/mandos/trunk : revision 522

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

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#

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# Everything else is

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#

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

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

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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from future_builtins import *

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import SocketServer as socketserver

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import socket

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import argparse

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import cPickle as pickle

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import multiprocessing

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import types

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import binascii

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import tempfile

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import itertools

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import collections

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import hashlib

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import dbus

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import dbus.service

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import ctypes.util

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import xml.dom.minidom

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import inspect

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import Crypto.Cipher.AES

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try:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.6.0"

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stored_state_file = "clients.pickle"

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version = "1.4.1"

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logger = logging.getLogger()

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

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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

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.if_nametoindex)

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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

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

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

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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

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interface))

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

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ifreq[16:20])[0]

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return interface_index

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

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"""init logger and add loglevel"""

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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

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pass

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class PGPEngine(object):

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

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def __init__(self):

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

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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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def __enter__(self):

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return self

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

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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

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topdown = False):

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for filename in files:

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

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for dirname in dirs:

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

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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

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

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

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def encrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir=self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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class AvahiError(Exception):

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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def __init__(self, interface = avahi.IF_UNSPEC, name = None,

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

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

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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

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if self.rename_count >= self.max_renames:

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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

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

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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

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self.remove()

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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

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

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elif state == avahi.ENTRY_GROUP_FAILURE:

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

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unicode(error))

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raise AvahiGroupError("State changed: {0!s}"

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.format(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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def cleanup(self):

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

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException):

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dbus.exceptions.DBusException) as e:

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pass

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self.group = None

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self.remove()

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

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

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

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

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else:

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

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def activate(self):

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

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if self.server is None:

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self.server_state_changed)

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

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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

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

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.format(self.name)))

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

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

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% self.name))

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return ret

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def timedelta_to_milliseconds(td):

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def _timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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

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Attributes:

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

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

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

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

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

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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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status of last checker. -1 reflect crashed

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checker, 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

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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

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"enabled")

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

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.replace(" ", ""))

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if "secret" in section:

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

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elif "secfile" in section:

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

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(section["secfile"])),

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"rb") as secfile:

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

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else:

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

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.format(section))

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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return settings

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

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return _timedelta_to_milliseconds(self.approval_delay)

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

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

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

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attribute."""

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self.name = name

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if server_settings is None:

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server_settings = {}

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self.server_settings = server_settings

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# adding all client settings

530

for setting, value in settings.iteritems():

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setattr(self, setting, value)

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if self.enabled:

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if not hasattr(self, "last_enabled"):

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self.last_enabled = datetime.datetime.utcnow()

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if not hasattr(self, "expires"):

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

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+ self.timeout)

539

else:

540

self.last_enabled = None

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self.expires = None

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if config is None:

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config = {}

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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# function

359

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

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.replace(" ", ""))

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

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

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datetime.datetime.utcnow())

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# attributes specific for this server instance

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if "secret" in config:

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

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elif "secfile" in config:

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

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(config["secfile"])),

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"rb") as secfile:

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self.secret = secfile.read()

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else:

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

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% self.name)

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

373

self.created = datetime.datetime.utcnow()

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self.enabled = True

375

self.last_approval_request = None

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self.last_enabled = datetime.datetime.utcnow()

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self.last_checked_ok = None

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self.last_checker_status = None

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

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self.extended_timeout = string_to_delta(config

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["extended_timeout"])

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

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self.checker = None

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384

self.checker_initiator_tag = None

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self.disable_initiator_tag = None

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

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self.checker_callback_tag = None

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self.checker_command = config["checker"]

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self.current_checker_command = None

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self.approved = None

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self._approved = None

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

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True)

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self.approvals_pending = 0

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self.approval_delay = string_to_delta(

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config["approval_delay"])

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self.approval_duration = string_to_delta(

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config["approval_duration"])

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self.changedstate = (multiprocessing_manager

560

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.Condition(multiprocessing_manager

561

400

.Lock()))

562

self.client_structure = [attr for attr in

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self.__dict__.iterkeys()

401

self.client_structure = [attr for attr

402

in self.__dict__.iterkeys()

564

403

if not attr.startswith("_")]

565

404

self.client_structure.append("client_structure")

566

405

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

568

408

lambda obj:

569

409

isinstance(obj,

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421

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

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422

# Already enabled

583

423

return

424

self.send_changedstate()

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425

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

585

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self.enabled = True

586

427

self.last_enabled = datetime.datetime.utcnow()

587

428

self.init_checker()

588

self.send_changedstate()

589

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430

def disable(self, quiet=True):

591

431

"""Disable this client."""

592

432

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

593

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return False

594

434

if not quiet:

435

self.send_changedstate()

436

if not quiet:

595

437

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

596

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

438

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

597

439

gobject.source_remove(self.disable_initiator_tag)

598

440

self.disable_initiator_tag = None

599

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self.expires = None

600

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

442

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

601

443

gobject.source_remove(self.checker_initiator_tag)

602

444

self.checker_initiator_tag = None

603

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self.stop_checker()

604

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self.enabled = False

605

if not quiet:

606

self.send_changedstate()

607

447

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

608

448

return False

609

449

610

450

def __del__(self):

611

451

self.disable()

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452

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def init_checker(self):

614

454

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

615

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# and every interval from then on.

616

if self.checker_initiator_tag is not None:

617

gobject.source_remove(self.checker_initiator_tag)

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456

self.checker_initiator_tag = (gobject.timeout_add

619

457

(self.interval_milliseconds(),

620

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self.start_checker))

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

622

if self.disable_initiator_tag is not None:

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gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = (gobject.timeout_add

625

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(self.timeout_milliseconds(),

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self.disable))

627

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# Also start a new checker *right now*.

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464

self.start_checker()

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630

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

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468

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

632

469

self.checker_callback_tag = None

633

470

self.checker = None

634

471

if os.WIFEXITED(condition):

635

self.last_checker_status = os.WEXITSTATUS(condition)

472

self.last_checker_status = os.WEXITSTATUS(condition)

636

473

if self.last_checker_status == 0:

637

474

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

638

475

vars(self))

645

482

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

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483

vars(self))

647

484

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."""

485

def checked_ok(self, timeout=None):

486

"""Bump up the timeout for this client.

487

488

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

489

alive and well.

490

"""

656

491

if timeout is None:

657

492

timeout = self.timeout

493

self.last_checked_ok = datetime.datetime.utcnow()

658

494

if self.disable_initiator_tag is not None:

659

495

gobject.source_remove(self.disable_initiator_tag)

660

self.disable_initiator_tag = None

661

496

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

662

497

self.disable_initiator_tag = (gobject.timeout_add

663

(timedelta_to_milliseconds

498

(_timedelta_to_milliseconds

664

499

(timeout), self.disable))

665

500

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

666

501

673

508

If a checker already exists, leave it running and do

674

509

nothing."""

675

510

# 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

511

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

512

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

513

# client would inevitably timeout, since no checker would get

514

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

680

515

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

681

516

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

682

517

# should be.

696

531

self.current_checker_command)

697

532

# Start a new checker if needed

698

533

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

534

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

535

# In case checker_command has exactly one % operator

536

command = self.checker_command % self.host

537

except TypeError:

538

# Escape attributes for the shell

539

escaped_attrs = dict(

540

(attr,

541

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

542

errors=

543

'replace')))

544

for attr in

545

self.runtime_expansions)

546

547

try:

548

command = self.checker_command % escaped_attrs

549

except TypeError as error:

550

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

551

' %s', self.checker_command, error)

552

return True # Try again later

710

553

self.current_checker_command = command

711

554

try:

712

555

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

715

558

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

716

559

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

717

560

# 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

561

self.checker = subprocess.Popen(command,

727

562

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:

563

shell=True, cwd="/")

564

self.checker_callback_tag = (gobject.child_watch_add

565

(self.checker.pid,

566

self.checker_callback,

567

data=command))

568

# The checker may have completed before the gobject

569

# watch was added. Check for this.

741

570

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

571

if pid:

572

gobject.source_remove(self.checker_callback_tag)

573

self.checker_callback(pid, status, command)

742

574

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)

575

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

576

error)

752

577

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

753

578

return True

754

579

761

586

return

762

587

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

763

588

try:

764

self.checker.terminate()

589

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

765

590

#time.sleep(0.5)

766

591

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

767

# self.checker.kill()

592

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

768

593

except OSError as error:

769

594

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

770

595

raise

771

596

self.checker = None

772

597

598

# Encrypts a client secret and stores it in a varible

599

# encrypted_secret

600

def encrypt_secret(self, key):

601

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

602

# supplied key

603

hasheng = hashlib.sha256()

604

hasheng.update(key)

605

encryptionkey = hasheng.digest()

606

607

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

608

# sucessful

609

hasheng = hashlib.sha256()

610

hasheng.update(self.secret)

611

validationhash = hasheng.digest()

612

613

# Encrypt secret

614

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

615

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

616

Crypto.Cipher.AES.MODE_CFB, iv)

617

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

618

self.encrypted_secret = (ciphertext, iv)

619

620

# Decrypt a encrypted client secret

621

def decrypt_secret(self, key):

622

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

623

# supplied key

624

hasheng = hashlib.sha256()

625

hasheng.update(key)

626

encryptionkey = hasheng.digest()

627

628

# Decrypt encrypted secret

629

ciphertext, iv = self.encrypted_secret

630

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

631

Crypto.Cipher.AES.MODE_CFB, iv)

632

plain = ciphereng.decrypt(ciphertext)

633

634

# Validate decrypted secret to know if it was succesful

635

hasheng = hashlib.sha256()

636

validationhash = plain[:hasheng.digest_size]

637

secret = plain[hasheng.digest_size:]

638

hasheng.update(secret)

639

640

# If validation fails, we use key as new secret. Otherwise, we

641

# use the decrypted secret

642

if hasheng.digest() == validationhash:

643

self.secret = secret

644

else:

645

self.secret = key

646

del self.encrypted_secret

647

773

648

774

649

def dbus_service_property(dbus_interface, signature="v",

775

650

access="readwrite", byte_arrays=False):

787

662

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

788

663

if byte_arrays and signature != "ay":

789

664

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

790

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

665

" signature %r" % signature)

791

666

def decorator(func):

792

667

func._dbus_is_property = True

793

668

func._dbus_interface = dbus_interface

801

676

return decorator

802

677

803

678

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

679

class DBusPropertyException(dbus.exceptions.DBusException):

842

680

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

843

681

"""

866

704

"""

867

705

868

706

@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)

707

def _is_dbus_property(obj):

708

return getattr(obj, "_dbus_is_property", False)

877

709

878

def _get_all_dbus_things(self, thing):

710

def _get_all_dbus_properties(self):

879

711

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

880

712

"""

881

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

882

name),

883

athing.__get__(self))

713

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

884

714

for cls in self.__class__.__mro__

885

for name, athing in

886

inspect.getmembers(cls,

887

self._is_dbus_thing(thing)))

715

for name, prop in

716

inspect.getmembers(cls, self._is_dbus_property))

888

717

889

718

def _get_dbus_property(self, interface_name, property_name):

890

719

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

892

721

"""

893

722

for cls in self.__class__.__mro__:

894

723

for name, value in (inspect.getmembers

895

(cls,

896

self._is_dbus_thing("property"))):

724

(cls, self._is_dbus_property)):

897

725

if (value._dbus_name == property_name

898

726

and value._dbus_interface == interface_name):

899

727

return value.__get__(self)

928

756

# signatures other than "ay".

929

757

if prop._dbus_signature != "ay":

930

758

raise ValueError

931

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

932

for byte in value))

759

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

760

for byte in value))

933

761

prop(value)

934

762

935

763

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

940

768

941

769

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

942

770

"""

943

properties = {}

944

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

771

all = {}

772

for name, prop in self._get_all_dbus_properties():

945

773

if (interface_name

946

774

and interface_name != prop._dbus_interface):

947

775

# Interface non-empty but did not match

951

779

continue

952

780

value = prop()

953

781

if not hasattr(value, "variant_level"):

954

properties[name] = value

782

all[name] = value

955

783

continue

956

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

957

value.variant_level+1)

958

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

784

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

785

value.variant_level+1)

786

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

959

787

960

788

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

961

789

out_signature="s",

962

790

path_keyword='object_path',

963

791

connection_keyword='connection')

964

792

def Introspect(self, object_path, connection):

965

"""Overloading of standard D-Bus method.

966

967

Inserts property tags and interface annotation tags.

793

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

968

794

"""

969

795

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

970

796

connection)

977

803

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

978

804

return e

979

805

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

980

# Add property tags

981

806

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

982

807

for name, prop

983

in self._get_all_dbus_things("property")

808

in self._get_all_dbus_properties()

984

809

if prop._dbus_interface

985

810

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

986

811

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

812

# Add the names to the return values for the

1019

813

# "org.freedesktop.DBus.Properties" methods

1020

814

if (if_tag.getAttribute("name")

1035

829

except (AttributeError, xml.dom.DOMException,

1036

830

xml.parsers.expat.ExpatError) as error:

1037

831

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

1038

exc_info=error)

832

error)

1039

833

return xmlstring

1040

834

1041

835

1042

def datetime_to_dbus(dt, variant_level=0):

836

def datetime_to_dbus (dt, variant_level=0):

1043

837

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

1044

838

if dt is None:

1045

839

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

1046

840

return dbus.String(dt.isoformat(),

1047

841

variant_level=variant_level)

1048

842

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).

843

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

844

.__metaclass__):

845

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

846

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

1072

847

"""

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):

848

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

849

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

850

# methods, signals, or properties in them

851

for base in (b for b in bases

852

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

853

# Go though all attributes of the base class

854

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

1080

855

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

1081

856

# with the wrong interface name

1082

857

if (not hasattr(attribute, "_dbus_interface")

1083

858

or not attribute._dbus_interface

1084

.startswith(orig_interface_name)):

859

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

1085

860

continue

1086

861

# Create an alternate D-Bus interface name based on

1087

862

# the current name

1088

863

alt_interface = (attribute._dbus_interface

1089

.replace(orig_interface_name,

1090

alt_interface_name))

1091

interface_names.add(alt_interface)

864

.replace("se.recompile.Mandos",

865

"se.bsnet.fukt.Mandos"))

1092

866

# Is this a D-Bus signal?

1093

867

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

1094

# Extract the original non-method undecorated

1095

# function by black magic

868

# Extract the original non-method function by

869

# black magic

1096

870

nonmethod_func = (dict(

1097

871

zip(attribute.func_code.co_freevars,

1098

872

attribute.__closure__))["func"]

1109

883

nonmethod_func.func_name,

1110

884

nonmethod_func.func_defaults,

1111

885

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

886

# 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

887

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

888

# signals gets sent when the function is called

1122

889

def fixscope(func1, func2):

1123

890

"""This function is a scope container to pass

1124

891

func1 and func2 to the "call_both" function

1131

898

return call_both

1132

899

# Create the "call_both" function and add it to

1133

900

# the class

1134

attr[attrname] = fixscope(attribute, new_function)

901

attr[attrname] = fixscope(attribute,

902

new_function)

1135

903

# Is this a D-Bus method?

1136

904

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

1137

905

# Create a new, but exactly alike, function

1148

916

attribute.func_name,

1149

917

attribute.func_defaults,

1150

918

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

919

# Is this a D-Bus property?

1158

920

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

1159

921

# Create a new, but exactly alike, function

1173

935

attribute.func_name,

1174

936

attribute.func_defaults,

1175

937

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"})

938

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

939

1221

940

class ClientDBus(Client, DBusObjectWithProperties):

1222

941

"""A Client class using D-Bus

1223

942

1233

952

1234

953

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

1235

954

self.bus = bus

955

self._approvals_pending = 0

1236

956

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

957

self.add_to_dbus()

958

959

def add_to_dbus(self):

1237

960

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

1238

961

# the D-Bus

1239

962

client_object_name = unicode(self.name).translate(

1243

966

("/clients/" + client_object_name))

1244

967

DBusObjectWithProperties.__init__(self, self.bus,

1245

968

self.dbus_object_path)

1246

969

1247

970

def notifychangeproperty(transform_func,

1248

971

dbus_name, type_func=lambda x: x,

1249

972

variant_level=1):

1250

973

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

1251

974

its changes to DBus.

1252

975

1253

976

transform_fun: Function that takes a value and a variant_level

1254

977

and transforms it to a D-Bus type.

1255

978

dbus_name: D-Bus name of the variable

1272

995

1273

996

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

1274

997

998

1275

999

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1276

1000

approvals_pending = notifychangeproperty(dbus.Boolean,

1277

1001

"ApprovalPending",

1284

1008

checker is not None)

1285

1009

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1286

1010

"LastCheckedOK")

1287

last_checker_status = notifychangeproperty(dbus.Int16,

1288

"LastCheckerStatus")

1289

1011

last_approval_request = notifychangeproperty(

1290

1012

datetime_to_dbus, "LastApprovalRequest")

1291

1013

approved_by_default = notifychangeproperty(dbus.Boolean,

1292

1014

"ApprovedByDefault")

1293

approval_delay = notifychangeproperty(dbus.UInt64,

1015

approval_delay = notifychangeproperty(dbus.UInt16,

1294

1016

"ApprovalDelay",

1295

1017

type_func =

1296

timedelta_to_milliseconds)

1018

_timedelta_to_milliseconds)

1297

1019

approval_duration = notifychangeproperty(

1298

dbus.UInt64, "ApprovalDuration",

1299

type_func = timedelta_to_milliseconds)

1020

dbus.UInt16, "ApprovalDuration",

1021

type_func = _timedelta_to_milliseconds)

1300

1022

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

1301

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

1023

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

1302

1024

type_func =

1303

timedelta_to_milliseconds)

1025

_timedelta_to_milliseconds)

1304

1026

extended_timeout = notifychangeproperty(

1305

dbus.UInt64, "ExtendedTimeout",

1306

type_func = timedelta_to_milliseconds)

1307

interval = notifychangeproperty(dbus.UInt64,

1027

dbus.UInt16, "ExtendedTimeout",

1028

type_func = _timedelta_to_milliseconds)

1029

interval = notifychangeproperty(dbus.UInt16,

1308

1030

"Interval",

1309

1031

type_func =

1310

timedelta_to_milliseconds)

1032

_timedelta_to_milliseconds)

1311

1033

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

1312

1034

1313

1035

del notifychangeproperty

1355

1077

return r

1356

1078

1357

1079

def _reset_approved(self):

1358

self.approved = None

1080

self._approved = None

1359

1081

return False

1360

1082

1361

1083

def approve(self, value=True):

1362

self.approved = value

1363

gobject.timeout_add(timedelta_to_milliseconds

1084

self.send_changedstate()

1085

self._approved = value

1086

gobject.timeout_add(_timedelta_to_milliseconds

1364

1087

(self.approval_duration),

1365

1088

self._reset_approved)

1366

self.send_changedstate()

1089

1367

1090

1368

1091

## D-Bus methods, signals & properties

1369

1092

_interface = "se.recompile.Mandos.Client"

1370

1093

1371

## Interfaces

1372

1373

@dbus_interface_annotations(_interface)

1374

def _foo(self):

1375

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

1376

"false"}

1377

1378

1094

## Signals

1379

1095

1380

1096

# CheckerCompleted - signal

1479

1195

access="readwrite")

1480

1196

def ApprovalDuration_dbus_property(self, value=None):

1481

1197

if value is None: # get

1482

return dbus.UInt64(timedelta_to_milliseconds(

1198

return dbus.UInt64(_timedelta_to_milliseconds(

1483

1199

self.approval_duration))

1484

1200

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

1485

1201

1499

1215

def Host_dbus_property(self, value=None):

1500

1216

if value is None: # get

1501

1217

return dbus.String(self.host)

1502

self.host = unicode(value)

1218

self.host = value

1503

1219

1504

1220

# Created - property

1505

1221

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

1506

1222

def Created_dbus_property(self):

1507

return datetime_to_dbus(self.created)

1223

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

1508

1224

1509

1225

# LastEnabled - property

1510

1226

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

1531

1247

return

1532

1248

return datetime_to_dbus(self.last_checked_ok)

1533

1249

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

1250

# Expires - property

1541

1251

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

1542

1252

def Expires_dbus_property(self):

1553

1263

def Timeout_dbus_property(self, value=None):

1554

1264

if value is None: # get

1555

1265

return dbus.UInt64(self.timeout_milliseconds())

1556

old_timeout = self.timeout

1557

1266

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))

1267

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

1268

return

1269

# Reschedule timeout

1270

gobject.source_remove(self.disable_initiator_tag)

1271

self.disable_initiator_tag = None

1272

self.expires = None

1273

time_to_die = _timedelta_to_milliseconds((self

1274

.last_checked_ok

1275

+ self.timeout)

1276

- datetime.datetime

1277

.utcnow())

1278

if time_to_die <= 0:

1279

# The timeout has passed

1280

self.disable()

1281

else:

1282

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

1283

+ datetime.timedelta(milliseconds =

1284

time_to_die))

1285

self.disable_initiator_tag = (gobject.timeout_add

1286

(time_to_die, self.disable))

1574

1287

1575

1288

# ExtendedTimeout - property

1576

1289

@dbus_service_property(_interface, signature="t",

1589

1302

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

1590

1303

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

1591

1304

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

1305

# Reschedule checker run

1306

gobject.source_remove(self.checker_initiator_tag)

1307

self.checker_initiator_tag = (gobject.timeout_add

1308

(value, self.start_checker))

1309

self.start_checker() # Start one now, too

1598

1310

1599

1311

# Checker - property

1600

1312

@dbus_service_property(_interface, signature="s",

1602

1314

def Checker_dbus_property(self, value=None):

1603

1315

if value is None: # get

1604

1316

return dbus.String(self.checker_command)

1605

self.checker_command = unicode(value)

1317

self.checker_command = value

1606

1318

1607

1319

# CheckerRunning - property

1608

1320

@dbus_service_property(_interface, signature="b",

1637

1349

raise KeyError()

1638

1350

1639

1351

def __getattribute__(self, name):

1640

if name == '_pipe':

1352

if(name == '_pipe'):

1641

1353

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

1642

1354

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

1643

1355

data = self._pipe.recv()

1650

1362

return func

1651

1363

1652

1364

def __setattr__(self, name, value):

1653

if name == '_pipe':

1365

if(name == '_pipe'):

1654

1366

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

1655

1367

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

1656

1368

1369

class ClientDBusTransitional(ClientDBus):

1370

__metaclass__ = AlternateDBusNamesMetaclass

1657

1371

1658

1372

class ClientHandler(socketserver.BaseRequestHandler, object):

1659

1373

"""A class to handle client connections.

1742

1456

client.Rejected("Disabled")

1743

1457

return

1744

1458

1745

if client.approved or not client.approval_delay:

1459

if client._approved or not client.approval_delay:

1746

1460

#We are approved or approval is disabled

1747

1461

break

1748

elif client.approved is None:

1462

elif client._approved is None:

1749

1463

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

1750

1464

client.name)

1751

1465

if self.server.use_dbus:

1764

1478

#wait until timeout or approved

1765

1479

time = datetime.datetime.now()

1766

1480

client.changedstate.acquire()

1767

client.changedstate.wait(

1768

float(timedelta_to_milliseconds(delay)

1769

/ 1000))

1481

(client.changedstate.wait

1482

(float(client._timedelta_to_milliseconds(delay)

1483

/ 1000)))

1770

1484

client.changedstate.release()

1771

1485

time2 = datetime.datetime.now()

1772

1486

if (time2 - time) >= delay:

1788

1502

try:

1789

1503

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

1790

1504

except gnutls.errors.GNUTLSError as error:

1791

logger.warning("gnutls send failed",

1792

exc_info=error)

1505

logger.warning("gnutls send failed")

1793

1506

return

1794

1507

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

1795

1508

sent, len(client.secret)

1798

1511

1799

1512

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

1800

1513

# bump the timeout using extended_timeout

1801

client.bump_timeout(client.extended_timeout)

1514

client.checked_ok(client.extended_timeout)

1802

1515

if self.server.use_dbus:

1803

1516

# Emit D-Bus signal

1804

1517

client.GotSecret()

1809

1522

try:

1810

1523

session.bye()

1811

1524

except gnutls.errors.GNUTLSError as error:

1812

logger.warning("GnuTLS bye failed",

1813

exc_info=error)

1525

logger.warning("GnuTLS bye failed")

1814

1526

1815

1527

@staticmethod

1816

1528

def peer_certificate(session):

1872

1584

# Convert the buffer to a Python bytestring

1873

1585

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

1874

1586

# Convert the bytestring to hexadecimal notation

1875

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

1587

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

1876

1588

return hex_fpr

1877

1589

1878

1590

1881

1593

def sub_process_main(self, request, address):

1882

1594

try:

1883

1595

self.finish_request(request, address)

1884

except Exception:

1596

except:

1885

1597

self.handle_error(request, address)

1886

1598

self.close_request(request)

1887

1599

1888

1600

def process_request(self, request, address):

1889

1601

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

1890

1602

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

1891

args = (request, address))

1603

args = (request,

1604

address))

1892

1605

proc.start()

1893

1606

return proc

1894

1607

1922

1635

use_ipv6: Boolean; to use IPv6 or not

1923

1636

"""

1924

1637

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

"""

1638

interface=None, use_ipv6=True):

1929

1639

self.interface = interface

1930

1640

if use_ipv6:

1931

1641

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

1642

socketserver.TCPServer.__init__(self, server_address,

1959

1643

RequestHandlerClass)

1960

1961

1644

def server_bind(self):

1962

1645

"""This overrides the normal server_bind() function

1963

1646

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

1971

1654

try:

1972

1655

self.socket.setsockopt(socket.SOL_SOCKET,

1973

1656

SO_BINDTODEVICE,

1974

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

1657

str(self.interface

1658

+ '\0'))

1975

1659

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:

1660

if error[0] == errno.EPERM:

1661

logger.error("No permission to"

1662

" bind to interface %s",

1663

self.interface)

1664

elif error[0] == errno.ENOPROTOOPT:

1980

1665

logger.error("SO_BINDTODEVICE not available;"

1981

1666

" cannot bind to interface %s",

1982

1667

self.interface)

1983

elif error.errno == errno.ENODEV:

1984

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

1985

" cannot bind", self.interface)

1986

1668

else:

1987

1669

raise

1988

1670

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

1991

1673

if self.address_family == socket.AF_INET6:

1992

1674

any_address = "::" # in6addr_any

1993

1675

else:

1994

any_address = "0.0.0.0" # INADDR_ANY

1676

any_address = socket.INADDR_ANY

1995

1677

self.server_address = (any_address,

1996

1678

self.server_address[1])

1997

1679

elif not self.server_address[1]:

2018

1700

"""

2019

1701

def __init__(self, server_address, RequestHandlerClass,

2020

1702

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

2021

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

1703

gnutls_priority=None, use_dbus=True):

2022

1704

self.enabled = False

2023

1705

self.clients = clients

2024

1706

if self.clients is None:

2028

1710

IPv6_TCPServer.__init__(self, server_address,

2029

1711

RequestHandlerClass,

2030

1712

interface = interface,

2031

use_ipv6 = use_ipv6,

2032

socketfd = socketfd)

1713

use_ipv6 = use_ipv6)

2033

1714

def server_activate(self):

2034

1715

if self.enabled:

2035

1716

return socketserver.TCPServer.server_activate(self)

2048

1729

2049

1730

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

2050

1731

proc = None, client_object=None):

1732

condition_names = {

1733

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

1734

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

1735

# blocking).

1736

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

1737

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

1738

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

1739

# broken, usually for pipes and

1740

# sockets).

1741

}

1742

conditions_string = ' | '.join(name

1743

for cond, name in

1744

condition_names.iteritems()

1745

if cond & condition)

2051

1746

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

2052

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

1747

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

2053

1748

# Wait for other process to exit

2054

1749

proc.join()

2055

1750

return False

2113

1808

return True

2114

1809

2115

1810

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

1811

def string_to_delta(interval):

2216

1812

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

2217

1813

2228

1824

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

2229

1825

datetime.timedelta(0, 330)

2230

1826

"""

2231

2232

try:

2233

return rfc3339_duration_to_delta(interval)

2234

except ValueError:

2235

pass

2236

2237

1827

timevalue = datetime.timedelta(0)

2238

1828

for s in interval.split():

2239

1829

try:

2250

1840

elif suffix == "w":

2251

1841

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

2252

1842

else:

2253

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

2254

.format(suffix))

1843

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

2255

1844

except (ValueError, IndexError) as e:

2256

1845

raise ValueError(*(e.args))

2257

1846

timevalue += delta

2258

1847

return timevalue

2259

1848

2260

1849

1850

def if_nametoindex(interface):

1851

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

1852

1853

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

1854

global if_nametoindex

1855

try:

1856

if_nametoindex = (ctypes.cdll.LoadLibrary

1857

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

1858

.if_nametoindex)

1859

except (OSError, AttributeError):

1860

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

1861

def if_nametoindex(interface):

1862

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

1863

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

1864

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

1865

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1866

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

1867

interface))

1868

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

1869

ifreq[16:20])[0]

1870

return interface_index

1871

return if_nametoindex(interface)

1872

1873

2261

1874

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

2262

1875

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

2263

1876

2271

1884

sys.exit()

2272

1885

if not noclose:

2273

1886

# Close all standard open file descriptors

2274

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

1887

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

2275

1888

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

2276

1889

raise OSError(errno.ENODEV,

2277

"{0} not a character device"

2278

.format(os.devnull))

1890

"%s not a character device"

1891

% os.path.devnull)

2279

1892

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

2280

1893

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

2281

1894

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

2290

1903

2291

1904

parser = argparse.ArgumentParser()

2292

1905

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

2293

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

1906

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

2294

1907

help="show version number and exit")

2295

1908

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

2296

1909

help="Bind to interface IF")

2302

1915

help="Run self-test")

2303

1916

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

2304

1917

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

2305

" to terminal", default=None)

1918

" to terminal")

2306

1919

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

2307

1920

help="Debug level for stdout output")

2308

1921

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

2315

1928

" files")

2316

1929

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

2317

1930

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

2318

" system bus interface", default=None)

1931

" system bus interface")

2319

1932

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

2320

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

2321

default=None)

1933

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

2322

1934

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

1935

dest="restore",

1936

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

2140

setting not in special_settings

2141

else special_settings[setting]

2142

(clientname)))

2143

for setting, value

2144

in client_config.items(clientname)))

2145

for clientname in client_config.sections())

2146

2542

2147

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.

2148

clients_data = []

2149

2150

# Get client data and settings from last running state.

2554

2151

if server_settings["restore"]:

2555

2152

try:

2556

2153

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

2557

clients_data, old_client_settings = (pickle.load

2558

(stored_state))

2154

clients_data, old_client_settings = (

2155

pickle.load(stored_state))

2559

2156

os.remove(stored_state_path)

2560

2157

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)

2158

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

2159

.format(e))

2160

if e.errno != errno.ENOENT:

2567

2161

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))

2162

2163

for client in clients_data:

2164

client_name = client["name"]

2165

2166

# Decide which value to use after restoring saved state.

2167

# We have three different values: Old config file,

2168

# new config file, and saved state.

2169

# New config value takes precedence if it differs from old

2170

# config value, otherwise use saved state.

2171

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

2622

2172

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)

2173

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

2174

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

2175

# attribute)

2176

if (name != "secret" and

2177

value != old_client_settings[client_name][name]):

2178

setattr(client, name, value)

2179

except KeyError:

2180

pass

2181

2182

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

2183

# if its last checker was sucessful. Clients who checkers

2184

# failed before we stored it state is asumed to had failed

2185

# checker during downtime.

2186

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

2187

if ((datetime.datetime.utcnow()

2188

- client["last_checked_ok"]) > client["interval"]):

2189

if client["last_checker_status"] != 0:

2190

client["enabled"] = False

2191

else:

2192

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

2193

+ client["timeout"])

2194

2195

client["changedstate"] = (multiprocessing_manager

2196

.Condition(multiprocessing_manager

2197

.Lock()))

2198

if use_dbus:

2199

new_client = ClientDBusTransitional.__new__(

2200

ClientDBusTransitional)

2201

tcp_server.clients[client_name] = new_client

2202

new_client.bus = bus

2203

for name, value in client.iteritems():

2204

setattr(new_client, name, value)

2205

new_client._approvals_pending = 0

2206

new_client.add_to_dbus()

2207

else:

2208

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

2209

for name, value in client.iteritems():

2210

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

2211

2212

tcp_server.clients[client_name].decrypt_secret(

2213

client_settings[client_name]["secret"])

2214

2215

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

2216

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

2217

del tcp_server.clients[clientname]

2218

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

2219

tcp_server.clients[clientname] = client_class(name

2220

= clientname,

2221

config =

2222

client_settings

2223

[clientname])

2647

2224

2648

2225

if not tcp_server.clients:

2649

2226

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

2227

2228

if not debug:

2229

try:

2230

with pidfile:

2231

pid = os.getpid()

2232

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

2233

del pidfile

2234

except IOError:

2235

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

2236

pidfilename, pid)

2237

except NameError:

2238

# "pidfile" was never created

2239

pass

2661

2240

del pidfilename

2241

2242

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

2662

2243

2663

2244

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

2664

2245

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

2665

2246

2666

2247

if use_dbus:

2667

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

2668

"se.bsnet.fukt.Mandos"})

2669

class MandosDBusService(DBusObjectWithProperties):

2248

class MandosDBusService(dbus.service.Object):

2670

2249

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

2671

2250

def __init__(self):

2672

2251

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

2673

2252

_interface = "se.recompile.Mandos"

2674

2253

2675

@dbus_interface_annotations(_interface)

2676

def _foo(self):

2677

return { "org.freedesktop.DBus.Property"

2678

".EmitsChangedSignal":

2679

"false"}

2680

2681

2254

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

2682

2255

def ClientAdded(self, objpath):

2683

2256

"D-Bus signal"

2725

2298

2726

2299

del _interface

2727

2300

2728

mandos_dbus_service = MandosDBusService()

2301

class MandosDBusServiceTransitional(MandosDBusService):

2302

__metaclass__ = AlternateDBusNamesMetaclass

2303

mandos_dbus_service = MandosDBusServiceTransitional()

2729

2304

2730

2305

def cleanup():

2731

2306

"Cleanup function; run on exit"

2732

2307

service.cleanup()

2733

2308

2734

2309

multiprocessing.active_children()

2735

wnull.close()

2736

2310

if not (tcp_server.clients or client_settings):

2737

2311

return

2738

2312

2739

2313

# Store client before exiting. Secrets are encrypted with key

2740

2314

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

2741

2315

# 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

2316

clients = []

2317

for client in tcp_server.clients.itervalues():

2318

client.encrypt_secret(

2319

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

2320

2321

client_dict = {}

2322

2323

# A list of attributes that will not be stored when

2324

# shutting down.

2325

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

2326

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

2327

exclude.add(name)

2328

2329

client_dict["encrypted_secret"] = client.encrypted_secret

2330

for attr in client.client_structure:

2331

if attr not in exclude:

2332

client_dict[attr] = getattr(client, attr)

2333

2334

clients.append(client_dict)

2335

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

2336

2767

2337

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:

2338

with os.fdopen(os.open(stored_state_path,

2339

os.O_CREAT|os.O_WRONLY|os.O_TRUNC,

2340

stat.S_IRUSR | stat.S_IWUSR),

2341

"wb") as stored_state:

2772

2342

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

2343

except IOError as e:

2344

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

2345

.format(e))

2346

if e.errno != errno.ENOENT:

2347

raise

2348

2789

2349

# Delete all clients, and settings from config

2790

2350

while tcp_server.clients:

2791

2351

name, client = tcp_server.clients.popitem()

2809

2369

# Need to initiate checking of clients

2810

2370

if client.enabled:

2811

2371

client.init_checker()

2372

2812

2373

2813

2374

tcp_server.enable()

2814

2375

tcp_server.server_activate()

2817

2378

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

2818

2379

if use_ipv6:

2819

2380

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

2820

" flowinfo %d, scope_id %d",

2821

*tcp_server.socket.getsockname())

2381

" flowinfo %d, scope_id %d"

2382

% tcp_server.socket.getsockname())

2822

2383

else: # IPv4

2823

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

2824

*tcp_server.socket.getsockname())

2384

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

2385

% tcp_server.socket.getsockname())

2825

2386

2826

2387

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

2827

2388

2830

2391

try:

2831

2392

service.activate()

2832

2393

except dbus.exceptions.DBusException as error:

2833

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

2394

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

2834

2395

cleanup()

2835

2396

sys.exit(1)

2836

2397

# End of Avahi example code

2843

2404

logger.debug("Starting main loop")

2844

2405

main_loop.run()

2845

2406

except AvahiError as error:

2846

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

2407

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

2847

2408

cleanup()

2848

2409

sys.exit(1)

2849

2410

except KeyboardInterrupt:

2854

2415

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

2855

2416

cleanup()

2856

2417

2418

2857

2419

if __name__ == '__main__':

2858

2420

main()