

return datetime_to_dbus(self.last_enabled)

1709

2029

1710

2030

# Enabled - property

1711

2031

@dbus_service_property(_interface,

1712

2032

signature="b",

1718

2038

self.enable()

1719

2039

else:

1720

2040

self.disable()

1721

2041

1722

2042

# LastCheckedOK - property

1723

2043

@dbus_service_property(_interface,

1724

2044

signature="s",

1728

2048

self.checked_ok()

1729

2049

return

1730

2050

return datetime_to_dbus(self.last_checked_ok)

1731

2051

1732

2052

# LastCheckerStatus - property

1733

2053

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

1734

2054

def LastCheckerStatus_dbus_property(self):

1735

2055

return dbus.Int16(self.last_checker_status)

1736

2056

1737

2057

# Expires - property

1738

2058

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

1739

2059

def Expires_dbus_property(self):

1740

2060

return datetime_to_dbus(self.expires)

1741

2061

1742

2062

# LastApprovalRequest - property

1743

2063

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

1744

2064

def LastApprovalRequest_dbus_property(self):

1745

2065

return datetime_to_dbus(self.last_approval_request)

1746

2066

1747

2067

# Timeout - property

1748

2068

@dbus_service_property(_interface,

1749

2069

signature="t",

1764

2084

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

1765

2085

is None):

1766

2086

return

1767

gobject.source_remove(self.disable_initiator_tag)

1768

self.disable_initiator_tag = gobject.timeout_add(

2087

GLib.source_remove(self.disable_initiator_tag)

2088

self.disable_initiator_tag = GLib.timeout_add(

1769

2089

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

1770

2090

self.disable)

1771

2091

1772

2092

# ExtendedTimeout - property

1773

2093

@dbus_service_property(_interface,

1774

2094

signature="t",

1778

2098

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

1779

2099

* 1000)

1780

2100

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

1781

2101

1782

2102

# Interval - property

1783

2103

@dbus_service_property(_interface,

1784

2104

signature="t",

1791

2111

return

1792

2112

if self.enabled:

1793

2113

# Reschedule checker run

1794

gobject.source_remove(self.checker_initiator_tag)

1795

self.checker_initiator_tag = gobject.timeout_add(

2114

GLib.source_remove(self.checker_initiator_tag)

2115

self.checker_initiator_tag = GLib.timeout_add(

1796

2116

value, self.start_checker)

1797

self.start_checker() # Start one now, too

1798

2117

self.start_checker() # Start one now, too

2118

1799

2119

# Checker - property

1800

2120

@dbus_service_property(_interface,

1801

2121

signature="s",

1804

2124

if value is None: # get

1805

2125

return dbus.String(self.checker_command)

1806

2126

self.checker_command = str(value)

1807

2127

1808

2128

# CheckerRunning - property

1809

2129

@dbus_service_property(_interface,

1810

2130

signature="b",

1816

2136

self.start_checker()

1817

2137

else:

1818

2138

self.stop_checker()

1819

2139

1820

2140

# ObjectPath - property

1821

2141

@dbus_annotations(

1822

2142

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

1823

2143

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

1824

2144

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

1825

2145

def ObjectPath_dbus_property(self):

1826

return self.dbus_object_path # is already a dbus.ObjectPath

1827

2146

return self.dbus_object_path # is already a dbus.ObjectPath

2147

1828

2148

# Secret = property

1829

2149

@dbus_annotations(

1830

2150

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

1835

2155

byte_arrays=True)

1836

2156

def Secret_dbus_property(self, value):

1837

2157

self.secret = bytes(value)

1838

2158

1839

2159

del _interface

1840

2160

1841

2161

1845

2165

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

1846

2166

if not self._pipe.recv():

1847

2167

raise KeyError(fpr)

1848

2168

1849

2169

def __getattribute__(self, name):

1850

2170

if name == '_pipe':

1851

2171

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

1854

2174

if data[0] == 'data':

1855

2175

return data[1]

1856

2176

if data[0] == 'function':

1857

2177

1858

2178

def func(*args, **kwargs):

1859

2179

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

1860

2180

return self._pipe.recv()[1]

1861

2181

1862

2182

return func

1863

2183

1864

2184

def __setattr__(self, name, value):

1865

2185

if name == '_pipe':

1866

2186

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

1869

2189

1870

2190

class ClientHandler(socketserver.BaseRequestHandler, object):

1871

2191

"""A class to handle client connections.

1872

2192

1873

2193

Instantiated once for each connection to handle it.

1874

2194

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

1875

2195

1876

2196

def handle(self):

1877

2197

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

1878

2198

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

1879

2199

str(self.client_address))

1880

2200

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

1881

2201

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"))

2202

2203

session = gnutls.ClientSession(self.request)

2204

2205

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

2206

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

2207

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

2208

# "+DHE-DSS"))

1895

2209

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

1896

2210

priority = self.server.gnutls_priority

1897

2211

if priority is None:

1898

2212

priority = "NORMAL"

1899

gnutls.library.functions.gnutls_priority_set_direct(

1900

session._c_object, priority, None)

1901

2213

gnutls.priority_set_direct(session._c_object,

2214

priority.encode("utf-8"),

2215

None)

2216

1902

2217

# Start communication using the Mandos protocol

1903

2218

# Get protocol number

1904

2219

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

1909

2224

except (ValueError, IndexError, RuntimeError) as error:

1910

2225

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

1911

2226

return

1912

2227

1913

2228

# Start GnuTLS connection

1914

2229

try:

1915

2230

session.handshake()

1916

except gnutls.errors.GNUTLSError as error:

2231

except gnutls.Error as error:

1917

2232

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

1918

2233

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

1919

2234

# established. Just abandon the request.

1920

2235

return

1921

2236

logger.debug("Handshake succeeded")

1922

2237

1923

2238

approval_required = False

1924

2239

try:

1925

2240

try:

1926

2241

fpr = self.fingerprint(

1927

2242

self.peer_certificate(session))

1928

except (TypeError,

1929

gnutls.errors.GNUTLSError) as error:

2243

except (TypeError, gnutls.Error) as error:

1930

2244

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

1931

2245

return

1932

2246

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

1933

2247

1934

2248

try:

1935

2249

client = ProxyClient(child_pipe, fpr,

1936

2250

self.client_address)

1937

2251

except KeyError:

1938

2252

return

1939

2253

1940

2254

if client.approval_delay:

1941

2255

delay = client.approval_delay

1942

2256

client.approvals_pending += 1

1943

2257

approval_required = True

1944

2258

1945

2259

while True:

1946

2260

if not client.enabled:

1947

2261

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

1950

2264

# Emit D-Bus signal

1951

2265

client.Rejected("Disabled")

1952

2266

return

1953

2267

1954

2268

if client.approved or not client.approval_delay:

1955

#We are approved or approval is disabled

2269

# We are approved or approval is disabled

1956

2270

break

1957

2271

elif client.approved is None:

1958

2272

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

1969

2283

# Emit D-Bus signal

1970

2284

client.Rejected("Denied")

1971

2285

return

1972

1973

#wait until timeout or approved

2286

2287

# wait until timeout or approved

1974

2288

time = datetime.datetime.now()

1975

2289

client.changedstate.acquire()

1976

2290

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

1989

2303

break

1990

2304

else:

1991

2305

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

2306

2307

try:

2308

session.send(client.secret)

2309

except gnutls.Error as error:

2310

logger.warning("gnutls send failed",

2311

exc_info=error)

2312

return

2313

2006

2314

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

2007

2315

# bump the timeout using extended_timeout

2008

2316

client.bump_timeout(client.extended_timeout)

2009

2317

if self.server.use_dbus:

2010

2318

# Emit D-Bus signal

2011

2319

client.GotSecret()

2012

2320

2013

2321

finally:

2014

2322

if approval_required:

2015

2323

client.approvals_pending -= 1

2016

2324

try:

2017

2325

session.bye()

2018

except gnutls.errors.GNUTLSError as error:

2326

except gnutls.Error as error:

2019

2327

logger.warning("GnuTLS bye failed",

2020

2328

exc_info=error)

2021

2329

2022

2330

@staticmethod

2023

2331

def peer_certificate(session):

2024

2332

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

2025

2333

# 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

2334

if (gnutls.certificate_type_get(session._c_object)

2335

!= gnutls.CRT_OPENPGP):

2336

# ...return invalid data

2337

return b""

2031

2338

list_size = ctypes.c_uint(1)

2032

cert_list = (gnutls.library.functions

2033

.gnutls_certificate_get_peers

2339

cert_list = (gnutls.certificate_get_peers

2034

2340

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

2035

2341

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

2036

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

2037

" certificate")

2342

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

2038

2343

if list_size.value == 0:

2039

2344

return None

2040

2345

cert = cert_list[0]

2041

2346

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

2042

2347

2043

2348

@staticmethod

2044

2349

def fingerprint(openpgp):

2045

2350

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

2046

2351

# New GnuTLS "datum" with the OpenPGP public key

2047

datum = gnutls.library.types.gnutls_datum_t(

2352

datum = gnutls.datum_t(

2048

2353

ctypes.cast(ctypes.c_char_p(openpgp),

2049

2354

ctypes.POINTER(ctypes.c_ubyte)),

2050

2355

ctypes.c_uint(len(openpgp)))

2051

2356

# 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))

2357

crt = gnutls.openpgp_crt_t()

2358

gnutls.openpgp_crt_init(ctypes.byref(crt))

2055

2359

# 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)

2360

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

2361

gnutls.OPENPGP_FMT_RAW)

2059

2362

# Verify the self signature in the key

2060

2363

crtverify = ctypes.c_uint()

2061

gnutls.library.functions.gnutls_openpgp_crt_verify_self(

2062

crt, 0, ctypes.byref(crtverify))

2364

gnutls.openpgp_crt_verify_self(crt, 0,

2365

ctypes.byref(crtverify))

2063

2366

if crtverify.value != 0:

2064

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2065

raise gnutls.errors.CertificateSecurityError(

2066

"Verify failed")

2367

gnutls.openpgp_crt_deinit(crt)

2368

raise gnutls.CertificateSecurityError(code

2369

=crtverify.value)

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: