/mandos/trunk : revision 549

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#!/usr/bin/python

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

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

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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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import SocketServer as socketserver

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import socket

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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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import ConfigParser as configparser

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import sys

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import re

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import os

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import signal

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import subprocess

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import atexit

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import stat

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import logging

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import logging.handlers

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import pwd

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import contextlib

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import struct

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import fcntl

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import functools

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import cPickle as pickle

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import multiprocessing

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import types

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import binascii

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import tempfile

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import dbus

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import dbus.service

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import gobject

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import avahi

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from dbus.mainloop.glib import DBusGMainLoop

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import ctypes

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import ctypes.util

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import xml.dom.minidom

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import inspect

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import GnuPGInterface

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try:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except AttributeError:

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try:

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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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version = "1.5.0"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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address = str("/dev/log")))

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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

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.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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with contextlib.closing(socket.socket()) as s:

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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struct.pack(str("16s16x"),

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interface))

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interface_index = struct.unpack(str("I"),

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ifreq[16:20])[0]

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return interface_index

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

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"""init logger and add loglevel"""

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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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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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"""Exception if encryption/decryption fails"""

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pass

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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.gnupg = GnuPGInterface.GnuPG()

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

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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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self.gnupg.options.extra_args.extend(['--force-mdc',

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'--quiet',

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'--no-use-agent'])

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def __enter__(self):

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return self

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

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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

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topdown = False):

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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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os.rmdir(os.path.join(root, dirname))

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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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return b"mandos" + binascii.hexlify(password)

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def encrypt(self, data, password):

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self.gnupg.passphrase = self.password_encode(password)

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with open(os.devnull) as devnull:

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try:

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proc = self.gnupg.run(['--symmetric'],

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create_fhs=['stdin', 'stdout'],

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attach_fhs={'stderr': devnull})

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with contextlib.closing(proc.handles['stdin']) as f:

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f.write(data)

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with contextlib.closing(proc.handles['stdout']) as f:

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ciphertext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return ciphertext

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def decrypt(self, data, password):

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self.gnupg.passphrase = self.password_encode(password)

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with open(os.devnull) as devnull:

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try:

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proc = self.gnupg.run(['--decrypt'],

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create_fhs=['stdin', 'stdout'],

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attach_fhs={'stderr': devnull})

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with contextlib.closing(proc.handles['stdin'] ) as f:

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f.write(data)

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with contextlib.closing(proc.handles['stdout']) as f:

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decrypted_plaintext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return decrypted_plaintext

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class AvahiError(Exception):

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

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self.value = value

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super(AvahiError, self).__init__(value, *args, **kwargs)

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def __unicode__(self):

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return unicode(repr(self.value))

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class AvahiServiceError(AvahiError):

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pass

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class AvahiGroupError(AvahiError):

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pass

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class AvahiService(object):

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"""An Avahi (Zeroconf) service.

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Attributes:

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

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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type: string; Example: '_mandos._tcp'.

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See <http://www.dns-sd.org/ServiceTypes.html>

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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domain: string; Domain to publish on, default to .local if empty.

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host: string; Host to publish records for, default is localhost

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max_renames: integer; maximum number of renames

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rename_count: integer; counter so we only rename after collisions

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a sensible number of times

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group: D-Bus Entry Group

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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, interface = avahi.IF_UNSPEC, name = None,

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servicetype = None, port = None, TXT = None,

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domain = "", host = "", max_renames = 32768,

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protocol = avahi.PROTO_UNSPEC, bus = None):

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self.interface = interface

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self.name = name

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self.type = servicetype

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self.port = port

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self.TXT = TXT if TXT is not None else []

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self.domain = domain

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self.host = host

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self.rename_count = 0

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self.max_renames = max_renames

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self.protocol = protocol

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self.group = None # our entry group

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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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("No suitable Zeroconf service name found"

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" after %i retries, exiting.",

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self.rename_count)

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raise AvahiServiceError("Too many renames")

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self.name = unicode(self.server

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.GetAlternativeServiceName(self.name))

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logger.info("Changing Zeroconf service name to %r ...",

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self.name)

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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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logger.critical("DBusException: %s", error)

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self.cleanup()

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os._exit(1)

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self.rename_count += 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.remove()

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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if self.group is None:

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self.group = dbus.Interface(

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self.bus.get_object(avahi.DBUS_NAME,

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self.server.EntryGroupNew()),

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.entry_group_state_changed_match = (

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self.group.connect_to_signal(

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'StateChanged', self.entry_group_state_changed))

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logger.debug("Adding Zeroconf service '%s' of type '%s' ...",

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self.name, self.type)

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self.group.AddService(

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self.interface,

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self.protocol,

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dbus.UInt32(0), # flags

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self.name, self.type,

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self.domain, self.host,

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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if state == avahi.ENTRY_GROUP_ESTABLISHED:

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logger.debug("Zeroconf service established.")

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elif state == avahi.ENTRY_GROUP_COLLISION:

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logger.info("Zeroconf service name collision.")

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self.rename()

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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def cleanup(self):

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

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if self.group is not None:

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try:

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self.group.Free()

331

except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException):

333

pass

334

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"""

338

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

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bad_states = { avahi.SERVER_INVALID:

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"Zeroconf server invalid",

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avahi.SERVER_REGISTERING: None,

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avahi.SERVER_COLLISION:

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"Zeroconf server name collision",

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avahi.SERVER_FAILURE:

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"Zeroconf server failure" }

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if state in bad_states:

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if bad_states[state] is not None:

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if error is None:

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logger.error(bad_states[state])

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else:

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

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self.cleanup()

353

elif state == avahi.SERVER_RUNNING:

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self.add()

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else:

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if error is None:

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

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else:

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

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def activate(self):

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

362

if self.server is None:

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self.server = dbus.Interface(

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self.bus.get_object(avahi.DBUS_NAME,

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avahi.DBUS_PATH_SERVER,

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follow_name_owner_changes=True),

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avahi.DBUS_INTERFACE_SERVER)

368

self.server.connect_to_signal("StateChanged",

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self.server_state_changed)

370

self.server_state_changed(self.server.GetState())

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372

class AvahiServiceToSyslog(AvahiService):

373

def rename(self):

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

375

ret = AvahiService.rename(self)

376

syslogger.setFormatter(logging.Formatter

377

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

378

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

379

% self.name))

380

return ret

381

382

def timedelta_to_milliseconds(td):

383

"Convert a datetime.timedelta() to milliseconds"

384

return ((td.days * 24 * 60 * 60 * 1000)

385

+ (td.seconds * 1000)

386

+ (td.microseconds // 1000))

387

388

class Client(object):

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

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391

Attributes:

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

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

394

approval_duration: datetime.timedelta(); Duration of one approval

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

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to see if the client lives.

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'None' if no process is running.

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checker_callback_tag: a gobject event source tag, or None

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checker_command: string; External command which is run to check

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if client lives. %() expansions are done at

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

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

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checker_initiator_tag: a gobject event source tag, or None

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

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client_structure: Object describing what attributes a client has

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and is used for storing the client at exit

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current_checker_command: string; current running checker_command

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disable_initiator_tag: a gobject event source tag, or None

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enabled: bool()

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

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uniquely identify the client

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host: string; available for use by the checker command

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

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

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

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, or None.

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

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name: string; from the config file, used in log messages and

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D-Bus identifiers

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secret: bytestring; sent verbatim (over TLS) to client

423

timeout: datetime.timedelta(); How long from last_checked_ok

424

until this client is disabled

425

extended_timeout: extra long timeout when password has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

427

expires: datetime.datetime(); time (UTC) when a client will be

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disabled, or None

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"""

430

431

runtime_expansions = ("approval_delay", "approval_duration",

432

"created", "enabled", "fingerprint",

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"host", "interval", "last_checked_ok",

434

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

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client_defaults = { "timeout": "5m",

436

"extended_timeout": "15m",

437

"interval": "2m",

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"checker": "fping -q -- %%(host)s",

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"host": "",

440

"approval_delay": "0s",

441

"approval_duration": "1s",

442

"approved_by_default": "True",

443

"enabled": "True",

444

}

445

446

def timeout_milliseconds(self):

447

"Return the 'timeout' attribute in milliseconds"

448

return timedelta_to_milliseconds(self.timeout)

449

450

def extended_timeout_milliseconds(self):

451

"Return the 'extended_timeout' attribute in milliseconds"

452

return timedelta_to_milliseconds(self.extended_timeout)

453

454

def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

456

return timedelta_to_milliseconds(self.interval)

457

458

def approval_delay_milliseconds(self):

459

return timedelta_to_milliseconds(self.approval_delay)

460

461

@staticmethod

462

def config_parser(config):

463

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

464

{ client_name: {setting_name: value, ...}, ...}

465

with exceptions for any special settings as defined above.

466

NOTE: Must be a pure function. Must return the same result

467

value given the same arguments.

468

"""

469

settings = {}

470

for client_name in config.sections():

471

section = dict(config.items(client_name))

472

client = settings[client_name] = {}

473

474

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

475

# Reformat values from string types to Python types

476

client["approved_by_default"] = config.getboolean(

477

client_name, "approved_by_default")

478

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

479

"enabled")

480

481

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

482

.replace(" ", ""))

483

if "secret" in section:

484

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

485

elif "secfile" in section:

486

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

487

(section["secfile"])),

488

"rb") as secfile:

489

client["secret"] = secfile.read()

490

else:

491

raise TypeError("No secret or secfile for section %s"

492

% section)

493

client["timeout"] = string_to_delta(section["timeout"])

494

client["extended_timeout"] = string_to_delta(

495

section["extended_timeout"])

496

client["interval"] = string_to_delta(section["interval"])

497

client["approval_delay"] = string_to_delta(

498

section["approval_delay"])

499

client["approval_duration"] = string_to_delta(

500

section["approval_duration"])

501

client["checker_command"] = section["checker"]

502

client["last_approval_request"] = None

503

client["last_checked_ok"] = None

504

client["last_checker_status"] = None

505

506

return settings

507

508

509

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

510

"""Note: the 'checker' key in 'config' sets the

511

'checker_command' attribute and *not* the 'checker'

512

attribute."""

513

self.name = name

514

# adding all client settings

515

for setting, value in settings.iteritems():

516

setattr(self, setting, value)

517

518

if self.enabled:

519

if not hasattr(self, "last_enabled"):

520

self.last_enabled = datetime.datetime.utcnow()

521

if not hasattr(self, "expires"):

522

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

523

+ self.timeout)

524

else:

525

self.last_enabled = None

526

self.expires = None

527

528

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

529

# Uppercase and remove spaces from fingerprint for later

530

# comparison purposes with return value from the fingerprint()

531

# function

532

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

533

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

534

datetime.datetime.utcnow())

535

536

# attributes specific for this server instance

537

self.checker = None

538

self.checker_initiator_tag = None

539

self.disable_initiator_tag = None

540

self.checker_callback_tag = None

541

self.current_checker_command = None

542

self.approved = None

543

self.approvals_pending = 0

544

self.changedstate = (multiprocessing_manager

545

.Condition(multiprocessing_manager

546

.Lock()))

547

self.client_structure = [attr for attr in

548

self.__dict__.iterkeys()

549

if not attr.startswith("_")]

550

self.client_structure.append("client_structure")

551

552

for name, t in inspect.getmembers(type(self),

553

lambda obj:

554

isinstance(obj,

555

property)):

556

if not name.startswith("_"):

557

self.client_structure.append(name)

558

559

# Send notice to process children that client state has changed

560

def send_changedstate(self):

561

with self.changedstate:

562

self.changedstate.notify_all()

563

564

def enable(self):

565

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

566

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

567

# Already enabled

568

return

569

self.send_changedstate()

570

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

571

self.enabled = True

572

self.last_enabled = datetime.datetime.utcnow()

573

self.init_checker()

574

575

def disable(self, quiet=True):

576

"""Disable this client."""

577

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

578

return False

579

if not quiet:

580

self.send_changedstate()

581

if not quiet:

582

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

583

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

584

gobject.source_remove(self.disable_initiator_tag)

585

self.disable_initiator_tag = None

586

self.expires = None

587

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

588

gobject.source_remove(self.checker_initiator_tag)

589

self.checker_initiator_tag = None

590

self.stop_checker()

591

self.enabled = False

592

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

593

return False

594

595

def __del__(self):

596

self.disable()

597

598

def init_checker(self):

599

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

600

# and every interval from then on.

601

self.checker_initiator_tag = (gobject.timeout_add

602

(self.interval_milliseconds(),

603

self.start_checker))

604

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

605

self.disable_initiator_tag = (gobject.timeout_add

606

(self.timeout_milliseconds(),

607

self.disable))

608

# Also start a new checker *right now*.

609

self.start_checker()

610

611

def checker_callback(self, pid, condition, command):

612

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

613

self.checker_callback_tag = None

614

self.checker = None

615

if os.WIFEXITED(condition):

616

self.last_checker_status = os.WEXITSTATUS(condition)

617

if self.last_checker_status == 0:

618

logger.info("Checker for %(name)s succeeded",

619

vars(self))

620

self.checked_ok()

621

else:

622

logger.info("Checker for %(name)s failed",

623

vars(self))

624

else:

625

self.last_checker_status = -1

626

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

627

vars(self))

628

629

def checked_ok(self, timeout=None):

630

"""Bump up the timeout for this client.

631

632

This should only be called when the client has been seen,

633

alive and well.

634

"""

635

if timeout is None:

636

timeout = self.timeout

637

self.last_checked_ok = datetime.datetime.utcnow()

638

if self.disable_initiator_tag is not None:

639

gobject.source_remove(self.disable_initiator_tag)

640

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

641

self.disable_initiator_tag = (gobject.timeout_add

642

(timedelta_to_milliseconds

643

(timeout), self.disable))

644

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

645

646

def need_approval(self):

647

self.last_approval_request = datetime.datetime.utcnow()

648

649

def start_checker(self):

650

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

651

652

If a checker already exists, leave it running and do

653

nothing."""

654

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

655

# did that, then if a checker (for some reason) started

656

# running slowly and taking more than 'interval' time, the

657

# client would inevitably timeout, since no checker would get

658

# a chance to run to completion. If we instead leave running

659

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

660

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

661

# should be.

662

663

# If a checker exists, make sure it is not a zombie

664

try:

665

pid, status = os.waitpid(self.checker.pid, os.WNOHANG)

666

except (AttributeError, OSError) as error:

667

if (isinstance(error, OSError)

668

and error.errno != errno.ECHILD):

669

raise error

670

else:

671

if pid:

672

logger.warning("Checker was a zombie")

673

gobject.source_remove(self.checker_callback_tag)

674

self.checker_callback(pid, status,

675

self.current_checker_command)

676

# Start a new checker if needed

677

if self.checker is None:

678

try:

679

# In case checker_command has exactly one % operator

680

command = self.checker_command % self.host

681

except TypeError:

682

# Escape attributes for the shell

683

escaped_attrs = dict(

684

(attr,

685

re.escape(unicode(str(getattr(self, attr, "")),

686

errors=

687

'replace')))

688

for attr in

689

self.runtime_expansions)

690

691

try:

692

command = self.checker_command % escaped_attrs

693

except TypeError as error:

694

logger.error('Could not format string "%s":'

695

' %s', self.checker_command, error)

696

return True # Try again later

697

self.current_checker_command = command

698

try:

699

logger.info("Starting checker %r for %s",

700

command, self.name)

701

# We don't need to redirect stdout and stderr, since

702

# in normal mode, that is already done by daemon(),

703

# and in debug mode we don't want to. (Stdin is

704

# always replaced by /dev/null.)

705

self.checker = subprocess.Popen(command,

706

close_fds=True,

707

shell=True, cwd="/")

708

self.checker_callback_tag = (gobject.child_watch_add

709

(self.checker.pid,

710

self.checker_callback,

711

data=command))

712

# The checker may have completed before the gobject

713

# watch was added. Check for this.

714

pid, status = os.waitpid(self.checker.pid, os.WNOHANG)

715

if pid:

716

gobject.source_remove(self.checker_callback_tag)

717

self.checker_callback(pid, status, command)

718

except OSError as error:

719

logger.error("Failed to start subprocess: %s",

720

error)

721

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

722

return True

723

724

def stop_checker(self):

725

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

726

if self.checker_callback_tag:

727

gobject.source_remove(self.checker_callback_tag)

728

self.checker_callback_tag = None

729

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

730

return

731

logger.debug("Stopping checker for %(name)s", vars(self))

732

try:

733

os.kill(self.checker.pid, signal.SIGTERM)

734

#time.sleep(0.5)

735

#if self.checker.poll() is None:

736

# os.kill(self.checker.pid, signal.SIGKILL)

737

except OSError as error:

738

if error.errno != errno.ESRCH: # No such process

739

raise

740

self.checker = None

741

742

743

def dbus_service_property(dbus_interface, signature="v",

744

access="readwrite", byte_arrays=False):

745

"""Decorators for marking methods of a DBusObjectWithProperties to

746

become properties on the D-Bus.

747

748

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

749

and with one argument by "Set".

750

751

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

752

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

753

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

754

"""

755

# Encoding deeply encoded byte arrays is not supported yet by the

756

# "Set" method, so we fail early here:

757

if byte_arrays and signature != "ay":

758

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

759

" signature %r" % signature)

760

def decorator(func):

761

func._dbus_is_property = True

762

func._dbus_interface = dbus_interface

763

func._dbus_signature = signature

764

func._dbus_access = access

765

func._dbus_name = func.__name__

766

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

767

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

768

func._dbus_get_args_options = {'byte_arrays': byte_arrays }

769

return func

770

return decorator

771

772

773

class DBusPropertyException(dbus.exceptions.DBusException):

774

"""A base class for D-Bus property-related exceptions

775

"""

776

def __unicode__(self):

777

return unicode(str(self))

778

779

780

class DBusPropertyAccessException(DBusPropertyException):

781

"""A property's access permissions disallows an operation.

782

"""

783

pass

784

785

786

class DBusPropertyNotFound(DBusPropertyException):

787

"""An attempt was made to access a non-existing property.

788

"""

789

pass

790

791

792

class DBusObjectWithProperties(dbus.service.Object):

793

"""A D-Bus object with properties.

794

795

Classes inheriting from this can use the dbus_service_property

796

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

797

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

798

"""

799

800

@staticmethod

801

def _is_dbus_property(obj):

802

return getattr(obj, "_dbus_is_property", False)

803

804

def _get_all_dbus_properties(self):

805

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

806

"""

807

return ((prop.__get__(self)._dbus_name, prop.__get__(self))

808

for cls in self.__class__.__mro__

809

for name, prop in

810

inspect.getmembers(cls, self._is_dbus_property))

811

812

def _get_dbus_property(self, interface_name, property_name):

813

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

814

property with the specified name and interface.

815

"""

816

for cls in self.__class__.__mro__:

817

for name, value in (inspect.getmembers

818

(cls, self._is_dbus_property)):

819

if (value._dbus_name == property_name

820

and value._dbus_interface == interface_name):

821

return value.__get__(self)

822

823

# No such property

824

raise DBusPropertyNotFound(self.dbus_object_path + ":"

825

+ interface_name + "."

826

+ property_name)

827

828

@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",

829

out_signature="v")

830

def Get(self, interface_name, property_name):

831

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

832

"""

833

prop = self._get_dbus_property(interface_name, property_name)

834

if prop._dbus_access == "write":

835

raise DBusPropertyAccessException(property_name)

836

value = prop()

837

if not hasattr(value, "variant_level"):

838

return value

839

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

840

841

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

842

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

843

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

844

"""

845

prop = self._get_dbus_property(interface_name, property_name)

846

if prop._dbus_access == "read":

847

raise DBusPropertyAccessException(property_name)

848

if prop._dbus_get_args_options["byte_arrays"]:

849

# The byte_arrays option is not supported yet on

850

# signatures other than "ay".

851

if prop._dbus_signature != "ay":

852

raise ValueError

853

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

854

for byte in value))

855

prop(value)

856

857

@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",

858

out_signature="a{sv}")

859

def GetAll(self, interface_name):

860

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

861

standard.

862

863

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

864

"""

865

properties = {}

866

for name, prop in self._get_all_dbus_properties():

867

if (interface_name

868

and interface_name != prop._dbus_interface):

869

# Interface non-empty but did not match

870

continue

871

# Ignore write-only properties

872

if prop._dbus_access == "write":

873

continue

874

value = prop()

875

if not hasattr(value, "variant_level"):

876

properties[name] = value

877

continue

878

properties[name] = type(value)(value, variant_level=

879

value.variant_level+1)

880

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

881

882

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

883

out_signature="s",

884

path_keyword='object_path',

885

connection_keyword='connection')

886

def Introspect(self, object_path, connection):

887

"""Standard D-Bus method, overloaded to insert property tags.

888

"""

889

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

890

connection)

891

try:

892

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

893

def make_tag(document, name, prop):

894

e = document.createElement("property")

895

e.setAttribute("name", name)

896

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

897

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

898

return e

899

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

900

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

901

for name, prop

902

in self._get_all_dbus_properties()

903

if prop._dbus_interface

904

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

905

if_tag.appendChild(tag)

906

# Add the names to the return values for the

907

# "org.freedesktop.DBus.Properties" methods

908

if (if_tag.getAttribute("name")

909

== "org.freedesktop.DBus.Properties"):

910

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

911

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

912

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

913

if (arg.getAttribute("direction")

914

== "out"):

915

arg.setAttribute("name", "value")

916

elif cn.getAttribute("name") == "GetAll":

917

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

918

if (arg.getAttribute("direction")

919

== "out"):

920

arg.setAttribute("name", "props")

921

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

922

document.unlink()

923

except (AttributeError, xml.dom.DOMException,

924

xml.parsers.expat.ExpatError) as error:

925

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

926

error)

927

return xmlstring

928

929

930

def datetime_to_dbus (dt, variant_level=0):

931

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

932

if dt is None:

933

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

934

return dbus.String(dt.isoformat(),

935

variant_level=variant_level)

936

937

938

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

939

.__metaclass__):

940

"""Applied to an empty subclass of a D-Bus object, this metaclass

941

will add additional D-Bus attributes matching a certain pattern.

942

"""

943

def __new__(mcs, name, bases, attr):

944

# Go through all the base classes which could have D-Bus

945

# methods, signals, or properties in them

946

for base in (b for b in bases

947

if issubclass(b, dbus.service.Object)):

948

# Go though all attributes of the base class

949

for attrname, attribute in inspect.getmembers(base):

950

# Ignore non-D-Bus attributes, and D-Bus attributes

951

# with the wrong interface name

952

if (not hasattr(attribute, "_dbus_interface")

953

or not attribute._dbus_interface

954

.startswith("se.recompile.Mandos")):

955

continue

956

# Create an alternate D-Bus interface name based on

957

# the current name

958

alt_interface = (attribute._dbus_interface

959

.replace("se.recompile.Mandos",

960

"se.bsnet.fukt.Mandos"))

961

# Is this a D-Bus signal?

962

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

963

# Extract the original non-method function by

964

# black magic

965

nonmethod_func = (dict(

966

zip(attribute.func_code.co_freevars,

967

attribute.__closure__))["func"]

968

.cell_contents)

969

# Create a new, but exactly alike, function

970

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

971

# with the alternate D-Bus interface name

972

new_function = (dbus.service.signal

973

(alt_interface,

974

attribute._dbus_signature)

975

(types.FunctionType(

976

nonmethod_func.func_code,

977

nonmethod_func.func_globals,

978

nonmethod_func.func_name,

979

nonmethod_func.func_defaults,

980

nonmethod_func.func_closure)))

981

# Define a creator of a function to call both the

982

# old and new functions, so both the old and new

983

# signals gets sent when the function is called

984

def fixscope(func1, func2):

985

"""This function is a scope container to pass

986

func1 and func2 to the "call_both" function

987

outside of its arguments"""

988

def call_both(*args, **kwargs):

989

"""This function will emit two D-Bus

990

signals by calling func1 and func2"""

991

func1(*args, **kwargs)

992

func2(*args, **kwargs)

993

return call_both

994

# Create the "call_both" function and add it to

995

# the class

996

attr[attrname] = fixscope(attribute,

997

new_function)

998

# Is this a D-Bus method?

999

elif getattr(attribute, "_dbus_is_method", False):

1000

# Create a new, but exactly alike, function

1001

# object. Decorate it to be a new D-Bus method

1002

# with the alternate D-Bus interface name. Add it

1003

# to the class.

1004

attr[attrname] = (dbus.service.method

1005

(alt_interface,

1006

attribute._dbus_in_signature,

1007

attribute._dbus_out_signature)

1008

(types.FunctionType

1009

(attribute.func_code,

1010

attribute.func_globals,

1011

attribute.func_name,

1012

attribute.func_defaults,

1013

attribute.func_closure)))

1014

# Is this a D-Bus property?

1015

elif getattr(attribute, "_dbus_is_property", False):

1016

# Create a new, but exactly alike, function

1017

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

1018

# property with the alternate D-Bus interface

1019

# name. Add it to the class.

1020

attr[attrname] = (dbus_service_property

1021

(alt_interface,

1022

attribute._dbus_signature,

1023

attribute._dbus_access,

1024

attribute

1025

._dbus_get_args_options

1026

["byte_arrays"])

1027

(types.FunctionType

1028

(attribute.func_code,

1029

attribute.func_globals,

1030

attribute.func_name,

1031

attribute.func_defaults,

1032

attribute.func_closure)))

1033

return type.__new__(mcs, name, bases, attr)

1034

1035

1036

class ClientDBus(Client, DBusObjectWithProperties):

1037

"""A Client class using D-Bus

1038

1039

Attributes:

1040

dbus_object_path: dbus.ObjectPath

1041

bus: dbus.SystemBus()

1042

"""

1043

1044

runtime_expansions = (Client.runtime_expansions

1045

+ ("dbus_object_path",))

1046

1047

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

1048

1049

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

1050

self.bus = bus

1051

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

1052

self._approvals_pending = 0

1053

1054

self._approvals_pending = 0

1055

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

1056

# the D-Bus

1057

client_object_name = unicode(self.name).translate(

1058

{ord("."): ord("_"),

1059

ord("-"): ord("_")})

1060

self.dbus_object_path = (dbus.ObjectPath

1061

("/clients/" + client_object_name))

1062

DBusObjectWithProperties.__init__(self, self.bus,

1063

self.dbus_object_path)

1064

1065

def notifychangeproperty(transform_func,

1066

dbus_name, type_func=lambda x: x,

1067

variant_level=1):

1068

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

1069

its changes to DBus.

1070

1071

transform_fun: Function that takes a value and a variant_level

1072

and transforms it to a D-Bus type.

1073

dbus_name: D-Bus name of the variable

1074

type_func: Function that transform the value before sending it

1075

to the D-Bus. Default: no transform

1076

variant_level: D-Bus variant level. Default: 1

1077

"""

1078

attrname = "_{0}".format(dbus_name)

1079

def setter(self, value):

1080

if hasattr(self, "dbus_object_path"):

1081

if (not hasattr(self, attrname) or

1082

type_func(getattr(self, attrname, None))

1083

!= type_func(value)):

1084

dbus_value = transform_func(type_func(value),

1085

variant_level

1086

=variant_level)

1087

self.PropertyChanged(dbus.String(dbus_name),

1088

dbus_value)

1089

setattr(self, attrname, value)

1090

1091

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

1092

1093

1094

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1095

approvals_pending = notifychangeproperty(dbus.Boolean,

1096

"ApprovalPending",

1097

type_func = bool)

1098

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

1099

last_enabled = notifychangeproperty(datetime_to_dbus,

1100

"LastEnabled")

1101

checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",

1102

type_func = lambda checker:

1103

checker is not None)

1104

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1105

"LastCheckedOK")

1106

last_approval_request = notifychangeproperty(

1107

datetime_to_dbus, "LastApprovalRequest")

1108

approved_by_default = notifychangeproperty(dbus.Boolean,

1109

"ApprovedByDefault")

1110

approval_delay = notifychangeproperty(dbus.UInt64,

1111

"ApprovalDelay",

1112

type_func =

1113

timedelta_to_milliseconds)

1114

approval_duration = notifychangeproperty(

1115

dbus.UInt64, "ApprovalDuration",

1116

type_func = timedelta_to_milliseconds)

1117

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

1118

timeout = notifychangeproperty(dbus.UInt64, "Timeout",

1119

type_func =

1120

timedelta_to_milliseconds)

1121

extended_timeout = notifychangeproperty(

1122

dbus.UInt64, "ExtendedTimeout",

1123

type_func = timedelta_to_milliseconds)

1124

interval = notifychangeproperty(dbus.UInt64,

1125

"Interval",

1126

type_func =

1127

timedelta_to_milliseconds)

1128

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

1129

1130

del notifychangeproperty

1131

1132

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

1133

try:

1134

self.remove_from_connection()

1135

except LookupError:

1136

pass

1137

if hasattr(DBusObjectWithProperties, "__del__"):

1138

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

1139

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

1140

1141

def checker_callback(self, pid, condition, command,

1142

*args, **kwargs):

1143

self.checker_callback_tag = None

1144

self.checker = None

1145

if os.WIFEXITED(condition):

1146

exitstatus = os.WEXITSTATUS(condition)

1147

# Emit D-Bus signal

1148

self.CheckerCompleted(dbus.Int16(exitstatus),

1149

dbus.Int64(condition),

1150

dbus.String(command))

1151

else:

1152

# Emit D-Bus signal

1153

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

1154

dbus.Int64(condition),

1155

dbus.String(command))

1156

1157

return Client.checker_callback(self, pid, condition, command,

1158

*args, **kwargs)

1159

1160

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

1161

old_checker = self.checker

1162

if self.checker is not None:

1163

old_checker_pid = self.checker.pid

1164

else:

1165

old_checker_pid = None

1166

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

1167

# Only if new checker process was started

1168

if (self.checker is not None

1169

and old_checker_pid != self.checker.pid):

1170

# Emit D-Bus signal

1171

self.CheckerStarted(self.current_checker_command)

1172

return r

1173

1174

def _reset_approved(self):

1175

self.approved = None

1176

return False

1177

1178

def approve(self, value=True):

1179

self.send_changedstate()

1180

self.approved = value

1181

gobject.timeout_add(timedelta_to_milliseconds

1182

(self.approval_duration),

1183

self._reset_approved)

1184

1185

1186

## D-Bus methods, signals & properties

1187

_interface = "se.recompile.Mandos.Client"

1188

1189

## Signals

1190

1191

# CheckerCompleted - signal

1192

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

1193

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

1194

"D-Bus signal"

1195

pass

1196

1197

# CheckerStarted - signal

1198

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

1199

def CheckerStarted(self, command):

1200

"D-Bus signal"

1201

pass

1202

1203

# PropertyChanged - signal

1204

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

1205

def PropertyChanged(self, property, value):

1206

"D-Bus signal"

1207

pass

1208

1209

# GotSecret - signal

1210

@dbus.service.signal(_interface)

1211

def GotSecret(self):

1212

"""D-Bus signal

1213

Is sent after a successful transfer of secret from the Mandos

1214

server to mandos-client

1215

"""

1216

pass

1217

1218

# Rejected - signal

1219

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

1220

def Rejected(self, reason):

1221

"D-Bus signal"

1222

pass

1223

1224

# NeedApproval - signal

1225

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

1226

def NeedApproval(self, timeout, default):

1227

"D-Bus signal"

1228

return self.need_approval()

1229

1230

# NeRwequest - signal

1231

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

1232

def NewRequest(self, ip):

1233

"""D-Bus signal

1234

Is sent after a client request a password.

1235

"""

1236

pass

1237

1238

## Methods

1239

1240

# Approve - method

1241

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

1242

def Approve(self, value):

1243

self.approve(value)

1244

1245

# CheckedOK - method

1246

@dbus.service.method(_interface)

1247

def CheckedOK(self):

1248

self.checked_ok()

1249

1250

# Enable - method

1251

@dbus.service.method(_interface)

1252

def Enable(self):

1253

"D-Bus method"

1254

self.enable()

1255

1256

# StartChecker - method

1257

@dbus.service.method(_interface)

1258

def StartChecker(self):

1259

"D-Bus method"

1260

self.start_checker()

1261

1262

# Disable - method

1263

@dbus.service.method(_interface)

1264

def Disable(self):

1265

"D-Bus method"

1266

self.disable()

1267

1268

# StopChecker - method

1269

@dbus.service.method(_interface)

1270

def StopChecker(self):

1271

self.stop_checker()

1272

1273

## Properties

1274

1275

# ApprovalPending - property

1276

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

1277

def ApprovalPending_dbus_property(self):

1278

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

1279

1280

# ApprovedByDefault - property

1281

@dbus_service_property(_interface, signature="b",

1282

access="readwrite")

1283

def ApprovedByDefault_dbus_property(self, value=None):

1284

if value is None: # get

1285

return dbus.Boolean(self.approved_by_default)

1286

self.approved_by_default = bool(value)

1287

1288

# ApprovalDelay - property

1289

@dbus_service_property(_interface, signature="t",

1290

access="readwrite")

1291

def ApprovalDelay_dbus_property(self, value=None):

1292

if value is None: # get

1293

return dbus.UInt64(self.approval_delay_milliseconds())

1294

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

1295

1296

# ApprovalDuration - property

1297

@dbus_service_property(_interface, signature="t",

1298

access="readwrite")

1299

def ApprovalDuration_dbus_property(self, value=None):

1300

if value is None: # get

1301

return dbus.UInt64(timedelta_to_milliseconds(

1302

self.approval_duration))

1303

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

1304

1305

# Name - property

1306

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

1307

def Name_dbus_property(self):

1308

return dbus.String(self.name)

1309

1310

# Fingerprint - property

1311

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

1312

def Fingerprint_dbus_property(self):

1313

return dbus.String(self.fingerprint)

1314

1315

# Host - property

1316

@dbus_service_property(_interface, signature="s",

1317

access="readwrite")

1318

def Host_dbus_property(self, value=None):

1319

if value is None: # get

1320

return dbus.String(self.host)

1321

self.host = unicode(value)

1322

1323

# Created - property

1324

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

1325

def Created_dbus_property(self):

1326

return datetime_to_dbus(self.created)

1327

1328

# LastEnabled - property

1329

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

1330

def LastEnabled_dbus_property(self):

1331

return datetime_to_dbus(self.last_enabled)

1332

1333

# Enabled - property

1334

@dbus_service_property(_interface, signature="b",

1335

access="readwrite")

1336

def Enabled_dbus_property(self, value=None):

1337

if value is None: # get

1338

return dbus.Boolean(self.enabled)

1339

if value:

1340

self.enable()

1341

else:

1342

self.disable()

1343

1344

# LastCheckedOK - property

1345

@dbus_service_property(_interface, signature="s",

1346

access="readwrite")

1347

def LastCheckedOK_dbus_property(self, value=None):

1348

if value is not None:

1349

self.checked_ok()

1350

return

1351

return datetime_to_dbus(self.last_checked_ok)

1352

1353

# Expires - property

1354

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

1355

def Expires_dbus_property(self):

1356

return datetime_to_dbus(self.expires)

1357

1358

# LastApprovalRequest - property

1359

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

1360

def LastApprovalRequest_dbus_property(self):

1361

return datetime_to_dbus(self.last_approval_request)

1362

1363

# Timeout - property

1364

@dbus_service_property(_interface, signature="t",

1365

access="readwrite")

1366

def Timeout_dbus_property(self, value=None):

1367

if value is None: # get

1368

return dbus.UInt64(self.timeout_milliseconds())

1369

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

1370

# Reschedule timeout

1371

if self.enabled:

1372

now = datetime.datetime.utcnow()

1373

time_to_die = timedelta_to_milliseconds(

1374

(self.last_checked_ok + self.timeout) - now)

1375

if time_to_die <= 0:

1376

# The timeout has passed

1377

self.disable()

1378

else:

1379

self.expires = (now +

1380

datetime.timedelta(milliseconds =

1381

time_to_die))

1382

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

1383

is None):

1384

return

1385

gobject.source_remove(self.disable_initiator_tag)

1386

self.disable_initiator_tag = (gobject.timeout_add

1387

(time_to_die,

1388

self.disable))

1389

1390

# ExtendedTimeout - property

1391

@dbus_service_property(_interface, signature="t",

1392

access="readwrite")

1393

def ExtendedTimeout_dbus_property(self, value=None):

1394

if value is None: # get

1395

return dbus.UInt64(self.extended_timeout_milliseconds())

1396

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

1397

1398

# Interval - property

1399

@dbus_service_property(_interface, signature="t",

1400

access="readwrite")

1401

def Interval_dbus_property(self, value=None):

1402

if value is None: # get

1403

return dbus.UInt64(self.interval_milliseconds())

1404

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

1405

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

1406

return

1407

if self.enabled:

1408

# Reschedule checker run

1409

gobject.source_remove(self.checker_initiator_tag)

1410

self.checker_initiator_tag = (gobject.timeout_add

1411

(value, self.start_checker))

1412

self.start_checker() # Start one now, too

1413

1414

# Checker - property

1415

@dbus_service_property(_interface, signature="s",

1416

access="readwrite")

1417

def Checker_dbus_property(self, value=None):

1418

if value is None: # get

1419

return dbus.String(self.checker_command)

1420

self.checker_command = unicode(value)

1421

1422

# CheckerRunning - property

1423

@dbus_service_property(_interface, signature="b",

1424

access="readwrite")

1425

def CheckerRunning_dbus_property(self, value=None):

1426

if value is None: # get

1427

return dbus.Boolean(self.checker is not None)

1428

if value:

1429

self.start_checker()

1430

else:

1431

self.stop_checker()

1432

1433

# ObjectPath - property

1434

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

1435

def ObjectPath_dbus_property(self):

1436

return self.dbus_object_path # is already a dbus.ObjectPath

1437

1438

# Secret = property

1439

@dbus_service_property(_interface, signature="ay",

1440

access="write", byte_arrays=True)

1441

def Secret_dbus_property(self, value):

1442

self.secret = str(value)

1443

1444

del _interface

1445

1446

1447

class ProxyClient(object):

1448

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

1449

self._pipe = child_pipe

1450

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

1451

if not self._pipe.recv():

1452

raise KeyError()

1453

1454

def __getattribute__(self, name):

1455

if name == '_pipe':

1456

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

1457

self._pipe.send(('getattr', name))

1458

data = self._pipe.recv()

1459

if data[0] == 'data':

1460

return data[1]

1461

if data[0] == 'function':

1462

def func(*args, **kwargs):

1463

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

1464

return self._pipe.recv()[1]

1465

return func

1466

1467

def __setattr__(self, name, value):

1468

if name == '_pipe':

1469

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

1470

self._pipe.send(('setattr', name, value))

1471

1472

1473

class ClientDBusTransitional(ClientDBus):

1474

__metaclass__ = AlternateDBusNamesMetaclass

1475

1476

1477

class ClientHandler(socketserver.BaseRequestHandler, object):

1478

"""A class to handle client connections.

1479

1480

Instantiated once for each connection to handle it.

1481

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

1482

1483

def handle(self):

1484

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

1485

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

1486

unicode(self.client_address))

1487

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

1488

self.server.child_pipe.fileno())

1489

1490

session = (gnutls.connection

1491

.ClientSession(self.request,

1492

gnutls.connection

1493

.X509Credentials()))

1494

1495

# Note: gnutls.connection.X509Credentials is really a

1496

# generic GnuTLS certificate credentials object so long as

1497

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

1498

# here despite using OpenPGP certificates.

1499

1500

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

1501

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

1502

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

1503

# "+DHE-DSS"))

1504

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

1505

priority = self.server.gnutls_priority

1506

if priority is None:

1507

priority = "NORMAL"

1508

(gnutls.library.functions

1509

.gnutls_priority_set_direct(session._c_object,

1510

priority, None))

1511

1512

# Start communication using the Mandos protocol

1513

# Get protocol number

1514

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

1515

logger.debug("Protocol version: %r", line)

1516

try:

1517

if int(line.strip().split()[0]) > 1:

1518

raise RuntimeError

1519

except (ValueError, IndexError, RuntimeError) as error:

1520

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

1521

return

1522

1523

# Start GnuTLS connection

1524

try:

1525

session.handshake()

1526

except gnutls.errors.GNUTLSError as error:

1527

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

1528

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

1529

# established. Just abandon the request.

1530

return

1531

logger.debug("Handshake succeeded")

1532

1533

approval_required = False

1534

try:

1535

try:

1536

fpr = self.fingerprint(self.peer_certificate

1537

(session))

1538

except (TypeError,

1539

gnutls.errors.GNUTLSError) as error:

1540

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

1541

return

1542

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

1543

1544

try:

1545

client = ProxyClient(child_pipe, fpr,

1546

self.client_address)

1547

except KeyError:

1548

return

1549

1550

if self.server.use_dbus:

1551

# Emit D-Bus signal

1552

client.NewRequest(str(self.client_address))

1553

1554

if client.approval_delay:

1555

delay = client.approval_delay

1556

client.approvals_pending += 1

1557

approval_required = True

1558

1559

while True:

1560

if not client.enabled:

1561

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

1562

client.name)

1563

if self.server.use_dbus:

1564

# Emit D-Bus signal

1565

client.Rejected("Disabled")

1566

return

1567

1568

if client.approved or not client.approval_delay:

1569

#We are approved or approval is disabled

1570

break

1571

elif client.approved is None:

1572

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

1573

client.name)

1574

if self.server.use_dbus:

1575

# Emit D-Bus signal

1576

client.NeedApproval(

1577

client.approval_delay_milliseconds(),

1578

client.approved_by_default)

1579

else:

1580

logger.warning("Client %s was not approved",

1581

client.name)

1582

if self.server.use_dbus:

1583

# Emit D-Bus signal

1584

client.Rejected("Denied")

1585

return

1586

1587

#wait until timeout or approved

1588

time = datetime.datetime.now()

1589

client.changedstate.acquire()

1590

(client.changedstate.wait

1591

(float(client.timedelta_to_milliseconds(delay)

1592

/ 1000)))

1593

client.changedstate.release()

1594

time2 = datetime.datetime.now()

1595

if (time2 - time) >= delay:

1596

if not client.approved_by_default:

1597

logger.warning("Client %s timed out while"

1598

" waiting for approval",

1599

client.name)

1600

if self.server.use_dbus:

1601

# Emit D-Bus signal

1602

client.Rejected("Approval timed out")

1603

return

1604

else:

1605

break

1606

else:

1607

delay -= time2 - time

1608

1609

sent_size = 0

1610

while sent_size < len(client.secret):

1611

try:

1612

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

1613

except gnutls.errors.GNUTLSError as error:

1614

logger.warning("gnutls send failed")

1615

return

1616

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

1617

sent, len(client.secret)

1618

- (sent_size + sent))

1619

sent_size += sent

1620

1621

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

1622

# bump the timeout using extended_timeout

1623

client.checked_ok(client.extended_timeout)

1624

if self.server.use_dbus:

1625

# Emit D-Bus signal

1626

client.GotSecret()

1627

1628

finally:

1629

if approval_required:

1630

client.approvals_pending -= 1

1631

try:

1632

session.bye()

1633

except gnutls.errors.GNUTLSError as error:

1634

logger.warning("GnuTLS bye failed")

1635

1636

@staticmethod

1637

def peer_certificate(session):

1638

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

1639

# If not an OpenPGP certificate...

1640

if (gnutls.library.functions

1641

.gnutls_certificate_type_get(session._c_object)

1642

!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

1643

# ...do the normal thing

1644

return session.peer_certificate

1645

list_size = ctypes.c_uint(1)

1646

cert_list = (gnutls.library.functions

1647

.gnutls_certificate_get_peers

1648

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

1649

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

1650

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

1651

" certificate")

1652

if list_size.value == 0:

1653

return None

1654

cert = cert_list[0]

1655

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

1656

1657

@staticmethod

1658

def fingerprint(openpgp):

1659

"Convert an OpenPGP bytestring to a hexdigit fingerprint"

1660

# New GnuTLS "datum" with the OpenPGP public key

1661

datum = (gnutls.library.types

1662

.gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),

1663

ctypes.POINTER

1664

(ctypes.c_ubyte)),

1665

ctypes.c_uint(len(openpgp))))

1666

# New empty GnuTLS certificate

1667

crt = gnutls.library.types.gnutls_openpgp_crt_t()

1668

(gnutls.library.functions

1669

.gnutls_openpgp_crt_init(ctypes.byref(crt)))

1670

# Import the OpenPGP public key into the certificate

1671

(gnutls.library.functions

1672

.gnutls_openpgp_crt_import(crt, ctypes.byref(datum),

1673

gnutls.library.constants

1674

.GNUTLS_OPENPGP_FMT_RAW))

1675

# Verify the self signature in the key

1676

crtverify = ctypes.c_uint()

1677

(gnutls.library.functions

1678

.gnutls_openpgp_crt_verify_self(crt, 0,

1679

ctypes.byref(crtverify)))

1680

if crtverify.value != 0:

1681

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1682

raise (gnutls.errors.CertificateSecurityError

1683

("Verify failed"))

1684

# New buffer for the fingerprint

1685

buf = ctypes.create_string_buffer(20)

1686

buf_len = ctypes.c_size_t()

1687

# Get the fingerprint from the certificate into the buffer

1688

(gnutls.library.functions

1689

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

1690

ctypes.byref(buf_len)))

1691

# Deinit the certificate

1692

gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)

1693

# Convert the buffer to a Python bytestring

1694

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

1695

# Convert the bytestring to hexadecimal notation

1696

hex_fpr = binascii.hexlify(fpr).upper()

1697

return hex_fpr

1698

1699

1700

class MultiprocessingMixIn(object):

1701

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

1702

def sub_process_main(self, request, address):

1703

try:

1704

self.finish_request(request, address)

1705

except Exception:

1706

self.handle_error(request, address)

1707

self.close_request(request)

1708

1709

def process_request(self, request, address):

1710

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

1711

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

1712

args = (request,

1713

address))

1714

proc.start()

1715

return proc

1716

1717

1718

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1719

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

1720

def process_request(self, request, client_address):

1721

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

1722

1723

This function creates a new pipe in self.pipe

1724

"""

1725

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1726

1727

proc = MultiprocessingMixIn.process_request(self, request,

1728

client_address)

1729

self.child_pipe.close()

1730

self.add_pipe(parent_pipe, proc)

1731

1732

def add_pipe(self, parent_pipe, proc):

1733

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

1734

raise NotImplementedError

1735

1736

1737

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1738

socketserver.TCPServer, object):

1739

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

1740

1741

Attributes:

1742

enabled: Boolean; whether this server is activated yet

1743

interface: None or a network interface name (string)

1744

use_ipv6: Boolean; to use IPv6 or not

1745

"""

1746

def __init__(self, server_address, RequestHandlerClass,

1747

interface=None, use_ipv6=True):

1748

self.interface = interface

1749

if use_ipv6:

1750

self.address_family = socket.AF_INET6

1751

socketserver.TCPServer.__init__(self, server_address,

1752

RequestHandlerClass)

1753

def server_bind(self):

1754

"""This overrides the normal server_bind() function

1755

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

1756

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

1757

if self.interface is not None:

1758

if SO_BINDTODEVICE is None:

1759

logger.error("SO_BINDTODEVICE does not exist;"

1760

" cannot bind to interface %s",

1761

self.interface)

1762

else:

1763

try:

1764

self.socket.setsockopt(socket.SOL_SOCKET,

1765

SO_BINDTODEVICE,

1766

str(self.interface

1767

+ '\0'))

1768

except socket.error as error:

1769

if error[0] == errno.EPERM:

1770

logger.error("No permission to"

1771

" bind to interface %s",

1772

self.interface)

1773

elif error[0] == errno.ENOPROTOOPT:

1774

logger.error("SO_BINDTODEVICE not available;"

1775

" cannot bind to interface %s",

1776

self.interface)

1777

else:

1778

raise

1779

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

1780

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

1781

if not self.server_address[0]:

1782

if self.address_family == socket.AF_INET6:

1783

any_address = "::" # in6addr_any

1784

else:

1785

any_address = socket.INADDR_ANY

1786

self.server_address = (any_address,

1787

self.server_address[1])

1788

elif not self.server_address[1]:

1789

self.server_address = (self.server_address[0],

1790

0)

1791

# if self.interface:

1792

# self.server_address = (self.server_address[0],

1793

# 0, # port

1794

# 0, # flowinfo

1795

# if_nametoindex

1796

# (self.interface))

1797

return socketserver.TCPServer.server_bind(self)

1798

1799

1800

class MandosServer(IPv6_TCPServer):

1801

"""Mandos server.

1802

1803

Attributes:

1804

clients: set of Client objects

1805

gnutls_priority GnuTLS priority string

1806

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

1807

1808

Assumes a gobject.MainLoop event loop.

1809

"""

1810

def __init__(self, server_address, RequestHandlerClass,

1811

interface=None, use_ipv6=True, clients=None,

1812

gnutls_priority=None, use_dbus=True):

1813

self.enabled = False

1814

self.clients = clients

1815

if self.clients is None:

1816

self.clients = {}

1817

self.use_dbus = use_dbus

1818

self.gnutls_priority = gnutls_priority

1819

IPv6_TCPServer.__init__(self, server_address,

1820

RequestHandlerClass,

1821

interface = interface,

1822

use_ipv6 = use_ipv6)

1823

def server_activate(self):

1824

if self.enabled:

1825

return socketserver.TCPServer.server_activate(self)

1826

1827

def enable(self):

1828

self.enabled = True

1829

1830

def add_pipe(self, parent_pipe, proc):

1831

# Call "handle_ipc" for both data and EOF events

1832

gobject.io_add_watch(parent_pipe.fileno(),

1833

gobject.IO_IN | gobject.IO_HUP,

1834

functools.partial(self.handle_ipc,

1835

parent_pipe =

1836

parent_pipe,

1837

proc = proc))

1838

1839

def handle_ipc(self, source, condition, parent_pipe=None,

1840

proc = None, client_object=None):

1841

condition_names = {

1842

gobject.IO_IN: "IN", # There is data to read.

1843

gobject.IO_OUT: "OUT", # Data can be written (without

1844

# blocking).

1845

gobject.IO_PRI: "PRI", # There is urgent data to read.

1846

gobject.IO_ERR: "ERR", # Error condition.

1847

gobject.IO_HUP: "HUP" # Hung up (the connection has been

1848

# broken, usually for pipes and

1849

# sockets).

1850

}

1851

conditions_string = ' | '.join(name

1852

for cond, name in

1853

condition_names.iteritems()

1854

if cond & condition)

1855

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

1856

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

1857

# Wait for other process to exit

1858

proc.join()

1859

return False

1860

1861

# Read a request from the child

1862

request = parent_pipe.recv()

1863

command = request[0]

1864

1865

if command == 'init':

1866

fpr = request[1]

1867

address = request[2]

1868

1869

for c in self.clients.itervalues():

1870

if c.fingerprint == fpr:

1871

client = c

1872

break

1873

else:

1874

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

1875

"dress: %s", fpr, address)

1876

if self.use_dbus:

1877

# Emit D-Bus signal

1878

mandos_dbus_service.ClientNotFound(fpr,

1879

address[0])

1880

parent_pipe.send(False)

1881

return False

1882

1883

gobject.io_add_watch(parent_pipe.fileno(),

1884

gobject.IO_IN | gobject.IO_HUP,

1885

functools.partial(self.handle_ipc,

1886

parent_pipe =

1887

parent_pipe,

1888

proc = proc,

1889

client_object =

1890

client))

1891

parent_pipe.send(True)

1892

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

1893

# same fileno

1894

return False

1895

if command == 'funcall':

1896

funcname = request[1]

1897

args = request[2]

1898

kwargs = request[3]

1899

1900

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

1901

funcname)(*args,

1902

**kwargs)))

1903

1904

if command == 'getattr':

1905

attrname = request[1]

1906

if callable(client_object.__getattribute__(attrname)):

1907

parent_pipe.send(('function',))

1908

else:

1909

parent_pipe.send(('data', client_object

1910

.__getattribute__(attrname)))

1911

1912

if command == 'setattr':

1913

attrname = request[1]

1914

value = request[2]

1915

setattr(client_object, attrname, value)

1916

1917

return True

1918

1919

1920

def string_to_delta(interval):

1921

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

1922

1923

>>> string_to_delta('7d')

1924

datetime.timedelta(7)

1925

>>> string_to_delta('60s')

1926

datetime.timedelta(0, 60)

1927

>>> string_to_delta('60m')

1928

datetime.timedelta(0, 3600)

1929

>>> string_to_delta('24h')

1930

datetime.timedelta(1)

1931

>>> string_to_delta('1w')

1932

datetime.timedelta(7)

1933

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

1934

datetime.timedelta(0, 330)

1935

"""

1936

timevalue = datetime.timedelta(0)

1937

for s in interval.split():

1938

try:

1939

suffix = unicode(s[-1])

1940

value = int(s[:-1])

1941

if suffix == "d":

1942

delta = datetime.timedelta(value)

1943

elif suffix == "s":

1944

delta = datetime.timedelta(0, value)

1945

elif suffix == "m":

1946

delta = datetime.timedelta(0, 0, 0, 0, value)

1947

elif suffix == "h":

1948

delta = datetime.timedelta(0, 0, 0, 0, 0, value)

1949

elif suffix == "w":

1950

delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)

1951

else:

1952

raise ValueError("Unknown suffix %r" % suffix)

1953

except (ValueError, IndexError) as e:

1954

raise ValueError(*(e.args))

1955

timevalue += delta

1956

return timevalue

1957

1958

1959

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

1960

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

1961

1962

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

1963

if os.fork():

1964

sys.exit()

1965

os.setsid()

1966

if not nochdir:

1967

os.chdir("/")

1968

if os.fork():

1969

sys.exit()

1970

if not noclose:

1971

# Close all standard open file descriptors

1972

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

1973

if not stat.S_ISCHR(os.fstat(null).st_mode):

1974

raise OSError(errno.ENODEV,

1975

"%s not a character device"

1976

% os.path.devnull)

1977

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

1978

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

1979

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

1980

if null > 2:

1981

os.close(null)

1982

1983

1984

def main():

1985

1986

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

1987

# Parsing of options, both command line and config file

1988

1989

parser = argparse.ArgumentParser()

1990

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

1991

version = "%%(prog)s %s" % version,

1992

help="show version number and exit")

1993

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

1994

help="Bind to interface IF")

1995

parser.add_argument("-a", "--address",

1996

help="Address to listen for requests on")

1997

parser.add_argument("-p", "--port", type=int,

1998

help="Port number to receive requests on")

1999

parser.add_argument("--check", action="store_true",

2000

help="Run self-test")

2001

parser.add_argument("--debug", action="store_true",

2002

help="Debug mode; run in foreground and log"

2003

" to terminal")

2004

parser.add_argument("--debuglevel", metavar="LEVEL",

2005

help="Debug level for stdout output")

2006

parser.add_argument("--priority", help="GnuTLS"

2007

" priority string (see GnuTLS documentation)")

2008

parser.add_argument("--servicename",

2009

metavar="NAME", help="Zeroconf service name")

2010

parser.add_argument("--configdir",

2011

default="/etc/mandos", metavar="DIR",

2012

help="Directory to search for configuration"

2013

" files")

2014

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

2015

dest="use_dbus", help="Do not provide D-Bus"

2016

" system bus interface")

2017

parser.add_argument("--no-ipv6", action="store_false",

2018

dest="use_ipv6", help="Do not use IPv6")

2019

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

2020

dest="restore", help="Do not restore stored"

2021

" state")

2022

parser.add_argument("--statedir", metavar="DIR",

2023

help="Directory to save/restore state in")

2024

2025

options = parser.parse_args()

2026

2027

if options.check:

2028

import doctest

2029

doctest.testmod()

2030

sys.exit()

2031

2032

# Default values for config file for server-global settings

2033

server_defaults = { "interface": "",

2034

"address": "",

2035

"port": "",

2036

"debug": "False",

2037

"priority":

2038

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

2039

"servicename": "Mandos",

2040

"use_dbus": "True",

2041

"use_ipv6": "True",

2042

"debuglevel": "",

2043

"restore": "True",

2044

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

2045

}

2046

2047

# Parse config file for server-global settings

2048

server_config = configparser.SafeConfigParser(server_defaults)

2049

del server_defaults

2050

server_config.read(os.path.join(options.configdir,

2051

"mandos.conf"))

2052

# Convert the SafeConfigParser object to a dict

2053

server_settings = server_config.defaults()

2054

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

2055

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

2056

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

2057

option)

2058

if server_settings["port"]:

2059

server_settings["port"] = server_config.getint("DEFAULT",

2060

"port")

2061

del server_config

2062

2063

# Override the settings from the config file with command line

2064

# options, if set.

2065

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

2066

"priority", "servicename", "configdir",

2067

"use_dbus", "use_ipv6", "debuglevel", "restore",

2068

"statedir"):

2069

value = getattr(options, option)

2070

if value is not None:

2071

server_settings[option] = value

2072

del options

2073

# Force all strings to be unicode

2074

for option in server_settings.keys():

2075

if type(server_settings[option]) is str:

2076

server_settings[option] = unicode(server_settings[option])

2077

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

2078

2079

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

2080

2081

# For convenience

2082

debug = server_settings["debug"]

2083

debuglevel = server_settings["debuglevel"]

2084

use_dbus = server_settings["use_dbus"]

2085

use_ipv6 = server_settings["use_ipv6"]

2086

stored_state_path = os.path.join(server_settings["statedir"],

2087

stored_state_file)

2088

2089

if debug:

2090

initlogger(debug, logging.DEBUG)

2091

else:

2092

if not debuglevel:

2093

initlogger(debug)

2094

else:

2095

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

2096

initlogger(debug, level)

2097

2098

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

2099

syslogger.setFormatter(logging.Formatter

2100

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

2101

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

2102

% server_settings["servicename"]))

2103

2104

# Parse config file with clients

2105

client_config = configparser.SafeConfigParser(Client

2106

.client_defaults)

2107

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

2108

"clients.conf"))

2109

2110

global mandos_dbus_service

2111

mandos_dbus_service = None

2112

2113

tcp_server = MandosServer((server_settings["address"],

2114

server_settings["port"]),

2115

ClientHandler,

2116

interface=(server_settings["interface"]

2117

or None),

2118

use_ipv6=use_ipv6,

2119

gnutls_priority=

2120

server_settings["priority"],

2121

use_dbus=use_dbus)

2122

if not debug:

2123

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

2124

try:

2125

pidfile = open(pidfilename, "w")

2126

except IOError:

2127

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

2128

2129

try:

2130

uid = pwd.getpwnam("_mandos").pw_uid

2131

gid = pwd.getpwnam("_mandos").pw_gid

2132

except KeyError:

2133

try:

2134

uid = pwd.getpwnam("mandos").pw_uid

2135

gid = pwd.getpwnam("mandos").pw_gid

2136

except KeyError:

2137

try:

2138

uid = pwd.getpwnam("nobody").pw_uid

2139

gid = pwd.getpwnam("nobody").pw_gid

2140

except KeyError:

2141

uid = 65534

2142

gid = 65534

2143

try:

2144

os.setgid(gid)

2145

os.setuid(uid)

2146

except OSError as error:

2147

if error[0] != errno.EPERM:

2148

raise error

2149

2150

if debug:

2151

# Enable all possible GnuTLS debugging

2152

2153

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

2154

# - GnuTLS manual

2155

gnutls.library.functions.gnutls_global_set_log_level(11)

2156

2157

@gnutls.library.types.gnutls_log_func

2158

def debug_gnutls(level, string):

2159

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

2160

2161

(gnutls.library.functions

2162

.gnutls_global_set_log_function(debug_gnutls))

2163

2164

# Redirect stdin so all checkers get /dev/null

2165

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

2166

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

2167

if null > 2:

2168

os.close(null)

2169

2170

# Need to fork before connecting to D-Bus

2171

if not debug:

2172

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

2173

daemon()

2174

2175

gobject.threads_init()

2176

2177

global main_loop

2178

# From the Avahi example code

2179

DBusGMainLoop(set_as_default=True )

2180

main_loop = gobject.MainLoop()

2181

bus = dbus.SystemBus()

2182

# End of Avahi example code

2183

if use_dbus:

2184

try:

2185

bus_name = dbus.service.BusName("se.recompile.Mandos",

2186

bus, do_not_queue=True)

2187

old_bus_name = (dbus.service.BusName

2188

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

2189

do_not_queue=True))

2190

except dbus.exceptions.NameExistsException as e:

2191

logger.error(unicode(e) + ", disabling D-Bus")

2192

use_dbus = False

2193

server_settings["use_dbus"] = False

2194

tcp_server.use_dbus = False

2195

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2196

service = AvahiServiceToSyslog(name =

2197

server_settings["servicename"],

2198

servicetype = "_mandos._tcp",

2199

protocol = protocol, bus = bus)

2200

if server_settings["interface"]:

2201

service.interface = (if_nametoindex

2202

(str(server_settings["interface"])))

2203

2204

global multiprocessing_manager

2205

multiprocessing_manager = multiprocessing.Manager()

2206

2207

client_class = Client

2208

if use_dbus:

2209

client_class = functools.partial(ClientDBusTransitional,

2210

bus = bus)

2211

2212

client_settings = Client.config_parser(client_config)

2213

old_client_settings = {}

2214

clients_data = {}

2215

2216

# Get client data and settings from last running state.

2217

if server_settings["restore"]:

2218

try:

2219

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

2220

clients_data, old_client_settings = (pickle.load

2221

(stored_state))

2222

os.remove(stored_state_path)

2223

except IOError as e:

2224

logger.warning("Could not load persistent state: {0}"

2225

.format(e))

2226

if e.errno != errno.ENOENT:

2227

raise

2228

except EOFError as e:

2229

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

2230

"EOFError: {0}".format(e))

2231

2232

with PGPEngine() as pgp:

2233

for client_name, client in clients_data.iteritems():

2234

# Decide which value to use after restoring saved state.

2235

# We have three different values: Old config file,

2236

# new config file, and saved state.

2237

# New config value takes precedence if it differs from old

2238

# config value, otherwise use saved state.

2239

for name, value in client_settings[client_name].items():

2240

try:

2241

# For each value in new config, check if it

2242

# differs from the old config value (Except for

2243

# the "secret" attribute)

2244

if (name != "secret" and

2245

value != old_client_settings[client_name]

2246

[name]):

2247

client[name] = value

2248

except KeyError:

2249

pass

2250

2251

# Clients who has passed its expire date can still be

2252

# enabled if its last checker was successful. Clients

2253

# whose checker failed before we stored its state is

2254

# assumed to have failed all checkers during downtime.

2255

if client["enabled"]:

2256

if datetime.datetime.utcnow() >= client["expires"]:

2257

if not client["last_checked_ok"]:

2258

logger.warning(

2259

"disabling client {0} - Client never "

2260

"performed a successfull checker"

2261

.format(client["name"]))

2262

client["enabled"] = False

2263

elif client["last_checker_status"] != 0:

2264

logger.warning(

2265

"disabling client {0} - Client "

2266

"last checker failed with error code {1}"

2267

.format(client["name"],

2268

client["last_checker_status"]))

2269

client["enabled"] = False

2270

else:

2271

client["expires"] = (datetime.datetime

2272

.utcnow()

2273

+ client["timeout"])

2274

logger.debug("Last checker succeeded,"

2275

" keeping {0} enabled"

2276

.format(client["name"]))

2277

try:

2278

client["secret"] = (

2279

pgp.decrypt(client["encrypted_secret"],

2280

client_settings[client_name]

2281

["secret"]))

2282

except PGPError:

2283

# If decryption fails, we use secret from new settings

2284

logger.debug("Failed to decrypt {0} old secret"

2285

.format(client_name))

2286

client["secret"] = (

2287

client_settings[client_name]["secret"])

2288

2289

2290

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

2291

for client_name in (set(old_client_settings)

2292

- set(client_settings)):

2293

del clients_data[client_name]

2294

for client_name in (set(client_settings)

2295

- set(old_client_settings)):

2296

clients_data[client_name] = client_settings[client_name]

2297

2298

# Create clients all clients

2299

for client_name, client in clients_data.iteritems():

2300

tcp_server.clients[client_name] = client_class(

2301

name = client_name, settings = client)

2302

2303

if not tcp_server.clients:

2304

logger.warning("No clients defined")

2305

2306

if not debug:

2307

try:

2308

with pidfile:

2309

pid = os.getpid()

2310

pidfile.write(str(pid) + "\n".encode("utf-8"))

2311

del pidfile

2312

except IOError:

2313

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

2314

pidfilename, pid)

2315

except NameError:

2316

# "pidfile" was never created

2317

pass

2318

del pidfilename

2319

signal.signal(signal.SIGINT, signal.SIG_IGN)

2320

2321

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

2322

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

2323

2324

if use_dbus:

2325

class MandosDBusService(dbus.service.Object):

2326

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

2327

def __init__(self):

2328

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

2329

_interface = "se.recompile.Mandos"

2330

2331

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

2332

def ClientAdded(self, objpath):

2333

"D-Bus signal"

2334

pass

2335

2336

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

2337

def ClientNotFound(self, fingerprint, address):

2338

"D-Bus signal"

2339

pass

2340

2341

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

2342

def ClientRemoved(self, objpath, name):

2343

"D-Bus signal"

2344

pass

2345

2346

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

2347

def GetAllClients(self):

2348

"D-Bus method"

2349

return dbus.Array(c.dbus_object_path

2350

for c in

2351

tcp_server.clients.itervalues())

2352

2353

@dbus.service.method(_interface,

2354

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

2355

def GetAllClientsWithProperties(self):

2356

"D-Bus method"

2357

return dbus.Dictionary(

2358

((c.dbus_object_path, c.GetAll(""))

2359

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

2360

signature="oa{sv}")

2361

2362

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

2363

def RemoveClient(self, object_path):

2364

"D-Bus method"

2365

for c in tcp_server.clients.itervalues():

2366

if c.dbus_object_path == object_path:

2367

del tcp_server.clients[c.name]

2368

c.remove_from_connection()

2369

# Don't signal anything except ClientRemoved

2370

c.disable(quiet=True)

2371

# Emit D-Bus signal

2372

self.ClientRemoved(object_path, c.name)

2373

return

2374

raise KeyError(object_path)

2375

2376

del _interface

2377

2378

class MandosDBusServiceTransitional(MandosDBusService):

2379

__metaclass__ = AlternateDBusNamesMetaclass

2380

mandos_dbus_service = MandosDBusServiceTransitional()

2381

2382

def cleanup():

2383

"Cleanup function; run on exit"

2384

service.cleanup()

2385

2386

multiprocessing.active_children()

2387

if not (tcp_server.clients or client_settings):

2388

return

2389

2390

# Store client before exiting. Secrets are encrypted with key

2391

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

2392

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

2393

clients = {}

2394

with PGPEngine() as pgp:

2395

for client in tcp_server.clients.itervalues():

2396

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

2397

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

2398

key)

2399

client_dict = {}

2400

2401

# A list of attributes that can not be pickled

2402

# + secret.

2403

exclude = set(("bus", "changedstate", "secret",

2404

"checker"))

2405

for name, typ in (inspect.getmembers

2406

(dbus.service.Object)):

2407

exclude.add(name)

2408

2409

client_dict["encrypted_secret"] = (client

2410

.encrypted_secret)

2411

for attr in client.client_structure:

2412

if attr not in exclude:

2413

client_dict[attr] = getattr(client, attr)

2414

2415

clients[client.name] = client_dict

2416

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

2417

2418

try:

2419

tempfd, tempname = tempfile.mkstemp(suffix=".pickle",

2420

prefix="clients-",

2421

dir=os.path.dirname

2422

(stored_state_path))

2423

with os.fdopen(tempfd, "wb") as stored_state:

2424

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

2425

os.rename(tempname, stored_state_path)

2426

except (IOError, OSError) as e:

2427

logger.warning("Could not save persistent state: {0}"

2428

.format(e))

2429

if not debug:

2430

try:

2431

os.remove(tempname)

2432

except NameError:

2433

pass

2434

if e.errno not in set((errno.ENOENT, errno.EACCES,

2435

errno.EEXIST)):

2436

raise e

2437

2438

# Delete all clients, and settings from config

2439

while tcp_server.clients:

2440

name, client = tcp_server.clients.popitem()

2441

if use_dbus:

2442

client.remove_from_connection()

2443

# Don't signal anything except ClientRemoved

2444

client.disable(quiet=True)

2445

if use_dbus:

2446

# Emit D-Bus signal

2447

mandos_dbus_service.ClientRemoved(client

2448

.dbus_object_path,

2449

client.name)

2450

client_settings.clear()

2451

2452

atexit.register(cleanup)

2453

2454

for client in tcp_server.clients.itervalues():

2455

if use_dbus:

2456

# Emit D-Bus signal

2457

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2458

# Need to initiate checking of clients

2459

if client.enabled:

2460

client.init_checker()

2461

2462

tcp_server.enable()

2463

tcp_server.server_activate()

2464

2465

# Find out what port we got

2466

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

2467

if use_ipv6:

2468

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

2469

" flowinfo %d, scope_id %d"

2470

% tcp_server.socket.getsockname())

2471

else: # IPv4

2472

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

2473

% tcp_server.socket.getsockname())

2474

2475

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

2476

2477

try:

2478

# From the Avahi example code

2479

try:

2480

service.activate()

2481

except dbus.exceptions.DBusException as error:

2482

logger.critical("DBusException: %s", error)

2483

cleanup()

2484

sys.exit(1)

2485

# End of Avahi example code

2486

2487

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

2488

lambda *args, **kwargs:

2489

(tcp_server.handle_request

2490

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

2491

2492

logger.debug("Starting main loop")

2493

main_loop.run()

2494

except AvahiError as error:

2495

logger.critical("AvahiError: %s", error)

2496

cleanup()

2497

sys.exit(1)

2498

except KeyboardInterrupt:

2499

if debug:

2500

print("", file=sys.stderr)

2501

logger.debug("Server received KeyboardInterrupt")

2502

logger.debug("Server exiting")

2503

# Must run before the D-Bus bus name gets deregistered

2504

cleanup()

2505

2506

if __name__ == '__main__':

2507

main()