/mandos/release : revision 237.7.671

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#!/usr/bin/python2.7

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#!/usr/bin/python

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

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#

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#

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

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#

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#

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

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# service publisher, downloaded from

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

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

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

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

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#

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#

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# Everything else is

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#

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

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

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#

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# This file is part of Mandos.

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#

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

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

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

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# (at your option) any later version.

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#

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

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

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

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# WITHOUT ANY WARRANTY; without even the implied warranty of

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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

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# GNU General Public License for more details.

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#

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#

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

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# along with this program. If not, see

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

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#

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

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#

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

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#

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#

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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from future_builtins import *

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try:

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from future_builtins import *

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except ImportError:

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pass

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try:

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import SocketServer as socketserver

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import argparse

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import datetime

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import errno

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import gnutls.crypto

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import gnutls.connection

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import gnutls.errors

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import gnutls.library.functions

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import gnutls.library.constants

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import gnutls.library.types

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try:

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import ConfigParser as configparser

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except ImportError:

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import dbus

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import dbus.service

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try:

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import gobject

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except ImportError:

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from gi.repository import GObject as gobject

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import avahi

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from gi.repository import GLib

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from dbus.mainloop.glib import DBusGMainLoop

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import ctypes

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import ctypes.util

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import xml.dom.minidom

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import inspect

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# Try to find the value of SO_BINDTODEVICE:

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try:

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

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

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except AttributeError:

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try:

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# This is where SO_BINDTODEVICE was up to and including Python

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# 2.6, and also 3.2:

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from IN import SO_BINDTODEVICE

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except ImportError:

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SO_BINDTODEVICE = None

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

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# Try running the C preprocessor:

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try:

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

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"/dev/stdin"],

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stdin=subprocess.PIPE,

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stdout=subprocess.PIPE)

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stdout = cc.communicate(

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

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

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except (OSError, ValueError, IndexError):

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# No value found

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SO_BINDTODEVICE = None

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if sys.version_info.major == 2:

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str = unicode

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version = "1.6.9"

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version = "1.8.4"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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if_nametoindex = ctypes.cdll.LoadLibrary(

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

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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

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

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return interface_index

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def copy_function(func):

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"""Make a copy of a function"""

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if sys.version_info.major == 2:

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return types.FunctionType(func.func_code,

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func.func_globals,

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func.func_name,

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func.func_defaults,

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func.func_closure)

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else:

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return types.FunctionType(func.__code__,

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func.__globals__,

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func.__name__,

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func.__defaults__,

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func.__closure__)

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def initlogger(debug, level=logging.WARNING):

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"""init logger and add loglevel"""

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global syslogger

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syslogger = (logging.handlers.SysLogHandler(

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facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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address = "/dev/log"))

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facility=logging.handlers.SysLogHandler.LOG_DAEMON,

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address="/dev/log"))

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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

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class PGPEngine(object):

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

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def __init__(self):

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self.tempdir = tempfile.mkdtemp(prefix="mandos-")

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self.gpg = "gpg"

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try:

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output = subprocess.check_output(["gpgconf"])

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for line in output.splitlines():

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name, text, path = line.split(b":")

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if name == "gpg":

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self.gpg = path

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break

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except OSError as e:

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if e.errno != errno.ENOENT:

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raise

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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--homedir', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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'--quiet']

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

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

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

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def __enter__(self):

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return self

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

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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

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topdown = False):

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topdown=False):

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for filename in files:

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

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for dirname in dirs:

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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

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

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

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

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return encoded

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def encrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(

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dir=self.tempdir) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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stdin=subprocess.PIPE,

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stdout=subprocess.PIPE,

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stderr=subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(

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dir = self.tempdir) as passfile:

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dir=self.tempdir) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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stdin=subprocess.PIPE,

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stdout=subprocess.PIPE,

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stderr=subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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# Pretend that we have an Avahi module

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class avahi(object):

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

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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"

285

DBUS_INTERFACE_ENTRY_GROUP = DBUS_NAME + ".EntryGroup"

286

DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"

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DBUS_PATH_SERVER = "/"

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@staticmethod

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def string_array_to_txt_array(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

295

ENTRY_GROUP_FAILURE = 4 # avahi-common/defs.h

296

SERVER_INVALID = 0 # avahi-common/defs.h

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SERVER_REGISTERING = 1 # avahi-common/defs.h

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SERVER_RUNNING = 2 # avahi-common/defs.h

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SERVER_COLLISION = 3 # avahi-common/defs.h

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SERVER_FAILURE = 4 # avahi-common/defs.h

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class AvahiError(Exception):

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

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self.value = value

251

317

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class AvahiService(object):

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"""An Avahi (Zeroconf) service.

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321

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,

274

interface = avahi.IF_UNSPEC,

275

name = None,

276

servicetype = None,

277

port = None,

278

TXT = None,

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domain = "",

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host = "",

281

max_renames = 32768,

282

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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361

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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398

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def add(self):

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

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self.remove()

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

359

425

360

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if state == avahi.ENTRY_GROUP_ESTABLISHED:

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logger.debug("Zeroconf service established.")

362

428

elif state == avahi.ENTRY_GROUP_COLLISION:

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432

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

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433

str(error))

368

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

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370

436

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"""

383

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

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

413

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else:

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480

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

415

481

416

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def activate(self):

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

418

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if self.server is None:

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495

class AvahiServiceToSyslog(AvahiService):

430

496

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

431

497

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

432

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

498

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

433

499

syslogger.setFormatter(logging.Formatter(

434

500

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

435

501

.format(self.name)))

436

502

return ret

437

503

504

505

# Pretend that we have a GnuTLS module

506

class gnutls(object):

507

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

508

509

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

510

if library is None:

511

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

512

_library = ctypes.cdll.LoadLibrary(library)

513

del library

514

515

# Unless otherwise indicated, the constants and types below are

516

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

517

518

# Constants

519

E_SUCCESS = 0

520

E_INTERRUPTED = -52

521

E_AGAIN = -28

522

CRT_OPENPGP = 2

523

CRT_RAWPK = 3

524

CLIENT = 2

525

SHUT_RDWR = 0

526

CRD_CERTIFICATE = 1

527

E_NO_CERTIFICATE_FOUND = -49

528

X509_FMT_DER = 0

529

NO_TICKETS = 1<<10

530

ENABLE_RAWPK = 1<<18

531

CTYPE_PEERS = 3

532

KEYID_USE_SHA256 = 1 # gnutls/x509.h

533

OPENPGP_FMT_RAW = 0 # gnutls/openpgp.h

534

535

# Types

536

class session_int(ctypes.Structure):

537

_fields_ = []

538

session_t = ctypes.POINTER(session_int)

539

540

class certificate_credentials_st(ctypes.Structure):

541

_fields_ = []

542

certificate_credentials_t = ctypes.POINTER(

543

certificate_credentials_st)

544

certificate_type_t = ctypes.c_int

545

546

class datum_t(ctypes.Structure):

547

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

548

('size', ctypes.c_uint)]

549

550

class openpgp_crt_int(ctypes.Structure):

551

_fields_ = []

552

openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)

553

openpgp_crt_fmt_t = ctypes.c_int # gnutls/openpgp.h

554

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

555

credentials_type_t = ctypes.c_int

556

transport_ptr_t = ctypes.c_void_p

557

close_request_t = ctypes.c_int

558

559

# Exceptions

560

class Error(Exception):

561

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

562

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

563

# code is passed, convert it to a string with

564

# gnutls.strerror()

565

self.code = code

566

if message is None and code is not None:

567

message = gnutls.strerror(code)

568

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

569

message, *args)

570

571

class CertificateSecurityError(Error):

572

pass

573

574

# Classes

575

class Credentials(object):

576

def __init__(self):

577

self._c_object = gnutls.certificate_credentials_t()

578

gnutls.certificate_allocate_credentials(

579

ctypes.byref(self._c_object))

580

self.type = gnutls.CRD_CERTIFICATE

581

582

def __del__(self):

583

gnutls.certificate_free_credentials(self._c_object)

584

585

class ClientSession(object):

586

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

587

self._c_object = gnutls.session_t()

588

gnutls_flags = gnutls.CLIENT

589

if gnutls.check_version("3.5.6"):

590

gnutls_flags |= gnutls.NO_TICKETS

591

if gnutls.has_rawpk:

592

gnutls_flags |= gnutls.ENABLE_RAWPK

593

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

594

del gnutls_flags

595

gnutls.set_default_priority(self._c_object)

596

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

597

gnutls.handshake_set_private_extensions(self._c_object,

598

True)

599

self.socket = socket

600

if credentials is None:

601

credentials = gnutls.Credentials()

602

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

603

ctypes.cast(credentials._c_object,

604

ctypes.c_void_p))

605

self.credentials = credentials

606

607

def __del__(self):

608

gnutls.deinit(self._c_object)

609

610

def handshake(self):

611

return gnutls.handshake(self._c_object)

612

613

def send(self, data):

614

data = bytes(data)

615

data_len = len(data)

616

while data_len > 0:

617

data_len -= gnutls.record_send(self._c_object,

618

data[-data_len:],

619

data_len)

620

621

def bye(self):

622

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

623

624

# Error handling functions

625

def _error_code(result):

626

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

627

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

628

if result >= 0:

629

return result

630

if result == gnutls.E_NO_CERTIFICATE_FOUND:

631

raise gnutls.CertificateSecurityError(code=result)

632

raise gnutls.Error(code=result)

633

634

def _retry_on_error(result, func, arguments):

635

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

636

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

637

while result < 0:

638

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

639

return _error_code(result)

640

result = func(*arguments)

641

return result

642

643

# Unless otherwise indicated, the function declarations below are

644

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

645

646

# Functions

647

priority_set_direct = _library.gnutls_priority_set_direct

648

priority_set_direct.argtypes = [session_t, ctypes.c_char_p,

649

ctypes.POINTER(ctypes.c_char_p)]

650

priority_set_direct.restype = _error_code

651

652

init = _library.gnutls_init

653

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

654

init.restype = _error_code

655

656

set_default_priority = _library.gnutls_set_default_priority

657

set_default_priority.argtypes = [session_t]

658

set_default_priority.restype = _error_code

659

660

record_send = _library.gnutls_record_send

661

record_send.argtypes = [session_t, ctypes.c_void_p,

662

ctypes.c_size_t]

663

record_send.restype = ctypes.c_ssize_t

664

record_send.errcheck = _retry_on_error

665

666

certificate_allocate_credentials = (

667

_library.gnutls_certificate_allocate_credentials)

668

certificate_allocate_credentials.argtypes = [

669

ctypes.POINTER(certificate_credentials_t)]

670

certificate_allocate_credentials.restype = _error_code

671

672

certificate_free_credentials = (

673

_library.gnutls_certificate_free_credentials)

674

certificate_free_credentials.argtypes = [

675

certificate_credentials_t]

676

certificate_free_credentials.restype = None

677

678

handshake_set_private_extensions = (

679

_library.gnutls_handshake_set_private_extensions)

680

handshake_set_private_extensions.argtypes = [session_t,

681

ctypes.c_int]

682

handshake_set_private_extensions.restype = None

683

684

credentials_set = _library.gnutls_credentials_set

685

credentials_set.argtypes = [session_t, credentials_type_t,

686

ctypes.c_void_p]

687

credentials_set.restype = _error_code

688

689

strerror = _library.gnutls_strerror

690

strerror.argtypes = [ctypes.c_int]

691

strerror.restype = ctypes.c_char_p

692

693

certificate_type_get = _library.gnutls_certificate_type_get

694

certificate_type_get.argtypes = [session_t]

695

certificate_type_get.restype = _error_code

696

697

certificate_get_peers = _library.gnutls_certificate_get_peers

698

certificate_get_peers.argtypes = [session_t,

699

ctypes.POINTER(ctypes.c_uint)]

700

certificate_get_peers.restype = ctypes.POINTER(datum_t)

701

702

global_set_log_level = _library.gnutls_global_set_log_level

703

global_set_log_level.argtypes = [ctypes.c_int]

704

global_set_log_level.restype = None

705

706

global_set_log_function = _library.gnutls_global_set_log_function

707

global_set_log_function.argtypes = [log_func]

708

global_set_log_function.restype = None

709

710

deinit = _library.gnutls_deinit

711

deinit.argtypes = [session_t]

712

deinit.restype = None

713

714

handshake = _library.gnutls_handshake

715

handshake.argtypes = [session_t]

716

handshake.restype = _error_code

717

handshake.errcheck = _retry_on_error

718

719

transport_set_ptr = _library.gnutls_transport_set_ptr

720

transport_set_ptr.argtypes = [session_t, transport_ptr_t]

721

transport_set_ptr.restype = None

722

723

bye = _library.gnutls_bye

724

bye.argtypes = [session_t, close_request_t]

725

bye.restype = _error_code

726

bye.errcheck = _retry_on_error

727

728

check_version = _library.gnutls_check_version

729

check_version.argtypes = [ctypes.c_char_p]

730

check_version.restype = ctypes.c_char_p

731

732

_need_version = b"3.3.0"

733

if check_version(_need_version) is None:

734

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

735

.format(_need_version))

736

737

_tls_rawpk_version = b"3.6.6"

738

has_rawpk = bool(check_version(_tls_rawpk_version))

739

740

if has_rawpk:

741

# Types

742

class pubkey_st(ctypes.Structure):

743

_fields = []

744

pubkey_t = ctypes.POINTER(pubkey_st)

745

746

x509_crt_fmt_t = ctypes.c_int

747

748

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

749

pubkey_init = _library.gnutls_pubkey_init

750

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

751

pubkey_init.restype = _error_code

752

753

pubkey_import = _library.gnutls_pubkey_import

754

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

755

x509_crt_fmt_t]

756

pubkey_import.restype = _error_code

757

758

pubkey_get_key_id = _library.gnutls_pubkey_get_key_id

759

pubkey_get_key_id.argtypes = [pubkey_t, ctypes.c_int,

760

ctypes.POINTER(ctypes.c_ubyte),

761

ctypes.POINTER(ctypes.c_size_t)]

762

pubkey_get_key_id.restype = _error_code

763

764

pubkey_deinit = _library.gnutls_pubkey_deinit

765

pubkey_deinit.argtypes = [pubkey_t]

766

pubkey_deinit.restype = None

767

else:

768

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

769

770

openpgp_crt_init = _library.gnutls_openpgp_crt_init

771

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

772

openpgp_crt_init.restype = _error_code

773

774

openpgp_crt_import = _library.gnutls_openpgp_crt_import

775

openpgp_crt_import.argtypes = [openpgp_crt_t,

776

ctypes.POINTER(datum_t),

777

openpgp_crt_fmt_t]

778

openpgp_crt_import.restype = _error_code

779

780

openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self

781

openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,

782

ctypes.POINTER(ctypes.c_uint)]

783

openpgp_crt_verify_self.restype = _error_code

784

785

openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit

786

openpgp_crt_deinit.argtypes = [openpgp_crt_t]

787

openpgp_crt_deinit.restype = None

788

789

openpgp_crt_get_fingerprint = (

790

_library.gnutls_openpgp_crt_get_fingerprint)

791

openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,

792

ctypes.c_void_p,

793

ctypes.POINTER(

794

ctypes.c_size_t)]

795

openpgp_crt_get_fingerprint.restype = _error_code

796

797

if check_version("3.6.4"):

798

certificate_type_get2 = _library.gnutls_certificate_type_get2

799

certificate_type_get2.argtypes = [session_t, ctypes.c_int]

800

certificate_type_get2.restype = _error_code

801

802

# Remove non-public functions

803

del _error_code, _retry_on_error

804

805

438

806

def call_pipe(connection, # : multiprocessing.Connection

439

807

func, *args, **kwargs):

440

808

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

441

809

442

810

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

443

811

return value on the provided multiprocessing.Connection.

444

812

"""

445

813

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

446

814

connection.close()

447

815

816

448

817

class Client(object):

449

818

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

450

819

451

820

Attributes:

452

821

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

453

822

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

455

824

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

456

825

to see if the client lives.

457

826

'None' if no process is running.

458

checker_callback_tag: a gobject event source tag, or None

827

checker_callback_tag: a GLib event source tag, or None

459

828

checker_command: string; External command which is run to check

460

829

if client lives. %() expansions are done at

461

830

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

462

831

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

463

checker_initiator_tag: a gobject event source tag, or None

832

checker_initiator_tag: a GLib event source tag, or None

464

833

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

465

834

client_structure: Object describing what attributes a client has

466

835

and is used for storing the client at exit

467

836

current_checker_command: string; current running checker_command

468

disable_initiator_tag: a gobject event source tag, or None

837

disable_initiator_tag: a GLib event source tag, or None

469

838

enabled: bool()

470

839

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

471

uniquely identify the client

840

uniquely identify an OpenPGP client

841

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

842

a client using raw public keys

472

843

host: string; available for use by the checker command

473

844

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

474

845

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

490

861

disabled, or None

491

862

server_settings: The server_settings dict from main()

492

863

"""

493

864

494

865

runtime_expansions = ("approval_delay", "approval_duration",

495

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

866

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

496

867

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

497

868

"last_approval_request", "last_checked_ok",

498

869

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

507

878

"approved_by_default": "True",

508

879

"enabled": "True",

509

880

}

510

881

511

882

@staticmethod

512

883

def config_parser(config):

513

884

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

520

891

for client_name in config.sections():

521

892

section = dict(config.items(client_name))

522

893

client = settings[client_name] = {}

523

894

524

895

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

525

896

# Reformat values from string types to Python types

526

897

client["approved_by_default"] = config.getboolean(

527

898

client_name, "approved_by_default")

528

899

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

529

900

"enabled")

530

531

# Uppercase and remove spaces from fingerprint for later

532

# comparison purposes with return value from the

533

# fingerprint() function

901

902

# Uppercase and remove spaces from key_id and fingerprint

903

# for later comparison purposes with return value from the

904

# key_id() and fingerprint() functions

905

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

906

.replace(" ", ""))

534

907

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

535

908

.replace(" ", ""))

536

909

if "secret" in section:

537

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

910

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

911

.encode("utf-8"),

912

"base64")

538

913

elif "secfile" in section:

539

914

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

540

915

(section["secfile"])),

555

930

client["last_approval_request"] = None

556

931

client["last_checked_ok"] = None

557

932

client["last_checker_status"] = -2

558

933

559

934

return settings

560

561

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

935

936

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

562

937

self.name = name

563

938

if server_settings is None:

564

939

server_settings = {}

566

941

# adding all client settings

567

942

for setting, value in settings.items():

568

943

setattr(self, setting, value)

569

944

570

945

if self.enabled:

571

946

if not hasattr(self, "last_enabled"):

572

947

self.last_enabled = datetime.datetime.utcnow()

576

951

else:

577

952

self.last_enabled = None

578

953

self.expires = None

579

954

580

955

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

956

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

581

957

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

582

958

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

583

959

datetime.datetime.utcnow())

584

960

585

961

# attributes specific for this server instance

586

962

self.checker = None

587

963

self.checker_initiator_tag = None

593

969

self.changedstate = multiprocessing_manager.Condition(

594

970

multiprocessing_manager.Lock())

595

971

self.client_structure = [attr

596

for attr in self.__dict__.iterkeys()

972

for attr in self.__dict__.keys()

597

973

if not attr.startswith("_")]

598

974

self.client_structure.append("client_structure")

599

975

600

976

for name, t in inspect.getmembers(

601

977

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

602

978

if not name.startswith("_"):

603

979

self.client_structure.append(name)

604

980

605

981

# Send notice to process children that client state has changed

606

982

def send_changedstate(self):

607

983

with self.changedstate:

608

984

self.changedstate.notify_all()

609

985

610

986

def enable(self):

611

987

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

612

988

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

617

993

self.last_enabled = datetime.datetime.utcnow()

618

994

self.init_checker()

619

995

self.send_changedstate()

620

996

621

997

def disable(self, quiet=True):

622

998

"""Disable this client."""

623

999

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

625

1001

if not quiet:

626

1002

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

627

1003

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

628

gobject.source_remove(self.disable_initiator_tag)

1004

GLib.source_remove(self.disable_initiator_tag)

629

1005

self.disable_initiator_tag = None

630

1006

self.expires = None

631

1007

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

632

gobject.source_remove(self.checker_initiator_tag)

1008

GLib.source_remove(self.checker_initiator_tag)

633

1009

self.checker_initiator_tag = None

634

1010

self.stop_checker()

635

1011

self.enabled = False

636

1012

if not quiet:

637

1013

self.send_changedstate()

638

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

1014

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

639

1015

return False

640

1016

641

1017

def __del__(self):

642

1018

self.disable()

643

1019

644

1020

def init_checker(self):

645

1021

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

646

1022

# and every interval from then on.

647

1023

if self.checker_initiator_tag is not None:

648

gobject.source_remove(self.checker_initiator_tag)

649

self.checker_initiator_tag = gobject.timeout_add(

1024

GLib.source_remove(self.checker_initiator_tag)

1025

self.checker_initiator_tag = GLib.timeout_add(

650

1026

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

651

1027

self.start_checker)

652

1028

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

653

1029

if self.disable_initiator_tag is not None:

654

gobject.source_remove(self.disable_initiator_tag)

655

self.disable_initiator_tag = gobject.timeout_add(

1030

GLib.source_remove(self.disable_initiator_tag)

1031

self.disable_initiator_tag = GLib.timeout_add(

656

1032

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

657

1033

# Also start a new checker *right now*.

658

1034

self.start_checker()

659

1035

660

1036

def checker_callback(self, source, condition, connection,

661

1037

command):

662

1038

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

665

1041

# Read return code from connection (see call_pipe)

666

1042

returncode = connection.recv()

667

1043

connection.close()

668

1044

669

1045

if returncode >= 0:

670

1046

self.last_checker_status = returncode

671

1047

self.last_checker_signal = None

681

1057

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

682

1058

vars(self))

683

1059

return False

684

1060

685

1061

def checked_ok(self):

686

1062

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

687

1063

self.last_checked_ok = datetime.datetime.utcnow()

688

1064

self.last_checker_status = 0

689

1065

self.last_checker_signal = None

690

1066

self.bump_timeout()

691

1067

692

1068

def bump_timeout(self, timeout=None):

693

1069

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

694

1070

if timeout is None:

695

1071

timeout = self.timeout

696

1072

if self.disable_initiator_tag is not None:

697

gobject.source_remove(self.disable_initiator_tag)

1073

GLib.source_remove(self.disable_initiator_tag)

698

1074

self.disable_initiator_tag = None

699

1075

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

700

self.disable_initiator_tag = gobject.timeout_add(

1076

self.disable_initiator_tag = GLib.timeout_add(

701

1077

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

702

1078

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

703

1079

704

1080

def need_approval(self):

705

1081

self.last_approval_request = datetime.datetime.utcnow()

706

1082

707

1083

def start_checker(self):

708

1084

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

709

1085

710

1086

If a checker already exists, leave it running and do

711

1087

nothing."""

712

1088

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

717

1093

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

718

1094

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

719

1095

# should be.

720

1096

721

1097

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

722

1098

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

723

1099

self.checker.join()

727

1103

# Escape attributes for the shell

728

1104

escaped_attrs = {

729

1105

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

730

for attr in self.runtime_expansions }

1106

for attr in self.runtime_expansions}

731

1107

try:

732

1108

command = self.checker_command % escaped_attrs

733

1109

except TypeError as error:

745

1121

# The exception is when not debugging but nevertheless

746

1122

# running in the foreground; use the previously

747

1123

# created wnull.

748

popen_args = { "close_fds": True,

749

"shell": True,

750

"cwd": "/" }

1124

popen_args = {"close_fds": True,

1125

"shell": True,

1126

"cwd": "/"}

751

1127

if (not self.server_settings["debug"]

752

1128

and self.server_settings["foreground"]):

753

1129

popen_args.update({"stdout": wnull,

754

"stderr": wnull })

755

pipe = multiprocessing.Pipe(duplex = False)

1130

"stderr": wnull})

1131

pipe = multiprocessing.Pipe(duplex=False)

756

1132

self.checker = multiprocessing.Process(

757

target = call_pipe,

758

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

759

kwargs = popen_args)

1133

target=call_pipe,

1134

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

1135

kwargs=popen_args)

760

1136

self.checker.start()

761

self.checker_callback_tag = gobject.io_add_watch(

762

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

1137

self.checker_callback_tag = GLib.io_add_watch(

1138

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

763

1139

self.checker_callback, pipe[0], command)

764

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

1140

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

765

1141

return True

766

1142

767

1143

def stop_checker(self):

768

1144

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

769

1145

if self.checker_callback_tag:

770

gobject.source_remove(self.checker_callback_tag)

1146

GLib.source_remove(self.checker_callback_tag)

771

1147

self.checker_callback_tag = None

772

1148

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

773

1149

return

782

1158

byte_arrays=False):

783

1159

"""Decorators for marking methods of a DBusObjectWithProperties to

784

1160

become properties on the D-Bus.

785

1161

786

1162

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

787

1163

and with one argument by "Set".

788

1164

789

1165

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

790

1166

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

791

1167

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

795

1171

if byte_arrays and signature != "ay":

796

1172

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

797

1173

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

798

1174

799

1175

def decorator(func):

800

1176

func._dbus_is_property = True

801

1177

func._dbus_interface = dbus_interface

804

1180

func._dbus_name = func.__name__

805

1181

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

806

1182

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

807

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

1183

func._dbus_get_args_options = {'byte_arrays': byte_arrays}

808

1184

return func

809

1185

810

1186

return decorator

811

1187

812

1188

813

1189

def dbus_interface_annotations(dbus_interface):

814

1190

"""Decorator for marking functions returning interface annotations

815

1191

816

1192

Usage:

817

1193

818

1194

@dbus_interface_annotations("org.example.Interface")

819

1195

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

820

1196

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

821

1197

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

822

1198

"false"}

823

1199

"""

824

1200

825

1201

def decorator(func):

826

1202

func._dbus_is_interface = True

827

1203

func._dbus_interface = dbus_interface

828

1204

func._dbus_name = dbus_interface

829

1205

return func

830

1206

831

1207

return decorator

832

1208

833

1209

834

1210

def dbus_annotations(annotations):

835

1211

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

836

1212

Usage:

837

1213

838

1214

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

839

1215

"org.freedesktop.DBus.Property."

840

1216

"EmitsChangedSignal": "false"})

842

1218

access="r")

843

1219

def Property_dbus_property(self):

844

1220

return dbus.Boolean(False)

845

1221

846

1222

See also the DBusObjectWithAnnotations class.

847

1223

"""

848

1224

849

1225

def decorator(func):

850

1226

func._dbus_annotations = annotations

851

1227

return func

852

1228

853

1229

return decorator

854

1230

855

1231

873

1249

874

1250

class DBusObjectWithAnnotations(dbus.service.Object):

875

1251

"""A D-Bus object with annotations.

876

1252

877

1253

Classes inheriting from this can use the dbus_annotations

878

1254

decorator to add annotations to methods or signals.

879

1255

"""

880

1256

881

1257

@staticmethod

882

1258

def _is_dbus_thing(thing):

883

1259

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

884

1260

885

1261

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

886

1262

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

887

1263

"""

888

1264

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

889

1265

False)

890

1266

891

1267

def _get_all_dbus_things(self, thing):

892

1268

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

893

1269

"""

896

1272

for cls in self.__class__.__mro__

897

1273

for name, athing in

898

1274

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

899

1275

900

1276

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

901

out_signature = "s",

902

path_keyword = 'object_path',

903

connection_keyword = 'connection')

1277

out_signature="s",

1278

path_keyword='object_path',

1279

connection_keyword='connection')

904

1280

def Introspect(self, object_path, connection):

905

1281

"""Overloading of standard D-Bus method.

906

1282

907

1283

Inserts annotation tags on methods and signals.

908

1284

"""

909

1285

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

910

1286

connection)

911

1287

try:

912

1288

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

913

1289

914

1290

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

915

1291

# Add annotation tags

916

1292

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

943

1319

if_tag.appendChild(ann_tag)

944

1320

# Fix argument name for the Introspect method itself

945

1321

if (if_tag.getAttribute("name")

946

== dbus.INTROSPECTABLE_IFACE):

1322

== dbus.INTROSPECTABLE_IFACE):

947

1323

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

948

1324

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

949

1325

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

962

1338

963

1339

class DBusObjectWithProperties(DBusObjectWithAnnotations):

964

1340

"""A D-Bus object with properties.

965

1341

966

1342

Classes inheriting from this can use the dbus_service_property

967

1343

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

968

1344

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

969

1345

"""

970

1346

971

1347

def _get_dbus_property(self, interface_name, property_name):

972

1348

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

973

1349

property with the specified name and interface.

978

1354

if (value._dbus_name == property_name

979

1355

and value._dbus_interface == interface_name):

980

1356

return value.__get__(self)

981

1357

982

1358

# No such property

983

1359

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

984

1360

self.dbus_object_path, interface_name, property_name))

985

1361

986

1362

@classmethod

987

1363

def _get_all_interface_names(cls):

988

1364

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

991

1367

for x in (inspect.getmro(cls))

992

1368

for attr in dir(x))

993

1369

if name is not None)

994

1370

995

1371

@dbus.service.method(dbus.PROPERTIES_IFACE,

996

1372

in_signature="ss",

997

1373

out_signature="v")

1005

1381

if not hasattr(value, "variant_level"):

1006

1382

return value

1007

1383

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

1008

1384

1009

1385

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

1010

1386

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

1011

1387

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

1023

1399

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

1024

1400

for byte in value))

1025

1401

prop(value)

1026

1402

1027

1403

@dbus.service.method(dbus.PROPERTIES_IFACE,

1028

1404

in_signature="s",

1029

1405

out_signature="a{sv}")

1030

1406

def GetAll(self, interface_name):

1031

1407

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

1032

1408

standard.

1033

1409

1034

1410

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

1035

1411

"""

1036

1412

properties = {}

1047

1423

properties[name] = value

1048

1424

continue

1049

1425

properties[name] = type(value)(

1050

value, variant_level = value.variant_level + 1)

1426

value, variant_level=value.variant_level + 1)

1051

1427

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

1052

1428

1053

1429

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

1054

1430

def PropertiesChanged(self, interface_name, changed_properties,

1055

1431

invalidated_properties):

1057

1433

standard.

1058

1434

"""

1059

1435

pass

1060

1436

1061

1437

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1062

1438

out_signature="s",

1063

1439

path_keyword='object_path',

1064

1440

connection_keyword='connection')

1065

1441

def Introspect(self, object_path, connection):

1066

1442

"""Overloading of standard D-Bus method.

1067

1443

1068

1444

Inserts property tags and interface annotation tags.

1069

1445

"""

1070

1446

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1072

1448

connection)

1073

1449

try:

1074

1450

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

1075

1451

1076

1452

def make_tag(document, name, prop):

1077

1453

e = document.createElement("property")

1078

1454

e.setAttribute("name", name)

1079

1455

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

1080

1456

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

1081

1457

return e

1082

1458

1083

1459

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

1084

1460

# Add property tags

1085

1461

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

1127

1503

exc_info=error)

1128

1504

return xmlstring

1129

1505

1506

1130

1507

try:

1131

1508

dbus.OBJECT_MANAGER_IFACE

1132

1509

except AttributeError:

1133

1510

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

1134

1511

1512

1135

1513

class DBusObjectWithObjectManager(DBusObjectWithAnnotations):

1136

1514

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

1137

1515

1138

1516

Classes inheriting from this exposes the standard

1139

1517

GetManagedObjects call and the InterfacesAdded and

1140

1518

InterfacesRemoved signals on the standard

1141

1519

"org.freedesktop.DBus.ObjectManager" interface.

1142

1520

1143

1521

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

1144

1522

manually.

1145

1523

"""

1146

1524

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

1147

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

1525

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

1148

1526

def GetManagedObjects(self):

1149

1527

"""This function must be overridden"""

1150

1528

raise NotImplementedError()

1151

1529

1152

1530

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,

1153

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

1531

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

1154

1532

def InterfacesAdded(self, object_path, interfaces_and_properties):

1155

1533

pass

1156

1157

@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,

1158

signature = "oas")

1534

1535

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

1159

1536

def InterfacesRemoved(self, object_path, interfaces):

1160

1537

pass

1161

1538

1162

1539

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

1163

out_signature = "s",

1164

path_keyword = 'object_path',

1165

connection_keyword = 'connection')

1540

out_signature="s",

1541

path_keyword='object_path',

1542

connection_keyword='connection')

1166

1543

def Introspect(self, object_path, connection):

1167

1544

"""Overloading of standard D-Bus method.

1168

1545

1169

1546

Override return argument name of GetManagedObjects to be

1170

1547

"objpath_interfaces_and_properties"

1171

1548

"""

1172

xmlstring = DBusObjectWithAnnotations(self, object_path,

1173

connection)

1549

xmlstring = DBusObjectWithAnnotations.Introspect(self,

1550

object_path,

1551

connection)

1174

1552

try:

1175

1553

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

1176

1554

1177

1555

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

1178

1556

# Fix argument name for the GetManagedObjects method

1179

1557

if (if_tag.getAttribute("name")

1180

== dbus.OBJECT_MANAGER_IFACE):

1558

== dbus.OBJECT_MANAGER_IFACE):

1181

1559

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

1182

1560

if (cn.getAttribute("name")

1183

1561

== "GetManagedObjects"):

1193

1571

except (AttributeError, xml.dom.DOMException,

1194

1572

xml.parsers.expat.ExpatError) as error:

1195

1573

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

1196

exc_info = error)

1574

exc_info=error)

1197

1575

return xmlstring

1198

1576

1577

1199

1578

def datetime_to_dbus(dt, variant_level=0):

1200

1579

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

1201

1580

if dt is None:

1202

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

1581

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

1203

1582

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

1204

1583

1205

1584

1208

1587

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

1209

1588

interface names according to the "alt_interface_names" mapping.

1210

1589

Usage:

1211

1590

1212

1591

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

1213

1592

"net.example.AlternateInterface"})

1214

1593

class SampleDBusObject(dbus.service.Object):

1215

1594

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

1216

1595

def SampleDBusMethod():

1217

1596

pass

1218

1597

1219

1598

The above "SampleDBusMethod" on "SampleDBusObject" will be

1220

1599

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

1221

1600

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

1222

1601

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

1223

1602

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

1224

1603

1225

1604

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

1226

1605

(from DBusObjectWithProperties) and interfaces (from the

1227

1606

dbus_interface_annotations decorator).

1228

1607

"""

1229

1608

1230

1609

def wrapper(cls):

1231

1610

for orig_interface_name, alt_interface_name in (

1232

1611

alt_interface_names.items()):

1247

1626

interface_names.add(alt_interface)

1248

1627

# Is this a D-Bus signal?

1249

1628

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

1629

# Extract the original non-method undecorated

1630

# function by black magic

1250

1631

if sys.version_info.major == 2:

1251

# Extract the original non-method undecorated

1252

# function by black magic

1253

1632

nonmethod_func = (dict(

1254

1633

zip(attribute.func_code.co_freevars,

1255

1634

attribute.__closure__))

1256

1635

["func"].cell_contents)

1257

1636

else:

1258

nonmethod_func = attribute

1637

nonmethod_func = (dict(

1638

zip(attribute.__code__.co_freevars,

1639

attribute.__closure__))

1640

["func"].cell_contents)

1259

1641

# Create a new, but exactly alike, function

1260

1642

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

1261

1643

# with the alternate D-Bus interface name

1262

if sys.version_info.major == 2:

1263

new_function = types.FunctionType(

1264

nonmethod_func.func_code,

1265

nonmethod_func.func_globals,

1266

nonmethod_func.func_name,

1267

nonmethod_func.func_defaults,

1268

nonmethod_func.func_closure)

1269

else:

1270

new_function = types.FunctionType(

1271

nonmethod_func.__code__,

1272

nonmethod_func.__globals__,

1273

nonmethod_func.__name__,

1274

nonmethod_func.__defaults__,

1275

nonmethod_func.__closure__)

1644

new_function = copy_function(nonmethod_func)

1276

1645

new_function = (dbus.service.signal(

1277

1646

alt_interface,

1278

1647

attribute._dbus_signature)(new_function))

1282

1651

attribute._dbus_annotations)

1283

1652

except AttributeError:

1284

1653

pass

1654

1285

1655

# Define a creator of a function to call both the

1286

1656

# original and alternate functions, so both the

1287

1657

# original and alternate signals gets sent when

1290

1660

"""This function is a scope container to pass

1291

1661

func1 and func2 to the "call_both" function

1292

1662

outside of its arguments"""

1293

1663

1664

@functools.wraps(func2)

1294

1665

def call_both(*args, **kwargs):

1295

1666

"""This function will emit two D-Bus

1296

1667

signals by calling func1 and func2"""

1297

1668

func1(*args, **kwargs)

1298

1669

func2(*args, **kwargs)

1299

1670

# Make wrapper function look like a D-Bus

1671

# signal

1672

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

1673

if name.startswith("_dbus_"):

1674

setattr(call_both, name, attr)

1675

1300

1676

return call_both

1301

1677

# Create the "call_both" function and add it to

1302

1678

# the class

1312

1688

alt_interface,

1313

1689

attribute._dbus_in_signature,

1314

1690

attribute._dbus_out_signature)

1315

(types.FunctionType(attribute.func_code,

1316

attribute.func_globals,

1317

attribute.func_name,

1318

attribute.func_defaults,

1319

attribute.func_closure)))

1691

(copy_function(attribute)))

1320

1692

# Copy annotations, if any

1321

1693

try:

1322

1694

attr[attrname]._dbus_annotations = dict(

1334

1706

attribute._dbus_access,

1335

1707

attribute._dbus_get_args_options

1336

1708

["byte_arrays"])

1337

(types.FunctionType(

1338

attribute.func_code,

1339

attribute.func_globals,

1340

attribute.func_name,

1341

attribute.func_defaults,

1342

attribute.func_closure)))

1709

(copy_function(attribute)))

1343

1710

# Copy annotations, if any

1344

1711

try:

1345

1712

attr[attrname]._dbus_annotations = dict(

1354

1721

# to the class.

1355

1722

attr[attrname] = (

1356

1723

dbus_interface_annotations(alt_interface)

1357

(types.FunctionType(attribute.func_code,

1358

attribute.func_globals,

1359

attribute.func_name,

1360

attribute.func_defaults,

1361

attribute.func_closure)))

1724

(copy_function(attribute)))

1362

1725

if deprecate:

1363

1726

# Deprecate all alternate interfaces

1364

iname="_AlternateDBusNames_interface_annotation{}"

1727

iname = "_AlternateDBusNames_interface_annotation{}"

1365

1728

for interface_name in interface_names:

1366

1729

1367

1730

@dbus_interface_annotations(interface_name)

1368

1731

def func(self):

1369

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

1370

"true" }

1732

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

1733

"true"}

1371

1734

# Find an unused name

1372

1735

for aname in (iname.format(i)

1373

1736

for i in itertools.count()):

1377

1740

if interface_names:

1378

1741

# Replace the class with a new subclass of it with

1379

1742

# methods, signals, etc. as created above.

1380

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

1381

(cls, ), attr)

1743

if sys.version_info.major == 2:

1744

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

1745

(cls, ), attr)

1746

else:

1747

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

1748

(cls, ), attr)

1382

1749

return cls

1383

1750

1384

1751

return wrapper

1385

1752

1386

1753

1388

1755

"se.bsnet.fukt.Mandos"})

1389

1756

class ClientDBus(Client, DBusObjectWithProperties):

1390

1757

"""A Client class using D-Bus

1391

1758

1392

1759

Attributes:

1393

1760

dbus_object_path: dbus.ObjectPath

1394

1761

bus: dbus.SystemBus()

1395

1762

"""

1396

1763

1397

1764

runtime_expansions = (Client.runtime_expansions

1398

1765

+ ("dbus_object_path", ))

1399

1766

1400

1767

_interface = "se.recompile.Mandos.Client"

1401

1768

1402

1769

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

1403

1404

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

1770

1771

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

1405

1772

self.bus = bus

1406

1773

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

1407

1774

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

1413

1780

"/clients/" + client_object_name)

1414

1781

DBusObjectWithProperties.__init__(self, self.bus,

1415

1782

self.dbus_object_path)

1416

1783

1417

1784

def notifychangeproperty(transform_func, dbus_name,

1418

1785

type_func=lambda x: x,

1419

1786

variant_level=1,

1421

1788

_interface=_interface):

1422

1789

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

1423

1790

its changes to DBus.

1424

1791

1425

1792

transform_fun: Function that takes a value and a variant_level

1426

1793

and transforms it to a D-Bus type.

1427

1794

dbus_name: D-Bus name of the variable

1430

1797

variant_level: D-Bus variant level. Default: 1

1431

1798

"""

1432

1799

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

1433

1800

1434

1801

def setter(self, value):

1435

1802

if hasattr(self, "dbus_object_path"):

1436

1803

if (not hasattr(self, attrname) or

1443

1810

else:

1444

1811

dbus_value = transform_func(

1445

1812

type_func(value),

1446

variant_level = variant_level)

1813

variant_level=variant_level)

1447

1814

self.PropertyChanged(dbus.String(dbus_name),

1448

1815

dbus_value)

1449

1816

self.PropertiesChanged(

1450

1817

_interface,

1451

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

1452

dbus_value }),

1818

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

1819

dbus_value}),

1453

1820

dbus.Array())

1454

1821

setattr(self, attrname, value)

1455

1822

1456

1823

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

1457

1824

1458

1825

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1459

1826

approvals_pending = notifychangeproperty(dbus.Boolean,

1460

1827

"ApprovalPending",

1461

type_func = bool)

1828

type_func=bool)

1462

1829

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

1463

1830

last_enabled = notifychangeproperty(datetime_to_dbus,

1464

1831

"LastEnabled")

1465

1832

checker = notifychangeproperty(

1466

1833

dbus.Boolean, "CheckerRunning",

1467

type_func = lambda checker: checker is not None)

1834

type_func=lambda checker: checker is not None)

1468

1835

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1469

1836

"LastCheckedOK")

1470

1837

last_checker_status = notifychangeproperty(dbus.Int16,

1475

1842

"ApprovedByDefault")

1476

1843

approval_delay = notifychangeproperty(

1477

1844

dbus.UInt64, "ApprovalDelay",

1478

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

1845

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

1479

1846

approval_duration = notifychangeproperty(

1480

1847

dbus.UInt64, "ApprovalDuration",

1481

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

1848

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

1482

1849

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

1483

1850

timeout = notifychangeproperty(

1484

1851

dbus.UInt64, "Timeout",

1485

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

1852

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

1486

1853

extended_timeout = notifychangeproperty(

1487

1854

dbus.UInt64, "ExtendedTimeout",

1488

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

1855

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

1489

1856

interval = notifychangeproperty(

1490

1857

dbus.UInt64, "Interval",

1491

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

1858

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

1492

1859

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

1493

1860

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

1494

1861

invalidate_only=True)

1495

1862

1496

1863

del notifychangeproperty

1497

1864

1498

1865

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

1499

1866

try:

1500

1867

self.remove_from_connection()

1503

1870

if hasattr(DBusObjectWithProperties, "__del__"):

1504

1871

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

1505

1872

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

1506

1873

1507

1874

def checker_callback(self, source, condition,

1508

1875

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

1509

1876

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

1525

1892

| self.last_checker_signal),

1526

1893

dbus.String(command))

1527

1894

return ret

1528

1895

1529

1896

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

1530

1897

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

1531

1898

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

1535

1902

# Emit D-Bus signal

1536

1903

self.CheckerStarted(self.current_checker_command)

1537

1904

return r

1538

1905

1539

1906

def _reset_approved(self):

1540

1907

self.approved = None

1541

1908

return False

1542

1909

1543

1910

def approve(self, value=True):

1544

1911

self.approved = value

1545

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

1546

* 1000), self._reset_approved)

1912

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

1913

* 1000), self._reset_approved)

1547

1914

self.send_changedstate()

1548

1549

## D-Bus methods, signals & properties

1550

1551

## Interfaces

1552

1553

## Signals

1554

1915

1916

# D-Bus methods, signals & properties

1917

1918

# Interfaces

1919

1920

# Signals

1921

1555

1922

# CheckerCompleted - signal

1556

1923

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

1557

1924

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

1558

1925

"D-Bus signal"

1559

1926

pass

1560

1927

1561

1928

# CheckerStarted - signal

1562

1929

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

1563

1930

def CheckerStarted(self, command):

1564

1931

"D-Bus signal"

1565

1932

pass

1566

1933

1567

1934

# PropertyChanged - signal

1568

1935

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

1569

1936

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

1570

1937

def PropertyChanged(self, property, value):

1571

1938

"D-Bus signal"

1572

1939

pass

1573

1940

1574

1941

# GotSecret - signal

1575

1942

@dbus.service.signal(_interface)

1576

1943

def GotSecret(self):

1579

1946

server to mandos-client

1580

1947

"""

1581

1948

pass

1582

1949

1583

1950

# Rejected - signal

1584

1951

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

1585

1952

def Rejected(self, reason):

1586

1953

"D-Bus signal"

1587

1954

pass

1588

1955

1589

1956

# NeedApproval - signal

1590

1957

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

1591

1958

def NeedApproval(self, timeout, default):

1592

1959

"D-Bus signal"

1593

1960

return self.need_approval()

1594

1595

## Methods

1596

1961

1962

# Methods

1963

1597

1964

# Approve - method

1598

1965

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

1599

1966

def Approve(self, value):

1600

1967

self.approve(value)

1601

1968

1602

1969

# CheckedOK - method

1603

1970

@dbus.service.method(_interface)

1604

1971

def CheckedOK(self):

1605

1972

self.checked_ok()

1606

1973

1607

1974

# Enable - method

1608

1975

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

1609

1976

@dbus.service.method(_interface)

1610

1977

def Enable(self):

1611

1978

"D-Bus method"

1612

1979

self.enable()

1613

1980

1614

1981

# StartChecker - method

1615

1982

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

1616

1983

@dbus.service.method(_interface)

1617

1984

def StartChecker(self):

1618

1985

"D-Bus method"

1619

1986

self.start_checker()

1620

1987

1621

1988

# Disable - method

1622

1989

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

1623

1990

@dbus.service.method(_interface)

1624

1991

def Disable(self):

1625

1992

"D-Bus method"

1626

1993

self.disable()

1627

1994

1628

1995

# StopChecker - method

1629

1996

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

1630

1997

@dbus.service.method(_interface)

1631

1998

def StopChecker(self):

1632

1999

self.stop_checker()

1633

1634

## Properties

1635

2000

2001

# Properties

2002

1636

2003

# ApprovalPending - property

1637

2004

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

1638

2005

def ApprovalPending_dbus_property(self):

1639

2006

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

1640

2007

1641

2008

# ApprovedByDefault - property

1642

2009

@dbus_service_property(_interface,

1643

2010

signature="b",

1646

2013

if value is None: # get

1647

2014

return dbus.Boolean(self.approved_by_default)

1648

2015

self.approved_by_default = bool(value)

1649

2016

1650

2017

# ApprovalDelay - property

1651

2018

@dbus_service_property(_interface,

1652

2019

signature="t",

1656

2023

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

1657

2024

* 1000)

1658

2025

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

1659

2026

1660

2027

# ApprovalDuration - property

1661

2028

@dbus_service_property(_interface,

1662

2029

signature="t",

1666

2033

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

1667

2034

* 1000)

1668

2035

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

1669

2036

1670

2037

# Name - property

1671

2038

@dbus_annotations(

1672

2039

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

1673

2040

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

1674

2041

def Name_dbus_property(self):

1675

2042

return dbus.String(self.name)

1676

2043

2044

# KeyID - property

2045

@dbus_annotations(

2046

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

2047

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

2048

def KeyID_dbus_property(self):

2049

return dbus.String(self.key_id)

2050

1677

2051

# Fingerprint - property

1678

2052

@dbus_annotations(

1679

2053

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

1680

2054

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

1681

2055

def Fingerprint_dbus_property(self):

1682

2056

return dbus.String(self.fingerprint)

1683

2057

1684

2058

# Host - property

1685

2059

@dbus_service_property(_interface,

1686

2060

signature="s",

1689

2063

if value is None: # get

1690

2064

return dbus.String(self.host)

1691

2065

self.host = str(value)

1692

2066

1693

2067

# Created - property

1694

2068

@dbus_annotations(

1695

2069

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

1696

2070

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

1697

2071

def Created_dbus_property(self):

1698

2072

return datetime_to_dbus(self.created)

1699

2073

1700

2074

# LastEnabled - property

1701

2075

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

1702

2076

def LastEnabled_dbus_property(self):

1703

2077

return datetime_to_dbus(self.last_enabled)

1704

2078

1705

2079

# Enabled - property

1706

2080

@dbus_service_property(_interface,

1707

2081

signature="b",

1713

2087

self.enable()

1714

2088

else:

1715

2089

self.disable()

1716

2090

1717

2091

# LastCheckedOK - property

1718

2092

@dbus_service_property(_interface,

1719

2093

signature="s",

1723

2097

self.checked_ok()

1724

2098

return

1725

2099

return datetime_to_dbus(self.last_checked_ok)

1726

2100

1727

2101

# LastCheckerStatus - property

1728

2102

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

1729

2103

def LastCheckerStatus_dbus_property(self):

1730

2104

return dbus.Int16(self.last_checker_status)

1731

2105

1732

2106

# Expires - property

1733

2107

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

1734

2108

def Expires_dbus_property(self):

1735

2109

return datetime_to_dbus(self.expires)

1736

2110

1737

2111

# LastApprovalRequest - property

1738

2112

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

1739

2113

def LastApprovalRequest_dbus_property(self):

1740

2114

return datetime_to_dbus(self.last_approval_request)

1741

2115

1742

2116

# Timeout - property

1743

2117

@dbus_service_property(_interface,

1744

2118

signature="t",

1759

2133

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

1760

2134

is None):

1761

2135

return

1762

gobject.source_remove(self.disable_initiator_tag)

1763

self.disable_initiator_tag = gobject.timeout_add(

2136

GLib.source_remove(self.disable_initiator_tag)

2137

self.disable_initiator_tag = GLib.timeout_add(

1764

2138

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

1765

2139

self.disable)

1766

2140

1767

2141

# ExtendedTimeout - property

1768

2142

@dbus_service_property(_interface,

1769

2143

signature="t",

1773

2147

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

1774

2148

* 1000)

1775

2149

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

1776

2150

1777

2151

# Interval - property

1778

2152

@dbus_service_property(_interface,

1779

2153

signature="t",

1786

2160

return

1787

2161

if self.enabled:

1788

2162

# Reschedule checker run

1789

gobject.source_remove(self.checker_initiator_tag)

1790

self.checker_initiator_tag = gobject.timeout_add(

2163

GLib.source_remove(self.checker_initiator_tag)

2164

self.checker_initiator_tag = GLib.timeout_add(

1791

2165

value, self.start_checker)

1792

self.start_checker() # Start one now, too

1793

2166

self.start_checker() # Start one now, too

2167

1794

2168

# Checker - property

1795

2169

@dbus_service_property(_interface,

1796

2170

signature="s",

1799

2173

if value is None: # get

1800

2174

return dbus.String(self.checker_command)

1801

2175

self.checker_command = str(value)

1802

2176

1803

2177

# CheckerRunning - property

1804

2178

@dbus_service_property(_interface,

1805

2179

signature="b",

1811

2185

self.start_checker()

1812

2186

else:

1813

2187

self.stop_checker()

1814

2188

1815

2189

# ObjectPath - property

1816

2190

@dbus_annotations(

1817

2191

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

1818

2192

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

1819

2193

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

1820

2194

def ObjectPath_dbus_property(self):

1821

return self.dbus_object_path # is already a dbus.ObjectPath

1822

2195

return self.dbus_object_path # is already a dbus.ObjectPath

2196

1823

2197

# Secret = property

1824

2198

@dbus_annotations(

1825

2199

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

1830

2204

byte_arrays=True)

1831

2205

def Secret_dbus_property(self, value):

1832

2206

self.secret = bytes(value)

1833

2207

1834

2208

del _interface

1835

2209

1836

2210

1837

2211

class ProxyClient(object):

1838

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

2212

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

1839

2213

self._pipe = child_pipe

1840

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

2214

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

1841

2215

if not self._pipe.recv():

1842

raise KeyError(fpr)

1843

2216

raise KeyError(key_id or fpr)

2217

1844

2218

def __getattribute__(self, name):

1845

2219

if name == '_pipe':

1846

2220

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

1849

2223

if data[0] == 'data':

1850

2224

return data[1]

1851

2225

if data[0] == 'function':

1852

2226

1853

2227

def func(*args, **kwargs):

1854

2228

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

1855

2229

return self._pipe.recv()[1]

1856

2230

1857

2231

return func

1858

2232

1859

2233

def __setattr__(self, name, value):

1860

2234

if name == '_pipe':

1861

2235

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

1864

2238

1865

2239

class ClientHandler(socketserver.BaseRequestHandler, object):

1866

2240

"""A class to handle client connections.

1867

2241

1868

2242

Instantiated once for each connection to handle it.

1869

2243

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

1870

2244

1871

2245

def handle(self):

1872

2246

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

1873

2247

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

1874

2248

str(self.client_address))

1875

2249

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

1876

2250

self.server.child_pipe.fileno())

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"))

2251

2252

session = gnutls.ClientSession(self.request)

2253

2254

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

2255

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

2256

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

2257

# "+DHE-DSS"))

1890

2258

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

1891

2259

priority = self.server.gnutls_priority

1892

2260

if priority is None:

1893

2261

priority = "NORMAL"

1894

gnutls.library.functions.gnutls_priority_set_direct(

1895

session._c_object, priority, None)

1896

2262

gnutls.priority_set_direct(session._c_object,

2263

priority.encode("utf-8"),

2264

None)

2265

1897

2266

# Start communication using the Mandos protocol

1898

2267

# Get protocol number

1899

2268

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

1904

2273

except (ValueError, IndexError, RuntimeError) as error:

1905

2274

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

1906

2275

return

1907

2276

1908

2277

# Start GnuTLS connection

1909

2278

try:

1910

2279

session.handshake()

1911

except gnutls.errors.GNUTLSError as error:

2280

except gnutls.Error as error:

1912

2281

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

1913

2282

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

1914

2283

# established. Just abandon the request.

1915

2284

return

1916

2285

logger.debug("Handshake succeeded")

1917

2286

1918

2287

approval_required = False

1919

2288

try:

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,

2289

if gnutls.has_rawpk:

2290

fpr = ""

2291

try:

2292

key_id = self.key_id(

2293

self.peer_certificate(session))

2294

except (TypeError, gnutls.Error) as error:

2295

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

2296

return

2297

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

2298

2299

else:

2300

key_id = ""

2301

try:

2302

fpr = self.fingerprint(

2303

self.peer_certificate(session))

2304

except (TypeError, gnutls.Error) as error:

2305

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

2306

return

2307

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

2308

2309

try:

2310

client = ProxyClient(child_pipe, key_id, fpr,

1931

2311

self.client_address)

1932

2312

except KeyError:

1933

2313

return

1934

2314

1935

2315

if client.approval_delay:

1936

2316

delay = client.approval_delay

1937

2317

client.approvals_pending += 1

1938

2318

approval_required = True

1939

2319

1940

2320

while True:

1941

2321

if not client.enabled:

1942

2322

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

1945

2325

# Emit D-Bus signal

1946

2326

client.Rejected("Disabled")

1947

2327

return

1948

2328

1949

2329

if client.approved or not client.approval_delay:

1950

#We are approved or approval is disabled

2330

# We are approved or approval is disabled

1951

2331

break

1952

2332

elif client.approved is None:

1953

2333

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

1964

2344

# Emit D-Bus signal

1965

2345

client.Rejected("Denied")

1966

2346

return

1967

1968

#wait until timeout or approved

2347

2348

# wait until timeout or approved

1969

2349

time = datetime.datetime.now()

1970

2350

client.changedstate.acquire()

1971

2351

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

1984

2364

break

1985

2365

else:

1986

2366

delay -= time2 - time

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

2367

2368

try:

2369

session.send(client.secret)

2370

except gnutls.Error as error:

2371

logger.warning("gnutls send failed",

2372

exc_info=error)

2373

return

2374

2001

2375

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

2002

2376

# bump the timeout using extended_timeout

2003

2377

client.bump_timeout(client.extended_timeout)

2004

2378

if self.server.use_dbus:

2005

2379

# Emit D-Bus signal

2006

2380

client.GotSecret()

2007

2381

2008

2382

finally:

2009

2383

if approval_required:

2010

2384

client.approvals_pending -= 1

2011

2385

try:

2012

2386

session.bye()

2013

except gnutls.errors.GNUTLSError as error:

2387

except gnutls.Error as error:

2014

2388

logger.warning("GnuTLS bye failed",

2015

2389

exc_info=error)

2016

2390

2017

2391

@staticmethod

2018

2392

def peer_certificate(session):

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

2393

"Return the peer's certificate as a bytestring"

2394

try:

2395

cert_type = gnutls.certificate_type_get2(session._c_object,

2396

gnutls.CTYPE_PEERS)

2397

except AttributeError:

2398

cert_type = gnutls.certificate_type_get(session._c_object)

2399

if gnutls.has_rawpk:

2400

valid_cert_types = frozenset((gnutls.CRT_RAWPK,))

2401

else:

2402

valid_cert_types = frozenset((gnutls.CRT_OPENPGP,))

2403

# If not a valid certificate type...

2404

if cert_type not in valid_cert_types:

2405

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

2406

valid_cert_types)

2407

# ...return invalid data

2408

return b""

2026

2409

list_size = ctypes.c_uint(1)

2027

cert_list = (gnutls.library.functions

2028

.gnutls_certificate_get_peers

2410

cert_list = (gnutls.certificate_get_peers

2029

2411

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

2030

2412

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

2031

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

2032

" certificate")

2413

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

2033

2414

if list_size.value == 0:

2034

2415

return None

2035

2416

cert = cert_list[0]

2036

2417

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

2037

2418

2419

@staticmethod

2420

def key_id(certificate):

2421

"Convert a certificate bytestring to a hexdigit key ID"

2422

# New GnuTLS "datum" with the public key

2423

datum = gnutls.datum_t(

2424

ctypes.cast(ctypes.c_char_p(certificate),

2425

ctypes.POINTER(ctypes.c_ubyte)),

2426

ctypes.c_uint(len(certificate)))

2427

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

2428

# New empty GnuTLS certificate

2429

pubkey = gnutls.pubkey_t()

2430

gnutls.pubkey_init(ctypes.byref(pubkey))

2431

# Import the raw public key into the certificate

2432

gnutls.pubkey_import(pubkey,

2433

ctypes.byref(datum),

2434

gnutls.X509_FMT_DER)

2435

# New buffer for the key ID

2436

buf = ctypes.create_string_buffer(32)

2437

buf_len = ctypes.c_size_t(len(buf))

2438

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

2439

gnutls.pubkey_get_key_id(pubkey,

2440

gnutls.KEYID_USE_SHA256,

2441

ctypes.cast(ctypes.byref(buf),

2442

ctypes.POINTER(ctypes.c_ubyte)),

2443

ctypes.byref(buf_len))

2444

# Deinit the certificate

2445

gnutls.pubkey_deinit(pubkey)

2446

2447

# Convert the buffer to a Python bytestring

2448

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

2449

# Convert the bytestring to hexadecimal notation

2450

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

2451

return hex_key_id

2452

2038

2453

@staticmethod

2039

2454

def fingerprint(openpgp):

2040

2455

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

2041

2456

# New GnuTLS "datum" with the OpenPGP public key

2042

datum = gnutls.library.types.gnutls_datum_t(

2457

datum = gnutls.datum_t(

2043

2458

ctypes.cast(ctypes.c_char_p(openpgp),

2044

2459

ctypes.POINTER(ctypes.c_ubyte)),

2045

2460

ctypes.c_uint(len(openpgp)))

2046

2461

# New empty GnuTLS certificate

2047

crt = gnutls.library.types.gnutls_openpgp_crt_t()

2048

gnutls.library.functions.gnutls_openpgp_crt_init(

2049

ctypes.byref(crt))

2462

crt = gnutls.openpgp_crt_t()

2463

gnutls.openpgp_crt_init(ctypes.byref(crt))

2050

2464

# Import the OpenPGP public key into the certificate

2051

gnutls.library.functions.gnutls_openpgp_crt_import(

2052

crt, ctypes.byref(datum),

2053

gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)

2465

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

2466

gnutls.OPENPGP_FMT_RAW)

2054

2467

# Verify the self signature in the key

2055

2468

crtverify = ctypes.c_uint()

2056

gnutls.library.functions.gnutls_openpgp_crt_verify_self(

2057

crt, 0, ctypes.byref(crtverify))

2469

gnutls.openpgp_crt_verify_self(crt, 0,

2470

ctypes.byref(crtverify))

2058

2471

if crtverify.value != 0:

2059

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2060

raise gnutls.errors.CertificateSecurityError(

2061

"Verify failed")

2472

gnutls.openpgp_crt_deinit(crt)

2473

raise gnutls.CertificateSecurityError(code

2474

=crtverify.value)

2062

2475

# New buffer for the fingerprint

2063

2476

buf = ctypes.create_string_buffer(20)

2064

2477

buf_len = ctypes.c_size_t()

2065

2478

# Get the fingerprint from the certificate into the buffer

2066

gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint(

2067

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

2479

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

2480

ctypes.byref(buf_len))

2068

2481

# Deinit the certificate

2069

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

2482

gnutls.openpgp_crt_deinit(crt)

2070

2483

# Convert the buffer to a Python bytestring

2071

2484

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

2072

2485

# Convert the bytestring to hexadecimal notation

2076

2489

2077

2490

class MultiprocessingMixIn(object):

2078

2491

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

2079

2492

2080

2493

def sub_process_main(self, request, address):

2081

2494

try:

2082

2495

self.finish_request(request, address)

2083

2496

except Exception:

2084

2497

self.handle_error(request, address)

2085

2498

self.close_request(request)

2086

2499

2087

2500

def process_request(self, request, address):

2088

2501

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

2089

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

2090

args = (request, address))

2502

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

2503

args=(request, address))

2091

2504

proc.start()

2092

2505

return proc

2093

2506

2094

2507

2095

2508

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

2096

2509

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

2097

2510

2098

2511

def process_request(self, request, client_address):

2099

2512

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

2100

2513

2101

2514

This function creates a new pipe in self.pipe

2102

2515

"""

2103

2516

parent_pipe, self.child_pipe = multiprocessing.Pipe()

2104

2517

2105

2518

proc = MultiprocessingMixIn.process_request(self, request,

2106

2519

client_address)

2107

2520

self.child_pipe.close()

2108

2521

self.add_pipe(parent_pipe, proc)

2109

2522

2110

2523

def add_pipe(self, parent_pipe, proc):

2111

2524

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

2112

2525

raise NotImplementedError()

2115

2528

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

2116

2529

socketserver.TCPServer, object):

2117

2530

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

2118

2531

2119

2532

Attributes:

2120

2533

enabled: Boolean; whether this server is activated yet

2121

2534

interface: None or a network interface name (string)

2122

2535

use_ipv6: Boolean; to use IPv6 or not

2123

2536

"""

2124

2537

2125

2538

def __init__(self, server_address, RequestHandlerClass,

2126

2539

interface=None,

2127

2540

use_ipv6=True,

2137

2550

self.socketfd = socketfd

2138

2551

# Save the original socket.socket() function

2139

2552

self.socket_socket = socket.socket

2553

2140

2554

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

2141

#

2555

#

2142

2556

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

2143

2557

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

2144

2558

# patching socket.socket.)

2145

#

2559

#

2146

2560

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

2147

2561

@functools.wraps(socket.socket)

2148

2562

def socket_wrapper(*args, **kwargs):

2160

2574

# socket_wrapper(), if socketfd was set.

2161

2575

socketserver.TCPServer.__init__(self, server_address,

2162

2576

RequestHandlerClass)

2163

2577

2164

2578

def server_bind(self):

2165

2579

"""This overrides the normal server_bind() function

2166

2580

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

2167

2581

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

2582

global SO_BINDTODEVICE

2168

2583

if self.interface is not None:

2169

2584

if SO_BINDTODEVICE is None:

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

2585

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

2586

# common enough.

2587

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

2588

SO_BINDTODEVICE = 25

2589

try:

2590

self.socket.setsockopt(

2591

socket.SOL_SOCKET, SO_BINDTODEVICE,

2592

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

2593

except socket.error as error:

2594

if error.errno == errno.EPERM:

2595

logger.error("No permission to bind to"

2596

" interface %s", self.interface)

2597

elif error.errno == errno.ENOPROTOOPT:

2598

logger.error("SO_BINDTODEVICE not available;"

2599

" cannot bind to interface %s",

2600

self.interface)

2601

elif error.errno == errno.ENODEV:

2602

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

2603

" cannot bind", self.interface)

2604

else:

2605

raise

2191

2606

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

2192

2607

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

2608

if self.server_address[1]:

2609

self.allow_reuse_address = True

2193

2610

if not self.server_address[0]:

2194

2611

if self.address_family == socket.AF_INET6:

2195

any_address = "::" # in6addr_any

2612

any_address = "::" # in6addr_any

2196

2613

else:

2197

any_address = "0.0.0.0" # INADDR_ANY

2614

any_address = "0.0.0.0" # INADDR_ANY

2198

2615

self.server_address = (any_address,

2199

2616

self.server_address[1])

2200

2617

elif not self.server_address[1]:

2210

2627

2211

2628

class MandosServer(IPv6_TCPServer):

2212

2629

"""Mandos server.

2213

2630

2214

2631

Attributes:

2215

2632

clients: set of Client objects

2216

2633

gnutls_priority GnuTLS priority string

2217

2634

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

2218

2219

Assumes a gobject.MainLoop event loop.

2635

2636

Assumes a GLib.MainLoop event loop.

2220

2637

"""

2221

2638

2222

2639

def __init__(self, server_address, RequestHandlerClass,

2223

2640

interface=None,

2224

2641

use_ipv6=True,

2234

2651

self.gnutls_priority = gnutls_priority

2235

2652

IPv6_TCPServer.__init__(self, server_address,

2236

2653

RequestHandlerClass,

2237

interface = interface,

2238

use_ipv6 = use_ipv6,

2239

socketfd = socketfd)

2240

2654

interface=interface,

2655

use_ipv6=use_ipv6,

2656

socketfd=socketfd)

2657

2241

2658

def server_activate(self):

2242

2659

if self.enabled:

2243

2660

return socketserver.TCPServer.server_activate(self)

2244

2661

2245

2662

def enable(self):

2246

2663

self.enabled = True

2247

2664

2248

2665

def add_pipe(self, parent_pipe, proc):

2249

2666

# Call "handle_ipc" for both data and EOF events

2250

gobject.io_add_watch(

2667

GLib.io_add_watch(

2251

2668

parent_pipe.fileno(),

2252

gobject.IO_IN | gobject.IO_HUP,

2669

GLib.IO_IN | GLib.IO_HUP,

2253

2670

functools.partial(self.handle_ipc,

2254

parent_pipe = parent_pipe,

2255

proc = proc))

2256

2671

parent_pipe=parent_pipe,

2672

proc=proc))

2673

2257

2674

def handle_ipc(self, source, condition,

2258

2675

parent_pipe=None,

2259

proc = None,

2676

proc=None,

2260

2677

client_object=None):

2261

2678

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

2262

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

2679

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

2263

2680

# Wait for other process to exit

2264

2681

proc.join()

2265

2682

return False

2266

2683

2267

2684

# Read a request from the child

2268

2685

request = parent_pipe.recv()

2269

2686

command = request[0]

2270

2687

2271

2688

if command == 'init':

2272

fpr = request[1]

2273

address = request[2]

2274

2275

for c in self.clients.itervalues():

2276

if c.fingerprint == fpr:

2689

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

2690

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

2691

address = request[3]

2692

2693

for c in self.clients.values():

2694

if key_id == "E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855":

2695

continue

2696

if key_id and c.key_id == key_id:

2697

client = c

2698

break

2699

if fpr and c.fingerprint == fpr:

2277

2700

client = c

2278

2701

break

2279

2702

else:

2280

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

2281

"dress: %s", fpr, address)

2703

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

2704

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

2282

2705

if self.use_dbus:

2283

2706

# Emit D-Bus signal

2284

mandos_dbus_service.ClientNotFound(fpr,

2707

mandos_dbus_service.ClientNotFound(key_id or fpr,

2285

2708

address[0])

2286

2709

parent_pipe.send(False)

2287

2710

return False

2288

2289

gobject.io_add_watch(

2711

2712

GLib.io_add_watch(

2290

2713

parent_pipe.fileno(),

2291

gobject.IO_IN | gobject.IO_HUP,

2714

GLib.IO_IN | GLib.IO_HUP,

2292

2715

functools.partial(self.handle_ipc,

2293

parent_pipe = parent_pipe,

2294

proc = proc,

2295

client_object = client))

2716

parent_pipe=parent_pipe,

2717

proc=proc,

2718

client_object=client))

2296

2719

parent_pipe.send(True)

2297

2720

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

2298

2721

# same fileno

2301

2724

funcname = request[1]

2302

2725

args = request[2]

2303

2726

kwargs = request[3]

2304

2727

2305

2728

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

2306

2729

funcname)(*args,

2307

2730

**kwargs)))

2308

2731

2309

2732

if command == 'getattr':

2310

2733

attrname = request[1]

2311

2734

if isinstance(client_object.__getattribute__(attrname),

2314

2737

else:

2315

2738

parent_pipe.send((

2316

2739

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

2317

2740

2318

2741

if command == 'setattr':

2319

2742

attrname = request[1]

2320

2743

value = request[2]

2321

2744

setattr(client_object, attrname, value)

2322

2745

2323

2746

return True

2324

2747

2325

2748

2326

2749

def rfc3339_duration_to_delta(duration):

2327

2750

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

2328

2751

2329

2752

>>> rfc3339_duration_to_delta("P7D")

2330

2753

datetime.timedelta(7)

2331

2754

>>> rfc3339_duration_to_delta("PT60S")

2341

2764

>>> rfc3339_duration_to_delta("P1DT3M20S")

2342

2765

datetime.timedelta(1, 200)

2343

2766

"""

2344

2767

2345

2768

# Parsing an RFC 3339 duration with regular expressions is not

2346

2769

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

2347

2770

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

2348

2771

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

2349

2772

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

2350

2773

# avoid excessive use of external libraries.

2351

2774

2352

2775

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

2353

2776

Token = collections.namedtuple("Token", (

2354

2777

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

2387

2810

frozenset((token_year, token_month,

2388

2811

token_day, token_time,

2389

2812

token_week)))

2390

# Define starting values

2391

value = datetime.timedelta() # Value so far

2813

# Define starting values:

2814

# Value so far

2815

value = datetime.timedelta()

2392

2816

found_token = None

2393

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

2394

s = duration # String left to parse

2817

# Following valid tokens

2818

followers = frozenset((token_duration, ))

2819

# String left to parse

2820

s = duration

2395

2821

# Loop until end token is found

2396

2822

while found_token is not token_end:

2397

2823

# Search for any currently valid tokens

2421

2847

2422

2848

def string_to_delta(interval):

2423

2849

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

2424

2850

2425

2851

>>> string_to_delta('7d')

2426

2852

datetime.timedelta(7)

2427

2853

>>> string_to_delta('60s')

2435

2861

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

2436

2862

datetime.timedelta(0, 330)

2437

2863

"""

2438

2864

2439

2865

try:

2440

2866

return rfc3339_duration_to_delta(interval)

2441

2867

except ValueError:

2442

2868

pass

2443

2869

2444

2870

timevalue = datetime.timedelta(0)

2445

2871

for s in interval.split():

2446

2872

try:

2464

2890

return timevalue

2465

2891

2466

2892

2467

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

2893

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

2468

2894

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

2469

2895

2470

2896

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

2471

2897

if os.fork():

2472

2898

sys.exit()

2490

2916

2491

2917

2492

2918

def main():

2493

2919

2494

2920

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

2495

2921

# Parsing of options, both command line and config file

2496

2922

2497

2923

parser = argparse.ArgumentParser()

2498

2924

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

2499

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

2925

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

2500

2926

help="show version number and exit")

2501

2927

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

2502

2928

help="Bind to interface IF")

2538

2964

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

2539

2965

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

2540

2966

default=None)

2541

2967

2542

2968

options = parser.parse_args()

2543

2969

2544

2970

if options.check:

2545

2971

import doctest

2546

2972

fail_count, test_count = doctest.testmod()

2547

2973

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

2548

2974

2549

2975

# Default values for config file for server-global settings

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

2976

if gnutls.has_rawpk:

2977

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

2978

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

2979

else:

2980

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

2981

":+SIGN-DSA-SHA256")

2982

server_defaults = {"interface": "",

2983

"address": "",

2984

"port": "",

2985

"debug": "False",

2986

"priority": priority,

2987

"servicename": "Mandos",

2988

"use_dbus": "True",

2989

"use_ipv6": "True",

2990

"debuglevel": "",

2991

"restore": "True",

2992

"socket": "",

2993

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

2994

"foreground": "False",

2995

"zeroconf": "True",

2996

}

2997

del priority

2998

2568

2999

# Parse config file for server-global settings

2569

3000

server_config = configparser.SafeConfigParser(server_defaults)

2570

3001

del server_defaults

2572

3003

# Convert the SafeConfigParser object to a dict

2573

3004

server_settings = server_config.defaults()

2574

3005

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

2575

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

3006

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

3007

"foreground", "zeroconf"):

2576

3008

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

2577

3009

option)

2578

3010

if server_settings["port"]:

2588

3020

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

2589

3021

["socket"])

2590

3022

del server_config

2591

3023

2592

3024

# Override the settings from the config file with command line

2593

3025

# options, if set.

2594

3026

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

2612

3044

if server_settings["debug"]:

2613

3045

server_settings["foreground"] = True

2614

3046

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

2615

3047

2616

3048

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

2617

3049

2618

3050

if (not server_settings["zeroconf"]

2619

3051

and not (server_settings["port"]

2620

3052

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

2621

3053

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

2622

3054

2623

3055

# For convenience

2624

3056

debug = server_settings["debug"]

2625

3057

debuglevel = server_settings["debuglevel"]

2629

3061

stored_state_file)

2630

3062

foreground = server_settings["foreground"]

2631

3063

zeroconf = server_settings["zeroconf"]

2632

3064

2633

3065

if debug:

2634

3066

initlogger(debug, logging.DEBUG)

2635

3067

else:

2638

3070

else:

2639

3071

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

2640

3072

initlogger(debug, level)

2641

3073

2642

3074

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

2643

3075

syslogger.setFormatter(

2644

3076

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

2645

3077

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

2646

3078

server_settings["servicename"])))

2647

3079

2648

3080

# Parse config file with clients

2649

3081

client_config = configparser.SafeConfigParser(Client

2650

3082

.client_defaults)

2651

3083

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

2652

3084

"clients.conf"))

2653

3085

2654

3086

global mandos_dbus_service

2655

3087

mandos_dbus_service = None

2656

3088

2657

3089

socketfd = None

2658

3090

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

2659

3091

socketfd = server_settings["socket"]

2675

3107

except IOError as e:

2676

3108

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

2677

3109

exc_info=e)

2678

2679

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

3110

3111

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

3112

("mandos", "mandos"),

3113

("nobody", "nogroup")):

2680

3114

try:

2681

3115

uid = pwd.getpwnam(name).pw_uid

2682

gid = pwd.getpwnam(name).pw_gid

3116

gid = pwd.getpwnam(group).pw_gid

2683

3117

break

2684

3118

except KeyError:

2685

3119

continue

2689

3123

try:

2690

3124

os.setgid(gid)

2691

3125

os.setuid(uid)

3126

if debug:

3127

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

3128

gid))

2692

3129

except OSError as error:

3130

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

3131

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

2693

3132

if error.errno != errno.EPERM:

2694

3133

raise

2695

3134

2696

3135

if debug:

2697

3136

# Enable all possible GnuTLS debugging

2698

3137

2699

3138

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

2700

3139

# - GnuTLS manual

2701

gnutls.library.functions.gnutls_global_set_log_level(11)

2702

2703

@gnutls.library.types.gnutls_log_func

3140

gnutls.global_set_log_level(11)

3141

3142

@gnutls.log_func

2704

3143

def debug_gnutls(level, string):

2705

3144

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

2706

2707

gnutls.library.functions.gnutls_global_set_log_function(

2708

debug_gnutls)

2709

3145

3146

gnutls.global_set_log_function(debug_gnutls)

3147

2710

3148

# Redirect stdin so all checkers get /dev/null

2711

3149

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

2712

3150

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

2713

3151

if null > 2:

2714

3152

os.close(null)

2715

3153

2716

3154

# Need to fork before connecting to D-Bus

2717

3155

if not foreground:

2718

3156

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

2719

3157

daemon()

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

3158

3159

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

3160

# to inform GLib that threads will be used.

3161

GLib.threads_init()

3162

2725

3163

global main_loop

2726

3164

# From the Avahi example code

2727

3165

DBusGMainLoop(set_as_default=True)

2728

main_loop = gobject.MainLoop()

3166

main_loop = GLib.MainLoop()

2729

3167

bus = dbus.SystemBus()

2730

3168

# End of Avahi example code

2731

3169

if use_dbus:

2744

3182

if zeroconf:

2745

3183

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2746

3184

service = AvahiServiceToSyslog(

2747

name = server_settings["servicename"],

2748

servicetype = "_mandos._tcp",

2749

protocol = protocol,

2750

bus = bus)

3185

name=server_settings["servicename"],

3186

servicetype="_mandos._tcp",

3187

protocol=protocol,

3188

bus=bus)

2751

3189

if server_settings["interface"]:

2752

3190

service.interface = if_nametoindex(

2753

3191

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

2754

3192

2755

3193

global multiprocessing_manager

2756

3194

multiprocessing_manager = multiprocessing.Manager()

2757

3195

2758

3196

client_class = Client

2759

3197

if use_dbus:

2760

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

2761

3198

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

3199

2762

3200

client_settings = Client.config_parser(client_config)

2763

3201

old_client_settings = {}

2764

3202

clients_data = {}

2765

3203

2766

3204

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

2767

3205

global wnull

2768

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

3206

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

2769

3207

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

2770

3208

# mode

2771

3209

if debug or not foreground:

2772

3210

wnull.close()

2773

3211

2774

3212

# Get client data and settings from last running state.

2775

3213

if server_settings["restore"]:

2776

3214

try:

2777

3215

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

2778

clients_data, old_client_settings = pickle.load(

2779

stored_state)

3216

if sys.version_info.major == 2:

3217

clients_data, old_client_settings = pickle.load(

3218

stored_state)

3219

else:

3220

bytes_clients_data, bytes_old_client_settings = (

3221

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

3222

# Fix bytes to strings

3223

# clients_data

3224

# .keys()

3225

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

3226

if isinstance(key, bytes)

3227

else key): value

3228

for key, value in

3229

bytes_clients_data.items()}

3230

del bytes_clients_data

3231

for key in clients_data:

3232

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

3233

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

3234

for k, v in

3235

clients_data[key].items()}

3236

clients_data[key] = value

3237

# .client_structure

3238

value["client_structure"] = [

3239

(s.decode("utf-8")

3240

if isinstance(s, bytes)

3241

else s) for s in

3242

value["client_structure"]]

3243

# .name & .host

3244

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

3245

if isinstance(value[k], bytes):

3246

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

3247

if not value.has_key("key_id"):

3248

value["key_id"] = ""

3249

elif not value.has_key("fingerprint"):

3250

value["fingerprint"] = ""

3251

# old_client_settings

3252

# .keys()

3253

old_client_settings = {

3254

(key.decode("utf-8")

3255

if isinstance(key, bytes)

3256

else key): value

3257

for key, value in

3258

bytes_old_client_settings.items()}

3259

del bytes_old_client_settings

3260

# .host

3261

for value in old_client_settings.values():

3262

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

3263

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

3264

.decode("utf-8"))

2780

3265

os.remove(stored_state_path)

2781

3266

except IOError as e:

2782

3267

if e.errno == errno.ENOENT:

2790

3275

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

2791

3276

"EOFError:",

2792

3277

exc_info=e)

2793

3278

2794

3279

with PGPEngine() as pgp:

2795

3280

for client_name, client in clients_data.items():

2796

3281

# Skip removed clients

2797

3282

if client_name not in client_settings:

2798

3283

continue

2799

3284

2800

3285

# Decide which value to use after restoring saved state.

2801

3286

# We have three different values: Old config file,

2802

3287

# new config file, and saved state.

2813

3298

client[name] = value

2814

3299

except KeyError:

2815

3300

pass

2816

3301

2817

3302

# Clients who has passed its expire date can still be

2818

3303

# enabled if its last checker was successful. A Client

2819

3304

# whose checker succeeded before we stored its state is

2852

3337

client_name))

2853

3338

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

2854

3339

["secret"])

2855

3340

2856

3341

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

2857

3342

for client_name in (set(old_client_settings)

2858

3343

- set(client_settings)):

2860

3345

for client_name in (set(client_settings)

2861

3346

- set(old_client_settings)):

2862

3347

clients_data[client_name] = client_settings[client_name]

2863

3348

2864

3349

# Create all client objects

2865

3350

for client_name, client in clients_data.items():

2866

3351

tcp_server.clients[client_name] = client_class(

2867

name = client_name,

2868

settings = client,

2869

server_settings = server_settings)

2870

3352

name=client_name,

3353

settings=client,

3354

server_settings=server_settings)

3355

2871

3356

if not tcp_server.clients:

2872

3357

logger.warning("No clients defined")

2873

3358

2874

3359

if not foreground:

2875

3360

if pidfile is not None:

2876

3361

pid = os.getpid()

2882

3367

pidfilename, pid)

2883

3368

del pidfile

2884

3369

del pidfilename

2885

2886

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

2887

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

2888

3370

3371

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

3372

GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,

3373

lambda: main_loop.quit() and False)

3374

2889

3375

if use_dbus:

2890

3376

2891

3377

@alternate_dbus_interfaces(

2892

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

3378

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

2893

3379

class MandosDBusService(DBusObjectWithObjectManager):

2894

3380

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

2895

3381

2896

3382

def __init__(self):

2897

3383

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

2898

3384

2899

3385

_interface = "se.recompile.Mandos"

2900

3386

2901

3387

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

2902

3388

def ClientAdded(self, objpath):

2903

3389

"D-Bus signal"

2904

3390

pass

2905

3391

2906

3392

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

2907

def ClientNotFound(self, fingerprint, address):

3393

def ClientNotFound(self, key_id, address):

2908

3394

"D-Bus signal"

2909

3395

pass

2910

3396

2911

3397

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

2912

3398

"true"})

2913

3399

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

2914

3400

def ClientRemoved(self, objpath, name):

2915

3401

"D-Bus signal"

2916

3402

pass

2917

3403

2918

3404

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

2919

3405

"true"})

2920

3406

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

2921

3407

def GetAllClients(self):

2922

3408

"D-Bus method"

2923

3409

return dbus.Array(c.dbus_object_path for c in

2924

tcp_server.clients.itervalues())

2925

3410

tcp_server.clients.values())

3411

2926

3412

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

2927

3413

"true"})

2928

3414

@dbus.service.method(_interface,

2930

3416

def GetAllClientsWithProperties(self):

2931

3417

"D-Bus method"

2932

3418

return dbus.Dictionary(

2933

{ c.dbus_object_path: c.GetAll(

3419

{c.dbus_object_path: c.GetAll(

2934

3420

"se.recompile.Mandos.Client")

2935

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

3421

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

2936

3422

signature="oa{sv}")

2937

3423

2938

3424

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

2939

3425

def RemoveClient(self, object_path):

2940

3426

"D-Bus method"

2941

for c in tcp_server.clients.itervalues():

3427

for c in tcp_server.clients.values():

2942

3428

if c.dbus_object_path == object_path:

2943

3429

del tcp_server.clients[c.name]

2944

3430

c.remove_from_connection()

2948

3434

self.client_removed_signal(c)

2949

3435

return

2950

3436

raise KeyError(object_path)

2951

3437

2952

3438

del _interface

2953

3439

2954

3440

@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,

2955

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

3441

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

2956

3442

def GetManagedObjects(self):

2957

3443

"""D-Bus method"""

2958

3444

return dbus.Dictionary(

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

3445

{client.dbus_object_path:

3446

dbus.Dictionary(

3447

{interface: client.GetAll(interface)

3448

for interface in

3449

client._get_all_interface_names()})

3450

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

3451

2966

3452

def client_added_signal(self, client):

2967

3453

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

2968

3454

if use_dbus:

2970

3456

self.InterfacesAdded(

2971

3457

client.dbus_object_path,

2972

3458

dbus.Dictionary(

2973

{ interface: client.GetAll(interface)

2974

for interface in

2975

client._get_all_interface_names()}))

3459

{interface: client.GetAll(interface)

3460

for interface in

3461

client._get_all_interface_names()}))

2976

3462

# Old signal

2977

3463

self.ClientAdded(client.dbus_object_path)

2978

3464

2979

3465

def client_removed_signal(self, client):

2980

3466

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

2981

3467

if use_dbus:

2986

3472

# Old signal

2987

3473

self.ClientRemoved(client.dbus_object_path,

2988

3474

client.name)

2989

3475

2990

3476

mandos_dbus_service = MandosDBusService()

2991

3477

3478

# Save modules to variables to exempt the modules from being

3479

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

3480

mp = multiprocessing

3481

wn = wnull

3482

2992

3483

def cleanup():

2993

3484

"Cleanup function; run on exit"

2994

3485

if zeroconf:

2995

3486

service.cleanup()

2996

2997

multiprocessing.active_children()

2998

wnull.close()

3487

3488

mp.active_children()

3489

wn.close()

2999

3490

if not (tcp_server.clients or client_settings):

3000

3491

return

3001

3492

3002

3493

# Store client before exiting. Secrets are encrypted with key

3003

3494

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

3004

3495

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

3005

3496

clients = {}

3006

3497

with PGPEngine() as pgp:

3007

for client in tcp_server.clients.itervalues():

3498

for client in tcp_server.clients.values():

3008

3499

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

3009

3500

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

3010

3501

key)

3011

3502

client_dict = {}

3012

3503

3013

3504

# A list of attributes that can not be pickled

3014

3505

# + secret.

3015

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

3016

"checker", "server_settings" }

3506

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

3507

"checker", "server_settings"}

3017

3508

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

3018

3509

.Object):

3019

3510

exclude.add(name)

3020

3511

3021

3512

client_dict["encrypted_secret"] = (client

3022

3513

.encrypted_secret)

3023

3514

for attr in client.client_structure:

3024

3515

if attr not in exclude:

3025

3516

client_dict[attr] = getattr(client, attr)

3026

3517

3027

3518

clients[client.name] = client_dict

3028

3519

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

3029

3520

3030

3521

try:

3031

3522

with tempfile.NamedTemporaryFile(

3032

3523

mode='wb',

3034

3525

prefix='clients-',

3035

3526

dir=os.path.dirname(stored_state_path),

3036

3527

delete=False) as stored_state:

3037

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

3528

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

3529

protocol=2)

3038

3530

tempname = stored_state.name

3039

3531

os.rename(tempname, stored_state_path)

3040

3532

except (IOError, OSError) as e:

3050

3542

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

3051

3543

exc_info=e)

3052

3544

raise

3053

3545

3054

3546

# Delete all clients, and settings from config

3055

3547

while tcp_server.clients:

3056

3548

name, client = tcp_server.clients.popitem()

3059

3551

# Don't signal the disabling

3060

3552

client.disable(quiet=True)

3061

3553

# Emit D-Bus signal for removal

3062

mandos_dbus_service.client_removed_signal(client)

3554

if use_dbus:

3555

mandos_dbus_service.client_removed_signal(client)

3063

3556

client_settings.clear()

3064

3557

3065

3558

atexit.register(cleanup)

3066

3067

for client in tcp_server.clients.itervalues():

3559

3560

for client in tcp_server.clients.values():

3068

3561

if use_dbus:

3069

3562

# Emit D-Bus signal for adding

3070

3563

mandos_dbus_service.client_added_signal(client)

3071

3564

# Need to initiate checking of clients

3072

3565

if client.enabled:

3073

3566

client.init_checker()

3074

3567

3075

3568

tcp_server.enable()

3076

3569

tcp_server.server_activate()

3077

3570

3078

3571

# Find out what port we got

3079

3572

if zeroconf:

3080

3573

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

3085

3578

else: # IPv4

3086

3579

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

3087

3580

*tcp_server.socket.getsockname())

3088

3089

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

3090

3581

3582

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

3583

3091

3584

try:

3092

3585

if zeroconf:

3093

3586

# From the Avahi example code

3098

3591

cleanup()

3099

3592

sys.exit(1)

3100

3593

# End of Avahi example code

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

3594

3595

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

3596

lambda *args, **kwargs:

3597

(tcp_server.handle_request

3598

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

3599

3107

3600

logger.debug("Starting main loop")

3108

3601

main_loop.run()

3109

3602

except AvahiError as error: