/mandos/trunk : revision 520

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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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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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from future_builtins import *

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import SocketServer as socketserver

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import socket

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import argparse

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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 itertools

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import collections

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import hashlib

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import dbus

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import dbus.service

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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 Crypto.Cipher.AES

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try:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.6.0"

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stored_state_file = "clients.pickle"

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version = "1.4.1"

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logger = logging.getLogger()

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stored_state_path = "/var/lib/mandos/clients.pickle"

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

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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--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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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir=self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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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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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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class AvahiError(Exception):

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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 <https://www.iana.org/assignments/service-names-port-numbers>

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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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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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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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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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logger.critical("D-Bus Exception", exc_info=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 = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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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: {0!s}"

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.format(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()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException):

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dbus.exceptions.DBusException) as e:

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pass

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self.group = None

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self.remove()

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

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

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

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

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else:

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

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def activate(self):

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

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if self.server is None:

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self.server_state_changed)

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

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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('Mandos ({0}) [%(process)d]:'

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

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.format(self.name)))

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

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

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% self.name))

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return ret

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def timedelta_to_milliseconds(td):

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def _timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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

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Attributes:

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

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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

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

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

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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, -2 means no checker completed yet.

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

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last_checker_status: integer between 0 and 255 reflecting exit status

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of last checker. -1 reflect crashed checker,

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or None.

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last_enabled: datetime.datetime(); (UTC)

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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

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

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until this client is disabled

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extended_timeout: extra long timeout when secret has been sent

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extended_timeout: extra long timeout when password has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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

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disabled, or None

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server_settings: The server_settings dict from main()

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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

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

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"last_approval_request", "last_checked_ok",

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

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

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

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approved_by_default": "True",

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"enabled": "True",

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}

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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.timeout)

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return _timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.extended_timeout)

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return _timedelta_to_milliseconds(self.extended_timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return timedelta_to_milliseconds(self.interval)

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return _timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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

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

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with exceptions for any special settings as defined above.

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

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value given the same arguments.

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"""

485

settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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client = settings[client_name] = {}

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

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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

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"enabled")

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

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.replace(" ", ""))

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if "secret" in section:

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

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elif "secfile" in section:

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

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(section["secfile"])),

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"rb") as secfile:

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

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else:

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raise TypeError("No secret or secfile for section {0}"

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.format(section))

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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return settings

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

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return _timedelta_to_milliseconds(self.approval_delay)

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

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

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

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attribute."""

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self.name = name

526

if server_settings is None:

527

server_settings = {}

528

self.server_settings = server_settings

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# adding all client settings

530

for setting, value in settings.iteritems():

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setattr(self, setting, value)

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if self.enabled:

534

if not hasattr(self, "last_enabled"):

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self.last_enabled = datetime.datetime.utcnow()

536

if not hasattr(self, "expires"):

537

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

538

+ self.timeout)

539

else:

540

self.last_enabled = None

541

self.expires = None

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if config is None:

354

config = {}

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

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356

# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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# function

359

self.fingerprint = (config["fingerprint"].upper()

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.replace(" ", ""))

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

548

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

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datetime.datetime.utcnow())

550

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# attributes specific for this server instance

362

if "secret" in config:

363

self.secret = config["secret"].decode("base64")

364

elif "secfile" in config:

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

366

(config["secfile"])),

367

"rb") as secfile:

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self.secret = secfile.read()

369

else:

370

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

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% self.name)

372

self.host = config.get("host", "")

373

self.created = datetime.datetime.utcnow()

374

self.enabled = True

375

self.last_approval_request = None

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self.last_enabled = datetime.datetime.utcnow()

377

self.last_checked_ok = None

378

self.last_checker_status = None

379

self.timeout = string_to_delta(config["timeout"])

380

self.extended_timeout = string_to_delta(config

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["extended_timeout"])

382

self.interval = string_to_delta(config["interval"])

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self.checker = None

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384

self.checker_initiator_tag = None

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385

self.disable_initiator_tag = None

386

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

555

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self.checker_callback_tag = None

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self.checker_command = config["checker"]

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self.current_checker_command = None

557

self.approved = None

390

self._approved = None

391

self.approved_by_default = config.get("approved_by_default",

392

True)

558

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self.approvals_pending = 0

394

self.approval_delay = string_to_delta(

395

config["approval_delay"])

396

self.approval_duration = string_to_delta(

397

config["approval_duration"])

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398

self.changedstate = (multiprocessing_manager

560

399

.Condition(multiprocessing_manager

561

400

.Lock()))

562

self.client_structure = [attr for attr in

563

self.__dict__.iterkeys()

564

if not attr.startswith("_")]

401

self.client_structure = [attr for attr in self.__dict__.iterkeys() if not attr.startswith("_")]

565

402

self.client_structure.append("client_structure")

566

403

404

567

405

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

568

lambda obj:

569

isinstance(obj,

570

property)):

406

lambda obj: isinstance(obj, property)):

571

407

if not name.startswith("_"):

572

408

self.client_structure.append(name)

573

409

581

417

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

582

418

# Already enabled

583

419

return

420

self.send_changedstate()

584

421

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

585

422

self.enabled = True

586

423

self.last_enabled = datetime.datetime.utcnow()

587

424

self.init_checker()

588

self.send_changedstate()

589

425

590

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def disable(self, quiet=True):

591

427

"""Disable this client."""

592

428

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

593

429

return False

594

430

if not quiet:

431

self.send_changedstate()

432

if not quiet:

595

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

596

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

434

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

597

435

gobject.source_remove(self.disable_initiator_tag)

598

436

self.disable_initiator_tag = None

599

437

self.expires = None

600

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

438

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

601

439

gobject.source_remove(self.checker_initiator_tag)

602

440

self.checker_initiator_tag = None

603

441

self.stop_checker()

604

442

self.enabled = False

605

if not quiet:

606

self.send_changedstate()

607

443

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

608

444

return False

609

445

610

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def __del__(self):

611

447

self.disable()

612

448

613

449

def init_checker(self):

614

450

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

615

451

# and every interval from then on.

616

if self.checker_initiator_tag is not None:

617

gobject.source_remove(self.checker_initiator_tag)

618

452

self.checker_initiator_tag = (gobject.timeout_add

619

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(self.interval_milliseconds(),

620

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self.start_checker))

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

622

if self.disable_initiator_tag is not None:

623

gobject.source_remove(self.disable_initiator_tag)

624

456

self.disable_initiator_tag = (gobject.timeout_add

625

457

(self.timeout_milliseconds(),

626

458

self.disable))

627

459

# Also start a new checker *right now*.

628

460

self.start_checker()

629

461

462

630

463

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

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464

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

632

465

self.checker_callback_tag = None

633

466

self.checker = None

634

467

if os.WIFEXITED(condition):

635

self.last_checker_status = os.WEXITSTATUS(condition)

468

self.last_checker_status = os.WEXITSTATUS(condition)

636

469

if self.last_checker_status == 0:

637

470

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

638

471

vars(self))

645

478

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

646

479

vars(self))

647

480

648

def checked_ok(self):

649

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

650

self.last_checked_ok = datetime.datetime.utcnow()

651

self.last_checker_status = 0

652

self.bump_timeout()

653

654

def bump_timeout(self, timeout=None):

655

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

481

def checked_ok(self, timeout=None):

482

"""Bump up the timeout for this client.

483

484

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

485

alive and well.

486

"""

656

487

if timeout is None:

657

488

timeout = self.timeout

489

self.last_checked_ok = datetime.datetime.utcnow()

658

490

if self.disable_initiator_tag is not None:

659

491

gobject.source_remove(self.disable_initiator_tag)

660

self.disable_initiator_tag = None

661

492

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

662

493

self.disable_initiator_tag = (gobject.timeout_add

663

(timedelta_to_milliseconds

494

(_timedelta_to_milliseconds

664

495

(timeout), self.disable))

665

496

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

666

497

673

504

If a checker already exists, leave it running and do

674

505

nothing."""

675

506

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

676

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

677

# slowly and taking more than 'interval' time, then the client

678

# would inevitably timeout, since no checker would get a

679

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

507

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

508

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

509

# client would inevitably timeout, since no checker would get

510

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

680

511

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

681

512

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

682

513

# should be.

696

527

self.current_checker_command)

697

528

# Start a new checker if needed

698

529

if self.checker is None:

699

# Escape attributes for the shell

700

escaped_attrs = dict(

701

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

702

for attr in

703

self.runtime_expansions)

704

530

try:

705

command = self.checker_command % escaped_attrs

706

except TypeError as error:

707

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

708

self.checker_command, exc_info=error)

709

return True # Try again later

531

# In case checker_command has exactly one % operator

532

command = self.checker_command % self.host

533

except TypeError:

534

# Escape attributes for the shell

535

escaped_attrs = dict(

536

(attr,

537

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

538

errors=

539

'replace')))

540

for attr in

541

self.runtime_expansions)

542

543

try:

544

command = self.checker_command % escaped_attrs

545

except TypeError as error:

546

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

547

' %s', self.checker_command, error)

548

return True # Try again later

710

549

self.current_checker_command = command

711

550

try:

712

551

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

715

554

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

716

555

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

717

556

# always replaced by /dev/null.)

718

# The exception is when not debugging but nevertheless

719

# running in the foreground; use the previously

720

# created wnull.

721

popen_args = {}

722

if (not self.server_settings["debug"]

723

and self.server_settings["foreground"]):

724

popen_args.update({"stdout": wnull,

725

"stderr": wnull })

726

557

self.checker = subprocess.Popen(command,

727

558

close_fds=True,

728

shell=True, cwd="/",

729

**popen_args)

730

except OSError as error:

731

logger.error("Failed to start subprocess",

732

exc_info=error)

733

return True

734

self.checker_callback_tag = (gobject.child_watch_add

735

(self.checker.pid,

736

self.checker_callback,

737

data=command))

738

# The checker may have completed before the gobject

739

# watch was added. Check for this.

740

try:

559

shell=True, cwd="/")

560

self.checker_callback_tag = (gobject.child_watch_add

561

(self.checker.pid,

562

self.checker_callback,

563

data=command))

564

# The checker may have completed before the gobject

565

# watch was added. Check for this.

741

566

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

567

if pid:

568

gobject.source_remove(self.checker_callback_tag)

569

self.checker_callback(pid, status, command)

742

570

except OSError as error:

743

if error.errno == errno.ECHILD:

744

# This should never happen

745

logger.error("Child process vanished",

746

exc_info=error)

747

return True

748

raise

749

if pid:

750

gobject.source_remove(self.checker_callback_tag)

751

self.checker_callback(pid, status, command)

571

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

572

error)

752

573

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

753

574

return True

754

575

761

582

return

762

583

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

763

584

try:

764

self.checker.terminate()

585

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

765

586

#time.sleep(0.5)

766

587

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

767

# self.checker.kill()

588

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

768

589

except OSError as error:

769

590

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

770

591

raise

771

592

self.checker = None

772

593

594

# Encrypts a client secret and stores it in a varible encrypted_secret

595

def encrypt_secret(self, key):

596

# Encryption-key need to be of a specific size, so we hash inputed key

597

hasheng = hashlib.sha256()

598

hasheng.update(key)

599

encryptionkey = hasheng.digest()

600

601

# Create validation hash so we know at decryption if it was sucessful

602

hasheng = hashlib.sha256()

603

hasheng.update(self.secret)

604

validationhash = hasheng.digest()

605

606

# Encrypt secret

607

iv = os.urandom(Crypto.Cipher.AES.block_size)

608

ciphereng = Crypto.Cipher.AES.new(encryptionkey,

609

Crypto.Cipher.AES.MODE_CFB, iv)

610

ciphertext = ciphereng.encrypt(validationhash+self.secret)

611

self.encrypted_secret = (ciphertext, iv)

612

613

# Decrypt a encrypted client secret

614

def decrypt_secret(self, key):

615

# Decryption-key need to be of a specific size, so we hash inputed key

616

hasheng = hashlib.sha256()

617

hasheng.update(key)

618

encryptionkey = hasheng.digest()

619

620

# Decrypt encrypted secret

621

ciphertext, iv = self.encrypted_secret

622

ciphereng = Crypto.Cipher.AES.new(encryptionkey,

623

Crypto.Cipher.AES.MODE_CFB, iv)

624

plain = ciphereng.decrypt(ciphertext)

625

626

# Validate decrypted secret to know if it was succesful

627

hasheng = hashlib.sha256()

628

validationhash = plain[:hasheng.digest_size]

629

secret = plain[hasheng.digest_size:]

630

hasheng.update(secret)

631

632

# if validation fails, we use key as new secret. Otherwhise, we use

633

# the decrypted secret

634

if hasheng.digest() == validationhash:

635

self.secret = secret

636

else:

637

self.secret = key

638

del self.encrypted_secret

639

773

640

774

641

def dbus_service_property(dbus_interface, signature="v",

775

642

access="readwrite", byte_arrays=False):

787

654

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

788

655

if byte_arrays and signature != "ay":

789

656

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

790

" signature {0!r}".format(signature))

657

" signature %r" % signature)

791

658

def decorator(func):

792

659

func._dbus_is_property = True

793

660

func._dbus_interface = dbus_interface

801

668

return decorator

802

669

803

670

804

def dbus_interface_annotations(dbus_interface):

805

"""Decorator for marking functions returning interface annotations

806

807

Usage:

808

809

@dbus_interface_annotations("org.example.Interface")

810

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

811

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

812

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

813

"false"}

814

"""

815

def decorator(func):

816

func._dbus_is_interface = True

817

func._dbus_interface = dbus_interface

818

func._dbus_name = dbus_interface

819

return func

820

return decorator

821

822

823

def dbus_annotations(annotations):

824

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

825

Usage:

826

827

@dbus_service_property("org.example.Interface", signature="b",

828

access="r")

829

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

830

"org.freedesktop.DBus.Property."

831

"EmitsChangedSignal": "false"})

832

def Property_dbus_property(self):

833

return dbus.Boolean(False)

834

"""

835

def decorator(func):

836

func._dbus_annotations = annotations

837

return func

838

return decorator

839

840

841

671

class DBusPropertyException(dbus.exceptions.DBusException):

842

672

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

843

673

"""

866

696

"""

867

697

868

698

@staticmethod

869

def _is_dbus_thing(thing):

870

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

871

872

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

873

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

874

"""

875

return lambda obj: getattr(obj, "_dbus_is_{0}".format(thing),

876

False)

699

def _is_dbus_property(obj):

700

return getattr(obj, "_dbus_is_property", False)

877

701

878

def _get_all_dbus_things(self, thing):

702

def _get_all_dbus_properties(self):

879

703

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

880

704

"""

881

return ((getattr(athing.__get__(self), "_dbus_name",

882

name),

883

athing.__get__(self))

705

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

884

706

for cls in self.__class__.__mro__

885

for name, athing in

886

inspect.getmembers(cls,

887

self._is_dbus_thing(thing)))

707

for name, prop in

708

inspect.getmembers(cls, self._is_dbus_property))

888

709

889

710

def _get_dbus_property(self, interface_name, property_name):

890

711

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

892

713

"""

893

714

for cls in self.__class__.__mro__:

894

715

for name, value in (inspect.getmembers

895

(cls,

896

self._is_dbus_thing("property"))):

716

(cls, self._is_dbus_property)):

897

717

if (value._dbus_name == property_name

898

718

and value._dbus_interface == interface_name):

899

719

return value.__get__(self)

928

748

# signatures other than "ay".

929

749

if prop._dbus_signature != "ay":

930

750

raise ValueError

931

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

932

for byte in value))

751

value = dbus.ByteArray(''.join(unichr(byte)

752

for byte in value))

933

753

prop(value)

934

754

935

755

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

940

760

941

761

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

942

762

"""

943

properties = {}

944

for name, prop in self._get_all_dbus_things("property"):

763

all = {}

764

for name, prop in self._get_all_dbus_properties():

945

765

if (interface_name

946

766

and interface_name != prop._dbus_interface):

947

767

# Interface non-empty but did not match

951

771

continue

952

772

value = prop()

953

773

if not hasattr(value, "variant_level"):

954

properties[name] = value

774

all[name] = value

955

775

continue

956

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

957

value.variant_level+1)

958

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

776

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

777

value.variant_level+1)

778

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

959

779

960

780

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

961

781

out_signature="s",

962

782

path_keyword='object_path',

963

783

connection_keyword='connection')

964

784

def Introspect(self, object_path, connection):

965

"""Overloading of standard D-Bus method.

966

967

Inserts property tags and interface annotation tags.

785

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

968

786

"""

969

787

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

970

788

connection)

977

795

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

978

796

return e

979

797

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

980

# Add property tags

981

798

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

982

799

for name, prop

983

in self._get_all_dbus_things("property")

800

in self._get_all_dbus_properties()

984

801

if prop._dbus_interface

985

802

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

986

803

if_tag.appendChild(tag)

987

# Add annotation tags

988

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

989

for tag in if_tag.getElementsByTagName(typ):

990

annots = dict()

991

for name, prop in (self.

992

_get_all_dbus_things(typ)):

993

if (name == tag.getAttribute("name")

994

and prop._dbus_interface

995

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

996

annots.update(getattr

997

(prop,

998

"_dbus_annotations",

999

{}))

1000

for name, value in annots.iteritems():

1001

ann_tag = document.createElement(

1002

"annotation")

1003

ann_tag.setAttribute("name", name)

1004

ann_tag.setAttribute("value", value)

1005

tag.appendChild(ann_tag)

1006

# Add interface annotation tags

1007

for annotation, value in dict(

1008

itertools.chain.from_iterable(

1009

annotations().iteritems()

1010

for name, annotations in

1011

self._get_all_dbus_things("interface")

1012

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

1013

)).iteritems():

1014

ann_tag = document.createElement("annotation")

1015

ann_tag.setAttribute("name", annotation)

1016

ann_tag.setAttribute("value", value)

1017

if_tag.appendChild(ann_tag)

1018

804

# Add the names to the return values for the

1019

805

# "org.freedesktop.DBus.Properties" methods

1020

806

if (if_tag.getAttribute("name")

1035

821

except (AttributeError, xml.dom.DOMException,

1036

822

xml.parsers.expat.ExpatError) as error:

1037

823

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

1038

exc_info=error)

824

error)

1039

825

return xmlstring

1040

826

1041

827

1042

def datetime_to_dbus(dt, variant_level=0):

828

def datetime_to_dbus (dt, variant_level=0):

1043

829

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

1044

830

if dt is None:

1045

831

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

1046

832

return dbus.String(dt.isoformat(),

1047

833

variant_level=variant_level)

1048

834

1049

1050

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1051

"""A class decorator; applied to a subclass of

1052

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

1053

interface names according to the "alt_interface_names" mapping.

1054

Usage:

1055

1056

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

1057

"net.example.AlternateInterface"})

1058

class SampleDBusObject(dbus.service.Object):

1059

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

1060

def SampleDBusMethod():

1061

pass

1062

1063

The above "SampleDBusMethod" on "SampleDBusObject" will be

1064

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

1065

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

1066

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

1067

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

1068

1069

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

1070

(from DBusObjectWithProperties) and interfaces (from the

1071

dbus_interface_annotations decorator).

835

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

836

.__metaclass__):

837

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

838

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

1072

839

"""

1073

def wrapper(cls):

1074

for orig_interface_name, alt_interface_name in (

1075

alt_interface_names.iteritems()):

1076

attr = {}

1077

interface_names = set()

1078

# Go though all attributes of the class

1079

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

840

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

841

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

842

# methods, signals, or properties in them

843

for base in (b for b in bases

844

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

845

# Go though all attributes of the base class

846

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

1080

847

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

1081

848

# with the wrong interface name

1082

849

if (not hasattr(attribute, "_dbus_interface")

1083

850

or not attribute._dbus_interface

1084

.startswith(orig_interface_name)):

851

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

1085

852

continue

1086

853

# Create an alternate D-Bus interface name based on

1087

854

# the current name

1088

855

alt_interface = (attribute._dbus_interface

1089

.replace(orig_interface_name,

1090

alt_interface_name))

1091

interface_names.add(alt_interface)

856

.replace("se.recompile.Mandos",

857

"se.bsnet.fukt.Mandos"))

1092

858

# Is this a D-Bus signal?

1093

859

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

1094

# Extract the original non-method undecorated

1095

# function by black magic

860

# Extract the original non-method function by

861

# black magic

1096

862

nonmethod_func = (dict(

1097

863

zip(attribute.func_code.co_freevars,

1098

864

attribute.__closure__))["func"]

1109

875

nonmethod_func.func_name,

1110

876

nonmethod_func.func_defaults,

1111

877

nonmethod_func.func_closure)))

1112

# Copy annotations, if any

1113

try:

1114

new_function._dbus_annotations = (

1115

dict(attribute._dbus_annotations))

1116

except AttributeError:

1117

pass

1118

878

# Define a creator of a function to call both the

1119

# original and alternate functions, so both the

1120

# original and alternate signals gets sent when

1121

# the function is called

879

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

880

# signals gets sent when the function is called

1122

881

def fixscope(func1, func2):

1123

882

"""This function is a scope container to pass

1124

883

func1 and func2 to the "call_both" function

1131

890

return call_both

1132

891

# Create the "call_both" function and add it to

1133

892

# the class

1134

attr[attrname] = fixscope(attribute, new_function)

893

attr[attrname] = fixscope(attribute,

894

new_function)

1135

895

# Is this a D-Bus method?

1136

896

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

1137

897

# Create a new, but exactly alike, function

1148

908

attribute.func_name,

1149

909

attribute.func_defaults,

1150

910

attribute.func_closure)))

1151

# Copy annotations, if any

1152

try:

1153

attr[attrname]._dbus_annotations = (

1154

dict(attribute._dbus_annotations))

1155

except AttributeError:

1156

pass

1157

911

# Is this a D-Bus property?

1158

912

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

1159

913

# Create a new, but exactly alike, function

1173

927

attribute.func_name,

1174

928

attribute.func_defaults,

1175

929

attribute.func_closure)))

1176

# Copy annotations, if any

1177

try:

1178

attr[attrname]._dbus_annotations = (

1179

dict(attribute._dbus_annotations))

1180

except AttributeError:

1181

pass

1182

# Is this a D-Bus interface?

1183

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

1184

# Create a new, but exactly alike, function

1185

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

1186

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

1187

# to the class.

1188

attr[attrname] = (dbus_interface_annotations

1189

(alt_interface)

1190

(types.FunctionType

1191

(attribute.func_code,

1192

attribute.func_globals,

1193

attribute.func_name,

1194

attribute.func_defaults,

1195

attribute.func_closure)))

1196

if deprecate:

1197

# Deprecate all alternate interfaces

1198

iname="_AlternateDBusNames_interface_annotation{0}"

1199

for interface_name in interface_names:

1200

@dbus_interface_annotations(interface_name)

1201

def func(self):

1202

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

1203

"true" }

1204

# Find an unused name

1205

for aname in (iname.format(i)

1206

for i in itertools.count()):

1207

if aname not in attr:

1208

attr[aname] = func

1209

break

1210

if interface_names:

1211

# Replace the class with a new subclass of it with

1212

# methods, signals, etc. as created above.

1213

cls = type(b"{0}Alternate".format(cls.__name__),

1214

(cls,), attr)

1215

return cls

1216

return wrapper

1217

1218

1219

@alternate_dbus_interfaces({"se.recompile.Mandos":

1220

"se.bsnet.fukt.Mandos"})

930

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

931

1221

932

class ClientDBus(Client, DBusObjectWithProperties):

1222

933

"""A Client class using D-Bus

1223

934

1234

945

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

1235

946

self.bus = bus

1236

947

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

948

949

self._approvals_pending = 0

1237

950

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

1238

951

# the D-Bus

1239

952

client_object_name = unicode(self.name).translate(

1243

956

("/clients/" + client_object_name))

1244

957

DBusObjectWithProperties.__init__(self, self.bus,

1245

958

self.dbus_object_path)

1246

959

1247

960

def notifychangeproperty(transform_func,

1248

961

dbus_name, type_func=lambda x: x,

1249

962

variant_level=1):

1250

963

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

1251

964

its changes to DBus.

1252

965

1253

966

transform_fun: Function that takes a value and a variant_level

1254

967

and transforms it to a D-Bus type.

1255

968

dbus_name: D-Bus name of the variable

1272

985

1273

986

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

1274

987

988

1275

989

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1276

990

approvals_pending = notifychangeproperty(dbus.Boolean,

1277

991

"ApprovalPending",

1284

998

checker is not None)

1285

999

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1286

1000

"LastCheckedOK")

1287

last_checker_status = notifychangeproperty(dbus.Int16,

1288

"LastCheckerStatus")

1289

1001

last_approval_request = notifychangeproperty(

1290

1002

datetime_to_dbus, "LastApprovalRequest")

1291

1003

approved_by_default = notifychangeproperty(dbus.Boolean,

1292

1004

"ApprovedByDefault")

1293

approval_delay = notifychangeproperty(dbus.UInt64,

1005

approval_delay = notifychangeproperty(dbus.UInt16,

1294

1006

"ApprovalDelay",

1295

1007

type_func =

1296

timedelta_to_milliseconds)

1008

_timedelta_to_milliseconds)

1297

1009

approval_duration = notifychangeproperty(

1298

dbus.UInt64, "ApprovalDuration",

1299

type_func = timedelta_to_milliseconds)

1010

dbus.UInt16, "ApprovalDuration",

1011

type_func = _timedelta_to_milliseconds)

1300

1012

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

1301

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

1013

timeout = notifychangeproperty(dbus.UInt16, "Timeout",

1302

1014

type_func =

1303

timedelta_to_milliseconds)

1015

_timedelta_to_milliseconds)

1304

1016

extended_timeout = notifychangeproperty(

1305

dbus.UInt64, "ExtendedTimeout",

1306

type_func = timedelta_to_milliseconds)

1307

interval = notifychangeproperty(dbus.UInt64,

1017

dbus.UInt16, "ExtendedTimeout",

1018

type_func = _timedelta_to_milliseconds)

1019

interval = notifychangeproperty(dbus.UInt16,

1308

1020

"Interval",

1309

1021

type_func =

1310

timedelta_to_milliseconds)

1022

_timedelta_to_milliseconds)

1311

1023

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

1312

1024

1313

1025

del notifychangeproperty

1355

1067

return r

1356

1068

1357

1069

def _reset_approved(self):

1358

self.approved = None

1070

self._approved = None

1359

1071

return False

1360

1072

1361

1073

def approve(self, value=True):

1362

self.approved = value

1363

gobject.timeout_add(timedelta_to_milliseconds

1074

self.send_changedstate()

1075

self._approved = value

1076

gobject.timeout_add(_timedelta_to_milliseconds

1364

1077

(self.approval_duration),

1365

1078

self._reset_approved)

1366

self.send_changedstate()

1079

1367

1080

1368

1081

## D-Bus methods, signals & properties

1369

1082

_interface = "se.recompile.Mandos.Client"

1370

1083

1371

## Interfaces

1372

1373

@dbus_interface_annotations(_interface)

1374

def _foo(self):

1375

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

1376

"false"}

1377

1378

1084

## Signals

1379

1085

1380

1086

# CheckerCompleted - signal

1479

1185

access="readwrite")

1480

1186

def ApprovalDuration_dbus_property(self, value=None):

1481

1187

if value is None: # get

1482

return dbus.UInt64(timedelta_to_milliseconds(

1188

return dbus.UInt64(_timedelta_to_milliseconds(

1483

1189

self.approval_duration))

1484

1190

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

1485

1191

1499

1205

def Host_dbus_property(self, value=None):

1500

1206

if value is None: # get

1501

1207

return dbus.String(self.host)

1502

self.host = unicode(value)

1208

self.host = value

1503

1209

1504

1210

# Created - property

1505

1211

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

1506

1212

def Created_dbus_property(self):

1507

return datetime_to_dbus(self.created)

1213

return dbus.String(datetime_to_dbus(self.created))

1508

1214

1509

1215

# LastEnabled - property

1510

1216

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

1531

1237

return

1532

1238

return datetime_to_dbus(self.last_checked_ok)

1533

1239

1534

# LastCheckerStatus - property

1535

@dbus_service_property(_interface, signature="n",

1536

access="read")

1537

def LastCheckerStatus_dbus_property(self):

1538

return dbus.Int16(self.last_checker_status)

1539

1540

1240

# Expires - property

1541

1241

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

1542

1242

def Expires_dbus_property(self):

1553

1253

def Timeout_dbus_property(self, value=None):

1554

1254

if value is None: # get

1555

1255

return dbus.UInt64(self.timeout_milliseconds())

1556

old_timeout = self.timeout

1557

1256

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

1558

# Reschedule disabling

1559

if self.enabled:

1560

now = datetime.datetime.utcnow()

1561

self.expires += self.timeout - old_timeout

1562

if self.expires <= now:

1563

# The timeout has passed

1564

self.disable()

1565

else:

1566

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

1567

is None):

1568

return

1569

gobject.source_remove(self.disable_initiator_tag)

1570

self.disable_initiator_tag = (

1571

gobject.timeout_add(

1572

timedelta_to_milliseconds(self.expires - now),

1573

self.disable))

1257

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

1258

return

1259

# Reschedule timeout

1260

gobject.source_remove(self.disable_initiator_tag)

1261

self.disable_initiator_tag = None

1262

self.expires = None

1263

time_to_die = _timedelta_to_milliseconds((self

1264

.last_checked_ok

1265

+ self.timeout)

1266

- datetime.datetime

1267

.utcnow())

1268

if time_to_die <= 0:

1269

# The timeout has passed

1270

self.disable()

1271

else:

1272

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

1273

+ datetime.timedelta(milliseconds =

1274

time_to_die))

1275

self.disable_initiator_tag = (gobject.timeout_add

1276

(time_to_die, self.disable))

1574

1277

1575

1278

# ExtendedTimeout - property

1576

1279

@dbus_service_property(_interface, signature="t",

1589

1292

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

1590

1293

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

1591

1294

return

1592

if self.enabled:

1593

# Reschedule checker run

1594

gobject.source_remove(self.checker_initiator_tag)

1595

self.checker_initiator_tag = (gobject.timeout_add

1596

(value, self.start_checker))

1597

self.start_checker() # Start one now, too

1295

# Reschedule checker run

1296

gobject.source_remove(self.checker_initiator_tag)

1297

self.checker_initiator_tag = (gobject.timeout_add

1298

(value, self.start_checker))

1299

self.start_checker() # Start one now, too

1598

1300

1599

1301

# Checker - property

1600

1302

@dbus_service_property(_interface, signature="s",

1602

1304

def Checker_dbus_property(self, value=None):

1603

1305

if value is None: # get

1604

1306

return dbus.String(self.checker_command)

1605

self.checker_command = unicode(value)

1307

self.checker_command = value

1606

1308

1607

1309

# CheckerRunning - property

1608

1310

@dbus_service_property(_interface, signature="b",

1637

1339

raise KeyError()

1638

1340

1639

1341

def __getattribute__(self, name):

1640

if name == '_pipe':

1342

if(name == '_pipe'):

1641

1343

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

1642

1344

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

1643

1345

data = self._pipe.recv()

1650

1352

return func

1651

1353

1652

1354

def __setattr__(self, name, value):

1653

if name == '_pipe':

1355

if(name == '_pipe'):

1654

1356

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

1655

1357

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

1656

1358

1359

class ClientDBusTransitional(ClientDBus):

1360

__metaclass__ = AlternateDBusNamesMetaclass

1657

1361

1658

1362

class ClientHandler(socketserver.BaseRequestHandler, object):

1659

1363

"""A class to handle client connections.

1742

1446

client.Rejected("Disabled")

1743

1447

return

1744

1448

1745

if client.approved or not client.approval_delay:

1449

if client._approved or not client.approval_delay:

1746

1450

#We are approved or approval is disabled

1747

1451

break

1748

elif client.approved is None:

1452

elif client._approved is None:

1749

1453

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

1750

1454

client.name)

1751

1455

if self.server.use_dbus:

1764

1468

#wait until timeout or approved

1765

1469

time = datetime.datetime.now()

1766

1470

client.changedstate.acquire()

1767

client.changedstate.wait(

1768

float(timedelta_to_milliseconds(delay)

1769

/ 1000))

1471

(client.changedstate.wait

1472

(float(client._timedelta_to_milliseconds(delay)

1473

/ 1000)))

1770

1474

client.changedstate.release()

1771

1475

time2 = datetime.datetime.now()

1772

1476

if (time2 - time) >= delay:

1788

1492

try:

1789

1493

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

1790

1494

except gnutls.errors.GNUTLSError as error:

1791

logger.warning("gnutls send failed",

1792

exc_info=error)

1495

logger.warning("gnutls send failed")

1793

1496

return

1794

1497

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

1795

1498

sent, len(client.secret)

1798

1501

1799

1502

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

1800

1503

# bump the timeout using extended_timeout

1801

client.bump_timeout(client.extended_timeout)

1504

client.checked_ok(client.extended_timeout)

1802

1505

if self.server.use_dbus:

1803

1506

# Emit D-Bus signal

1804

1507

client.GotSecret()

1809

1512

try:

1810

1513

session.bye()

1811

1514

except gnutls.errors.GNUTLSError as error:

1812

logger.warning("GnuTLS bye failed",

1813

exc_info=error)

1515

logger.warning("GnuTLS bye failed")

1814

1516

1815

1517

@staticmethod

1816

1518

def peer_certificate(session):

1872

1574

# Convert the buffer to a Python bytestring

1873

1575

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

1874

1576

# Convert the bytestring to hexadecimal notation

1875

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

1577

hex_fpr = ''.join("%02X" % ord(char) for char in fpr)

1876

1578

return hex_fpr

1877

1579

1878

1580

1881

1583

def sub_process_main(self, request, address):

1882

1584

try:

1883

1585

self.finish_request(request, address)

1884

except Exception:

1586

except:

1885

1587

self.handle_error(request, address)

1886

1588

self.close_request(request)

1887

1589

1888

1590

def process_request(self, request, address):

1889

1591

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

1890

1592

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

1891

args = (request, address))

1593

args = (request,

1594

address))

1892

1595

proc.start()

1893

1596

return proc

1894

1597

1922

1625

use_ipv6: Boolean; to use IPv6 or not

1923

1626

"""

1924

1627

def __init__(self, server_address, RequestHandlerClass,

1925

interface=None, use_ipv6=True, socketfd=None):

1926

"""If socketfd is set, use that file descriptor instead of

1927

creating a new one with socket.socket().

1928

"""

1628

interface=None, use_ipv6=True):

1929

1629

self.interface = interface

1930

1630

if use_ipv6:

1931

1631

self.address_family = socket.AF_INET6

1932

if socketfd is not None:

1933

# Save the file descriptor

1934

self.socketfd = socketfd

1935

# Save the original socket.socket() function

1936

self.socket_socket = socket.socket

1937

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

1938

#

1939

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

1940

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

1941

# patching socket.socket.)

1942

#

1943

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

1944

@functools.wraps(socket.socket)

1945

def socket_wrapper(*args, **kwargs):

1946

# Restore original function so subsequent calls are

1947

# not affected.

1948

socket.socket = self.socket_socket

1949

del self.socket_socket

1950

# This time only, return a new socket object from the

1951

# saved file descriptor.

1952

return socket.fromfd(self.socketfd, *args, **kwargs)

1953

# Replace socket.socket() function with wrapper

1954

socket.socket = socket_wrapper

1955

# The socketserver.TCPServer.__init__ will call

1956

# socket.socket(), which might be our replacement,

1957

# socket_wrapper(), if socketfd was set.

1958

1632

socketserver.TCPServer.__init__(self, server_address,

1959

1633

RequestHandlerClass)

1960

1961

1634

def server_bind(self):

1962

1635

"""This overrides the normal server_bind() function

1963

1636

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

1971

1644

try:

1972

1645

self.socket.setsockopt(socket.SOL_SOCKET,

1973

1646

SO_BINDTODEVICE,

1974

str(self.interface + '\0'))

1647

str(self.interface

1648

+ '\0'))

1975

1649

except socket.error as error:

1976

if error.errno == errno.EPERM:

1977

logger.error("No permission to bind to"

1978

" interface %s", self.interface)

1979

elif error.errno == errno.ENOPROTOOPT:

1650

if error[0] == errno.EPERM:

1651

logger.error("No permission to"

1652

" bind to interface %s",

1653

self.interface)

1654

elif error[0] == errno.ENOPROTOOPT:

1980

1655

logger.error("SO_BINDTODEVICE not available;"

1981

1656

" cannot bind to interface %s",

1982

1657

self.interface)

1983

elif error.errno == errno.ENODEV:

1984

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

1985

" cannot bind", self.interface)

1986

1658

else:

1987

1659

raise

1988

1660

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

1991

1663

if self.address_family == socket.AF_INET6:

1992

1664

any_address = "::" # in6addr_any

1993

1665

else:

1994

any_address = "0.0.0.0" # INADDR_ANY

1666

any_address = socket.INADDR_ANY

1995

1667

self.server_address = (any_address,

1996

1668

self.server_address[1])

1997

1669

elif not self.server_address[1]:

2018

1690

"""

2019

1691

def __init__(self, server_address, RequestHandlerClass,

2020

1692

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

2021

gnutls_priority=None, use_dbus=True, socketfd=None):

1693

gnutls_priority=None, use_dbus=True):

2022

1694

self.enabled = False

2023

1695

self.clients = clients

2024

1696

if self.clients is None:

2028

1700

IPv6_TCPServer.__init__(self, server_address,

2029

1701

RequestHandlerClass,

2030

1702

interface = interface,

2031

use_ipv6 = use_ipv6,

2032

socketfd = socketfd)

1703

use_ipv6 = use_ipv6)

2033

1704

def server_activate(self):

2034

1705

if self.enabled:

2035

1706

return socketserver.TCPServer.server_activate(self)

2048

1719

2049

1720

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

2050

1721

proc = None, client_object=None):

1722

condition_names = {

1723

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

1724

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

1725

# blocking).

1726

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

1727

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

1728

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

1729

# broken, usually for pipes and

1730

# sockets).

1731

}

1732

conditions_string = ' | '.join(name

1733

for cond, name in

1734

condition_names.iteritems()

1735

if cond & condition)

2051

1736

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

2052

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

1737

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

2053

1738

# Wait for other process to exit

2054

1739

proc.join()

2055

1740

return False

2113

1798

return True

2114

1799

2115

1800

2116

def rfc3339_duration_to_delta(duration):

2117

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

2118

2119

>>> rfc3339_duration_to_delta("P7D")

2120

datetime.timedelta(7)

2121

>>> rfc3339_duration_to_delta("PT60S")

2122

datetime.timedelta(0, 60)

2123

>>> rfc3339_duration_to_delta("PT60M")

2124

datetime.timedelta(0, 3600)

2125

>>> rfc3339_duration_to_delta("PT24H")

2126

datetime.timedelta(1)

2127

>>> rfc3339_duration_to_delta("P1W")

2128

datetime.timedelta(7)

2129

>>> rfc3339_duration_to_delta("PT5M30S")

2130

datetime.timedelta(0, 330)

2131

>>> rfc3339_duration_to_delta("P1DT3M20S")

2132

datetime.timedelta(1, 200)

2133

"""

2134

2135

# Parsing an RFC 3339 duration with regular expressions is not

2136

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

2137

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

2138

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

2139

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

2140

# avoid excessive use of external libraries.

2141

2142

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

2143

Token = collections.namedtuple("Token",

2144

("regexp", # To match token; if

2145

# "value" is not None,

2146

# must have a "group"

2147

# containing digits

2148

"value", # datetime.timedelta or

2149

# None

2150

"followers")) # Tokens valid after

2151

# this token

2152

# RFC 3339 "duration" tokens, syntax, and semantics; taken from

2153

# the "duration" ABNF definition in RFC 3339, Appendix A.

2154

token_end = Token(re.compile(r"$"), None, frozenset())

2155

token_second = Token(re.compile(r"(\d+)S"),

2156

datetime.timedelta(seconds=1),

2157

frozenset((token_end,)))

2158

token_minute = Token(re.compile(r"(\d+)M"),

2159

datetime.timedelta(minutes=1),

2160

frozenset((token_second, token_end)))

2161

token_hour = Token(re.compile(r"(\d+)H"),

2162

datetime.timedelta(hours=1),

2163

frozenset((token_minute, token_end)))

2164

token_time = Token(re.compile(r"T"),

2165

None,

2166

frozenset((token_hour, token_minute,

2167

token_second)))

2168

token_day = Token(re.compile(r"(\d+)D"),

2169

datetime.timedelta(days=1),

2170

frozenset((token_time, token_end)))

2171

token_month = Token(re.compile(r"(\d+)M"),

2172

datetime.timedelta(weeks=4),

2173

frozenset((token_day, token_end)))

2174

token_year = Token(re.compile(r"(\d+)Y"),

2175

datetime.timedelta(weeks=52),

2176

frozenset((token_month, token_end)))

2177

token_week = Token(re.compile(r"(\d+)W"),

2178

datetime.timedelta(weeks=1),

2179

frozenset((token_end,)))

2180

token_duration = Token(re.compile(r"P"), None,

2181

frozenset((token_year, token_month,

2182

token_day, token_time,

2183

token_week))),

2184

# Define starting values

2185

value = datetime.timedelta() # Value so far

2186

found_token = None

2187

followers = frozenset(token_duration,) # Following valid tokens

2188

s = duration # String left to parse

2189

# Loop until end token is found

2190

while found_token is not token_end:

2191

# Search for any currently valid tokens

2192

for token in followers:

2193

match = token.regexp.match(s)

2194

if match is not None:

2195

# Token found

2196

if token.value is not None:

2197

# Value found, parse digits

2198

factor = int(match.group(1), 10)

2199

# Add to value so far

2200

value += factor * token.value

2201

# Strip token from string

2202

s = token.regexp.sub("", s, 1)

2203

# Go to found token

2204

found_token = token

2205

# Set valid next tokens

2206

followers = found_token.followers

2207

break

2208

else:

2209

# No currently valid tokens were found

2210

raise ValueError("Invalid RFC 3339 duration")

2211

# End token found

2212

return value

2213

2214

2215

1801

def string_to_delta(interval):

2216

1802

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

2217

1803

2228

1814

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

2229

1815

datetime.timedelta(0, 330)

2230

1816

"""

2231

2232

try:

2233

return rfc3339_duration_to_delta(interval)

2234

except ValueError:

2235

pass

2236

2237

1817

timevalue = datetime.timedelta(0)

2238

1818

for s in interval.split():

2239

1819

try:

2250

1830

elif suffix == "w":

2251

1831

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

2252

1832

else:

2253

raise ValueError("Unknown suffix {0!r}"

2254

.format(suffix))

1833

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

2255

1834

except (ValueError, IndexError) as e:

2256

1835

raise ValueError(*(e.args))

2257

1836

timevalue += delta

2258

1837

return timevalue

2259

1838

2260

1839

1840

def if_nametoindex(interface):

1841

"""Call the C function if_nametoindex(), or equivalent

1842

1843

Note: This function cannot accept a unicode string."""

1844

global if_nametoindex

1845

try:

1846

if_nametoindex = (ctypes.cdll.LoadLibrary

1847

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

1848

.if_nametoindex)

1849

except (OSError, AttributeError):

1850

logger.warning("Doing if_nametoindex the hard way")

1851

def if_nametoindex(interface):

1852

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

1853

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

1854

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

1855

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1856

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

1857

interface))

1858

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

1859

ifreq[16:20])[0]

1860

return interface_index

1861

return if_nametoindex(interface)

1862

1863

2261

1864

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

2262

1865

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

2263

1866

2271

1874

sys.exit()

2272

1875

if not noclose:

2273

1876

# Close all standard open file descriptors

2274

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

1877

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

2275

1878

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

2276

1879

raise OSError(errno.ENODEV,

2277

"{0} not a character device"

2278

.format(os.devnull))

1880

"%s not a character device"

1881

% os.path.devnull)

2279

1882

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

2280

1883

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

2281

1884

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

2290

1893

2291

1894

parser = argparse.ArgumentParser()

2292

1895

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

2293

version = "%(prog)s {0}".format(version),

1896

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

2294

1897

help="show version number and exit")

2295

1898

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

2296

1899

help="Bind to interface IF")

2302

1905

help="Run self-test")

2303

1906

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

2304

1907

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

2305

" to terminal", default=None)

1908

" to terminal")

2306

1909

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

2307

1910

help="Debug level for stdout output")

2308

1911

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

2315

1918

" files")

2316

1919

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

2317

1920

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

2318

" system bus interface", default=None)

1921

" system bus interface")

2319

1922

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

2320

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

2321

default=None)

1923

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

2322

1924

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

2323

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

2324

" state", default=None)

2325

parser.add_argument("--socket", type=int,

2326

help="Specify a file descriptor to a network"

2327

" socket to use instead of creating one")

2328

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

2329

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

2330

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

2331

help="Run in foreground", default=None)

2332

1925

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

1926

default=True)

1927

2333

1928

options = parser.parse_args()

2334

1929

2335

1930

if options.check:

2343

1938

"port": "",

2344

1939

"debug": "False",

2345

1940

"priority":

2346

"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:+SIGN-RSA-SHA224",

1941

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

2347

1942

"servicename": "Mandos",

2348

1943

"use_dbus": "True",

2349

1944

"use_ipv6": "True",

2350

1945

"debuglevel": "",

2351

"restore": "True",

2352

"socket": "",

2353

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

2354

"foreground": "False",

2355

1946

}

2356

1947

2357

1948

# Parse config file for server-global settings

2362

1953

# Convert the SafeConfigParser object to a dict

2363

1954

server_settings = server_config.defaults()

2364

1955

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

2365

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

1956

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

2366

1957

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

2367

1958

option)

2368

1959

if server_settings["port"]:

2369

1960

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

2370

1961

"port")

2371

if server_settings["socket"]:

2372

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

2373

"socket")

2374

# Later, stdin will, and stdout and stderr might, be dup'ed

2375

# over with an opened os.devnull. But we don't want this to

2376

# happen with a supplied network socket.

2377

if 0 <= server_settings["socket"] <= 2:

2378

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

2379

["socket"])

2380

1962

del server_config

2381

1963

2382

1964

# Override the settings from the config file with command line

2383

1965

# options, if set.

2384

1966

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

2385

1967

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

2386

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

2387

"statedir", "socket", "foreground"):

1968

"use_dbus", "use_ipv6", "debuglevel", "restore"):

2388

1969

value = getattr(options, option)

2389

1970

if value is not None:

2390

1971

server_settings[option] = value

2393

1974

for option in server_settings.keys():

2394

1975

if type(server_settings[option]) is str:

2395

1976

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

2396

# Force all boolean options to be boolean

2397

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

2398

"foreground"):

2399

server_settings[option] = bool(server_settings[option])

2400

# Debug implies foreground

2401

if server_settings["debug"]:

2402

server_settings["foreground"] = True

2403

1977

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

2404

1978

2405

1979

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

2409

1983

debuglevel = server_settings["debuglevel"]

2410

1984

use_dbus = server_settings["use_dbus"]

2411

1985

use_ipv6 = server_settings["use_ipv6"]

2412

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

2413

stored_state_file)

2414

foreground = server_settings["foreground"]

2415

2416

if debug:

2417

initlogger(debug, logging.DEBUG)

2418

else:

2419

if not debuglevel:

2420

initlogger(debug)

2421

else:

2422

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

2423

initlogger(debug, level)

2424

1986

2425

1987

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

2426

1988

syslogger.setFormatter(logging.Formatter

2427

('Mandos ({0}) [%(process)d]:'

2428

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

2429

.format(server_settings

2430

["servicename"])))

1989

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

1990

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

1991

% server_settings["servicename"]))

2431

1992

2432

1993

# Parse config file with clients

2433

client_config = configparser.SafeConfigParser(Client

2434

.client_defaults)

1994

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

1995

"extended_timeout": "15m",

1996

"interval": "2m",

1997

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

1998

"host": "",

1999

"approval_delay": "0s",

2000

"approval_duration": "1s",

2001

}

2002

client_config = configparser.SafeConfigParser(client_defaults)

2435

2003

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

2436

2004

"clients.conf"))

2437

2005

2446

2014

use_ipv6=use_ipv6,

2447

2015

gnutls_priority=

2448

2016

server_settings["priority"],

2449

use_dbus=use_dbus,

2450

socketfd=(server_settings["socket"]

2451

or None))

2452

if not foreground:

2017

use_dbus=use_dbus)

2018

if not debug:

2453

2019

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

2454

pidfile = None

2455

2020

try:

2456

2021

pidfile = open(pidfilename, "w")

2457

except IOError as e:

2458

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

2459

exc_info=e)

2022

except IOError:

2023

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

2460

2024

2461

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

2025

try:

2026

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

2027

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

2028

except KeyError:

2462

2029

try:

2463

uid = pwd.getpwnam(name).pw_uid

2464

gid = pwd.getpwnam(name).pw_gid

2465

break

2030

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

2031

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

2466

2032

except KeyError:

2467

continue

2468

else:

2469

uid = 65534

2470

gid = 65534

2033

try:

2034

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

2035

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

2036

except KeyError:

2037

uid = 65534

2038

gid = 65534

2471

2039

try:

2472

2040

os.setgid(gid)

2473

2041

os.setuid(uid)

2474

2042

except OSError as error:

2475

if error.errno != errno.EPERM:

2043

if error[0] != errno.EPERM:

2476

2044

raise error

2477

2045

2046

if not debug and not debuglevel:

2047

logger.setLevel(logging.WARNING)

2048

if debuglevel:

2049

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

2050

logger.setLevel(level)

2051

2478

2052

if debug:

2053

logger.setLevel(logging.DEBUG)

2479

2054

# Enable all possible GnuTLS debugging

2480

2055

2481

2056

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

2490

2065

.gnutls_global_set_log_function(debug_gnutls))

2491

2066

2492

2067

# Redirect stdin so all checkers get /dev/null

2493

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

2068

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

2494

2069

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

2495

2070

if null > 2:

2496

2071

os.close(null)

2072

else:

2073

# No console logging

2074

logger.removeHandler(console)

2497

2075

2498

2076

# Need to fork before connecting to D-Bus

2499

if not foreground:

2077

if not debug:

2500

2078

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

2501

2079

daemon()

2502

2080

2503

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

2504

# need to inform gobject that threads will be used.

2505

gobject.threads_init()

2506

2507

2081

global main_loop

2508

2082

# From the Avahi example code

2509

DBusGMainLoop(set_as_default=True)

2083

DBusGMainLoop(set_as_default=True )

2510

2084

main_loop = gobject.MainLoop()

2511

2085

bus = dbus.SystemBus()

2512

2086

# End of Avahi example code

2518

2092

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

2519

2093

do_not_queue=True))

2520

2094

except dbus.exceptions.NameExistsException as e:

2521

logger.error("Disabling D-Bus:", exc_info=e)

2095

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

2522

2096

use_dbus = False

2523

2097

server_settings["use_dbus"] = False

2524

2098

tcp_server.use_dbus = False

2536

2110

2537

2111

client_class = Client

2538

2112

if use_dbus:

2539

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

2540

2541

client_settings = Client.config_parser(client_config)

2113

client_class = functools.partial(ClientDBusTransitional,

2114

bus = bus)

2115

2116

special_settings = {

2117

# Some settings need to be accessd by special methods;

2118

# booleans need .getboolean(), etc. Here is a list of them:

2119

"approved_by_default":

2120

lambda section:

2121

client_config.getboolean(section, "approved_by_default"),

2122

}

2123

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

2124

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

2125

# with exceptions for any special settings as defined above

2126

client_settings = dict((clientname,

2127

dict((setting,

2128

(value if setting not in special_settings

2129

else special_settings[setting](clientname)))

2130

for setting, value in client_config.items(clientname)))

2131

for clientname in client_config.sections())

2132

2542

2133

old_client_settings = {}

2543

clients_data = {}

2544

2545

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

2546

global wnull

2547

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

2548

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

2549

# mode

2550

if debug or not foreground:

2551

wnull.close()

2552

2553

# Get client data and settings from last running state.

2134

clients_data = []

2135

2136

# Get client data and settings from last running state.

2554

2137

if server_settings["restore"]:

2555

2138

try:

2556

2139

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

2557

clients_data, old_client_settings = (pickle.load

2558

(stored_state))

2140

clients_data, old_client_settings = pickle.load(stored_state)

2559

2141

os.remove(stored_state_path)

2560

2142

except IOError as e:

2561

if e.errno == errno.ENOENT:

2562

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

2563

.format(os.strerror(e.errno)))

2564

else:

2565

logger.critical("Could not load persistent state:",

2566

exc_info=e)

2143

logger.warning("Could not load persistant state: {0}".format(e))

2144

if e.errno != errno.ENOENT:

2567

2145

raise

2568

except EOFError as e:

2569

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

2570

"EOFError:", exc_info=e)

2571

2572

with PGPEngine() as pgp:

2573

for client_name, client in clients_data.iteritems():

2574

# Skip removed clients

2575

if client_name not in client_settings:

2576

continue

2577

2578

# Decide which value to use after restoring saved state.

2579

# We have three different values: Old config file,

2580

# new config file, and saved state.

2581

# New config value takes precedence if it differs from old

2582

# config value, otherwise use saved state.

2583

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

2584

try:

2585

# For each value in new config, check if it

2586

# differs from the old config value (Except for

2587

# the "secret" attribute)

2588

if (name != "secret" and

2589

value != old_client_settings[client_name]

2590

[name]):

2591

client[name] = value

2592

except KeyError:

2593

pass

2594

2595

# Clients who has passed its expire date can still be

2596

# enabled if its last checker was successful. Clients

2597

# whose checker succeeded before we stored its state is

2598

# assumed to have successfully run all checkers during

2599

# downtime.

2600

if client["enabled"]:

2601

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

2602

if not client["last_checked_ok"]:

2603

logger.warning(

2604

"disabling client {0} - Client never "

2605

"performed a successful checker"

2606

.format(client_name))

2607

client["enabled"] = False

2608

elif client["last_checker_status"] != 0:

2609

logger.warning(

2610

"disabling client {0} - Client "

2611

"last checker failed with error code {1}"

2612

.format(client_name,

2613

client["last_checker_status"]))

2614

client["enabled"] = False

2615

else:

2616

client["expires"] = (datetime.datetime

2617

.utcnow()

2618

+ client["timeout"])

2619

logger.debug("Last checker succeeded,"

2620

" keeping {0} enabled"

2621

.format(client_name))

2146

2147

for client in clients_data:

2148

client_name = client["name"]

2149

2150

# Decide which value to use after restoring saved state.

2151

# We have three different values: Old config file,

2152

# new config file, and saved state.

2153

# New config value takes precedence if it differs from old

2154

# config value, otherwise use saved state.

2155

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

2622

2156

try:

2623

client["secret"] = (

2624

pgp.decrypt(client["encrypted_secret"],

2625

client_settings[client_name]

2626

["secret"]))

2627

except PGPError:

2628

# If decryption fails, we use secret from new settings

2629

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

2630

.format(client_name))

2631

client["secret"] = (

2632

client_settings[client_name]["secret"])

2633

2634

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

2635

for client_name in (set(old_client_settings)

2636

- set(client_settings)):

2637

del clients_data[client_name]

2638

for client_name in (set(client_settings)

2639

- set(old_client_settings)):

2640

clients_data[client_name] = client_settings[client_name]

2641

2642

# Create all client objects

2643

for client_name, client in clients_data.iteritems():

2644

tcp_server.clients[client_name] = client_class(

2645

name = client_name, settings = client,

2646

server_settings = server_settings)

2647

2157

# For each value in new config, check if it differs

2158

# from the old config value (Except for the "secret"

2159

# attribute)

2160

if name != "secret" and value != old_client_settings[client_name][name]:

2161

setattr(client, name, value)

2162

except KeyError:

2163

pass

2164

2165

# Clients who has passed its expire date, can still be enabled if its

2166

# last checker was sucessful. Clients who checkers failed before we

2167

# stored it state is asumed to had failed checker during downtime.

2168

if client["enabled"] and client["last_checked_ok"]:

2169

if ((datetime.datetime.utcnow() - client["last_checked_ok"])

2170

> client["interval"]):

2171

if client["last_checker_status"] != 0:

2172

client["enabled"] = False

2173

else:

2174

client["expires"] = datetime.datetime.utcnow() + client["timeout"]

2175

2176

client["changedstate"] = (multiprocessing_manager

2177

.Condition(multiprocessing_manager

2178

.Lock()))

2179

if use_dbus:

2180

new_client = ClientDBusTransitional.__new__(ClientDBusTransitional)

2181

tcp_server.clients[client_name] = new_client

2182

new_client.bus = bus

2183

for name, value in client.iteritems():

2184

setattr(new_client, name, value)

2185

client_object_name = unicode(client_name).translate(

2186

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

2187

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

2188

new_client.dbus_object_path = (dbus.ObjectPath

2189

("/clients/" + client_object_name))

2190

DBusObjectWithProperties.__init__(new_client,

2191

new_client.bus,

2192

new_client.dbus_object_path)

2193

else:

2194

tcp_server.clients[client_name] = Client.__new__(Client)

2195

for name, value in client.iteritems():

2196

setattr(tcp_server.clients[client_name], name, value)

2197

2198

tcp_server.clients[client_name].decrypt_secret(

2199

client_settings[client_name]["secret"])

2200

2201

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

2202

for clientname in set(old_client_settings) - set(client_settings):

2203

del tcp_server.clients[clientname]

2204

for clientname in set(client_settings) - set(old_client_settings):

2205

tcp_server.clients[clientname] = (client_class(name = clientname,

2206

config =

2207

client_settings

2208

[clientname]))

2209

2210

2648

2211

if not tcp_server.clients:

2649

2212

logger.warning("No clients defined")

2650

2651

if not foreground:

2652

if pidfile is not None:

2653

try:

2654

with pidfile:

2655

pid = os.getpid()

2656

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

2657

except IOError:

2658

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

2659

pidfilename, pid)

2660

del pidfile

2213

2214

if not debug:

2215

try:

2216

with pidfile:

2217

pid = os.getpid()

2218

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

2219

del pidfile

2220

except IOError:

2221

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

2222

pidfilename, pid)

2223

except NameError:

2224

# "pidfile" was never created

2225

pass

2661

2226

del pidfilename

2227

2228

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

2662

2229

2663

2230

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

2664

2231

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

2665

2232

2666

2233

if use_dbus:

2667

@alternate_dbus_interfaces({"se.recompile.Mandos":

2668

"se.bsnet.fukt.Mandos"})

2669

class MandosDBusService(DBusObjectWithProperties):

2234

class MandosDBusService(dbus.service.Object):

2670

2235

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

2671

2236

def __init__(self):

2672

2237

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

2673

2238

_interface = "se.recompile.Mandos"

2674

2239

2675

@dbus_interface_annotations(_interface)

2676

def _foo(self):

2677

return { "org.freedesktop.DBus.Property"

2678

".EmitsChangedSignal":

2679

"false"}

2680

2681

2240

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

2682

2241

def ClientAdded(self, objpath):

2683

2242

"D-Bus signal"

2725

2284

2726

2285

del _interface

2727

2286

2728

mandos_dbus_service = MandosDBusService()

2287

class MandosDBusServiceTransitional(MandosDBusService):

2288

__metaclass__ = AlternateDBusNamesMetaclass

2289

mandos_dbus_service = MandosDBusServiceTransitional()

2729

2290

2730

2291

def cleanup():

2731

2292

"Cleanup function; run on exit"

2732

2293

service.cleanup()

2733

2294

2734

2295

multiprocessing.active_children()

2735

wnull.close()

2736

2296

if not (tcp_server.clients or client_settings):

2737

2297

return

2738

2739

# Store client before exiting. Secrets are encrypted with key

2740

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

2741

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

2742

clients = {}

2743

with PGPEngine() as pgp:

2744

for client in tcp_server.clients.itervalues():

2745

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

2746

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

2747

key)

2748

client_dict = {}

2749

2750

# A list of attributes that can not be pickled

2751

# + secret.

2752

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

2753

"checker", "server_settings"))

2754

for name, typ in (inspect.getmembers

2755

(dbus.service.Object)):

2756

exclude.add(name)

2757

2758

client_dict["encrypted_secret"] = (client

2759

.encrypted_secret)

2760

for attr in client.client_structure:

2761

if attr not in exclude:

2762

client_dict[attr] = getattr(client, attr)

2763

2764

clients[client.name] = client_dict

2765

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

2766

2298

2299

# Store client before exiting. Secrets are encrypted with key based

2300

# on what config file has. If config file is removed/edited, old

2301

# secret will thus be unrecovable.

2302

clients = []

2303

for client in tcp_server.clients.itervalues():

2304

client.encrypt_secret(client_settings[client.name]["secret"])

2305

2306

client_dict = {}

2307

2308

# A list of attributes that will not be stored when shuting down.

2309

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

2310

for name, typ in inspect.getmembers(dbus.service.Object):

2311

exclude.add(name)

2312

2313

client_dict["encrypted_secret"] = client.encrypted_secret

2314

for attr in client.client_structure:

2315

if attr not in exclude:

2316

client_dict[attr] = getattr(client, attr)

2317

2318

clients.append(client_dict)

2319

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

2320

2767

2321

try:

2768

with (tempfile.NamedTemporaryFile

2769

(mode='wb', suffix=".pickle", prefix='clients-',

2770

dir=os.path.dirname(stored_state_path),

2771

delete=False)) as stored_state:

2322

with os.fdopen(os.open(stored_state_path, os.O_CREAT|os.O_WRONLY|os.O_TRUNC, 0600), "wb") as stored_state:

2772

2323

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

2773

tempname=stored_state.name

2774

os.rename(tempname, stored_state_path)

2775

except (IOError, OSError) as e:

2776

if not debug:

2777

try:

2778

os.remove(tempname)

2779

except NameError:

2780

pass

2781

if e.errno in (errno.ENOENT, errno.EACCES, errno.EEXIST):

2782

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

2783

.format(os.strerror(e.errno)))

2784

else:

2785

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

2786

exc_info=e)

2787

raise e

2788

2324

except IOError as e:

2325

logger.warning("Could not save persistant state: {0}".format(e))

2326

if e.errno != errno.ENOENT:

2327

raise

2328

2789

2329

# Delete all clients, and settings from config

2790

2330

while tcp_server.clients:

2791

2331

name, client = tcp_server.clients.popitem()

2809

2349

# Need to initiate checking of clients

2810

2350

if client.enabled:

2811

2351

client.init_checker()

2352

2812

2353

2813

2354

tcp_server.enable()

2814

2355

tcp_server.server_activate()

2817

2358

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

2818

2359

if use_ipv6:

2819

2360

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

2820

" flowinfo %d, scope_id %d",

2821

*tcp_server.socket.getsockname())

2361

" flowinfo %d, scope_id %d"

2362

% tcp_server.socket.getsockname())

2822

2363

else: # IPv4

2823

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

2824

*tcp_server.socket.getsockname())

2364

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

2365

% tcp_server.socket.getsockname())

2825

2366

2826

2367

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

2827

2368

2830

2371

try:

2831

2372

service.activate()

2832

2373

except dbus.exceptions.DBusException as error:

2833

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

2374

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

2834

2375

cleanup()

2835

2376

sys.exit(1)

2836

2377

# End of Avahi example code

2843

2384

logger.debug("Starting main loop")

2844

2385

main_loop.run()

2845

2386

except AvahiError as error:

2846

logger.critical("Avahi Error", exc_info=error)

2387

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

2847

2388

cleanup()

2848

2389

sys.exit(1)

2849

2390

except KeyboardInterrupt:

2854

2395

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

2855

2396

cleanup()

2856

2397

2398

2857

2399

if __name__ == '__main__':

2858

2400

main()