/mandos/trunk : revision 785

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#!/usr/bin/python

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#!/usr/bin/python2.7

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# -*- mode: python; coding: utf-8 -*-

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#

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#

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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 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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#

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

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#

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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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# 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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try:

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from future_builtins import *

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except ImportError:

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pass

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from future_builtins import *

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try:

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import SocketServer as socketserver

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import argparse

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import datetime

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import errno

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import gnutls.crypto

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import gnutls.connection

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import gnutls.errors

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import gnutls.library.functions

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import gnutls.library.constants

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import gnutls.library.types

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try:

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import ConfigParser as configparser

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except ImportError:

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import dbus

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import dbus.service

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from gi.repository import GLib

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try:

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import gobject

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except ImportError:

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from gi.repository import GObject as gobject

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import avahi

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from dbus.mainloop.glib import DBusGMainLoop

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import ctypes

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import ctypes.util

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import xml.dom.minidom

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import inspect

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# Try to find the value of SO_BINDTODEVICE:

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try:

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

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

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except AttributeError:

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try:

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# This is where SO_BINDTODEVICE was up to and including Python

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# 2.6, and also 3.2:

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from IN import SO_BINDTODEVICE

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except ImportError:

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

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# Try running the C preprocessor:

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try:

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

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"/dev/stdin"],

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stdin=subprocess.PIPE,

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stdout=subprocess.PIPE)

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stdout = cc.communicate(

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

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

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except (OSError, ValueError, IndexError):

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# No value found

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SO_BINDTODEVICE = None

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SO_BINDTODEVICE = None

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if sys.version_info.major == 2:

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str = unicode

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version = "1.7.20"

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version = "1.6.9"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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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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'--homedir', self.tempdir,

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'--home', self.tempdir,

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'--force-mdc',

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'--quiet']

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

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

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

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'--quiet',

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'--no-use-agent']

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def __enter__(self):

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return self

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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([self.gpg, '--symmetric',

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proc = subprocess.Popen(['gpg', '--symmetric',

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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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([self.gpg, '--decrypt',

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proc = subprocess.Popen(['gpg', '--decrypt',

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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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"""

425

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

426

359

427

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if state == avahi.ENTRY_GROUP_ESTABLISHED:

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logger.debug("Zeroconf service established.")

429

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elif state == avahi.ENTRY_GROUP_COLLISION:

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

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str(error))

435

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

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:

481

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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"""

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if self.server is None:

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429

class AvahiServiceToSyslog(AvahiService):

497

430

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

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

499

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

432

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

500

433

syslogger.setFormatter(logging.Formatter(

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

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.format(self.name)))

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return ret

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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

_tls_rawpk_version = b"3.6.6"

518

519

def __init__(self):

520

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

521

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

522

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

523

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

524

.format(self._need_version))

525

526

# Unless otherwise indicated, the constants and types below are

527

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

528

529

# Constants

530

E_SUCCESS = 0

531

E_INTERRUPTED = -52

532

E_AGAIN = -28

533

CRT_OPENPGP = 2

534

CRT_RAWPK = 3

535

CLIENT = 2

536

SHUT_RDWR = 0

537

CRD_CERTIFICATE = 1

538

E_NO_CERTIFICATE_FOUND = -49

539

X509_FMT_DER = 0

540

NO_TICKETS = 1<<10

541

ENABLE_RAWPK = 1<<18

542

CTYPE_PEERS = 3

543

KEYID_USE_SHA256 = 1 # gnutls/x509.h

544

OPENPGP_FMT_RAW = 0 # gnutls/openpgp.h

545

546

# Types

547

class session_int(ctypes.Structure):

548

_fields_ = []

549

session_t = ctypes.POINTER(session_int)

550

551

class certificate_credentials_st(ctypes.Structure):

552

_fields_ = []

553

certificate_credentials_t = ctypes.POINTER(

554

certificate_credentials_st)

555

certificate_type_t = ctypes.c_int

556

557

class datum_t(ctypes.Structure):

558

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

559

('size', ctypes.c_uint)]

560

561

class openpgp_crt_int(ctypes.Structure):

562

_fields_ = []

563

openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)

564

openpgp_crt_fmt_t = ctypes.c_int # gnutls/openpgp.h

565

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

566

credentials_type_t = ctypes.c_int

567

transport_ptr_t = ctypes.c_void_p

568

close_request_t = ctypes.c_int

569

570

# Exceptions

571

class Error(Exception):

572

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

573

# exception might be raised from within GnuTLS.__init__,

574

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

575

# global variable has happened.

576

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

577

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

578

# code is passed, convert it to a string with

579

# gnutls.strerror()

580

self.code = code

581

if message is None and code is not None:

582

message = GnuTLS.strerror(code)

583

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

584

message, *args)

585

586

class CertificateSecurityError(Error):

587

pass

588

589

# Classes

590

class Credentials(object):

591

def __init__(self):

592

self._c_object = gnutls.certificate_credentials_t()

593

gnutls.certificate_allocate_credentials(

594

ctypes.byref(self._c_object))

595

self.type = gnutls.CRD_CERTIFICATE

596

597

def __del__(self):

598

gnutls.certificate_free_credentials(self._c_object)

599

600

class ClientSession(object):

601

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

602

self._c_object = gnutls.session_t()

603

gnutls_flags = gnutls.CLIENT

604

if gnutls.check_version("3.5.6"):

605

gnutls_flags |= gnutls.NO_TICKETS

606

if gnutls.has_rawpk:

607

gnutls_flags |= gnutls.ENABLE_RAWPK

608

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

609

del gnutls_flags

610

gnutls.set_default_priority(self._c_object)

611

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

612

gnutls.handshake_set_private_extensions(self._c_object,

613

True)

614

self.socket = socket

615

if credentials is None:

616

credentials = gnutls.Credentials()

617

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

618

ctypes.cast(credentials._c_object,

619

ctypes.c_void_p))

620

self.credentials = credentials

621

622

def __del__(self):

623

gnutls.deinit(self._c_object)

624

625

def handshake(self):

626

return gnutls.handshake(self._c_object)

627

628

def send(self, data):

629

data = bytes(data)

630

data_len = len(data)

631

while data_len > 0:

632

data_len -= gnutls.record_send(self._c_object,

633

data[-data_len:],

634

data_len)

635

636

def bye(self):

637

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

638

639

# Error handling functions

640

def _error_code(result):

641

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

642

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

643

if result >= 0:

644

return result

645

if result == gnutls.E_NO_CERTIFICATE_FOUND:

646

raise gnutls.CertificateSecurityError(code=result)

647

raise gnutls.Error(code=result)

648

649

def _retry_on_error(result, func, arguments):

650

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

651

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

652

while result < 0:

653

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

654

return _error_code(result)

655

result = func(*arguments)

656

return result

657

658

# Unless otherwise indicated, the function declarations below are

659

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

660

661

# Functions

662

priority_set_direct = _library.gnutls_priority_set_direct

663

priority_set_direct.argtypes = [session_t, ctypes.c_char_p,

664

ctypes.POINTER(ctypes.c_char_p)]

665

priority_set_direct.restype = _error_code

666

667

init = _library.gnutls_init

668

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

669

init.restype = _error_code

670

671

set_default_priority = _library.gnutls_set_default_priority

672

set_default_priority.argtypes = [session_t]

673

set_default_priority.restype = _error_code

674

675

record_send = _library.gnutls_record_send

676

record_send.argtypes = [session_t, ctypes.c_void_p,

677

ctypes.c_size_t]

678

record_send.restype = ctypes.c_ssize_t

679

record_send.errcheck = _retry_on_error

680

681

certificate_allocate_credentials = (

682

_library.gnutls_certificate_allocate_credentials)

683

certificate_allocate_credentials.argtypes = [

684

ctypes.POINTER(certificate_credentials_t)]

685

certificate_allocate_credentials.restype = _error_code

686

687

certificate_free_credentials = (

688

_library.gnutls_certificate_free_credentials)

689

certificate_free_credentials.argtypes = [

690

certificate_credentials_t]

691

certificate_free_credentials.restype = None

692

693

handshake_set_private_extensions = (

694

_library.gnutls_handshake_set_private_extensions)

695

handshake_set_private_extensions.argtypes = [session_t,

696

ctypes.c_int]

697

handshake_set_private_extensions.restype = None

698

699

credentials_set = _library.gnutls_credentials_set

700

credentials_set.argtypes = [session_t, credentials_type_t,

701

ctypes.c_void_p]

702

credentials_set.restype = _error_code

703

704

strerror = _library.gnutls_strerror

705

strerror.argtypes = [ctypes.c_int]

706

strerror.restype = ctypes.c_char_p

707

708

certificate_type_get = _library.gnutls_certificate_type_get

709

certificate_type_get.argtypes = [session_t]

710

certificate_type_get.restype = _error_code

711

712

certificate_get_peers = _library.gnutls_certificate_get_peers

713

certificate_get_peers.argtypes = [session_t,

714

ctypes.POINTER(ctypes.c_uint)]

715

certificate_get_peers.restype = ctypes.POINTER(datum_t)

716

717

global_set_log_level = _library.gnutls_global_set_log_level

718

global_set_log_level.argtypes = [ctypes.c_int]

719

global_set_log_level.restype = None

720

721

global_set_log_function = _library.gnutls_global_set_log_function

722

global_set_log_function.argtypes = [log_func]

723

global_set_log_function.restype = None

724

725

deinit = _library.gnutls_deinit

726

deinit.argtypes = [session_t]

727

deinit.restype = None

728

729

handshake = _library.gnutls_handshake

730

handshake.argtypes = [session_t]

731

handshake.restype = _error_code

732

handshake.errcheck = _retry_on_error

733

734

transport_set_ptr = _library.gnutls_transport_set_ptr

735

transport_set_ptr.argtypes = [session_t, transport_ptr_t]

736

transport_set_ptr.restype = None

737

738

bye = _library.gnutls_bye

739

bye.argtypes = [session_t, close_request_t]

740

bye.restype = _error_code

741

bye.errcheck = _retry_on_error

742

743

check_version = _library.gnutls_check_version

744

check_version.argtypes = [ctypes.c_char_p]

745

check_version.restype = ctypes.c_char_p

746

747

has_rawpk = bool(check_version(_tls_rawpk_version))

748

749

if has_rawpk:

750

# Types

751

class pubkey_st(ctypes.Structure):

752

_fields = []

753

pubkey_t = ctypes.POINTER(pubkey_st)

754

755

x509_crt_fmt_t = ctypes.c_int

756

757

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

758

pubkey_init = _library.gnutls_pubkey_init

759

pubkey_init.argtypes = [ctypes.POINTER(pubkey_t)]

760

pubkey_init.restype = _error_code

761

762

pubkey_import = _library.gnutls_pubkey_import

763

pubkey_import.argtypes = [pubkey_t, ctypes.POINTER(datum_t),

764

x509_crt_fmt_t]

765

pubkey_import.restype = _error_code

766

767

pubkey_get_key_id = _library.gnutls_pubkey_get_key_id

768

pubkey_get_key_id.argtypes = [pubkey_t, ctypes.c_int,

769

ctypes.POINTER(ctypes.c_ubyte),

770

ctypes.POINTER(ctypes.c_size_t)]

771

pubkey_get_key_id.restype = _error_code

772

773

pubkey_deinit = _library.gnutls_pubkey_deinit

774

pubkey_deinit.argtypes = [pubkey_t]

775

pubkey_deinit.restype = None

776

else:

777

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

778

779

openpgp_crt_init = _library.gnutls_openpgp_crt_init

780

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

781

openpgp_crt_init.restype = _error_code

782

783

openpgp_crt_import = _library.gnutls_openpgp_crt_import

784

openpgp_crt_import.argtypes = [openpgp_crt_t,

785

ctypes.POINTER(datum_t),

786

openpgp_crt_fmt_t]

787

openpgp_crt_import.restype = _error_code

788

789

openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self

790

openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,

791

ctypes.POINTER(ctypes.c_uint)]

792

openpgp_crt_verify_self.restype = _error_code

793

794

openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit

795

openpgp_crt_deinit.argtypes = [openpgp_crt_t]

796

openpgp_crt_deinit.restype = None

797

798

openpgp_crt_get_fingerprint = (

799

_library.gnutls_openpgp_crt_get_fingerprint)

800

openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,

801

ctypes.c_void_p,

802

ctypes.POINTER(

803

ctypes.c_size_t)]

804

openpgp_crt_get_fingerprint.restype = _error_code

805

806

if check_version("3.6.4"):

807

certificate_type_get2 = _library.gnutls_certificate_type_get2

808

certificate_type_get2.argtypes = [session_t, ctypes.c_int]

809

certificate_type_get2.restype = _error_code

810

811

# Remove non-public functions

812

del _error_code, _retry_on_error

813

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

814

gnutls = GnuTLS()

815

816

817

438

def call_pipe(connection, # : multiprocessing.Connection

818

439

func, *args, **kwargs):

819

440

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

820

441

821

442

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

822

443

return value on the provided multiprocessing.Connection.

823

444

"""

824

445

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

825

446

connection.close()

826

447

827

828

448

class Client(object):

829

449

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

830

450

831

451

Attributes:

832

452

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

833

453

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

835

455

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

836

456

to see if the client lives.

837

457

'None' if no process is running.

838

checker_callback_tag: a GLib event source tag, or None

458

checker_callback_tag: a gobject event source tag, or None

839

459

checker_command: string; External command which is run to check

840

460

if client lives. %() expansions are done at

841

461

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

842

462

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

843

checker_initiator_tag: a GLib event source tag, or None

463

checker_initiator_tag: a gobject event source tag, or None

844

464

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

845

465

client_structure: Object describing what attributes a client has

846

466

and is used for storing the client at exit

847

467

current_checker_command: string; current running checker_command

848

disable_initiator_tag: a GLib event source tag, or None

468

disable_initiator_tag: a gobject event source tag, or None

849

469

enabled: bool()

850

470

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

851

uniquely identify an OpenPGP client

852

key_id: string (64 hexadecimal digits); used to uniquely identify

853

a client using raw public keys

471

uniquely identify the client

854

472

host: string; available for use by the checker command

855

473

interval: datetime.timedelta(); How often to start a new checker

856

474

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

872

490

disabled, or None

873

491

server_settings: The server_settings dict from main()

874

492

"""

875

493

876

494

runtime_expansions = ("approval_delay", "approval_duration",

877

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

495

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

878

496

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

879

497

"last_approval_request", "last_checked_ok",

880

498

"last_enabled", "name", "timeout")

889

507

"approved_by_default": "True",

890

508

"enabled": "True",

891

509

}

892

510

893

511

@staticmethod

894

512

def config_parser(config):

895

513

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

902

520

for client_name in config.sections():

903

521

section = dict(config.items(client_name))

904

522

client = settings[client_name] = {}

905

523

906

524

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

907

525

# Reformat values from string types to Python types

908

526

client["approved_by_default"] = config.getboolean(

909

527

client_name, "approved_by_default")

910

528

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

911

529

"enabled")

912

913

# Uppercase and remove spaces from key_id and fingerprint

914

# for later comparison purposes with return value from the

915

# key_id() and fingerprint() functions

916

client["key_id"] = (section.get("key_id", "").upper()

917

.replace(" ", ""))

530

531

# Uppercase and remove spaces from fingerprint for later

532

# comparison purposes with return value from the

533

# fingerprint() function

918

534

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

919

535

.replace(" ", ""))

920

536

if "secret" in section:

921

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

922

.encode("utf-8"),

923

"base64")

537

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

924

538

elif "secfile" in section:

925

539

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

926

540

(section["secfile"])),

941

555

client["last_approval_request"] = None

942

556

client["last_checked_ok"] = None

943

557

client["last_checker_status"] = -2

944

558

945

559

return settings

946

947

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

560

561

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

948

562

self.name = name

949

563

if server_settings is None:

950

564

server_settings = {}

952

566

# adding all client settings

953

567

for setting, value in settings.items():

954

568

setattr(self, setting, value)

955

569

956

570

if self.enabled:

957

571

if not hasattr(self, "last_enabled"):

958

572

self.last_enabled = datetime.datetime.utcnow()

962

576

else:

963

577

self.last_enabled = None

964

578

self.expires = None

965

579

966

580

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

967

logger.debug(" Key ID: %s", self.key_id)

968

581

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

969

582

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

970

583

datetime.datetime.utcnow())

971

584

972

585

# attributes specific for this server instance

973

586

self.checker = None

974

587

self.checker_initiator_tag = None

980

593

self.changedstate = multiprocessing_manager.Condition(

981

594

multiprocessing_manager.Lock())

982

595

self.client_structure = [attr

983

for attr in self.__dict__.keys()

596

for attr in self.__dict__.iterkeys()

984

597

if not attr.startswith("_")]

985

598

self.client_structure.append("client_structure")

986

599

987

600

for name, t in inspect.getmembers(

988

601

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

989

602

if not name.startswith("_"):

990

603

self.client_structure.append(name)

991

604

992

605

# Send notice to process children that client state has changed

993

606

def send_changedstate(self):

994

607

with self.changedstate:

995

608

self.changedstate.notify_all()

996

609

997

610

def enable(self):

998

611

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

999

612

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

1004

617

self.last_enabled = datetime.datetime.utcnow()

1005

618

self.init_checker()

1006

619

self.send_changedstate()

1007

620

1008

621

def disable(self, quiet=True):

1009

622

"""Disable this client."""

1010

623

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

1012

625

if not quiet:

1013

626

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

1014

627

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

1015

GLib.source_remove(self.disable_initiator_tag)

628

gobject.source_remove(self.disable_initiator_tag)

1016

629

self.disable_initiator_tag = None

1017

630

self.expires = None

1018

631

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

1019

GLib.source_remove(self.checker_initiator_tag)

632

gobject.source_remove(self.checker_initiator_tag)

1020

633

self.checker_initiator_tag = None

1021

634

self.stop_checker()

1022

635

self.enabled = False

1023

636

if not quiet:

1024

637

self.send_changedstate()

1025

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

638

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

1026

639

return False

1027

640

1028

641

def __del__(self):

1029

642

self.disable()

1030

643

1031

644

def init_checker(self):

1032

645

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

1033

646

# and every interval from then on.

1034

647

if self.checker_initiator_tag is not None:

1035

GLib.source_remove(self.checker_initiator_tag)

1036

self.checker_initiator_tag = GLib.timeout_add(

648

gobject.source_remove(self.checker_initiator_tag)

649

self.checker_initiator_tag = gobject.timeout_add(

1037

650

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

1038

651

self.start_checker)

1039

652

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

1040

653

if self.disable_initiator_tag is not None:

1041

GLib.source_remove(self.disable_initiator_tag)

1042

self.disable_initiator_tag = GLib.timeout_add(

654

gobject.source_remove(self.disable_initiator_tag)

655

self.disable_initiator_tag = gobject.timeout_add(

1043

656

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

1044

657

# Also start a new checker *right now*.

1045

658

self.start_checker()

1046

659

1047

660

def checker_callback(self, source, condition, connection,

1048

661

command):

1049

662

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

1052

665

# Read return code from connection (see call_pipe)

1053

666

returncode = connection.recv()

1054

667

connection.close()

1055

668

1056

669

if returncode >= 0:

1057

670

self.last_checker_status = returncode

1058

671

self.last_checker_signal = None

1068

681

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

1069

682

vars(self))

1070

683

return False

1071

684

1072

685

def checked_ok(self):

1073

686

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

1074

687

self.last_checked_ok = datetime.datetime.utcnow()

1075

688

self.last_checker_status = 0

1076

689

self.last_checker_signal = None

1077

690

self.bump_timeout()

1078

691

1079

692

def bump_timeout(self, timeout=None):

1080

693

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

1081

694

if timeout is None:

1082

695

timeout = self.timeout

1083

696

if self.disable_initiator_tag is not None:

1084

GLib.source_remove(self.disable_initiator_tag)

697

gobject.source_remove(self.disable_initiator_tag)

1085

698

self.disable_initiator_tag = None

1086

699

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

1087

self.disable_initiator_tag = GLib.timeout_add(

700

self.disable_initiator_tag = gobject.timeout_add(

1088

701

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

1089

702

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

1090

703

1091

704

def need_approval(self):

1092

705

self.last_approval_request = datetime.datetime.utcnow()

1093

706

1094

707

def start_checker(self):

1095

708

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

1096

709

1097

710

If a checker already exists, leave it running and do

1098

711

nothing."""

1099

712

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

1104

717

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

1105

718

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

1106

719

# should be.

1107

720

1108

721

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

1109

722

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

1110

723

self.checker.join()

1114

727

# Escape attributes for the shell

1115

728

escaped_attrs = {

1116

729

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

1117

for attr in self.runtime_expansions}

730

for attr in self.runtime_expansions }

1118

731

try:

1119

732

command = self.checker_command % escaped_attrs

1120

733

except TypeError as error:

1132

745

# The exception is when not debugging but nevertheless

1133

746

# running in the foreground; use the previously

1134

747

# created wnull.

1135

popen_args = {"close_fds": True,

1136

"shell": True,

1137

"cwd": "/"}

748

popen_args = { "close_fds": True,

749

"shell": True,

750

"cwd": "/" }

1138

751

if (not self.server_settings["debug"]

1139

752

and self.server_settings["foreground"]):

1140

753

popen_args.update({"stdout": wnull,

1141

"stderr": wnull})

1142

pipe = multiprocessing.Pipe(duplex=False)

754

"stderr": wnull })

755

pipe = multiprocessing.Pipe(duplex = False)

1143

756

self.checker = multiprocessing.Process(

1144

target=call_pipe,

1145

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

1146

kwargs=popen_args)

757

target = call_pipe,

758

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

759

kwargs = popen_args)

1147

760

self.checker.start()

1148

self.checker_callback_tag = GLib.io_add_watch(

1149

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

761

self.checker_callback_tag = gobject.io_add_watch(

762

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

1150

763

self.checker_callback, pipe[0], command)

1151

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

764

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

1152

765

return True

1153

766

1154

767

def stop_checker(self):

1155

768

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

1156

769

if self.checker_callback_tag:

1157

GLib.source_remove(self.checker_callback_tag)

770

gobject.source_remove(self.checker_callback_tag)

1158

771

self.checker_callback_tag = None

1159

772

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

1160

773

return

1169

782

byte_arrays=False):

1170

783

"""Decorators for marking methods of a DBusObjectWithProperties to

1171

784

become properties on the D-Bus.

1172

785

1173

786

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

1174

787

and with one argument by "Set".

1175

788

1176

789

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

1177

790

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

1178

791

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

1182

795

if byte_arrays and signature != "ay":

1183

796

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

1184

797

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

1185

798

1186

799

def decorator(func):

1187

800

func._dbus_is_property = True

1188

801

func._dbus_interface = dbus_interface

1191

804

func._dbus_name = func.__name__

1192

805

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

1193

806

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

1194

func._dbus_get_args_options = {'byte_arrays': byte_arrays}

807

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

1195

808

return func

1196

809

1197

810

return decorator

1198

811

1199

812

1200

813

def dbus_interface_annotations(dbus_interface):

1201

814

"""Decorator for marking functions returning interface annotations

1202

815

1203

816

Usage:

1204

817

1205

818

@dbus_interface_annotations("org.example.Interface")

1206

819

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

1207

820

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

1208

821

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

1209

822

"false"}

1210

823

"""

1211

824

1212

825

def decorator(func):

1213

826

func._dbus_is_interface = True

1214

827

func._dbus_interface = dbus_interface

1215

828

func._dbus_name = dbus_interface

1216

829

return func

1217

830

1218

831

return decorator

1219

832

1220

833

1221

834

def dbus_annotations(annotations):

1222

835

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

1223

836

Usage:

1224

837

1225

838

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

1226

839

"org.freedesktop.DBus.Property."

1227

840

"EmitsChangedSignal": "false"})

1229

842

access="r")

1230

843

def Property_dbus_property(self):

1231

844

return dbus.Boolean(False)

1232

845

1233

846

See also the DBusObjectWithAnnotations class.

1234

847

"""

1235

848

1236

849

def decorator(func):

1237

850

func._dbus_annotations = annotations

1238

851

return func

1239

852

1240

853

return decorator

1241

854

1242

855

1260

873

1261

874

class DBusObjectWithAnnotations(dbus.service.Object):

1262

875

"""A D-Bus object with annotations.

1263

876

1264

877

Classes inheriting from this can use the dbus_annotations

1265

878

decorator to add annotations to methods or signals.

1266

879

"""

1267

880

1268

881

@staticmethod

1269

882

def _is_dbus_thing(thing):

1270

883

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

1271

884

1272

885

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

1273

886

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

1274

887

"""

1275

888

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

1276

889

False)

1277

890

1278

891

def _get_all_dbus_things(self, thing):

1279

892

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

1280

893

"""

1283

896

for cls in self.__class__.__mro__

1284

897

for name, athing in

1285

898

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

1286

899

1287

900

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1288

out_signature="s",

1289

path_keyword='object_path',

1290

connection_keyword='connection')

901

out_signature = "s",

902

path_keyword = 'object_path',

903

connection_keyword = 'connection')

1291

904

def Introspect(self, object_path, connection):

1292

905

"""Overloading of standard D-Bus method.

1293

906

1294

907

Inserts annotation tags on methods and signals.

1295

908

"""

1296

909

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

1297

910

connection)

1298

911

try:

1299

912

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

1300

913

1301

914

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

1302

915

# Add annotation tags

1303

916

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

1330

943

if_tag.appendChild(ann_tag)

1331

944

# Fix argument name for the Introspect method itself

1332

945

if (if_tag.getAttribute("name")

1333

== dbus.INTROSPECTABLE_IFACE):

946

== dbus.INTROSPECTABLE_IFACE):

1334

947

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

1335

948

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

1336

949

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

1349

962

1350

963

class DBusObjectWithProperties(DBusObjectWithAnnotations):

1351

964

"""A D-Bus object with properties.

1352

965

1353

966

Classes inheriting from this can use the dbus_service_property

1354

967

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

1355

968

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

1356

969

"""

1357

970

1358

971

def _get_dbus_property(self, interface_name, property_name):

1359

972

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

1360

973

property with the specified name and interface.

1365

978

if (value._dbus_name == property_name

1366

979

and value._dbus_interface == interface_name):

1367

980

return value.__get__(self)

1368

981

1369

982

# No such property

1370

983

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

1371

984

self.dbus_object_path, interface_name, property_name))

1372

985

1373

986

@classmethod

1374

987

def _get_all_interface_names(cls):

1375

988

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

1378

991

for x in (inspect.getmro(cls))

1379

992

for attr in dir(x))

1380

993

if name is not None)

1381

994

1382

995

@dbus.service.method(dbus.PROPERTIES_IFACE,

1383

996

in_signature="ss",

1384

997

out_signature="v")

1392

1005

if not hasattr(value, "variant_level"):

1393

1006

return value

1394

1007

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

1395

1008

1396

1009

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

1397

1010

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

1398

1011

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

1410

1023

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

1411

1024

for byte in value))

1412

1025

prop(value)

1413

1026

1414

1027

@dbus.service.method(dbus.PROPERTIES_IFACE,

1415

1028

in_signature="s",

1416

1029

out_signature="a{sv}")

1417

1030

def GetAll(self, interface_name):

1418

1031

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

1419

1032

standard.

1420

1033

1421

1034

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

1422

1035

"""

1423

1036

properties = {}

1434

1047

properties[name] = value

1435

1048

continue

1436

1049

properties[name] = type(value)(

1437

value, variant_level=value.variant_level + 1)

1050

value, variant_level = value.variant_level + 1)

1438

1051

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

1439

1052

1440

1053

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

1441

1054

def PropertiesChanged(self, interface_name, changed_properties,

1442

1055

invalidated_properties):

1444

1057

standard.

1445

1058

"""

1446

1059

pass

1447

1060

1448

1061

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1449

1062

out_signature="s",

1450

1063

path_keyword='object_path',

1451

1064

connection_keyword='connection')

1452

1065

def Introspect(self, object_path, connection):

1453

1066

"""Overloading of standard D-Bus method.

1454

1067

1455

1068

Inserts property tags and interface annotation tags.

1456

1069

"""

1457

1070

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1459

1072

connection)

1460

1073

try:

1461

1074

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

1462

1075

1463

1076

def make_tag(document, name, prop):

1464

1077

e = document.createElement("property")

1465

1078

e.setAttribute("name", name)

1466

1079

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

1467

1080

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

1468

1081

return e

1469

1082

1470

1083

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

1471

1084

# Add property tags

1472

1085

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

1514

1127

exc_info=error)

1515

1128

return xmlstring

1516

1129

1517

1518

1130

try:

1519

1131

dbus.OBJECT_MANAGER_IFACE

1520

1132

except AttributeError:

1521

1133

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

1522

1134

1523

1524

1135

class DBusObjectWithObjectManager(DBusObjectWithAnnotations):

1525

1136

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

1526

1137

1527

1138

Classes inheriting from this exposes the standard

1528

1139

GetManagedObjects call and the InterfacesAdded and

1529

1140

InterfacesRemoved signals on the standard

1530

1141

"org.freedesktop.DBus.ObjectManager" interface.

1531

1142

1532

1143

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

1533

1144

manually.

1534

1145

"""

1535

1146

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

1536

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

1147

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

1537

1148

def GetManagedObjects(self):

1538

1149

"""This function must be overridden"""

1539

1150

raise NotImplementedError()

1540

1151

1541

1152

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,

1542

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

1153

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

1543

1154

def InterfacesAdded(self, object_path, interfaces_and_properties):

1544

1155

pass

1545

1546

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

1156

1157

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,

1158

signature = "oas")

1547

1159

def InterfacesRemoved(self, object_path, interfaces):

1548

1160

pass

1549

1161

1550

1162

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1551

out_signature="s",

1552

path_keyword='object_path',

1553

connection_keyword='connection')

1163

out_signature = "s",

1164

path_keyword = 'object_path',

1165

connection_keyword = 'connection')

1554

1166

def Introspect(self, object_path, connection):

1555

1167

"""Overloading of standard D-Bus method.

1556

1168

1557

1169

Override return argument name of GetManagedObjects to be

1558

1170

"objpath_interfaces_and_properties"

1559

1171

"""

1560

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1561

object_path,

1562

connection)

1172

xmlstring = DBusObjectWithAnnotations(self, object_path,

1173

connection)

1563

1174

try:

1564

1175

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

1565

1176

1566

1177

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

1567

1178

# Fix argument name for the GetManagedObjects method

1568

1179

if (if_tag.getAttribute("name")

1569

== dbus.OBJECT_MANAGER_IFACE):

1180

== dbus.OBJECT_MANAGER_IFACE):

1570

1181

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

1571

1182

if (cn.getAttribute("name")

1572

1183

== "GetManagedObjects"):

1582

1193

except (AttributeError, xml.dom.DOMException,

1583

1194

xml.parsers.expat.ExpatError) as error:

1584

1195

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

1585

exc_info=error)

1196

exc_info = error)

1586

1197

return xmlstring

1587

1198

1588

1589

1199

def datetime_to_dbus(dt, variant_level=0):

1590

1200

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

1591

1201

if dt is None:

1592

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

1202

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

1593

1203

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

1594

1204

1595

1205

1598

1208

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

1599

1209

interface names according to the "alt_interface_names" mapping.

1600

1210

Usage:

1601

1211

1602

1212

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

1603

1213

"net.example.AlternateInterface"})

1604

1214

class SampleDBusObject(dbus.service.Object):

1605

1215

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

1606

1216

def SampleDBusMethod():

1607

1217

pass

1608

1218

1609

1219

The above "SampleDBusMethod" on "SampleDBusObject" will be

1610

1220

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

1611

1221

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

1612

1222

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

1613

1223

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

1614

1224

1615

1225

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

1616

1226

(from DBusObjectWithProperties) and interfaces (from the

1617

1227

dbus_interface_annotations decorator).

1618

1228

"""

1619

1229

1620

1230

def wrapper(cls):

1621

1231

for orig_interface_name, alt_interface_name in (

1622

1232

alt_interface_names.items()):

1637

1247

interface_names.add(alt_interface)

1638

1248

# Is this a D-Bus signal?

1639

1249

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

1640

# Extract the original non-method undecorated

1641

# function by black magic

1642

1250

if sys.version_info.major == 2:

1251

# Extract the original non-method undecorated

1252

# function by black magic

1643

1253

nonmethod_func = (dict(

1644

1254

zip(attribute.func_code.co_freevars,

1645

1255

attribute.__closure__))

1646

1256

["func"].cell_contents)

1647

1257

else:

1648

nonmethod_func = (dict(

1649

zip(attribute.__code__.co_freevars,

1650

attribute.__closure__))

1651

["func"].cell_contents)

1258

nonmethod_func = attribute

1652

1259

# Create a new, but exactly alike, function

1653

1260

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

1654

1261

# with the alternate D-Bus interface name

1655

new_function = copy_function(nonmethod_func)

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__)

1656

1276

new_function = (dbus.service.signal(

1657

1277

alt_interface,

1658

1278

attribute._dbus_signature)(new_function))

1662

1282

attribute._dbus_annotations)

1663

1283

except AttributeError:

1664

1284

pass

1665

1666

1285

# Define a creator of a function to call both the

1667

1286

# original and alternate functions, so both the

1668

1287

# original and alternate signals gets sent when

1671

1290

"""This function is a scope container to pass

1672

1291

func1 and func2 to the "call_both" function

1673

1292

outside of its arguments"""

1674

1675

@functools.wraps(func2)

1293

1676

1294

def call_both(*args, **kwargs):

1677

1295

"""This function will emit two D-Bus

1678

1296

signals by calling func1 and func2"""

1679

1297

func1(*args, **kwargs)

1680

1298

func2(*args, **kwargs)

1681

# Make wrapper function look like a D-Bus

1682

# signal

1683

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

1684

if name.startswith("_dbus_"):

1685

setattr(call_both, name, attr)

1686

1299

1687

1300

return call_both

1688

1301

# Create the "call_both" function and add it to

1689

1302

# the class

1699

1312

alt_interface,

1700

1313

attribute._dbus_in_signature,

1701

1314

attribute._dbus_out_signature)

1702

(copy_function(attribute)))

1315

(types.FunctionType(attribute.func_code,

1316

attribute.func_globals,

1317

attribute.func_name,

1318

attribute.func_defaults,

1319

attribute.func_closure)))

1703

1320

# Copy annotations, if any

1704

1321

try:

1705

1322

attr[attrname]._dbus_annotations = dict(

1717

1334

attribute._dbus_access,

1718

1335

attribute._dbus_get_args_options

1719

1336

["byte_arrays"])

1720

(copy_function(attribute)))

1337

(types.FunctionType(

1338

attribute.func_code,

1339

attribute.func_globals,

1340

attribute.func_name,

1341

attribute.func_defaults,

1342

attribute.func_closure)))

1721

1343

# Copy annotations, if any

1722

1344

try:

1723

1345

attr[attrname]._dbus_annotations = dict(

1732

1354

# to the class.

1733

1355

attr[attrname] = (

1734

1356

dbus_interface_annotations(alt_interface)

1735

(copy_function(attribute)))

1357

(types.FunctionType(attribute.func_code,

1358

attribute.func_globals,

1359

attribute.func_name,

1360

attribute.func_defaults,

1361

attribute.func_closure)))

1736

1362

if deprecate:

1737

1363

# Deprecate all alternate interfaces

1738

iname = "_AlternateDBusNames_interface_annotation{}"

1364

iname="_AlternateDBusNames_interface_annotation{}"

1739

1365

for interface_name in interface_names:

1740

1366

1741

1367

@dbus_interface_annotations(interface_name)

1742

1368

def func(self):

1743

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

1744

"true"}

1369

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

1370

"true" }

1745

1371

# Find an unused name

1746

1372

for aname in (iname.format(i)

1747

1373

for i in itertools.count()):

1751

1377

if interface_names:

1752

1378

# Replace the class with a new subclass of it with

1753

1379

# methods, signals, etc. as created above.

1754

if sys.version_info.major == 2:

1755

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

1756

(cls, ), attr)

1757

else:

1758

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

1759

(cls, ), attr)

1380

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

1381

(cls, ), attr)

1760

1382

return cls

1761

1383

1762

1384

return wrapper

1763

1385

1764

1386

1766

1388

"se.bsnet.fukt.Mandos"})

1767

1389

class ClientDBus(Client, DBusObjectWithProperties):

1768

1390

"""A Client class using D-Bus

1769

1391

1770

1392

Attributes:

1771

1393

dbus_object_path: dbus.ObjectPath

1772

1394

bus: dbus.SystemBus()

1773

1395

"""

1774

1396

1775

1397

runtime_expansions = (Client.runtime_expansions

1776

1398

+ ("dbus_object_path", ))

1777

1399

1778

1400

_interface = "se.recompile.Mandos.Client"

1779

1401

1780

1402

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

1781

1782

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

1403

1404

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

1783

1405

self.bus = bus

1784

1406

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

1785

1407

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

1791

1413

"/clients/" + client_object_name)

1792

1414

DBusObjectWithProperties.__init__(self, self.bus,

1793

1415

self.dbus_object_path)

1794

1416

1795

1417

def notifychangeproperty(transform_func, dbus_name,

1796

1418

type_func=lambda x: x,

1797

1419

variant_level=1,

1799

1421

_interface=_interface):

1800

1422

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

1801

1423

its changes to DBus.

1802

1424

1803

1425

transform_fun: Function that takes a value and a variant_level

1804

1426

and transforms it to a D-Bus type.

1805

1427

dbus_name: D-Bus name of the variable

1808

1430

variant_level: D-Bus variant level. Default: 1

1809

1431

"""

1810

1432

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

1811

1433

1812

1434

def setter(self, value):

1813

1435

if hasattr(self, "dbus_object_path"):

1814

1436

if (not hasattr(self, attrname) or

1821

1443

else:

1822

1444

dbus_value = transform_func(

1823

1445

type_func(value),

1824

variant_level=variant_level)

1446

variant_level = variant_level)

1825

1447

self.PropertyChanged(dbus.String(dbus_name),

1826

1448

dbus_value)

1827

1449

self.PropertiesChanged(

1828

1450

_interface,

1829

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

1830

dbus_value}),

1451

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

1452

dbus_value }),

1831

1453

dbus.Array())

1832

1454

setattr(self, attrname, value)

1833

1455

1834

1456

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

1835

1457

1836

1458

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1837

1459

approvals_pending = notifychangeproperty(dbus.Boolean,

1838

1460

"ApprovalPending",

1839

type_func=bool)

1461

type_func = bool)

1840

1462

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

1841

1463

last_enabled = notifychangeproperty(datetime_to_dbus,

1842

1464

"LastEnabled")

1843

1465

checker = notifychangeproperty(

1844

1466

dbus.Boolean, "CheckerRunning",

1845

type_func=lambda checker: checker is not None)

1467

type_func = lambda checker: checker is not None)

1846

1468

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1847

1469

"LastCheckedOK")

1848

1470

last_checker_status = notifychangeproperty(dbus.Int16,

1853

1475

"ApprovedByDefault")

1854

1476

approval_delay = notifychangeproperty(

1855

1477

dbus.UInt64, "ApprovalDelay",

1856

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

1478

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

1857

1479

approval_duration = notifychangeproperty(

1858

1480

dbus.UInt64, "ApprovalDuration",

1859

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

1481

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

1860

1482

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

1861

1483

timeout = notifychangeproperty(

1862

1484

dbus.UInt64, "Timeout",

1863

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

1485

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

1864

1486

extended_timeout = notifychangeproperty(

1865

1487

dbus.UInt64, "ExtendedTimeout",

1866

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

1488

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

1867

1489

interval = notifychangeproperty(

1868

1490

dbus.UInt64, "Interval",

1869

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

1491

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

1870

1492

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

1871

1493

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

1872

1494

invalidate_only=True)

1873

1495

1874

1496

del notifychangeproperty

1875

1497

1876

1498

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

1877

1499

try:

1878

1500

self.remove_from_connection()

1881

1503

if hasattr(DBusObjectWithProperties, "__del__"):

1882

1504

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

1883

1505

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

1884

1506

1885

1507

def checker_callback(self, source, condition,

1886

1508

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

1887

1509

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

1903

1525

| self.last_checker_signal),

1904

1526

dbus.String(command))

1905

1527

return ret

1906

1528

1907

1529

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

1908

1530

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

1909

1531

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

1913

1535

# Emit D-Bus signal

1914

1536

self.CheckerStarted(self.current_checker_command)

1915

1537

return r

1916

1538

1917

1539

def _reset_approved(self):

1918

1540

self.approved = None

1919

1541

return False

1920

1542

1921

1543

def approve(self, value=True):

1922

1544

self.approved = value

1923

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

1924

* 1000), self._reset_approved)

1545

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

1546

* 1000), self._reset_approved)

1925

1547

self.send_changedstate()

1926

1927

# D-Bus methods, signals & properties

1928

1929

# Interfaces

1930

1931

# Signals

1932

1548

1549

## D-Bus methods, signals & properties

1550

1551

## Interfaces

1552

1553

## Signals

1554

1933

1555

# CheckerCompleted - signal

1934

1556

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

1935

1557

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

1936

1558

"D-Bus signal"

1937

1559

pass

1938

1560

1939

1561

# CheckerStarted - signal

1940

1562

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

1941

1563

def CheckerStarted(self, command):

1942

1564

"D-Bus signal"

1943

1565

pass

1944

1566

1945

1567

# PropertyChanged - signal

1946

1568

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

1947

1569

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

1948

1570

def PropertyChanged(self, property, value):

1949

1571

"D-Bus signal"

1950

1572

pass

1951

1573

1952

1574

# GotSecret - signal

1953

1575

@dbus.service.signal(_interface)

1954

1576

def GotSecret(self):

1957

1579

server to mandos-client

1958

1580

"""

1959

1581

pass

1960

1582

1961

1583

# Rejected - signal

1962

1584

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

1963

1585

def Rejected(self, reason):

1964

1586

"D-Bus signal"

1965

1587

pass

1966

1588

1967

1589

# NeedApproval - signal

1968

1590

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

1969

1591

def NeedApproval(self, timeout, default):

1970

1592

"D-Bus signal"

1971

1593

return self.need_approval()

1972

1973

# Methods

1974

1594

1595

## Methods

1596

1975

1597

# Approve - method

1976

1598

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

1977

1599

def Approve(self, value):

1978

1600

self.approve(value)

1979

1601

1980

1602

# CheckedOK - method

1981

1603

@dbus.service.method(_interface)

1982

1604

def CheckedOK(self):

1983

1605

self.checked_ok()

1984

1606

1985

1607

# Enable - method

1986

1608

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

1987

1609

@dbus.service.method(_interface)

1988

1610

def Enable(self):

1989

1611

"D-Bus method"

1990

1612

self.enable()

1991

1613

1992

1614

# StartChecker - method

1993

1615

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

1994

1616

@dbus.service.method(_interface)

1995

1617

def StartChecker(self):

1996

1618

"D-Bus method"

1997

1619

self.start_checker()

1998

1620

1999

1621

# Disable - method

2000

1622

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

2001

1623

@dbus.service.method(_interface)

2002

1624

def Disable(self):

2003

1625

"D-Bus method"

2004

1626

self.disable()

2005

1627

2006

1628

# StopChecker - method

2007

1629

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

2008

1630

@dbus.service.method(_interface)

2009

1631

def StopChecker(self):

2010

1632

self.stop_checker()

2011

2012

# Properties

2013

1633

1634

## Properties

1635

2014

1636

# ApprovalPending - property

2015

1637

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

2016

1638

def ApprovalPending_dbus_property(self):

2017

1639

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

2018

1640

2019

1641

# ApprovedByDefault - property

2020

1642

@dbus_service_property(_interface,

2021

1643

signature="b",

2024

1646

if value is None: # get

2025

1647

return dbus.Boolean(self.approved_by_default)

2026

1648

self.approved_by_default = bool(value)

2027

1649

2028

1650

# ApprovalDelay - property

2029

1651

@dbus_service_property(_interface,

2030

1652

signature="t",

2034

1656

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

2035

1657

* 1000)

2036

1658

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

2037

1659

2038

1660

# ApprovalDuration - property

2039

1661

@dbus_service_property(_interface,

2040

1662

signature="t",

2044

1666

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

2045

1667

* 1000)

2046

1668

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

2047

1669

2048

1670

# Name - property

2049

1671

@dbus_annotations(

2050

1672

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

2051

1673

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

2052

1674

def Name_dbus_property(self):

2053

1675

return dbus.String(self.name)

2054

2055

# KeyID - property

2056

@dbus_annotations(

2057

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

2058

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

2059

def KeyID_dbus_property(self):

2060

return dbus.String(self.key_id)

2061

1676

2062

1677

# Fingerprint - property

2063

1678

@dbus_annotations(

2064

1679

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

2065

1680

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

2066

1681

def Fingerprint_dbus_property(self):

2067

1682

return dbus.String(self.fingerprint)

2068

1683

2069

1684

# Host - property

2070

1685

@dbus_service_property(_interface,

2071

1686

signature="s",

2074

1689

if value is None: # get

2075

1690

return dbus.String(self.host)

2076

1691

self.host = str(value)

2077

1692

2078

1693

# Created - property

2079

1694

@dbus_annotations(

2080

1695

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

2081

1696

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

2082

1697

def Created_dbus_property(self):

2083

1698

return datetime_to_dbus(self.created)

2084

1699

2085

1700

# LastEnabled - property

2086

1701

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

2087

1702

def LastEnabled_dbus_property(self):

2088

1703

return datetime_to_dbus(self.last_enabled)

2089

1704

2090

1705

# Enabled - property

2091

1706

@dbus_service_property(_interface,

2092

1707

signature="b",

2098

1713

self.enable()

2099

1714

else:

2100

1715

self.disable()

2101

1716

2102

1717

# LastCheckedOK - property

2103

1718

@dbus_service_property(_interface,

2104

1719

signature="s",

2108

1723

self.checked_ok()

2109

1724

return

2110

1725

return datetime_to_dbus(self.last_checked_ok)

2111

1726

2112

1727

# LastCheckerStatus - property

2113

1728

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

2114

1729

def LastCheckerStatus_dbus_property(self):

2115

1730

return dbus.Int16(self.last_checker_status)

2116

1731

2117

1732

# Expires - property

2118

1733

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

2119

1734

def Expires_dbus_property(self):

2120

1735

return datetime_to_dbus(self.expires)

2121

1736

2122

1737

# LastApprovalRequest - property

2123

1738

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

2124

1739

def LastApprovalRequest_dbus_property(self):

2125

1740

return datetime_to_dbus(self.last_approval_request)

2126

1741

2127

1742

# Timeout - property

2128

1743

@dbus_service_property(_interface,

2129

1744

signature="t",

2144

1759

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

2145

1760

is None):

2146

1761

return

2147

GLib.source_remove(self.disable_initiator_tag)

2148

self.disable_initiator_tag = GLib.timeout_add(

1762

gobject.source_remove(self.disable_initiator_tag)

1763

self.disable_initiator_tag = gobject.timeout_add(

2149

1764

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

2150

1765

self.disable)

2151

1766

2152

1767

# ExtendedTimeout - property

2153

1768

@dbus_service_property(_interface,

2154

1769

signature="t",

2158

1773

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

2159

1774

* 1000)

2160

1775

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

2161

1776

2162

1777

# Interval - property

2163

1778

@dbus_service_property(_interface,

2164

1779

signature="t",

2171

1786

return

2172

1787

if self.enabled:

2173

1788

# Reschedule checker run

2174

GLib.source_remove(self.checker_initiator_tag)

2175

self.checker_initiator_tag = GLib.timeout_add(

1789

gobject.source_remove(self.checker_initiator_tag)

1790

self.checker_initiator_tag = gobject.timeout_add(

2176

1791

value, self.start_checker)

2177

self.start_checker() # Start one now, too

2178

1792

self.start_checker() # Start one now, too

1793

2179

1794

# Checker - property

2180

1795

@dbus_service_property(_interface,

2181

1796

signature="s",

2184

1799

if value is None: # get

2185

1800

return dbus.String(self.checker_command)

2186

1801

self.checker_command = str(value)

2187

1802

2188

1803

# CheckerRunning - property

2189

1804

@dbus_service_property(_interface,

2190

1805

signature="b",

2196

1811

self.start_checker()

2197

1812

else:

2198

1813

self.stop_checker()

2199

1814

2200

1815

# ObjectPath - property

2201

1816

@dbus_annotations(

2202

1817

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

2203

1818

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

2204

1819

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

2205

1820

def ObjectPath_dbus_property(self):

2206

return self.dbus_object_path # is already a dbus.ObjectPath

2207

1821

return self.dbus_object_path # is already a dbus.ObjectPath

1822

2208

1823

# Secret = property

2209

1824

@dbus_annotations(

2210

1825

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

2215

1830

byte_arrays=True)

2216

1831

def Secret_dbus_property(self, value):

2217

1832

self.secret = bytes(value)

2218

1833

2219

1834

del _interface

2220

1835

2221

1836

2222

1837

class ProxyClient(object):

2223

def __init__(self, child_pipe, key_id, fpr, address):

1838

def __init__(self, child_pipe, fpr, address):

2224

1839

self._pipe = child_pipe

2225

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

1840

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

2226

1841

if not self._pipe.recv():

2227

raise KeyError(key_id or fpr)

2228

1842

raise KeyError(fpr)

1843

2229

1844

def __getattribute__(self, name):

2230

1845

if name == '_pipe':

2231

1846

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

2234

1849

if data[0] == 'data':

2235

1850

return data[1]

2236

1851

if data[0] == 'function':

2237

1852

2238

1853

def func(*args, **kwargs):

2239

1854

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

2240

1855

return self._pipe.recv()[1]

2241

1856

2242

1857

return func

2243

1858

2244

1859

def __setattr__(self, name, value):

2245

1860

if name == '_pipe':

2246

1861

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

2249

1864

2250

1865

class ClientHandler(socketserver.BaseRequestHandler, object):

2251

1866

"""A class to handle client connections.

2252

1867

2253

1868

Instantiated once for each connection to handle it.

2254

1869

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

2255

1870

2256

1871

def handle(self):

2257

1872

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

2258

1873

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

2259

1874

str(self.client_address))

2260

1875

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

2261

1876

self.server.child_pipe.fileno())

2262

2263

session = gnutls.ClientSession(self.request)

2264

2265

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

2266

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

2267

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

2268

# "+DHE-DSS"))

1877

1878

session = gnutls.connection.ClientSession(

1879

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

1880

1881

# Note: gnutls.connection.X509Credentials is really a

1882

# generic GnuTLS certificate credentials object so long as

1883

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

1884

# here despite using OpenPGP certificates.

1885

1886

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

1887

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

1888

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

1889

# "+DHE-DSS"))

2269

1890

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

2270

1891

priority = self.server.gnutls_priority

2271

1892

if priority is None:

2272

1893

priority = "NORMAL"

2273

gnutls.priority_set_direct(session._c_object,

2274

priority.encode("utf-8"),

2275

None)

2276

1894

gnutls.library.functions.gnutls_priority_set_direct(

1895

session._c_object, priority, None)

1896

2277

1897

# Start communication using the Mandos protocol

2278

1898

# Get protocol number

2279

1899

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

2284

1904

except (ValueError, IndexError, RuntimeError) as error:

2285

1905

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

2286

1906

return

2287

1907

2288

1908

# Start GnuTLS connection

2289

1909

try:

2290

1910

session.handshake()

2291

except gnutls.Error as error:

1911

except gnutls.errors.GNUTLSError as error:

2292

1912

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

2293

1913

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

2294

1914

# established. Just abandon the request.

2295

1915

return

2296

1916

logger.debug("Handshake succeeded")

2297

1917

2298

1918

approval_required = False

2299

1919

try:

2300

if gnutls.has_rawpk:

2301

fpr = ""

2302

try:

2303

key_id = self.key_id(

2304

self.peer_certificate(session))

2305

except (TypeError, gnutls.Error) as error:

2306

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

2307

return

2308

logger.debug("Key ID: %s", key_id)

2309

2310

else:

2311

key_id = ""

2312

try:

2313

fpr = self.fingerprint(

2314

self.peer_certificate(session))

2315

except (TypeError, gnutls.Error) as error:

2316

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

2317

return

2318

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

2319

2320

try:

2321

client = ProxyClient(child_pipe, key_id, fpr,

1920

try:

1921

fpr = self.fingerprint(

1922

self.peer_certificate(session))

1923

except (TypeError,

1924

gnutls.errors.GNUTLSError) as error:

1925

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

1926

return

1927

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

1928

1929

try:

1930

client = ProxyClient(child_pipe, fpr,

2322

1931

self.client_address)

2323

1932

except KeyError:

2324

1933

return

2325

1934

2326

1935

if client.approval_delay:

2327

1936

delay = client.approval_delay

2328

1937

client.approvals_pending += 1

2329

1938

approval_required = True

2330

1939

2331

1940

while True:

2332

1941

if not client.enabled:

2333

1942

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

2336

1945

# Emit D-Bus signal

2337

1946

client.Rejected("Disabled")

2338

1947

return

2339

1948

2340

1949

if client.approved or not client.approval_delay:

2341

# We are approved or approval is disabled

1950

#We are approved or approval is disabled

2342

1951

break

2343

1952

elif client.approved is None:

2344

1953

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

2355

1964

# Emit D-Bus signal

2356

1965

client.Rejected("Denied")

2357

1966

return

2358

2359

# wait until timeout or approved

1967

1968

#wait until timeout or approved

2360

1969

time = datetime.datetime.now()

2361

1970

client.changedstate.acquire()

2362

1971

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

2375

1984

break

2376

1985

else:

2377

1986

delay -= time2 - time

2378

2379

try:

2380

session.send(client.secret)

2381

except gnutls.Error as error:

2382

logger.warning("gnutls send failed",

2383

exc_info=error)

2384

return

2385

1987

1988

sent_size = 0

1989

while sent_size < len(client.secret):

1990

try:

1991

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

1992

except gnutls.errors.GNUTLSError as error:

1993

logger.warning("gnutls send failed",

1994

exc_info=error)

1995

return

1996

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

1997

len(client.secret) - (sent_size

1998

+ sent))

1999

sent_size += sent

2000

2386

2001

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

2387

2002

# bump the timeout using extended_timeout

2388

2003

client.bump_timeout(client.extended_timeout)

2389

2004

if self.server.use_dbus:

2390

2005

# Emit D-Bus signal

2391

2006

client.GotSecret()

2392

2007

2393

2008

finally:

2394

2009

if approval_required:

2395

2010

client.approvals_pending -= 1

2396

2011

try:

2397

2012

session.bye()

2398

except gnutls.Error as error:

2013

except gnutls.errors.GNUTLSError as error:

2399

2014

logger.warning("GnuTLS bye failed",

2400

2015

exc_info=error)

2401

2016

2402

2017

@staticmethod

2403

2018

def peer_certificate(session):

2404

"Return the peer's certificate as a bytestring"

2405

try:

2406

cert_type = gnutls.certificate_type_get2(session._c_object,

2407

gnutls.CTYPE_PEERS)

2408

except AttributeError:

2409

cert_type = gnutls.certificate_type_get(session._c_object)

2410

if gnutls.has_rawpk:

2411

valid_cert_types = frozenset((gnutls.CRT_RAWPK,))

2412

else:

2413

valid_cert_types = frozenset((gnutls.CRT_OPENPGP,))

2414

# If not a valid certificate type...

2415

if cert_type not in valid_cert_types:

2416

logger.info("Cert type %r not in %r", cert_type,

2417

valid_cert_types)

2418

# ...return invalid data

2419

return b""

2019

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

2020

# If not an OpenPGP certificate...

2021

if (gnutls.library.functions.gnutls_certificate_type_get(

2022

session._c_object)

2023

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

2024

# ...do the normal thing

2025

return session.peer_certificate

2420

2026

list_size = ctypes.c_uint(1)

2421

cert_list = (gnutls.certificate_get_peers

2027

cert_list = (gnutls.library.functions

2028

.gnutls_certificate_get_peers

2422

2029

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

2423

2030

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

2424

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

2031

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

2032

" certificate")

2425

2033

if list_size.value == 0:

2426

2034

return None

2427

2035

cert = cert_list[0]

2428

2036

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

2429

2430

@staticmethod

2431

def key_id(certificate):

2432

"Convert a certificate bytestring to a hexdigit key ID"

2433

# New GnuTLS "datum" with the public key

2434

datum = gnutls.datum_t(

2435

ctypes.cast(ctypes.c_char_p(certificate),

2436

ctypes.POINTER(ctypes.c_ubyte)),

2437

ctypes.c_uint(len(certificate)))

2438

# XXX all these need to be created in the gnutls "module"

2439

# New empty GnuTLS certificate

2440

pubkey = gnutls.pubkey_t()

2441

gnutls.pubkey_init(ctypes.byref(pubkey))

2442

# Import the raw public key into the certificate

2443

gnutls.pubkey_import(pubkey,

2444

ctypes.byref(datum),

2445

gnutls.X509_FMT_DER)

2446

# New buffer for the key ID

2447

buf = ctypes.create_string_buffer(32)

2448

buf_len = ctypes.c_size_t(len(buf))

2449

# Get the key ID from the raw public key into the buffer

2450

gnutls.pubkey_get_key_id(pubkey,

2451

gnutls.KEYID_USE_SHA256,

2452

ctypes.cast(ctypes.byref(buf),

2453

ctypes.POINTER(ctypes.c_ubyte)),

2454

ctypes.byref(buf_len))

2455

# Deinit the certificate

2456

gnutls.pubkey_deinit(pubkey)

2457

2458

# Convert the buffer to a Python bytestring

2459

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

2460

# Convert the bytestring to hexadecimal notation

2461

hex_key_id = binascii.hexlify(key_id).upper()

2462

return hex_key_id

2463

2037

2464

2038

@staticmethod

2465

2039

def fingerprint(openpgp):

2466

2040

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

2467

2041

# New GnuTLS "datum" with the OpenPGP public key

2468

datum = gnutls.datum_t(

2042

datum = gnutls.library.types.gnutls_datum_t(

2469

2043

ctypes.cast(ctypes.c_char_p(openpgp),

2470

2044

ctypes.POINTER(ctypes.c_ubyte)),

2471

2045

ctypes.c_uint(len(openpgp)))

2472

2046

# New empty GnuTLS certificate

2473

crt = gnutls.openpgp_crt_t()

2474

gnutls.openpgp_crt_init(ctypes.byref(crt))

2047

crt = gnutls.library.types.gnutls_openpgp_crt_t()

2048

gnutls.library.functions.gnutls_openpgp_crt_init(

2049

ctypes.byref(crt))

2475

2050

# Import the OpenPGP public key into the certificate

2476

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

2477

gnutls.OPENPGP_FMT_RAW)

2051

gnutls.library.functions.gnutls_openpgp_crt_import(

2052

crt, ctypes.byref(datum),

2053

gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)

2478

2054

# Verify the self signature in the key

2479

2055

crtverify = ctypes.c_uint()

2480

gnutls.openpgp_crt_verify_self(crt, 0,

2481

ctypes.byref(crtverify))

2056

gnutls.library.functions.gnutls_openpgp_crt_verify_self(

2057

crt, 0, ctypes.byref(crtverify))

2482

2058

if crtverify.value != 0:

2483

gnutls.openpgp_crt_deinit(crt)

2484

raise gnutls.CertificateSecurityError(code

2485

=crtverify.value)

2059

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2060

raise gnutls.errors.CertificateSecurityError(

2061

"Verify failed")

2486

2062

# New buffer for the fingerprint

2487

2063

buf = ctypes.create_string_buffer(20)

2488

2064

buf_len = ctypes.c_size_t()

2489

2065

# Get the fingerprint from the certificate into the buffer

2490

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

2491

ctypes.byref(buf_len))

2066

gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint(

2067

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

2492

2068

# Deinit the certificate

2493

gnutls.openpgp_crt_deinit(crt)

2069

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2494

2070

# Convert the buffer to a Python bytestring

2495

2071

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

2496

2072

# Convert the bytestring to hexadecimal notation

2500

2076

2501

2077

class MultiprocessingMixIn(object):

2502

2078

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

2503

2079

2504

2080

def sub_process_main(self, request, address):

2505

2081

try:

2506

2082

self.finish_request(request, address)

2507

2083

except Exception:

2508

2084

self.handle_error(request, address)

2509

2085

self.close_request(request)

2510

2086

2511

2087

def process_request(self, request, address):

2512

2088

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

2513

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

2514

args=(request, address))

2089

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

2090

args = (request, address))

2515

2091

proc.start()

2516

2092

return proc

2517

2093

2518

2094

2519

2095

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

2520

2096

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

2521

2097

2522

2098

def process_request(self, request, client_address):

2523

2099

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

2524

2100

2525

2101

This function creates a new pipe in self.pipe

2526

2102

"""

2527

2103

parent_pipe, self.child_pipe = multiprocessing.Pipe()

2528

2104

2529

2105

proc = MultiprocessingMixIn.process_request(self, request,

2530

2106

client_address)

2531

2107

self.child_pipe.close()

2532

2108

self.add_pipe(parent_pipe, proc)

2533

2109

2534

2110

def add_pipe(self, parent_pipe, proc):

2535

2111

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

2536

2112

raise NotImplementedError()

2539

2115

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

2540

2116

socketserver.TCPServer, object):

2541

2117

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

2542

2118

2543

2119

Attributes:

2544

2120

enabled: Boolean; whether this server is activated yet

2545

2121

interface: None or a network interface name (string)

2546

2122

use_ipv6: Boolean; to use IPv6 or not

2547

2123

"""

2548

2124

2549

2125

def __init__(self, server_address, RequestHandlerClass,

2550

2126

interface=None,

2551

2127

use_ipv6=True,

2561

2137

self.socketfd = socketfd

2562

2138

# Save the original socket.socket() function

2563

2139

self.socket_socket = socket.socket

2564

2565

2140

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

2566

#

2141

#

2567

2142

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

2568

2143

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

2569

2144

# patching socket.socket.)

2570

#

2145

#

2571

2146

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

2572

2147

@functools.wraps(socket.socket)

2573

2148

def socket_wrapper(*args, **kwargs):

2585

2160

# socket_wrapper(), if socketfd was set.

2586

2161

socketserver.TCPServer.__init__(self, server_address,

2587

2162

RequestHandlerClass)

2588

2163

2589

2164

def server_bind(self):

2590

2165

"""This overrides the normal server_bind() function

2591

2166

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

2592

2167

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

2593

global SO_BINDTODEVICE

2594

2168

if self.interface is not None:

2595

2169

if SO_BINDTODEVICE is None:

2596

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

2597

# common enough.

2598

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

2599

SO_BINDTODEVICE = 25

2600

try:

2601

self.socket.setsockopt(

2602

socket.SOL_SOCKET, SO_BINDTODEVICE,

2603

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

2604

except socket.error as error:

2605

if error.errno == errno.EPERM:

2606

logger.error("No permission to bind to"

2607

" interface %s", self.interface)

2608

elif error.errno == errno.ENOPROTOOPT:

2609

logger.error("SO_BINDTODEVICE not available;"

2610

" cannot bind to interface %s",

2611

self.interface)

2612

elif error.errno == errno.ENODEV:

2613

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

2614

" cannot bind", self.interface)

2615

else:

2616

raise

2170

logger.error("SO_BINDTODEVICE does not exist;"

2171

" cannot bind to interface %s",

2172

self.interface)

2173

else:

2174

try:

2175

self.socket.setsockopt(

2176

socket.SOL_SOCKET, SO_BINDTODEVICE,

2177

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

2178

except socket.error as error:

2179

if error.errno == errno.EPERM:

2180

logger.error("No permission to bind to"

2181

" interface %s", self.interface)

2182

elif error.errno == errno.ENOPROTOOPT:

2183

logger.error("SO_BINDTODEVICE not available;"

2184

" cannot bind to interface %s",

2185

self.interface)

2186

elif error.errno == errno.ENODEV:

2187

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

2188

" cannot bind", self.interface)

2189

else:

2190

raise

2617

2191

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

2618

2192

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

2619

2193

if not self.server_address[0]:

2620

2194

if self.address_family == socket.AF_INET6:

2621

any_address = "::" # in6addr_any

2195

any_address = "::" # in6addr_any

2622

2196

else:

2623

any_address = "0.0.0.0" # INADDR_ANY

2197

any_address = "0.0.0.0" # INADDR_ANY

2624

2198

self.server_address = (any_address,

2625

2199

self.server_address[1])

2626

2200

elif not self.server_address[1]:

2636

2210

2637

2211

class MandosServer(IPv6_TCPServer):

2638

2212

"""Mandos server.

2639

2213

2640

2214

Attributes:

2641

2215

clients: set of Client objects

2642

2216

gnutls_priority GnuTLS priority string

2643

2217

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

2644

2645

Assumes a GLib.MainLoop event loop.

2218

2219

Assumes a gobject.MainLoop event loop.

2646

2220

"""

2647

2221

2648

2222

def __init__(self, server_address, RequestHandlerClass,

2649

2223

interface=None,

2650

2224

use_ipv6=True,

2660

2234

self.gnutls_priority = gnutls_priority

2661

2235

IPv6_TCPServer.__init__(self, server_address,

2662

2236

RequestHandlerClass,

2663

interface=interface,

2664

use_ipv6=use_ipv6,

2665

socketfd=socketfd)

2666

2237

interface = interface,

2238

use_ipv6 = use_ipv6,

2239

socketfd = socketfd)

2240

2667

2241

def server_activate(self):

2668

2242

if self.enabled:

2669

2243

return socketserver.TCPServer.server_activate(self)

2670

2244

2671

2245

def enable(self):

2672

2246

self.enabled = True

2673

2247

2674

2248

def add_pipe(self, parent_pipe, proc):

2675

2249

# Call "handle_ipc" for both data and EOF events

2676

GLib.io_add_watch(

2250

gobject.io_add_watch(

2677

2251

parent_pipe.fileno(),

2678

GLib.IO_IN | GLib.IO_HUP,

2252

gobject.IO_IN | gobject.IO_HUP,

2679

2253

functools.partial(self.handle_ipc,

2680

parent_pipe=parent_pipe,

2681

proc=proc))

2682

2254

parent_pipe = parent_pipe,

2255

proc = proc))

2256

2683

2257

def handle_ipc(self, source, condition,

2684

2258

parent_pipe=None,

2685

proc=None,

2259

proc = None,

2686

2260

client_object=None):

2687

2261

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

2688

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

2262

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

2689

2263

# Wait for other process to exit

2690

2264

proc.join()

2691

2265

return False

2692

2266

2693

2267

# Read a request from the child

2694

2268

request = parent_pipe.recv()

2695

2269

command = request[0]

2696

2270

2697

2271

if command == 'init':

2698

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

2699

fpr = request[2].decode("ascii")

2700

address = request[3]

2701

2702

for c in self.clients.values():

2703

if key_id and c.key_id == key_id:

2704

client = c

2705

break

2706

if fpr and c.fingerprint == fpr:

2272

fpr = request[1]

2273

address = request[2]

2274

2275

for c in self.clients.itervalues():

2276

if c.fingerprint == fpr:

2707

2277

client = c

2708

2278

break

2709

2279

else:

2710

logger.info("Client not found for key ID: %s, address"

2711

": %s", key_id or fpr, address)

2280

logger.info("Client not found for fingerprint: %s, ad"

2281

"dress: %s", fpr, address)

2712

2282

if self.use_dbus:

2713

2283

# Emit D-Bus signal

2714

mandos_dbus_service.ClientNotFound(key_id or fpr,

2284

mandos_dbus_service.ClientNotFound(fpr,

2715

2285

address[0])

2716

2286

parent_pipe.send(False)

2717

2287

return False

2718

2719

GLib.io_add_watch(

2288

2289

gobject.io_add_watch(

2720

2290

parent_pipe.fileno(),

2721

GLib.IO_IN | GLib.IO_HUP,

2291

gobject.IO_IN | gobject.IO_HUP,

2722

2292

functools.partial(self.handle_ipc,

2723

parent_pipe=parent_pipe,

2724

proc=proc,

2725

client_object=client))

2293

parent_pipe = parent_pipe,

2294

proc = proc,

2295

client_object = client))

2726

2296

parent_pipe.send(True)

2727

2297

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

2728

2298

# same fileno

2731

2301

funcname = request[1]

2732

2302

args = request[2]

2733

2303

kwargs = request[3]

2734

2304

2735

2305

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

2736

2306

funcname)(*args,

2737

2307

**kwargs)))

2738

2308

2739

2309

if command == 'getattr':

2740

2310

attrname = request[1]

2741

2311

if isinstance(client_object.__getattribute__(attrname),

2744

2314

else:

2745

2315

parent_pipe.send((

2746

2316

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

2747

2317

2748

2318

if command == 'setattr':

2749

2319

attrname = request[1]

2750

2320

value = request[2]

2751

2321

setattr(client_object, attrname, value)

2752

2322

2753

2323

return True

2754

2324

2755

2325

2756

2326

def rfc3339_duration_to_delta(duration):

2757

2327

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

2758

2328

2759

2329

>>> rfc3339_duration_to_delta("P7D")

2760

2330

datetime.timedelta(7)

2761

2331

>>> rfc3339_duration_to_delta("PT60S")

2771

2341

>>> rfc3339_duration_to_delta("P1DT3M20S")

2772

2342

datetime.timedelta(1, 200)

2773

2343

"""

2774

2344

2775

2345

# Parsing an RFC 3339 duration with regular expressions is not

2776

2346

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

2777

2347

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

2778

2348

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

2779

2349

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

2780

2350

# avoid excessive use of external libraries.

2781

2351

2782

2352

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

2783

2353

Token = collections.namedtuple("Token", (

2784

2354

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

2817

2387

frozenset((token_year, token_month,

2818

2388

token_day, token_time,

2819

2389

token_week)))

2820

# Define starting values:

2821

# Value so far

2822

value = datetime.timedelta()

2390

# Define starting values

2391

value = datetime.timedelta() # Value so far

2823

2392

found_token = None

2824

# Following valid tokens

2825

followers = frozenset((token_duration, ))

2826

# String left to parse

2827

s = duration

2393

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

2394

s = duration # String left to parse

2828

2395

# Loop until end token is found

2829

2396

while found_token is not token_end:

2830

2397

# Search for any currently valid tokens

2854

2421

2855

2422

def string_to_delta(interval):

2856

2423

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

2857

2424

2858

2425

>>> string_to_delta('7d')

2859

2426

datetime.timedelta(7)

2860

2427

>>> string_to_delta('60s')

2868

2435

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

2869

2436

datetime.timedelta(0, 330)

2870

2437

"""

2871

2438

2872

2439

try:

2873

2440

return rfc3339_duration_to_delta(interval)

2874

2441

except ValueError:

2875

2442

pass

2876

2443

2877

2444

timevalue = datetime.timedelta(0)

2878

2445

for s in interval.split():

2879

2446

try:

2897

2464

return timevalue

2898

2465

2899

2466

2900

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

2467

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

2901

2468

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

2902

2469

2903

2470

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

2904

2471

if os.fork():

2905

2472

sys.exit()

2923

2490

2924

2491

2925

2492

def main():

2926

2493

2927

2494

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

2928

2495

# Parsing of options, both command line and config file

2929

2496

2930

2497

parser = argparse.ArgumentParser()

2931

2498

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

2932

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

2499

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

2933

2500

help="show version number and exit")

2934

2501

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

2935

2502

help="Bind to interface IF")

2971

2538

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

2972

2539

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

2973

2540

default=None)

2974

2541

2975

2542

options = parser.parse_args()

2976

2543

2977

2544

if options.check:

2978

2545

import doctest

2979

2546

fail_count, test_count = doctest.testmod()

2980

2547

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

2981

2548

2982

2549

# Default values for config file for server-global settings

2983

if gnutls.has_rawpk:

2984

priority = ("SECURE128:!CTYPE-X.509:+CTYPE-RAWPK:!RSA"

2985

":!VERS-ALL:+VERS-TLS1.3:%PROFILE_ULTRA")

2986

else:

2987

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

2988

":+SIGN-DSA-SHA256")

2989

server_defaults = {"interface": "",

2990

"address": "",

2991

"port": "",

2992

"debug": "False",

2993

"priority": priority,

2994

"servicename": "Mandos",

2995

"use_dbus": "True",

2996

"use_ipv6": "True",

2997

"debuglevel": "",

2998

"restore": "True",

2999

"socket": "",

3000

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

3001

"foreground": "False",

3002

"zeroconf": "True",

3003

}

3004

del priority

3005

2550

server_defaults = { "interface": "",

2551

"address": "",

2552

"port": "",

2553

"debug": "False",

2554

"priority":

2555

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

2556

":+SIGN-DSA-SHA256",

2557

"servicename": "Mandos",

2558

"use_dbus": "True",

2559

"use_ipv6": "True",

2560

"debuglevel": "",

2561

"restore": "True",

2562

"socket": "",

2563

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

2564

"foreground": "False",

2565

"zeroconf": "True",

2566

}

2567

3006

2568

# Parse config file for server-global settings

3007

2569

server_config = configparser.SafeConfigParser(server_defaults)

3008

2570

del server_defaults

3010

2572

# Convert the SafeConfigParser object to a dict

3011

2573

server_settings = server_config.defaults()

3012

2574

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

3013

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

3014

"foreground", "zeroconf"):

2575

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

3015

2576

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

3016

2577

option)

3017

2578

if server_settings["port"]:

3027

2588

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

3028

2589

["socket"])

3029

2590

del server_config

3030

2591

3031

2592

# Override the settings from the config file with command line

3032

2593

# options, if set.

3033

2594

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

3051

2612

if server_settings["debug"]:

3052

2613

server_settings["foreground"] = True

3053

2614

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

3054

2615

3055

2616

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

3056

2617

3057

2618

if (not server_settings["zeroconf"]

3058

2619

and not (server_settings["port"]

3059

2620

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

3060

2621

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

3061

2622

3062

2623

# For convenience

3063

2624

debug = server_settings["debug"]

3064

2625

debuglevel = server_settings["debuglevel"]

3068

2629

stored_state_file)

3069

2630

foreground = server_settings["foreground"]

3070

2631

zeroconf = server_settings["zeroconf"]

3071

2632

3072

2633

if debug:

3073

2634

initlogger(debug, logging.DEBUG)

3074

2635

else:

3077

2638

else:

3078

2639

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

3079

2640

initlogger(debug, level)

3080

2641

3081

2642

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

3082

2643

syslogger.setFormatter(

3083

2644

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

3084

2645

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

3085

2646

server_settings["servicename"])))

3086

2647

3087

2648

# Parse config file with clients

3088

2649

client_config = configparser.SafeConfigParser(Client

3089

2650

.client_defaults)

3090

2651

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

3091

2652

"clients.conf"))

3092

2653

3093

2654

global mandos_dbus_service

3094

2655

mandos_dbus_service = None

3095

2656

3096

2657

socketfd = None

3097

2658

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

3098

2659

socketfd = server_settings["socket"]

3114

2675

except IOError as e:

3115

2676

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

3116

2677

exc_info=e)

3117

3118

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

3119

("mandos", "mandos"),

3120

("nobody", "nogroup")):

2678

2679

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

3121

2680

try:

3122

2681

uid = pwd.getpwnam(name).pw_uid

3123

gid = pwd.getpwnam(group).pw_gid

2682

gid = pwd.getpwnam(name).pw_gid

3124

2683

break

3125

2684

except KeyError:

3126

2685

continue

3130

2689

try:

3131

2690

os.setgid(gid)

3132

2691

os.setuid(uid)

3133

if debug:

3134

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

3135

gid))

3136

2692

except OSError as error:

3137

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

3138

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

3139

2693

if error.errno != errno.EPERM:

3140

2694

raise

3141

2695

3142

2696

if debug:

3143

2697

# Enable all possible GnuTLS debugging

3144

2698

3145

2699

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

3146

2700

# - GnuTLS manual

3147

gnutls.global_set_log_level(11)

3148

3149

@gnutls.log_func

2701

gnutls.library.functions.gnutls_global_set_log_level(11)

2702

2703

@gnutls.library.types.gnutls_log_func

3150

2704

def debug_gnutls(level, string):

3151

2705

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

3152

3153

gnutls.global_set_log_function(debug_gnutls)

3154

2706

2707

gnutls.library.functions.gnutls_global_set_log_function(

2708

debug_gnutls)

2709

3155

2710

# Redirect stdin so all checkers get /dev/null

3156

2711

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

3157

2712

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

3158

2713

if null > 2:

3159

2714

os.close(null)

3160

2715

3161

2716

# Need to fork before connecting to D-Bus

3162

2717

if not foreground:

3163

2718

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

3164

2719

daemon()

3165

3166

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

3167

# to inform GLib that threads will be used.

3168

GLib.threads_init()

3169

2720

2721

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

2722

# need to inform gobject that threads will be used.

2723

gobject.threads_init()

2724

3170

2725

global main_loop

3171

2726

# From the Avahi example code

3172

2727

DBusGMainLoop(set_as_default=True)

3173

main_loop = GLib.MainLoop()

2728

main_loop = gobject.MainLoop()

3174

2729

bus = dbus.SystemBus()

3175

2730

# End of Avahi example code

3176

2731

if use_dbus:

3189

2744

if zeroconf:

3190

2745

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

3191

2746

service = AvahiServiceToSyslog(

3192

name=server_settings["servicename"],

3193

servicetype="_mandos._tcp",

3194

protocol=protocol,

3195

bus=bus)

2747

name = server_settings["servicename"],

2748

servicetype = "_mandos._tcp",

2749

protocol = protocol,

2750

bus = bus)

3196

2751

if server_settings["interface"]:

3197

2752

service.interface = if_nametoindex(

3198

2753

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

3199

2754

3200

2755

global multiprocessing_manager

3201

2756

multiprocessing_manager = multiprocessing.Manager()

3202

2757

3203

2758

client_class = Client

3204

2759

if use_dbus:

3205

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

3206

2760

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

2761

3207

2762

client_settings = Client.config_parser(client_config)

3208

2763

old_client_settings = {}

3209

2764

clients_data = {}

3210

2765

3211

2766

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

3212

2767

global wnull

3213

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

2768

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

3214

2769

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

3215

2770

# mode

3216

2771

if debug or not foreground:

3217

2772

wnull.close()

3218

2773

3219

2774

# Get client data and settings from last running state.

3220

2775

if server_settings["restore"]:

3221

2776

try:

3222

2777

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

3223

if sys.version_info.major == 2:

3224

clients_data, old_client_settings = pickle.load(

3225

stored_state)

3226

else:

3227

bytes_clients_data, bytes_old_client_settings = (

3228

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

3229

# Fix bytes to strings

3230

# clients_data

3231

# .keys()

3232

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

3233

if isinstance(key, bytes)

3234

else key): value

3235

for key, value in

3236

bytes_clients_data.items()}

3237

del bytes_clients_data

3238

for key in clients_data:

3239

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

3240

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

3241

for k, v in

3242

clients_data[key].items()}

3243

clients_data[key] = value

3244

# .client_structure

3245

value["client_structure"] = [

3246

(s.decode("utf-8")

3247

if isinstance(s, bytes)

3248

else s) for s in

3249

value["client_structure"]]

3250

# .name & .host

3251

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

3252

if isinstance(value[k], bytes):

3253

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

3254

if not value.has_key("key_id"):

3255

value["key_id"] = ""

3256

elif not value.has_key("fingerprint"):

3257

value["fingerprint"] = ""

3258

# old_client_settings

3259

# .keys()

3260

old_client_settings = {

3261

(key.decode("utf-8")

3262

if isinstance(key, bytes)

3263

else key): value

3264

for key, value in

3265

bytes_old_client_settings.items()}

3266

del bytes_old_client_settings

3267

# .host

3268

for value in old_client_settings.values():

3269

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

3270

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

3271

.decode("utf-8"))

2778

clients_data, old_client_settings = pickle.load(

2779

stored_state)

3272

2780

os.remove(stored_state_path)

3273

2781

except IOError as e:

3274

2782

if e.errno == errno.ENOENT:

3282

2790

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

3283

2791

"EOFError:",

3284

2792

exc_info=e)

3285

2793

3286

2794

with PGPEngine() as pgp:

3287

2795

for client_name, client in clients_data.items():

3288

2796

# Skip removed clients

3289

2797

if client_name not in client_settings:

3290

2798

continue

3291

2799

3292

2800

# Decide which value to use after restoring saved state.

3293

2801

# We have three different values: Old config file,

3294

2802

# new config file, and saved state.

3305

2813

client[name] = value

3306

2814

except KeyError:

3307

2815

pass

3308

2816

3309

2817

# Clients who has passed its expire date can still be

3310

2818

# enabled if its last checker was successful. A Client

3311

2819

# whose checker succeeded before we stored its state is

3344

2852

client_name))

3345

2853

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

3346

2854

["secret"])

3347

2855

3348

2856

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

3349

2857

for client_name in (set(old_client_settings)

3350

2858

- set(client_settings)):

3352

2860

for client_name in (set(client_settings)

3353

2861

- set(old_client_settings)):

3354

2862

clients_data[client_name] = client_settings[client_name]

3355

2863

3356

2864

# Create all client objects

3357

2865

for client_name, client in clients_data.items():

3358

2866

tcp_server.clients[client_name] = client_class(

3359

name=client_name,

3360

settings=client,

3361

server_settings=server_settings)

3362

2867

name = client_name,

2868

settings = client,

2869

server_settings = server_settings)

2870

3363

2871

if not tcp_server.clients:

3364

2872

logger.warning("No clients defined")

3365

2873

3366

2874

if not foreground:

3367

2875

if pidfile is not None:

3368

2876

pid = os.getpid()

3374

2882

pidfilename, pid)

3375

2883

del pidfile

3376

2884

del pidfilename

3377

3378

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

3379

GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,

3380

lambda: main_loop.quit() and False)

3381

2885

2886

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

2887

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

2888

3382

2889

if use_dbus:

3383

2890

3384

2891

@alternate_dbus_interfaces(

3385

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

2892

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

3386

2893

class MandosDBusService(DBusObjectWithObjectManager):

3387

2894

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

3388

2895

3389

2896

def __init__(self):

3390

2897

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

3391

2898

3392

2899

_interface = "se.recompile.Mandos"

3393

2900

3394

2901

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

3395

2902

def ClientAdded(self, objpath):

3396

2903

"D-Bus signal"

3397

2904

pass

3398

2905

3399

2906

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

3400

def ClientNotFound(self, key_id, address):

2907

def ClientNotFound(self, fingerprint, address):

3401

2908

"D-Bus signal"

3402

2909

pass

3403

2910

3404

2911

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

3405

2912

"true"})

3406

2913

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

3407

2914

def ClientRemoved(self, objpath, name):

3408

2915

"D-Bus signal"

3409

2916

pass

3410

2917

3411

2918

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

3412

2919

"true"})

3413

2920

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

3414

2921

def GetAllClients(self):

3415

2922

"D-Bus method"

3416

2923

return dbus.Array(c.dbus_object_path for c in

3417

tcp_server.clients.values())

3418

2924

tcp_server.clients.itervalues())

2925

3419

2926

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

3420

2927

"true"})

3421

2928

@dbus.service.method(_interface,

3423

2930

def GetAllClientsWithProperties(self):

3424

2931

"D-Bus method"

3425

2932

return dbus.Dictionary(

3426

{c.dbus_object_path: c.GetAll(

2933

{ c.dbus_object_path: c.GetAll(

3427

2934

"se.recompile.Mandos.Client")

3428

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

2935

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

3429

2936

signature="oa{sv}")

3430

2937

3431

2938

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

3432

2939

def RemoveClient(self, object_path):

3433

2940

"D-Bus method"

3434

for c in tcp_server.clients.values():

2941

for c in tcp_server.clients.itervalues():

3435

2942

if c.dbus_object_path == object_path:

3436

2943

del tcp_server.clients[c.name]

3437

2944

c.remove_from_connection()

3441

2948

self.client_removed_signal(c)

3442

2949

return

3443

2950

raise KeyError(object_path)

3444

2951

3445

2952

del _interface

3446

2953

3447

2954

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

3448

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

2955

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

3449

2956

def GetManagedObjects(self):

3450

2957

"""D-Bus method"""

3451

2958

return dbus.Dictionary(

3452

{client.dbus_object_path:

3453

dbus.Dictionary(

3454

{interface: client.GetAll(interface)

3455

for interface in

3456

client._get_all_interface_names()})

3457

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

3458

2959

{ client.dbus_object_path:

2960

dbus.Dictionary(

2961

{ interface: client.GetAll(interface)

2962

for interface in

2963

client._get_all_interface_names()})

2964

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

2965

3459

2966

def client_added_signal(self, client):

3460

2967

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

3461

2968

if use_dbus:

3463

2970

self.InterfacesAdded(

3464

2971

client.dbus_object_path,

3465

2972

dbus.Dictionary(

3466

{interface: client.GetAll(interface)

3467

for interface in

3468

client._get_all_interface_names()}))

2973

{ interface: client.GetAll(interface)

2974

for interface in

2975

client._get_all_interface_names()}))

3469

2976

# Old signal

3470

2977

self.ClientAdded(client.dbus_object_path)

3471

2978

3472

2979

def client_removed_signal(self, client):

3473

2980

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

3474

2981

if use_dbus:

3479

2986

# Old signal

3480

2987

self.ClientRemoved(client.dbus_object_path,

3481

2988

client.name)

3482

2989

3483

2990

mandos_dbus_service = MandosDBusService()

3484

3485

# Save modules to variables to exempt the modules from being

3486

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

3487

mp = multiprocessing

3488

wn = wnull

3489

2991

3490

2992

def cleanup():

3491

2993

"Cleanup function; run on exit"

3492

2994

if zeroconf:

3493

2995

service.cleanup()

3494

3495

mp.active_children()

3496

wn.close()

2996

2997

multiprocessing.active_children()

2998

wnull.close()

3497

2999

if not (tcp_server.clients or client_settings):

3498

3000

return

3499

3001

3500

3002

# Store client before exiting. Secrets are encrypted with key

3501

3003

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

3502

3004

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

3503

3005

clients = {}

3504

3006

with PGPEngine() as pgp:

3505

for client in tcp_server.clients.values():

3007

for client in tcp_server.clients.itervalues():

3506

3008

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

3507

3009

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

3508

3010

key)

3509

3011

client_dict = {}

3510

3012

3511

3013

# A list of attributes that can not be pickled

3512

3014

# + secret.

3513

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

3514

"checker", "server_settings"}

3015

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

3016

"checker", "server_settings" }

3515

3017

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

3516

3018

.Object):

3517

3019

exclude.add(name)

3518

3020

3519

3021

client_dict["encrypted_secret"] = (client

3520

3022

.encrypted_secret)

3521

3023

for attr in client.client_structure:

3522

3024

if attr not in exclude:

3523

3025

client_dict[attr] = getattr(client, attr)

3524

3026

3525

3027

clients[client.name] = client_dict

3526

3028

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

3527

3029

3528

3030

try:

3529

3031

with tempfile.NamedTemporaryFile(

3530

3032

mode='wb',

3532

3034

prefix='clients-',

3533

3035

dir=os.path.dirname(stored_state_path),

3534

3036

delete=False) as stored_state:

3535

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

3536

protocol=2)

3037

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

3537

3038

tempname = stored_state.name

3538

3039

os.rename(tempname, stored_state_path)

3539

3040

except (IOError, OSError) as e:

3549

3050

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

3550

3051

exc_info=e)

3551

3052

raise

3552

3053

3553

3054

# Delete all clients, and settings from config

3554

3055

while tcp_server.clients:

3555

3056

name, client = tcp_server.clients.popitem()

3558

3059

# Don't signal the disabling

3559

3060

client.disable(quiet=True)

3560

3061

# Emit D-Bus signal for removal

3561

if use_dbus:

3562

mandos_dbus_service.client_removed_signal(client)

3062

mandos_dbus_service.client_removed_signal(client)

3563

3063

client_settings.clear()

3564

3064

3565

3065

atexit.register(cleanup)

3566

3567

for client in tcp_server.clients.values():

3066

3067

for client in tcp_server.clients.itervalues():

3568

3068

if use_dbus:

3569

3069

# Emit D-Bus signal for adding

3570

3070

mandos_dbus_service.client_added_signal(client)

3571

3071

# Need to initiate checking of clients

3572

3072

if client.enabled:

3573

3073

client.init_checker()

3574

3074

3575

3075

tcp_server.enable()

3576

3076

tcp_server.server_activate()

3577

3077

3578

3078

# Find out what port we got

3579

3079

if zeroconf:

3580

3080

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

3585

3085

else: # IPv4

3586

3086

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

3587

3087

*tcp_server.socket.getsockname())

3588

3589

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

3590

3088

3089

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

3090

3591

3091

try:

3592

3092

if zeroconf:

3593

3093

# From the Avahi example code

3598

3098

cleanup()

3599

3099

sys.exit(1)

3600

3100

# End of Avahi example code

3601

3602

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

3603

lambda *args, **kwargs:

3604

(tcp_server.handle_request

3605

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

3606

3101

3102

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

3103

lambda *args, **kwargs:

3104

(tcp_server.handle_request

3105

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

3106

3607

3107

logger.debug("Starting main loop")

3608

3108

main_loop.run()

3609

3109

except AvahiError as error: