/mandos/trunk : revision 585

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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 hashlib

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import binascii

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import tempfile

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import itertools

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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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import GnuPGInterface

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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 = "1.4.1"

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version = "1.5.3"

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stored_state_file = "clients.pickle"

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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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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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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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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("DBusException: %s", error)

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logger.critical("D-Bus Exception", exc_info=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: %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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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) as e:

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dbus.exceptions.DBusException):

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

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

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% self.name))

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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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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 reflect crashed

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checker, or None.

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last_enabled: datetime.datetime(); (UTC)

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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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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 password has been sent

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extended_timeout: extra long timeout when secret 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", "fingerprint",

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

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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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"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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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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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):

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self.name = name

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if config is None:

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config = {}

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# adding all client settings

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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)

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else:

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self.last_enabled = None

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self.expires = None

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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

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

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.replace(" ", ""))

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

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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", "")

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self.created = datetime.datetime.utcnow()

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self.enabled = True

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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.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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self.checker = None

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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_by_default = config.get("approved_by_default",

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True)

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self.approved = None

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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

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.Condition(multiprocessing_manager

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.Lock()))

401

self.client_structure = [attr for attr

402

in self.__dict__.iterkeys()

557

self.client_structure = [attr for attr in

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self.__dict__.iterkeys()

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if not attr.startswith("_")]

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560

self.client_structure.append("client_structure")

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

408

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lambda obj:

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isinstance(obj,

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

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577

# Already enabled

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return

424

self.send_changedstate()

425

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

426

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self.enabled = True

427

581

self.last_enabled = datetime.datetime.utcnow()

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self.init_checker()

583

self.send_changedstate()

429

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430

585

def disable(self, quiet=True):

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586

"""Disable this client."""

432

587

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

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588

return False

434

589

if not quiet:

435

self.send_changedstate()

436

if not quiet:

437

590

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

438

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

591

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

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592

gobject.source_remove(self.disable_initiator_tag)

440

593

self.disable_initiator_tag = None

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594

self.expires = None

442

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

595

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

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gobject.source_remove(self.checker_initiator_tag)

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self.checker_initiator_tag = None

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598

self.stop_checker()

446

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self.enabled = False

600

if not quiet:

601

self.send_changedstate()

447

602

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

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603

return False

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604

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605

def __del__(self):

451

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self.disable()

452

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def init_checker(self):

454

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

455

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# and every interval from then on.

611

if self.checker_initiator_tag is not None:

612

gobject.source_remove(self.checker_initiator_tag)

456

613

self.checker_initiator_tag = (gobject.timeout_add

457

614

(self.interval_milliseconds(),

458

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self.start_checker))

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

617

if self.disable_initiator_tag is not None:

618

gobject.source_remove(self.disable_initiator_tag)

460

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self.disable_initiator_tag = (gobject.timeout_add

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(self.timeout_milliseconds(),

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self.disable))

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# Also start a new checker *right now*.

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self.start_checker()

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

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

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self.checker_callback_tag = None

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self.checker = None

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629

if os.WIFEXITED(condition):

472

self.last_checker_status = os.WEXITSTATUS(condition)

630

self.last_checker_status = os.WEXITSTATUS(condition)

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631

if self.last_checker_status == 0:

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632

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

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vars(self))

482

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

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vars(self))

484

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def checked_ok(self, timeout=None):

486

"""Bump up the timeout for this client.

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

489

alive and well.

490

"""

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."""

491

651

if timeout is None:

492

652

timeout = self.timeout

493

self.last_checked_ok = datetime.datetime.utcnow()

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653

if self.disable_initiator_tag is not None:

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654

gobject.source_remove(self.disable_initiator_tag)

655

self.disable_initiator_tag = None

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656

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

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657

self.disable_initiator_tag = (gobject.timeout_add

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(_timedelta_to_milliseconds

658

(timedelta_to_milliseconds

499

659

(timeout), self.disable))

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

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661

508

668

If a checker already exists, leave it running and do

509

669

nothing."""

510

670

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

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

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

515

675

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

516

676

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

517

677

# should be.

531

691

self.current_checker_command)

532

692

# Start a new checker if needed

533

693

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)

534

699

try:

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

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

553

705

self.current_checker_command = command

554

706

try:

555

707

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

561

713

self.checker = subprocess.Popen(command,

562

714

close_fds=True,

563

715

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)

574

716

except OSError as error:

575

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

576

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)

577

729

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

578

730

return True

579

731

586

738

return

587

739

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

588

740

try:

589

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

741

self.checker.terminate()

590

742

#time.sleep(0.5)

591

743

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

592

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

744

# self.checker.kill()

593

745

except OSError as error:

594

746

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

595

747

raise

596

748

self.checker = None

597

749

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

648

750

649

751

def dbus_service_property(dbus_interface, signature="v",

650

752

access="readwrite", byte_arrays=False):

662

764

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

663

765

if byte_arrays and signature != "ay":

664

766

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

665

" signature %r" % signature)

767

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

666

768

def decorator(func):

667

769

func._dbus_is_property = True

668

770

func._dbus_interface = dbus_interface

676

778

return decorator

677

779

678

780

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

679

818

class DBusPropertyException(dbus.exceptions.DBusException):

680

819

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

681

820

"""

704

843

"""

705

844

706

845

@staticmethod

707

def _is_dbus_property(obj):

708

return getattr(obj, "_dbus_is_property", False)

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)

709

854

710

def _get_all_dbus_properties(self):

855

def _get_all_dbus_things(self, thing):

711

856

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

712

857

"""

713

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

858

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

859

name),

860

athing.__get__(self))

714

861

for cls in self.__class__.__mro__

715

for name, prop in

716

inspect.getmembers(cls, self._is_dbus_property))

862

for name, athing in

863

inspect.getmembers(cls,

864

self._is_dbus_thing(thing)))

717

865

718

866

def _get_dbus_property(self, interface_name, property_name):

719

867

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

721

869

"""

722

870

for cls in self.__class__.__mro__:

723

871

for name, value in (inspect.getmembers

724

(cls, self._is_dbus_property)):

872

(cls,

873

self._is_dbus_thing("property"))):

725

874

if (value._dbus_name == property_name

726

875

and value._dbus_interface == interface_name):

727

876

return value.__get__(self)

756

905

# signatures other than "ay".

757

906

if prop._dbus_signature != "ay":

758

907

raise ValueError

759

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

760

for byte in value))

908

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

909

for byte in value))

761

910

prop(value)

762

911

763

912

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

768

917

769

918

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

770

919

"""

771

all = {}

772

for name, prop in self._get_all_dbus_properties():

920

properties = {}

921

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

773

922

if (interface_name

774

923

and interface_name != prop._dbus_interface):

775

924

# Interface non-empty but did not match

779

928

continue

780

929

value = prop()

781

930

if not hasattr(value, "variant_level"):

782

all[name] = value

931

properties[name] = value

783

932

continue

784

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

785

value.variant_level+1)

786

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

933

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

934

value.variant_level+1)

935

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

787

936

788

937

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

789

938

out_signature="s",

790

939

path_keyword='object_path',

791

940

connection_keyword='connection')

792

941

def Introspect(self, object_path, connection):

793

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

942

"""Overloading of standard D-Bus method.

943

944

Inserts property tags and interface annotation tags.

794

945

"""

795

946

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

796

947

connection)

803

954

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

804

955

return e

805

956

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

957

# Add property tags

806

958

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

807

959

for name, prop

808

in self._get_all_dbus_properties()

960

in self._get_all_dbus_things("property")

809

961

if prop._dbus_interface

810

962

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

811

963

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)

812

995

# Add the names to the return values for the

813

996

# "org.freedesktop.DBus.Properties" methods

814

997

if (if_tag.getAttribute("name")

829

1012

except (AttributeError, xml.dom.DOMException,

830

1013

xml.parsers.expat.ExpatError) as error:

831

1014

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

832

error)

1015

exc_info=error)

833

1016

return xmlstring

834

1017

835

1018

840

1023

return dbus.String(dt.isoformat(),

841

1024

variant_level=variant_level)

842

1025

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.

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).

847

1049

"""

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):

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):

855

1057

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

856

1058

# with the wrong interface name

857

1059

if (not hasattr(attribute, "_dbus_interface")

858

1060

or not attribute._dbus_interface

859

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

1061

.startswith(orig_interface_name)):

860

1062

continue

861

1063

# Create an alternate D-Bus interface name based on

862

1064

# the current name

863

1065

alt_interface = (attribute._dbus_interface

864

.replace("se.recompile.Mandos",

865

"se.bsnet.fukt.Mandos"))

1066

.replace(orig_interface_name,

1067

alt_interface_name))

1068

interface_names.add(alt_interface)

866

1069

# Is this a D-Bus signal?

867

1070

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

868

1071

# Extract the original non-method function by

883

1086

nonmethod_func.func_name,

884

1087

nonmethod_func.func_defaults,

885

1088

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

886

1095

# Define a creator of a function to call both the

887

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

888

# signals gets sent when the function is called

1096

# original and alternate functions, so both the

1097

# original and alternate signals gets sent when

1098

# the function is called

889

1099

def fixscope(func1, func2):

890

1100

"""This function is a scope container to pass

891

1101

func1 and func2 to the "call_both" function

898

1108

return call_both

899

1109

# Create the "call_both" function and add it to

900

1110

# the class

901

attr[attrname] = fixscope(attribute,

902

new_function)

1111

attr[attrname] = fixscope(attribute, new_function)

903

1112

# Is this a D-Bus method?

904

1113

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

905

1114

# Create a new, but exactly alike, function

916

1125

attribute.func_name,

917

1126

attribute.func_defaults,

918

1127

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

919

1134

# Is this a D-Bus property?

920

1135

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

921

1136

# Create a new, but exactly alike, function

935

1150

attribute.func_name,

936

1151

attribute.func_defaults,

937

1152

attribute.func_closure)))

938

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

939

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"})

940

1198

class ClientDBus(Client, DBusObjectWithProperties):

941

1199

"""A Client class using D-Bus

942

1200

952

1210

953

1211

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

954

1212

self.bus = bus

955

self._approvals_pending = 0

956

1213

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

957

self.add_to_dbus()

958

959

def add_to_dbus(self):

960

1214

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

961

1215

# the D-Bus

962

1216

client_object_name = unicode(self.name).translate(

966

1220

("/clients/" + client_object_name))

967

1221

DBusObjectWithProperties.__init__(self, self.bus,

968

1222

self.dbus_object_path)

969

1223

970

1224

def notifychangeproperty(transform_func,

971

1225

dbus_name, type_func=lambda x: x,

972

1226

variant_level=1):

973

1227

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

974

1228

its changes to DBus.

975

1229

976

1230

transform_fun: Function that takes a value and a variant_level

977

1231

and transforms it to a D-Bus type.

978

1232

dbus_name: D-Bus name of the variable

995

1249

996

1250

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

997

1251

998

999

1252

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1000

1253

approvals_pending = notifychangeproperty(dbus.Boolean,

1001

1254

"ApprovalPending",

1008

1261

checker is not None)

1009

1262

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1010

1263

"LastCheckedOK")

1264

last_checker_status = notifychangeproperty(dbus.Int16,

1265

"LastCheckerStatus")

1011

1266

last_approval_request = notifychangeproperty(

1012

1267

datetime_to_dbus, "LastApprovalRequest")

1013

1268

approved_by_default = notifychangeproperty(dbus.Boolean,

1014

1269

"ApprovedByDefault")

1015

approval_delay = notifychangeproperty(dbus.UInt16,

1270

approval_delay = notifychangeproperty(dbus.UInt64,

1016

1271

"ApprovalDelay",

1017

1272

type_func =

1018

_timedelta_to_milliseconds)

1273

timedelta_to_milliseconds)

1019

1274

approval_duration = notifychangeproperty(

1020

dbus.UInt16, "ApprovalDuration",

1021

type_func = _timedelta_to_milliseconds)

1275

dbus.UInt64, "ApprovalDuration",

1276

type_func = timedelta_to_milliseconds)

1022

1277

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

1023

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

1278

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

1024

1279

type_func =

1025

_timedelta_to_milliseconds)

1280

timedelta_to_milliseconds)

1026

1281

extended_timeout = notifychangeproperty(

1027

dbus.UInt16, "ExtendedTimeout",

1028

type_func = _timedelta_to_milliseconds)

1029

interval = notifychangeproperty(dbus.UInt16,

1282

dbus.UInt64, "ExtendedTimeout",

1283

type_func = timedelta_to_milliseconds)

1284

interval = notifychangeproperty(dbus.UInt64,

1030

1285

"Interval",

1031

1286

type_func =

1032

_timedelta_to_milliseconds)

1287

timedelta_to_milliseconds)

1033

1288

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

1034

1289

1035

1290

del notifychangeproperty

1077

1332

return r

1078

1333

1079

1334

def _reset_approved(self):

1080

self._approved = None

1335

self.approved = None

1081

1336

return False

1082

1337

1083

1338

def approve(self, value=True):

1084

self.send_changedstate()

1085

self._approved = value

1086

gobject.timeout_add(_timedelta_to_milliseconds

1339

self.approved = value

1340

gobject.timeout_add(timedelta_to_milliseconds

1087

1341

(self.approval_duration),

1088

1342

self._reset_approved)

1089

1343

self.send_changedstate()

1090

1344

1091

1345

## D-Bus methods, signals & properties

1092

1346

_interface = "se.recompile.Mandos.Client"

1093

1347

1348

## Interfaces

1349

1350

@dbus_interface_annotations(_interface)

1351

def _foo(self):

1352

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

1353

"false"}

1354

1094

1355

## Signals

1095

1356

1096

1357

# CheckerCompleted - signal

1195

1456

access="readwrite")

1196

1457

def ApprovalDuration_dbus_property(self, value=None):

1197

1458

if value is None: # get

1198

return dbus.UInt64(_timedelta_to_milliseconds(

1459

return dbus.UInt64(timedelta_to_milliseconds(

1199

1460

self.approval_duration))

1200

1461

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

1201

1462

1215

1476

def Host_dbus_property(self, value=None):

1216

1477

if value is None: # get

1217

1478

return dbus.String(self.host)

1218

self.host = value

1479

self.host = unicode(value)

1219

1480

1220

1481

# Created - property

1221

1482

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

1222

1483

def Created_dbus_property(self):

1223

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

1484

return datetime_to_dbus(self.created)

1224

1485

1225

1486

# LastEnabled - property

1226

1487

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

1247

1508

return

1248

1509

return datetime_to_dbus(self.last_checked_ok)

1249

1510

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

1250

1517

# Expires - property

1251

1518

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

1252

1519

def Expires_dbus_property(self):

1263

1530

def Timeout_dbus_property(self, value=None):

1264

1531

if value is None: # get

1265

1532

return dbus.UInt64(self.timeout_milliseconds())

1533

old_timeout = self.timeout

1266

1534

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

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))

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))

1287

1551

1288

1552

# ExtendedTimeout - property

1289

1553

@dbus_service_property(_interface, signature="t",

1302

1566

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

1303

1567

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

1304

1568

return

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

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

1310

1575

1311

1576

# Checker - property

1312

1577

@dbus_service_property(_interface, signature="s",

1314

1579

def Checker_dbus_property(self, value=None):

1315

1580

if value is None: # get

1316

1581

return dbus.String(self.checker_command)

1317

self.checker_command = value

1582

self.checker_command = unicode(value)

1318

1583

1319

1584

# CheckerRunning - property

1320

1585

@dbus_service_property(_interface, signature="b",

1349

1614

raise KeyError()

1350

1615

1351

1616

def __getattribute__(self, name):

1352

if(name == '_pipe'):

1617

if name == '_pipe':

1353

1618

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

1354

1619

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

1355

1620

data = self._pipe.recv()

1362

1627

return func

1363

1628

1364

1629

def __setattr__(self, name, value):

1365

if(name == '_pipe'):

1630

if name == '_pipe':

1366

1631

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

1367

1632

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

1368

1633

1369

class ClientDBusTransitional(ClientDBus):

1370

__metaclass__ = AlternateDBusNamesMetaclass

1371

1634

1372

1635

class ClientHandler(socketserver.BaseRequestHandler, object):

1373

1636

"""A class to handle client connections.

1456

1719

client.Rejected("Disabled")

1457

1720

return

1458

1721

1459

if client._approved or not client.approval_delay:

1722

if client.approved or not client.approval_delay:

1460

1723

#We are approved or approval is disabled

1461

1724

break

1462

elif client._approved is None:

1725

elif client.approved is None:

1463

1726

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

1464

1727

client.name)

1465

1728

if self.server.use_dbus:

1478

1741

#wait until timeout or approved

1479

1742

time = datetime.datetime.now()

1480

1743

client.changedstate.acquire()

1481

(client.changedstate.wait

1482

(float(client._timedelta_to_milliseconds(delay)

1483

/ 1000)))

1744

client.changedstate.wait(

1745

float(timedelta_to_milliseconds(delay)

1746

/ 1000))

1484

1747

client.changedstate.release()

1485

1748

time2 = datetime.datetime.now()

1486

1749

if (time2 - time) >= delay:

1502

1765

try:

1503

1766

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

1504

1767

except gnutls.errors.GNUTLSError as error:

1505

logger.warning("gnutls send failed")

1768

logger.warning("gnutls send failed",

1769

exc_info=error)

1506

1770

return

1507

1771

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

1508

1772

sent, len(client.secret)

1511

1775

1512

1776

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

1513

1777

# bump the timeout using extended_timeout

1514

client.checked_ok(client.extended_timeout)

1778

client.bump_timeout(client.extended_timeout)

1515

1779

if self.server.use_dbus:

1516

1780

# Emit D-Bus signal

1517

1781

client.GotSecret()

1522

1786

try:

1523

1787

session.bye()

1524

1788

except gnutls.errors.GNUTLSError as error:

1525

logger.warning("GnuTLS bye failed")

1789

logger.warning("GnuTLS bye failed",

1790

exc_info=error)

1526

1791

1527

1792

@staticmethod

1528

1793

def peer_certificate(session):

1584

1849

# Convert the buffer to a Python bytestring

1585

1850

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

1586

1851

# Convert the bytestring to hexadecimal notation

1587

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

1852

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

1588

1853

return hex_fpr

1589

1854

1590

1855

1593

1858

def sub_process_main(self, request, address):

1594

1859

try:

1595

1860

self.finish_request(request, address)

1596

except:

1861

except Exception:

1597

1862

self.handle_error(request, address)

1598

1863

self.close_request(request)

1599

1864

1600

1865

def process_request(self, request, address):

1601

1866

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

1602

1867

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

1603

args = (request,

1604

address))

1868

args = (request, address))

1605

1869

proc.start()

1606

1870

return proc

1607

1871

1657

1921

str(self.interface

1658

1922

+ '\0'))

1659

1923

except socket.error as error:

1660

if error[0] == errno.EPERM:

1924

if error.errno == errno.EPERM:

1661

1925

logger.error("No permission to"

1662

1926

" bind to interface %s",

1663

1927

self.interface)

1664

elif error[0] == errno.ENOPROTOOPT:

1928

elif error.errno == errno.ENOPROTOOPT:

1665

1929

logger.error("SO_BINDTODEVICE not available;"

1666

1930

" cannot bind to interface %s",

1667

1931

self.interface)

1932

elif error.errno == errno.ENODEV:

1933

logger.error("Interface %s does not"

1934

" exist, cannot bind",

1935

self.interface)

1668

1936

else:

1669

1937

raise

1670

1938

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

1729

1997

1730

1998

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

1731

1999

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)

1746

2000

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

1747

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

2001

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

1748

2002

# Wait for other process to exit

1749

2003

proc.join()

1750

2004

return False

1840

2094

elif suffix == "w":

1841

2095

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

1842

2096

else:

1843

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

2097

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

2098

.format(suffix))

1844

2099

except (ValueError, IndexError) as e:

1845

2100

raise ValueError(*(e.args))

1846

2101

timevalue += delta

1847

2102

return timevalue

1848

2103

1849

2104

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

1874

2105

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

1875

2106

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

1876

2107

1884

2115

sys.exit()

1885

2116

if not noclose:

1886

2117

# Close all standard open file descriptors

1887

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

2118

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

1888

2119

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

1889

2120

raise OSError(errno.ENODEV,

1890

"%s not a character device"

1891

% os.path.devnull)

2121

"{0} not a character device"

2122

.format(os.devnull))

1892

2123

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

1893

2124

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

1894

2125

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

1903

2134

1904

2135

parser = argparse.ArgumentParser()

1905

2136

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

1906

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

2137

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

1907

2138

help="show version number and exit")

1908

2139

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

1909

2140

help="Bind to interface IF")

1932

2163

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

1933

2164

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

1934

2165

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

1935

dest="restore",

1936

help="Do not restore stored state",

1937

default=True)

1938

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

1939

2171

options = parser.parse_args()

1940

2172

1941

2173

if options.check:

1954

2186

"use_dbus": "True",

1955

2187

"use_ipv6": "True",

1956

2188

"debuglevel": "",

2189

"restore": "True",

2190

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

1957

2191

}

1958

2192

1959

2193

# Parse config file for server-global settings

1976

2210

# options, if set.

1977

2211

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

1978

2212

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

1979

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

2213

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

2214

"statedir"):

1980

2215

value = getattr(options, option)

1981

2216

if value is not None:

1982

2217

server_settings[option] = value

1994

2229

debuglevel = server_settings["debuglevel"]

1995

2230

use_dbus = server_settings["use_dbus"]

1996

2231

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)

1997

2243

1998

2244

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

1999

2245

syslogger.setFormatter(logging.Formatter

2000

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

2001

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

2002

% server_settings["servicename"]))

2246

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

2247

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

2248

.format(server_settings

2249

["servicename"])))

2003

2250

2004

2251

# Parse config file with clients

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)

2252

client_config = configparser.SafeConfigParser(Client

2253

.client_defaults)

2014

2254

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

2015

2255

"clients.conf"))

2016

2256

2030

2270

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

2031

2271

try:

2032

2272

pidfile = open(pidfilename, "w")

2033

except IOError:

2034

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

2273

except IOError as e:

2274

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

2275

exc_info=e)

2035

2276

2036

try:

2037

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

2038

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

2039

except KeyError:

2277

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

2040

2278

try:

2041

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

2042

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

2279

uid = pwd.getpwnam(name).pw_uid

2280

gid = pwd.getpwnam(name).pw_gid

2281

break

2043

2282

except KeyError:

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

2283

continue

2284

else:

2285

uid = 65534

2286

gid = 65534

2050

2287

try:

2051

2288

os.setgid(gid)

2052

2289

os.setuid(uid)

2053

2290

except OSError as error:

2054

if error[0] != errno.EPERM:

2291

if error.errno != errno.EPERM:

2055

2292

raise error

2056

2293

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

2063

2294

if debug:

2064

logger.setLevel(logging.DEBUG)

2065

2295

# Enable all possible GnuTLS debugging

2066

2296

2067

2297

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

2076

2306

.gnutls_global_set_log_function(debug_gnutls))

2077

2307

2078

2308

# Redirect stdin so all checkers get /dev/null

2079

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

2309

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

2080

2310

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

2081

2311

if null > 2:

2082

2312

os.close(null)

2083

else:

2084

# No console logging

2085

logger.removeHandler(console)

2086

2313

2087

2314

# Need to fork before connecting to D-Bus

2088

2315

if not debug:

2089

2316

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

2090

2317

daemon()

2091

2318

2319

gobject.threads_init()

2320

2092

2321

global main_loop

2093

2322

# From the Avahi example code

2094

DBusGMainLoop(set_as_default=True )

2323

DBusGMainLoop(set_as_default=True)

2095

2324

main_loop = gobject.MainLoop()

2096

2325

bus = dbus.SystemBus()

2097

2326

# End of Avahi example code

2103

2332

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

2104

2333

do_not_queue=True))

2105

2334

except dbus.exceptions.NameExistsException as e:

2106

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

2335

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

2107

2336

use_dbus = False

2108

2337

server_settings["use_dbus"] = False

2109

2338

tcp_server.use_dbus = False

2121

2350

2122

2351

client_class = Client

2123

2352

if use_dbus:

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

2353

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

2354

2355

client_settings = Client.config_parser(client_config)

2147

2356

old_client_settings = {}

2148

clients_data = []

2149

2150

# Get client data and settings from last running state.

2357

clients_data = {}

2358

2359

# Get client data and settings from last running state.

2151

2360

if server_settings["restore"]:

2152

2361

try:

2153

2362

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

2154

clients_data, old_client_settings = (

2155

pickle.load(stored_state))

2363

clients_data, old_client_settings = (pickle.load

2364

(stored_state))

2156

2365

os.remove(stored_state_path)

2157

2366

except IOError as e:

2158

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

2159

.format(e))

2160

if e.errno != errno.ENOENT:

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)

2161

2373

raise

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():

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))

2172

2424

try:

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])

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)

2224

2448

2225

2449

if not tcp_server.clients:

2226

2450

logger.warning("No clients defined")

2227

2451

2228

2452

if not debug:

2229

2453

try:

2230

2454

with pidfile:

2238

2462

# "pidfile" was never created

2239

2463

pass

2240

2464

del pidfilename

2241

2242

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

2243

2465

2244

2466

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

2245

2467

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

2246

2468

2247

2469

if use_dbus:

2248

class MandosDBusService(dbus.service.Object):

2470

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

2471

"se.bsnet.fukt.Mandos"})

2472

class MandosDBusService(DBusObjectWithProperties):

2249

2473

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

2250

2474

def __init__(self):

2251

2475

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

2252

2476

_interface = "se.recompile.Mandos"

2253

2477

2478

@dbus_interface_annotations(_interface)

2479

def _foo(self):

2480

return { "org.freedesktop.DBus.Property"

2481

".EmitsChangedSignal":

2482

"false"}

2483

2254

2484

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

2255

2485

def ClientAdded(self, objpath):

2256

2486

"D-Bus signal"

2298

2528

2299

2529

del _interface

2300

2530

2301

class MandosDBusServiceTransitional(MandosDBusService):

2302

__metaclass__ = AlternateDBusNamesMetaclass

2303

mandos_dbus_service = MandosDBusServiceTransitional()

2531

mandos_dbus_service = MandosDBusService()

2304

2532

2305

2533

def cleanup():

2306

2534

"Cleanup function; run on exit"

2309

2537

multiprocessing.active_children()

2310

2538

if not (tcp_server.clients or client_settings):

2311

2539

return

2312

2540

2313

2541

# Store client before exiting. Secrets are encrypted with key

2314

2542

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

2315

2543

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

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

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

2337

2569

try:

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:

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:

2342

2574

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

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

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

2349

2591

# Delete all clients, and settings from config

2350

2592

while tcp_server.clients:

2351

2593

name, client = tcp_server.clients.popitem()

2369

2611

# Need to initiate checking of clients

2370

2612

if client.enabled:

2371

2613

client.init_checker()

2372

2373

2614

2374

2615

tcp_server.enable()

2375

2616

tcp_server.server_activate()

2378

2619

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

2379

2620

if use_ipv6:

2380

2621

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

2381

" flowinfo %d, scope_id %d"

2382

% tcp_server.socket.getsockname())

2622

" flowinfo %d, scope_id %d",

2623

*tcp_server.socket.getsockname())

2383

2624

else: # IPv4

2384

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

2385

% tcp_server.socket.getsockname())

2625

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

2626

*tcp_server.socket.getsockname())

2386

2627

2387

2628

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

2388

2629

2391

2632

try:

2392

2633

service.activate()

2393

2634

except dbus.exceptions.DBusException as error:

2394

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

2635

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

2395

2636

cleanup()

2396

2637

sys.exit(1)

2397

2638

# End of Avahi example code

2404

2645

logger.debug("Starting main loop")

2405

2646

main_loop.run()

2406

2647

except AvahiError as error:

2407

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

2648

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

2408

2649

cleanup()

2409

2650

sys.exit(1)

2410

2651

except KeyboardInterrupt:

2415

2656

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

2416

2657

cleanup()

2417

2658

2418

2419

2659

if __name__ == '__main__':

2420

2660

main()