/mandos/trunk : revision 521.1.1

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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 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 GnuPGInterface

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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 = "1.5.3"

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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.gnupg = GnuPGInterface.GnuPG()

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

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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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

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'--quiet',

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'--no-use-agent'])

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def __enter__(self):

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return self

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

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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

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topdown = False):

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for filename in files:

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

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for dirname in dirs:

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

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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

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

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

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def encrypt(self, data, password):

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

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with open(os.devnull, "w") as devnull:

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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ciphertext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return ciphertext

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def decrypt(self, data, password):

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

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with open(os.devnull, "w") as devnull:

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try:

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

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

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attach_fhs={'stderr': devnull})

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

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f.write(data)

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

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decrypted_plaintext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return decrypted_plaintext

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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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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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"""

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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": "5m",

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"extended_timeout": "15m",

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"interval": "2m",

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

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"host": "",

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"approval_delay": "0s",

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"approval_duration": "1s",

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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"])),

502

"rb") as secfile:

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

504

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):

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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."""

523

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self.name = name

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# adding all client settings

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for setting, value in settings.iteritems():

526

setattr(self, setting, value)

527

528

if self.enabled:

529

if not hasattr(self, "last_enabled"):

530

self.last_enabled = datetime.datetime.utcnow()

531

if not hasattr(self, "expires"):

532

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

533

+ self.timeout)

534

else:

535

self.last_enabled = None

536

self.expires = None

537

353

if config is None:

354

config = {}

538

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

539

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# Uppercase and remove spaces from fingerprint for later

540

357

# comparison purposes with return value from the fingerprint()

541

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# function

359

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

360

.replace(" ", ""))

542

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

543

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

544

datetime.datetime.utcnow())

545

546

# attributes specific for this server instance

362

if "secret" in config:

363

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

364

elif "secfile" in config:

365

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

366

(config["secfile"])),

367

"rb") as secfile:

368

self.secret = secfile.read()

369

else:

370

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

371

% 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()

377

self.last_checked_ok = None

378

self.last_checker_status = None

379

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

380

self.extended_timeout = string_to_delta(config

381

["extended_timeout"])

382

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

547

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self.checker = None

548

384

self.checker_initiator_tag = None

549

385

self.disable_initiator_tag = None

386

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

550

387

self.checker_callback_tag = None

388

self.checker_command = config["checker"]

551

389

self.current_checker_command = None

552

self.approved = None

390

self._approved = None

391

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

392

True)

553

393

self.approvals_pending = 0

394

self.approval_delay = string_to_delta(

395

config["approval_delay"])

396

self.approval_duration = string_to_delta(

397

config["approval_duration"])

554

398

self.changedstate = (multiprocessing_manager

555

399

.Condition(multiprocessing_manager

556

400

.Lock()))

557

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()

559

403

if not attr.startswith("_")]

560

404

self.client_structure.append("client_structure")

561

405

406

562

407

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

563

408

lambda obj:

564

409

isinstance(obj,

576

421

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

577

422

# Already enabled

578

423

return

424

self.send_changedstate()

579

425

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

580

426

self.enabled = True

581

427

self.last_enabled = datetime.datetime.utcnow()

582

428

self.init_checker()

583

self.send_changedstate()

584

429

585

430

def disable(self, quiet=True):

586

431

"""Disable this client."""

587

432

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

588

433

return False

589

434

if not quiet:

435

self.send_changedstate()

436

if not quiet:

590

437

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

591

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

438

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

592

439

gobject.source_remove(self.disable_initiator_tag)

593

440

self.disable_initiator_tag = None

594

441

self.expires = None

595

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

442

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

596

443

gobject.source_remove(self.checker_initiator_tag)

597

444

self.checker_initiator_tag = None

598

445

self.stop_checker()

599

446

self.enabled = False

600

if not quiet:

601

self.send_changedstate()

602

447

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

603

448

return False

604

449

605

450

def __del__(self):

606

451

self.disable()

607

452

608

453

def init_checker(self):

609

454

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

610

455

# and every interval from then on.

611

if self.checker_initiator_tag is not None:

612

gobject.source_remove(self.checker_initiator_tag)

613

456

self.checker_initiator_tag = (gobject.timeout_add

614

457

(self.interval_milliseconds(),

615

458

self.start_checker))

616

459

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

617

if self.disable_initiator_tag is not None:

618

gobject.source_remove(self.disable_initiator_tag)

619

460

self.disable_initiator_tag = (gobject.timeout_add

620

461

(self.timeout_milliseconds(),

621

462

self.disable))

622

463

# Also start a new checker *right now*.

623

464

self.start_checker()

624

465

466

625

467

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

626

468

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

627

469

self.checker_callback_tag = None

628

470

self.checker = None

629

471

if os.WIFEXITED(condition):

630

self.last_checker_status = os.WEXITSTATUS(condition)

472

self.last_checker_status = os.WEXITSTATUS(condition)

631

473

if self.last_checker_status == 0:

632

474

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

633

475

vars(self))

640

482

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

641

483

vars(self))

642

484

643

def checked_ok(self):

644

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

645

self.last_checked_ok = datetime.datetime.utcnow()

646

self.last_checker_status = 0

647

self.bump_timeout()

648

649

def bump_timeout(self, timeout=None):

650

"""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

"""

651

491

if timeout is None:

652

492

timeout = self.timeout

493

self.last_checked_ok = datetime.datetime.utcnow()

653

494

if self.disable_initiator_tag is not None:

654

495

gobject.source_remove(self.disable_initiator_tag)

655

self.disable_initiator_tag = None

656

496

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

657

497

self.disable_initiator_tag = (gobject.timeout_add

658

(timedelta_to_milliseconds

498

(_timedelta_to_milliseconds

659

499

(timeout), self.disable))

660

500

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

661

501

668

508

If a checker already exists, leave it running and do

669

509

nothing."""

670

510

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

671

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

672

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

673

# would inevitably timeout, since no checker would get a

674

# 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

675

515

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

676

516

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

677

517

# should be.

691

531

self.current_checker_command)

692

532

# Start a new checker if needed

693

533

if self.checker is None:

694

# Escape attributes for the shell

695

escaped_attrs = dict(

696

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

697

for attr in

698

self.runtime_expansions)

699

534

try:

700

command = self.checker_command % escaped_attrs

701

except TypeError as error:

702

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

703

self.checker_command, exc_info=error)

704

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

705

553

self.current_checker_command = command

706

554

try:

707

555

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

713

561

self.checker = subprocess.Popen(command,

714

562

close_fds=True,

715

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.

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)

716

574

except OSError as error:

717

logger.error("Failed to start subprocess",

718

exc_info=error)

719

self.checker_callback_tag = (gobject.child_watch_add

720

(self.checker.pid,

721

self.checker_callback,

722

data=command))

723

# The checker may have completed before the gobject

724

# watch was added. Check for this.

725

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

726

if pid:

727

gobject.source_remove(self.checker_callback_tag)

728

self.checker_callback(pid, status, command)

575

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

576

error)

729

577

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

730

578

return True

731

579

738

586

return

739

587

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

740

588

try:

741

self.checker.terminate()

589

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

742

590

#time.sleep(0.5)

743

591

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

744

# self.checker.kill()

592

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

745

593

except OSError as error:

746

594

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

747

595

raise

748

596

self.checker = None

749

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

750

648

751

649

def dbus_service_property(dbus_interface, signature="v",

752

650

access="readwrite", byte_arrays=False):

764

662

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

765

663

if byte_arrays and signature != "ay":

766

664

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

767

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

665

" signature %r" % signature)

768

666

def decorator(func):

769

667

func._dbus_is_property = True

770

668

func._dbus_interface = dbus_interface

778

676

return decorator

779

677

780

678

781

def dbus_interface_annotations(dbus_interface):

782

"""Decorator for marking functions returning interface annotations

783

784

Usage:

785

786

@dbus_interface_annotations("org.example.Interface")

787

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

788

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

789

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

790

"false"}

791

"""

792

def decorator(func):

793

func._dbus_is_interface = True

794

func._dbus_interface = dbus_interface

795

func._dbus_name = dbus_interface

796

return func

797

return decorator

798

799

800

def dbus_annotations(annotations):

801

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

802

Usage:

803

804

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

805

access="r")

806

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

807

"org.freedesktop.DBus.Property."

808

"EmitsChangedSignal": "false"})

809

def Property_dbus_property(self):

810

return dbus.Boolean(False)

811

"""

812

def decorator(func):

813

func._dbus_annotations = annotations

814

return func

815

return decorator

816

817

818

679

class DBusPropertyException(dbus.exceptions.DBusException):

819

680

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

820

681

"""

843

704

"""

844

705

845

706

@staticmethod

846

def _is_dbus_thing(thing):

847

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

848

849

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

850

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

851

"""

852

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

853

False)

707

def _is_dbus_property(obj):

708

return getattr(obj, "_dbus_is_property", False)

854

709

855

def _get_all_dbus_things(self, thing):

710

def _get_all_dbus_properties(self):

856

711

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

857

712

"""

858

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

859

name),

860

athing.__get__(self))

713

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

861

714

for cls in self.__class__.__mro__

862

for name, athing in

863

inspect.getmembers(cls,

864

self._is_dbus_thing(thing)))

715

for name, prop in

716

inspect.getmembers(cls, self._is_dbus_property))

865

717

866

718

def _get_dbus_property(self, interface_name, property_name):

867

719

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

869

721

"""

870

722

for cls in self.__class__.__mro__:

871

723

for name, value in (inspect.getmembers

872

(cls,

873

self._is_dbus_thing("property"))):

724

(cls, self._is_dbus_property)):

874

725

if (value._dbus_name == property_name

875

726

and value._dbus_interface == interface_name):

876

727

return value.__get__(self)

905

756

# signatures other than "ay".

906

757

if prop._dbus_signature != "ay":

907

758

raise ValueError

908

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

909

for byte in value))

759

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

760

for byte in value))

910

761

prop(value)

911

762

912

763

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

917

768

918

769

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

919

770

"""

920

properties = {}

921

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

771

all = {}

772

for name, prop in self._get_all_dbus_properties():

922

773

if (interface_name

923

774

and interface_name != prop._dbus_interface):

924

775

# Interface non-empty but did not match

928

779

continue

929

780

value = prop()

930

781

if not hasattr(value, "variant_level"):

931

properties[name] = value

782

all[name] = value

932

783

continue

933

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

934

value.variant_level+1)

935

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")

936

787

937

788

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

938

789

out_signature="s",

939

790

path_keyword='object_path',

940

791

connection_keyword='connection')

941

792

def Introspect(self, object_path, connection):

942

"""Overloading of standard D-Bus method.

943

944

Inserts property tags and interface annotation tags.

793

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

945

794

"""

946

795

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

947

796

connection)

954

803

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

955

804

return e

956

805

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

957

# Add property tags

958

806

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

959

807

for name, prop

960

in self._get_all_dbus_things("property")

808

in self._get_all_dbus_properties()

961

809

if prop._dbus_interface

962

810

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

963

811

if_tag.appendChild(tag)

964

# Add annotation tags

965

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

966

for tag in if_tag.getElementsByTagName(typ):

967

annots = dict()

968

for name, prop in (self.

969

_get_all_dbus_things(typ)):

970

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

971

and prop._dbus_interface

972

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

973

annots.update(getattr

974

(prop,

975

"_dbus_annotations",

976

{}))

977

for name, value in annots.iteritems():

978

ann_tag = document.createElement(

979

"annotation")

980

ann_tag.setAttribute("name", name)

981

ann_tag.setAttribute("value", value)

982

tag.appendChild(ann_tag)

983

# Add interface annotation tags

984

for annotation, value in dict(

985

itertools.chain.from_iterable(

986

annotations().iteritems()

987

for name, annotations in

988

self._get_all_dbus_things("interface")

989

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

990

)).iteritems():

991

ann_tag = document.createElement("annotation")

992

ann_tag.setAttribute("name", annotation)

993

ann_tag.setAttribute("value", value)

994

if_tag.appendChild(ann_tag)

995

812

# Add the names to the return values for the

996

813

# "org.freedesktop.DBus.Properties" methods

997

814

if (if_tag.getAttribute("name")

1012

829

except (AttributeError, xml.dom.DOMException,

1013

830

xml.parsers.expat.ExpatError) as error:

1014

831

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

1015

exc_info=error)

832

error)

1016

833

return xmlstring

1017

834

1018

835

1023

840

return dbus.String(dt.isoformat(),

1024

841

variant_level=variant_level)

1025

842

1026

1027

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1028

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

1029

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

1030

interface names according to the "alt_interface_names" mapping.

1031

Usage:

1032

1033

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

1034

"net.example.AlternateInterface"})

1035

class SampleDBusObject(dbus.service.Object):

1036

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

1037

def SampleDBusMethod():

1038

pass

1039

1040

The above "SampleDBusMethod" on "SampleDBusObject" will be

1041

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

1042

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

1043

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

1044

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

1045

1046

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

1047

(from DBusObjectWithProperties) and interfaces (from the

1048

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.

1049

847

"""

1050

def wrapper(cls):

1051

for orig_interface_name, alt_interface_name in (

1052

alt_interface_names.iteritems()):

1053

attr = {}

1054

interface_names = set()

1055

# Go though all attributes of the class

1056

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):

1057

855

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

1058

856

# with the wrong interface name

1059

857

if (not hasattr(attribute, "_dbus_interface")

1060

858

or not attribute._dbus_interface

1061

.startswith(orig_interface_name)):

859

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

1062

860

continue

1063

861

# Create an alternate D-Bus interface name based on

1064

862

# the current name

1065

863

alt_interface = (attribute._dbus_interface

1066

.replace(orig_interface_name,

1067

alt_interface_name))

1068

interface_names.add(alt_interface)

864

.replace("se.recompile.Mandos",

865

"se.bsnet.fukt.Mandos"))

1069

866

# Is this a D-Bus signal?

1070

867

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

1071

868

# Extract the original non-method function by

1086

883

nonmethod_func.func_name,

1087

884

nonmethod_func.func_defaults,

1088

885

nonmethod_func.func_closure)))

1089

# Copy annotations, if any

1090

try:

1091

new_function._dbus_annotations = (

1092

dict(attribute._dbus_annotations))

1093

except AttributeError:

1094

pass

1095

886

# Define a creator of a function to call both the

1096

# original and alternate functions, so both the

1097

# original and alternate signals gets sent when

1098

# the function is called

887

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

888

# signals gets sent when the function is called

1099

889

def fixscope(func1, func2):

1100

890

"""This function is a scope container to pass

1101

891

func1 and func2 to the "call_both" function

1108

898

return call_both

1109

899

# Create the "call_both" function and add it to

1110

900

# the class

1111

attr[attrname] = fixscope(attribute, new_function)

901

attr[attrname] = fixscope(attribute,

902

new_function)

1112

903

# Is this a D-Bus method?

1113

904

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

1114

905

# Create a new, but exactly alike, function

1125

916

attribute.func_name,

1126

917

attribute.func_defaults,

1127

918

attribute.func_closure)))

1128

# Copy annotations, if any

1129

try:

1130

attr[attrname]._dbus_annotations = (

1131

dict(attribute._dbus_annotations))

1132

except AttributeError:

1133

pass

1134

919

# Is this a D-Bus property?

1135

920

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

1136

921

# Create a new, but exactly alike, function

1150

935

attribute.func_name,

1151

936

attribute.func_defaults,

1152

937

attribute.func_closure)))

1153

# Copy annotations, if any

1154

try:

1155

attr[attrname]._dbus_annotations = (

1156

dict(attribute._dbus_annotations))

1157

except AttributeError:

1158

pass

1159

# Is this a D-Bus interface?

1160

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

1161

# Create a new, but exactly alike, function

1162

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

1163

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

1164

# to the class.

1165

attr[attrname] = (dbus_interface_annotations

1166

(alt_interface)

1167

(types.FunctionType

1168

(attribute.func_code,

1169

attribute.func_globals,

1170

attribute.func_name,

1171

attribute.func_defaults,

1172

attribute.func_closure)))

1173

if deprecate:

1174

# Deprecate all alternate interfaces

1175

iname="_AlternateDBusNames_interface_annotation{0}"

1176

for interface_name in interface_names:

1177

@dbus_interface_annotations(interface_name)

1178

def func(self):

1179

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

1180

"true" }

1181

# Find an unused name

1182

for aname in (iname.format(i)

1183

for i in itertools.count()):

1184

if aname not in attr:

1185

attr[aname] = func

1186

break

1187

if interface_names:

1188

# Replace the class with a new subclass of it with

1189

# methods, signals, etc. as created above.

1190

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

1191

(cls,), attr)

1192

return cls

1193

return wrapper

1194

1195

1196

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

1197

"se.bsnet.fukt.Mandos"})

938

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

939

1198

940

class ClientDBus(Client, DBusObjectWithProperties):

1199

941

"""A Client class using D-Bus

1200

942

1210

952

1211

953

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

1212

954

self.bus = bus

955

self._approvals_pending = 0

1213

956

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

957

self.add_to_dbus()

958

959

def add_to_dbus(self):

1214

960

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

1215

961

# the D-Bus

1216

962

client_object_name = unicode(self.name).translate(

1220

966

("/clients/" + client_object_name))

1221

967

DBusObjectWithProperties.__init__(self, self.bus,

1222

968

self.dbus_object_path)

1223

969

1224

970

def notifychangeproperty(transform_func,

1225

971

dbus_name, type_func=lambda x: x,

1226

972

variant_level=1):

1227

973

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

1228

974

its changes to DBus.

1229

975

1230

976

transform_fun: Function that takes a value and a variant_level

1231

977

and transforms it to a D-Bus type.

1232

978

dbus_name: D-Bus name of the variable

1249

995

1250

996

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

1251

997

998

1252

999

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1253

1000

approvals_pending = notifychangeproperty(dbus.Boolean,

1254

1001

"ApprovalPending",

1261

1008

checker is not None)

1262

1009

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1263

1010

"LastCheckedOK")

1264

last_checker_status = notifychangeproperty(dbus.Int16,

1265

"LastCheckerStatus")

1266

1011

last_approval_request = notifychangeproperty(

1267

1012

datetime_to_dbus, "LastApprovalRequest")

1268

1013

approved_by_default = notifychangeproperty(dbus.Boolean,

1269

1014

"ApprovedByDefault")

1270

approval_delay = notifychangeproperty(dbus.UInt64,

1015

approval_delay = notifychangeproperty(dbus.UInt16,

1271

1016

"ApprovalDelay",

1272

1017

type_func =

1273

timedelta_to_milliseconds)

1018

_timedelta_to_milliseconds)

1274

1019

approval_duration = notifychangeproperty(

1275

dbus.UInt64, "ApprovalDuration",

1276

type_func = timedelta_to_milliseconds)

1020

dbus.UInt16, "ApprovalDuration",

1021

type_func = _timedelta_to_milliseconds)

1277

1022

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

1278

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

1023

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

1279

1024

type_func =

1280

timedelta_to_milliseconds)

1025

_timedelta_to_milliseconds)

1281

1026

extended_timeout = notifychangeproperty(

1282

dbus.UInt64, "ExtendedTimeout",

1283

type_func = timedelta_to_milliseconds)

1284

interval = notifychangeproperty(dbus.UInt64,

1027

dbus.UInt16, "ExtendedTimeout",

1028

type_func = _timedelta_to_milliseconds)

1029

interval = notifychangeproperty(dbus.UInt16,

1285

1030

"Interval",

1286

1031

type_func =

1287

timedelta_to_milliseconds)

1032

_timedelta_to_milliseconds)

1288

1033

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

1289

1034

1290

1035

del notifychangeproperty

1332

1077

return r

1333

1078

1334

1079

def _reset_approved(self):

1335

self.approved = None

1080

self._approved = None

1336

1081

return False

1337

1082

1338

1083

def approve(self, value=True):

1339

self.approved = value

1340

gobject.timeout_add(timedelta_to_milliseconds

1084

self.send_changedstate()

1085

self._approved = value

1086

gobject.timeout_add(_timedelta_to_milliseconds

1341

1087

(self.approval_duration),

1342

1088

self._reset_approved)

1343

self.send_changedstate()

1089

1344

1090

1345

1091

## D-Bus methods, signals & properties

1346

1092

_interface = "se.recompile.Mandos.Client"

1347

1093

1348

## Interfaces

1349

1350

@dbus_interface_annotations(_interface)

1351

def _foo(self):

1352

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

1353

"false"}

1354

1355

1094

## Signals

1356

1095

1357

1096

# CheckerCompleted - signal

1456

1195

access="readwrite")

1457

1196

def ApprovalDuration_dbus_property(self, value=None):

1458

1197

if value is None: # get

1459

return dbus.UInt64(timedelta_to_milliseconds(

1198

return dbus.UInt64(_timedelta_to_milliseconds(

1460

1199

self.approval_duration))

1461

1200

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

1462

1201

1476

1215

def Host_dbus_property(self, value=None):

1477

1216

if value is None: # get

1478

1217

return dbus.String(self.host)

1479

self.host = unicode(value)

1218

self.host = value

1480

1219

1481

1220

# Created - property

1482

1221

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

1483

1222

def Created_dbus_property(self):

1484

return datetime_to_dbus(self.created)

1223

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

1485

1224

1486

1225

# LastEnabled - property

1487

1226

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

1508

1247

return

1509

1248

return datetime_to_dbus(self.last_checked_ok)

1510

1249

1511

# LastCheckerStatus - property

1512

@dbus_service_property(_interface, signature="n",

1513

access="read")

1514

def LastCheckerStatus_dbus_property(self):

1515

return dbus.Int16(self.last_checker_status)

1516

1517

1250

# Expires - property

1518

1251

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

1519

1252

def Expires_dbus_property(self):

1530

1263

def Timeout_dbus_property(self, value=None):

1531

1264

if value is None: # get

1532

1265

return dbus.UInt64(self.timeout_milliseconds())

1533

old_timeout = self.timeout

1534

1266

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

1535

# Reschedule disabling

1536

if self.enabled:

1537

now = datetime.datetime.utcnow()

1538

self.expires += self.timeout - old_timeout

1539

if self.expires <= now:

1540

# The timeout has passed

1541

self.disable()

1542

else:

1543

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

1544

is None):

1545

return

1546

gobject.source_remove(self.disable_initiator_tag)

1547

self.disable_initiator_tag = (

1548

gobject.timeout_add(

1549

timedelta_to_milliseconds(self.expires - now),

1550

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))

1551

1287

1552

1288

# ExtendedTimeout - property

1553

1289

@dbus_service_property(_interface, signature="t",

1566

1302

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

1567

1303

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

1568

1304

return

1569

if self.enabled:

1570

# Reschedule checker run

1571

gobject.source_remove(self.checker_initiator_tag)

1572

self.checker_initiator_tag = (gobject.timeout_add

1573

(value, self.start_checker))

1574

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

1575

1310

1576

1311

# Checker - property

1577

1312

@dbus_service_property(_interface, signature="s",

1579

1314

def Checker_dbus_property(self, value=None):

1580

1315

if value is None: # get

1581

1316

return dbus.String(self.checker_command)

1582

self.checker_command = unicode(value)

1317

self.checker_command = value

1583

1318

1584

1319

# CheckerRunning - property

1585

1320

@dbus_service_property(_interface, signature="b",

1614

1349

raise KeyError()

1615

1350

1616

1351

def __getattribute__(self, name):

1617

if name == '_pipe':

1352

if(name == '_pipe'):

1618

1353

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

1619

1354

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

1620

1355

data = self._pipe.recv()

1627

1362

return func

1628

1363

1629

1364

def __setattr__(self, name, value):

1630

if name == '_pipe':

1365

if(name == '_pipe'):

1631

1366

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

1632

1367

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

1633

1368

1369

class ClientDBusTransitional(ClientDBus):

1370

__metaclass__ = AlternateDBusNamesMetaclass

1634

1371

1635

1372

class ClientHandler(socketserver.BaseRequestHandler, object):

1636

1373

"""A class to handle client connections.

1719

1456

client.Rejected("Disabled")

1720

1457

return

1721

1458

1722

if client.approved or not client.approval_delay:

1459

if client._approved or not client.approval_delay:

1723

1460

#We are approved or approval is disabled

1724

1461

break

1725

elif client.approved is None:

1462

elif client._approved is None:

1726

1463

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

1727

1464

client.name)

1728

1465

if self.server.use_dbus:

1741

1478

#wait until timeout or approved

1742

1479

time = datetime.datetime.now()

1743

1480

client.changedstate.acquire()

1744

client.changedstate.wait(

1745

float(timedelta_to_milliseconds(delay)

1746

/ 1000))

1481

(client.changedstate.wait

1482

(float(client._timedelta_to_milliseconds(delay)

1483

/ 1000)))

1747

1484

client.changedstate.release()

1748

1485

time2 = datetime.datetime.now()

1749

1486

if (time2 - time) >= delay:

1765

1502

try:

1766

1503

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

1767

1504

except gnutls.errors.GNUTLSError as error:

1768

logger.warning("gnutls send failed",

1769

exc_info=error)

1505

logger.warning("gnutls send failed")

1770

1506

return

1771

1507

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

1772

1508

sent, len(client.secret)

1775

1511

1776

1512

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

1777

1513

# bump the timeout using extended_timeout

1778

client.bump_timeout(client.extended_timeout)

1514

client.checked_ok(client.extended_timeout)

1779

1515

if self.server.use_dbus:

1780

1516

# Emit D-Bus signal

1781

1517

client.GotSecret()

1786

1522

try:

1787

1523

session.bye()

1788

1524

except gnutls.errors.GNUTLSError as error:

1789

logger.warning("GnuTLS bye failed",

1790

exc_info=error)

1525

logger.warning("GnuTLS bye failed")

1791

1526

1792

1527

@staticmethod

1793

1528

def peer_certificate(session):

1849

1584

# Convert the buffer to a Python bytestring

1850

1585

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

1851

1586

# Convert the bytestring to hexadecimal notation

1852

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

1587

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

1853

1588

return hex_fpr

1854

1589

1855

1590

1858

1593

def sub_process_main(self, request, address):

1859

1594

try:

1860

1595

self.finish_request(request, address)

1861

except Exception:

1596

except:

1862

1597

self.handle_error(request, address)

1863

1598

self.close_request(request)

1864

1599

1865

1600

def process_request(self, request, address):

1866

1601

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

1867

1602

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

1868

args = (request, address))

1603

args = (request,

1604

address))

1869

1605

proc.start()

1870

1606

return proc

1871

1607

1921

1657

str(self.interface

1922

1658

+ '\0'))

1923

1659

except socket.error as error:

1924

if error.errno == errno.EPERM:

1660

if error[0] == errno.EPERM:

1925

1661

logger.error("No permission to"

1926

1662

" bind to interface %s",

1927

1663

self.interface)

1928

elif error.errno == errno.ENOPROTOOPT:

1664

elif error[0] == errno.ENOPROTOOPT:

1929

1665

logger.error("SO_BINDTODEVICE not available;"

1930

1666

" cannot bind to interface %s",

1931

1667

self.interface)

1932

elif error.errno == errno.ENODEV:

1933

logger.error("Interface %s does not"

1934

" exist, cannot bind",

1935

self.interface)

1936

1668

else:

1937

1669

raise

1938

1670

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

1997

1729

1998

1730

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

1999

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)

2000

1746

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

2001

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

1747

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

2002

1748

# Wait for other process to exit

2003

1749

proc.join()

2004

1750

return False

2094

1840

elif suffix == "w":

2095

1841

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

2096

1842

else:

2097

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

2098

.format(suffix))

1843

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

2099

1844

except (ValueError, IndexError) as e:

2100

1845

raise ValueError(*(e.args))

2101

1846

timevalue += delta

2102

1847

return timevalue

2103

1848

2104

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

2105

1874

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

2106

1875

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

2107

1876

2115

1884

sys.exit()

2116

1885

if not noclose:

2117

1886

# Close all standard open file descriptors

2118

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

1887

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

2119

1888

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

2120

1889

raise OSError(errno.ENODEV,

2121

"{0} not a character device"

2122

.format(os.devnull))

1890

"%s not a character device"

1891

% os.path.devnull)

2123

1892

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

2124

1893

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

2125

1894

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

2134

1903

2135

1904

parser = argparse.ArgumentParser()

2136

1905

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

2137

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

1906

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

2138

1907

help="show version number and exit")

2139

1908

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

2140

1909

help="Bind to interface IF")

2163

1932

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

2164

1933

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

2165

1934

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

2166

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

2167

" state")

2168

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

2169

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

2170

1935

dest="restore",

1936

help="Do not restore stored state",

1937

default=True)

1938

2171

1939

options = parser.parse_args()

2172

1940

2173

1941

if options.check:

2186

1954

"use_dbus": "True",

2187

1955

"use_ipv6": "True",

2188

1956

"debuglevel": "",

2189

"restore": "True",

2190

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

2191

1957

}

2192

1958

2193

1959

# Parse config file for server-global settings

2210

1976

# options, if set.

2211

1977

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

2212

1978

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

2213

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

2214

"statedir"):

1979

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

2215

1980

value = getattr(options, option)

2216

1981

if value is not None:

2217

1982

server_settings[option] = value

2229

1994

debuglevel = server_settings["debuglevel"]

2230

1995

use_dbus = server_settings["use_dbus"]

2231

1996

use_ipv6 = server_settings["use_ipv6"]

2232

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

2233

stored_state_file)

2234

2235

if debug:

2236

initlogger(debug, logging.DEBUG)

2237

else:

2238

if not debuglevel:

2239

initlogger(debug)

2240

else:

2241

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

2242

initlogger(debug, level)

2243

1997

2244

1998

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

2245

1999

syslogger.setFormatter(logging.Formatter

2246

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

2247

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

2248

.format(server_settings

2249

["servicename"])))

2000

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

2001

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

2002

% server_settings["servicename"]))

2250

2003

2251

2004

# Parse config file with clients

2252

client_config = configparser.SafeConfigParser(Client

2253

.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)

2254

2014

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

2255

2015

"clients.conf"))

2256

2016

2270

2030

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

2271

2031

try:

2272

2032

pidfile = open(pidfilename, "w")

2273

except IOError as e:

2274

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

2275

exc_info=e)

2033

except IOError:

2034

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

2276

2035

2277

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:

2278

2040

try:

2279

uid = pwd.getpwnam(name).pw_uid

2280

gid = pwd.getpwnam(name).pw_gid

2281

break

2041

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

2042

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

2282

2043

except KeyError:

2283

continue

2284

else:

2285

uid = 65534

2286

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

2287

2050

try:

2288

2051

os.setgid(gid)

2289

2052

os.setuid(uid)

2290

2053

except OSError as error:

2291

if error.errno != errno.EPERM:

2054

if error[0] != errno.EPERM:

2292

2055

raise error

2293

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

2294

2063

if debug:

2064

logger.setLevel(logging.DEBUG)

2295

2065

# Enable all possible GnuTLS debugging

2296

2066

2297

2067

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

2306

2076

.gnutls_global_set_log_function(debug_gnutls))

2307

2077

2308

2078

# Redirect stdin so all checkers get /dev/null

2309

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

2079

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

2310

2080

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

2311

2081

if null > 2:

2312

2082

os.close(null)

2083

else:

2084

# No console logging

2085

logger.removeHandler(console)

2313

2086

2314

2087

# Need to fork before connecting to D-Bus

2315

2088

if not debug:

2316

2089

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

2317

2090

daemon()

2318

2091

2319

gobject.threads_init()

2320

2321

2092

global main_loop

2322

2093

# From the Avahi example code

2323

DBusGMainLoop(set_as_default=True)

2094

DBusGMainLoop(set_as_default=True )

2324

2095

main_loop = gobject.MainLoop()

2325

2096

bus = dbus.SystemBus()

2326

2097

# End of Avahi example code

2332

2103

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

2333

2104

do_not_queue=True))

2334

2105

except dbus.exceptions.NameExistsException as e:

2335

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

2106

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

2336

2107

use_dbus = False

2337

2108

server_settings["use_dbus"] = False

2338

2109

tcp_server.use_dbus = False

2350

2121

2351

2122

client_class = Client

2352

2123

if use_dbus:

2353

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

2354

2355

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

2356

2147

old_client_settings = {}

2357

clients_data = {}

2358

2359

# Get client data and settings from last running state.

2148

clients_data = []

2149

2150

# Get client data and settings from last running state.

2360

2151

if server_settings["restore"]:

2361

2152

try:

2362

2153

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

2363

clients_data, old_client_settings = (pickle.load

2364

(stored_state))

2154

clients_data, old_client_settings = (

2155

pickle.load(stored_state))

2365

2156

os.remove(stored_state_path)

2366

2157

except IOError as e:

2367

if e.errno == errno.ENOENT:

2368

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

2369

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

2370

else:

2371

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

2372

exc_info=e)

2158

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

2159

.format(e))

2160

if e.errno != errno.ENOENT:

2373

2161

raise

2374

except EOFError as e:

2375

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

2376

"EOFError:", exc_info=e)

2377

2378

with PGPEngine() as pgp:

2379

for client_name, client in clients_data.iteritems():

2380

# Decide which value to use after restoring saved state.

2381

# We have three different values: Old config file,

2382

# new config file, and saved state.

2383

# New config value takes precedence if it differs from old

2384

# config value, otherwise use saved state.

2385

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

2386

try:

2387

# For each value in new config, check if it

2388

# differs from the old config value (Except for

2389

# the "secret" attribute)

2390

if (name != "secret" and

2391

value != old_client_settings[client_name]

2392

[name]):

2393

client[name] = value

2394

except KeyError:

2395

pass

2396

2397

# Clients who has passed its expire date can still be

2398

# enabled if its last checker was successful. Clients

2399

# whose checker succeeded before we stored its state is

2400

# assumed to have successfully run all checkers during

2401

# downtime.

2402

if client["enabled"]:

2403

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

2404

if not client["last_checked_ok"]:

2405

logger.warning(

2406

"disabling client {0} - Client never "

2407

"performed a successful checker"

2408

.format(client_name))

2409

client["enabled"] = False

2410

elif client["last_checker_status"] != 0:

2411

logger.warning(

2412

"disabling client {0} - Client "

2413

"last checker failed with error code {1}"

2414

.format(client_name,

2415

client["last_checker_status"]))

2416

client["enabled"] = False

2417

else:

2418

client["expires"] = (datetime.datetime

2419

.utcnow()

2420

+ client["timeout"])

2421

logger.debug("Last checker succeeded,"

2422

" keeping {0} enabled"

2423

.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():

2424

2172

try:

2425

client["secret"] = (

2426

pgp.decrypt(client["encrypted_secret"],

2427

client_settings[client_name]

2428

["secret"]))

2429

except PGPError:

2430

# If decryption fails, we use secret from new settings

2431

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

2432

.format(client_name))

2433

client["secret"] = (

2434

client_settings[client_name]["secret"])

2435

2436

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

2437

for client_name in (set(old_client_settings)

2438

- set(client_settings)):

2439

del clients_data[client_name]

2440

for client_name in (set(client_settings)

2441

- set(old_client_settings)):

2442

clients_data[client_name] = client_settings[client_name]

2443

2444

# Create all client objects

2445

for client_name, client in clients_data.iteritems():

2446

tcp_server.clients[client_name] = client_class(

2447

name = client_name, settings = client)

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])

2448

2224

2449

2225

if not tcp_server.clients:

2450

2226

logger.warning("No clients defined")

2451

2227

2452

2228

if not debug:

2453

2229

try:

2454

2230

with pidfile:

2462

2238

# "pidfile" was never created

2463

2239

pass

2464

2240

del pidfilename

2241

2242

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

2465

2243

2466

2244

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

2467

2245

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

2468

2246

2469

2247

if use_dbus:

2470

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

2471

"se.bsnet.fukt.Mandos"})

2472

class MandosDBusService(DBusObjectWithProperties):

2248

class MandosDBusService(dbus.service.Object):

2473

2249

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

2474

2250

def __init__(self):

2475

2251

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

2476

2252

_interface = "se.recompile.Mandos"

2477

2253

2478

@dbus_interface_annotations(_interface)

2479

def _foo(self):

2480

return { "org.freedesktop.DBus.Property"

2481

".EmitsChangedSignal":

2482

"false"}

2483

2484

2254

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

2485

2255

def ClientAdded(self, objpath):

2486

2256

"D-Bus signal"

2528

2298

2529

2299

del _interface

2530

2300

2531

mandos_dbus_service = MandosDBusService()

2301

class MandosDBusServiceTransitional(MandosDBusService):

2302

__metaclass__ = AlternateDBusNamesMetaclass

2303

mandos_dbus_service = MandosDBusServiceTransitional()

2532

2304

2533

2305

def cleanup():

2534

2306

"Cleanup function; run on exit"

2537

2309

multiprocessing.active_children()

2538

2310

if not (tcp_server.clients or client_settings):

2539

2311

return

2540

2312

2541

2313

# Store client before exiting. Secrets are encrypted with key

2542

2314

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

2543

2315

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

2544

clients = {}

2545

with PGPEngine() as pgp:

2546

for client in tcp_server.clients.itervalues():

2547

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

2548

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

2549

key)

2550

client_dict = {}

2551

2552

# A list of attributes that can not be pickled

2553

# + secret.

2554

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

2555

"checker"))

2556

for name, typ in (inspect.getmembers

2557

(dbus.service.Object)):

2558

exclude.add(name)

2559

2560

client_dict["encrypted_secret"] = (client

2561

.encrypted_secret)

2562

for attr in client.client_structure:

2563

if attr not in exclude:

2564

client_dict[attr] = getattr(client, attr)

2565

2566

clients[client.name] = client_dict

2567

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

2568

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

2569

2337

try:

2570

with (tempfile.NamedTemporaryFile

2571

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

2572

dir=os.path.dirname(stored_state_path),

2573

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:

2574

2342

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

2575

tempname=stored_state.name

2576

os.rename(tempname, stored_state_path)

2577

except (IOError, OSError) as e:

2578

if not debug:

2579

try:

2580

os.remove(tempname)

2581

except NameError:

2582

pass

2583

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

2584

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

2585

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

2586

else:

2587

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

2588

exc_info=e)

2589

raise e

2590

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

2591

2349

# Delete all clients, and settings from config

2592

2350

while tcp_server.clients:

2593

2351

name, client = tcp_server.clients.popitem()

2611

2369

# Need to initiate checking of clients

2612

2370

if client.enabled:

2613

2371

client.init_checker()

2372

2614

2373

2615

2374

tcp_server.enable()

2616

2375

tcp_server.server_activate()

2619

2378

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

2620

2379

if use_ipv6:

2621

2380

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

2622

" flowinfo %d, scope_id %d",

2623

*tcp_server.socket.getsockname())

2381

" flowinfo %d, scope_id %d"

2382

% tcp_server.socket.getsockname())

2624

2383

else: # IPv4

2625

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

2626

*tcp_server.socket.getsockname())

2384

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

2385

% tcp_server.socket.getsockname())

2627

2386

2628

2387

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

2629

2388

2632

2391

try:

2633

2392

service.activate()

2634

2393

except dbus.exceptions.DBusException as error:

2635

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

2394

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

2636

2395

cleanup()

2637

2396

sys.exit(1)

2638

2397

# End of Avahi example code

2645

2404

logger.debug("Starting main loop")

2646

2405

main_loop.run()

2647

2406

except AvahiError as error:

2648

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

2407

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

2649

2408

cleanup()

2650

2409

sys.exit(1)

2651

2410

except KeyboardInterrupt:

2656

2415

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

2657

2416

cleanup()

2658

2417

2418

2659

2419

if __name__ == '__main__':

2660

2420

main()