/mandos/trunk : revision 518.1.3

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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 = "1.6.1"

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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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"""

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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

492

client["approved_by_default"] = config.getboolean(

493

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):

346

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

350

'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():

531

setattr(self, setting, value)

532

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if self.enabled:

534

if not hasattr(self, "last_enabled"):

535

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

542

353

if config is None:

354

config = {}

543

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

544

356

# Uppercase and remove spaces from fingerprint for later

545

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# comparison purposes with return value from the fingerprint()

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358

# function

359

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

360

.replace(" ", ""))

547

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

548

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

549

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:

365

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

366

(config["secfile"])),

367

"rb") as secfile:

368

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

376

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

381

["extended_timeout"])

382

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

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self.checker = None

553

384

self.checker_initiator_tag = None

554

385

self.disable_initiator_tag = None

386

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

555

387

self.checker_callback_tag = None

388

self.checker_command = config["checker"]

556

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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"])

559

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

426

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

433

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

446

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

453

(self.interval_milliseconds(),

620

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self.start_checker))

621

455

# 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):

631

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

1416

1122

"D-Bus signal"

1417

1123

return self.need_approval()

1418

1124

1125

# NeRwequest - signal

1126

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

1127

def NewRequest(self, ip):

1128

"""D-Bus signal

1129

Is sent after a client request a password.

1130

"""

1131

pass

1132

1419

1133

## Methods

1420

1134

1421

1135

# Approve - method

1479

1193

access="readwrite")

1480

1194

def ApprovalDuration_dbus_property(self, value=None):

1481

1195

if value is None: # get

1482

return dbus.UInt64(timedelta_to_milliseconds(

1196

return dbus.UInt64(_timedelta_to_milliseconds(

1483

1197

self.approval_duration))

1484

1198

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

1485

1199

1499

1213

def Host_dbus_property(self, value=None):

1500

1214

if value is None: # get

1501

1215

return dbus.String(self.host)

1502

self.host = unicode(value)

1216

self.host = value

1503

1217

1504

1218

# Created - property

1505

1219

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

1506

1220

def Created_dbus_property(self):

1507

return datetime_to_dbus(self.created)

1221

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

1508

1222

1509

1223

# LastEnabled - property

1510

1224

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

1531

1245

return

1532

1246

return datetime_to_dbus(self.last_checked_ok)

1533

1247

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

1248

# Expires - property

1541

1249

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

1542

1250

def Expires_dbus_property(self):

1553

1261

def Timeout_dbus_property(self, value=None):

1554

1262

if value is None: # get

1555

1263

return dbus.UInt64(self.timeout_milliseconds())

1556

old_timeout = self.timeout

1557

1264

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))

1265

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

1266

return

1267

# Reschedule timeout

1268

gobject.source_remove(self.disable_initiator_tag)

1269

self.disable_initiator_tag = None

1270

self.expires = None

1271

time_to_die = _timedelta_to_milliseconds((self

1272

.last_checked_ok

1273

+ self.timeout)

1274

- datetime.datetime

1275

.utcnow())

1276

if time_to_die <= 0:

1277

# The timeout has passed

1278

self.disable()

1279

else:

1280

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

1281

+ datetime.timedelta(milliseconds =

1282

time_to_die))

1283

self.disable_initiator_tag = (gobject.timeout_add

1284

(time_to_die, self.disable))

1574

1285

1575

1286

# ExtendedTimeout - property

1576

1287

@dbus_service_property(_interface, signature="t",

1589

1300

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

1590

1301

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

1591

1302

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

1303

# Reschedule checker run

1304

gobject.source_remove(self.checker_initiator_tag)

1305

self.checker_initiator_tag = (gobject.timeout_add

1306

(value, self.start_checker))

1307

self.start_checker() # Start one now, too

1598

1308

1599

1309

# Checker - property

1600

1310

@dbus_service_property(_interface, signature="s",

1602

1312

def Checker_dbus_property(self, value=None):

1603

1313

if value is None: # get

1604

1314

return dbus.String(self.checker_command)

1605

self.checker_command = unicode(value)

1315

self.checker_command = value

1606

1316

1607

1317

# CheckerRunning - property

1608

1318

@dbus_service_property(_interface, signature="b",

1637

1347

raise KeyError()

1638

1348

1639

1349

def __getattribute__(self, name):

1640

if name == '_pipe':

1350

if(name == '_pipe'):

1641

1351

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

1642

1352

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

1643

1353

data = self._pipe.recv()

1650

1360

return func

1651

1361

1652

1362

def __setattr__(self, name, value):

1653

if name == '_pipe':

1363

if(name == '_pipe'):

1654

1364

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

1655

1365

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

1656

1366

1367

class ClientDBusTransitional(ClientDBus):

1368

__metaclass__ = AlternateDBusNamesMetaclass

1657

1369

1658

1370

class ClientHandler(socketserver.BaseRequestHandler, object):

1659

1371

"""A class to handle client connections.

1721

1433

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

1722

1434

return

1723

1435

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

1436

if self.server.use_dbus:

1437

# Emit D-Bus signal

1438

client.NewRequest(str(self.client_address))

1724

1439

1725

1440

try:

1726

1441

client = ProxyClient(child_pipe, fpr,

1742

1457

client.Rejected("Disabled")

1743

1458

return

1744

1459

1745

if client.approved or not client.approval_delay:

1460

if client._approved or not client.approval_delay:

1746

1461

#We are approved or approval is disabled

1747

1462

break

1748

elif client.approved is None:

1463

elif client._approved is None:

1749

1464

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

1750

1465

client.name)

1751

1466

if self.server.use_dbus:

1764

1479

#wait until timeout or approved

1765

1480

time = datetime.datetime.now()

1766

1481

client.changedstate.acquire()

1767

client.changedstate.wait(

1768

float(timedelta_to_milliseconds(delay)

1769

/ 1000))

1482

(client.changedstate.wait

1483

(float(client._timedelta_to_milliseconds(delay)

1484

/ 1000)))

1770

1485

client.changedstate.release()

1771

1486

time2 = datetime.datetime.now()

1772

1487

if (time2 - time) >= delay:

1788

1503

try:

1789

1504

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

1790

1505

except gnutls.errors.GNUTLSError as error:

1791

logger.warning("gnutls send failed",

1792

exc_info=error)

1506

logger.warning("gnutls send failed")

1793

1507

return

1794

1508

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

1795

1509

sent, len(client.secret)

1798

1512

1799

1513

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

1800

1514

# bump the timeout using extended_timeout

1801

client.bump_timeout(client.extended_timeout)

1515

client.checked_ok(client.extended_timeout)

1802

1516

if self.server.use_dbus:

1803

1517

# Emit D-Bus signal

1804

1518

client.GotSecret()

1809

1523

try:

1810

1524

session.bye()

1811

1525

except gnutls.errors.GNUTLSError as error:

1812

logger.warning("GnuTLS bye failed",

1813

exc_info=error)

1526

logger.warning("GnuTLS bye failed")

1814

1527

1815

1528

@staticmethod

1816

1529

def peer_certificate(session):

1872

1585

# Convert the buffer to a Python bytestring

1873

1586

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

1874

1587

# Convert the bytestring to hexadecimal notation

1875

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

1588

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

1876

1589

return hex_fpr

1877

1590

1878

1591

1881

1594

def sub_process_main(self, request, address):

1882

1595

try:

1883

1596

self.finish_request(request, address)

1884

except Exception:

1597

except:

1885

1598

self.handle_error(request, address)

1886

1599

self.close_request(request)

1887

1600

1888

1601

def process_request(self, request, address):

1889

1602

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

1890

1603

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

1891

args = (request, address))

1604

args = (request,

1605

address))

1892

1606

proc.start()

1893

1607

return proc

1894

1608

1922

1636

use_ipv6: Boolean; to use IPv6 or not

1923

1637

"""

1924

1638

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

"""

1639

interface=None, use_ipv6=True):

1929

1640

self.interface = interface

1930

1641

if use_ipv6:

1931

1642

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

1643

socketserver.TCPServer.__init__(self, server_address,

1959

1644

RequestHandlerClass)

1960

1961

1645

def server_bind(self):

1962

1646

"""This overrides the normal server_bind() function

1963

1647

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

1971

1655

try:

1972

1656

self.socket.setsockopt(socket.SOL_SOCKET,

1973

1657

SO_BINDTODEVICE,

1974

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

1658

str(self.interface

1659

+ '\0'))

1975

1660

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:

1661

if error[0] == errno.EPERM:

1662

logger.error("No permission to"

1663

" bind to interface %s",

1664

self.interface)

1665

elif error[0] == errno.ENOPROTOOPT:

1980

1666

logger.error("SO_BINDTODEVICE not available;"

1981

1667

" cannot bind to interface %s",

1982

1668

self.interface)

1983

elif error.errno == errno.ENODEV:

1984

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

1985

" cannot bind", self.interface)

1986

1669

else:

1987

1670

raise

1988

1671

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

1991

1674

if self.address_family == socket.AF_INET6:

1992

1675

any_address = "::" # in6addr_any

1993

1676

else:

1994

any_address = "0.0.0.0" # INADDR_ANY

1677

any_address = socket.INADDR_ANY

1995

1678

self.server_address = (any_address,

1996

1679

self.server_address[1])

1997

1680

elif not self.server_address[1]:

2018

1701

"""

2019

1702

def __init__(self, server_address, RequestHandlerClass,

2020

1703

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

2021

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

1704

gnutls_priority=None, use_dbus=True):

2022

1705

self.enabled = False

2023

1706

self.clients = clients

2024

1707

if self.clients is None:

2028

1711

IPv6_TCPServer.__init__(self, server_address,

2029

1712

RequestHandlerClass,

2030

1713

interface = interface,

2031

use_ipv6 = use_ipv6,

2032

socketfd = socketfd)

1714

use_ipv6 = use_ipv6)

2033

1715

def server_activate(self):

2034

1716

if self.enabled:

2035

1717

return socketserver.TCPServer.server_activate(self)

2048

1730

2049

1731

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

2050

1732

proc = None, client_object=None):

1733

condition_names = {

1734

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

1735

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

1736

# blocking).

1737

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

1738

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

1739

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

1740

# broken, usually for pipes and

1741

# sockets).

1742

}

1743

conditions_string = ' | '.join(name

1744

for cond, name in

1745

condition_names.iteritems()

1746

if cond & condition)

2051

1747

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

2052

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

1748

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

2053

1749

# Wait for other process to exit

2054

1750

proc.join()

2055

1751

return False

2113

1809

return True

2114

1810

2115

1811

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

1812

def string_to_delta(interval):

2216

1813

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

2217

1814

2228

1825

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

2229

1826

datetime.timedelta(0, 330)

2230

1827

"""

2231

2232

try:

2233

return rfc3339_duration_to_delta(interval)

2234

except ValueError:

2235

pass

2236

2237

1828

timevalue = datetime.timedelta(0)

2238

1829

for s in interval.split():

2239

1830

try:

2250

1841

elif suffix == "w":

2251

1842

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

2252

1843

else:

2253

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

2254

.format(suffix))

1844

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

2255

1845

except (ValueError, IndexError) as e:

2256

1846

raise ValueError(*(e.args))

2257

1847

timevalue += delta

2258

1848

return timevalue

2259

1849

2260

1850

1851

def if_nametoindex(interface):

1852

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

1853

1854

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

1855

global if_nametoindex

1856

try:

1857

if_nametoindex = (ctypes.cdll.LoadLibrary

1858

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

1859

.if_nametoindex)

1860

except (OSError, AttributeError):

1861

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

1862

def if_nametoindex(interface):

1863

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

1864

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

1865

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

1866

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1867

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

1868

interface))

1869

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

1870

ifreq[16:20])[0]

1871

return interface_index

1872

return if_nametoindex(interface)

1873

1874

2261

1875

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

2262

1876

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

2263

1877

2271

1885

sys.exit()

2272

1886

if not noclose:

2273

1887

# Close all standard open file descriptors

2274

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

1888

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

2275

1889

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

2276

1890

raise OSError(errno.ENODEV,

2277

"{0} not a character device"

2278

.format(os.devnull))

1891

"%s not a character device"

1892

% os.path.devnull)

2279

1893

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

2280

1894

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

2281

1895

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

2290

1904

2291

1905

parser = argparse.ArgumentParser()

2292

1906

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

2293

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

1907

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

2294

1908

help="show version number and exit")

2295

1909

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

2296

1910

help="Bind to interface IF")

2302

1916

help="Run self-test")

2303

1917

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

2304

1918

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

2305

" to terminal", default=None)

1919

" to terminal")

2306

1920

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

2307

1921

help="Debug level for stdout output")

2308

1922

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

2315

1929

" files")

2316

1930

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

2317

1931

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

2318

" system bus interface", default=None)

1932

" system bus interface")

2319

1933

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

2320

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

2321

default=None)

1934

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

2322

1935

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

1936

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

1937

default=True)

1938

2333

1939

options = parser.parse_args()

2334

1940

2335

1941

if options.check:

2343

1949

"port": "",

2344

1950

"debug": "False",

2345

1951

"priority":

2346

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

1952

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

2347

1953

"servicename": "Mandos",

2348

1954

"use_dbus": "True",

2349

1955

"use_ipv6": "True",

2350

1956

"debuglevel": "",

2351

"restore": "True",

2352

"socket": "",

2353

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

2354

"foreground": "False",

2355

1957

}

2356

1958

2357

1959

# Parse config file for server-global settings

2362

1964

# Convert the SafeConfigParser object to a dict

2363

1965

server_settings = server_config.defaults()

2364

1966

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

2365

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

1967

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

2366

1968

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

2367

1969

option)

2368

1970

if server_settings["port"]:

2369

1971

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

2370

1972

"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

1973

del server_config

2381

1974

2382

1975

# Override the settings from the config file with command line

2383

1976

# options, if set.

2384

1977

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

2385

1978

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

2386

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

2387

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

1979

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

2388

1980

value = getattr(options, option)

2389

1981

if value is not None:

2390

1982

server_settings[option] = value

2393

1985

for option in server_settings.keys():

2394

1986

if type(server_settings[option]) is str:

2395

1987

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

1988

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

2404

1989

2405

1990

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

2409

1994

debuglevel = server_settings["debuglevel"]

2410

1995

use_dbus = server_settings["use_dbus"]

2411

1996

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

1997

2425

1998

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

2426

1999

syslogger.setFormatter(logging.Formatter

2427

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

2428

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

2429

.format(server_settings

2430

["servicename"])))

2000

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

2001

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

2002

% server_settings["servicename"]))

2431

2003

2432

2004

# Parse config file with clients

2433

client_config = configparser.SafeConfigParser(Client

2434

.client_defaults)

2005

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

2006

"extended_timeout": "15m",

2007

"interval": "2m",

2008

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

2009

"host": "",

2010

"approval_delay": "0s",

2011

"approval_duration": "1s",

2012

}

2013

client_config = configparser.SafeConfigParser(client_defaults)

2435

2014

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

2436

2015

"clients.conf"))

2437

2016

2446

2025

use_ipv6=use_ipv6,

2447

2026

gnutls_priority=

2448

2027

server_settings["priority"],

2449

use_dbus=use_dbus,

2450

socketfd=(server_settings["socket"]

2451

or None))

2452

if not foreground:

2028

use_dbus=use_dbus)

2029

if not debug:

2453

2030

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

2454

pidfile = None

2455

2031

try:

2456

2032

pidfile = open(pidfilename, "w")

2457

except IOError as e:

2458

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

2459

exc_info=e)

2033

except IOError:

2034

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

2460

2035

2461

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

2036

try:

2037

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

2038

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

2039

except KeyError:

2462

2040

try:

2463

uid = pwd.getpwnam(name).pw_uid

2464

gid = pwd.getpwnam(name).pw_gid

2465

break

2041

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

2042

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

2466

2043

except KeyError:

2467

continue

2468

else:

2469

uid = 65534

2470

gid = 65534

2044

try:

2045

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

2046

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

2047

except KeyError:

2048

uid = 65534

2049

gid = 65534

2471

2050

try:

2472

2051

os.setgid(gid)

2473

2052

os.setuid(uid)

2474

2053

except OSError as error:

2475

if error.errno != errno.EPERM:

2054

if error[0] != errno.EPERM:

2476

2055

raise error

2477

2056

2057

if not debug and not debuglevel:

2058

logger.setLevel(logging.WARNING)

2059

if debuglevel:

2060

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

2061

logger.setLevel(level)

2062

2478

2063

if debug:

2064

logger.setLevel(logging.DEBUG)

2479

2065

# Enable all possible GnuTLS debugging

2480

2066

2481

2067

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

2490

2076

.gnutls_global_set_log_function(debug_gnutls))

2491

2077

2492

2078

# Redirect stdin so all checkers get /dev/null

2493

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

2079

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

2494

2080

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

2495

2081

if null > 2:

2496

2082

os.close(null)

2083

else:

2084

# No console logging

2085

logger.removeHandler(console)

2497

2086

2498

2087

# Need to fork before connecting to D-Bus

2499

if not foreground:

2088

if not debug:

2500

2089

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

2501

2090

daemon()

2502

2091

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

2092

global main_loop

2508

2093

# From the Avahi example code

2509

DBusGMainLoop(set_as_default=True)

2094

DBusGMainLoop(set_as_default=True )

2510

2095

main_loop = gobject.MainLoop()

2511

2096

bus = dbus.SystemBus()

2512

2097

# End of Avahi example code

2518

2103

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

2519

2104

do_not_queue=True))

2520

2105

except dbus.exceptions.NameExistsException as e:

2521

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

2106

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

2522

2107

use_dbus = False

2523

2108

server_settings["use_dbus"] = False

2524

2109

tcp_server.use_dbus = False

2536

2121

2537

2122

client_class = Client

2538

2123

if use_dbus:

2539

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

2540

2541

client_settings = Client.config_parser(client_config)

2124

client_class = functools.partial(ClientDBusTransitional,

2125

bus = bus)

2126

2127

special_settings = {

2128

# Some settings need to be accessd by special methods;

2129

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

2130

"approved_by_default":

2131

lambda section:

2132

client_config.getboolean(section, "approved_by_default"),

2133

}

2134

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

2135

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

2136

# with exceptions for any special settings as defined above

2137

client_settings = dict((clientname,

2138

dict((setting,

2139

(value if setting not in special_settings

2140

else special_settings[setting](clientname)))

2141

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

2142

for clientname in client_config.sections())

2143

2542

2144

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.

2145

clients_data = []

2146

2147

# Get client data and settings from last running state.

2554

2148

if server_settings["restore"]:

2555

2149

try:

2556

2150

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

2557

clients_data, old_client_settings = (pickle.load

2558

(stored_state))

2151

clients_data, old_client_settings = pickle.load(stored_state)

2559

2152

os.remove(stored_state_path)

2560

2153

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)

2154

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

2155

if e.errno != errno.ENOENT:

2567

2156

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))

2157

2158

for client in clients_data:

2159

client_name = client["name"]

2160

2161

# Decide which value to use after restoring saved state.

2162

# We have three different values: Old config file,

2163

# new config file, and saved state.

2164

# New config value takes precedence if it differs from old

2165

# config value, otherwise use saved state.

2166

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

2622

2167

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

2168

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

2169

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

2170

# attribute)

2171

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

2172

setattr(client, name, value)

2173

except KeyError:

2174

pass

2175

2176

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

2177

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

2178

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

2179

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

2180

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

2181

> client["interval"]):

2182

if client["last_checker_status"] != 0:

2183

client["enabled"] = False

2184

else:

2185

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

2186

2187

client["changedstate"] = (multiprocessing_manager

2188

.Condition(multiprocessing_manager

2189

.Lock()))

2190

if use_dbus:

2191

new_client = ClientDBusTransitional.__new__(ClientDBusTransitional)

2192

tcp_server.clients[client_name] = new_client

2193

new_client.bus = bus

2194

for name, value in client.iteritems():

2195

setattr(new_client, name, value)

2196

client_object_name = unicode(client_name).translate(

2197

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

2198

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

2199

new_client.dbus_object_path = (dbus.ObjectPath

2200

("/clients/" + client_object_name))

2201

DBusObjectWithProperties.__init__(new_client,

2202

new_client.bus,

2203

new_client.dbus_object_path)

2204

else:

2205

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

2206

for name, value in client.iteritems():

2207

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

2208

2209

tcp_server.clients[client_name].decrypt_secret(

2210

client_settings[client_name]["secret"])

2211

2212

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

2213

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

2214

del tcp_server.clients[clientname]

2215

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

2216

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

2217

config =

2218

client_settings

2219

[clientname]))

2220

2221

2648

2222

if not tcp_server.clients:

2649

2223

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

2224

2225

if not debug:

2226

try:

2227

with pidfile:

2228

pid = os.getpid()

2229

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

2230

del pidfile

2231

except IOError:

2232

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

2233

pidfilename, pid)

2234

except NameError:

2235

# "pidfile" was never created

2236

pass

2661

2237

del pidfilename

2238

2239

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

2662

2240

2663

2241

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

2664

2242

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

2665

2243

2666

2244

if use_dbus:

2667

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

2668

"se.bsnet.fukt.Mandos"})

2669

class MandosDBusService(DBusObjectWithProperties):

2245

class MandosDBusService(dbus.service.Object):

2670

2246

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

2671

2247

def __init__(self):

2672

2248

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

2673

2249

_interface = "se.recompile.Mandos"

2674

2250

2675

@dbus_interface_annotations(_interface)

2676

def _foo(self):

2677

return { "org.freedesktop.DBus.Property"

2678

".EmitsChangedSignal":

2679

"false"}

2680

2681

2251

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

2682

2252

def ClientAdded(self, objpath):

2683

2253

"D-Bus signal"

2725

2295

2726

2296

del _interface

2727

2297

2728

mandos_dbus_service = MandosDBusService()

2298

class MandosDBusServiceTransitional(MandosDBusService):

2299

__metaclass__ = AlternateDBusNamesMetaclass

2300

mandos_dbus_service = MandosDBusServiceTransitional()

2729

2301

2730

2302

def cleanup():

2731

2303

"Cleanup function; run on exit"

2732

2304

service.cleanup()

2733

2305

2734

2306

multiprocessing.active_children()

2735

wnull.close()

2736

2307

if not (tcp_server.clients or client_settings):

2737

2308

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

2309

2310

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

2311

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

2312

# secret will thus be unrecovable.

2313

clients = []

2314

for client in tcp_server.clients.itervalues():

2315

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

2316

2317

client_dict = {}

2318

2319

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

2320

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

2321

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

2322

exclude.add(name)

2323

2324

client_dict["encrypted_secret"] = client.encrypted_secret

2325

for attr in client.client_structure:

2326

if attr not in exclude:

2327

client_dict[attr] = getattr(client, attr)

2328

2329

clients.append(client_dict)

2330

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

2331

2767

2332

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:

2333

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

2772

2334

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

2335

except IOError as e:

2336

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

2337

if e.errno != errno.ENOENT:

2338

raise

2339

2789

2340

# Delete all clients, and settings from config

2790

2341

while tcp_server.clients:

2791

2342

name, client = tcp_server.clients.popitem()

2809

2360

# Need to initiate checking of clients

2810

2361

if client.enabled:

2811

2362

client.init_checker()

2363

2812

2364

2813

2365

tcp_server.enable()

2814

2366

tcp_server.server_activate()

2817

2369

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

2818

2370

if use_ipv6:

2819

2371

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

2820

" flowinfo %d, scope_id %d",

2821

*tcp_server.socket.getsockname())

2372

" flowinfo %d, scope_id %d"

2373

% tcp_server.socket.getsockname())

2822

2374

else: # IPv4

2823

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

2824

*tcp_server.socket.getsockname())

2375

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

2376

% tcp_server.socket.getsockname())

2825

2377

2826

2378

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

2827

2379

2830

2382

try:

2831

2383

service.activate()

2832

2384

except dbus.exceptions.DBusException as error:

2833

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

2385

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

2834

2386

cleanup()

2835

2387

sys.exit(1)

2836

2388

# End of Avahi example code

2843

2395

logger.debug("Starting main loop")

2844

2396

main_loop.run()

2845

2397

except AvahiError as error:

2846

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

2398

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

2847

2399

cleanup()

2848

2400

sys.exit(1)

2849

2401

except KeyboardInterrupt:

2854

2406

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

2855

2407

cleanup()

2856

2408

2409

2857

2410

if __name__ == '__main__':

2858

2411

main()